CORS config file fix

api/core/config.py

@@ -1,3 +1,5 @@
+import json
+
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
@@ -10,8 +12,12 @@ class Settings(BaseSettings):
 
     PROJECT_NAME: str = "Workspaces API"
 
-    # Comma separated list of origins, or "*" to allow all origins. Defaults to an empty list.
-    # Example: CORS_ORIGINS="https://workspaces.example.com,https://leaderboard.example.com"
+    # Allowed CORS origins. Accepts either a comma-separated list OR a JSON
+    # array (the deployment stack historically supplies a JSON array), plus "*"
+    # for all origins. Read via `cors_origins_list`, not this raw string.
+    # Examples:
+    #   CORS_ORIGINS="https://workspaces.example.com,https://leaderboard.example.com"
+    #   CORS_ORIGINS='["https://workspaces.example.com"]'
     CORS_ORIGINS: str = ""
 
     TASK_DATABASE_URL: str = (
@@ -55,6 +61,26 @@ class Settings(BaseSettings):
 
     SENTRY_DSN: str = ""
 
+    @property
+    def cors_origins_list(self) -> list[str]:
+        """Allowed CORS origins as a list.
+
+        Tolerates both formats the deployment has used: a JSON array
+        (``["https://a","https://b"]``) and a comma-separated string
+        (``https://a,https://b``). ``"*"`` is passed through as-is.
+        """
+        raw = self.CORS_ORIGINS.strip()
+        if not raw:
+            return []
+        if raw.startswith("["):
+            try:
+                parsed = json.loads(raw)
+            except json.JSONDecodeError:
+                parsed = None
+            if isinstance(parsed, list):
+                return [str(o).strip() for o in parsed if str(o).strip()]
+        return [o.strip() for o in raw.split(",") if o.strip()]
+
     model_config = SettingsConfigDict(
         env_file=".env",
         env_file_encoding="utf-8",

api/main.py

@@ -97,9 +97,7 @@ async def lifespan(_app: FastAPI):
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=[
-        origin.strip() for origin in settings.CORS_ORIGINS.split(",") if origin.strip()
-    ],
+    allow_origins=settings.cors_origins_list,
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],

tests/unit/test_config.py

@@ -45,6 +45,43 @@ def test_cors_origins_parsed_from_json_env(monkeypatch):
     assert s.CORS_ORIGINS == "https://a.example,https://b.example"
 
 
+def test_cors_origins_list_comma_separated(monkeypatch):
+    monkeypatch.setenv("CORS_ORIGINS", "https://a.example, https://b.example")
+    s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg
+    assert s.cors_origins_list == ["https://a.example", "https://b.example"]
+
+
+def test_cors_origins_list_json_array(monkeypatch):
+    # The deployment stack supplies a JSON array; it must parse, not become one
+    # malformed bracketed origin.
+    monkeypatch.setenv("CORS_ORIGINS", '["https://a.example","https://b.example"]')
+    s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg
+    assert s.cors_origins_list == ["https://a.example", "https://b.example"]
+
+
+def test_cors_origins_list_single_json_array(monkeypatch):
+    monkeypatch.setenv("CORS_ORIGINS", '["https://only.example"]')
+    s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg
+    assert s.cors_origins_list == ["https://only.example"]
+
+
+def test_cors_origins_list_empty_and_wildcard(monkeypatch):
+    s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg
+    assert s.cors_origins_list == []
+
+    monkeypatch.setenv("CORS_ORIGINS", "*")
+    s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg
+    assert s.cors_origins_list == ["*"]
+
+
+def test_cors_origins_list_malformed_json_falls_back_to_comma(monkeypatch):
+    # A value that starts with "[" but isn't valid JSON should not crash; fall
+    # back to comma-splitting rather than raising.
+    monkeypatch.setenv("CORS_ORIGINS", "[not json")
+    s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg
+    assert s.cors_origins_list == ["[not json"]
+
+
 def test_value_types_and_formats():
     s = Settings(_env_file=None)  # type: ignore[call-arg]  # pydantic-settings init kwarg