TweetDuck/Utils/TwitterUtils.cs

using System;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using System.Windows.Forms;
using CefSharp;
using TweetDuck.Browser.Data;
using TweetDuck.Dialogs;
using TweetDuck.Management;
using TweetLib.Core;
using TweetLib.Core.Features.Twitter;
using TweetLib.Core.Utils;
using Cookie = CefSharp.Cookie;

namespace TweetDuck.Utils{
    static class TwitterUtils{
        public static readonly Color BackgroundColor = Color.FromArgb(28, 99, 153);
        public const string BackgroundColorOverride = "setTimeout(function f(){let h=document.head;if(!h){setTimeout(f,5);return;}let e=document.createElement('style');e.innerHTML='body,body::before{background:#1c6399!important;margin:0}';h.appendChild(e);},1)";

        public static readonly ResourceLink LoadingSpinner = new ResourceLink("https://ton.twimg.com/tduck/spinner", ResourceHandlers.ForBytes(Properties.Resources.spinner, "image/apng"));
        
        public static readonly string[] DictionaryWords = {
            "tweetdeck", "TweetDeck", "tweetduck", "TweetDuck", "TD"
        };

        private static void DownloadTempImage(string url, ImageQuality quality, Action<string> process){
            string file = Path.Combine(BrowserCache.CacheFolder, TwitterUrls.GetImageFileName(url) ?? Path.GetRandomFileName());
            
            if (FileUtils.FileExistsAndNotEmpty(file)){
                process(file);
            }
            else{
                DownloadFileAuth(TwitterUrls.GetMediaLink(url, quality), file, () => {
                    process(file);
                }, ex => {
                    FormMessage.Error("Image Download", "An error occurred while downloading the image: " + ex.Message, FormMessage.OK);
                });
            }
        }

        public static void ViewImage(string url, ImageQuality quality){
            DownloadTempImage(url, quality, path => {
                string ext = Path.GetExtension(path);

                if (ImageUrl.ValidExtensions.Contains(ext)){
                    App.SystemHandler.OpenAssociatedProgram(path);
                }
                else{
                    FormMessage.Error("Image Download", "Invalid file extension " + ext, FormMessage.OK);
                }
            });
        }

        public static void CopyImage(string url, ImageQuality quality){
            DownloadTempImage(url, quality, path => {
                Image image;

                try{
                    image = Image.FromFile(path);
                }catch(Exception ex){
                    FormMessage.Error("Copy Image", "An error occurred while copying the image: " + ex.Message, FormMessage.OK);
                    return;
                }

                ClipboardManager.SetImage(image);
            });
        }
        
        public static void DownloadImage(string url, string username, ImageQuality quality){
            DownloadImages(new string[]{ url }, username, quality);
        }

        public static void DownloadImages(string[] urls, string username, ImageQuality quality){
            if (urls.Length == 0){
                return;
            }

            string firstImageLink = TwitterUrls.GetMediaLink(urls[0], quality);
            int qualityIndex = firstImageLink.IndexOf(':', firstImageLink.LastIndexOf('/'));

            string filename = TwitterUrls.GetImageFileName(firstImageLink);
            string ext = Path.GetExtension(filename); // includes dot

            using SaveFileDialog dialog = new SaveFileDialog{
                AutoUpgradeEnabled = true,
                OverwritePrompt = urls.Length == 1,
                Title = "Save Image",
                FileName = qualityIndex == -1 ? filename : $"{username} {Path.ChangeExtension(filename, null)} {firstImageLink.Substring(qualityIndex + 1)}".Trim() + ext,
                Filter = (urls.Length == 1 ? "Image" : "Images") + (string.IsNullOrEmpty(ext) ? " (unknown)|*.*" : $" (*{ext})|*{ext}")
            };

            if (dialog.ShowDialog() == DialogResult.OK){
                static void OnFailure(Exception ex){
                    FormMessage.Error("Image Download", "An error occurred while downloading the image: " + ex.Message, FormMessage.OK);
                }

                if (urls.Length == 1){
                    DownloadFileAuth(firstImageLink, dialog.FileName, null, OnFailure);
                }
                else{
                    string pathBase = Path.ChangeExtension(dialog.FileName, null);
                    string pathExt = Path.GetExtension(dialog.FileName);

                    for(int index = 0; index < urls.Length; index++){
                        DownloadFileAuth(TwitterUrls.GetMediaLink(urls[index], quality), $"{pathBase} {index + 1}{pathExt}", null, OnFailure);
                    }
                }
            }
        }

        public static void DownloadVideo(string url, string username){
            string filename = TwitterUrls.GetFileNameFromUrl(url);
            string ext = Path.GetExtension(filename);

            using SaveFileDialog dialog = new SaveFileDialog{
                AutoUpgradeEnabled = true,
                OverwritePrompt = true,
                Title = "Save Video",
                FileName = string.IsNullOrEmpty(username) ? filename : $"{username} {filename}".TrimStart(),
                Filter = "Video" + (string.IsNullOrEmpty(ext) ? " (unknown)|*.*" : $" (*{ext})|*{ext}")
            };

            if (dialog.ShowDialog() == DialogResult.OK){
                DownloadFileAuth(url, dialog.FileName, null, ex => {
                    FormMessage.Error("Video Download", "An error occurred while downloading the video: " + ex.Message, FormMessage.OK);
                });
            }
        }

        private static void DownloadFileAuth(string url, string target, Action onSuccess, Action<Exception> onFailure){
            const string AuthCookieName = "auth_token";

            TaskScheduler scheduler = TaskScheduler.FromCurrentSynchronizationContext();
            using ICookieManager cookies = Cef.GetGlobalCookieManager();

            cookies.VisitUrlCookiesAsync(url, true).ContinueWith(task => {
                string cookieStr = null;

                if (task.Status == TaskStatus.RanToCompletion){
                    Cookie found = task.Result?.Find(cookie => cookie.Name == AuthCookieName); // the list may be null

                    if (found != null){
                        cookieStr = $"{found.Name}={found.Value}";
                    }
                }

                WebClient client = WebUtils.NewClient(BrowserUtils.UserAgentChrome);
                client.Headers[HttpRequestHeader.Cookie] = cookieStr;
                client.DownloadFileCompleted += WebUtils.FileDownloadCallback(target, onSuccess, onFailure);
                client.DownloadFileAsync(new Uri(url), target);
            }, scheduler);
        }
    }
}