durable-objects: route on the action segment, not a substring of the path

durable-objects/src/entry.py

@@ -20,23 +20,24 @@ class Default(WorkerEntrypoint):
     async def fetch(self, request):
         url = urlparse(request.url)
 
-        list_id = url.path.split("/")[1]
-        if list_id == "":
-            return Response(
-                "Go to /<list_id>/show to see messages\nGo to /<list_id>/add/<message> to add a message",
-                status=400,
-            )
+        # /<list_id>/<action>[/<message>]
+        parts = url.path.split("/")
+        list_id = parts[1]
+        action = parts[2] if len(parts) > 2 else ""
+        message = parts[3] if len(parts) > 3 else ""
+        usage = "Go to /<list_id>/show to see messages\nGo to /<list_id>/add/<message> to add a message"
+        if list_id == "" or (action == "add" and message == ""):
+            return Response(usage, status=400)
 
         do_id = self.env.LISTS.idFromName(list_id)
         stub = self.env.LISTS.get(do_id)
 
         # Note: This is adding a message via GET URL path for simplicity, in a real app, use a POST
-        if "/add" in url.path:
+        if action == "add":
             # message = await request.text()
-            message = url.path.split("/")[3]
             await stub.add_message(message)
             return Response("Message sent")
-        elif "/show" in url.path:
+        elif action == "show":
             messages = await stub.get_messages()
             if not messages:
                 return Response("No messages")