fix MPP-3805: get FxA SocialApp from DB at startup

privaterelay/apps.py

@@ -2,7 +2,7 @@
 import json
 import os
 from pathlib import Path
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
 from django.apps import AppConfig
 from django.conf import settings
@@ -13,6 +13,10 @@
 ROOT_DIR = os.path.abspath(os.curdir)
 
 
+if TYPE_CHECKING:
+    from allauth.socialaccount.models import SocialApp
+
+
 def get_profiler_startup_data() -> tuple[str | None, str | None]:
     from .utils import get_version_info
 
@@ -81,6 +85,7 @@ def ready(self) -> None:
 
         try:
             del self.fxa_verifying_keys  # Clear cache
+            del self.fxa_social_app  # Clear cache
         except AttributeError:
             pass
 
@@ -93,3 +98,9 @@ def fxa_verifying_keys(self) -> list[dict[str, Any]]:
             keys: list[dict[str, Any]] = resp.json()["keys"]
             return keys
         return []
+
+    @cached_property
+    def fxa_social_app(self) -> "SocialApp":
+        from allauth.socialaccount.models import SocialApp
+
+        return SocialApp.objects.get(provider="fxa")

privaterelay/tests/views_tests.py

@@ -237,7 +237,7 @@ def setup_fxa_rp_events(
     profile.save()
 
     # Create FxA app, account, token, etc.
-    fxa_app: SocialApp = baker.make(SocialApp, provider="fxa")
+    fxa_app: SocialApp = baker.make(SocialApp, provider="fxa", client_id="test-fxa")
     fxa_profile_data = {
         "email": user.email,
         "locale": "en-US,en;q=0.5",

privaterelay/views.py

@@ -165,6 +165,15 @@ def fxa_verifying_keys(reload: bool = False) -> list[dict[str, Any]]:
     return private_relay_config.fxa_verifying_keys
 
 
+def fxa_social_app(reload: bool = False) -> SocialApp:
+    """Get FxA SocialApp from app config or DB."""
+    private_relay_config = apps.get_app_config("privaterelay")
+    assert isinstance(private_relay_config, PrivateRelayConfig)
+    if reload:
+        private_relay_config.ready()
+    return private_relay_config.fxa_social_app
+
+
 class FxAEvent(TypedDict):
     """
     FxA Security Event Token (SET) payload, sent to relying parties.
@@ -201,7 +210,10 @@ def _verify_jwt_with_fxa_key(
 ) -> FxAEvent | None:
     if not verifying_keys:
         raise Exception("FXA verifying keys are not available.")
-    social_app = SocialApp.objects.get(provider="fxa")
+    social_app = fxa_social_app()
+    if not social_app:
+        raise Exception("FXA SocialApp is not available.")
+    assert isinstance(social_app, SocialApp)
     for verifying_key in verifying_keys:
         if verifying_key["alg"] == "RS256":
             public_key = jwt.algorithms.RSAAlgorithm.from_jwk(json.dumps(verifying_key))