17 files changed, 1919 insertions, 242 deletions

diff --git a/Dockerfile b/Dockerfile
index a436239..f46b3a1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 FROM node:13-alpine
 WORKDIR /app
+RUN apk add --no-cache python3 build-base
 ADD package.json package-lock.json /app/
 RUN npm install
 COPY . /app/
diff --git a/FEDERATION.md b/FEDERATION.md
new file mode 100644
index 0000000..fde2d2d
--- /dev/null
+++ b/FEDERATION.md
@@ -0,0 +1,157 @@
+# Federation
+
+This document is meant to be a reference for all the ActivityPub federation-related behavior that gath.io has. This means: every user action that can trigger an Activity, every Object that is created and sent out and/or stored.
+
+## Documentation conventions
+
+To keep things simple, sometimes you will see things formatted like `Create/Note` or `Delete/Event` or `Undo/Follow`. The thing before the slash is the Activity, and the thing after the slash is the Object inside the Activity, in an `object` property. So these are to be read as follows:
+
+* `Create/Note`: a `Create` activity containing a `Note` in the `object` field 
+* `Delete/Event`: a `Delete` activity containing an `Event` in the `object` field
+* `Undo/Follow`: an `Undo` activity containing a `Follow` in the `object` field
+
+When the word "broadcast" is used in this document, it means to send an Activity to individual inbox of each of the followers of a given Actor.
+
+This document has four main sections:
+
+* __Federation philosophy__ lays out the general model of how this is intended to federate
+* __General Actor information__ contains the basics of what to expect from our `Actor` objects
+* __Inbox behavior__ lists every incoming ActivityPub activity that the server recognizes, and tells you what it does in response to that activity, including any other ActivityPub activities it sends back out.
+* __Activities triggered from the web app__ tells you what circumstances on the web application cause the server to emit ActivityPub activities. (For example, when an event is updated via the web application, it lets all the ActivityPub followers know that the event has been updated.)
+
+Please note: there is an unfortunate collision between the English language and the ActivityPub spec that can make this document confusing. When this document uses the word 'event' with a lowercase-e and not in monospace, it refers to the thing that is being tracked in gathio: events that are being organized. When this document uses the word `Event` with a capital E and in monospace, it refers to the [`Event` object defined in the ActivityStreams Vocabulary spec](https://www.w3.org/TR/activitystreams-vocabulary/#dfn-event).
+
+## Federation philosophy
+
+The first-class Actor in gathio is an event. So every time an event organizer creates a page for a new event, there is a new, followable Actor on the fediverse. The idea is that humans want to follow events and get updates on important changes to the events.
+
+This differs from other ActivityPub-compatible software I've seen, which considers _people_ first class, and you follow an Actor representing a person and then you get updates on all their events. I think that is silly, and I like my model better. From my perspective, the accounts of _people_ should live on people-focused services like Mastodon/Pleroma/Friendica/etc. This service is for events, and thus events are its first-class Actor.
+
+Also, gathio prides itself on deleting ALL data related to an event 7 days after the event is over. So we don't retain old messages once an event is deleted, and events are meant to be represented by Actors that only exist for the duration of the event plus 7 days. This is handled via thorough `Delete` messaging.
+
+The point of federating this is so that people can simply follow an event and get all the updates they care about, and even RSVP to and comment on the event directly from their ActivityPub client. This is all without signing up or anything on gathio.
+
+## General Actor information
+
+Every event has an Actor. The Actor looks like this:
+
+```json
+{
+  "@context":[
+    "https://www.w3.org/ns/activitystreams",
+    "https://w3id.org/security/v1"
+  ],
+  "id": "https://DOMAIN/EVENTID",
+  "type": "Person",
+  "preferredUsername": "EVENTID",
+  "inbox": "https://DOMAIN/activitypub/inbox",
+  "outbox": "https://DOMAIN/EVENTID/outbox",
+  "followers": "https://DOMAIN/EVENTID/followers",
+  "summary": "<p><p>DESCRIPTION</p>\n</p><p>Location: LOCATION.</p><p>Starting DATETIME (human readable).</p>",
+  "name": "EVENTNAME",
+  "featured": "https://DOMAIN/EVENTID/featured",
+  "publicKey":{
+    "id": "https://DOMAIN/EVENTID#main-key",
+    "owner": "https://DOMAIN/EVENTID",
+    "publicKeyPem": "-----BEGIN PUBLIC KEY-----\nOURPUBLICKEY\n-----END PUBLIC KEY-----\n"
+  },
+  "icon":{
+    "type": "Image",
+    "mediaType": "image/jpg",
+    "url": "https://DOMAIN/events/EVENTID.jpg"
+  }
+}
+```
+
+The Actor is of type "Person". This is because we choose to interpret the ActivityPub "Person" designation as any individual actor that can be followed and interacted with like a person.
+
+There is always a featured post `OrderedCollection` at the url "https://DOMAIN/EVENTID/featured", and it always contains the full object of a single featured post that can be retrieved at "https://DOMAIN/EVENTID/m/featuredPost". This featured post (a "pinned post" in Mastodon parlance) contains basic instructions for how to follow and interact with the event. Implementations like Mastodon will render this in the timeline, which both lets us give users a small tutorial and also means the timeline doesn't appear "blank" on first follow.
+
+## Inbox behavior
+
+This section describes how gathio responds to _incoming messages_ to its inbox.
+
+### Inbox structure
+
+Gathio has a single, universal inbox shared between all Actors. The url is:
+
+`https://DOMAIN/activitypub/inbox`
+
+You can talk to gathio by POSTing to that url as you would any ActivityPub server. The `to` (or sometimes `cc` field) is what lets us know which event Actor you're interacting with.
+
+### Follow
+
+When the server receives a `Follow` Activity, it grabs the `actor` property on the `Follow`, and then makes a GET request to that URI with `'Content-Type': 'application/activity+json'` (we assume that `actor` is a dereferencable uri that returns us the JSON for the Actor).
+
+Assuming we can find the Actor object, then we emit an `Accept` Activity back to the server, containing the full `Follow` that we just parsed. This lets the other server know that we have fully processed the follow request.
+
+After this, we *also* send a `Create` Activity to the actor's inbox, containing an `Event` object with the information for this event. This is, at the moment, future compatibility for servers that consume `Event` objects. This is sent as a "direct message", directly to the inbox with no `cc` field and not addressing the public timeline.
+
+And finally we send the user a `Create` Activity containing a `Question` object. The `Question` is an invitation to RSVP to the event. Mastodon renders this as a poll to the user, which lets them send back to us a "Yes" RSVP directly from their client UI should they so choose. This is also sent as a "direct message". Some clients like Friendica, simply ignore `Question` objects, which is fine since the user can use built-in RSVP function of Friendica to RSVP anyway (see below).
+
+### Unfollow
+
+When the server receives an `Undo/Follow`, it checks to see if that follower exists in the database. If it does, then it deletes the follower from the database.
+
+We currently do _not_ send an `Accept/Undo` in response, as I'm not sure this is ever needed in the wild.
+
+### RSVP
+
+The plan is to have this support two ways to RSVP:
+
+1. The user answers the `Question` sent out to the prospective attendee in the form of a `Create/Note` in the style of Mastodon polls. This is mostly a hack for implementations like Mastodon that don't have vocabulary built in to RSVP to `Event`s.
+2. The user sends a `Accept/Event` or `Undo/Accept/Event` back to our server. This is for implementations like Friendica that support `Event` and do things like automatically render incoming events in their UI with an RSVP interface. We currently don't accept `Reject/Event` or `TentativeAccept/Event` because gathio has no concept of a "Maybe" or "No" RSVP. It probably should have that in the future, at which case we could meaningfully parse this stuff.
+
+__The `Question` method__
+
+If the inbox gets a `Create/Note`, there is a chance that this is a response to a `Question` that we sent a user. So the first thing we do is check its `inReplyTo` property. If it matches the id of a `Question` we sent this user, and this user is still following us, then we fetch the user's profile info. This is to make sure we have their newest `preferredUsername` in their `Actor` object (falling back to `name` and then `actor`), which we will honor as the name we display on the RSVP. We then add this person to our database as an attendee of the event.
+
+Next we confirm that the user has RSVPed. We do this by sending them a `Create/Note` via direct message. The note tells them they RSVPed, and gives them a URL they can click on to instantly un-RSVP if they need to.
+
+__The `Accept/Event` method__
+
+If the inbox gets an `Accept/Event`, then it assumes this is an affirmative RSVP from the actor who sent it. We check to see if the `id` of the `Event` matches the `id` of an `Event` that we sent ot this actor. If it does, then it must be a valid, affirmative RSVP. We then get the `preferredUsername` or `name` from the actor object, and add that actor to the database as an attendee. TODO: support either object URI or embedded object here.
+
+Next we confirm that the user has RSVPed. We do this by sending them a `Create/Note` via direct message. The note tells them they RSVPed, and gives them a URL they can click on to instantly un-RSVP if they need to.
+
+### Comment on an event
+
+If we are CC'ed on a _public or unlisted_ `Create/Note`, then that is considered to be a comment on the event, which we store in our database and render on the event page if the administrator has enabled commenting.
+
+After the comment is added and rendered on the front page, we also broadcast to our followers an `Announce/Note`, containing a copy of the `Note` we just received. Some implementations treat this as a "boost", where people following our account, but not necessarily following the account that wrote the `Note`, will see the `Note` rendered with credit to the original author, promoted on behalf of our account.
+
+### Delete comment
+
+Since a user can comment on the event via ActivityPub, they should be able to delete their comment via ActivityPub as well. When the inbox gets a `Delete/Note` and we can match the note and its sender to a comment in our database, we delete the comment and it is no longer rendered on the event page. The comment is also deleted from its profile via sending a `Delete/Note` out to all followers (corresponding to the comment that was copied to the event actor's profile, not the Note originally made by the commenter on their own server, we don't own that!).
+
+### Incoming private messages
+
+*TODO*: If someone tries to DM the event, we need to reply with a message like "Sorry, this service only supports posting public messages to the event page. Try contacting the event organizer directly if you need to have a private conversation."
+
+## Activities triggered from the web app
+
+### Create event
+
+When an event is created, we create the webfinger and `Actor` object necessary for the Actor to be found. We also create an `Event` object that is stored in the database; this is later referenced and updated so we can send things out to calendar applications.
+
+### Update event
+
+When any field of an event is updated, we send a `Create/Note` out to all of the followers, containing a message that says something like "Such and such event just changed its start time to (blah), click here to see more." So this causes the message to appear in the home feed of all followers.
+
+We also send a direct message with a `Create/Note` to everyone who is RSVPed informing them of the same thing, since changes to the event are high priority for them to know about.
+
+And finally we send an `Update/Event` out with the new event details in the `Event` object, so that people's federated calendar apps can sync.
+
+### Delete event
+
+When an event is deleted by its administrator, or the event has been deleted due to it being one week after the event has ended, we send a `Delete/Actor` out to followers.  This lets followers know that the event has been deleted, and their server should remove its profile from their database. (On Mastodon this results in an automatic "unfollow", which is good because we want people's follow counts to go back to normal after an event is over and has been deleted.)
+
+We also send a `Delete/Event` out to followers. For an application like Friendica, this removes the event from the calendar of a follower.
+
+### Comment on an event
+
+When a comment is created via the web application, a `Create/Note` is sent to update the home timelines of all the event's followers. This way if you're following the event and someone who is not on the Fediverse makes a comment on the event, you are informed (but not direct messaged, because that would be annoying).
+
+### TODO: Delete comment
+
+When a comment that was created via the web app is deleted from the web app, it should also propagate a `Delete/Note` out to followers, which would remove that comment from the profile/timeline for the event.
diff --git a/activitypub.js b/activitypub.js
new file mode 100644
index 0000000..2a7c18a
--- /dev/null
+++ b/activitypub.js
@@ -0,0 +1,923 @@
+const domain = require('./config/domain.js').domain;
+const contactEmail = require('./config/domain.js').email;
+const siteName = require('./config/domain.js').sitename;
+const isFederated = require('./config/domain.js').isFederated;
+const request = require('request');
+const addToLog = require('./helpers.js').addToLog;
+const crypto = require('crypto');
+const shortid = require('shortid');
+var moment = require('moment-timezone');
+const mongoose = require('mongoose');
+const Event = mongoose.model('Event');
+const EventGroup = mongoose.model('EventGroup');
+var sanitizeHtml = require('sanitize-html');
+
+function createActivityPubActor(eventID, domain, pubkey, description, name, location, imageFilename, startUTC, endUTC, timezone) {
+  let actor = {
+    '@context': [
+      'https://www.w3.org/ns/activitystreams',
+      'https://w3id.org/security/v1'
+    ],
+
+    'id': `https://${domain}/${eventID}`,
+    'type': 'Person',
+    'preferredUsername': `${eventID}`,
+    'inbox': `https://${domain}/activitypub/inbox`,
+    'outbox': `https://${domain}/${eventID}/outbox`,
+    'followers': `https://${domain}/${eventID}/followers`,
+    'summary': `<p>${description}</p>`,
+    'name': name,
+    'featured': `https://${domain}/${eventID}/featured`,
+
+    'publicKey': {
+      'id': `https://${domain}/${eventID}#main-key`,
+      'owner': `https://${domain}/${eventID}`,
+      'publicKeyPem': pubkey
+    }
+  };
+  if (location) {
+    actor.summary += `<p>Location: ${location}.</p>`
+  }
+  let displayDate;
+  if (startUTC && timezone) {
+    displayDate = moment.tz(startUTC, timezone).format('D MMMM YYYY h:mm a');
+    actor.summary += `<p>Starting ${displayDate} ${timezone}.</p>`;
+  }
+  if (imageFilename) {
+    actor.icon = {
+      'type': 'Image',
+      'mediaType': 'image/jpg',
+      'url': `https://${domain}/events/${imageFilename}`,
+    };
+  }
+  return JSON.stringify(actor);
+}
+
+function createActivityPubEvent(name, startUTC, endUTC, timezone, description, location) {
+  const guid = crypto.randomBytes(16).toString('hex');
+  let eventObject = {
+    "@context": "https://www.w3.org/ns/activitystreams",
+    'id': `https://${domain}/${guid}`,
+    "name": name,
+    "type": "Event",
+    "startTime": moment.tz(startUTC, timezone).format(),
+    "endTime": moment.tz(endUTC, timezone).format(),
+    "content": description,
+    "location": location
+  }
+  return JSON.stringify(eventObject);
+}
+
+function createFeaturedPost(eventID, name, startUTC, endUTC, timezone, description, location) {
+  const featured = {
+    "@context": "https://www.w3.org/ns/activitystreams",
+    "id": `https://${domain}/${eventID}/m/featuredPost`,
+    "type": "Note",
+    "name": "Test",
+    'cc': 'https://www.w3.org/ns/activitystreams#Public',
+    "content": `<p>This is an event that was posted on <a href="https://${domain}">${siteName}</a>. If you follow this account, you'll see updates in your timeline about the event. If your software supports polls, you should get a poll in your DMs asking if you want to RSVP. You can reply and RSVP right from there. If your software has an event calendar built in, you should get an event in your inbox that you can RSVP to like you respond to any event.</p><p>For more information on how to interact with this, <a href="https://github.com/lowercasename/gathio/wiki/Fediverse-Instructions">check out this link</a>.</p>`,
+    'attributedTo': `https://${domain}/${eventID}`,
+  }
+  return featured;
+}
+
+function updateActivityPubEvent(oldEvent, name, startUTC, endUTC, timezone, description, location) {
+  // we want to persist the old ID no matter what happens to the Event itself
+  const id = oldEvent.id;
+  let eventObject = {
+    "@context": "https://www.w3.org/ns/activitystreams",
+    'id': id,
+    "name": name,
+    "type": "Event",
+    "startTime": moment.tz(startUTC, timezone).format(),
+    "endTime": moment.tz(endUTC, timezone).format(),
+    "content": description,
+    "location": location
+  }
+  return JSON.stringify(eventObject);
+}
+
+
+function updateActivityPubActor(actor, description, name, location, imageFilename, startUTC, endUTC, timezone) {
+  if (!actor) return;
+  actor.summary = `<p>${description}</p>`;
+  actor.name = name;
+  if (location) {
+    actor.summary += `<p>Location: ${location}.</p>`
+  }
+  let displayDate;
+  if (startUTC && timezone) {
+    displayDate = moment.tz(startUTC, timezone).format('D MMMM YYYY h:mm a');
+    actor.summary += `<p>Starting ${displayDate} ${timezone}.</p>`;
+  }
+  if (imageFilename) {
+    actor.icon = {
+      'type': 'Image',
+      'mediaType': 'image/jpg',
+      'url': `https://${domain}/events/${imageFilename}`,
+    };
+  }
+  return JSON.stringify(actor);
+}
+
+function signAndSend(message, eventID, targetDomain, inbox, callback) {
+  if (!isFederated) return;
+  let inboxFragment = inbox.replace('https://'+targetDomain,'');
+  // get the private key
+	Event.findOne({
+		id: eventID
+		})
+		.then((event) => {
+      if (event) { 
+        const privateKey = event.privateKey;
+        const signer = crypto.createSign('sha256');
+        let d = new Date();
+        let stringToSign = `(request-target): post ${inboxFragment}\nhost: ${targetDomain}\ndate: ${d.toUTCString()}`;
+        signer.update(stringToSign);
+        signer.end();
+        const signature = signer.sign(privateKey);
+        const signature_b64 = signature.toString('base64');
+        const header = `keyId="https://${domain}/${eventID}",headers="(request-target) host date",signature="${signature_b64}"`;
+        request({
+          url: inbox,
+          headers: {
+            'Host': targetDomain,
+            'Date': d.toUTCString(),
+            'Signature': header
+          },
+          method: 'POST',
+          json: true,
+          body: message
+        }, function (error, response){
+          if (error) {
+            callback(error, null, 500);
+          }
+          else {
+            // Add the message to the database
+            const messageID = message.id;
+            const newMessage = {
+              id: message.id,
+              content: JSON.stringify(message)
+            };
+            Event.findOne({
+              id: eventID,
+              }, function(err,event) {
+              if (!event) return;
+              event.activityPubMessages.push(newMessage);
+              // also add the message's object if it has one
+              if (message.object && message.object.id) {
+                event.activityPubMessages.push({
+                  id: message.object.id,
+                  content: JSON.stringify(message.object)
+                });
+              }
+              event.save()
+              .then(() => {
+                addToLog("addActivityPubMessage", "success", "ActivityPubMessage added to event " + eventID);
+                callback(null, message.id, 200);
+              })
+              .catch((err) => { addToLog("addActivityPubMessage", "error", "Attempt to add ActivityPubMessage to event " + eventID + " failed with error: " + err);
+                callback(err, null, 500);
+              });
+            })
+          }
+        });
+      }
+      else {
+        callback(`No record found for ${eventID}.`, null, 404);
+      }
+    });
+}
+
+// this function sends something to the timeline of every follower in the followers array
+// it's also an unlisted public message, meaning non-followers can see the message if they look at
+// the profile but it doesn't spam federated timelines
+function broadcastCreateMessage(apObject, followers, eventID) {
+  if (!isFederated) return;
+  let guidCreate = crypto.randomBytes(16).toString('hex');
+  Event.findOne({
+    id: eventID,
+    }, function(err, event) {
+    if (event) {
+      // iterate over followers
+      for (const follower of followers) {
+        let actorId = follower.actorId;
+        let myURL = new URL(actorId);
+        let targetDomain = myURL.hostname;
+        // get the inbox
+        const followerFound = event.followers.find(el => el.actorId === actorId);
+        if (followerFound) {
+          const actorJson = JSON.parse(follower.actorJson);
+          const inbox = actorJson.inbox;
+          const createMessage = {
+            '@context': 'https://www.w3.org/ns/activitystreams',
+            'id': `https://${domain}/${eventID}/m/${guidCreate}`,
+            'type': 'Create',
+            'actor': `https://${domain}/${eventID}`,
+            'to': [actorId],
+            'cc': 'https://www.w3.org/ns/activitystreams#Public',
+            'object': apObject
+          };
+          signAndSend(createMessage, eventID, targetDomain, inbox, function(err, resp, status) {
+            if (err) {
+              console.log(`Didn't send to ${actorId}, status ${status} with error ${err}`);
+            }
+            else {
+              console.log('sent to', actorId);
+            }
+          });
+        }
+        else {
+          console.log(`No follower found with the id ${actorId}`);
+        }
+      } // end followers
+    } // end if event
+    else {
+      console.log(`No event found with the id ${eventID}`);
+    }
+  });
+}
+
+
+// sends an Announce for the apObject
+function broadcastAnnounceMessage(apObject, followers, eventID) {
+  if (!isFederated) return;
+  let guidUpdate = crypto.randomBytes(16).toString('hex');
+  Event.findOne({
+    id: eventID,
+    }, function(err, event) {
+    if (event) {
+      // iterate over followers
+      for (const follower of followers) {
+        let actorId = follower.actorId;
+        let myURL = new URL(actorId);
+        let targetDomain = myURL.hostname;
+        // get the inbox
+        const followerFound = event.followers.find(el => el.actorId === actorId);
+        if (followerFound) {
+          const actorJson = JSON.parse(follower.actorJson);
+          const inbox = actorJson.inbox;
+          const announceMessage = {
+            '@context': 'https://www.w3.org/ns/activitystreams',
+            'id': `https://${domain}/${eventID}/m/${guidUpdate}`,
+            'cc': 'https://www.w3.org/ns/activitystreams#Public',
+            'type': 'Announce',
+            'actor': `https://${domain}/${eventID}`,
+            'object': apObject,
+            'to': actorId
+          };
+          signAndSend(announceMessage, eventID, targetDomain, inbox, function(err, resp, status) {
+            if (err) {
+              console.log(`Didn't send to ${actorId}, status ${status} with error ${err}`);
+            }
+            else {
+              console.log('sent to', actorId);
+            }
+          });
+        }
+        else {
+          console.log(`No follower found with the id ${actorId}`);
+        }
+      } // end followers
+    } // end if event
+    else {
+      console.log(`No event found with the id ${eventID}`);
+    }
+  });
+}
+
+// sends an Update for the apObject
+function broadcastUpdateMessage(apObject, followers, eventID) {
+  if (!isFederated) return;
+  let guidUpdate = crypto.randomBytes(16).toString('hex');
+  // iterate over followers
+  Event.findOne({
+    id: eventID,
+    }, function(err, event) {
+    if (event) {
+      for (const follower of followers) {
+        let actorId = follower.actorId;
+        let myURL = new URL(actorId);
+        let targetDomain = myURL.hostname;
+        // get the inbox
+        const followerFound = event.followers.find(el => el.actorId === actorId);
+        if (followerFound) {
+          const actorJson = JSON.parse(follower.actorJson);
+          const inbox = actorJson.inbox;
+          const createMessage = {
+            '@context': 'https://www.w3.org/ns/activitystreams',
+            'id': `https://${domain}/${eventID}/m/${guidUpdate}`,
+            'type': 'Update',
+            'actor': `https://${domain}/${eventID}`,
+            'object': apObject
+          };
+          signAndSend(createMessage, eventID, targetDomain, inbox, function(err, resp, status) {
+            if (err) {
+              console.log(`Didn't send to ${actorId}, status ${status} with error ${err}`);
+            }
+            else {
+              console.log('sent to', actorId);
+            }
+          });
+        }
+        else {
+          console.log(`No follower found with the id ${actorId}`);
+        }
+      } // end followers
+    }
+    else {
+      console.log(`No event found with the id ${eventID}`);
+    }
+  });
+}
+
+function broadcastDeleteMessage(apObject, followers, eventID, callback) {
+  if (!isFederated) return;
+  callback = callback || function() {};
+  // we need to build an array of promises for each message we're sending, run Promise.all(), and then that will resolve when every message has been sent (or failed)
+  // per spec, each promise will execute *as it is built*, which is fine, we just need the guarantee that they are all done
+  let promises = [];
+
+  let guidUpdate = crypto.randomBytes(16).toString('hex');
+  // iterate over followers
+  for (const follower of followers) {
+    promises.push(new Promise((resolve, reject) => {
+      let actorId = follower.actorId;
+      let myURL = new URL(actorId);
+      let targetDomain = myURL.hostname;
+      // get the inbox
+      Event.findOne({
+        id: eventID,
+        }, function(err, event) {
+        if (event) {
+          const follower = event.followers.find(el => el.actorId === actorId);
+          if (follower) {
+            const actorJson = JSON.parse(follower.actorJson);
+            const inbox = actorJson.inbox;
+            const createMessage = {
+              '@context': 'https://www.w3.org/ns/activitystreams',
+              'id': `https://${domain}/${eventID}/m/${guidUpdate}`,
+              'type': 'Delete',
+              'actor': `https://${domain}/${eventID}`,
+              'object': apObject
+            };
+            signAndSend(createMessage, eventID, targetDomain, inbox, function(err, resp, status) {
+              if (err) {
+                console.log(`Didn't send to ${actorId}, status ${status} with error ${err}`);
+                reject(`Didn't send to ${actorId}, status ${status} with error ${err}`);
+              }
+              else {
+                console.log('sent to', actorId);
+                resolve('sent to', actorId);
+              }
+            });
+          }
+          else {
+            console.log(`No follower found with the id ${actorId}`, null, 404);
+            reject(`No follower found with the id ${actorId}`, null, 404);
+          }
+        }
+        else {
+          console.log(`No event found with the id ${eventID}`, null, 404);
+          reject(`No event found with the id ${eventID}`, null, 404);
+        }
+      }); // end event
+    }));
+  } // end followers
+
+  Promise.all(promises.map(p => p.catch(e => e))).then(statuses => {
+    callback(statuses);
+  });
+}
+
+// this sends a message "to:" an individual fediverse user
+function sendDirectMessage(apObject, actorId, eventID, callback) {
+  if (!isFederated) return;
+  callback = callback || function() {};
+  const guidCreate = crypto.randomBytes(16).toString('hex');
+  const guidObject = crypto.randomBytes(16).toString('hex');
+  let d = new Date();
+
+  apObject.published = d.toISOString();
+  apObject.attributedTo = `https://${domain}/${eventID}`;
+  apObject.to = actorId;
+  apObject.id = `https://${domain}/${eventID}/m/${guidObject}`;
+  apObject.content = unescape(apObject.content)
+
+  let createMessage = {
+    '@context': 'https://www.w3.org/ns/activitystreams',
+    'id': `https://${domain}/${eventID}/m/${guidCreate}`,
+    'type': 'Create',
+    'actor': `https://${domain}/${eventID}`,
+    'to': [actorId],
+    'object': apObject
+  };
+
+  let myURL = new URL(actorId);
+  let targetDomain = myURL.hostname;
+  // get the inbox
+  Event.findOne({
+    id: eventID,
+    }, function(err, event) {
+    if (event) {
+      const follower = event.followers.find(el => el.actorId === actorId);
+      if (follower) {
+        const actorJson = JSON.parse(follower.actorJson);
+        const inbox = actorJson.inbox;
+        signAndSend(createMessage, eventID, targetDomain, inbox, callback);
+      }
+      else {
+        callback(`No follower found with the id ${actorId}`, null, 404);
+      }
+    }
+    else {
+      callback(`No event found with the id ${eventID}`, null, 404);
+    }
+  });
+}
+
+function sendAcceptMessage(thebody, eventID, targetDomain, callback) {
+  if (!isFederated) return;
+  callback = callback || function() {};
+  const guid = crypto.randomBytes(16).toString('hex');
+  const actorId = thebody.actor;
+  let message = {
+    '@context': 'https://www.w3.org/ns/activitystreams',
+    'id': `https://${domain}/${guid}`,
+    'type': 'Accept',
+    'actor': `https://${domain}/${eventID}`,
+    'object': thebody,
+  };
+  // get the inbox
+  Event.findOne({
+    id: eventID,
+    }, function(err, event) {
+    if (event) {
+      const follower = event.followers.find(el => el.actorId === actorId);
+      if (follower) {
+        const actorJson = JSON.parse(follower.actorJson);
+        const inbox = actorJson.inbox;
+        signAndSend(message, eventID, targetDomain, inbox, callback);
+      }
+    }
+    else {
+      callback(`Could not find event ${eventID}`, null, 404);
+    }
+  });
+}
+
+function _handleFollow(req, res) {
+  const myURL = new URL(req.body.actor);
+  let targetDomain = myURL.hostname;
+  let eventID = req.body.object.replace(`https://${domain}/`,'');
+  // Add the user to the DB of accounts that follow the account
+  // get the follower's username
+  request({
+    url: req.body.actor,
+    headers: {
+      'Accept': 'application/activity+json',
+      'Content-Type': 'application/activity+json'
+    }}, function (error, response, body) {
+      body = JSON.parse(body)
+      const name = body.preferredUsername || body.name || body.attributedTo;
+      const newFollower = {
+        actorId: req.body.actor,
+        followId: req.body.id,
+        name: name,
+        actorJson: JSON.stringify(body)
+      };
+      Event.findOne({
+        id: eventID,
+        }, function(err,event) {
+        // if this account is NOT already in our followers list, add it
+        if (event && !event.followers.map(el => el.actorId).includes(req.body.actor)) {
+          event.followers.push(newFollower);
+          event.save()
+          .then(() => {
+            addToLog("addEventFollower", "success", "Follower added to event " + eventID);
+            // Accept the follow request
+            sendAcceptMessage(req.body, eventID, targetDomain, function(err, resp, status) {
+              if (err) {
+                console.log(`Didn't send Accept to ${req.body.actor}, status ${status} with error ${err}`);
+              }
+              else {
+                console.log('sent Accept to', req.body.actor);
+                // ALSO send an ActivityPub Event activity since this person is "interested" in the event, as indicated by the Follow
+                const jsonEventObject = JSON.parse(event.activityPubEvent);
+                // send direct message to user
+                sendDirectMessage(jsonEventObject, newFollower.actorId, event.id);
+
+                // if users can self-RSVP, send a Question to the new follower
+                if (event.usersCanAttend) {
+                  const jsonObject = {
+                    "@context": "https://www.w3.org/ns/activitystreams",
+                    "name": `RSVP to ${event.name}`,
+                    "type": "Question",
+                     "content": `<span class=\"h-card\"><a href="${req.body.actor}" class="u-url mention">@<span>${name}</span></a></span> Will you attend ${event.name}? (If you reply "Yes", you'll be listed as an attendee on the event page.)`,
+                     "oneOf": [
+                       {"type":"Note","name": "Yes"},
+                     ],
+                    "endTime":event.start.toISOString(),
+                    "tag":[{"type":"Mention","href":req.body.actor,"name":name}]
+                  }
+                  // send direct message to user
+                  sendDirectMessage(jsonObject, req.body.actor, eventID, function (error, response, statuscode) {
+                    if (error) {
+                      console.log('Error sending direct message:', error);
+                      return res.status(statuscode).json(error);
+                    }
+                    else {
+                      return res.status(statuscode).json({messageid: response});
+                    }
+                  });
+                }
+              }
+            });
+          })
+          .catch((err) => {
+            addToLog("addEventFollower", "error", "Attempt to add follower to event " + eventID + " failed with error: " + err); 
+            return res.status(500).send('Database error, please try again :(');
+          });
+        }
+        else {
+          // this person is already a follower so just say "ok"
+          return res.status(200);
+        }
+      })
+    }) //end request
+}
+
+function _handleUndoFollow(req, res) {
+  // get the record of all followers for this account
+  const eventID = req.body.object.object.replace(`https://${domain}/`,'');
+  Event.findOne({
+    id: eventID,
+    }, function(err,event) {
+      if (!event) return;
+      // check to see if the Follow object's id matches the id we have on record
+      // is this even someone who follows us
+      const indexOfFollower = event.followers.findIndex(el => el.actorId === req.body.object.actor);
+      if (indexOfFollower !== -1) {
+        // does the id we have match the id we are being given
+        if (event.followers[indexOfFollower].followId === req.body.object.id) {
+          // we have a match and can trust the Undo! remove this person from the followers list
+          event.followers.splice(indexOfFollower, 1);
+          event.save()
+          .then(() => {
+            addToLog("removeEventFollower", "success", "Follower removed from event " + eventID);
+            return res.sendStatus(200);
+          })
+          .catch((err) => { 
+            addToLog("removeEventFollower", "error", "Attempt to remove follower from event " + eventID + " failed with error: " + err); 
+            return res.send('Database error, please try again :('); 
+          });
+        }
+      }
+  });
+}
+
+function _handleAcceptEvent(req, res) {
+  let {name, attributedTo, inReplyTo, to, actor} = req.body;
+  if (Array.isArray(to)) {
+    to = to[0];
+  }
+  const eventID = to.replace(`https://${domain}/`,'');
+  Event.findOne({
+    id: eventID,
+    }, function(err,event) {
+      if (!event) return;
+      // does the id we got match the id of a thing we sent out
+      const message = event.activityPubMessages.find(el => el.id === req.body.object);
+      if (message) {
+        // it's a match
+        request({
+          url: actor,
+          headers: {
+            'Accept': 'application/activity+json',
+            'Content-Type': 'application/activity+json'
+          }}, function (error, response, body) {
+            body = JSON.parse(body)
+            // if this account is NOT already in our attendees list, add it
+            if (!event.attendees.map(el => el.id).includes(actor)) {
+              const attendeeName = body.preferredUsername || body.name || actor;
+              const newAttendee = {
+                name: attendeeName,
+                status: 'attending',
+                id: actor
+              };
+              event.attendees.push(newAttendee);
+              event.save()
+              .then((fullEvent) => {
+                addToLog("addEventAttendee", "success", "Attendee added to event " + req.params.eventID);
+                // get the new attendee with its hidden id from the full event
+                let fullAttendee = fullEvent.attendees.find(el => el.id === actor);
+                // send a "click here to remove yourself" link back to the user as a DM
+                const jsonObject = {
+                  "@context": "https://www.w3.org/ns/activitystreams",
+                  "name": `RSVP to ${event.name}`,
+                  "type": "Note",
+                  "content": `<span class=\"h-card\"><a href="${newAttendee.id}" class="u-url mention">@<span>${newAttendee.name}</span></a></span> Thanks for RSVPing! You can remove yourself from the RSVP list by clicking here: <a href="https://${domain}/oneclickunattendevent/${event.id}/${fullAttendee._id}">https://${domain}/oneclickunattendevent/${event.id}/${fullAttendee._id}</a>`,
+                  "tag":[{"type":"Mention","href":newAttendee.id,"name":newAttendee.name}]
+                }
+                // send direct message to user
+                sendDirectMessage(jsonObject, newAttendee.id, event.id);
+                return res.sendStatus(200);
+              })
+              .catch((err) => { 
+                addToLog("addEventAttendee", "error", "Attempt to add attendee to event " + req.params.eventID + " failed with error: " + err);
+                return res.status(500).send('Database error, please try again :(');
+              });
+            }
+            else {
+              // it's a duplicate and this person is already rsvped so just say OK
+              return res.status(200).send("Attendee is already registered.");
+            }
+        });
+      }
+    });
+}
+
+function _handleUndoAcceptEvent(req, res) {
+  let {name, attributedTo, inReplyTo, to, actor} = req.body;
+  if (Array.isArray(to)) {
+    to = to[0];
+  }
+  const eventID = to.replace(`https://${domain}/`,'');
+  Event.findOne({
+    id: eventID,
+    }, function(err,event) {
+    if (!event) return;
+    // does the id we got match the id of a thing we sent out
+    const message = event.activityPubMessages.find(el => el.id === req.body.object.object);
+    if (message) {
+      // it's a match
+      Event.update(
+          { id: eventID },
+          { $pull: { attendees: { id: actor } } }
+      )
+      .then(response => {
+        addToLog("oneClickUnattend", "success", "Attendee removed via one click unattend " + req.params.eventID);
+      });
+    }
+  });
+}
+
+function _handleCreateNote(req, res) {
+  // figure out what this is in reply to -- it should be addressed specifically to us
+  let {name, attributedTo, inReplyTo, to} = req.body.object;
+  // if it's an array just grab the first element, since a poll should only broadcast back to the pollster
+  if (Array.isArray(to)) {
+    to = to[0];
+  }
+  const eventID = to.replace(`https://${domain}/`,'');
+  // make sure this person is actually a follower
+  Event.findOne({
+    id: eventID,
+    }, function(err,event) {
+      if (!event) return;
+      // is this even someone who follows us
+      const indexOfFollower = event.followers.findIndex(el => el.actorId === req.body.object.attributedTo);
+      if (indexOfFollower !== -1) {
+        // compare the inReplyTo to its stored message, if it exists and it's going to the right follower then this is a valid reply
+        const message = event.activityPubMessages.find(el => {
+          const content = JSON.parse(el.content);
+          return inReplyTo === (content.object && content.object.id);
+        });
+        if (message) {
+          const content = JSON.parse(message.content);
+          // check if the message we sent out was sent to the actor this incoming message is attributedTo
+          if (content.to[0] === attributedTo) {
+            // it's a match, this is a valid poll response, add RSVP to database
+            // fetch the profile information of the user
+            request({
+              url: attributedTo,
+              headers: {
+                'Accept': 'application/activity+json',
+                'Content-Type': 'application/activity+json'
+              }}, function (error, response, body) {
+                body = JSON.parse(body)
+                // if this account is NOT already in our attendees list, add it
+                if (!event.attendees.map(el => el.id).includes(attributedTo)) {
+                  const attendeeName = body.preferredUsername || body.name || attributedTo;
+                  const newAttendee = {
+                    name: attendeeName,
+                    status: 'attending',
+                    id: attributedTo
+                  };
+                  event.attendees.push(newAttendee);
+                  event.save()
+                  .then((fullEvent) => {
+                    addToLog("addEventAttendee", "success", "Attendee added to event " + req.params.eventID);
+                    // get the new attendee with its hidden id from the full event
+                    let fullAttendee = fullEvent.attendees.find(el => el.id === attributedTo);
+                    // send a "click here to remove yourself" link back to the user as a DM
+                    const jsonObject = {
+                      "@context": "https://www.w3.org/ns/activitystreams",
+                      "name": `RSVP to ${event.name}`,
+                      "type": "Note",
+                      "content": `<span class=\"h-card\"><a href="${newAttendee.id}" class="u-url mention">@<span>${newAttendee.name}</span></a></span> Thanks for RSVPing! You can remove yourself from the RSVP list by clicking here: <a href="https://${domain}/oneclickunattendevent/${event.id}/${fullAttendee._id}">https://${domain}/oneclickunattendevent/${event.id}/${fullAttendee._id}</a>`,
+                      "tag":[{"type":"Mention","href":newAttendee.id,"name":newAttendee.name}]
+                    }
+                    // send direct message to user
+                    sendDirectMessage(jsonObject, newAttendee.id, event.id);
+                    return res.sendStatus(200);
+                  })
+                  .catch((err) => {
+                    addToLog("addEventAttendee", "error", "Attempt to add attendee to event " + req.params.eventID + " failed with error: " + err);
+                    return res.status(500).send('Database error, please try again :(');
+                  });
+                }
+                else {
+                  // it's a duplicate and this person is already rsvped so just say OK
+                  return res.status(200).send("Attendee is already registered.");
+                }
+            });
+          }
+        }
+      }
+  });
+}
+
+function _handleDelete(req, res) {
+  const deleteObjectId = req.body.object.id;
+  // find all events with comments from the author
+  Event.find({
+    "comments.actorId":req.body.actor
+    }, function(err,events) {
+    if (!events) {
+      return res.sendStatus(404);
+    }
+
+    // find the event with THIS comment from the author
+    let eventWithComment = events.find(event => {
+      let comments = event.comments;
+      return comments.find(comment => {
+        if (!comment.activityJson) {
+          return false;
+        }
+        return JSON.parse(comment.activityJson).object.id === req.body.object.id;
+      })
+    });
+
+    if (!eventWithComment) {
+      return res.sendStatus(404);
+    }
+
+    // delete the comment
+    // find the index of the comment, it should have an activityJson field because from an AP server you can only delete an AP-originated comment (and of course it needs to be yours)
+    let indexOfComment = eventWithComment.comments.findIndex(comment => {
+      return comment.activityJson && JSON.parse(comment.activityJson).object.id === req.body.object.id;
+    });
+    eventWithComment.comments.splice(indexOfComment, 1);
+    eventWithComment.save()
+    .then(() => {
+      addToLog("deleteComment", "success", "Comment deleted from event " + eventWithComment.id);
+      return res.sendStatus(200);
+    })
+    .catch((err) => {
+      addToLog("deleteComment", "error", "Attempt to delete comment " + req.body.object.id + "from event " + eventWithComment.id + " failed with error: " + err);
+      return res.sendStatus(500); 
+    });
+  });
+}
+
+function _handleCreateNoteComment(req, res) {
+  // figure out what this is in reply to -- it should be addressed specifically to us
+  let {attributedTo, inReplyTo, to, cc} = req.body.object;
+  // normalize cc into an array
+  if (typeof cc === 'string') {
+    cc = [cc];
+  }
+  // normalize to into an array
+  if (typeof to === 'string') {
+    to = [to];
+  }
+  
+  // if this is a public message (in the to or cc fields)
+  if (to.includes('https://www.w3.org/ns/activitystreams#Public') || (Array.isArray(cc) && cc.includes('https://www.w3.org/ns/activitystreams#Public'))) {
+    // figure out which event(s) of ours it was addressing
+    let ourEvents = cc.filter(el => el.includes(`https://${domain}/`))
+                  .map(el => el.replace(`https://${domain}/`,''));
+    // comments should only be on one event. if more than one, ignore (spam, probably) 
+    if (ourEvents.length === 1) {
+      let eventID = ourEvents[0];
+      // add comment
+      let commentID = shortid.generate();
+      // get the actor for the commenter
+      request({
+        url: req.body.actor,
+        headers: {
+          'Accept': 'application/activity+json',
+          'Content-Type': 'application/activity+json'
+        }}, function (error, response, actor) {
+        if (!error) {
+          const parsedActor = JSON.parse(actor);
+          const name = parsedActor.preferredUsername || parsedActor.name || req.body.actor;
+          const newComment = {
+            id: commentID,
+            actorId: req.body.actor,
+            activityId: req.body.object.id,
+            author: name,
+            content: sanitizeHtml(req.body.object.content, {allowedTags: [], allowedAttributes: {}}).replace('@'+eventID,''),
+            timestamp: moment(),
+            activityJson: JSON.stringify(req.body),
+            actorJson: actor
+          };
+
+          Event.findOne({
+            id: eventID,
+            }, function(err,event) {
+            if (!event) {
+              return res.sendStatus(404);
+            }
+            if (!event.usersCanComment) {
+              return res.sendStatus(200);
+            }
+            event.comments.push(newComment);
+            event.save()
+            .then(() => {
+              addToLog("addEventComment", "success", "Comment added to event " + eventID);
+              const guidObject = crypto.randomBytes(16).toString('hex');
+              const jsonObject = req.body.object;
+              jsonObject.attributedTo = newComment.actorId;
+              broadcastAnnounceMessage(jsonObject, event.followers, eventID)
+              return res.sendStatus(200);
+            })
+            .catch((err) => {
+              addToLog("addEventComment", "error", "Attempt to add comment to event " + eventID + " failed with error: " + err);
+              res.status(500).send('Database error, please try again :(' + err);
+            });
+          });
+        }
+      });
+    } // end ourevent
+  } // end public message
+}
+
+function processInbox(req, res) {
+  if (!isFederated) return res.sendStatus(404);
+  try {
+    // if a Follow activity hits the inbox
+    if (typeof req.body.object === 'string' && req.body.type === 'Follow') {
+      _handleFollow(req, res);
+    }
+    // if an Undo activity with a Follow object hits the inbox
+    if (req.body && req.body.type === 'Undo' && req.body.object && req.body.object.type === 'Follow') {
+      _handleUndoFollow(req, res);
+    }
+    // if an Accept activity with the id of the Event we sent out hits the inbox, it is an affirmative RSVP
+    if (req.body && req.body.type === 'Accept' && req.body.object && typeof req.body.object === 'string') {
+      _handleAcceptEvent(req, res);
+    }
+    // if an Undo activity containing an Accept containing the id of the Event we sent out hits the inbox, it is an undo RSVP
+    if (req.body && req.body.type === 'Undo' && req.body.object && req.body.object.object && typeof req.body.object.object === 'string' && req.body.object.type === 'Accept') {
+      _handleUndoAcceptEvent(req, res);
+    }
+    // if a Create activity with a Note object hits the inbox, and it's a reply, it might be a vote in a poll
+    if (req.body && req.body.type === 'Create' && req.body.object && req.body.object.type === 'Note' && req.body.object.inReplyTo && req.body.object.to) {
+      _handleCreateNote(req, res);
+    }
+    // if a Delete activity hits the inbox, it might a deletion of a comment
+    if (req.body && req.body.type === 'Delete') {
+      _handleDelete(req, res);
+    }
+    // if we are CC'ed on a public or unlisted Create/Note, then this is a comment to us we should boost (Announce) to our followers
+    if (req.body && req.body.type === 'Create' && req.body.object && req.body.object.type === 'Note' && req.body.object.to) {
+      _handleCreateNoteComment(req, res);
+    } // CC'ed
+  }
+  catch(e) {
+    console.log('Error in processing inbox:', e)
+  }
+}
+
+function createWebfinger(eventID, domain) {
+  return {
+    'subject': `acct:${eventID}@${domain}`,
+
+    'links': [
+      {
+        'rel': 'self',
+        'type': 'application/activity+json',
+        'href': `https://${domain}/${eventID}`
+      }
+    ]
+  };
+}
+
+module.exports = {
+  processInbox,
+  sendAcceptMessage,
+  sendDirectMessage,
+  broadcastAnnounceMessage,
+  broadcastUpdateMessage,
+  broadcastDeleteMessage,
+  broadcastCreateMessage,
+  signAndSend,
+  createActivityPubActor,
+  updateActivityPubActor,
+  createActivityPubEvent,
+  updateActivityPubEvent,
+  createFeaturedPost,
+  createWebfinger,
+}
diff --git a/app.js b/app.js
index 42626ff..c6e0647 100755
--- a/app.js
+++ b/app.js
@@ -47,7 +47,7 @@ app.set('hbsInstance', hbsInstance);
 app.use(express.static('public'));
 
 // Router //
-
+app.use(bodyParser.json({ type: "application/activity+json" })); // support json encoded bodies
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use('/', routes);
 
diff --git a/config/domain-example.js b/config/domain-example.js
index b84e210..c019a4a 100644
--- a/config/domain-example.js
+++ b/config/domain-example.js
@@ -4,6 +4,7 @@ module.exports = {
     'port': '3000',
     'email': 'contact@example.com',
     'sitename': 'gathio',
+    'isFederated': true,
     // If left blank, this defaults to https://yourdomain.com/images/gathio-email-logo.gif. Set a full URL here to change it to your own logo (or just change the file itself)
     'logo_url': ''
 };
diff --git a/helpers.js b/helpers.js
new file mode 100644
index 0000000..629f2d0
--- /dev/null
+++ b/helpers.js
@@ -0,0 +1,19 @@
+const mongoose = require('mongoose');
+const Log = mongoose.model('Log');
+var moment = require('moment-timezone');
+
+// LOGGING
+
+function addToLog(process, status, message) {
+	let logEntry = new Log({
+		status: status,
+		process: process,
+		message: message,
+		timestamp: moment()
+	});
+	logEntry.save().catch(() => { console.log("Error saving log entry!") });
+}
+
+module.exports = {
+  addToLog
+}
diff --git a/models/Event.js b/models/Event.js
index c67869e..07f0b70 100755
--- a/models/Event.js
+++ b/models/Event.js
@@ -16,9 +16,35 @@ const Attendees = new mongoose.Schema({
 	removalPassword: {
 		type: String,
 		trim: true
-	}
+	},
+  id: {
+		type: String,
+		trim: true
+  }
 })
 
+const Followers = new mongoose.Schema({
+  // this is the id of the original follow *request*, which we use to validate Undo events
+  followId: {
+		type: String,
+		trim: true
+  },
+  // this is the actual remote user profile id
+	actorId: {
+		type: String,
+		trim: true
+	},
+  // this is the stringified JSON of the entire user profile
+	actorJson: {
+		type: String,
+		trim: true
+	},
+  name: {
+		type: String,
+		trim: true
+  },
+}, {_id: false})
+
 const ReplySchema = new mongoose.Schema({
 	id: {
 		type: String,
@@ -43,6 +69,20 @@ const ReplySchema = new mongoose.Schema({
 	}
 })
 
+const ActivityPubMessages = new mongoose.Schema({
+	id: {
+		type: String,
+		required: true,
+		unique: true,
+		sparse: true
+	},
+	content: {
+		type: String,
+		trim: true,
+		required: true
+	}
+})
+
 const CommentSchema = new mongoose.Schema({
 	id: {
 		type: String,
@@ -65,6 +105,22 @@ const CommentSchema = new mongoose.Schema({
 		trim: true,
 		required: true
 	},
+  activityJson: {
+		type: String,
+		trim: true
+  },
+  actorJson: {
+		type: String,
+		trim: true
+  },
+  activityId: {
+		type: String,
+		trim: true
+  },
+  actorId: {
+		type: String,
+		trim: true
+  },
 	replies: [ReplySchema]
 })
 
@@ -163,7 +219,25 @@ const EventSchema = new mongoose.Schema({
 	maxAttendees: {
 		type: Number
 	},
-	comments: [CommentSchema]
+	comments: [CommentSchema],
+  activityPubActor: {
+    type: String,
+    trim: true
+  },
+  activityPubEvent: {
+    type: String,
+    trim: true
+  },
+  publicKey: {
+    type: String,
+    trim: true
+  },
+  privateKey: {
+    type: String,
+    trim: true
+  },
+	followers: [Followers],
+  activityPubMessages: [ActivityPubMessages]
 });
 
 module.exports = mongoose.model('Event', EventSchema);
diff --git a/package-lock.json b/package-lock.json
index a8f6675..e8c5347 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -586,9 +586,9 @@
       "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
     },
     "aws4": {
-      "version": "1.8.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.8.0.tgz",
-      "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ=="
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.9.0.tgz",
+      "integrity": "sha512-Uvq6hVe90D0B2WEnUqtdgY1bATGz3mw33nH9Y+dmA+w5DHvUmBgkr5rM/KCHpCsiFNRUfokW/szpPPgMK2hm4A=="
     },
     "balanced-match": {
       "version": "1.0.0",
@@ -923,8 +923,7 @@
             "ansi-regex": {
               "version": "2.1.1",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "aproba": {
               "version": "1.2.0",
@@ -945,14 +944,12 @@
             "balanced-match": {
               "version": "1.0.0",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "brace-expansion": {
               "version": "1.1.11",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "balanced-match": "^1.0.0",
                 "concat-map": "0.0.1"
@@ -967,20 +964,17 @@
             "code-point-at": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "concat-map": {
               "version": "0.0.1",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "console-control-strings": {
               "version": "1.1.0",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "core-util-is": {
               "version": "1.0.2",
@@ -1097,8 +1091,7 @@
             "inherits": {
               "version": "2.0.3",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "ini": {
               "version": "1.3.5",
@@ -1110,7 +1103,6 @@
               "version": "1.0.0",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "number-is-nan": "^1.0.0"
               }
@@ -1125,7 +1117,6 @@
               "version": "3.0.4",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "brace-expansion": "^1.1.7"
               }
@@ -1133,14 +1124,12 @@
             "minimist": {
               "version": "0.0.8",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "minipass": {
               "version": "2.3.5",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.2",
                 "yallist": "^3.0.0"
@@ -1159,7 +1148,6 @@
               "version": "0.5.1",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -1240,8 +1228,7 @@
             "number-is-nan": {
               "version": "1.0.1",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "object-assign": {
               "version": "4.1.1",
@@ -1253,7 +1240,6 @@
               "version": "1.4.0",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -1339,8 +1325,7 @@
             "safe-buffer": {
               "version": "5.1.2",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -1376,7 +1361,6 @@
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
@@ -1396,7 +1380,6 @@
               "version": "3.0.1",
               "bundled": true,
               "dev": true,
-              "optional": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -1440,14 +1423,12 @@
             "wrappy": {
               "version": "1.0.2",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             },
             "yallist": {
               "version": "3.0.3",
               "bundled": true,
-              "dev": true,
-              "optional": true
+              "dev": true
             }
           }
         },
@@ -1554,9 +1535,9 @@
       }
     },
     "commander": {
-      "version": "2.20.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.0.tgz",
-      "integrity": "sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==",
+      "version": "2.20.3",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
+      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
       "optional": true
     },
     "component-emitter": {
@@ -1822,11 +1803,54 @@
         "esutils": "^2.0.2"
       }
     },
+    "dom-serializer": {
+      "version": "0.2.2",
+      "resolved": "https://registry.npmjs.org/dom-serializer/-/dom-serializer-0.2.2.tgz",
+      "integrity": "sha512-2/xPb3ORsQ42nHYiSunXkDjPLBaEj/xTwUO4B7XCZQTRk7EBtTOPaygh10YAAh2OI1Qrp6NWfpAhzswj0ydt9g==",
+      "requires": {
+        "domelementtype": "^2.0.1",
+        "entities": "^2.0.0"
+      },
+      "dependencies": {
+        "domelementtype": {
+          "version": "2.0.1",
+          "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-2.0.1.tgz",
+          "integrity": "sha512-5HOHUDsYZWV8FGWN0Njbr/Rn7f/eWSQi1v7+HsUVwXgn8nWWlL64zKDkS0n8ZmQ3mlWOMuXOnR+7Nx/5tMO5AQ=="
+        },
+        "entities": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/entities/-/entities-2.0.0.tgz",
+          "integrity": "sha512-D9f7V0JSRwIxlRI2mjMqufDrRDnx8p+eEOz7aUM9SuvF8gsBzra0/6tbjl1m8eQHrZlYj6PxqE00hZ1SAIKPLw=="
+        }
+      }
+    },
     "dom-walk": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/dom-walk/-/dom-walk-0.1.1.tgz",
       "integrity": "sha1-ZyIm3HTI95mtNTB9+TaroRrNYBg="
     },
+    "domelementtype": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/domelementtype/-/domelementtype-1.3.1.tgz",
+      "integrity": "sha512-BSKB+TSpMpFI/HOxCNr1O8aMOTZ8hT3pM3GQ0w/mWRmkhEDSFJkkyzz4XQsBV44BChwGkrDfMyjVD0eA2aFV3w=="
+    },
+    "domhandler": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/domhandler/-/domhandler-2.4.2.tgz",
+      "integrity": "sha512-JiK04h0Ht5u/80fdLMCEmV4zkNh2BcoMFBmZ/91WtYZ8qVXSKjiw7fXMgFPnHcSZgOo3XdinHvmnDUeMf5R4wA==",
+      "requires": {
+        "domelementtype": "1"
+      }
+    },
+    "domutils": {
+      "version": "1.7.0",
+      "resolved": "https://registry.npmjs.org/domutils/-/domutils-1.7.0.tgz",
+      "integrity": "sha512-Lgd2XcJ/NjEw+7tFvfKxOzCYKZsdct5lczQ2ZaQY8Djz7pfAD3Gbp8ySJWtreII/vDlMVmxwa6pHmdxIYgttDg==",
+      "requires": {
+        "dom-serializer": "0",
+        "domelementtype": "1"
+      }
+    },
     "dot-prop": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/dot-prop/-/dot-prop-4.2.0.tgz",
@@ -1885,6 +1909,11 @@
       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
       "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
     },
+    "entities": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-1.1.2.tgz",
+      "integrity": "sha512-f2LZMYl1Fzu7YSBKg+RoROelpOaNrcGmE9AZubeDfrCEia483oW4MI4VyFd5VNHIgQ/7qm1I0wUHK1eJnn2y2w=="
+    },
     "es-abstract": {
       "version": "1.13.0",
       "resolved": "https://registry.npmjs.org/es-abstract/-/es-abstract-1.13.0.tgz",
@@ -2568,6 +2597,11 @@
       "integrity": "sha1-GwqzvVU7Kg1jmdKcDj6gslIHgyc=",
       "dev": true
     },
+    "generate-rsa-keypair": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/generate-rsa-keypair/-/generate-rsa-keypair-0.2.1.tgz",
+      "integrity": "sha512-vxLfzfy6WbMLtkKV4AJtg7QH0ZqGGNkSYM6S0Q72Z70QXsztLklKFtX15te3YLIqmiQAYi3g3MWsTfXd6djkpg=="
+    },
     "get-stream": {
       "version": "3.0.0",
       "resolved": "http://registry.npmjs.org/get-stream/-/get-stream-3.0.0.tgz",
@@ -2787,6 +2821,31 @@
         }
       }
     },
+    "htmlparser2": {
+      "version": "3.10.1",
+      "resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-3.10.1.tgz",
+      "integrity": "sha512-IgieNijUMbkDovyoKObU1DUhm1iwNYE/fuifEoEHfd1oZKZDaONBSkal7Y01shxsM49R4XaMdGez3WnF9UfiCQ==",
+      "requires": {
+        "domelementtype": "^1.3.1",
+        "domhandler": "^2.3.0",
+        "domutils": "^1.5.1",
+        "entities": "^1.1.1",
+        "inherits": "^2.0.1",
+        "readable-stream": "^3.1.1"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "3.4.0",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.4.0.tgz",
+          "integrity": "sha512-jItXPLmrSR8jmTRmRWJXCnGJsfy85mB3Wd/uINMXA65yrnFo0cPClFIUWzo2najVNSl+mx7/4W8ttlLWJe99pQ==",
+          "requires": {
+            "inherits": "^2.0.3",
+            "string_decoder": "^1.1.1",
+            "util-deprecate": "^1.0.1"
+          }
+        }
+      }
+    },
     "http-errors": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
@@ -3426,6 +3485,16 @@
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
       "integrity": "sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A=="
     },
+    "lodash.clonedeep": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz",
+      "integrity": "sha1-4j8/nE+Pvd6HJSnBBxhXoIblzO8="
+    },
+    "lodash.escaperegexp": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/lodash.escaperegexp/-/lodash.escaperegexp-4.1.2.tgz",
+      "integrity": "sha1-ZHYsSGGAglGKw99Mz11YhtriA0c="
+    },
     "lodash.includes": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/lodash.includes/-/lodash.includes-4.3.0.tgz",
@@ -3456,6 +3525,11 @@
       "resolved": "https://registry.npmjs.org/lodash.isstring/-/lodash.isstring-4.0.1.tgz",
       "integrity": "sha1-1SfftUVuynzJu5XV2ur4i6VKVFE="
     },
+    "lodash.mergewith": {
+      "version": "4.6.2",
+      "resolved": "https://registry.npmjs.org/lodash.mergewith/-/lodash.mergewith-4.6.2.tgz",
+      "integrity": "sha512-GK3g5RPZWTRSeLSpgP8Xhra+pnjBC56q9FZYe1d5RN3TJ35dbkGy3YqBSMbyCrlbi+CM9Z3Jk5yTL7RCsqboyQ=="
+    },
     "lodash.once": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/lodash.once/-/lodash.once-4.1.1.tgz",
@@ -3864,6 +3938,11 @@
         "path-key": "^2.0.0"
       }
     },
+    "number-is-nan": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
+      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
+    },
     "oauth-sign": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.9.0.tgz",
@@ -4152,6 +4231,51 @@
       "integrity": "sha1-AerA/jta9xoqbAL+q7jB/vfgDqs=",
       "dev": true
     },
+    "postcss": {
+      "version": "7.0.24",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-7.0.24.tgz",
+      "integrity": "sha512-Xl0XvdNWg+CblAXzNvbSOUvgJXwSjmbAKORqyw9V2AlHrm1js2gFw9y3jibBAhpKZi8b5JzJCVh/FyzPsTtgTA==",
+      "requires": {
+        "chalk": "^2.4.2",
+        "source-map": "^0.6.1",
+        "supports-color": "^6.1.0"
+      },
+      "dependencies": {
+        "chalk": {
+          "version": "2.4.2",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+          "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+          "requires": {
+            "ansi-styles": "^3.2.1",
+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          },
+          "dependencies": {
+            "supports-color": {
+              "version": "5.5.0",
+              "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+              "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+              "requires": {
+                "has-flag": "^3.0.0"
+              }
+            }
+          }
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+        },
+        "supports-color": {
+          "version": "6.1.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-6.1.0.tgz",
+          "integrity": "sha512-qe1jfm1Mg7Nq/NSh6XE24gPXROEVsWHxC1LIx//XNlD9iw7YZQGjZNjYN7xGaEG6iKdA8EtNFW6R0gjnVXp+wQ==",
+          "requires": {
+            "has-flag": "^3.0.0"
+          }
+        }
+      }
+    },
     "prelude-ls": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz",
@@ -4204,9 +4328,9 @@
       "dev": true
     },
     "psl": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/psl/-/psl-1.2.0.tgz",
-      "integrity": "sha512-GEn74ZffufCmkDDLNcl3uuyF/aSD6exEyh1v/ZSdAomB82t6G9hzJVRx0jBmLDW+VfZqks3aScmMw9DszwUalA=="
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/psl/-/psl-1.6.0.tgz",
+      "integrity": "sha512-SYKKmVel98NCOYXpkwUqZqh0ahZeeKfmisiLIcEZdsb+WbLv02g/dI5BUmZnIyOe7RzZtLax81nnb2HbvC2tzA=="
     },
     "pstree.remy": {
       "version": "1.1.2",
@@ -4516,6 +4640,23 @@
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
       "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg=="
     },
+    "sanitize-html": {
+      "version": "1.20.1",
+      "resolved": "https://registry.npmjs.org/sanitize-html/-/sanitize-html-1.20.1.tgz",
+      "integrity": "sha512-txnH8TQjaQvg2Q0HY06G6CDJLVYCpbnxrdO0WN8gjCKaU5J0KbyGYhZxx5QJg3WLZ1lB7XU9kDkfrCXUozqptA==",
+      "requires": {
+        "chalk": "^2.4.1",
+        "htmlparser2": "^3.10.0",
+        "lodash.clonedeep": "^4.5.0",
+        "lodash.escaperegexp": "^4.1.2",
+        "lodash.isplainobject": "^4.0.6",
+        "lodash.isstring": "^4.0.1",
+        "lodash.mergewith": "^4.6.1",
+        "postcss": "^7.0.5",
+        "srcset": "^1.0.0",
+        "xtend": "^4.0.1"
+      }
+    },
     "sax": {
       "version": "1.2.4",
       "resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
@@ -4803,6 +4944,15 @@
       "integrity": "sha1-BOaSb2YolTVPPdAVIDYzuFcpfiw=",
       "dev": true
     },
+    "srcset": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/srcset/-/srcset-1.0.0.tgz",
+      "integrity": "sha1-pWad4StC87HV6D7QPHEEb8SPQe8=",
+      "requires": {
+        "array-uniq": "^1.0.2",
+        "number-is-nan": "^1.0.0"
+      }
+    },
     "sshpk": {
       "version": "1.16.1",
       "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.16.1.tgz",
@@ -5108,12 +5258,12 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
     "uglify-js": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.0.tgz",
-      "integrity": "sha512-W+jrUHJr3DXKhrsS7NUVxn3zqMOFn0hL/Ei6v0anCIMoKC93TjcflTagwIHLW7SfMFfiQuktQyFVCFHGUE0+yg==",
+      "version": "3.7.3",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.7.3.tgz",
+      "integrity": "sha512-7tINm46/3puUA4hCkKYo4Xdts+JDaVC9ZPRcG8Xw9R4nhO/gZgUM3TENq8IF4Vatk8qCig4MzP/c8G4u2BkVQg==",
       "optional": true,
       "requires": {
-        "commander": "~2.20.0",
+        "commander": "~2.20.3",
         "source-map": "~0.6.1"
       },
       "dependencies": {
@@ -5280,9 +5430,9 @@
       "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
     },
     "uuid": {
-      "version": "3.3.2",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
+      "version": "3.3.3",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.3.tgz",
+      "integrity": "sha512-pW0No1RGHgzlpHJO1nsVrHKpOEIxkGg1xB+v0ZmdNH5OAeAwzAVrCnI2/6Mtx+Uys6iaylxa+D3g4j63IKKjSQ=="
     },
     "v8-compile-cache": {
       "version": "2.0.3",
diff --git a/package.json b/package.json
index bce9181..785a059 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
   "scripts": {
     "start": "nodemon ./start.js"
   },
+  "engines": { "node" : ">=10.18.1" },
   "keywords": [],
   "author": "",
   "license": "ISC",
@@ -20,6 +21,7 @@
     "express-jwt": "^5.3.1",
     "express-session": "^1.15.6",
     "express-validator": "^5.3.0",
+    "generate-rsa-keypair": "^0.2.1",
     "greenlock": "^2.6.7",
     "greenlock-express": "^2.6.7",
     "ical": "^0.6.0",
@@ -32,6 +34,8 @@
     "multer": "^1.4.1",
     "node-schedule": "^1.3.1",
     "randomstring": "^1.1.5",
+    "request": "^2.88.0",
+    "sanitize-html": "^1.20.1",
     "shortid": "^2.2.14"
   },
   "devDependencies": {
diff --git a/public/css/style.css b/public/css/style.css
index e55f07a..ff17b50 100755
--- a/public/css/style.css
+++ b/public/css/style.css
@@ -269,6 +269,7 @@ body, html {
 	text-overflow: "";
 	overflow: hidden;
 	max-width: 62px;
+  color: #fff;
 }
 
 .remove-attendee {
@@ -345,4 +346,4 @@ body, html {
 .code {
 	font-family: 'Courier New', Courier, monospace;
 	overflow-wrap: anywhere;
-}
\ No newline at end of file
+}
diff --git a/routes.js b/routes.js
index 840ac00..5080cd0 100755
--- a/routes.js
+++ b/routes.js
@@ -14,63 +14,73 @@ const router = express.Router();
 
 const Event = mongoose.model('Event');
 const EventGroup = mongoose.model('EventGroup');
-const Log = mongoose.model('Log');
+const addToLog = require('./helpers.js').addToLog;
 
 var moment = require('moment-timezone');
 
 const marked = require('marked');
 
+const generateRSAKeypair = require('generate-rsa-keypair');
+const crypto = require('crypto');
+const request = require('request');
+
 const domain = require('./config/domain.js').domain;
 const contactEmail = require('./config/domain.js').email;
 const siteName = require('./config/domain.js').sitename;
 const siteLogo = require('./config/domain.js').logo_url;
+let isFederated = require('./config/domain.js').isFederated;
+// if the federation config isn't set, things are federated by default
+if (isFederated === undefined) {
+  isFederated = true;
+}
+const ap = require('./activitypub.js');
 
 // Extra marked renderer (used to render plaintext event description for page metadata)
 // Adapted from https://dustinpfister.github.io/2017/11/19/nodejs-marked/
 // &#63; to ? helper
-htmlEscapeToText = function (text) {
-    return text.replace(/\&\#[0-9]*;|&amp;/g, function (escapeCode) {
-        if (escapeCode.match(/amp/)) {
-            return '&';
-        }
-        return String.fromCharCode(escapeCode.match(/[0-9]+/));
-    });
+function htmlEscapeToText (text) {
+  return text.replace(/\&\#[0-9]*;|&amp;/g, function (escapeCode) {
+    if (escapeCode.match(/amp/)) {
+      return '&';
+    }
+    return String.fromCharCode(escapeCode.match(/[0-9]+/));
+  });
 }
 
-render_plain = function () {
-    var render = new marked.Renderer();
-    // render just the text of a link, strong, em
-    render.link = function (href, title, text) {
-        return text;
-    };
-	render.strong = function(text) {
-		return text;
-	}
-	render.em = function(text) {
-		return text;
-	}
-    // render just the text of a paragraph
-    render.paragraph = function (text) {
-        return htmlEscapeToText(text)+'\r\n';
-    };
-    // render nothing for headings, images, and br
-    render.heading = function (text, level) {
-        return '';
-    };
-    render.image = function (href, title, text) {
-        return '';
-    };
+function render_plain () {
+  var render = new marked.Renderer();
+  // render just the text of a link, strong, em
+  render.link = function (href, title, text) {
+    return text;
+  };
+  render.strong = function(text) {
+    return text;
+  }
+  render.em = function(text) {
+    return text;
+  }
+  // render just the text of a paragraph
+  render.paragraph = function (text) {
+    return htmlEscapeToText(text)+'\r\n';
+  };
+  // render nothing for headings, images, and br
+  render.heading = function (text, level) {
+    return '';
+  };
+  render.image = function (href, title, text) {
+    return '';
+  };
 	render.br = function () {
-		return '';
+    return '';
 	};
-    return render;
+  return render;
 }
 
 const ical = require('ical');
 const icalGenerator = require('ical-generator');
 const cal = icalGenerator({
-	domain: 'gath.io',
-	name: 'Gathio'
+	domain: domain,
+	name: siteName
 });
 
 const sgMail = require('@sendgrid/mail');
@@ -87,17 +97,6 @@ const fileUpload = require('express-fileupload');
 var Jimp = require('jimp');
 router.use(fileUpload());
 
-// LOGGING
-
-function addToLog(process, status, message) {
-	let logEntry = new Log({
-		status: status,
-		process: process,
-		message: message,
-		timestamp: moment()
-	});
-	logEntry.save().catch(() => { console.log("Error saving log entry!") });
-}
 
 // SCHEDULED DELETION
 
@@ -118,23 +117,35 @@ const deleteOldEvents = schedule.scheduleJob('59 23 * * *', function(fireDate){
 				  addToLog("deleteOldEvents", "error", "Image deleted for old event "+event.id);
 				})
 			}
-			Event.remove({"_id": event._id})
-			.then(response => {
-				addToLog("deleteOldEvents", "success", "Old event "+event.id+" deleted");
-			}).catch((err) => {
-				addToLog("deleteOldEvents", "error", "Attempt to delete old event "+event.id+" failed with error: " + err);
-			});
+      // broadcast a Delete profile message to all followers so that at least Mastodon servers will delete their local profile information
+      const guidUpdateObject = crypto.randomBytes(16).toString('hex');
+      const jsonUpdateObject = JSON.parse(event.activityPubActor);
+      const jsonEventObject = JSON.parse(event.activityPubEvent);
+      // first broadcast AP messages, THEN delete from DB
+      ap.broadcastDeleteMessage(jsonUpdateObject, event.followers, event.id, function(statuses) {
+        ap.broadcastDeleteMessage(jsonEventObject, event.followers, event.id, function(statuses) {
+          Event.remove({"_id": event._id})
+          .then(response => {
+            addToLog("deleteOldEvents", "success", "Old event "+event.id+" deleted");
+          }).catch((err) => {
+            addToLog("deleteOldEvents", "error", "Attempt to delete old event "+event.id+" failed with error: " + err);
+          });
+        });
+      });
 		})
 	}).catch((err) => {
 		addToLog("deleteOldEvents", "error", "Attempt to delete old event "+event.id+" failed with error: " + err);
 	});
 });
 
-
 // FRONTEND ROUTES
 
 router.get('/', (req, res) => {
-  res.render('home');
+  res.render('home', {
+    domain: domain,
+    email: contactEmail,
+    siteName: siteName,
+  });
 });
 
 router.get('/new', (req, res) => {
@@ -154,7 +165,11 @@ router.get('/new', (req, res) => {
 //});
 
 router.get('/new/event', (req, res) => {
-	res.render('newevent');
+	res.render('newevent', {
+    domain: domain,
+    email: contactEmail,
+    siteName: siteName,
+  });
 });
 router.get('/new/event/public', (req, res) => {
 	let isPrivate = false;
@@ -180,10 +195,95 @@ router.get('/new/event/public', (req, res) => {
 		isPublic: isPublic,
 		isOrganisation: isOrganisation,
 		isUnknownType: isUnknownType,
-		eventType: 'public'
+		eventType: 'public',
+    domain: domain,
+    email: contactEmail,
+    siteName: siteName,
 	});
 })
 
+// return the JSON for the featured/pinned post for this event
+router.get('/:eventID/featured', (req, res) => {
+  if (!isFederated) return res.sendStatus(404);
+  const {eventID} = req.params;
+  const guidObject = crypto.randomBytes(16).toString('hex');
+  const featured = {
+    "@context": "https://www.w3.org/ns/activitystreams",
+    "id": `https://${domain}/${eventID}/featured`,
+    "type": "OrderedCollection",
+    "orderedItems": [
+      ap.createFeaturedPost(eventID)
+    ]
+  }
+  res.json(featured);
+});
+
+// return the JSON for a given activitypub message
+router.get('/:eventID/m/:hash', (req, res) => {
+  if (!isFederated) return res.sendStatus(404);
+  const {hash, eventID} = req.params;
+  const id = `https://${domain}/${eventID}/m/${hash}`;
+
+  Event.findOne({
+    id: eventID
+  })
+  .then((event) => {
+    if (!event) {
+      res.status(404);
+      res.render('404', { url: req.url });
+    }
+    else {
+      const message = event.activityPubMessages.find(el => el.id === id);
+      if (message) {
+        return res.json(JSON.parse(message.content));
+      }
+      else {
+        res.status(404);
+        return res.render('404', { url: req.url });
+      }
+    }
+  })
+  .catch((err) => {
+    addToLog("getActivityPubMessage", "error", "Attempt to get Activity Pub Message for " + id + " failed with error: " + err);
+    res.status(404);
+    res.render('404', { url: req.url });
+    return;
+  });
+});
+
+// return the webfinger record required for the initial activitypub handshake
+router.get('/.well-known/webfinger', (req, res) => {
+  if (!isFederated) return res.sendStatus(404);
+  let resource = req.query.resource;
+  if (!resource || !resource.includes('acct:')) {
+    return res.status(400).send('Bad request. Please make sure "acct:USER@DOMAIN" is what you are sending as the "resource" query parameter.');
+  }
+  else {
+    // "foo@domain"
+    let activityPubAccount = resource.replace('acct:','');
+    // "foo"
+    let eventID = activityPubAccount.replace(/@.*/,'');
+    Event.findOne({
+      id: eventID
+    })
+    .then((event) => {
+      if (!event) {
+        res.status(404);
+        res.render('404', { url: req.url });
+      }
+      else {
+        res.json(ap.createWebfinger(eventID, domain));
+      }
+    })
+    .catch((err) => {
+      addToLog("renderWebfinger", "error", "Attempt to render webfinger for " + req.params.eventID + " failed with error: " + err);
+      res.status(404);
+      res.render('404', { url: req.url });
+      return;
+    });
+  }
+});
+
 router.get('/:eventID', (req, res) => {
 	Event.findOne({
 		id: req.params.eventID
@@ -191,7 +291,8 @@ router.get('/:eventID', (req, res) => {
 		.populate('eventGroup')
 		.then((event) => {
 			if (event) {
-				parsedLocation = event.location.replace(/\s+/g, '+');
+				const parsedLocation = event.location.replace(/\s+/g, '+');
+				let displayDate;
 				if (moment.tz(event.end, event.timezone).isSame(event.start, 'day')){
 					// Happening during one day
 					displayDate = moment.tz(event.start, event.timezone).format('dddd D MMMM YYYY [<span class="text-muted">from</span>] h:mm a') + moment.tz(event.end, event.timezone).format(' [<span class="text-muted">to</span>] h:mm a [<span class="text-muted">](z)[</span>]');
@@ -199,10 +300,10 @@ router.get('/:eventID', (req, res) => {
 				else {
 					displayDate = moment.tz(event.start, event.timezone).format('dddd D MMMM YYYY [<span class="text-muted">at</span>] h:mm a') + moment.tz(event.end, event.timezone).format(' [<span class="text-muted">–</span>] dddd D MMMM YYYY [<span class="text-muted">at</span>] h:mm a [<span class="text-muted">](z)[</span>]');
 				}
-				eventStartISO = moment.tz(event.start, "Etc/UTC").toISOString();
-				eventEndISO = moment.tz(event.end, "Etc/UTC").toISOString();
-				parsedStart = moment.tz(event.start, event.timezone).format('YYYYMMDD[T]HHmmss');
-				parsedEnd = moment.tz(event.end, event.timezone).format('YYYYMMDD[T]HHmmss');
+				let eventStartISO = moment.tz(event.start, "Etc/UTC").toISOString();
+				let eventEndISO = moment.tz(event.end, "Etc/UTC").toISOString();
+				let parsedStart = moment.tz(event.start, event.timezone).format('YYYYMMDD[T]HHmmss');
+				let parsedEnd = moment.tz(event.end, event.timezone).format('YYYYMMDD[T]HHmmss');
 				let eventHasConcluded = false;
 				if (moment.tz(event.end, event.timezone).isBefore(moment.tz(event.timezone))){
 					eventHasConcluded = true;
@@ -211,11 +312,11 @@ router.get('/:eventID', (req, res) => {
 				if (moment.tz(event.start, event.timezone).isBefore(moment.tz(event.timezone))){
 					eventHasBegun = true;
 				}
-				fromNow = moment.tz(event.start, event.timezone).fromNow();
-				parsedDescription = marked(event.description);
-				eventEditToken = event.editToken;
+				let fromNow = moment.tz(event.start, event.timezone).fromNow();
+				let parsedDescription = marked(event.description);
+				let eventEditToken = event.editToken;
 
-				escapedName = event.name.replace(/\s+/g, '+');
+				let escapedName = event.name.replace(/\s+/g, '+');
 
 				let eventHasCoverImage = false;
 				if( event.image ) {
@@ -247,7 +348,7 @@ router.get('/:eventID', (req, res) => {
 						console.log("No edit token set");
 					}
 					else {
-						if (req.query.e == eventEditToken){
+						if (req.query.e === eventEditToken){
 							editingEnabled = true;
 						}
 						else {
@@ -276,34 +377,43 @@ router.get('/:eventID', (req, res) => {
 				let metadata = {
 					title: event.name,
 					description: marked(event.description, { renderer: render_plain()}).split(" ").splice(0,40).join(" ").trim(),
-					image: (eventHasCoverImage ? 'https://gath.io/events/' + event.image : null),
-					url: 'https://gath.io/' + req.params.eventID
+					image: (eventHasCoverImage ? `https://${domain}/events/` + event.image : null),
+					url: `https://${domain}/` + req.params.eventID
 				};
-				res.set("X-Robots-Tag", "noindex");
-				res.render('event', {
-					title: event.name,
-					escapedName: escapedName,
-					eventData: event,
-					eventAttendees: eventAttendees,
-                    spotsRemaining: spotsRemaining,
-                    noMoreSpots: noMoreSpots,
-					eventStartISO: eventStartISO,
-					eventEndISO: eventEndISO,
-					parsedLocation: parsedLocation,
-					parsedStart: parsedStart,
-					parsedEnd: parsedEnd,
-					displayDate: displayDate,
-					fromNow: fromNow,
-					timezone: event.timezone,
-					parsedDescription: parsedDescription,
-					editingEnabled: editingEnabled,
-					eventHasCoverImage: eventHasCoverImage,
-					eventHasHost: eventHasHost,
-					firstLoad: firstLoad,
-					eventHasConcluded: eventHasConcluded,
-					eventHasBegun: eventHasBegun,
-					metadata: metadata,
-				})
+        if (req.headers.accept && (req.headers.accept.includes('application/activity+json') || req.headers.accept.includes('application/json') || req.headers.accept.includes('application/json+ld'))) {
+          res.json(JSON.parse(event.activityPubActor));
+        }
+        else {
+          res.set("X-Robots-Tag", "noindex");
+          res.render('event', {
+            domain: domain,
+            isFederated: isFederated,
+            email: contactEmail,
+            title: event.name,
+            escapedName: escapedName,
+            eventData: event,
+            eventAttendees: eventAttendees,
+                      spotsRemaining: spotsRemaining,
+                      noMoreSpots: noMoreSpots,
+            eventStartISO: eventStartISO,
+            eventEndISO: eventEndISO,
+            parsedLocation: parsedLocation,
+            parsedStart: parsedStart,
+            parsedEnd: parsedEnd,
+            displayDate: displayDate,
+            fromNow: fromNow,
+            timezone: event.timezone,
+            parsedDescription: parsedDescription,
+            editingEnabled: editingEnabled,
+            eventHasCoverImage: eventHasCoverImage,
+            eventHasHost: eventHasHost,
+            firstLoad: firstLoad,
+            eventHasConcluded: eventHasConcluded,
+            eventHasBegun: eventHasBegun,
+            metadata: metadata,
+            siteName: siteName
+          })
+        }
 			}
 			else {
 				res.status(404);
@@ -320,16 +430,46 @@ router.get('/:eventID', (req, res) => {
 		});
 })
 
+router.get('/:eventID/followers', (req, res) => {
+  if (!isFederated) return res.sendStatus(404);
+  const eventID = req.params.eventID;
+	Event.findOne({
+		id: eventID
+		})
+		.then((event) => {
+			if (event) {
+        const followers = event.followers.map(el => el.actorId);
+        let followersCollection = {
+          "type": "OrderedCollection",
+          "totalItems": followers.length,
+          "id": `https://${domain}/${eventID}/followers`,
+          "first": {
+            "type": "OrderedCollectionPage",
+            "totalItems": followers.length,
+            "partOf": `https://${domain}/${eventID}/followers`,
+            "orderedItems": followers,
+            "id": `https://${domain}/${eventID}/followers?page=1`
+          },
+          "@context":["https://www.w3.org/ns/activitystreams"]
+        };
+        return res.json(followersCollection);
+      }
+      else {
+        return res.status(400).send('Bad request.');
+      }
+    })
+})
+
 router.get('/group/:eventGroupID', (req, res) => {
 	EventGroup.findOne({
 		id: req.params.eventGroupID
 		})
 		.then(async (eventGroup) => {
 			if (eventGroup) {
-				parsedDescription = marked(eventGroup.description);
-				eventGroupEditToken = eventGroup.editToken;
+				let parsedDescription = marked(eventGroup.description);
+				let eventGroupEditToken = eventGroup.editToken;
 
-				escapedName = eventGroup.name.replace(/\s+/g, '+');
+				let escapedName = eventGroup.name.replace(/\s+/g, '+');
 
 				let eventGroupHasCoverImage = false;
 				if( eventGroup.image ) {
@@ -364,7 +504,7 @@ router.get('/group/:eventGroupID', (req, res) => {
 				})
 
 				let upcomingEventsExist = false;
-				if (events.some(e => e.eventHasConcluded == false)) {
+				if (events.some(e => e.eventHasConcluded === false)) {
 					upcomingEventsExist = true;
 				}
 
@@ -384,7 +524,7 @@ router.get('/group/:eventGroupID', (req, res) => {
 						console.log("No edit token set");
 					}
 					else {
-						if (req.query.e == eventGroupEditToken){
+						if (req.query.e === eventGroupEditToken){
 							editingEnabled = true;
 						}
 						else {
@@ -395,11 +535,12 @@ router.get('/group/:eventGroupID', (req, res) => {
 				let metadata = {
 					title: eventGroup.name,
 					description: marked(eventGroup.description, { renderer: render_plain()}).split(" ").splice(0,40).join(" ").trim(),
-					image: (eventGroupHasCoverImage ? 'https://gath.io/events/' + eventGroup.image : null),
-					url: 'https://gath.io/' + req.params.eventID
+					image: (eventGroupHasCoverImage ? `https://${domain}/events/` + eventGroup.image : null),
+					url: `https://${domain}/` + req.params.eventID
 				};
 				res.set("X-Robots-Tag", "noindex");
 				res.render('eventgroup', {
+          domain: domain,
 					title: eventGroup.name,
 					eventGroupData: eventGroup,
 					escapedName: escapedName,
@@ -475,10 +616,13 @@ router.get('/exportevent/:eventID', (req, res) => {
 
 router.post('/newevent', async (req, res) => {
 	let eventID = shortid.generate();
+  // this is a hack, activitypub does not like "-" in ids so we are essentially going
+  // to have a 63-character alphabet instead of a 64-character one
+  eventID = eventID.replace(/-/g,'_');
 	let editToken = randomstring.generate();
 	let eventImageFilename = "";
 	let isPartOfEventGroup = false;
-	if (req.files && Object.keys(req.files).length != 0) {
+	if (req.files && Object.keys(req.files).length !== 0) {
 		let eventImageBuffer = req.files.imageUpload.data;
 		Jimp.read(eventImageBuffer, (err, img) => {
 			if (err) addToLog("Jimp", "error", "Attempt to edit image failed with error: " + err);
@@ -489,8 +633,8 @@ router.post('/newevent', async (req, res) => {
 		});
 		eventImageFilename = eventID + '.jpg';
 	}
-	startUTC = moment.tz(req.body.eventStart, 'D MMMM YYYY, hh:mm a', req.body.timezone);
-	endUTC = moment.tz(req.body.eventEnd, 'D MMMM YYYY, hh:mm a', req.body.timezone);
+	let startUTC = moment.tz(req.body.eventStart, 'D MMMM YYYY, hh:mm a', req.body.timezone);
+	let endUTC = moment.tz(req.body.eventEnd, 'D MMMM YYYY, hh:mm a', req.body.timezone);
 	let eventGroup;
 	if (req.body.eventGroupCheckbox) {
 		eventGroup = await EventGroup.findOne({
@@ -501,6 +645,10 @@ router.post('/newevent', async (req, res) => {
 			isPartOfEventGroup = true;
 		}
 	}
+
+  // generate RSA keypair for ActivityPub
+  let pair = generateRSAKeypair();
+
 	const event = new Event({
 		id: eventID,
 		type: req.body.eventType,
@@ -522,7 +670,12 @@ router.post('/newevent', async (req, res) => {
 		showUsersList: req.body.guestlistCheckbox ? true : false,
 		usersCanComment: req.body.interactionCheckbox ? true : false,
         maxAttendees: req.body.maxAttendees,
-		firstLoad: true
+		firstLoad: true,
+    activityPubActor: ap.createActivityPubActor(eventID, domain, pair.public, marked(req.body.eventDescription), req.body.eventName, req.body.eventLocation, eventImageFilename, startUTC, endUTC, req.body.timezone),
+    activityPubEvent: ap.createActivityPubEvent(req.body.eventName, startUTC, endUTC, req.body.timezone, req.body.eventDescription, req.body.eventLocation),
+    activityPubMessages: [ { id: `https://${domain}/${eventID}/m/featuredPost`, content: JSON.stringify(ap.createFeaturedPost(eventID, req.body.eventName, startUTC, endUTC, req.body.timezone, req.body.eventDescription, req.body.eventLocation)) } ],
+    publicKey: pair.public,
+    privateKey: pair.private
 	});
 	event.save()
 		.then((event) => {
@@ -576,7 +729,7 @@ router.post('/importevent', (req, res) => {
 			location: importedEventData.location,
 			start: importedEventData.start,
 			end: importedEventData.end,
-			timezone: typeof importedEventData.start.tz != 'undefined' ? importedEventData.start.tz : "Etc/UTC",
+			timezone: typeof importedEventData.start.tz !== 'undefined' ? importedEventData.start.tz : "Etc/UTC",
 			description: importedEventData.description,
 			image: '',
 			creatorEmail: creatorEmail,
@@ -628,7 +781,7 @@ router.post('/neweventgroup', (req, res) => {
 	let eventGroupID = shortid.generate();
 	let editToken = randomstring.generate();
 	let eventGroupImageFilename = "";
-	if (req.files && Object.keys(req.files).length != 0) {
+	if (req.files && Object.keys(req.files).length !== 0) {
 		let eventImageBuffer = req.files.imageUpload.data;
 		Jimp.read(eventImageBuffer, (err, img) => {
 			if (err) addToLog("Jimp", "error", "Attempt to edit image failed with error: " + err);
@@ -692,7 +845,7 @@ router.post('/editevent/:eventID/:editToken', (req, res) => {
 			// If there is a new image, upload that first
 			let eventID = req.params.eventID;
 			let eventImageFilename = event.image;
-			if (req.files && Object.keys(req.files).length != 0) {
+			if (req.files && Object.keys(req.files).length !== 0) {
 				let eventImageBuffer = req.files.imageUpload.data;
 				Jimp.read(eventImageBuffer, (err, img) => {
 					if (err) throw err;
@@ -703,19 +856,20 @@ router.post('/editevent/:eventID/:editToken', (req, res) => {
 				});
 				eventImageFilename = eventID + '.jpg';
 			}
-			startUTC = moment.tz(req.body.eventStart, 'D MMMM YYYY, hh:mm a', req.body.timezone);
-			endUTC = moment.tz(req.body.eventEnd, 'D MMMM YYYY, hh:mm a', req.body.timezone);
+			let startUTC = moment.tz(req.body.eventStart, 'D MMMM YYYY, hh:mm a', req.body.timezone);
+			let endUTC = moment.tz(req.body.eventEnd, 'D MMMM YYYY, hh:mm a', req.body.timezone);
 			
-			var isPartOfEventGroup = false;
+			let isPartOfEventGroup = false;
+      let eventGroup;
 			if (req.body.eventGroupCheckbox) {
-				var eventGroup = await EventGroup.findOne({
+				eventGroup = await EventGroup.findOne({
 					id: req.body.eventGroupID,
 					editToken: req.body.eventGroupEditToken
 				})
 				if (eventGroup) {
 					isPartOfEventGroup = true;
 				}
-			}			
+			}
 			const updatedEvent = {
 				name: req.body.eventName,
 				location: req.body.eventLocation,
@@ -730,8 +884,34 @@ router.post('/editevent/:eventID/:editToken', (req, res) => {
 				showUsersList: req.body.guestlistCheckbox ? true : false,
 				usersCanComment: req.body.interactionCheckbox ? true : false,
                 maxAttendees: req.body.maxAttendeesCheckbox ? req.body.maxAttendees : null,
-				eventGroup: isPartOfEventGroup ? eventGroup._id : null
+				eventGroup: isPartOfEventGroup ? eventGroup._id : null,
+        activityPubActor: ap.updateActivityPubActor(JSON.parse(event.activityPubActor), req.body.eventDescription, req.body.eventName, req.body.eventLocation, eventImageFilename, startUTC, endUTC, req.body.timezone),
+        activityPubEvent: ap.updateActivityPubEvent(JSON.parse(event.activityPubEvent), req.body.eventName, req.body.startUTC, req.body.endUTC, req.body.timezone),
 			}
+      let diffText = '<p>This event was just updated with new information.</p><ul>';
+      let displayDate;
+      if (event.name !== updatedEvent.name) {
+        diffText += `<li>the event name changed to ${updatedEvent.name}</li>`;
+      }
+      if (event.location !== updatedEvent.location) {
+        diffText += `<li>the location changed to ${updatedEvent.location}</li>`;
+      }
+      if (event.start.toISOString() !== updatedEvent.start.toISOString()) {
+        displayDate = moment.tz(updatedEvent.start, updatedEvent.timezone).format('dddd D MMMM YYYY h:mm a');
+        diffText += `<li>the start time changed to ${displayDate}</li>`;
+      }
+      if (event.end.toISOString() !== updatedEvent.end.toISOString()) {
+        displayDate = moment.tz(updatedEvent.end, updatedEvent.timezone).format('dddd D MMMM YYYY h:mm a');
+        diffText += `<li>the end time changed to ${displayDate}</li>`;
+      }
+      if (event.timezone !== updatedEvent.timezone) {
+        console.log(typeof event.timezone, JSON.stringify(event.timezone), JSON.stringify(updatedEvent.timezone))
+        diffText += `<li>the time zone changed to ${updatedEvent.timezone}</li>`;
+      }
+      if (event.description !== updatedEvent.description) {
+        diffText += `<li>the event description changed</li>`; 
+      }
+      diffText += `</ul>`;
 			Event.findOneAndUpdate({id: req.params.eventID}, updatedEvent, function(err, raw) {
 				if (err) {
 					addToLog("editEvent", "error", "Attempt to edit event " + req.params.eventID + " failed with error: " + err);
@@ -740,10 +920,47 @@ router.post('/editevent/:eventID/:editToken', (req, res) => {
 			})
 			.then(() => {
 				addToLog("editEvent", "success", "Event " + req.params.eventID + " edited");
+        // send update to ActivityPub subscribers
+        Event.findOne({id: req.params.eventID}, function(err,event) {
+          if (!event) return;
+          let attendees = event.attendees.filter(el => el.id);
+          if (!err) {
+            // broadcast an identical message to all followers, will show in home timeline
+            const guidObject = crypto.randomBytes(16).toString('hex');
+            const jsonObject = {
+              "@context": "https://www.w3.org/ns/activitystreams",
+              "id": `https://${domain}/${req.params.eventID}/m/${guidObject}`,
+              "name": `RSVP to ${event.name}`,
+              "type": "Note",
+              'cc': 'https://www.w3.org/ns/activitystreams#Public',
+              "content": `${diffText} See here: <a href="https://${domain}/${req.params.eventID}">https://${domain}/${req.params.eventID}</a>`,
+            }
+            ap.broadcastCreateMessage(jsonObject, event.followers, eventID)
+            // also broadcast an Update profile message to all followers so that at least Mastodon servers will update the local profile information
+            const jsonUpdateObject = JSON.parse(event.activityPubActor);
+            ap.broadcastUpdateMessage(jsonUpdateObject, event.followers, eventID)
+            // also broadcast an Update/Event for any calendar apps that are consuming our Events
+            const jsonEventObject = JSON.parse(event.activityPubEvent);
+            ap.broadcastUpdateMessage(jsonEventObject, event.followers, eventID)
+
+            // DM to attendees
+            for (const attendee of attendees) {
+                const jsonObject = {
+                "@context": "https://www.w3.org/ns/activitystreams",
+                "name": `RSVP to ${event.name}`,
+                "type": "Note",
+                "content": `<span class=\"h-card\"><a href="${attendee.id}" class="u-url mention">@<span>${attendee.name}</span></a></span> ${diffText} See here: <a href="https://${domain}/${req.params.eventID}">https://${domain}/${req.params.eventID}</a>`,
+                "tag":[{"type":"Mention","href":attendee.id,"name":attendee.name}]
+              }
+              // send direct message to user
+              ap.sendDirectMessage(jsonObject, attendee.id, eventID);
+            }
+          }
+        })
 				if (sendEmails) {
 					Event.findOne({id: req.params.eventID}).distinct('attendees.email', function(error, ids) {
-						attendeeEmails = ids;
-						if (!error && attendeeEmails != ""){
+						let attendeeEmails = ids;
+						if (!error && attendeeEmails !== ""){
 							console.log("Sending emails to: " + attendeeEmails);
               req.app.get('hbsInstance').renderView('./views/emails/editevent.handlebars', {diffText, eventID: req.params.eventID, siteName, siteLogo, domain, cache: true, layout: 'email.handlebars'}, function(err, html) {
                 const msg = {
@@ -794,7 +1011,7 @@ router.post('/editeventgroup/:eventGroupID/:editToken', (req, res) => {
 			// If there is a new image, upload that first
 			let eventGroupID = req.params.eventGroupID;
 			let eventGroupImageFilename = eventGroup.image;
-			if (req.files && Object.keys(req.files).length != 0) {
+			if (req.files && Object.keys(req.files).length !== 0) {
 				let eventImageBuffer = req.files.eventGroupImageUpload.data;
 				Jimp.read(eventImageBuffer, (err, img) => {
 					if (err) throw err;
@@ -820,32 +1037,6 @@ router.post('/editeventgroup/:eventGroupID/:editToken', (req, res) => {
 			})
 			.then(() => {
 				addToLog("editEventGroup", "success", "Event group " + req.params.eventGroupID + " edited");
-				// if (sendEmails) {
-				// 	Event.findOne({id: req.params.eventID}).distinct('attendees.email', function(error, ids) {
-				// 		attendeeEmails = ids;
-				// 		if (!error && attendeeEmails != ""){
-				// 			console.log("Sending emails to: " + attendeeEmails);
-				// 			const msg = {
-				// 				to: attendeeEmails,
-				// 				from: {
-				// 					name: 'Gathio',
-				// 					email: 'notifications@gath.io',
-				// 				},
-				// 				templateId: 'd-e21f3ca49d82476b94ddd8892c72a162',
-				// 				dynamic_template_data: {
-				// 					subject: 'gathio: Event edited',
-				// 					actionType: 'edited',
-				// 					eventExists: true,
-				// 					eventID: req.params.eventID
-				// 				}
-				// 			}
-				// 			sgMail.sendMultiple(msg);
-				// 		}
-				// 		else {
-				// 			console.log("Nothing to send!");
-				// 		}
-				// 	})
-				// }
 				res.writeHead(302, {
 					'Location': '/group/' + req.params.eventGroupID  + '?e=' + req.params.editToken
 					});
@@ -911,6 +1102,36 @@ router.post('/deleteevent/:eventID/:editToken', (req, res) => {
 				eventImage = event.image;
 			}
 
+      // broadcast a Delete profile message to all followers so that at least Mastodon servers will delete their local profile information
+      const guidUpdateObject = crypto.randomBytes(16).toString('hex');
+      const jsonUpdateObject = JSON.parse(event.activityPubActor);
+      // first broadcast AP messages, THEN delete from DB
+      ap.broadcastDeleteMessage(jsonUpdateObject, event.followers, req.params.eventID, function(statuses) {
+        Event.deleteOne({id: req.params.eventID}, function(err, raw) {
+          if (err) {
+            res.send(err);
+            addToLog("deleteEvent", "error", "Attempt to delete event " + req.params.eventID + " failed with error: " + err);
+          }
+        })
+        .then(() => {
+          // Delete image
+          if (eventImage){
+            fs.unlink(global.appRoot + '/public/events/' + eventImage, (err) => {
+              if (err) {
+              res.send(err);
+              addToLog("deleteEvent", "error", "Attempt to delete event image for event " + req.params.eventID + " failed with error: " + err);
+              }
+                // Image removed
+                addToLog("deleteEvent", "success", "Event " + req.params.eventID + " deleted");
+            })
+          }
+          res.writeHead(302, {
+            'Location': '/'
+            });
+          res.end();
+        })
+        .catch((err) => { res.send('Sorry! Something went wrong (error deleting): ' + err); addToLog("deleteEvent", "error", "Attempt to delete event " + req.params.eventID + " failed with error: " + err);});
+      });
 			// Send emails here otherwise they don't exist lol
 			if (sendEmails) {
 				Event.findOne({id: req.params.eventID}).distinct('attendees.email', function(error, ids) {
@@ -932,37 +1153,12 @@ router.post('/deleteevent/:eventID/:editToken', (req, res) => {
                 res.status(500).end();
               });
             });
-					}
-					else {
-						console.log("Nothing to send!");
-					}
-				});
-			}
-
-			Event.deleteOne({id: req.params.eventID}, function(err, raw) {
-				if (err) {
-					res.send(err);
-					addToLog("deleteEvent", "error", "Attempt to delete event " + req.params.eventID + " failed with error: " + err);
-				}
-			})
-			.then(() => {
-				// Delete image
-				if (eventImage){
-					fs.unlink(global.appRoot + '/public/events/' + eventImage, (err) => {
-					  if (err) {
-						res.send(err);
-						addToLog("deleteEvent", "error", "Attempt to delete event image for event " + req.params.eventID + " failed with error: " + err);
-					  }
-					  	// Image removed
-					  	addToLog("deleteEvent", "success", "Event " + req.params.eventID + " deleted");
-					})
-				}
-				res.writeHead(302, {
-					'Location': '/'
-					});
-				res.end();
-			})
-			.catch((err) => { res.send('Sorry! Something went wrong (error deleting): ' + err); addToLog("deleteEvent", "error", "Attempt to delete event " + req.params.eventID + " failed with error: " + err);});
+            }
+          else {
+            console.log("Nothing to send!");
+          }
+        });
+      }
 		}
 		else {
 			// Token doesn't match
@@ -1039,6 +1235,7 @@ router.post('/attendevent/:eventID', (req, res) => {
 	Event.findOne({
 		id: req.params.eventID,
 		}, function(err,event) {
+    if (!event) return;
 		event.attendees.push(newAttendee);
 		event.save()
 		.then(() => {
@@ -1107,6 +1304,49 @@ router.post('/unattendevent/:eventID', (req, res) => {
 	});
 });
 
+// this is a one-click unattend that requires a secret URL that only the person who RSVPed over
+// activitypub knows
+router.get('/oneclickunattendevent/:eventID/:attendeeID', (req, res) => {
+  // Mastodon will "click" links that sent to its users, presumably as a prefetch?
+  // Anyway, this ignores the automated clicks that are done without the user's knowledge
+  if (req.headers['user-agent'] && req.headers['user-agent'].includes('Mastodon')) {
+    return res.sendStatus(200);
+  }
+	Event.update(
+	    { id: req.params.eventID },
+	    { $pull: { attendees: { _id: req.params.attendeeID } } }
+	)
+	.then(response => {
+		addToLog("oneClickUnattend", "success", "Attendee removed via one click unattend " + req.params.eventID);
+		if (sendEmails) {
+      // currently this is never called because we don't have the email address
+			if (req.body.attendeeEmail){
+        req.app.get('hbsInstance').renderView('./views/emails/removeeventattendee.handlebars', {eventName: req.params.eventName, siteName, domain, cache: true, layout: 'email.handlebars'}, function(err, html) { const msg = {
+            to: req.body.attendeeEmail,
+            from: {
+              name: siteName,
+              email: contactEmail,
+            },
+						subject: `${siteName}: You have been removed from an event`,
+            html,
+          };
+          sgMail.send(msg).catch(e => {
+            console.error(e.toString());
+            res.status(500).end();
+          });
+        });
+			}
+		}
+		res.writeHead(302, {
+			'Location': '/' + req.params.eventID
+			});
+		res.end();
+	})
+	.catch((err) => {
+		res.send('Database error, please try again :('); addToLog("removeEventAttendee", "error", "Attempt to remove attendee by admin from event " + req.params.eventID + " failed with error: " + err);
+	});
+});
+
 router.post('/removeattendee/:eventID/:attendeeID', (req, res) => {
 	Event.update(
 	    { id: req.params.eventID },
@@ -1156,13 +1396,26 @@ router.post('/post/comment/:eventID', (req, res) => {
 	Event.findOne({
 		id: req.params.eventID,
 		}, function(err,event) {
+    if (!event) return;
 		event.comments.push(newComment);
 		event.save()
 		.then(() => {
 			addToLog("addEventComment", "success", "Comment added to event " + req.params.eventID);
+      // broadcast an identical message to all followers, will show in their home timeline
+      // and in the home timeline of the event
+      const guidObject = crypto.randomBytes(16).toString('hex');
+      const jsonObject = {
+        "@context": "https://www.w3.org/ns/activitystreams",
+        "id": `https://${domain}/${req.params.eventID}/m/${guidObject}`,
+        "name": `Comment on ${event.name}`,
+        "type": "Note",
+        'cc': 'https://www.w3.org/ns/activitystreams#Public',
+        "content": `<p>${req.body.commentAuthor} commented: ${req.body.commentContent}.</p><p><a href="https://${domain}/${req.params.eventID}/">See the full conversation here.</a></p>`,
+      }
+      ap.broadcastCreateMessage(jsonObject, event.followers, req.params.eventID)
 			if (sendEmails) {
 				Event.findOne({id: req.params.eventID}).distinct('attendees.email', function(error, ids) {
-				attendeeEmails = ids;
+				let attendeeEmails = ids;
 					if (!error){
 						console.log("Sending emails to: " + attendeeEmails);
             req.app.get('hbsInstance').renderView('./views/emails/addeventcomment.handlebars', {siteName, siteLogo, domain, eventID: req.params.eventID, commentAuthor: req.body.commentAuthor, cache: true, layout: 'email.handlebars'}, function(err, html) {
@@ -1207,14 +1460,26 @@ router.post('/post/reply/:eventID/:commentID', (req, res) => {
 	Event.findOne({
 		id: req.params.eventID,
 		}, function(err,event) {
+      if (!event) return;
 			var parentComment = event.comments.id(commentID);
 			parentComment.replies.push(newReply);
 			event.save()
 			.then(() => {
 				addToLog("addEventReply", "success", "Reply added to comment " + commentID + " in event " + req.params.eventID);
+        // broadcast an identical message to all followers, will show in their home timeline
+        const guidObject = crypto.randomBytes(16).toString('hex');
+        const jsonObject = {
+          "@context": "https://www.w3.org/ns/activitystreams",
+          "id": `https://${domain}/${req.params.eventID}/m/${guidObject}`,
+          "name": `Comment on ${event.name}`,
+          "type": "Note",
+          'cc': 'https://www.w3.org/ns/activitystreams#Public',
+          "content": `<p>${req.body.replyAuthor} commented: ${req.body.replyContent}</p><p><a href="https://${domain}/${req.params.eventID}/">See the full conversation here.</a></p>`,
+        }
+        ap.broadcastCreateMessage(jsonObject, event.followers, req.params.eventID)
 				if (sendEmails) {
 					Event.findOne({id: req.params.eventID}).distinct('attendees.email', function(error, ids) {
-						attendeeEmails = ids;
+						let attendeeEmails = ids;
 						if (!error){
 							console.log("Sending emails to: " + attendeeEmails);
               req.app.get('hbsInstance').renderView('./views/emails/addeventcomment.handlebars', {siteName, siteLogo, domain, eventID: req.params.eventID, commentAuthor: req.body.replyAuthor, cache: true, layout: 'email.handlebars'}, function(err, html) {
@@ -1275,6 +1540,67 @@ router.post('/deletecomment/:eventID/:commentID/:editToken', (req, res) => {
 	.catch((err) => { res.send('Sorry! Something went wrong: ' + err); addToLog("deleteComment", "error", "Attempt to delete comment " + req.params.commentID + "from event " + req.params.eventID + " failed with error: " + err);});
 });
 
+router.post('/activitypub/inbox', (req, res) => {
+  if (!isFederated) return res.sendStatus(404);
+  // validate the incoming message
+  const signature = req.get('Signature');
+  let signature_header = signature.split(',').map(pair => {
+    return pair.split('=').map(value => {
+      return value.replace(/^"/g, '').replace(/"$/g, '') 
+    });
+  }).reduce((acc, el) => {
+    acc[el[0]] = el[1];
+    return acc;
+  }, {});
+
+  // get the actor
+  // TODO if this is a Delete for an Actor this won't work
+  request({
+    url: signature_header.keyId,
+    headers: {
+      'Accept': 'application/activity+json',
+      'Content-Type': 'application/activity+json'
+    }}, function (error, response, actor) {
+    let publicKey = '';
+
+    try {
+      if (JSON.parse(actor).publicKey) {
+        publicKey = JSON.parse(actor).publicKey.publicKeyPem;
+      }
+    }
+    catch(err) {
+      return res.status(500).send('Actor could not be parsed' + err);
+    }
+
+    let comparison_string = signature_header.headers.split(' ').map(header => {
+      if (header === '(request-target)') {
+        return '(request-target): post /activitypub/inbox';
+      }
+      else {
+        return `${header}: ${req.get(header)}`
+      }
+    }).join('\n');
+
+    const verifier = crypto.createVerify('RSA-SHA256')
+    verifier.update(comparison_string, 'ascii')
+    const publicKeyBuf = new Buffer(publicKey, 'ascii')
+    const signatureBuf = new Buffer(signature_header.signature, 'base64')
+    try {
+      const result = verifier.verify(publicKeyBuf, signatureBuf)
+      if (result) {
+        // actually process the ActivityPub message now that it's been verified
+        ap.processInbox(req, res);
+      }
+      else {
+        return res.status(401).send('Signature could not be verified.');
+      }
+    }
+    catch(err) {
+      return res.status(401).send('Signature could not be verified: ' + err);
+    }
+  });
+});
+
 router.use(function(req, res, next){
 	res.status(404);
 	res.render('404', { url: req.url });
diff --git a/start.js b/start.js
index b47d73c..1a001d3 100755
--- a/start.js
+++ b/start.js
@@ -5,6 +5,7 @@ const path = require('path');
 const mongoose = require('mongoose');
 
 const databaseCredentials = require('./config/database.js');
+const port = require('./config/domain.js').port;
 
 mongoose.connect(databaseCredentials.url, { useNewUrlParser: true });
 mongoose.set('useCreateIndex', true);
@@ -26,6 +27,6 @@ const app = require('./app');
 
 global.appRoot = path.resolve(__dirname);
 
-const server = app.listen(3000, () => {
+const server = app.listen(port, () => {
   console.log(`Welcome to gathio! The app is now running on http://localhost:${server.address().port}`);
 });
diff --git a/views/event.handlebars b/views/event.handlebars
index 842239f..52a68bc 100755
--- a/views/event.handlebars
+++ b/views/event.handlebars
@@ -67,11 +67,22 @@
 						<span class="fa-li">
 							<i class="fas fa-fw fa-share-square"></i>
 						</span>
-						<a href="https://gath.io/{{eventData.id}}">gath.io/{{eventData.id}}</a>
-						<button type="button" id="copyEventLink" class="eventInformationAction btn btn-outline-secondary btn-sm" data-clipboard-text="https://gath.io/{{eventData.id}}">
+						<a href="https://{{domain}}/{{eventData.id}}">{{domain}}/{{eventData.id}}</a>
+						<button type="button" id="copyEventLink" class="eventInformationAction btn btn-outline-secondary btn-sm" data-clipboard-text="https://{{domain}}/{{eventData.id}}">
 							<i class="fas fa-copy"></i> Copy
 						</button>
 					</li>
+          {{#if isFederated}}
+          <li>
+            <span class="fa-li">
+              <i class="fas fa-fw fa-share-square"></i>
+            </span>
+            @{{eventData.id}}@{{domain}}
+            <button type="button" id="copyAPLink" class="eventInformationAction btn btn-outline-secondary btn-sm" data-clipboard-text="@{{eventData.id}}@{{domain}}">
+              <i class="fas fa-copy"></i> Copy
+            </button>
+          </li>
+          {{/if}}
 				</ul>
 			</div>
 		</div>
@@ -135,7 +146,7 @@
 		{{#if eventAttendees}}
 			<ul class="attendeesList">
 				{{#each eventAttendees}}
-					<li{{#if ../editingEnabled}} data-attendee-name="{{this.name}}" data-attendee-id="{{this._id}}"{{/if}}><span class="attendee-name">{{this.name}}</span>{{#if ../editingEnabled}} <a href="#" class="remove-attendee" data-toggle="modal" data-target="#removeAttendeeModal" title="Remove user from event"><i class="fas fa-user-times"></i></a>{{/if}}</li>
+					<li{{#if ../editingEnabled}} data-attendee-name="{{this.name}}" data-attendee-id="{{this._id}}"{{/if}}>{{#if this.email}}<span class="attendee-name">{{this.name}}</span>{{else}}<a href="{{this.id}}"><span class="attendee-name">{{this.name}}</span></a>{{/if}}{{#if ../editingEnabled}} <a href="#" class="remove-attendee" data-toggle="modal" data-target="#removeAttendeeModal" title="Remove user from event"><i class="fas fa-user-times"></i></a>{{/if}}</li>
 				{{/each}}
 			</ul>
 		{{else}}
@@ -259,7 +270,11 @@
 				<div class="comment">
 					<div class="row commentContainer">
 						<div class="col-lg commentText">
-							<p class="mb-0"><strong>{{this.author}}</strong> <small class="commentTimestamp text-muted">{{this.timestamp}}</small></p>
+              {{#if this.actorId}}
+                <p class="mb-0"><a href="{{this.actorId}}"><strong>{{this.author}}</strong></a> <a href="{{this.activityId}}"><small class="commentTimestamp text-muted">{{this.timestamp}}</small></a></p>
+              {{else}}
+                <p class="mb-0"><strong>{{this.author}}</strong> <small class="commentTimestamp text-muted">{{this.timestamp}}</small></p>
+              {{/if}}
 							<p>{{this.content}}</p>
 							{{#if this.replies}}
 								<hr>
@@ -440,6 +455,11 @@
 			$(this).html('<i class="fas fa-copy"></i> Copied!');
 			setTimeout(function(){ $("#copyEventLink").html('<i class="fas fa-copy"></i> Copy');}, 5000);
 		})
+		new ClipboardJS('#copyAPLink');
+		$("#copyAPLink").click(function(){
+			$(this).html('<i class="fas fa-copy"></i> Copied!');
+			setTimeout(function(){ $("#copyAPLink").html('<i class="fas fa-copy"></i> Copy');}, 5000);
+		})
 		$(".daysToDeletion").html(moment("{{eventEndISO}}").add(7, 'days').fromNow());
 		if ($("#joinCheckbox").is(':checked')){
 			$("#maxAttendeesCheckboxContainer").css("display","flex");
diff --git a/views/eventgroup.handlebars b/views/eventgroup.handlebars
index 00bae2c..dffb847 100755
--- a/views/eventgroup.handlebars
+++ b/views/eventgroup.handlebars
@@ -49,10 +49,10 @@
 				<span class="fa-li">
 					<i class="fas fa-share-square"></i>
 				</span>
-				<a href="https://gath.io/group/{{eventGroupData.id}}">
-					gath.io/group/{{eventGroupData.id}}
+				<a href="https://{{domain}}/group/{{eventGroupData.id}}">
+					{{domain}}/group/{{eventGroupData.id}}
 				</a>
-				<button type="button" id="copyEventLink" class="eventInformationAction btn btn-outline-secondary btn-sm" data-clipboard-text="https://gath.io/group/{{eventGroupData.id}}">
+				<button type="button" id="copyEventLink" class="eventInformationAction btn btn-outline-secondary btn-sm" data-clipboard-text="https://{{domain}}/group/{{eventGroupData.id}}">
 					<i class="fas fa-copy"></i> Copy
 				</button>
 			</li>
diff --git a/views/home.handlebars b/views/home.handlebars
index c1a610f..164250c 100755
--- a/views/home.handlebars
+++ b/views/home.handlebars
@@ -1,4 +1,4 @@
-<h1>Organise all the things</h1>
+<h1>{{siteName}}</h1>
 
 <p class="lead">
   <strong>gath<span class="text-muted">io</span></strong> is a quick and easy way to make and share events which respects your privacy.
diff --git a/views/layouts/main.handlebars b/views/layouts/main.handlebars
index 4f0cfbc..d7c3bf2 100755
--- a/views/layouts/main.handlebars
+++ b/views/layouts/main.handlebars
@@ -17,17 +17,17 @@
 		<meta property="og:image:width" content="260">
 		<meta property="og:image:height" content="260">
 		<meta property="og:description" content="{{#if metadata.description}}{{metadata.description}}{{else}}An easier, quicker, and much less privacy-invading way to make and share events{{/if}}">
-		<meta property="og:title" content="{{#if metadata.title}}{{metadata.title}} &middot; gathio{{else}}gathio{{/if}}">
-		<meta property="og:url" content="{{#if metadata.url}}{{metadata.url}}{{else}}https://gath.io/{{/if}}">
-		<meta property="og:image" content="{{#if metadata.image}}{{metadata.image}}{{else}}http://gath.io/og-image.jpg{{/if}}">
+		<meta property="og:title" content="{{#if metadata.title}}{{metadata.title}} &middot; {{siteName}}{{else}}{{siteName}}{{/if}}">
+		<meta property="og:url" content="{{#if metadata.url}}{{metadata.url}}{{else}}https://{{domain}}/{{/if}}">
+		<meta property="og:image" content="{{#if metadata.image}}{{metadata.image}}{{else}}http://{{domain}}/og-image.jpg{{/if}}">
 
 		<meta name="twitter:card" content="summary">
-		<meta name="twitter:title" content="{{#if metadata.title}}{{metadata.title}} &middot; gathio{{else}}gathio{{/if}}">
+		<meta name="twitter:title" content="{{#if metadata.title}}{{metadata.title}} &middot; {{siteName}}{{else}}{{siteName}}{{/if}}">
 		<meta name="twitter:description" content="{{#if metadata.description}}{{metadata.description}}{{else}}An easier, quicker, and much less privacy-invading way to make and share events{{/if}}">
-		<meta name="twitter:image" content="{{#if metadata.image}}{{metadata.image}}{{else}}http://gath.io/og-image.jpg{{/if}}">
+		<meta name="twitter:image" content="{{#if metadata.image}}{{metadata.image}}{{else}}http://{{domain}}/og-image.jpg{{/if}}">
 
 
-		<title>{{#if title}}{{title}} &middot; {{/if}}gathio</title>
+		<title>{{#if title}}{{title}} &middot; {{/if}}{{siteName}}</title>
 
 		<!-- FONTS -->
 
@@ -73,7 +73,7 @@
 					</div>
 					<div id="footerContainer">
 						<small class="text-muted">
-							<a href="https://github.com/lowercasename/gathio">GitHub</a> &middot; Made with <i class="far fa-heart"></i> by <a href="http://raphaelkabo.com">Raphael</a> &middot; Need help? <a href="mailto:support@gath.io">Email us</a>.<br />
+							<a href="https://github.com/lowercasename/gathio">GitHub</a> &middot; Made with <i class="far fa-heart"></i> by <a href="http://raphaelkabo.com">Raphael</a> &middot; Need help? <a href="mailto:{{email}}">Email us</a>.<br />
 							If you like gathio, you might like <strong><a href="http://sweet.sh/" style="color:#ed5e5e;">sweet</a></strong>, my utopian social network.
 						</small>
 					</div>
diff --git a/views/partials/neweventgroupform.handlebars b/views/partials/neweventgroupform.handlebars
index 20dd832..fddc795 100755
--- a/views/partials/neweventgroupform.handlebars
+++ b/views/partials/neweventgroupform.handlebars
@@ -1,6 +1,6 @@
 <h4 class="mb-2">Create an event group</h4>
 <p>An event group is a holding area for a set of linked events, like a series of film nights, a festival, or a band tour. You can share a public link to your event group just like an individual event link, and people who know the secret editing code (sent in an email when you create the event group) will be able to add future events to the group.</p>
-<p>Event groups do not get automatically removed like events do, but events which have been removed from Gathio will of course not show up in an event group.</p>
+<p>Event groups do not get automatically removed like events do, but events which have been removed from {{siteName}} will of course not show up in an event group.</p>
 <form id="newEventForm" action="/neweventgroup" method="post" enctype="multipart/form-data">
   <div class="form-group row">
     <label for="eventGroupName" class="col-sm-2 col-form-label">Event group name</label>