public IActionResult OnPost(string shortenedUrl, string password)
{
if (shortenedUrl.Length > 5)
{
var mapping = _context.CustomMapping.Find(Base62.Decode(shortenedUrl));
if (password != mapping.Password)
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
else
{
VideoSource = "/StreamSource?shortenedUrl=" + shortenedUrl + "password="******"video/" + mapping.Original.Split(".").Last();
return(Page());
}
}
else
{
var mapping = _context.Mapping.Find(Base62.Decode(shortenedUrl));
if (password != mapping.Password)
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
else
{
VideoSource = "/StreamSource?shortenedUrl=" + shortenedUrl + "&password="******"video/" + mapping.Original.Split(".").Last();
return(Page());
}
}
}
public ActionResult StreamSource(string shortenedUrl, string password)
{
if (shortenedUrl.Length > 5)
{
var mapping = _context.CustomMapping.Find(Base62.Decode(shortenedUrl));
if (password != mapping.Password)
{
return(BadRequest());
}
else
{
return(PhysicalFile(mapping.Original, "application/octet-stream", true));
}
}
else
{
var mapping = _context.Mapping.Find(Base62.Decode(shortenedUrl));
if (password != mapping.Password)
{
return(BadRequest());
}
else
{
return(PhysicalFile(mapping.Original, "application/octet-stream", true));
}
}
}
public IActionResult OnPost(string shortenedUrl, string password)
{
if (shortenedUrl.Length > 5)
{
var mapping = _context.CustomMapping.Find(Base62.Decode(shortenedUrl));
if (password != mapping.Password)
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
else
{
ImageBase64String = "data:image/" + Path.GetExtension(mapping.Original).Substring(1) + ";base64," +
Extension.ConvertToBase64(new FileStream(mapping.Original, FileMode.Open, FileAccess.Read));
return(Page());
}
}
else
{
var mapping = _context.Mapping.Find(Base62.Decode(shortenedUrl));
if (password != mapping.Password)
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
else
{
ImageBase64String = "data:image/" + Path.GetExtension(mapping.Original).Substring(1) + ";base64," +
Extension.ConvertToBase64(new FileStream(mapping.Original, FileMode.Open, FileAccess.Read));
return(Page());
}
}
}
public ActionResult OnGet(string shortenedUrl)
{
if (shortenedUrl.Length > 5)
{
var mapping = _context.CustomMapping.Find(Base62.Decode(shortenedUrl));
if (!string.IsNullOrWhiteSpace(mapping.Password))
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
else
{
VideoSource = "/StreamSource?shortenedUrl=" + shortenedUrl;
VideoType = "video/" + mapping.Original.Split(".").Last();
return(Page());
}
}
else
{
var mapping = _context.Mapping.Find(Base62.Decode(shortenedUrl));
if (!string.IsNullOrWhiteSpace(mapping.Password))
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
else
{
VideoSource = "/StreamSource?shortenedUrl=" + shortenedUrl;
VideoType = "video/" + mapping.Original.Split(".").Last();
return(Page());
}
}
}
private void PostAuthenticateRequest(object sender, EventArgs e)
{
var url = HttpContext.Current.Request.Path;
var rootPathLength = Utils.ApplicationPath.Length;
url = url.Length > rootPathLength?url.Substring(rootPathLength) : string.Empty;
if (!url.StartsWith("!"))
{
return;
}
try {
var pageInstanceId = Base62.Decode(url.Substring(1));
var pageUrl = PageFactory.GetUrlForPageInstanceId(pageInstanceId);
if (string.IsNullOrEmpty(pageUrl))
{
return;
}
var response = HttpContext.Current.Response;
response.Status = "301 Moved Permanently";
response.AddHeader("Location", pageUrl);
response.End();
}
catch {
// Let the rest of the URL handlers take care of this URL
}
}
public IActionResult Decode([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "encoder/decode")] HttpRequest req)
{
if (!req.QueryString.HasValue)
{
return(new BadRequestObjectResult(Properties.Resources.Encoder_MissingDecodeQuery));
}
return(new OkObjectResult(Base62.Decode(req.QueryString.Value.TrimStart('?'))));
}
public IActionResult OnGet(string shortenedUrl)
{
if (shortenedUrl == null)
{
return(Page());
}
else
{
if (shortenedUrl.Length > 5)
{
var mapping = _context.CustomMapping.Find(Base62.Decode(shortenedUrl));
if (mapping == null)
{
ErrorMessage = "Not Found";
return(Page());
}
if (!string.IsNullOrWhiteSpace(mapping.Password))
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
return(Redirect(mapping.Original));
}
else
{
var mapping = _context.Mapping.Find(Base62.Decode(shortenedUrl));
if (mapping == null)
{
ErrorMessage = "Not Found";
return(Page());
}
if (!string.IsNullOrWhiteSpace(mapping.Password))
{
return(RedirectToPage("./VerifyPassword", new { shortenedUrl = shortenedUrl }));
}
if (mapping.MappingType == MappingType.URL)
{
return(Redirect(mapping.Original));
}
else if (mapping.MappingType == MappingType.IMAGE)
{
return(RedirectToPage("./ImageContent", new { shortenedUrl = shortenedUrl }));
}
else if (mapping.MappingType == MappingType.VIDEO)
{
return(RedirectToPage("./VideoContent", new { shortenedUrl = shortenedUrl }));
}
else if (mapping.MappingType == MappingType.AUDIO)
{
return(RedirectToPage("./AudioContent", new { shortenedUrl = shortenedUrl }));
}
else
{
return(BadRequest());
}
}
}
}
/// <summary>
/// Branca specification level token decryption.
/// </summary>
/// <param name="token">Base62 encoded Branca token</param>
/// <param name="key">32-byte private key used to encrypt and decrypt the Branca token</param>
/// <returns>Pared and decrypted Branca Token</returns>
public virtual BrancaToken DecryptToken(string token, byte[] key)
{
if (string.IsNullOrWhiteSpace(token))
{
throw new ArgumentNullException(nameof(token));
}
if (!CanReadToken(token))
{
throw new InvalidCastException("Unable to read token");
}
if (!IsValidKey(key))
{
throw new InvalidOperationException("Invalid decryption key");
}
var tokenBytes = Base62.Decode(token);
using (var stream = new MemoryStream(tokenBytes, false))
{
// header
var header = GuaranteedRead(stream, 29);
byte[] nonce;
uint timestamp;
using (var headerStream = new MemoryStream(header))
{
// version
var version = headerStream.ReadByte();
if (version != 0xBA)
{
throw new SecurityTokenException("Unsupported Branca version");
}
// timestamp (big endian uint32)
var timestampBytes = GuaranteedRead(headerStream, 4).Reverse().ToArray();
timestamp = BitConverter.ToUInt32(timestampBytes, 0);
// nonce
nonce = GuaranteedRead(headerStream, 24);
}
// ciphertext
var ciphertextLength = stream.Length - stream.Position - TagLength;
var ciphertext = GuaranteedRead(stream, (int)ciphertextLength);
var tag = GuaranteedRead(stream, TagLength);
var plaintext = new byte[ciphertextLength];
new XChaCha20Poly1305(key).Decrypt(nonce, ciphertext, tag, plaintext, header);
return(new BrancaToken(
Encoding.UTF8.GetString(plaintext),
timestamp));
}
}
public void WithRandomBytes_ExpectCorrectValuesEncoded()
{
var bytes = new byte[128];
var rng = RandomNumberGenerator.Create();
rng.GetBytes(bytes);
var encodedBytes = Base62.Encode(bytes);
Base62.Decode(encodedBytes).Should().BeEquivalentTo(bytes);
}
public void CreateToken_WhenTokenGenerated_ExpectBas62EncodedTokenWithCorrectLength()
{
var payload = Guid.NewGuid().ToString();
var handler = new BrancaTokenHandler();
var token = handler.CreateToken(payload, validKey);
token.Any(x => !Base62.CharacterSet.Contains(x)).Should().BeFalse();
Base62.Decode(token).Length.Should().Be(
System.Text.Encoding.UTF8.GetBytes(payload).Length + 29 + 16);
}
public void ValidateToken_CiphertextModification_ExpectSecurityTokenException()
{
var handler = new BrancaTokenHandler();
var token = handler.CreateToken("test", key);
var decoded = Base62.Decode(token);
decoded[decoded.Length - 17] ^= 1; // Last byte before the Poly1305 tag
Assert.Throws <CryptographicException>(() => handler.DecryptToken(Base62.Encode(decoded), key));
}
public void WithUtf8Characters_ExpectCorrectValuesEncoded(string testValue, string expectedResult)
{
var testBytes = System.Text.Encoding.UTF8.GetBytes(testValue);
var result = Base62.Encode(testBytes);
result.Should().Be(expectedResult);
var decodedBytes = Base62.Decode(result);
decodedBytes.Should().BeEquivalentTo(testBytes);
}
static void Main(string[] args)
{
for (int i = 0; i < 100; i++)
{
string str = Base62.Encode(i);
Console.Write($"{str}:{Base62.Decode(str)}\t");
if (i % 10 == 0)
{
Console.WriteLine();
}
}
Console.ReadKey();
}
public static string Decompress(string compressedUrl, Dictionary <string, string> hostConversions = null)
{
InitHuffmanTree();
byte[] urlBytes = Base62.Decode(compressedUrl);
urlBytes = ChecksumCheck(urlBytes);
urlBytes = _huffmanTree.Decode(urlBytes);
string url = Encoding.ASCII.GetString(urlBytes);
Url oUrl = Url.CreateFromShortString(url);
// "Decompress" protocol
if (oUrl.Protocol == "#")
{
oUrl.Protocol = "http";
}
else if (oUrl.Protocol == "$")
{
oUrl.Protocol = "https";
}
else if (oUrl.Protocol == "F")
{
oUrl.Protocol = "ftp";
}
else
{
throw new Exception(string.Format("Unkown protocol \"{0}\"", oUrl.Protocol));
}
if (hostConversions != null)
{
// "Decompress" hosts
string[] urlHostParts = oUrl.Host.Split('.');
for (int i = 0; i < urlHostParts.Length; i++)
{
foreach (KeyValuePair <string, string> hostConversion in hostConversions)
{
if (urlHostParts[i] == hostConversion.Value)
{
urlHostParts[i] = hostConversion.Key;
break;
}
}
}
oUrl.Host = string.Join(".", urlHostParts);
}
url = oUrl.ToString();
return(url);
}
public async Task <IActionResult> OnGet(string shortenedUrl)
{
if (shortenedUrl.Length > 5)
{
var mapping = await _context.CustomMapping.FindAsync(Base62.Decode(shortenedUrl));
if (mapping.MappingType == MappingType.URL)
{
FormAction = "/VerifyPassword";
}
else if (mapping.MappingType == MappingType.IMAGE)
{
FormAction = "/ImageContent";
}
else if (mapping.MappingType == MappingType.VIDEO)
{
FormAction = "/VideoContent";
}
else if (mapping.MappingType == MappingType.AUDIO)
{
FormAction = "/AudioContent";
}
}
else
{
var mapping = await _context.Mapping.FindAsync(Base62.Decode(shortenedUrl));
if (mapping.MappingType == MappingType.URL)
{
FormAction = "/VerifyPassword";
}
else if (mapping.MappingType == MappingType.IMAGE)
{
FormAction = "/ImageContent";
}
else if (mapping.MappingType == MappingType.VIDEO)
{
FormAction = "/VideoContent";
}
else if (mapping.MappingType == MappingType.AUDIO)
{
FormAction = "/AudioContent";
}
}
ShortenedUrl = shortenedUrl;
return(Page());
}
public async Task <IActionResult> OnPost(string shortenedUrl, string password)
{
if (shortenedUrl.Length > 5)
{
var mapping = await _context.CustomMapping.FindAsync(Base62.Decode(shortenedUrl));
if (mapping == null)
{
return(NotFound());
}
else if (mapping.Password == password)
{
return(Redirect(mapping.Original));
}
else
{
ShortenedUrl = shortenedUrl;
ErrorMessage = "Wrong Password!";
return(Page());
}
}
else
{
var mapping = await _context.Mapping.FindAsync(Base62.Decode(shortenedUrl));
if (mapping == null)
{
return(NotFound());
}
else if (mapping.Password == password)
{
return(Redirect(mapping.Original));
}
else
{
ShortenedUrl = shortenedUrl;
ErrorMessage = "Wrong Password!";
return(Page());
}
}
}
/// <summary>
/// Branca specification level token decryption.
/// </summary>
/// <param name="token">Base62 encoded Branca token</param>
/// <param name="key">32-byte private key used to encrypt and decrypt the Branca token</param>
/// <returns>Pared and decrypted Branca Token</returns>
public virtual BrancaToken DecryptToken(string token, byte[] key)
{
if (string.IsNullOrWhiteSpace(token))
{
throw new ArgumentNullException(nameof(token));
}
if (!CanReadToken(token))
{
throw new InvalidCastException("Unable to read token");
}
if (!IsValidKey(key))
{
throw new InvalidOperationException("Invalid decryption key");
}
var tokenBytes = Base62.Decode(token);
using (var stream = new MemoryStream(tokenBytes, false))
{
// header
var header = GuaranteedRead(stream, 29);
byte[] nonce;
uint timestamp;
using (var headerStream = new MemoryStream(header))
{
// version
var version = headerStream.ReadByte();
if (version != 0xBA)
{
throw new SecurityTokenException("Unsupported Branca version");
}
// timestamp
var timestampBytes = GuaranteedRead(headerStream, 4);
timestamp = BitConverter.ToUInt32(timestampBytes, 0);
// nonce
nonce = GuaranteedRead(headerStream, 24);
}
// ciphertext
var ciphertextLength = (stream.Length - 16) - stream.Position;
var ciphertext = GuaranteedRead(stream, (int)ciphertextLength);
// tag
var tag = GuaranteedRead(stream, 16);
// XChaCha20-Poly1305
var keyMaterial = new KeyParameter(key);
var parameters = new ParametersWithIV(keyMaterial, nonce);
var headerMac = new byte[16];
var poly1305 = new Poly1305();
poly1305.Init(keyMaterial);
poly1305.BlockUpdate(header, 0, header.Length);
poly1305.DoFinal(headerMac, 0);
if (!headerMac.SequenceEqual(tag))
{
throw new SecurityTokenException("Invalid message authentication code");
}
var engine = new XChaChaEngine();
engine.Init(false, parameters);
var decryptedPlaintext = new byte[ciphertext.Length];
engine.ProcessBytes(ciphertext, 0, ciphertext.Length, decryptedPlaintext, 0);
return(new BrancaToken(
Encoding.UTF8.GetString(decryptedPlaintext),
timestamp));
}
}
