Initial commit — Aspekter VA email builder
Full project: Svelte 5 frontend, Vite 7 backend API, Pug email templates (email-gen), Docker deployment. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Sergey Zotov
197
deploy/email-gen-api/server.js
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197
deploy/email-gen-api/server.js
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const http = require('http')
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const fs = require('fs')
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const path = require('path')
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const { spawnSync } = require('child_process')
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const PORT = Number(process.env.PORT || 8787)
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const EMAIL_GEN_ROOT = path.resolve(process.env.EMAIL_GEN_ROOT || '/workspace/email-gen')
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function send(res, status, payload) {
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res.statusCode = status
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res.setHeader('Content-Type', 'application/json')
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res.end(JSON.stringify(payload))
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}
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const MAX_BODY_SIZE = 5 * 1024 * 1024
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function readBody(req) {
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return new Promise((resolve, reject) => {
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let size = 0
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let data = ''
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req.on('data', (chunk) => {
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size += chunk.length
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if (size <= MAX_BODY_SIZE) data += chunk
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})
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req.on('end', () => {
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if (size > MAX_BODY_SIZE) return reject(new Error('payload_too_large'))
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try {
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resolve(data ? JSON.parse(data) : {})
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} catch {
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reject(new Error('invalid_json'))
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}
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})
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})
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}
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function sanitizeProjectSlug(value) {
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return String(value || '').trim().replace(/[^a-zA-Z0-9_-]/g, '')
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}
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function rewriteHtmlPug(projectDir, preheader = '', gender = 'female', genderPaths = {}) {
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const htmlPugPath = path.resolve(projectDir, 'html.pug')
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const safePreheader = preheader.replace(/\\/g, '\\\\').replace(/"/g, '\\"')
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function sanitizePartPath(p, fallback) {
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if (!p || typeof p !== 'string') return fallback
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const clean = p.replace(/\\/g, '/').replace(/\/+/g, '/')
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if (/\.\./.test(clean) || /[\0\r\n]/.test(clean)) return fallback
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if (!clean.startsWith('./parts/') && !clean.startsWith('parts/')) return fallback
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return clean
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}
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const headerPath = gender === 'male'
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? sanitizePartPath(genderPaths.headerMale, './parts/header/header-man')
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: sanitizePartPath(genderPaths.headerFemale, './parts/header/header-woman')
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const footerPath = gender === 'male'
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? sanitizePartPath(genderPaths.footerMale, './parts/footer/footer-man')
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: sanitizePartPath(genderPaths.footerFemale, './parts/footer/footer-woman')
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const body = [
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'extends layout/layout.pug',
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'',
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'block header',
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` include ${headerPath}`,
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'block preheader',
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` +preheader("${safePreheader}")`,
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'block content',
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' include ./letters/let.pug',
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'block footer',
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` include ${footerPath}`,
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'',
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].join('\n')
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fs.writeFileSync(htmlPugPath, body, 'utf-8')
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}
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function ensureNpmDeps() {
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const marker = path.resolve(EMAIL_GEN_ROOT, 'node_modules')
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if (fs.existsSync(marker)) return
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const install = spawnSync('npm', ['install'], {
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cwd: EMAIL_GEN_ROOT,
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encoding: 'utf-8',
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shell: false,
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})
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if (install.status !== 0) {
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throw new Error((install.stderr || install.stdout || 'npm install failed').trim())
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}
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}
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function renderWithNode(projectSlug, renderTemplate = 'html') {
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const script = `
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const path = require('path');
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const fs = require('fs');
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const Email = require('email-templates');
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async function run() {
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// For node -e, first extra arg starts at argv[1]
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const project = process.argv[1];
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const renderTemplate = process.argv[2];
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const root = process.argv[3];
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const email = new Email();
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const html = await email.render({
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path: project + '/' + renderTemplate,
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juiceResources: {
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preserveImportant: true,
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applyStyleTags: true,
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removeStyleTags: true,
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preserveMediaQueries: true,
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webResources: {
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relativeTo: path.resolve(root, 'emails', project)
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}
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},
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}, { pretty: true });
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const outDir = path.resolve(root, 'public');
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if (!fs.existsSync(outDir)) fs.mkdirSync(outDir, { recursive: true });
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const outPath = path.resolve(outDir, 'index.html');
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const normalized = String(html).replace('#MAILRU_PREHEADER_TAG#', '<vk-snippet-end/>');
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fs.writeFileSync(outPath, normalized, 'utf-8');
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}
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run().catch((error) => {
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console.error(error && error.stack ? error.stack : String(error));
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process.exit(1);
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});
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`
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const run = spawnSync(process.execPath, ['-e', script, projectSlug, renderTemplate, EMAIL_GEN_ROOT], {
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cwd: EMAIL_GEN_ROOT,
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encoding: 'utf-8',
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shell: false,
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timeout: 120000,
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})
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if (run.error || run.status !== 0) {
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throw new Error((run.stderr || run.stdout || run.error?.message || 'render failed').trim())
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}
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}
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const server = http.createServer(async (req, res) => {
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if (req.method === 'GET' && req.url === '/health') {
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return send(res, 200, { ok: true })
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}
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if (req.method === 'POST' && req.url === '/render') {
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let body
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try { body = await readBody(req) } catch (e) { return send(res, 400, { error: e.message }) }
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const projectSlug = sanitizeProjectSlug(body.projectSlug)
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const pug = String(body.pug || '')
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const preheader = String(body.preheader || '')
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const gender = String(body.gender || 'female')
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const genderPaths = body.genderPaths || {}
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if (!projectSlug) return send(res, 400, { error: 'missing_project_slug', details: 'Project slug required' })
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if (!pug.trim()) return send(res, 400, { error: 'missing_pug', details: 'PUG required' })
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if (!fs.existsSync(EMAIL_GEN_ROOT)) {
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return send(res, 500, { error: 'email_gen_not_found', details: 'email-gen root missing' })
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}
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const emailsRoot = path.resolve(EMAIL_GEN_ROOT, 'emails')
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const projectDir = path.resolve(emailsRoot, projectSlug)
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if (!projectDir.startsWith(emailsRoot)) {
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return send(res, 400, { error: 'invalid_project_slug', details: 'Invalid project slug' })
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}
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if (!fs.existsSync(projectDir)) {
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return send(res, 404, { error: 'email_project_not_found', details: `Project ${projectSlug} not found` })
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}
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try {
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ensureNpmDeps()
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const lettersDir = path.resolve(projectDir, 'letters')
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if (!fs.existsSync(lettersDir)) fs.mkdirSync(lettersDir, { recursive: true })
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fs.writeFileSync(path.resolve(lettersDir, 'let.pug'), pug, 'utf-8')
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rewriteHtmlPug(projectDir, preheader, gender, genderPaths)
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renderWithNode(projectSlug, 'html')
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const htmlPath = path.resolve(EMAIL_GEN_ROOT, 'public', 'index.html')
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if (!fs.existsSync(htmlPath)) {
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return send(res, 500, { error: 'preview_not_found', details: 'public/index.html not found' })
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}
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const html = fs.readFileSync(htmlPath, 'utf-8')
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return send(res, 200, {
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html,
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generatedAt: new Date().toISOString(),
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})
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} catch (error) {
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return send(res, 500, {
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error: 'render_failed',
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details: error?.message || 'Unknown render error',
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})
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}
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}
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return send(res, 404, { error: 'not_found' })
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})
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server.listen(PORT, () => {
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console.log(`email-gen-api listening on :${PORT}`)
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console.log(`email-gen root: ${EMAIL_GEN_ROOT}`)
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})
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