/// <summary>
/// Encodes an HTTP response that will instruct the user agent to forward a message to
/// some remote third party using a form POST method.
/// </summary>
/// <param name="message">The message to forward.</param>
/// <param name="fields">The pre-serialized fields from the message.</param>
/// <returns>The encoded HTTP response.</returns>
protected virtual UserAgentResponse CreateFormPostResponse(IDirectedProtocolMessage message, IDictionary <string, string> fields)
{
ErrorUtilities.VerifyArgumentNotNull(message, "message");
ErrorUtilities.VerifyArgumentNamed(message.Recipient != null, "message", MessagingStrings.DirectedMessageMissingRecipient);
ErrorUtilities.VerifyArgumentNotNull(fields, "fields");
WebHeaderCollection headers = new WebHeaderCollection();
StringWriter bodyWriter = new StringWriter(CultureInfo.InvariantCulture);
StringBuilder hiddenFields = new StringBuilder();
foreach (var field in fields)
{
hiddenFields.AppendFormat(
"\t<input type=\"hidden\" name=\"{0}\" value=\"{1}\" />\r\n",
HttpUtility.HtmlEncode(field.Key),
HttpUtility.HtmlEncode(field.Value));
}
bodyWriter.WriteLine(
indirectMessageFormPostFormat,
HttpUtility.HtmlEncode(message.Recipient.AbsoluteUri),
hiddenFields);
bodyWriter.Flush();
UserAgentResponse response = new UserAgentResponse {
Status = HttpStatusCode.OK,
Headers = headers,
Body = bodyWriter.ToString(),
OriginalMessage = message
};
return(response);
}
/// <summary>
/// Queues an indirect message for transmittal via the user agent.
/// </summary>
/// <param name="message">The message to send.</param>
/// <returns>The pending user agent redirect based message to be sent as an HttpResponse.</returns>
protected virtual UserAgentResponse SendIndirectMessage(IDirectedProtocolMessage message)
{
ErrorUtilities.VerifyArgumentNotNull(message, "message");
var serializer = MessageSerializer.Get(message.GetType());
var fields = serializer.Serialize(message);
// First try creating a 301 redirect, and fallback to a form POST
// if the message is too big.
UserAgentResponse response = this.Create301RedirectResponse(message, fields);
if (response.Headers[HttpResponseHeader.Location].Length > indirectMessageGetToPostThreshold)
{
response = this.CreateFormPostResponse(message, fields);
}
return(response);
}
/// <summary>
/// Encodes an HTTP response that will instruct the user agent to forward a message to
/// some remote third party using a 301 Redirect GET method.
/// </summary>
/// <param name="message">The message to forward.</param>
/// <param name="fields">The pre-serialized fields from the message.</param>
/// <returns>The encoded HTTP response.</returns>
protected virtual UserAgentResponse Create301RedirectResponse(IDirectedProtocolMessage message, IDictionary <string, string> fields)
{
ErrorUtilities.VerifyArgumentNotNull(message, "message");
ErrorUtilities.VerifyArgumentNamed(message.Recipient != null, "message", MessagingStrings.DirectedMessageMissingRecipient);
ErrorUtilities.VerifyArgumentNotNull(fields, "fields");
WebHeaderCollection headers = new WebHeaderCollection();
UriBuilder builder = new UriBuilder(message.Recipient);
MessagingUtilities.AppendQueryArgs(builder, fields);
headers.Add(HttpResponseHeader.Location, builder.Uri.AbsoluteUri);
Logger.DebugFormat("Redirecting to {0}", builder.Uri.AbsoluteUri);
UserAgentResponse response = new UserAgentResponse {
Status = HttpStatusCode.Redirect,
Headers = headers,
Body = null,
OriginalMessage = message
};
return(response);
}
