Build API key: don't fetch and validate key twice (#10488)

Instead of relying on the parent method,
we just now override the whole method to have
access to the key itself.

readthedocs/api/v2/permissions.py

@@ -85,7 +85,8 @@ class HasBuildAPIKey(BaseHasAPIKey):
     """
     Custom permission to inject the build API key into the request.
 
-    This avoids having to parse the key again on each view.
+    We completely override the ``has_permission`` method
+    to avoid having to parse and validate the key again on each view.
     The key is injected in the ``request.build_api_key`` attribute
     only if it's valid, otherwise it's set to ``None``.
     """
@@ -94,10 +95,18 @@ class HasBuildAPIKey(BaseHasAPIKey):
     key_parser = TokenKeyParser()
 
     def has_permission(self, request, view):
-        build_api_key = None
-        has_permission = super().has_permission(request, view)
-        if has_permission:
-            key = self.get_key(request)
+        request.build_api_key = None
+        key = self.get_key(request)
+        if not key:
+            return False
+
+        try:
             build_api_key = self.model.objects.get_from_key(key)
+        except self.model.DoesNotExist:
+            return False
+
+        if build_api_key.has_expired:
+            return False
+
         request.build_api_key = build_api_key
-        return has_permission
+        return True