Fix validation and add ntfy as notification adapter (#75)

lib/notification/adapter/ntfy.js

@@ -0,0 +1,51 @@
+import { markdown2Html } from '../../services/markdown.js';
+import { getJob } from '../../services/storage/jobStorage.js';
+import fetch from 'node-fetch';
+
+export const send = ({ serviceName, newListings, notificationConfig, jobKey }) => {
+  const { priority, server, topic } = notificationConfig.find((adapter) => adapter.id === 'ntfy').fields;
+  const job = getJob(jobKey);
+  const jobName = job == null ? jobKey : job.name;
+  const promises = newListings.map((newListing) => {
+    const message = `Address: ${newListing.address} Size: ${newListing.size.replace(/2m/g, '$m^2$')} Price: ${
+      newListing.price
+    }`;
+    return fetch(server, {
+      method: 'POST',
+      body: JSON.stringify({
+        topic: topic,
+        message: message,
+        title: newListing.title,
+        tags: [serviceName, jobName],
+        priority: parseInt(priority),
+        click: newListing.link,
+      }),
+    });
+  });
+
+  return Promise.all(promises);
+};
+export const config = {
+  id: 'ntfy',
+  name: 'ntfy',
+  readme: markdown2Html('lib/notification/adapter/ntfy.md'),
+  description: 'Fredy will send new listings to your ntfy.',
+  fields: {
+    priority: {
+      type: 'number',
+      label: 'Priority',
+      description: 'The priority of the send notification.',
+    },
+    server: {
+      type: 'text',
+      label: 'Server-URL',
+      description: 'The server url to the send the notification to.',
+    },
+    topic: {
+      type: 'text',
+      label: 'topic',
+      description:
+        'The topic where fredy should send notifications to. The topic is a secret, only known to you, make sure it is something not generic.',
+    },
+  },
+};

lib/notification/adapter/ntfy.md

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+### ntfy Adapter
+
+For ntfy, you need to create a topic on your preferred ntfy instance. This is pretty easy. Please visit the steps in the  [docs](https://docs.ntfy.sh/publish/) and follow the instructions.
+
+As a result, you get the URL for configuration in fredy. In addition, the priority must be defined.