Improve security by auditing service role key usage in edge functions

Audit and document the usage of service role keys in multiple Supabase edge functions (cancel-email-change, process-selective-approval, seed-test-data) to ensure secure and scoped access.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: fe5b902e-beda-40fc-bf87-a3c4ab300e3a
Replit-Commit-Checkpoint-Type: intermediate_checkpoint

.replit

@@ -33,3 +33,7 @@ outputType = "webview"
 [[ports]]
 localPort = 5000
 externalPort = 80
+
+[[ports]]
+localPort = 44859
+externalPort = 3000

supabase/functions/cancel-email-change/index.ts

@@ -22,8 +22,14 @@ Deno.serve(async (req) => {
     // Extract the JWT token from the Authorization header
     const token = authHeader.replace('Bearer ', '');
 
-    // Create admin client with service role key (no user token in global headers)
+    // SECURITY: Service Role Key Usage
-    // This ensures all DB operations run with full admin privileges
+    // ---------------------------------
+    // This function uses the service role key to bypass RLS and access auth.users table.
+    // This is required because:
+    // 1. The cancel_user_email_change() database function has SECURITY DEFINER privileges
+    // 2. It needs to modify auth.users table which is not accessible with regular user tokens
+    // 3. User authentication is still verified via JWT token (passed to getUser())
+    // Scope: Limited to cancelling the authenticated user's own email change
     const supabaseUrl = Deno.env.get('SUPABASE_URL');
     const supabaseServiceKey = Deno.env.get('SUPABASE_SERVICE_ROLE_KEY');
     

supabase/functions/process-selective-approval/index.ts

@@ -74,6 +74,11 @@ serve(async (req) => {
       );
     }
     
+    // SECURITY NOTE: Service role key used later in this function
+    // Reason: Need to bypass RLS to write approved changes to entity tables
+    // (parks, rides, companies, ride_models) which have RLS policies
+    // Security measures: User auth verified above, moderator role checked via RPC
+
     const authenticatedUserId = user.id;
 
     // Create service role client for privileged operations (including role check)

supabase/functions/seed-test-data/index.ts

@@ -35,6 +35,13 @@ Deno.serve(async (req) => {
   }
 
   try {
+    // SECURITY: Service Role Key Usage
+    // ---------------------------------
+    // This function uses the service role key to seed test data bypassing RLS.
+    // This is required because:
+    // 1. Test data generation needs to create entities in protected tables
+    // 2. Moderator role is verified via is_moderator() RPC call before proceeding
+    // Scope: Limited to moderators only, for test/development purposes
     const supabaseUrl = Deno.env.get('SUPABASE_URL')!;
     const supabaseServiceKey = Deno.env.get('SUPABASE_SERVICE_ROLE_KEY')!;
     const supabase = createClient(supabaseUrl, supabaseServiceKey);