/// <summary>
/// Evaluates the function.
/// </summary>
/// <param name="Argument1">Function argument 1.</param>
/// <param name="Argument2">Function argument 2.</param>
/// <param name="Variables">Variables collection.</param>
/// <returns>Function result.</returns>
public override IElement Evaluate(IElement Argument1, IElement Argument2, Variables Variables)
{
if (!(Argument1.AssociatedObjectValue is byte[] Data))
{
throw new ScriptRuntimeException("Binary data expected.", this);
}
if (!(Argument2.AssociatedObjectValue is byte[] Key))
{
throw new ScriptRuntimeException("Binary key expected.", this);
}
return(new ObjectValue(Hashes.ComputeHMACSHA1Hash(Key, Data)));
}
/// <summary>
/// Signs the form (if necessary), according to XEP-0348.
/// </summary>
/// <param name="FormSignatureKey">Form signature key.</param>
/// <param name="FormSignatureSecret">Form signature secret.</param>
public void Sign(string FormSignatureKey, string FormSignatureSecret)
{
Field oauth_version = this["oauth_version"];
Field oauth_signature_method = this["oauth_signature_method"];
Field oauth_token = this["oauth_token"];
Field oauth_token_secret = this["oauth_token_secret"];
Field oauth_nonce = this["oauth_nonce"];
Field oauth_timestamp = this["oauth_timestamp"];
Field oauth_consumer_key = this["oauth_consumer_key"];
Field oauth_signature = this["oauth_signature"];
if (oauth_version != null &&
oauth_signature_method != null &&
oauth_token != null &&
oauth_token_secret != null &&
oauth_nonce != null &&
oauth_timestamp != null &&
oauth_consumer_key != null &&
oauth_signature != null)
{
SortedDictionary <string, string> Sorted = new SortedDictionary <string, string>();
DateTime Now = DateTime.Now.ToUniversalTime();
TimeSpan Span = Now - OAuthFirstDay;
long TotalSeconds = (long)Span.TotalSeconds;
string Nonce = Guid.NewGuid().ToString().Replace("-", string.Empty);
string TokenSecret = oauth_token_secret.ValueString;
oauth_consumer_key.SetValue(FormSignatureKey);
oauth_timestamp.SetValue(TotalSeconds.ToString());
oauth_nonce.SetValue(Nonce);
oauth_version.SetValue("1.0");
oauth_signature_method.SetValue("HMAC-SHA1");
foreach (Field F in this.fields)
{
Sorted[F.Var] = F.ValueString;
}
Sorted.Remove("oauth_token_secret");
Sorted.Remove("oauth_signature");
StringBuilder PStr = new StringBuilder();
bool First = true;
foreach (KeyValuePair <string, string> Pair in Sorted)
{
if (First)
{
First = false;
}
else
{
PStr.Append("&");
}
PStr.Append(OAuthEncode(Pair.Key));
PStr.Append("=");
PStr.Append(OAuthEncode(Pair.Value));
}
StringBuilder BStr = new StringBuilder();
BStr.Append("submit&&"); // No to-field.
BStr.Append(OAuthEncode(PStr.ToString()));
byte[] Key = Encoding.ASCII.GetBytes(OAuthEncode(FormSignatureSecret) + "&" + OAuthEncode(TokenSecret));
byte[] Hash = Hashes.ComputeHMACSHA1Hash(Key, Encoding.ASCII.GetBytes(BStr.ToString()));
oauth_signature.SetValue(OAuthEncode(Convert.ToBase64String(Hash)));
}
}
