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Webshare file download URL generator from file id and name

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This commit is contained in:
Roman Vaníček
2024-11-09 02:22:09 +01:00
parent 3bb46cdfb1
commit 804e5e91a0
2 changed files with 75 additions and 8 deletions
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8
Program.cs
View File

@@ -3,9 +3,13 @@ using JellyfinCinemaStream.Webshare;
class Program
{
private static void Main(string[] args)
public static HttpClient _http = new HttpClient();
private static async Task Main(string[] args)
{
string a = LinkGenerator.CalculatePassword(downloadId: "12kRBqAYQS2", downloadName: "bIaFGdkvKiiTBo2_S3E", salt: "UX8y8Fpa");
CancellationToken cancel = default;
//string a = LinkGenerator.CalculatePassword(fileId: "2kRBqAYQS2", fileName: "bIaFGdkvKiiTBo2_S3E1", salt: "UX8y8Fpa");
Uri a = await LinkGenerator.GenerateDownloadLinkAsync(fileId: "2kRBqAYQS2", fileName: "bIaFGdkvKiiTBo2_S3E1", cancel);
Console.WriteLine(a);
}
}

75
Webshare/LinkGenerator.cs
View File

@@ -1,23 +1,86 @@
using System;
using System.Security.Cryptography;
using System.Text;
using System.Xml;
namespace JellyfinCinemaStream.Webshare;
public class LinkGenerator
{
private static readonly BaseEncoding UnixMD5 = new BaseEncoding("./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", false);
private static readonly Uri WebshareApiUri = new Uri("https://webshare.cz/api/");
/// <summary>
/// Generates a download link for the given Webshare download.
/// </summary>
/// <param name="fileId">Webshare file identifier.</param>
/// <param name="fileName">Webshare file name.</param>
/// <param name="cancel">Asynchronous cancellation.</param>
/// <returns>Time-limited download link.</returns>
public async static Task<Uri> GenerateDownloadLinkAsync(string fileId, string fileName, CancellationToken cancel)
{
// Obtain the download password salt
// Example response: <?xml version="1.0" encoding="UTF-8"?><response><status>OK</status><salt>UX8y8Fpa</salt><app_version>30</app_version></response>
Uri saltUri = new Uri(WebshareApiUri, "file_password_salt/");
HttpResponseMessage saltRes = await Program._http.PostAsync(saltUri, new FormUrlEncodedContent(new [] { new KeyValuePair<string, string>("ident", fileId) }), cancel);
if (!saltRes.IsSuccessStatusCode)
throw new IOException("Failed to get password salt from Webshare API.");
XmlReader saltR = XmlReader.Create(saltRes.Content.ReadAsStream());
saltR.ReadStartElement("response");
ThrowIfStatusNotOK(saltR);
string salt = saltR.ReadElementContentAsString("salt", "");
saltR.ReadElementContentAsString("app_version", "");
saltR.ReadEndElement(); // response
// Calculate the download password
string password = CalculatePassword(fileId, fileName, salt);
// Obtain the download link
// Example response: <?xml version="1.0" encoding="UTF-8"?><response><status>OK</status><link>https://free.19.dl.wsfiles.cz/9209/...</link><app_version>30</app_version></response>
Uri linkUri = new Uri(WebshareApiUri, "file_link/");
HttpResponseMessage linkRes = await Program._http.PostAsync(linkUri, new FormUrlEncodedContent(new [] {
new KeyValuePair<string, string>("ident", fileId),
new KeyValuePair<string, string>("download_type", "video_stream"),
new KeyValuePair<string, string>("device_uuid", Guid.NewGuid().ToString("X")),
new KeyValuePair<string, string>("device_res_x", "3840"),
new KeyValuePair<string, string>("device_res_y", "2160"),
new KeyValuePair<string, string>("password", password),
}), cancel
);
if (!linkRes.IsSuccessStatusCode)
throw new IOException("Failed to get download link from Webshare API.");
XmlReader linkR = XmlReader.Create(linkRes.Content.ReadAsStream());
linkR.ReadStartElement("response");
ThrowIfStatusNotOK(linkR);
string link = linkR.ReadElementContentAsString("link", "");
linkR.ReadElementContentAsString("app_version", "");
linkR.ReadEndElement(); // response
return new Uri(link);
}
private static void ThrowIfStatusNotOK(XmlReader r) {
string status = r.ReadElementContentAsString("status", "");
if (status == "OK")
return;
string code = r.ReadElementContentAsString("code", "");
string message = r.ReadElementContentAsString("message", "");
throw new IOException(code + ": " + message);
}
/// <summary>
/// Calculates the Webshare download password from download identifier, name and salt.
/// Calculates the Webshare download password from file identifier, name and salt.
/// </summary>
/// <param name="downloadId">Webshare download identifier.</param>
/// <param name="downloadName">Webshare download name.</param>
/// <param name="fileId">Webshare file identifier.</param>
/// <param name="fileName">Webshare file name.</param>
/// <param name="salt">Download salt obtained from https://webshare.cz/api/file_password_salt/.</param>
/// <returns>Password to use to obtain a download link using https://webshare.cz/api/file_link/.</returns>
public static string CalculatePassword(string downloadId, string downloadName, string salt)
private static string CalculatePassword(string fileId, string fileName, string salt)
{
if (downloadId == null || downloadName == null || salt == null)
if (fileId == null || fileName == null || salt == null)
throw new ArgumentNullException();
// Example
@@ -26,7 +89,7 @@ public class LinkGenerator
// password = sha256(name + id) = "1e98873b57b7660cba7267c191f2d1fb7d198d062eb2fe0686502883042c4105"
// crypt = md5crypt(password, salt: "UX8y8Fpa") = "$1$UX8y8Fpa$stY.bUYGBsmAlc6IIxnHU0"
// result = sha1(crypt) = "8ceff8e5abf9aa375a8a5b05871b6cd6fb7fd185")
string toHash = downloadName + downloadId;
string toHash = fileName + fileId;
byte[] password = SHA256.HashData(Encoding.UTF8.GetBytes(toHash));
string passwordS = Convert.ToHexStringLower(password);
string crypt = MD5Crypt(passwordS, salt);