b6dec2a894
deploy.sh runs on LXC 121: git pull, caddy validate, systemctl reload. webhook.py is a small HTTP receiver on :9797/deploy that verifies the gitea HMAC-SHA256 signature and triggers deploy.sh. install.sh provisions /etc/caddy-deploy/secret and the systemd unit.
107 lines
3.2 KiB
Python
Executable File
107 lines
3.2 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Tiny webhook receiver for the caddy-conf repo.
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Listens on 0.0.0.0:9797. Validates the X-Gitea-Signature HMAC-SHA256 header
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(using the secret in /etc/caddy-deploy/secret), then runs deploy.sh.
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Only triggers on push to master. Returns 204 on success, 400/403 on bad
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request, 500 on deploy failure. Runs one deploy at a time.
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"""
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from __future__ import annotations
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import hashlib
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import hmac
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import json
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import logging
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import os
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import subprocess
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import sys
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import threading
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from http.server import BaseHTTPRequestHandler, HTTPServer
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BIND_HOST = "0.0.0.0"
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BIND_PORT = 9797
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SECRET_PATH = "/etc/caddy-deploy/secret"
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DEPLOY_CMD = ["/etc/caddy/scripts/deploy.sh"]
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TARGET_REF = "refs/heads/master"
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logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
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log = logging.getLogger("caddy-deploy-webhook")
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_deploy_lock = threading.Lock()
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def load_secret() -> bytes:
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with open(SECRET_PATH, "rb") as f:
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return f.read().strip()
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class Handler(BaseHTTPRequestHandler):
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def log_message(self, fmt, *args):
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log.info("%s - %s", self.address_string(), fmt % args)
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def _reply(self, status: int, msg: str = "") -> None:
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self.send_response(status)
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self.send_header("Content-Type", "text/plain")
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self.end_headers()
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if msg:
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self.wfile.write(msg.encode())
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def do_POST(self) -> None:
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if self.path != "/deploy":
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self._reply(404, "not found")
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return
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length = int(self.headers.get("Content-Length", "0"))
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body = self.rfile.read(length) if length else b""
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sig_header = self.headers.get("X-Gitea-Signature", "")
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secret = load_secret()
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expected = hmac.new(secret, body, hashlib.sha256).hexdigest()
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if not hmac.compare_digest(expected, sig_header):
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log.warning("signature mismatch")
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self._reply(403, "bad signature")
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return
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try:
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payload = json.loads(body)
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except json.JSONDecodeError:
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self._reply(400, "bad json")
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return
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ref = payload.get("ref", "")
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if ref != TARGET_REF:
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log.info("ignoring ref %s", ref)
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self._reply(204)
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return
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if not _deploy_lock.acquire(blocking=False):
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log.info("deploy already running, skipping")
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self._reply(202, "already running")
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return
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try:
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log.info("running deploy: %s", DEPLOY_CMD)
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result = subprocess.run(DEPLOY_CMD, capture_output=True, text=True, timeout=120)
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if result.returncode != 0:
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log.error("deploy failed: %s\n%s", result.stdout, result.stderr)
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self._reply(500, "deploy failed")
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return
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log.info("deploy ok")
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self._reply(204)
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finally:
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_deploy_lock.release()
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def main() -> int:
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if not os.path.exists(SECRET_PATH):
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log.error("secret file missing: %s", SECRET_PATH)
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return 1
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server = HTTPServer((BIND_HOST, BIND_PORT), Handler)
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log.info("listening on %s:%d", BIND_HOST, BIND_PORT)
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server.serve_forever()
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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