feat: Implement comprehensive ban enforcement

supabase/functions/_shared/banCheck.ts

@@ -0,0 +1,47 @@
+import { createClient, SupabaseClient } from "https://esm.sh/@supabase/supabase-js@2.57.4";
+import { edgeLogger } from "./logger.ts";
+
+export async function checkUserBanned(
+  userId: string,
+  supabase: SupabaseClient
+): Promise<{ banned: boolean; error?: string }> {
+  try {
+    const { data: profile, error } = await supabase
+      .from('profiles')
+      .select('banned')
+      .eq('user_id', userId)
+      .single();
+
+    if (error) {
+      edgeLogger.error('Ban check failed', { userId, error: error.message });
+      return { banned: false, error: 'Unable to verify account status' };
+    }
+
+    if (!profile) {
+      return { banned: false, error: 'Profile not found' };
+    }
+
+    return { banned: profile.banned };
+  } catch (error) {
+    edgeLogger.error('Ban check exception', { userId, error });
+    return { banned: false, error: 'Internal error checking account status' };
+  }
+}
+
+export function createBannedResponse(requestId: string, corsHeaders: Record<string, string>) {
+  return new Response(
+    JSON.stringify({ 
+      error: 'Account suspended',
+      message: 'Your account has been suspended. Contact support for assistance.',
+      requestId
+    }),
+    { 
+      status: 403, 
+      headers: { 
+        ...corsHeaders, 
+        'Content-Type': 'application/json',
+        'X-Request-ID': requestId 
+      } 
+    }
+  );
+}