/// <summary>
/// Builds a memory stream from the response body.
/// </summary>
/// <param name="response">Response message</param>
/// <param name="acceptContentType">Content type to use for serialization</param>
/// <param name="acceptEncoding">Response encoding</param>
/// <returns>Memory stream from data serialized by content type</returns>
private static MemoryStream BuildSuccessResponse(Response response, RequestContentType acceptContentType, Encoding acceptEncoding)
{
var bodyString = string.Empty;
// If Body is null, just return empty response
if (response?.Body == null)
{
return new MemoryStream(acceptEncoding.GetBytes(bodyString))
{
Position = 0
}
}
;
if (response.Body.Payload.XmlData != null)
{
switch (acceptContentType)
{
case RequestContentType.Json:
// Remove the namespace attributes:
response.Body.Payload.XmlData.Attributes.RemoveNamedItem("xmlns");
response.Body.Payload.XmlData.Attributes.RemoveNamedItem("xmlns:xsd");
response.Body.Payload.XmlData.Attributes.RemoveNamedItem("xmlns:xsi");
bodyString = Json.JsonConverter.ConvertFromXml(response.Body.Payload.XmlData);
break;
case RequestContentType.Xml:
bodyString = response.Body.Payload.XmlData.OuterXml;
break;
}
}
else if (!string.IsNullOrEmpty(response.Body.Payload.Data))
{
bodyString = XmlString.Decode(response.Body.Payload.Data);
}
return(new MemoryStream(acceptEncoding.GetBytes(bodyString))
{
Position = 0
});
}
public async Task <Response> CallOperationAsync(Request request)
{
Response resp;
// Send the request to the interface:
HttpMethod requestMethod;
UriBuilder url;
var bodyString = "";
string contentType;
var httpClient = new HttpClient();
try
{
// Settings defined in the input messages override the values set in the step parameters!
// Set the request method:
if (string.IsNullOrWhiteSpace(request.Method))
{
requestMethod = _method ?? HttpMethod.Get;
}
else
{
requestMethod = GetDeliveryMethod(request.Method);
}
// Set the base URL:
url = string.IsNullOrWhiteSpace(request.Url?.BaseUrl)
? new UriBuilder(_url)
: new UriBuilder(request.Url.BaseUrl);
// Add the URL parameters:
if (request.Url?.Query != null)
{
var query = string.IsNullOrWhiteSpace(url.Query) ? "" : url.Query.Substring(1);
foreach (var parameter in request.Url.Query)
{
if (!string.IsNullOrWhiteSpace(query))
{
query += "&";
}
query += parameter.Name + "=" + parameter.Value;
}
url.Query = query;
}
// Set the content type:
if (string.IsNullOrWhiteSpace(request.Body?.ContentType))
{
contentType = string.IsNullOrWhiteSpace(_contentType)
? "application/xml; charset=utf-8"
: _contentType;
}
else
{
contentType = request.Body.ContentType;
}
// Get the body:
if (request.Body?.Payload != null)
{
if (request.Body.Payload.XmlData != null)
{
bodyString = contentType.Contains("application/json")
? Json.JsonConverter.ConvertFromXml(request.Body.Payload.XmlData)
: request.Body.Payload.XmlData.OuterXml;
}
else if (request.Body.Payload.FormData != null && request.Body.Payload.FormData.Count > 0)
{
foreach (var param in request.Body.Payload.FormData)
{
if (!string.IsNullOrWhiteSpace(bodyString))
{
bodyString += "&";
}
bodyString += HttpUtility.UrlEncode(param.Name) + "=" + HttpUtility.UrlEncode(param.Value);
}
}
else if (!string.IsNullOrWhiteSpace(request.Body.Payload.Data))
{
bodyString = XmlString.Decode(request.Body.Payload.Data);
}
}
// Set authorization settings:
if ((request.Authentication != null) &&
(request.Authentication.Type == AuthenticationType.Basic) &&
(request.Authentication.Credentials != null))
{
var authorizationString = string.Join(":", request.Authentication.Credentials.UserName, request.Authentication.Credentials.Password);
var byteArray = Encoding.ASCII.GetBytes(authorizationString);
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));
}
else if ((AuthenticationType == AuthenticationType.Basic) &&
(Credentials != null))
{
var authorizationString = string.Join(":", Credentials.UserName, Credentials.Password);
var byteArray = Encoding.ASCII.GetBytes(authorizationString);
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray));
}
// Set the request headers:
if (request.Headers != null)
{
foreach (var h in request.Headers)
{
httpClient.DefaultRequestHeaders.Add(h.Name, h.Value);
}
}
// Set the timeout if it was defined:
if (request.Timeout.HasValue)
{
httpClient.Timeout = TimeSpan.FromSeconds(request.Timeout.Value);
}
}
catch (Exception ex)
{
throw new Exception("Initializing the REST request failed.", ex);
}
HttpResponseMessage response;
// Execute the REST request:
using (httpClient)
{
try
{
response = await ExecuteRestRequestAsync(httpClient, requestMethod, url.Uri, bodyString, contentType);
}
catch (Exception ex)
{
throw new Exception("Sending the request failed.", ex);
}
if (((int)response.StatusCode < 200) || ((int)response.StatusCode >= 300))
{
throw new Exception("The server responded with an error " + (int)response.StatusCode + ": " + response.ReasonPhrase);
}
}
// Handle the response:
try
{
resp = new Response {
Id = request.Id
};
using (response)
{
resp.StatusCode = ((int)response.StatusCode).ToString(CultureInfo.InvariantCulture);
resp.StatusMessage = response.ReasonPhrase;
// If the response has content, read it & convert it to XML if necessary
if (response.Content?.Headers?.ContentType?.MediaType != null)
{
using (var stream = await response.Content.ReadAsStreamAsync())
using (var reader = new StreamReader(stream))
{
resp.Body = new Body
{
ContentType = response.Content.Headers.ContentType.MediaType,
Encoding = response.Content.Headers.ContentType.CharSet,
Payload = new Payload()
};
if (response.Content.Headers.ContentType.MediaType.StartsWith("application/json") ||
response.Content.Headers.ContentType.MediaType.StartsWith("application/javascript") ||
response.Content.Headers.ContentType.MediaType.StartsWith("application/x-json") ||
response.Content.Headers.ContentType.MediaType.StartsWith("application/x-javascript") ||
response.Content.Headers.ContentType.MediaType.StartsWith("text/json") ||
response.Content.Headers.ContentType.MediaType.StartsWith("text/javascript") ||
response.Content.Headers.ContentType.MediaType.StartsWith("text/x-json") ||
response.Content.Headers.ContentType.MediaType.StartsWith("text/x-javascript"))
{
// Convert JSON to XML
// Read the response to a string:
resp.Body.Payload.Data = await reader.ReadToEndAsync();
// Convert the string to XML:
var responseXml = Json.JsonConverter.ConvertToXml(resp.Body.Payload.Data);
resp.Body.Payload.XmlData = responseXml.DocumentElement;
}
else if (response.Content.Headers.ContentType.MediaType.StartsWith("text/html"))
{
// content-type text/html is a bit tricky. you never know what you get.
// essentially we're making our own root-element, so the response can be xml/text/json/whateva
var responseString = await reader.ReadToEndAsync();
using (var xmlReader = XmlReader.Create(new StringReader(
$"<Response>{System.Security.SecurityElement.Escape(responseString)}</Response>")))
{
var xmlDoc = new XmlDocument();
xmlDoc.Load(xmlReader);
resp.Body.Payload.XmlData = xmlDoc.DocumentElement;
}
}
else
{
// Read the response to XML:
using (var xmlReader = XmlReader.Create(reader))
{
var xmlDoc = new XmlDocument();
xmlDoc.Load(xmlReader);
resp.Body.Payload.XmlData = xmlDoc.DocumentElement;
}
}
}
}
}
}
catch (Exception ex)
{
throw new Exception("Reading the response failed.", ex);
}
return(resp);
}
