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fix: add API key auth gate on all mutating routes via before_request #95

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fix: add API key auth gate on all mutating routes via before_request #95

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16 changes: 16 additions & 0 deletions python_a2a/server/a2a_server.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import os
"""
Enhanced A2A server with protocol support.
"""
Expand Down Expand Up @@ -342,6 +343,21 @@ def handle_task(self, task):
def setup_routes(self, app):
"""Setup Flask routes for A2A endpoints"""
# Root endpoint for both GET and POST
@app.before_request
def check_auth():
"""Require API key on all mutating routes."""
api_key = os.environ.get("A2A_API_KEY", "")
if not api_key:
return # No key configured = open access (dev mode)
if request.method in ("POST", "PUT", "DELETE", "PATCH"):
auth_header = request.headers.get("Authorization", "")
if auth_header.startswith("Bearer "):
token = auth_header[7:]
else:
token = auth_header
if token != api_key:
return jsonify({"error": "Unauthorized"}), 401

@app.route("/", methods=["GET"])
def a2a_root_get():
"""Root endpoint for A2A (GET), redirects to agent card"""
Expand Down