Alamofire SwiftyJSON Serializer

AlamofireSwiftyJSONSerializer.swift

//
//  AlamofireSwiftyJSONSerializer.swift
//
//  Created by Thanh Pham on 7/21/16.
//

import Alamofire
import SwiftyJSON

extension Request {

    internal static func newError(code: Error.Code, failureReason: String) -> NSError {
        let errorDomain = "com.alamofireswiftyjson.error"

        let userInfo = [NSLocalizedFailureReasonErrorKey: failureReason]
        let returnError = NSError(domain: errorDomain, code: code.rawValue, userInfo: userInfo)

        return returnError
    }

    public func responseSwiftyJSON(queue queue: dispatch_queue_t? = nil, keyPath: String? = nil, completionHandler: Response<JSON, NSError> -> Void) -> Self {
        return response(queue: queue, responseSerializer: Request.SwiftyJSONSerializer(), completionHandler: completionHandler)
    }

    public static func SwiftyJSONSerializer() -> ResponseSerializer<JSON, NSError> {
        return ResponseSerializer { request, response, data, error in
            guard error == nil else {
                return .Failure(error!)
            }

            guard let data = data else {
                let failureReason = "Data could not be serialized. Input data was nil."
                let error = newError(.DataSerializationFailed, failureReason: failureReason)
                return .Failure(error)
            }

            var dataError: NSError?
            let json = JSON(data: data, error: &dataError)

            guard dataError == nil else {
                return .Failure(dataError!)
            }

            return .Success(json)
        }
    }
}