/
Communicator.cs
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/
Communicator.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Net;
using System.Text;
using Newtonsoft.Json;
namespace Parse
{
internal static class Communicator
{
public const string Get = "GET";
public const string Put = "PUT";
public const string Post = "POST";
public const string Delete = "DELETE";
private static readonly JsonSerializerSettings _jsonSettings = new JsonSerializerSettings { DefaultValueHandling = DefaultValueHandling.Ignore, };
public static void SendQueryPayload<T>(string method, string endPoint, Action<Response<T>> callback)
{
SendQueryPayload(method, endPoint, null, false, callback);
}
public static void SendQueryPayload<T>(string method, string endPoint, bool includeMasterKey, Action<Response<T>> callback)
{
SendQueryPayload(method, endPoint, null, includeMasterKey, callback);
}
public static void SendQueryPayload<T>(string method, string endPoint, IDictionary<string, object> payload, Action<Response<T>> callback)
{
SendQueryPayload(method, endPoint, payload == null ? null : DictionaryToQueryString(payload), callback);
}
public static void SendQueryPayload<T>(string method, string endPoint, string query, Action<Response<T>> callback)
{
SendQueryPayload(method, endPoint, query, false, callback);
}
public static void SendQueryPayload<T>(string method, string endPoint, string query, bool includeMasterKey, Action<Response<T>> callback)
{
var request = BuildRequest(method, endPoint, query, callback);
if (request != null)
{
if (includeMasterKey)
{
request.Headers["X-Parse-Master-Key"] = ParseConfiguration.Configuration.MasterKey;
}
request.BeginGetResponse(GetResponseStream<T>, new RequestState<T> { Request = request, Callback = callback });
}
}
public static void SendDataPayload<T>(string method, string endPoint, string payload, Action<Response<T>> callback)
{
SendDataPayload(method, endPoint, payload, "application/json", callback);
}
public static void SendDataPayload<T>(string method, string endPoint, string payload, string contentType, Action<Response<T>> callback)
{
SendDataPayload(method, endPoint, Encoding.UTF8.GetBytes(payload), contentType, callback);
}
public static void SendDataPayload<T>(string method, string endPoint, byte[] payload, string contentType, Action<Response<T>> callback)
{
var request = BuildRequest(method, endPoint, null, callback);
if (request != null)
{
request.ContentType = contentType;
request.BeginGetRequestStream(GetRequestStream<T>, new RequestState<T> { Request = request, Payload = payload, Callback = callback });
}
}
private static HttpWebRequest BuildRequest<T>(string method, string endPoint, string queryString, Action<Response<T>> callback)
{
var configuration = ParseConfiguration.Configuration;
if (!configuration.NetworkCheck())
{
if (callback != null) { callback(Response<T>.CreateError(new ErrorMessage { Message = "Network is not available" })); }
return null;
}
var url = string.Concat(configuration.Url, ParseConfiguration.ApiVersion, "/", endPoint);
if (queryString != null)
{
url += string.Concat('?', queryString);
}
var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = method;
request.UserAgent = "parse-dotnet";
request.Headers["X-Parse-Application-Id"] = configuration.ApplicationId;
request.Headers["X-Parse-REST-API-Key"] = configuration.RestApiKey;
return request;
}
private static void GetRequestStream<T>(IAsyncResult result)
{
var state = (RequestState<T>)result.AsyncState;
using (var requestStream = state.Request.EndGetRequestStream(result))
{
requestStream.Write(state.Payload, 0, state.Payload.Length);
requestStream.Flush();
requestStream.Close();
}
state.Request.BeginGetResponse(GetResponseStream<T>, state);
}
private static void GetResponseStream<T>(IAsyncResult result)
{
var state = (ResponseState<T>)result.AsyncState;
try
{
using (var response = (HttpWebResponse)state.Request.EndGetResponse(result))
{
if (state.Callback != null) { state.Callback(Response<T>.CreateSuccess(GetResponseBody(response))); }
}
}
catch (Exception ex)
{
if (state.Callback != null) { state.Callback(Response<T>.CreateError(HandleException(ex))); }
}
}
private static string DictionaryToQueryString(IEnumerable<KeyValuePair<string, object>> payload)
{
var sb = new StringBuilder();
foreach (var kvp in payload)
{
if (kvp.Value == null) { continue; }
var valueType = kvp.Value.GetType();
if (!typeof(string).IsAssignableFrom(valueType) && typeof(IEnumerable).IsAssignableFrom(valueType))
{
sb.Append(Serialize(kvp.Key, (IEnumerable) kvp.Value));
}
else
{
sb.Append(SerializeSingleParameter(kvp.Key, kvp.Value.ToString()));
}
}
return sb.Remove(sb.Length - 1, 1).ToString();
}
private static string Serialize(string key, IEnumerable values)
{
var sb = new StringBuilder();
foreach(var value in values)
{
sb.Append(SerializeSingleParameter(key, value.ToString()));
}
return sb.ToString();
}
private static string SerializeSingleParameter(string key, string value)
{
return string.Concat(key, '=', Uri.EscapeDataString(value), '&');
}
private static string GetResponseBody(WebResponse response)
{
using (var stream = response.GetResponseStream())
{
var sb = new StringBuilder();
int read;
var bufferSize = response.ContentLength == -1 ? 2048 : (int)response.ContentLength;
if (bufferSize == 0) { return null; }
do
{
var buffer = new byte[2048];
read = stream.Read(buffer, 0, buffer.Length);
sb.Append(Encoding.UTF8.GetString(buffer, 0, read));
} while (read > 0);
return sb.ToString();
}
}
private static ErrorMessage HandleException(Exception exception)
{
if (exception is WebException)
{
var response = ((WebException) exception).Response;
if (response == null)
{
return new ErrorMessage {Message = "Null response (wakeup from rehydrating (multitasking)?)", InnerException = exception};
}
var body = GetResponseBody(response);
try
{
var message = JsonConvert.DeserializeObject<ErrorMessage>(body, _jsonSettings);
message.InnerException = exception;
return message;
}
catch (Exception)
{
return new ErrorMessage { Message = body, InnerException = exception };
}
}
return new ErrorMessage { Message = "Unknown Error", InnerException = exception };
}
private class ResponseState<T>
{
public HttpWebRequest Request { get; set; }
public Action<Response<T>> Callback { get; set; }
}
private class RequestState<T> : ResponseState<T>
{
public byte[] Payload { get; set; }
}
}
}