From 6d7ba58f880be618ade07f8ea080fe8c4bf8a896 Mon Sep 17 00:00:00 2001
From: cyfraeviolae <cyfraeviolae>
Date: Wed, 3 Apr 2024 03:10:44 -0400
Subject: venv

---
 .../site-packages/litestar/security/jwt/token.py   | 119 +++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 venv/lib/python3.11/site-packages/litestar/security/jwt/token.py

(limited to 'venv/lib/python3.11/site-packages/litestar/security/jwt/token.py')

diff --git a/venv/lib/python3.11/site-packages/litestar/security/jwt/token.py b/venv/lib/python3.11/site-packages/litestar/security/jwt/token.py
new file mode 100644
index 0000000..279111a
--- /dev/null
+++ b/venv/lib/python3.11/site-packages/litestar/security/jwt/token.py
@@ -0,0 +1,119 @@
+from __future__ import annotations
+
+import dataclasses
+from dataclasses import asdict, dataclass, field
+from datetime import datetime, timezone
+from typing import TYPE_CHECKING, Any
+
+from jose import JWSError, JWTError, jwt
+
+from litestar.exceptions import ImproperlyConfiguredException, NotAuthorizedException
+
+if TYPE_CHECKING:
+    from typing_extensions import Self
+
+
+__all__ = ("Token",)
+
+
+def _normalize_datetime(value: datetime) -> datetime:
+    """Convert the given value into UTC and strip microseconds.
+
+    Args:
+        value: A datetime instance
+
+    Returns:
+        A datetime instance
+    """
+    if value.tzinfo is not None:
+        value.astimezone(timezone.utc)
+
+    return value.replace(microsecond=0)
+
+
+@dataclass
+class Token:
+    """JWT Token DTO."""
+
+    exp: datetime
+    """Expiration - datetime for token expiration."""
+    sub: str
+    """Subject - usually a unique identifier of the user or equivalent entity."""
+    iat: datetime = field(default_factory=lambda: _normalize_datetime(datetime.now(timezone.utc)))
+    """Issued at - should always be current now."""
+    iss: str | None = field(default=None)
+    """Issuer - optional unique identifier for the issuer."""
+    aud: str | None = field(default=None)
+    """Audience - intended audience."""
+    jti: str | None = field(default=None)
+    """JWT ID - a unique identifier of the JWT between different issuers."""
+    extras: dict[str, Any] = field(default_factory=dict)
+    """Extra fields that were found on the JWT token."""
+
+    def __post_init__(self) -> None:
+        if len(self.sub) < 1:
+            raise ImproperlyConfiguredException("sub must be a string with a length greater than 0")
+
+        if isinstance(self.exp, datetime) and (
+            (exp := _normalize_datetime(self.exp)).timestamp()
+            >= _normalize_datetime(datetime.now(timezone.utc)).timestamp()
+        ):
+            self.exp = exp
+        else:
+            raise ImproperlyConfiguredException("exp value must be a datetime in the future")
+
+        if isinstance(self.iat, datetime) and (
+            (iat := _normalize_datetime(self.iat)).timestamp()
+            <= _normalize_datetime(datetime.now(timezone.utc)).timestamp()
+        ):
+            self.iat = iat
+        else:
+            raise ImproperlyConfiguredException("iat must be a current or past time")
+
+    @classmethod
+    def decode(cls, encoded_token: str, secret: str | dict[str, str], algorithm: str) -> Self:
+        """Decode a passed in token string and returns a Token instance.
+
+        Args:
+            encoded_token: A base64 string containing an encoded JWT.
+            secret: The secret with which the JWT is encoded. It may optionally be an individual JWK or JWS set dict
+            algorithm: The algorithm used to encode the JWT.
+
+        Returns:
+            A decoded Token instance.
+
+        Raises:
+            NotAuthorizedException: If the token is invalid.
+        """
+        try:
+            payload = jwt.decode(token=encoded_token, key=secret, algorithms=[algorithm], options={"verify_aud": False})
+            exp = datetime.fromtimestamp(payload.pop("exp"), tz=timezone.utc)
+            iat = datetime.fromtimestamp(payload.pop("iat"), tz=timezone.utc)
+            field_names = {f.name for f in dataclasses.fields(Token)}
+            extra_fields = payload.keys() - field_names
+            extras = payload.pop("extras", {})
+            for key in extra_fields:
+                extras[key] = payload.pop(key)
+            return cls(exp=exp, iat=iat, **payload, extras=extras)
+        except (KeyError, JWTError, ImproperlyConfiguredException) as e:
+            raise NotAuthorizedException("Invalid token") from e
+
+    def encode(self, secret: str, algorithm: str) -> str:
+        """Encode the token instance into a string.
+
+        Args:
+            secret: The secret with which the JWT is encoded.
+            algorithm: The algorithm used to encode the JWT.
+
+        Returns:
+            An encoded token string.
+
+        Raises:
+            ImproperlyConfiguredException: If encoding fails.
+        """
+        try:
+            return jwt.encode(
+                claims={k: v for k, v in asdict(self).items() if v is not None}, key=secret, algorithm=algorithm
+            )
+        except (JWTError, JWSError) as e:
+            raise ImproperlyConfiguredException("Failed to encode token") from e
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