fix: Enhanced Authentication Logic: Added fallback to chatgpt authentication method when no API key is provided, enabling seamless use of existing auth.json files.

Author: mrorigo

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "a2a-acp"
-version = "0.2.0"
+version = "0.2.1"
 description = "A native A2A protocol server that exposes ZedACP agents over HTTP using JSON-RPC 2.0."
 authors = [{ name = "Autonomous Developer Agent" }]
 readme = "README.md"

src/a2a_acp/zed_agent.py

@@ -338,9 +338,21 @@ async def initialize(self) -> dict[str, Any] | None:
                     self._logger.info("Using API key authentication", extra={"method_id": api_key_method_id})
                     await self.authenticate(api_key_method_id, self._api_key)
                 elif api_key_method:
-                    raise AgentProcessError("Agent requires API key authentication but no API key provided")
+                    # Try chatgpt method as fallback when no API key is provided
+                    chatgpt_method = next((m for m in auth_methods if m.get("id") == "chatgpt"), None)
+                    if chatgpt_method:
+                        self._logger.info("Using ChatGPT authentication with existing auth.json", extra={"method_id": "chatgpt"})
+                        await self.authenticate("chatgpt")
+                    else:
+                        raise AgentProcessError("Agent requires API key authentication but no API key provided and no chatgpt method available")
                 else:
-                    raise AgentProcessError(f"Agent requires authentication but no supported method found. Available: {[m.get('id') for m in auth_methods]}")
+                    # No API key method available, try chatgpt method if available
+                    chatgpt_method = next((m for m in auth_methods if m.get("id") == "chatgpt"), None)
+                    if chatgpt_method:
+                        self._logger.info("Using ChatGPT authentication with existing auth.json", extra={"method_id": "chatgpt"})
+                        await self.authenticate("chatgpt")
+                    else:
+                        raise AgentProcessError(f"Agent requires authentication but no supported method found. Available: {[m.get('id') for m in auth_methods]}")
             else:
                 self._logger.debug("No authentication required")