We Keep Coding

Gmail API Message Payload.Data Comes Empty

I'm trying to read the messages from the Google API but when I check the Payload.Body.Data to see the content of the email always comes null.
But when I use Raw format I see the body but it's a little complicated to handle the information because it's in a huge and dirty string.
public static Message GetMessage(GmailService service, String userId, String messageId)
{
try
{
var request = service.Users.Messages.Get(userId, messageId);
request.Format = Google.Apis.Gmail.v1.UsersResource.MessagesResource.GetRequest.FormatEnum.Full;
var message = request.Execute();
return message;
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
return null;
}

Send message with actionresult

I need to return the server error from azure functions.
Now I implement the same using InternalServerErrorResult(). It only sends the error code and no response/message can be sent with this function.
How to implement an exception handler where the error code and message can be sent together using actionresult in azure functions
current implementation
catch (Exception ex)
{
log.LogInformation("An error occured {0}" + ex);
//json = new Response(ex.StackTrace, AppConstants.ErrorCodes.SystemException).SerializeToString();
return (ActionResult)new InternalServerErrorResult();
}
this returns with an empty response in postman with error 500

Note that this is from Microsoft.AspNetCore.Mvc namespace:
var result = new ObjectResult(new { error = "your error message here" })
{
StatusCode = 500
};
Based on configured formatters it will return serialized object to client.
For JSON (it's default) it will return following:
{ "error" : "your error message here" }

To send a message with the status code you can use return StatusCode(httpCode, message), which is an ObjectResult.
For example:
return StatusCode(500, "An error occurred");
You can also pass an object (example using HttpStatusCode enum):
return StatusCode((int)HttpStatusCode.InternalServerError, json);

Twilio TwiML app XML error

I have a TwiML app with this code in the Connect action of the CallController. This code is taken straight from the Twilio demos.
[HttpPost]
public virtual ActionResult Connect(string phoneNumber, string called)
{
var response = new VoiceResponse();
var dial = new Dial(callerId: "+6138595????");
if (phoneNumber != null)
{
dial.Number(phoneNumber);
}
else
{
dial.Client("support_agent");
}
response.Dial(dial);
return TwiML(response);
}
When this is called it raises the error "Data at the root level is invalid. Line 1, position 1."
The XML this generates is
<?xml version="1.0" encoding="utf-8"?>
<Response>
<Dial callerId="+6138595????">
<Client>support_agent</Client>
</Dial>
</Response>

Twilio Evangelist here.
A quick question - is this happening every time the method is invoked, or only when specific inputs are provided? Needing to build the string manually is of course not desired. So I would like to get to the bottom of what triggered this result.

I have found I can fix it by replacing
return TwiML(response);
with
return new TwiMLResult(response.ToString(), new UTF8Encoding());
Appears to be some kind of encoding issue using the first method.

I had the same problem we solved it in our WebApi by skipping the Twilio sdk and generating the xml by ourselves.
I hope this will work for you too:
[HttpPost]
public virtual HttpResponseMessage Connect(string phoneNumber, string called)
{
string twiml = $"<?xml version=\"1.0\" encoding=\"utf-8\"?><Response><Dial callerId=\"{phoneNumber}\"><Client>support_agent</Client></Dial></Response>";
var xmlResponse = new HttpResponseMessage();
xmlResponse.Content = new StringContent(twiml, Encoding.UTF8, "text/xml");
return xmlResponse;
}
Please notice that there are no end of lines - "\n", \r", etc.

How to return error message from Catch block. Right now empty is returned

My sample code of ApiKey validation is given below (I am using MVC4 web api RC):
public class ApiKeyFilter : ActionFilterAttribute
{
public override void OnActionExecuting(HttpActionContext context)
{
//read api key from query string
string querystring = context.Request.RequestUri.Query;
string apikey = HttpUtility.ParseQueryString(querystring).Get("apikey");
//if no api key supplied, send out validation message
if (string.IsNullOrWhiteSpace(apikey))
{
var response = context.Request.CreateResponse(HttpStatusCode.Unauthorized, new Error { Message = "You can't use the API without the key." });
throw new HttpResponseException(response);
}
else
{
try
{
GetUser(decodedString); //error occurred here
}
catch (Exception)
{
var response = context.Request.CreateResponse(HttpStatusCode.Unauthorized, new Error { Message = "User with api key is not valid" });
throw new HttpResponseException(response);
}
}
}
}
Here problem is with Catch block statement. I Just wanted to send custom error message to user. But nothing is sent. It displays a blank screen
However, the statement below is working well and sends out the validation error message correctly:
if (string.IsNullOrWhiteSpace(apikey))
{
var response = context.Request.CreateResponse(HttpStatusCode.Unauthorized, new Error { Message = "You can't use the API without the key." });
throw new HttpResponseException(response);
}
Is there anything that i am doing wrong.

I was having the same issue in the exact same scenario. However, in this scenario, you need to return some content in your response to be shown and not really throw the exception. So based on this, I would change your code to the following:
catch (Exception)
{
var response = context.Request.CreateResponse(httpStatusCode.Unauthorized);
response.Content = new StringContent("User with api key is not valid");
context.Response = response;
}
So with this change you are now returning your response, with content that will displayed in place of the blank screen.

WCF set custom header - reading not working

I need to put custom headers into WCF. My Code is as follows:
ServiceReference1.Service2Client ws = new Service2Client();
using (OperationContextScope scope = new OperationContextScope((IContextChannel)ws.InnerChannel))
{
MessageHeaders messageHeadersElement = OperationContext.Current.OutgoingMessageHeaders;
messageHeadersElement.Add(MessageHeader.CreateHeader("Authorization", String.Empty, "string"));
messageHeadersElement.Add(MessageHeader.CreateHeader("username", String.Empty, "user"));
var res = ws.GetUser("123");
}
But when I try to read it in the service, nothing is availabe in the following
public class OAuthAuthorizationManager : ServiceAuthorizationManager
{
protected override bool CheckAccessCore(OperationContext operationContext)
{
int index = OperationContext.Current.IncomingMessageHeaders.FindHeader("username", String.Empty);
string auth = operationContext.IncomingMessageHeaders.GetHeader<string>("username", String.Empty);
var hereIseeIt = operationContext.RequestContext.RequestMessage;
index is -1: not found
auth: is also displaying an exception that the header is not available
hereIseeIt: .ToString() shows a xml where I can see that user is existent, but I see no way to access that information in any of the objects
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<username xmlns="http://Microsoft.WCF.Documentation">user</username>
</s:Header>
<s:Body>
<GetUser xmlns="http://tempuri.org/">
<UserId>123</UserId>
</GetUser>
</s:Body>
</s:Envelope>
But I cannot access them since I find no way to access the s:Header ...

try using:
XPathNavigator XPN = operationContext.RequestContext.RequestMessage.CreateBufferedCopy ().CreateNavigator ();
NOT elegant but it gives you the whole Message accessible through a XPathNavigator which should make it easy to get to any value inside the Message you want..
some links:
http://msdn.microsoft.com/en-us/library/system.servicemodel.channels.requestcontext.aspx
http://msdn.microsoft.com/en-us/library/system.servicemodel.channels.message.aspx
http://msdn.microsoft.com/en-us/library/system.xml.xpath.xpathnavigator.aspx

Here's an easy way to get the inner XML of the username header for your scenario. Even if you already solved your issue a long time ago, I thought it might help somebody else who faces the same issue.
var username = String.Empty;
// using the namespace from you XML sample
var usernameHeaderPosition = OperationContext.Current
.IncomingMessageHeaders
.FindHeader("username", "http://Microsoft.WCF.Documentation");
if (usernameHeaderPosition > -1)
{
username = OperationContext.Current
.IncomingMessageHeaders
.GetReaderAtHeader(usernameHeaderPosition).ReadInnerXml();
}