private void HandleWebException(VkFunction function, WebException ex, VkRestContext context)
{
if (ex.Status == WebExceptionStatus.ProtocolError)
{
var statusCode = (int)((HttpWebResponse)ex.Response).StatusCode;
var responseStream = ex.Response.GetResponseStream();
var responseText = responseStream!= null ? (new StreamReader(responseStream)).ReadToEnd() : "";
var args = new OnErrorEventArgs(function, context, statusCode, responseText);
OnError(this, args);
}
else
{
var args = new OnErrorEventArgs(function, context, CriticalErrorCode, CriticalErrorText, ex.Message);
OnError(this, args);
}
}
// make REST call to VK services
private void MakeRestCall(VkFunction function, String uri, VkRestContext context)
{
if (OnData == null || OnError == null)
throw new ArgumentException("OnData and OnError handlers must be provided");
try
{
// Create URI
var address = new Uri(uri);
Debug.WriteLine("REST call: " + address);
// Create the web request
var request = WebRequest.Create(address) as HttpWebRequest;
if (request == null)
{
var args = new OnErrorEventArgs(function, context, CriticalErrorCode, CriticalErrorText, "Request object is null");
OnError(this, args);
return;
}
// Set type to Get
request.Method = GetMethod;
request.ContentType = ContentType;
request.Accept = ContentAccept;
// Get response
using (var response = request.GetResponse() as HttpWebResponse)
{
if (response == null)
{
var args = new OnErrorEventArgs(function, context, CriticalErrorCode, CriticalErrorText, "Response object is null");
OnError(this, args);
return;
}
var responseStream = response.GetResponseStream();
if (responseStream == null)
{
var args = new OnErrorEventArgs(function, context, CriticalErrorCode, CriticalErrorText, "Response stream is null");
OnError(this, args);
return;
}
var responseCode = (int)response.StatusCode;
if (responseCode < 300)
{
string responseBody;
try
{
responseBody = ((new StreamReader(responseStream)).ReadToEnd());
}
catch (IOException e)
{
var args = new OnErrorEventArgs(function, context, CriticalErrorCode,
CriticalErrorText, e.Message);
OnError(this, args);
return;
}
//var contentType = response.ContentType;
var o = JObject.Parse(responseBody);
if (o[ResponseBody] != null)
{
var args = new OnDataEventArgs(function, o, context.Cookie);
OnData(this, args);
}
else if (o[ErrorBody] != null)
{
long code = 0;
var error = "";
if (o[ErrorBody]["error_code"] != null)
{
code = o[ErrorBody]["error_code"].ToObject<long>();
}
if (o[ErrorBody]["error_msg"] != null)
{
error = o[ErrorBody]["error_msg"].ToString();
}
var args = new OnErrorEventArgs(function, context, code, error, o[ErrorBody].ToString());
OnError(this, args);
}
}
else
{
var args = new OnErrorEventArgs(function, context, CriticalErrorCode, CriticalErrorText, "Unexpected response code: " + responseCode);
OnError(this, args);
}
}
}
catch (WebException exception)
{
HandleWebException(function, exception, context);
}
}
private void MakeVkCall( Method method, VkRestContext context)
{
var sb = new StringBuilder(ApiUrl);
sb.Append(method.Name).Append('?');
if (method.UserParam.Length > 0)
{
// if method uses user id - get id name from method and user id from context
sb.Append(method.UserParam).Append("=").Append(context.UserId).Append('&');
}
if (!method.IsOpen)
{
// if method is secure - apply access token from context
sb.Append("access_token=").Append(context.AuthToken).Append('&');
}
if (context.Parameters.Length > 0)
{
// apply additional parameters from the context
sb.Append(context.Parameters).Append('&');
}
sb.Append("v=").Append(method.Version).Append('&');
sb.Append("lang=").Append(context.Lang);
// make rest call
MakeRestCall(method.Fid, sb.ToString(), context);
}
// functions switch
public void CallVkFunction(VkFunction function, VkRestContext context)
{
switch (function)
{
case VkFunction.GetProfiles:
MakeVkCall(GetProfiles, context);
break;
case VkFunction.LoadFriends:
MakeVkCall(LoadFriends, context);
break;
case VkFunction.FriendsGet:
MakeVkCall(FriendsGet, context);
break;
case VkFunction.FriendsGetMutual:
MakeVkCall(FriendsGetMutual, context);
break;
case VkFunction.UsersSearch:
MakeVkCall(UsersSearch, context);
break;
case VkFunction.WallGet:
MakeVkCall(WallGet, context);
break;
case VkFunction.WallGetComments:
MakeVkCall(WallGetComments, context);
break;
case VkFunction.StatsGet:
MakeVkCall(StatsGet, context);
break;
case VkFunction.GroupsGetMembers:
MakeVkCall(GroupsGetMembers, context);
break;
case VkFunction.GroupsGetById:
MakeVkCall(GroupsGetById, context);
break;
case VkFunction.LikesGetList:
MakeVkCall(LikesGetList, context);
break;
case VkFunction.UsersGet:
MakeVkCall(UsersGet, context);
break;
case VkFunction.DatabaseGetCountries:
MakeVkCall(DatabaseGetCountries, context);
break;
case VkFunction.DatabaseGetRegions:
MakeVkCall(DatabaseGetRegions, context);
break;
case VkFunction.DatabaseGetCities:
MakeVkCall(DatabaseGetCities, context);
break;
case VkFunction.BoardGetTopics:
MakeVkCall(BoardGetTopics, context);
break;
case VkFunction.BoardGetComments:
MakeVkCall(BoardGetComments, context);
break;
case VkFunction.PhotosSearch:
MakeVkCall(PhotosSearch, context);
break;
}
}
public OnErrorEventArgs(VkFunction function, VkRestContext context, long code, String error, String details)
{
Function = function;
Context = context;
Code = code;
Error = error;
Details = details;
}
public OnErrorEventArgs(VkFunction function, VkRestContext context, long code, String error) :
this(function, context, code, error, "")
{
}
