g1t/deploy/self-host/workers/mail/index.js
| 1 | // The Email Sending binding, for self-hosted g1t. |
| 2 | // |
| 3 | // The identity service sends mail through Cloudflare Email Sending: |
| 4 | // `env.EMAIL.send({ to, from, subject, text, html })`. Self-hosted, EMAIL is |
| 5 | // a service binding to this Worker, which offers the same method and: |
| 6 | // |
| 7 | // - always prints the message to the log, so a self-hoster with no mail |
| 8 | // server can still confirm an address by following the link; |
| 9 | // - with MAIL_URL set, hands it to a Mailpit server's send API |
| 10 | // (`POST <MAIL_URL>/api/v1/send`). Mailpit keeps it in its inbox, or |
| 11 | // relays it to a real SMTP server when it is configured to. |
| 12 | // |
| 13 | // Links in messages name g1t.sh, where hosted g1t lives; they are rewritten |
| 14 | // to PUBLIC_URL so they come back to this installation. |
| 15 | |
| 16 | import { WorkerEntrypoint } from "cloudflare:workers"; |
| 17 | |
| 18 | const HOSTED = /https:\/\/g1t\.sh/g; |
| 19 | |
| 20 | function address(value) { |
| 21 | const match = /^(.*)<([^>]+)>\s*$/.exec(value ?? ""); |
| 22 | return match ? { Name: match[1].trim(), Email: match[2].trim() } : { Email: String(value ?? "") }; |
| 23 | } |
| 24 | |
| 25 | export default class Mail extends WorkerEntrypoint { |
| 26 | async send(message) { |
| 27 | const site = (this.env.PUBLIC_URL ?? "http://localhost:8787").replace(/\/$/, ""); |
| 28 | const text = String(message?.text ?? "").replace(HOSTED, site); |
| 29 | const html = String(message?.html ?? "").replace(HOSTED, site); |
| 30 | const from = this.env.MAIL_FROM || message?.from; |
| 31 | const to = Array.isArray(message?.to) ? message.to : [message?.to]; |
| 32 | |
| 33 | console.log(`[mail] to ${to.join(", ")}: ${message?.subject}\n${text}`); |
| 34 | |
| 35 | if (this.env.MAIL_URL) { |
| 36 | const response = await fetch(`${this.env.MAIL_URL.replace(/\/$/, "")}/api/v1/send`, { |
| 37 | method: "POST", |
| 38 | headers: { "content-type": "application/json" }, |
| 39 | body: JSON.stringify({ |
| 40 | From: address(from), |
| 41 | To: to.map(address), |
| 42 | Subject: message?.subject ?? "", |
| 43 | Text: text, |
| 44 | HTML: html, |
| 45 | }), |
| 46 | }); |
| 47 | if (!response.ok) { |
| 48 | throw new Error(`mail server answered ${response.status}: ${await response.text()}`); |
| 49 | } |
| 50 | } |
| 51 | return { messageId: crypto.randomUUID() }; |
| 52 | } |
| 53 | |
| 54 | async fetch() { |
| 55 | return new Response("The Email Sending binding for self-hosted g1t.", { status: 404 }); |
| 56 | } |
| 57 | } |