added basic subscriptions support for playlists and channels

update youtube-dl binary on windows

updated favicon to the new icon

backend/subscriptions.js

@@ -0,0 +1,203 @@
+const low = require('lowdb')
+const FileSync = require('lowdb/adapters/FileSync')
+
+var fs = require('fs');
+const { uuid } = require('uuidv4');
+var path = require('path');
+
+var youtubedl = require('youtube-dl');
+const config_api = require('./config');
+
+const adapter = new FileSync('db.json');
+const db = low(adapter)
+
+let debugMode = process.env.YTDL_MODE === 'debug';
+
+async function subscribe(sub) {
+    const result_obj = {
+        success: false,
+        error: ''
+    };
+    return new Promise(async resolve => {
+        // sub should just have url and name. here we will get isPlaylist and path
+        sub.isPlaylist = sub.url.includes('playlist');
+
+        if (db.get('subscriptions').find({url: sub.url}).value()) {
+            console.log('Sub already exists');
+            result_obj.error = 'Subcription with URL ' + sub.url + ' already exists!';
+            resolve(result_obj);
+            return;
+        }
+
+        // add sub to db
+        db.get('subscriptions').push(sub).write();
+
+        await getVideosForSub(sub);
+        result_obj.success = true;
+        result_obj.sub = sub;
+        resolve(result_obj);
+    });
+    
+}
+
+async function unsubscribe(sub, deleteMode) {
+    return new Promise(async resolve => {
+        const basePath = config_api.getConfigItem('ytdl_subscriptions_base_path');
+        let result_obj = { success: false, error: '' };
+
+        let id = sub.id;
+        db.get('subscriptions').remove({id: id}).write();
+
+        const appendedBasePath = getAppendedBasePath(sub, basePath);
+        if (deleteMode && fs.existsSync(appendedBasePath)) {
+            if (sub.archive && fs.existsSync(sub.archive)) {
+                const archive_file_path = path.join(sub.archive, 'archive.txt');
+                // deletes archive if it exists
+                if (fs.existsSync(archive_file_path)) {
+                    fs.unlinkSync(archive_file_path);
+                }
+                fs.rmdirSync(sub.archive);
+            }
+            deleteFolderRecursive(appendedBasePath);
+        }
+    });
+
+}
+
+async function getVideosForSub(sub) {
+    return new Promise(resolve => {
+        const basePath = config_api.getConfigItem('ytdl_subscriptions_base_path');
+        const useArchive = config_api.getConfigItem('ytdl_subscriptions_use_youtubedl_archive');
+
+        const appendedBasePath = basePath + (sub.isPlaylist ? 'playlists/%(playlist_title)s' : 'channels/%(uploader)s');
+
+        let downloadConfig = ['-o', appendedBasePath + '/%(title)s.mp4', '-f', 'bestvideo[ext=mp4]+bestaudio[ext=m4a]/mp4', '-ciw', '--write-annotations', '--write-thumbnail', '--write-info-json', '--print-json'];
+
+        if (sub.timerange) {
+            downloadConfig.push('--dateafter', sub.timerange);
+        }
+
+        let archive_dir = null;
+        let archive_path = null;
+        let usingTempArchive = false;
+
+        if (useArchive) {
+            if (sub.archive) {
+                archive_dir = sub.archive;
+                archive_path = path.join(archive_dir, 'archive.txt')
+            } else {
+                usingTempArchive = true;
+
+                // set temporary archive
+                archive_dir = basePath + 'archives/' + sub.id;
+                archive_path = path.join(archive_dir, sub.id + '.txt');
+
+                // create temporary dir and archive txt
+                if (!fs.existsSync(archive_dir)) {
+                    fs.mkdirSync(archive_dir);
+                    fs.closeSync(fs.openSync(archive_path, 'w'));
+                }
+            }
+            downloadConfig.push('--download-archive', archive_path);
+        }
+
+        // get videos 
+        youtubedl.exec(sub.url, downloadConfig, {}, function(err, output) {
+            if (debugMode) {
+                console.log('Subscribe: got videos for subscription ' + sub.name);
+            }
+            if (err) {
+                console.log(err.stderr);
+                resolve(false);
+            } else if (output) {
+                if (output.length === 0) {
+                    if (debugMode) console.log('No additional videos to download for ' + sub.name);
+                }
+                for (let i = 0; i < output.length; i++) {
+                    let output_json = null;
+                    try {
+                        output_json = JSON.parse(output[i]);
+                    } catch(e) {
+                        output_json = null;
+                    }
+                    if (!output_json) {
+                        continue;
+                    }
+
+                    if (!sub.name && output_json) {
+                        sub.name = sub.isPlaylist ? output_json.playlist_title : output_json.uploader;
+                        // if it's now valid, update
+                        if (sub.name) {
+                            db.get('subscriptions').find({id: sub.id}).assign({name: sub.name}).write();
+                        }
+                    }
+
+                    if (usingTempArchive && !sub.archive && sub.name) {
+                        let new_archive_dir = basePath + 'archives/' + sub.name;
+
+                        // TODO: clean up, code looks ugly
+                        if (fs.existsSync(new_archive_dir)) {
+                            if (fs.existsSync(new_archive_dir + '/archive.txt')) {
+                                console.log('INFO: Archive file already exists. Rewriting archive.');
+                                fs.unlinkSync(new_archive_dir + '/archive.txt')
+                            }
+                        } else {
+                            // creates archive directory for subscription
+                            fs.mkdirSync(new_archive_dir);
+                        }
+
+                        // moves archive
+                        fs.copyFileSync(archive_path, new_archive_dir + '/archive.txt');
+
+                        // updates subscription
+                        sub.archive = new_archive_dir;
+                        db.get('subscriptions').find({id: sub.id}).assign({archive: new_archive_dir}).write();
+
+                        // remove temporary archive directory
+                        fs.unlinkSync(archive_path);
+                        fs.rmdirSync(archive_dir);
+                    }
+                }
+                resolve(true);
+            }
+        });
+    });
+}
+
+function getAllSubscriptions() {
+    const subscriptions = db.get('subscriptions').value();
+    return subscriptions;
+}
+
+function getSubscription(subID) {
+    return db.get('subscriptions').find({id: subID}).value();
+}
+
+// helper functions
+
+function getAppendedBasePath(sub, base_path) {
+    return base_path + (sub.isPlaylist ? 'playlists/' : 'channels/') + sub.name;
+}
+
+// https://stackoverflow.com/a/32197381/8088021
+const deleteFolderRecursive = function(folder_to_delete) {
+    if (fs.existsSync(folder_to_delete)) {
+      fs.readdirSync(folder_to_delete).forEach((file, index) => {
+        const curPath = path.join(folder_to_delete, file);
+        if (fs.lstatSync(curPath).isDirectory()) { // recurse
+          deleteFolderRecursive(curPath);
+        } else { // delete file
+          fs.unlinkSync(curPath);
+        }
+      });
+      fs.rmdirSync(folder_to_delete);
+    }
+  };
+
+module.exports = {
+    getSubscription    : getSubscription,
+    getAllSubscriptions: getAllSubscriptions,
+    subscribe          : subscribe,
+    unsubscribe        : unsubscribe,
+    getVideosForSub    : getVideosForSub
+}