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YouTube Video Player App

 import QtQuick 2.0
 import Felgo 4.0

 Item {
   id: api

   // configure Google Project API Key for YouTube Data API
   property string apiKey: "AIzaSyD3FPmFGDTyO_wHiUVMYSb7MQ4eFeveJw4"

   property bool requestsPending: HttpNetworkActivityIndicator.enabled

   Component.onCompleted: {
     HttpNetworkActivityIndicator.setActivationDelay(0)
   }

   // getChannelIdForUsername
   function getChannelForUsername(name, success, error) {
     var reqUrl = _.getChannelForUsernameRequest.arg(name).arg(apiKey);
     _.sendGetRequest(reqUrl, function(data) {
       if(data && data.items[0])
         success(data.items[0])
       else
         success(undefined)
     }, error)
   }

   // getChannelPlaylists
   function getChannelPlaylists(channelId, success, error) {
     var reqUrl = _.getChannelPlaylistsRequest.arg(channelId).arg(apiKey);
     _.sendGetRequest(reqUrl, function(data) {
       if(data && data.items)
         success(data.items)
       else
         success([])
     }, error)
   }

   function getPlaylistById(playlistId, success, error) {
     var reqUrl = _.getPlaylistByIdRequest.arg(playlistId).arg(apiKey);
     _.sendGetRequest(reqUrl, function(data) {
       if(data && data.items[0])
         success(data.items[0])
       else
         success(undefined)
     }, error)
   }

   // getPlaylistItems
   function getPlaylistItems(playlistId, success, error) {
     var reqUrl = _.getPlaylistItemsRequest.arg(playlistId).arg(apiKey);
     _.sendGetRequest(reqUrl, function(data) {
       if(data && data.items)
         success(data.items)
       else
         success([])
     }, error)
   }

   // getVideos
   function getVideos(videoIds, success, error) {
     var idParam = ""
     if(videoIds.length)  // it's an array
       idParam = videoIds.join()
     else
       idParam = videoIds

     var reqUrl = _.getVideosRequest.arg(idParam).arg(apiKey);
     _.sendGetRequest(reqUrl, function(data) {
       if(data && data.items)
         success(data.items)
       else
         success([])
     }, error)
   }

   // item for private members
   QtObject {
     id: _

     // YouTube API URLs
     property string getChannelForUsernameRequest: "https://www.googleapis.com/youtube/v3/channels?part=id,snippet,brandingSettings,contentDetails&forUsername=%1&key=%2"
     property string getChannelPlaylistsRequest: "https://www.googleapis.com/youtube/v3/playlists?part=snippet,contentDetails&channelId=%1&maxResults=50&key=%2"
     property string getPlaylistByIdRequest: "https://www.googleapis.com/youtube/v3/playlists?part=snippet,contentDetails&id=%1&key=%2"
     property string getPlaylistItemsRequest: "https://www.googleapis.com/youtube/v3/playlistItems?part=snippet,contentDetails,status&playlistId=%1&maxResults=50&key=%2"
     property string getVideosRequest: "https://www.googleapis.com/youtube/v3/videos?part=snippet,contentDetails,status,statistics&id=%1&maxResults=50&key=%2"

     // sendGetRequest - load data from url with success handler
     function sendGetRequest(url, successHandler, errorHandler) {
       HttpRequest.get(url)
       .then(function(response) {
         successHandler(response.body)
       })
       .catch(function(error) {
         console.error("Error: Failed to load data from "+url+", status = "+xmlHttpReq.status+", response = "+XMLHttpRequest.responseText)
         if(errorHandler !== undefined)
           errorHandler(error.response.status, error.message)
       })