Add auth router

src/core/config.py

@@ -29,6 +29,8 @@ class Config(BaseModel):
 
     REDIS_URI: str
 
+    WEB_APP_HOST: str
+
 
 def get_config() -> Config:
     settings = Settings()  # type: ignore

src/modules/web_app/views/auth.py

@@ -1,5 +1,46 @@
 from fastapi import APIRouter
 
+from httpx_oauth.oauth2 import OAuth2
 
-auth_router = APIRouter()
+from core.config import config
 
+
+auth_router = APIRouter(prefix="/auth", tags=["auth"])
+
+
+twitch_oauth = OAuth2(
+    config.TWITCH_CLIENT_ID,
+    config.TWITCH_CLIENT_SECRET,
+    "https://id.twitch.tv/oauth2/authorize",
+    "https://id.twitch.tv/oauth2/token",
+)
+
+
+REDIRECT_URI_TEMPLATE = f"https://{config.WEB_APP_HOST}/" + "auth/callback/{service}/"
+
+
+@auth_router.get("/get_authorization_url/{service}/")
+async def get_authorization_url(service: str):
+    link = None
+
+    if service == "twitch":
+        link = await twitch_oauth.get_authorization_url(
+            redirect_uri=REDIRECT_URI_TEMPLATE.format(service="twitch"),
+        )
+
+    return {"link": link}
+
+
+@auth_router.get("/callback/{service}/")
+async def callback(service: str, code: str):
+    user_data = None
+
+    if service == "twitch":
+        token = await twitch_oauth.get_access_token(
+            code,
+            redirect_uri=REDIRECT_URI_TEMPLATE.format(service="twitch"),
+        )
+
+        user_data = await twitch_oauth.get_id_email(token["access_token"])
+
+    return {"user_data": user_data}