add JWT authentication

How to

• Use JWTAuthPlugin and annotate parameters with JWTAuthParam.
• Use OAuth2PasswordFlow for token acquisition and return a profile to be encoded as JWT.

Example

from typing import Annotated, Literal
from msgspec import Struct, field
from lihil import Route
from lihil.plugins.auth.jwt import JWTAuthParam, JWTAuthPlugin
from lihil.plugins.auth.oauth import OAuth2PasswordFlow, OAuthLoginForm

me = Route("/me")
token = Route("/token")

jwt_auth_plugin = JWTAuthPlugin(jwt_secret="mysecret", jwt_algorithms="HS256")

class UserProfile(Struct):
    user_id: str = field(name="sub")
    role: Literal["admin", "user"] = "user"

@me.get(auth_scheme=OAuth2PasswordFlow(token_url="token"), plugins=[jwt_auth_plugin.decode_plugin()])
async def get_user(profile: Annotated[UserProfile, JWTAuthParam]):
    return {"sub": profile.user_id}

@token.post(plugins=[jwt_auth_plugin.encode_plugin(expires_in_s=3600)])
async def login_get_token(credentials: OAuthLoginForm) -> UserProfile:
    return UserProfile(user_id="user123")

References

• advance/plugin/jwt.md:1