// This val creates a mailing list manager using blob storage for persistence. // It provides functions to add and remove emails, and to send emails to all subscribers. // The email list is stored as a JSON array in a blob. import { blob } from "https://esm.town/v/std/blob"; import { email } from "https://esm.town/v/std/email"; const BLOB_KEY = new URL(import.meta.url).pathname.split("/").at(-1) + "_email_list"; async function getEmailList(): Promise { return await blob.getJSON(BLOB_KEY) || []; } async function saveEmailList(list: string[]): Promise { await blob.setJSON(BLOB_KEY, list); } async function addEmail(newEmail: string): Promise { const list = await getEmailList(); if (!list.includes(newEmail)) { list.push(newEmail); await saveEmailList(list); return `Email ${newEmail} added successfully.`; } return `Email ${newEmail} already exists in the list.`; } async function removeEmail(emailToRemove: string): Promise { const list = await getEmailList(); const updatedList = list.filter(email => email !== emailToRemove); if (list.length !== updatedList.length) { await saveEmailList(updatedList); return `Email ${emailToRemove} removed successfully.`; } return `Email ${emailToRemove} not found in the list.`; } async function sendEmailToAll(subject: string, content: string): Promise { const list = await getEmailList(); if (list.length === 0) { return "No subscribers in the list."; } for (const recipient of list) { await email({ // to: recipient, subject: subject, text: content, html: `

${content}

` }); } return `Email sent to ${list.length} subscriber(s).`; } export default async function server(req: Request): Promise { const url = new URL(req.url); const path = url.pathname; if (req.method === "POST") { const formData = await req.formData(); const action = formData.get("action"); const emailAddress = formData.get("email") as string; switch (action) { case "add": return new Response(await addEmail(emailAddress)); case "remove": return new Response(await removeEmail(emailAddress)); case "send": const subject = formData.get("subject") as string; const content = formData.get("content") as string; return new Response(await sendEmailToAll(subject, content)); default: return new Response("Invalid action", { status: 400 }); } } // Default: show the management interface const emailList = await getEmailList(); return new Response(` Mailing List Manager

Mailing List Manager

Add Subscriber

Remove Subscriber

Send Email to All Subscribers

Current Subscribers: ${emailList.length}

${email}

`, { headers: { "Content-Type": "text/html" }, }); } const css = ` body { font-family: Arial, sans-serif; max-width: 800px; margin: 0 auto; padding: 20px; } form { margin-bottom: 20px; } input, textarea { margin-bottom: 10px; } textarea { width: 100%; height: 100px; } button { margin-bottom: 10px; } `;

emailListManager