adding resend as net notification adapter

lib/notification/adapter/resend.js

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+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+import { Resend } from 'resend';
+import path from 'path';
+import fs from 'fs';
+import Handlebars from 'handlebars';
+import { markdown2Html } from '../../services/markdown.js';
+import { getDirName, normalizeImageUrl } from '../../utils.js';
+
+const __dirname = getDirName();
+const template = fs.readFileSync(path.resolve(__dirname + '/notification/emailTemplate/template.hbs'), 'utf8');
+const emailTemplate = Handlebars.compile(template);
+
+const mapListings = (serviceName, jobKey, listings) =>
+  listings.map((l) => {
+    const image = normalizeImageUrl(l.image);
+    return {
+      title: l.title || '',
+      link: l.link || '',
+      address: l.address || '',
+      size: l.size || '',
+      price: l.price || '',
+      image,
+      hasImage: Boolean(image),
+      serviceName,
+      jobKey,
+    };
+  });
+
+export const send = async ({ serviceName, newListings, notificationConfig, jobKey }) => {
+  const { apiKey, receiver, from } = notificationConfig.find((adapter) => adapter.id === config.id).fields;
+
+  const to = receiver
+    .trim()
+    .split(',')
+    .map((r) => r.trim())
+    .filter(Boolean);
+
+  const resend = new Resend(apiKey);
+
+  const listings = mapListings(serviceName, jobKey, newListings);
+
+  const html = emailTemplate({
+    serviceName: `Job: (${jobKey}) | Service: ${serviceName}`,
+    numberOfListings: listings.length,
+    listings,
+  });
+
+  const { error } = await resend.emails.send({
+    from,
+    to,
+    subject: `Fredy found ${listings.length} new listing(s) for ${serviceName}`,
+    html,
+  });
+
+  if (!error) {
+    return Promise.resolve();
+  } else {
+    return Promise.reject(error.message);
+  }
+};
+
+export const config = {
+  id: 'resend',
+  name: 'Resend',
+  description: 'Resend is being used to send new listings via mail.',
+  readme: markdown2Html('lib/notification/adapter/resend.md'),
+  fields: {
+    apiKey: {
+      type: 'text',
+      label: 'Api Key',
+      description: 'The Resend API key used to send emails.',
+    },
+    receiver: {
+      type: 'email',
+      label: 'Receiver Email',
+      description: 'Comma-separated email addresses Fredy will send notifications to.',
+    },
+    from: {
+      type: 'email',
+      label: 'Sender Email',
+      description: 'The verified email address or domain you send from in Resend.',
+    },
+  },
+};

lib/notification/adapter/resend.md

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+### Resend Adapter
+
+Resend is a modern email delivery service that Fredy can use to send notifications.
+
+Setup:
+- Create a Resend account: https://resend.com/
+- Create an API key and add it to Fredy's configuration.
+- Choose the sender address (e.g., you@yourdomain.com). Verify the domain (https://resend.com/domains/) in Resend before using it.
+- Optional for local testing: you can use `onboarding@resend.dev`, but Resend may restrict who you can send to when using test domains.
+
+Multiple recipients:
+- Separate email addresses with commas (e.g., some@email.com, someOther@email.com).
+
+Notes & Troubleshooting:
+- Ensure the `from` address is verified or belongs to a verified domain in Resend.
+- If emails don't arrive, check your spam folder and Resend dashboard logs.
+- The template displays listing images via their public URLs; make sure images are reachable.