protected override async Task <string> DownloadAsyncInner(CookieAwareWebClient client,
FlexibleLoaderGetPreferredDestinationCallback getPreferredDestination,
FlexibleLoaderReportDestinationCallback reportDestination, Func <bool> checkIfPaused,
IProgress <long> progress, CancellationToken cancellation)
{
using (client.SetDebugMode(OptionDebugMode))
using (client.SetAutoRedirect(!OptionManualRedirect)) {
return(await base.DownloadAsyncInner(client, getPreferredDestination, reportDestination, checkIfPaused, progress, cancellation));
}
}
public override async Task <bool> PrepareAsync(CookieAwareWebClient client, CancellationToken cancellation)
{
Logging.Debug(Url);
if (!Url.Contains("://drive.google.com/uc?", StringComparison.OrdinalIgnoreCase))
{
return(true);
}
// First of all, let’s see if there is an HTML-file under that link
Logging.Debug("GET request is coming…");
string webPageContent;
using (client.SetAutoRedirect(false))
using (var stream = await client.OpenReadTaskAsync(Url)) {
if (cancellation.IsCancellationRequested)
{
return(false);
}
// If file is freely available to download, server should redirect user to downloading
var location = client.ResponseHeaders?.Get("Location");
if (location != null)
{
Url = location;
FileName = new Uri(Url, UriKind.RelativeOrAbsolute).GetQueryParam("id");
Logging.Debug("Download URL is ready: " + location);
client.LogResponseHeaders();
return(true);
}
Logging.Debug("Content-Type: " + client.ResponseHeaders?.Get("Content-Type"));
if (client.ResponseHeaders?.Get("Content-Type").Contains("text/html", StringComparison.OrdinalIgnoreCase) == false)
{
return(true);
}
// Looks like it’s a webpage, now we need to download and parse it
webPageContent = (await stream.ReadAsBytesAsync()).ToUtf8String();
if (cancellation.IsCancellationRequested)
{
return(false);
}
Logging.Debug("…done");
}
var doc = new HtmlDocument();
doc.LoadHtml(webPageContent);
var link = doc.DocumentNode.SelectSingleNode(@"//a[contains(@href, 'export=download')]").Attributes[@"href"].Value;
if (link == null)
{
NonfatalError.Notify(ToolsStrings.Common_CannotDownloadFile, ToolsStrings.DirectLoader_GoogleDriveChanged);
return(false);
}
Url = @"https://drive.google.com" + HttpUtility.HtmlDecode(link);
FileName = HttpUtility.HtmlDecode(doc.DocumentNode.SelectSingleNode(@"//span[@class='uc-name-size']/a")?.InnerText?.Trim());
Logging.Write($"Google Drive download link: {Url}");
try {
var totalSize = HttpUtility.HtmlDecode(
doc.DocumentNode.SelectSingleNode(@"//span[@class='uc-name-size']/text()")?.InnerText?.Trim(' ', '(', ')'));
Logging.Write($"Total size: {totalSize}");
if (totalSize != null && LocalizationHelper.TryParseReadableSize(totalSize, null, out var size))
{
Logging.Write($"Parsed size: {size} bytes");
TotalSize = size;
}
} catch (Exception e) {
Logging.Warning(e);
}
if (OptionManualRedirect)
{
using (client.SetDebugMode(OptionDebugMode))
using (client.SetAutoRedirect(false)) {
var redirect = await client.DownloadStringTaskAsync(Url);
Logging.Debug(redirect);
if (!redirect.Contains("<TITLE>Moved Temporarily</TITLE>"))
{
NonfatalError.Notify(ToolsStrings.Common_CannotDownloadFile, ToolsStrings.DirectLoader_GoogleDriveChanged);
return(false);
}
var redirectMatch = Regex.Match(redirect, @"href=""([^""]+)", RegexOptions.IgnoreCase);
if (!redirectMatch.Success)
{
NonfatalError.Notify(ToolsStrings.Common_CannotDownloadFile, ToolsStrings.DirectLoader_GoogleDriveChanged);
return(false);
}
Url = HttpUtility.HtmlDecode(redirectMatch.Groups[1].Value);
Logging.Debug(Url);
}
}
return(true);
}