From 423a1bdf2e89b73ac2aca10e1a20891d5fc01715 Mon Sep 17 00:00:00 2001
From: Hassan Abouelela <47495861+HassanAbouelela@users.noreply.github.com>
Date: Fri, 19 Feb 2021 10:12:46 +0300
Subject: Adds CORS Rules

Signed-off-by: Hassan Abouelela <47495861+HassanAbouelela@users.noreply.github.com>
---
 backend/__init__.py | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

(limited to 'backend')

diff --git a/backend/__init__.py b/backend/__init__.py
index a3704a0..d56edfb 100644
--- a/backend/__init__.py
+++ b/backend/__init__.py
@@ -7,10 +7,20 @@ from starlette.middleware.cors import CORSMiddleware
 
 from backend import constants
 from backend.authentication import JWTAuthenticationBackend
-from backend.route_manager import create_route_map
 from backend.middleware import DatabaseMiddleware, ProtectedDocsMiddleware
+from backend.route_manager import create_route_map
 from backend.validation import api
 
+ORIGINS = [
+    r"(https://[^.?#]*--pydis-forms\.netlify\.app)",  # Netlify Previews
+    r"(https?://[^.?#]*.forms-frontend.pages.dev)",  # Cloudflare Previews
+]
+if not constants.PRODUCTION:
+    # Add localhost to allowed origins on non-production deployments
+    ORIGINS.append(r"(https?://localhost:\d{0,4})")
+
+ALLOW_ORIGIN_REGEX = "|".join(ORIGINS)
+
 sentry_sdk.init(
     dsn=constants.FORMS_BACKEND_DSN,
     send_default_pii=True,
@@ -20,13 +30,13 @@ sentry_sdk.init(
 middleware = [
     Middleware(
         CORSMiddleware,
-        # TODO: Convert this into a RegEx that works for prod, netlify & previews
-        allow_origins=["*"],
+        allow_origins=["https://forms.pythondiscord.com"],
+        allow_origin_regex=ALLOW_ORIGIN_REGEX,
         allow_headers=[
-            "Authorization",
             "Content-Type"
         ],
-        allow_methods=["*"]
+        allow_methods=["*"],
+        allow_credentials=True
     ),
     Middleware(DatabaseMiddleware),
     Middleware(AuthenticationMiddleware, backend=JWTAuthenticationBackend()),
-- 
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