feat: Add generic OIDC authentication provider (#3760)

lnbits/core/models/sso/__init__.py

@@ -0,0 +1 @@
+"""SSO authentication providers for LNbits"""

lnbits/core/models/sso/oidc.py

@@ -0,0 +1,36 @@
+"""Generic OIDC SSO Login Helper"""
+
+from typing import Optional
+
+import httpx
+from fastapi_sso.sso.base import DiscoveryDocument, OpenID, SSOBase
+
+
+class OidcSSO(SSOBase):
+    """Class providing login via Generic OIDC OAuth (e.g., Zitadel, Authentik, etc.)"""
+
+    provider = "oidc"
+    scope = ["openid", "email", "profile"]
+    discovery_url = ""
+
+    async def openid_from_response(
+        self, response: dict, session: Optional["httpx.AsyncClient"] = None
+    ) -> OpenID:
+        """Return OpenID from user information provided by OIDC provider"""
+        return OpenID(
+            email=response.get("email", ""),
+            provider=self.provider,
+            id=response.get("sub"),
+            first_name=response.get("given_name"),
+            last_name=response.get("family_name"),
+            display_name=response.get("name") or response.get("preferred_username"),
+            picture=response.get("picture"),
+        )
+
+    async def get_discovery_document(self) -> DiscoveryDocument:
+        """Get document containing handy urls"""
+        async with httpx.AsyncClient() as session:
+            response = await session.get(self.discovery_url)
+            content = response.json()
+
+            return content