From 2937c50572e734da6dd51c22c1645124d1c8224e Mon Sep 17 00:00:00 2001
From: cyfraeviolae <cyfraeviolae>
Date: Wed, 3 Apr 2024 03:58:43 -0400
Subject: ics

---
 app.py | 41 +++++++++++++++++++++++++++++++----------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/app.py b/app.py
index 2cfc8e8..925ec27 100644
--- a/app.py
+++ b/app.py
@@ -6,6 +6,7 @@ import secrets
 import random
 from enum import Enum
 from dataclasses import dataclass
+import io
 import datetime
 from contextlib import asynccontextmanager
 from typing import Any
@@ -22,14 +23,19 @@ from litestar.contrib.jinja import JinjaTemplateEngine
 from litestar.exceptions import HTTPException
 from litestar.template.config import TemplateConfig
 from litestar.response import Template, Redirect
+from litestar.response.file import ASGIFileResponse
+from litestar.response.streaming import ASGIStreamingResponse
 from litestar.static_files import create_static_files_router
 from litestar.enums import RequestEncodingType
 from litestar.params import Body
 from litestar import Request
 from litestar.datastructures import State
 
-# automake calendar invite ics
+import ics
+
+# TODO admin remove attendees
 # use url_fors, timezones?
+# error handling, auth errors, sql errors, input validation
 
 class Base(DeclarativeBase):
     pass
@@ -57,6 +63,16 @@ class Event(Base):
     def get_invites(self):
         return json.loads(self.invites)
 
+    def to_ics(self):
+        c = ics.Calendar()
+        e = ics.Event()
+        e.name = self.title
+        e.begin = self.time
+        e.location = self.location
+        e.description = self.description
+        c.events.add(e)
+        return c
+
 @asynccontextmanager
 async def db_connection(app: Litestar) -> AsyncGenerator[None, None]:
     engine = getattr(app.state, "engine", None)
@@ -85,14 +101,6 @@ parts = [
 def gen_iden():
     return "-".join(random.choices(parts, k=8))
 
-iden = 'Weave-Stream-Limber-Exalted-Sluice-Reaper-Myrtle-Incite'
-
-title =  'Hot Pot at the Cafe Cyfrae Violae'
-when = datetime.datetime.fromisoformat("2024-04-07T13:00:00")
-where =  '133 E 4th St, Apt 6, New York NY 10003'
-what = "Hot pot, Anxi oolong, baijiu, Hua Zhou."
-EVENTS = {}
-
 @get("/")
 async def index() -> Template:
     return Template(template_name="index.html")
@@ -112,6 +120,19 @@ async def event(state: State, iden: str, password: str = "") -> Template:
     context = dict(event=event, manage=manage)
     return Template(template_name="event.html", context=context)
 
+@get("/calendar/{iden:str}")
+async def calendar(state: State, iden: str) -> ASGIStreamingResponse:
+    async with sessionmaker(bind=state.engine) as session:
+        async with session.begin():
+            query = select(Event).where(Event.iden == iden)
+            result = await session.execute(query)
+            event = result.scalar_one()
+    ics = event.to_ics()
+    f = io.StringIO(ics.serialize())
+    return ASGIStreamingResponse(iterator=f, media_type='application/octet-stream', headers={
+        'Content-Disposition': 'inline; filename=event.ics',
+    })
+
 @dataclass
 class EditRequest:
     title: str
@@ -164,7 +185,6 @@ async def join(state: State, request: Request, iden: str, data: Annotated[JoinRe
             result = await session.execute(query)
             event = result.scalar_one()
             name = data.name
-            # TODO if name exists reject
             invites = json.loads(event.invites)
             invites.append(name)
             event.invites = json.dumps(invites)
@@ -177,6 +197,7 @@ app = Litestar(
     route_handlers=[
         index,
         event,
+        calendar,
         create,
         edit,
         join,
-- 
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