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Add Gitea-to-Claude-Code-Routines webhook proxy

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Express service that authenticates Gitea deliveries, verifies the HMAC
signature, builds a readable text summary for push/pull_request events,
and forwards it to the Anthropic routines API with the headers Gitea
can't set itself. Includes in-memory delivery dedup, structured logging,
.env.example, and a Dockerfile for deployment behind nginx.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Darío Sevilla
2026-08-23 20:57:22 +02:00
parent 1bf6caf90e
commit 6decb31448
5 changed files with 1106 additions and 0 deletions
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19
.env.example Normal file
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# Puerto en el que escucha el proxy (nginx hará proxy_pass hacia aquí)
PORT=3000
# Valor exacto que Gitea debe enviar en el header "Authorization".
# Configúralo igual en Gitea (Settings -> Webhooks -> Authorization header).
GITEA_AUTH_HEADER=changeme-secreto-A
# Secret configurado en el webhook de Gitea, usado para verificar la firma
# HMAC-SHA256 del header "X-Gitea-Signature".
GITEA_WEBHOOK_SECRET=changeme-secreto-gitea
# ID de la rutina de Claude Code (parte de la URL /routines/{ROUTINE_ID}/fire)
ROUTINE_ID=trig_xxxxxxxxxxxxxxxxxxxxxxxx
# Token de la rutina (sk-ant-oat01-...), se envía como "Authorization: Bearer <token>"
ROUTINE_TOKEN=sk-ant-oat01-changeme
# TTL en milisegundos para el dedup en memoria de entregas de Gitea (X-Gitea-Delivery)
DEDUP_TTL_MS=300000

15
Dockerfile Normal file
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FROM node:18-alpine
WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm install --omit=dev
COPY server.js ./
ENV PORT=3000
EXPOSE 3000
USER node
CMD ["node", "server.js"]

831
package-lock.json generated Normal file
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"name": "gitea-claude-webhook-proxy",
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16
package.json Normal file
View File

@@ -0,0 +1,16 @@
{
"name": "gitea-claude-webhook-proxy",
"version": "1.0.0",
"description": "Proxy que recibe webhooks de Gitea y los reenvía a la API de Claude Code Routines",
"main": "server.js",
"type": "commonjs",
"engines": {
"node": ">=18"
},
"scripts": {
"start": "node server.js"
},
"dependencies": {
"express": "^4.19.2"
}
}

225
server.js Normal file
View File

@@ -0,0 +1,225 @@
'use strict';
const crypto = require('crypto');
const express = require('express');
const {
PORT = '3000',
GITEA_AUTH_HEADER,
GITEA_WEBHOOK_SECRET,
ROUTINE_ID,
ROUTINE_TOKEN,
DEDUP_TTL_MS = String(5 * 60 * 1000),
} = process.env;
for (const [name, value] of Object.entries({
GITEA_AUTH_HEADER,
GITEA_WEBHOOK_SECRET,
ROUTINE_ID,
ROUTINE_TOKEN,
})) {
if (!value) {
console.error(JSON.stringify({ level: 'error', message: `Falta la variable de entorno ${name}` }));
process.exit(1);
}
}
const ANTHROPIC_FIRE_URL = `https://api.anthropic.com/v1/claude_code/routines/${ROUTINE_ID}/fire`;
const ANTHROPIC_BETA_HEADER = 'experimental-cc-routine-2026-04-01';
const ANTHROPIC_VERSION = '2023-06-01';
const MAX_TEXT_LENGTH = 65536;
const dedupTtlMs = Number(DEDUP_TTL_MS);
const app = express();
app.disable('x-powered-by');
function log(level, fields) {
const line = { level, timestamp: new Date().toISOString(), ...fields };
const out = level === 'error' ? console.error : console.log;
out(JSON.stringify(line));
}
// Constant-time string comparison. Returns false (without leaking length
// via early exit timing) when the inputs differ in length.
function safeCompare(a, b) {
const bufA = Buffer.from(String(a), 'utf8');
const bufB = Buffer.from(String(b), 'utf8');
if (bufA.length !== bufB.length) {
crypto.timingSafeEqual(bufA, bufA);
return false;
}
return crypto.timingSafeEqual(bufA, bufB);
}
function verifyGiteaSignature(rawBody, signatureHeader) {
if (!signatureHeader) return false;
const expected = crypto
.createHmac('sha256', GITEA_WEBHOOK_SECRET)
.update(rawBody)
.digest('hex');
return safeCompare(expected.toLowerCase(), String(signatureHeader).toLowerCase());
}
// Dedup de entregas de Gitea (por X-Gitea-Delivery) con TTL en memoria.
const seenDeliveries = new Map();
function isDuplicateDelivery(deliveryId) {
if (!deliveryId) return false;
const now = Date.now();
const seenAt = seenDeliveries.get(deliveryId);
if (seenAt && now - seenAt < dedupTtlMs) {
return true;
}
seenDeliveries.set(deliveryId, now);
return false;
}
setInterval(() => {
const now = Date.now();
for (const [id, seenAt] of seenDeliveries) {
if (now - seenAt >= dedupTtlMs) seenDeliveries.delete(id);
}
}, 60 * 1000).unref();
function truncate(text) {
return text.length > MAX_TEXT_LENGTH ? `${text.slice(0, MAX_TEXT_LENGTH - 1)}…` : text;
}
function buildTextFromPush(payload) {
const repo = payload.repository?.full_name || 'repo desconocido';
const branch = (payload.ref || '').replace(/^refs\/heads\//, '') || 'rama desconocida';
const pusher = payload.pusher?.full_name || payload.pusher?.username || payload.sender?.login || 'alguien';
const commits = Array.isArray(payload.commits) ? payload.commits : [];
const lastCommit = commits[commits.length - 1];
const message = lastCommit?.message?.split('\n')[0] || '(sin commits)';
const compareUrl = payload.compare_url || payload.repository?.html_url || '';
return [
`[${repo}] ${pusher} hizo push a "${branch}" (${commits.length} commit(s))`,
`Último commit: ${message}`,
compareUrl ? `Comparar: ${compareUrl}` : null,
]
.filter(Boolean)
.join('\n');
}
function buildTextFromPullRequest(payload) {
const repo = payload.repository?.full_name || 'repo desconocido';
const pr = payload.pull_request || {};
const action = payload.action || 'actualizado';
const author = pr.user?.login || pr.user?.full_name || 'alguien';
const title = pr.title || '(sin título)';
const head = pr.head?.ref || '?';
const base = pr.base?.ref || '?';
const url = pr.html_url || payload.repository?.html_url || '';
return [
`[${repo}] Pull request ${action} #${payload.number ?? pr.number ?? ''} por ${author}`,
`${title}`,
`${head} -> ${base}`,
url ? `URL: ${url}` : null,
]
.filter(Boolean)
.join('\n');
}
function buildText(event, payload) {
let text;
switch (event) {
case 'push':
text = buildTextFromPush(payload);
break;
case 'pull_request':
text = buildTextFromPullRequest(payload);
break;
default: {
const repo = payload.repository?.full_name || 'repo desconocido';
text = `[${repo}] Evento de Gitea recibido: ${event}`;
}
}
return truncate(text);
}
async function fireRoutine(text, deliveryId, event) {
try {
const res = await fetch(ANTHROPIC_FIRE_URL, {
method: 'POST',
headers: {
Authorization: `Bearer ${ROUTINE_TOKEN}`,
'anthropic-beta': ANTHROPIC_BETA_HEADER,
'anthropic-version': ANTHROPIC_VERSION,
'Content-Type': 'application/json',
},
body: JSON.stringify({ text }),
});
if (res.ok) {
log('info', { deliveryId, event, result: 'forwarded', status: res.status });
return;
}
const bodyText = await res.text().catch(() => '');
const fields = { deliveryId, event, result: 'anthropic_error', status: res.status, body: bodyText.slice(0, 1000) };
if (res.status === 429) {
fields.retryAfter = res.headers.get('retry-after') || null;
}
log('error', fields);
} catch (err) {
log('error', { deliveryId, event, result: 'fetch_failed', error: err.message });
}
}
const rawBodySaver = (req, res, buf) => {
req.rawBody = buf;
};
app.post(
'/gitea-webhook',
(req, res, next) => {
const authHeader = req.header('Authorization') || '';
if (!safeCompare(authHeader, GITEA_AUTH_HEADER)) {
log('error', { result: 'unauthorized', reason: 'bad_auth_header' });
return res.status(401).json({ error: 'unauthorized' });
}
next();
},
express.json({ verify: rawBodySaver, limit: '2mb' }),
(req, res, next) => {
const signature = req.header('X-Gitea-Signature');
if (!req.rawBody || !verifyGiteaSignature(req.rawBody, signature)) {
log('error', { result: 'unauthorized', reason: 'bad_signature' });
return res.status(401).json({ error: 'unauthorized' });
}
next();
},
(req, res) => {
const deliveryId = req.header('X-Gitea-Delivery') || null;
const event = req.header('X-Gitea-Event') || 'unknown';
if (isDuplicateDelivery(deliveryId)) {
log('info', { deliveryId, event, result: 'duplicate_ignored' });
return res.status(200).json({ status: 'duplicate_ignored' });
}
res.status(200).json({ status: 'accepted' });
const text = buildText(event, req.body || {});
log('info', { deliveryId, event, result: 'accepted' });
fireRoutine(text, deliveryId, event);
}
);
app.get('/health', (req, res) => {
res.status(200).json({ status: 'ok' });
});
// eslint-disable-next-line no-unused-vars
app.use((err, req, res, next) => {
log('error', { result: 'request_error', error: err.message });
res.status(400).json({ error: 'bad_request' });
});
const port = Number(PORT);
app.listen(port, () => {
log('info', { message: `Servidor escuchando en el puerto ${port}` });
});