/// <summary>
/// Initializes a new instance of the <see cref="Proxy"/> class.
/// </summary>
/// <param name="proxyType">The <see cref="Type"/> of the remote object for which to create a proxy.</param>
/// <param name="configuration">Proxy configuration information.</param>
internal Proxy(Type proxyType, ProxyConfiguration configuration)
: base(proxyType)
{
this.Configuration = configuration;
this.Context = new ProxyContext();
this.m_jsonSerializer = JsonSerializer.Create(new JsonSerializerSettings()
{
DateFormatHandling = DateFormatHandling.IsoDateFormat,
ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
NullValueHandling = NullValueHandling.Include,
ConstructorHandling = ConstructorHandling.AllowNonPublicDefaultConstructor,
ContractResolver = new ProxyContractResolver()
});
ResourceAttribute resourceUrlAttribute = proxyType.GetCustomAttribute <ResourceAttribute>();
if (null == this.Configuration.Relative)
{
if (null != resourceUrlAttribute)
{
this.Configuration.Relative = resourceUrlAttribute.Relative;
if (this.Configuration.Relative.Length != 0 && !this.Configuration.Relative.EndsWith("/", StringComparison.OrdinalIgnoreCase))
{
this.Configuration.Relative += "/";
}
}
else
{
var invariantCulture = System.Globalization.CultureInfo.InvariantCulture;
this.Configuration.Relative = string.Format(invariantCulture, "api/{0}/", proxyType.Name.ToLower(invariantCulture));
}
}
if (!this.Configuration.Root.EndsWith("/", StringComparison.OrdinalIgnoreCase))
{
this.Configuration.Root += "/";
}
}
public override IMessage Invoke(IMessage msg)
{
IMethodCallMessage methodCall = msg as IMethodCallMessage;
var invariantCulture = System.Globalization.CultureInfo.InvariantCulture;
if (null != methodCall)
{
try
{
HttpMethod httpMethod = HttpMethod.Get;
HttpMethodAttribute httpMethodAttribute = methodCall.MethodBase.GetCustomAttribute <HttpMethodAttribute>(true);
if (null != httpMethodAttribute)
{
httpMethod = httpMethodAttribute.HttpMethod;
}
ResourceAttribute resourceUrlAttribute = methodCall.MethodBase.GetCustomAttribute <ResourceAttribute>(true);
string actionUrl = string.Empty;
if (null != resourceUrlAttribute)
{
actionUrl = resourceUrlAttribute.Relative;
}
Type expectedReturn = ((MethodInfo)methodCall.MethodBase).ReturnType;
object retVal = null;
object[] outArgs = null;
Dictionary <string, object> toSerialize = new Dictionary <string, object>();
Dictionary <string, string> toQueryString = new Dictionary <string, string>();
// Determines which arguments should be used in the querystring parameters, and which arguments will be serialized and posted.
for (int argIndex = 0, argCount = methodCall.InArgCount; argIndex < argCount; argIndex++)
{
object value = methodCall.GetInArg(argIndex);
if (null == value || value.GetType().IsPrimitiveOrBasicStruct())
{
if (null != value && value is DateTime)
{
value = ((DateTime)value).ToLocalTime();
StringBuilder sb = new StringBuilder();
using (TextWriter writer = new StringWriter(sb, invariantCulture))
{
this.m_jsonSerializer.Serialize(writer, value);
}
value = sb.ToString();
value = ((string)value).Substring(1, ((string)value).Length - 2);
toQueryString.Add(methodCall.GetInArgName(argIndex), (value != null) ? value.ToString() : string.Empty);
}
else
{
toQueryString.Add(methodCall.GetInArgName(argIndex), (value != null) ? HttpUtility.UrlEncode(value.ToString()) : string.Empty);
}
}
else
{
toSerialize.Add(methodCall.GetInArgName(argIndex), value);
}
}
{
// Prepare the post content.
byte[] postData = null;
string responseData;
if (toSerialize.Count > 0)
{
StringBuilder sb = new StringBuilder();
using (TextWriter writer = new StringWriter(sb, invariantCulture))
{
if (toSerialize.Count == 1)
{
this.m_jsonSerializer.Serialize(writer, toSerialize.Values.First());
}
else
{
this.m_jsonSerializer.Serialize(writer, toSerialize);
}
}
postData = Encoding.UTF8.GetBytes(sb.ToString());
}
if ((postData == null || postData.Length == 0) && httpMethod != HttpMethod.Get)
{
postData = Encoding.UTF8.GetBytes("{}");
}
// Assemble the querystring.
object[] urlParameters = null;
if (null != resourceUrlAttribute && resourceUrlAttribute.ParameterNames.Count() > 0)
{
urlParameters = new object[resourceUrlAttribute.ParameterNames.Count()];
for (int i = 0, total = resourceUrlAttribute.ParameterNames.Count(); i < total; i++)
{
string parameterName = resourceUrlAttribute.ParameterNames[i];
if (toQueryString.ContainsKey(parameterName))
{
urlParameters[i] = toQueryString[parameterName];
toQueryString.Remove(parameterName);
}
else if (toSerialize.ContainsKey(parameterName))
{
urlParameters[i] = toSerialize[parameterName];
toSerialize.Remove(parameterName);
}
}
}
var queryString = string.Empty;
if (toQueryString.Count > 0)
{
queryString = "?" + string.Join("&", (from kvp in toQueryString select kvp.Key + "=" + kvp.Value).ToArray());
}
// Determine the final url
if (null != urlParameters)
{
actionUrl = string.Format(invariantCulture, actionUrl, urlParameters);
}
string serviceUrl = this.Configuration.Root + this.Configuration.Relative + actionUrl + queryString;
// Create the request context
RequestContext context = this.Context.CreateRequestContext();
context.RequestUrl = new Uri(serviceUrl);
// Create and configure the HTTP request
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(context.RequestUrl);
{
webRequest.Method = httpMethod.ToString().ToUpper();
webRequest.Timeout = this.Configuration.RequestTimeout ?? (5 * 60 * 1000);
if (null != this.Configuration.RequestHeaders)
{
foreach (var kvp in this.Configuration.RequestHeaders)
{
webRequest.Headers[kvp.Key] = kvp.Value;
}
}
if (null != postData && postData.Length > 0)
{
webRequest.ContentLength = postData.Length;
webRequest.ContentType = "application/json; charset=UTF-8";
Stream postStream = webRequest.GetRequestStream();
postStream.Write(postData, 0, postData.Length);
postStream.Close();
}
}
HttpWebResponse response = null;
{
Stopwatch timer = Stopwatch.StartNew();
try
{
// Add a HTTP header with a random number to help tracking the request here and on the remote server
int randomNumber = new Random().Next(int.MaxValue);
webRequest.Headers["X-SP-Unique-Identifier"] = randomNumber.ToString(invariantCulture);
// Send the request
response = (HttpWebResponse)webRequest.GetResponse();
}
catch (WebException ex)
{
string errorContent = null;
if (ex.Response != null)
{
context.ResponseStatus = (int)((HttpWebResponse)ex.Response).StatusCode;
if (ex.Response.ContentLength != 0)
{
using (var stream = ex.Response.GetResponseStream())
{
if (null != stream)
{
using (var reader = new StreamReader(stream))
{
errorContent = reader.ReadToEnd();
context.ResponseSize = errorContent.Length;
}
}
}
string errorResult = null;
if (null != errorContent)
{
using (StringReader r = new StringReader(errorContent))
{
errorResult = r.ReadToEnd();
}
}
if (!string.IsNullOrWhiteSpace(errorResult))
{
context.ResponseContent = errorResult;
throw new ProxyException(errorResult, (HttpWebResponse)ex.Response);
}
}
}
throw new ProxyException(string.Format(invariantCulture, "Exception caught while performing a {0} request to url '{1}'. {2}: {3}", httpMethod.ToString(), serviceUrl, ex.GetType().Name, ex.Message), ex);
}
finally
{
var elapsedMilliseconds = timer.ElapsedMilliseconds;
timer.Stop();
context.RequestElapsedMilliseconds = elapsedMilliseconds;
context.RequestElapsedTime = new TimeSpan(0, 0, 0, 0, (int)elapsedMilliseconds);
}
context.ResponseHeaders.Clear();
// Add the response information to the context
for (int index = 0, total = response.Headers.Count; index < total; index++)
{
context.ResponseHeaders[response.Headers.GetKey(index)] = response.Headers.Get(index);
}
context.ResponseStatus = (int)response.StatusCode;
if ((int)response.StatusCode >= 400)
{
throw new ProxyException("Invalid HTTP status code.", response);
}
// Read the response contents
Stream responseStream = response.GetResponseStream();
using (StreamReader responseReader = new StreamReader(responseStream))
{
responseData = responseReader.ReadToEnd();
// note: context.ResponseSize should be in bytes, not string length
// ContentLength should be length reported in the Content-Length header (number of octets)
context.ResponseSize = response.ContentLength;
context.ResponseContent = responseData;
responseReader.Close();
}
responseStream.Close();
response.Close();
}
// Attempt to deserialize the response contents
if (context.ResponseHeaders.ContainsKey("Content-Type"))
{
string contentType = (context.ResponseHeaders["Content-Type"] ?? string.Empty).Split(';').FirstOrDefault(h => !h.Trim().StartsWith("charset", StringComparison.OrdinalIgnoreCase));
string temp = contentType.Split('/').Last();
if (temp.EndsWith("json", StringComparison.OrdinalIgnoreCase) || temp.EndsWith("javascript", StringComparison.OrdinalIgnoreCase))
{
using (StringReader r = new StringReader(responseData))
{
using (JsonReader r2 = new JsonTextReader(r))
{
r2.DateTimeZoneHandling = DateTimeZoneHandling.Utc;
if (expectedReturn != typeof(void))
{
retVal = this.m_jsonSerializer.Deserialize(r2, expectedReturn);
}
}
}
}
else
{
throw new ProxyException("Unknown response content type: " + contentType, response);
}
}
}
int outArgsCount = null != outArgs ? outArgs.Length : 0;
IMethodReturnMessage callResult = new ReturnMessage(retVal, outArgs, outArgsCount, methodCall.LogicalCallContext, methodCall);
return(callResult);
}
catch (Exception e)
{
return(new ReturnMessage(e, methodCall));
}
}
else
{
throw new NotSupportedException();
}
}
