BDBOAuth1Manager POST with JSON payload

DiscogsAPIClient.swift

//
//  DiscogsSessionManager.swift
//
//  Copyright (c) 2015 Bradley David Bergeron
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy of
//  this software and associated documentation files (the "Software"), to deal in
//  the Software without restriction, including without limitation the rights to
//  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
//  the Software, and to permit persons to whom the Software is furnished to do so,
//  subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
//  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
//  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
//  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
//  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import Foundation
import BDBOAuth1Manager

class DiscogsAPIClient {
    let networkManager: BDBOAuth1SessionManager
    
    init(consumerKey: String, secret: String) {
        var baseURL = NSURL(string: "https://api.discogs.com/")
        self.networkManager = BDBOAuth1SessionManager(baseURL: baseURL, consumerKey: consumerKey, consumerSecret: secret)
    }
    
    func createListing (parameters: [String : AnyObject], completion: (listingInfo: AnyObject!, error: NSError!) -> Void) -> NSURLSessionDataTask! {
        return self.networkManager.POSTJSON("/marketplace/listings",
            parameters: parameters,
            success: { (task, responseObject) -> Void in
                completion(listingInfo: responseObject, error: nil)
            },
            failure: { (task, error) -> Void in
                completion(listingInfo: nil, error: error)
            }
        )
    }

    func deleteListing (listingID: Int, completion: (error: NSError!) -> Void) -> NSURLSessionDataTask! {
        return self.networkManager.DELETE("/marketplace/listings/\(listingID)",
            parameters: nil,
            success: { (task, responseObject) -> Void in
                completion(error: nil)
            },
            failure: { (task, error) -> Void in
                completion(error: error)
            }
        )
    }
}

DiscogsSessionClient.swift

//
//  DiscogsSessionManager.swift
//
//  Copyright (c) 2015 Bradley David Bergeron
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy of
//  this software and associated documentation files (the "Software"), to deal in
//  the Software without restriction, including without limitation the rights to
//  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
//  the Software, and to permit persons to whom the Software is furnished to do so,
//  subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
//  FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
//  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
//  IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
//  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import Foundation
import BDBOAuth1Manager

class DiscogsSessionManager: BDBOAuth1SessionManager {
    func POSTJSON(URLString: String!, parameters: AnyObject!, success: ((NSURLSessionDataTask!, AnyObject!) -> Void)!, failure: ((NSURLSessionDataTask!, NSError!) -> Void)!) -> NSURLSessionDataTask! {
        var serializationError: NSError?
        let request = self.requestSerializer.requestWithMethod("POST",
            URLString: NSURL(string: URLString, relativeToURL: self.baseURL)?.absoluteString,
            parameters: nil,
            error: &serializationError)

        if let serializationError = serializationError {
            if let failure = failure {
                dispatch_async(self.completionQueue ?? dispatch_get_main_queue()) {
                    failure(nil, serializationError)
                }
            }

            return nil
        }

        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.HTTPBody = NSJSONSerialization.dataWithJSONObject(parameters, options: NSJSONWritingOptions.allZeros, error: &serializationError)

        if let serializationError = serializationError {
            if let failure = failure {
                dispatch_async(self.completionQueue ?? dispatch_get_main_queue()) {
                    failure(nil, serializationError)
                }
            }

            return nil
        }

        var task: NSURLSessionDataTask!
        task = self.dataTaskWithRequest(request, completionHandler: { (response, responseObject, error) -> Void in
            if let error = error {
                if let failure = failure {
                    failure(task, error)
                }
            } else {
                if let success = success {
                    success(task, responseObject)
                }
            }
        })
        task.resume()
        
        return task
    }
}