If multiple videos exist in one URL, a playlist will be auto generated

Removed tomp3 and tomp4 routes, replaced with /downloadFile

Simplified category->playlist conversion

Simplified playlist creation

Simplified file deletion

Playlist duration calculation is now done on the backend (categories uses this now too)

removeIDFromArchive moved from subscriptions->utils

Added plumbing to support type agnostic playlists

backend/utils.js

@@ -202,6 +202,52 @@ function deleteJSONFile(name, type, customPath = null) {
     if (fs.existsSync(alternate_json_path)) fs.unlinkSync(alternate_json_path);
 }
 
+async function removeIDFromArchive(archive_path, id) {
+    let data = await fs.readFile(archive_path, {encoding: 'utf-8'});
+    if (!data) {
+        logger.error('Archive could not be found.');
+        return;
+    }
+
+    let dataArray = data.split('\n'); // convert file data in an array
+    const searchKeyword = id; // we are looking for a line, contains, key word id in the file
+    let lastIndex = -1; // let say, we have not found the keyword
+
+    for (let index=0; index<dataArray.length; index++) {
+        if (dataArray[index].includes(searchKeyword)) { // check if a line contains the id keyword
+            lastIndex = index; // found a line includes a id keyword
+            break;
+        }
+    }
+
+    const line = dataArray.splice(lastIndex, 1); // remove the keyword id from the data Array
+
+    // UPDATE FILE WITH NEW DATA
+    const updatedData = dataArray.join('\n');
+    await fs.writeFile(archive_path, updatedData);
+    if (line) return line;
+    if (err) throw err;
+}
+
+function durationStringToNumber(dur_str) {
+    if (typeof dur_str === 'number') return dur_str;
+    let num_sum = 0;
+    const dur_str_parts = dur_str.split(':');
+    for (let i = dur_str_parts.length-1; i >= 0; i--) {
+      num_sum += parseInt(dur_str_parts[i])*(60**(dur_str_parts.length-1-i));
+    }
+    return num_sum;
+}
+
+function getMatchingCategoryFiles(category, files) {
+    return files && files.filter(file => file.category && file.category.uid === category.uid);
+}
+
+function addUIDsToCategory(category, files) {
+    const files_that_match = getMatchingCategoryFiles(category, files);
+    category['uids'] = files_that_match.map(file => file.uid);
+    return files_that_match;
+}
 
 async function recFindByExt(base,ext,files,result)
 {
@@ -268,8 +314,12 @@ module.exports = {
     getExpectedFileSize: getExpectedFileSize,
     fixVideoMetadataPerms: fixVideoMetadataPerms,
     deleteJSONFile: deleteJSONFile,
+    removeIDFromArchive, removeIDFromArchive,
     getDownloadedFilesByType: getDownloadedFilesByType,
     createContainerZipFile: createContainerZipFile,
+    durationStringToNumber: durationStringToNumber,
+    getMatchingCategoryFiles: getMatchingCategoryFiles,
+    addUIDsToCategory: addUIDsToCategory,
     recFindByExt: recFindByExt,
     removeFileExtension: removeFileExtension,
     wait: wait,