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

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>
2026-08-23 20:57:22 +02:00
parent 1bf6caf90e
commit 6decb31448
5 changed files with 1106 additions and 0 deletions
--- a/.env.example
+++ b/.env.example
@@ -0,0 +1,19 @@
+# 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
--- a/15
+++ b/15
@@ -0,0 +1,15 @@
+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"]
--- a/package-lock.json
+++ b/package-lock.json
@@ -0,0 +1,831 @@
+{
+  "name": "gitea-claude-webhook-proxy",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
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+      "license": "MIT",
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+    "node_modules/utils-merge": {
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+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
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+    }
+  }
+}
--- a/package.json
+++ b/package.json
@@ -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"
+  }
+}
--- a/server.js
+++ b/server.js
@@ -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}` });
+});