This documentation is for WSO2 Identity Server 5.1.0. View documentation for the latest release.
Sending Custom Error Codes - Identity Server 5.1.0 - WSO2 Documentation
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This page guides you through a mechanism you can use to send custom error codes to the client side in case of defined/identified errors, using a custom grant handler.

This simply uses the mobile grant sample and adds the specific error codes/messages to it. See the Writing a Custom OAuth 2.0 Grant Type topic for instructions on how to implement and use the mobile grant sample before adding the custom error codes to it. 

Resources

The following Maven buildable source is compatible with WSO2 Identity Server 5.1.0 version. The attached .jar file can be directly used as well.

Buildable Sourcecustom-grant.zip
Built Jar Filecustom-grant-1.0.0.jar

Sample Code

The following code segment in the sample class org.wso2.sample.identity.oauth2.grant.mobile.MobileGrant inside validateGrant() method is the relevant code used for this mechanism. 

if(mobileNumber != null) {
    //validate mobile number
    authStatus =  isValidMobileNumber(mobileNumber);

    if(authStatus) {
        // if valid set authorized mobile number as grant user
        AuthenticatedUser mobileUser = new AuthenticatedUser();
        mobileUser.setUserName(mobileNumber);
        oAuthTokenReqMessageContext.setAuthorizedUser(mobileUser);
        oAuthTokenReqMessageContext.setScope(oAuthTokenReqMessageContext.getOauth2AccessTokenReqDTO().getScope());
    } else{
        ResponseHeader responseHeader = new ResponseHeader();
        responseHeader.setKey("SampleHeader-999");
        responseHeader.setValue("Provided Mobile Number is Invalid.");
        oAuthTokenReqMessageContext.addProperty("RESPONSE_HEADERS", new ResponseHeader[]{responseHeader});
    }

}

The code within lines 71-75 sets a custom response header in case an invalid mobile number is sent.

Try out Scenario

Happy Path

curl --user <Client_id>:<Client_secret> -k -d "grant_type=mobile&mobileNumber=0333444" -H "Content-Type: application/x-www-form-urlencoded" https://localhost:9443/oauth2/token

Erroneous Path

curl -v --user vSfeQ9jfNodY1tv9KLNNxLOw7kwa:CEUWu7fDNy_RYg5lO_mp8PLf7nQa -k -d "grant_type=mobile&mobileNumber=0363444" -H "Content-Type: application/x-www-form-urlencoded" https://localhost:9443/oauth2/token

This is erroneous according to the mobile custom grant sample because the mobile number does not start with '003'. You can use the -v option in the cURL command to see the header of the response which should be as seen in the code block below.

> POST /oauth2/token HTTP/1.1
> Authorization: Basic dlNmZVE5amZOb2RZMXR2OUtMTk54TE93N2t3YTpDRVVXdTdmRE55X1JZZzVsT19tcDhQTGY3blFh
> User-Agent: curl/7.29.0
> Host: localhost:9443
> Accept: */*
> Content-Type: application/x-www-form-urlencoded
> Content-Length: 38
> 
* upload completely sent off: 38 out of 38 bytes
< HTTP/1.1 400 Bad Request
< Date: Wed, 13 Jan 2016 06:05:33 GMT
< SampleHeader-999: Provided Mobile Number is Invalid.
< Content-Type: application/json
< Content-Length: 87
< Connection: close
< Server: WSO2 Carbon Server
< 
* Closing connection 0
* SSLv3, TLS alert, Client hello (1):
{"error":"invalid_grant","error_description":"Provided Authorization Grant is invalid"}

Line 12 shows the custom header appearing in the headers.

Similarly this can be used to transfer any custom information to the client, in a flexible manner.