youtube-dl now auto updates on server restart

backend/app.js

@@ -10,6 +10,8 @@ var bodyParser = require("body-parser");
 var archiver = require('archiver');
 var mergeFiles = require('merge-files');
 const low = require('lowdb')
+const downloader = require('youtube-dl/lib/downloader')
+const fetch = require('node-fetch');
 var URL = require('url').URL;
 const shortid = require('shortid')
 const url_api = require('url');
@@ -56,6 +58,9 @@ let debugMode = process.env.YTDL_MODE === 'debug';
 
 if (debugMode) console.log('YTDL-Material in debug mode!');
 
+// updates & starts youtubedl
+startYoutubeDL();
+
 var validDownloadingAgents = [
     'aria2c',
     'avconv',
@@ -613,6 +618,51 @@ function writeToBlacklist(type, line) {
     fs.appendFileSync(blacklistBasePath + 'blacklist.txt', line);
 }
 
+async function startYoutubeDL() {
+    // auto update youtube-dl
+    await autoUpdateYoutubeDL();
+}
+
+// auto updates the underlying youtube-dl binary, not YoutubeDL-Material
+async function autoUpdateYoutubeDL() {
+    return new Promise(resolve => {
+        // get current version
+        let current_app_details_path = 'node_modules/youtube-dl/bin/details';
+        let current_app_details_exists = fs.existsSync(current_app_details_path);
+        if (!current_app_details_exists) {
+            console.log(`Failed to get youtube-dl binary details at location: ${current_app_details_path}. Cancelling update check.`);
+            resolve(false);
+            return;
+        }
+        let current_app_details = JSON.parse(fs.readFileSync(current_app_details_path));
+        let current_version = current_app_details['version'];
+
+        // got version, now let's check the latest version from the youtube-dl API
+        let youtubedl_api_path = 'https://api.github.com/repos/ytdl-org/youtube-dl/tags';
+        fetch(youtubedl_api_path, {method: 'Get'})
+        .then(res => res.json())
+        .then((json) => {
+            // check if the versions are different
+            const latest_update_version = json[0]['name'];    
+            if (current_version !== latest_update_version) {
+                let binary_path = 'node_modules/youtube-dl/bin';
+                // versions different, download new update
+                console.log('INFO: Found new update for youtube-dl. Updating binary...');
+                downloader(binary_path, function error(err, done) {
+                    'use strict'
+                    if (err) {
+                        resolve(false);
+                        throw err;
+                    }
+                    console.log(`INFO: Binary successfully updated: ${current_version} -> ${latest_update_version}`);
+                    resolve(true);
+                });
+            }
+        
+        });
+    });
+}
+
 app.use(function(req, res, next) {
     res.header("Access-Control-Allow-Origin", getOrigin());
     res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

backend/package.json

@@ -26,6 +26,7 @@
     "express": "^4.17.1",
     "lowdb": "^1.0.0",
     "merge-files": "^0.1.2",
+    "node-fetch": "^2.6.0",
     "shortid": "^2.2.15",
     "uuidv4": "^6.0.6",
     "youtube-dl": "^3.0.2"