Discord webhook notifications

Fixes #46

lib/helpers.js

@@ -19,6 +19,53 @@ if (!globalThis.fetch) {
   globalThis.fetch = (await import("node-fetch")).default;
 }
 
+/**
+ * Sends a message to a Discord-compatible webhook.
+ * @param {url|string} url The webhook URL.
+ * @param {string} message The message to be sent.
+ * @returns {Promise}
+ */
+async function sendMessageToWebhook(url, message) {
+  // Create the payload object with the message
+  const payload = { content: message };
+
+  // Send a POST request to the webhook url with the payload as JSON
+  try {
+    const response = await fetch(url, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(payload),
+    });
+
+    // Check if the request was successful
+    if (!response.ok) {
+      throw new Error(`HTTP error! Status: ${response.status}`);
+    } else {
+      return true;
+    }
+  } catch (error) {
+    console.error('Error sending message to webhook:', error);
+    return false;
+  }
+}
+
+/**
+ * Sends a CGPS notification to a Discord-compatible webhook.
+ * Automatically checks if the webhook URL exists.
+ * @param {string} msg The message to be sent.
+ * @returns {Promise}
+ */
+export async function notifyWebhook(msg) {
+  // Check if the webhook URL exists
+  const webhook_url = process.env.DISCORD_WEBHOOK_URL;
+
+  if (webhook_url || !webhook_url.startsWith('http')) {
+    // Send the message to the webhook
+    await sendMessageToWebhook(webhook_url, `CGPS: ${msg}`);
+  }
+  // Not logging the lack of a webhook URL since it's not a feature everyone would use
+}
+
 /**
  * Fires request to the specified URL.
  * @param {string} url The URL to which the request will be fired.
@@ -53,6 +100,8 @@ const request = async (url, options) => {
   });
 
   if (!response.ok) {
+    // Send a message to the Discord webhook if it exists
+    await notifyWebhook(`An HTTP error has occurred (${response.status}) while making a web request. Please check the logs for further details.`);
     throw new Error(`HTTP error! Status: ${response.status}`);
   }