Bhasher/kill-the-newsletter
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kill-the-newsletter
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kill-the-newsletter/src/index.tsx

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TypeScript
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import express from "express";
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import { SMTPServer } from "smtp-server";
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import mailparser from "mailparser";
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import React from "react";
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import ReactDOMServer from "react-dom/server";
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import xml2js from "xml2js";
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import { promises as fs } from "fs";
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import cryptoRandomString from "crypto-random-string";
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export const webServer = express()
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.use(express.static("static"))
.use(express.urlencoded({ extended: true }))
.get("/", (req, res) =>
res.send(
renderHTML(
<Layout>
<Form></Form>
</Layout>
)
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)
)
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.post("/", (req, res, next) => {
(async () => {
const name = req.body.name;
const identifier = createIdentifier();
await fs.writeFile(
feedPath(identifier),
renderXML(Feed({ name, identifier }))
);
res.send(
renderHTML(
<Layout>
<h1>“{name}” Inbox Created</h1>
<Created identifier={identifier}></Created>
</Layout>
)
);
})().catch(next);
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})
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.listen(8000);
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export const emailServer = new SMTPServer({
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disabledCommands: ["AUTH", "STARTTLS"],
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onData(stream, session, callback) {
(async () => {
const email = await mailparser.simpleParser(stream);
const { entry } = Entry({
title: email.subject,
author: email.from.text,
// FIXME: https://github.com/DefinitelyTyped/DefinitelyTyped/pull/43234 / typeof email.html !== "boolean" => email.html !== false
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...(typeof email.html === "boolean"
? { html: false, content: email.text ?? "" }
: { content: email.html })
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});
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for (const { address } of session.envelope.rcptTo) {
const match = address.match(/^(\w+)@kill-the-newsletter.com$/);
if (match === null) continue;
const identifier = match[1];
const path = feedPath(identifier);
const xmlText = await fs.readFile(path, "utf8").catch(() => null);
if (xmlText === null) continue;
const xml = await new xml2js.Parser().parseStringPromise(xmlText);
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xml.feed.updated = now();
if (xml.feed.entry === undefined) xml.feed.entry = [];
xml.feed.entry.unshift(entry);
while (xml.feed.entry.length > 0 && renderXML(xml).length > 500_000)
xml.feed.entry.pop();
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await fs.writeFile(path, renderXML(xml));
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}
callback();
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})().catch(error => {
console.error(error);
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stream.resume();
callback(error);
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});
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}
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}).listen(process.env.NODE_ENV === "production" ? 25 : 2525);
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function Layout({ children }: { children: React.ReactNode }) {
return (
<html lang="en">
<head>
<meta charSet="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="author" content="Leandro Facchinetti" />
<meta
name="description"
content="Convert email newsletters into Atom feeds."
/>
<link
rel="icon"
type="image/png"
href="/favicon-32x32.png"
sizes="32x32"
/>
<link
rel="icon"
type="image/png"
href="/favicon-16x16.png"
sizes="16x16"
/>
<link rel="icon" type="image/x-icon" href="/favicon.ico" />
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<link rel="stylesheet" type="text/css" href="/styles.css" />
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<title>Kill the Newsletter!</title>
</head>
<body style={{ textAlign: "center" }}>
<header>
<h1>
<a href="/">Kill the Newsletter!</a>
</h1>
<p>Convert email newsletters into Atom feeds</p>
<p>
<img
alt="Convert email newsletters into Atom feeds"
src="/logo.png"
width="150"
/>
</p>
</header>
<main>{children}</main>
<footer>
<p>
By <a href="https://www.leafac.com">Leandro Facchinetti</a> ·{" "}
<a href="https://github.com/leafac/www.kill-the-newsletter.com">
Source
</a>{" "}
·{" "}
<a href="mailto:kill-the-newsletter@leafac.com">Report an Issue</a>
</p>
</footer>
</body>
</html>
);
}
function Form() {
return (
<form method="POST" action="/">
<p>
<input
type="text"
name="name"
placeholder="Newsletter Name…"
maxLength={500}
size={30}
required
/>
<button>Create Inbox</button>
</p>
</form>
);
}
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function Created({ identifier }: { identifier: string }) {
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return (
<>
<p>
Sign up for the newsletter with
<br />
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<code>{feedEmail(identifier)}</code>
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</p>
<p>
Subscribe to the Atom feed at
<br />
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<code>{feedURL(identifier)}</code>
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</p>
<p>
Don’t share these addresses.
<br />
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They contain an identifier that other people could use
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<br />
to send you spam and to control your newsletter subscriptions.
</p>
<p>Enjoy your readings!</p>
<p>
<a href="https://www.kill-the-newsletter.com">
<strong>Create Another Inbox</strong>
</a>
</p>
</>
);
}
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function Feed({ name, identifier }: { name: string; identifier: string }) {
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return {
feed: {
$: { xmlns: "http://www.w3.org/2005/Atom" },
link: [
{
$: {
rel: "self",
type: "application/atom+xml",
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href: feedURL(identifier)
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}
},
{
$: {
rel: "alternate",
type: "text/html",
href: "https://www.kill-the-newsletter.com/"
}
}
],
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id: urn(identifier),
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title: name,
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subtitle: `Kill the Newsletter! Inbox: ${feedEmail(
identifier
)} → ${feedURL(identifier)}`,
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updated: now(),
...Entry({
title: `“${name}” Inbox Created`,
author: "Kill the Newsletter!",
content: ReactDOMServer.renderToStaticMarkup(
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<Created identifier={identifier}></Created>
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)
})
}
};
}
function Entry({
title,
author,
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content,
html
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}: {
title: string;
author: string;
content: string;
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html?: boolean;
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}) {
return {
entry: {
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id: urn(createIdentifier()),
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title,
author: { name: author },
updated: now(),
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content: {
...(html === false ? {} : { $: { type: "html" } }),
_: content
}
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}
};
}
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function createIdentifier(): string {
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return cryptoRandomString({
length: 20,
characters: "1234567890qwertyuiopasdfghjklzxcvbnm"
});
}
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function now(): string {
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return new Date().toISOString();
}
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function feedPath(identifier: string): string {
return `static/feeds/${identifier}.xml`;
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}
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function feedURL(identifier: string): string {
return `https://www.kill-the-newsletter.com/feeds/${identifier}.xml`;
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}
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function feedEmail(identifier: string): string {
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return `${identifier}@kill-the-newsletter.com`;
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}
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function urn(identifier: string): string {
return `urn:kill-the-newsletter:${identifier}`;
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}
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function renderHTML(component: React.ReactElement): string {
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return `<!DOCTYPE html>\n${ReactDOMServer.renderToStaticMarkup(component)}`;
}
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function renderXML(xml: object): string {
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return new xml2js.Builder().buildObject(xml);
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}