.

package-lock.json

@@ -911,6 +911,15 @@
       "integrity": "sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==",
       "dev": true
     },
+    "@types/xml2js": {
+      "version": "0.4.5",
+      "resolved": "https://registry.npmjs.org/@types/xml2js/-/xml2js-0.4.5.tgz",
+      "integrity": "sha512-yohU3zMn0fkhlape1nxXG2bLEGZRc1FeqF80RoHaYXJN7uibaauXfhzhOJr1Xh36sn+/tx21QAOf07b/xYVk1w==",
+      "dev": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@types/yargs": {
       "version": "15.0.4",
       "resolved": "https://registry.npmjs.org/@types/yargs/-/yargs-15.0.4.tgz",
@@ -1841,10 +1850,19 @@
       }
     },
     "crypto-random-string": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/crypto-random-string/-/crypto-random-string-1.0.0.tgz",
-      "integrity": "sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=",
-      "dev": true
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/crypto-random-string/-/crypto-random-string-3.2.0.tgz",
+      "integrity": "sha512-8vPu5bsKaq2uKRy3OL7h1Oo7RayAWB8sYexLKAqvCXVib8SxgbmoF1IN4QMKjBv8uI8mp5gPPMbiRah25GMrVQ==",
+      "requires": {
+        "type-fest": "^0.8.1"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "0.8.1",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.8.1.tgz",
+          "integrity": "sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA=="
+        }
+      }
     },
     "cssom": {
       "version": "0.4.4",
@@ -6621,6 +6639,14 @@
       "dev": true,
       "requires": {
         "crypto-random-string": "^1.0.0"
+      },
+      "dependencies": {
+        "crypto-random-string": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/crypto-random-string/-/crypto-random-string-1.0.0.tgz",
+          "integrity": "sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=",
+          "dev": true
+        }
       }
     },
     "unpipe": {

package.json

@@ -4,6 +4,7 @@
     "develop": "concurrently \"tsc --watch\" \"nodemon lib/server.js\""
   },
   "dependencies": {
+    "crypto-random-string": "^3.2.0",
     "express": "^4.17.1",
     "react": "^16.13.0",
     "react-dom": "^16.13.0",
@@ -12,8 +13,10 @@
   "devDependencies": {
     "@types/express": "^4.17.3",
     "@types/jest": "^25.1.4",
+    "@types/node": "^13.9.1",
     "@types/react": "^16.9.23",
     "@types/react-dom": "^16.9.5",
+    "@types/xml2js": "^0.4.5",
     "concurrently": "^5.1.0",
     "jest": "^25.1.0",
     "nodemon": "^2.0.2",

src/components.tsx

@@ -80,3 +80,38 @@ export class Form extends React.Component {
     );
   }
 }
+
+export class Created extends React.Component<{ name: string; token: string }> {
+  render() {
+    return (
+      <>
+        <h1>“{this.props.name}” Inbox Created</h1>
+        <p>
+          Sign up for the newsletter with
+          <br />
+          <code>{this.props.token}@kill-the-newsletter.com</code>
+        </p>
+        <p>
+          Subscribe to the Atom feed at
+          <br />
+          <code>
+            https://www.kill-the-newsletter.com/feeds/{this.props.token}.xml
+          </code>
+        </p>
+        <p>
+          Don’t share these addresses.
+          <br />
+          They contain a security token that other people could use
+          <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>
+      </>
+    );
+  }
+}

src/server.tsx

@@ -1,11 +1,14 @@
 import express from "express";
 import React from "react";
 import ReactDOMServer from "react-dom/server";
-import { Layout, Form } from "./components";
+import { Layout, Form, Created } from "./components";
+import fs from "fs";
+import cryptoRandomString from "crypto-random-string";
 
 const app = express();
 
 app.use(express.static("static"));
+app.use(express.urlencoded());
 
 app.get("/", (req, res) =>
   res.send(
@@ -17,6 +20,22 @@ app.get("/", (req, res) =>
   )
 );
 
+app.post("/", (req, res) => {
+  res.send(
+    render(
+      <Layout>
+        <Created
+          name={req.body.name}
+          token={cryptoRandomString({
+            length: 20,
+            characters: "1234567890qwertyuiopasdfghjklzxcvbnm"
+          })}
+        ></Created>
+      </Layout>
+    )
+  );
+});
+
 app.listen(8000);
 
 function render(component: React.ReactElement): string {