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import Foundation
#if APIKIT_DYNAMIC_FRAMEWORK || COCOAPODS
import Result
import Box
#endif
public let APIKitErrorDomain = "APIKitErrorDomain"
public class API {
// configurations
public class var baseURL: NSURL {
fatalError("API.baseURL must be overrided in subclasses.")
}
public class var requestBodyBuilder: RequestBodyBuilder {
return .JSON(writingOptions: nil)
}
public class var responseBodyParser: ResponseBodyParser {
return .JSON(readingOptions: nil)
}
public class var defaultURLSession: NSURLSession {
return internalDefaultURLSession
}
public class var acceptableStatusCodes: Set<Int> {
return Set(200..<300)
}
private static let internalDefaultURLSession = NSURLSession(
configuration: NSURLSessionConfiguration.defaultSessionConfiguration(),
delegate: URLSessionDelegate(),
delegateQueue: nil
)
/// Creates a NSURLRequest instance from the specified HTTP method, path string
/// and parameters dictionary.
///
/// Returns a mutable URL request instance which is meant to be modified in
/// subclasses or in `Request` protocol conforming types.
public class func URLRequest(#method: Method, path: String, parameters: [String: AnyObject] = [:], requestBodyBuilder: RequestBodyBuilder = requestBodyBuilder) -> NSMutableURLRequest? {
if let components = NSURLComponents(URL: baseURL, resolvingAgainstBaseURL: true) {
let request = NSMutableURLRequest()
switch method {
case .GET, .HEAD, .DELETE:
components.query = URLEncodedSerialization.stringFromObject(parameters, encoding: NSUTF8StringEncoding)
default:
switch requestBodyBuilder.buildBodyFromObject(parameters) {
case .Success(let box):
request.HTTPBody = box.value
case .Failure(let box):
return nil
}
}
components.path = (components.path ?? "").stringByAppendingPathComponent(path)
request.URL = components.URL
request.HTTPMethod = method.rawValue
request.setValue(requestBodyBuilder.contentTypeHeader, forHTTPHeaderField: "Content-Type")
request.setValue(responseBodyParser.acceptHeader, forHTTPHeaderField: "Accept")
return request
} else {
return nil
}
}
@availability(*, unavailable, renamed="URLRequest(method:path:parameters:requestBodyBuilder)")
public class func URLRequest(method: Method, _ path: String, _ parameters: [String: AnyObject] = [:], requestBodyBuilder: RequestBodyBuilder = requestBodyBuilder) -> NSURLRequest? {
return URLRequest(method: method, path: path, parameters: parameters, requestBodyBuilder: requestBodyBuilder)
}
// send request and build response object
public class func sendRequest<T: Request>(request: T, URLSession: NSURLSession = defaultURLSession, handler: (Result<T.Response, NSError>) -> Void = {r in}) -> NSURLSessionDataTask? {
let mainQueue = dispatch_get_main_queue()
if let URLRequest = request.URLRequest {
let task = URLSession.dataTaskWithRequest(URLRequest)
task.request = Box(request)
task.completionHandler = { data, URLResponse, connectionError in
if let error = connectionError {
dispatch_async(mainQueue) { handler(.failure(error)) }
return
}
let statusCode = (URLResponse as? NSHTTPURLResponse)?.statusCode ?? 0
if !contains(self.acceptableStatusCodes, statusCode) {
let error = self.responseBodyParser.parseData(data).analysis(
ifSuccess: { self.responseErrorFromObject($0) },
ifFailure: { $0 }
)
dispatch_async(mainQueue) { handler(.failure(error)) }
return
}
let mappedResponse: Result<T.Response, NSError> = self.responseBodyParser.parseData(data).flatMap { rawResponse in
if let response = T.responseFromObject(rawResponse) {
return .success(response)
} else {
let userInfo = [NSLocalizedDescriptionKey: "failed to create model object from raw object."]
let error = NSError(domain: APIKitErrorDomain, code: 0, userInfo: userInfo)
return .failure(error)
}
}
dispatch_async(mainQueue) { handler(mappedResponse) }
}
task.resume()
return task
} else {
let userInfo = [NSLocalizedDescriptionKey: "failed to build request."]
let error = NSError(domain: APIKitErrorDomain, code: 0, userInfo: userInfo)
dispatch_async(mainQueue) { handler(.failure(error)) }
return nil
}
}
public class func cancelRequest<T: Request>(requestType: T.Type, passingTest test: T -> Bool = { r in true }) {
cancelRequest(requestType, URLSession: defaultURLSession, passingTest: test)
}
public class func cancelRequest<T: Request>(requestType: T.Type, URLSession: NSURLSession, passingTest test: T -> Bool = { r in true }) {
URLSession.getTasksWithCompletionHandler { dataTasks, uploadTasks, downloadTasks in
let tasks = (dataTasks + uploadTasks + downloadTasks).filter { task in
var request: T?
switch task {
case let x as NSURLSessionDataTask:
request = x.request?.value as? T
case let x as NSURLSessionDownloadTask:
request = x.request?.value as? T
default:
break
}
if let request = request {
return test(request)
} else {
return false
}
}
for task in tasks {
task.cancel()
}
}
}
public class func responseErrorFromObject(object: AnyObject) -> NSError {
let userInfo = [NSLocalizedDescriptionKey: "received status code that represents error"]
let error = NSError(domain: APIKitErrorDomain, code: 0, userInfo: userInfo)
return error
}
}
// MARK: - default implementation of URLSessionDelegate
public class URLSessionDelegate: NSObject, NSURLSessionDelegate, NSURLSessionDataDelegate {
// MARK: NSURLSessionTaskDelegate
public func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError connectionError: NSError?) {
if let dataTask = task as? NSURLSessionDataTask {
dataTask.completionHandler?(dataTask.responseBuffer, dataTask.response, connectionError)
}
}
// MARK: NSURLSessionDataDelegate
public func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
dataTask.responseBuffer.appendData(data)
}
public func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didBecomeDownloadTask downloadTask: NSURLSessionDownloadTask) {
downloadTask.request = dataTask.request
}
}
// MARK: - NSURLSessionTask extensions
private var taskRequestKey = 0
private var dataTaskResponseBufferKey = 0
private var dataTaskCompletionHandlerKey = 0
private extension NSURLSessionDataTask {
// `var request: Request?` is not available in Swift 1.2
// ("protocol can only be used as a generic constraint")
private var request: Box<Any>? {
get {
return objc_getAssociatedObject(self, &taskRequestKey) as? Box<Any>
}
set {
if let value = newValue {
objc_setAssociatedObject(self, &taskRequestKey, value, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
} else {
objc_setAssociatedObject(self, &taskRequestKey, nil, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
}
}
}
private var responseBuffer: NSMutableData {
if let responseBuffer = objc_getAssociatedObject(self, &dataTaskResponseBufferKey) as? NSMutableData {
return responseBuffer
} else {
let responseBuffer = NSMutableData()
objc_setAssociatedObject(self, &dataTaskResponseBufferKey, responseBuffer, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
return responseBuffer
}
}
private var completionHandler: ((NSData, NSURLResponse?, NSError?) -> Void)? {
get {
return (objc_getAssociatedObject(self, &dataTaskCompletionHandlerKey) as? Box<(NSData, NSURLResponse?, NSError?) -> Void>)?.value
}
set {
if let value = newValue {
objc_setAssociatedObject(self, &dataTaskCompletionHandlerKey, Box(value), UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
} else {
objc_setAssociatedObject(self, &dataTaskCompletionHandlerKey, nil, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
}
}
}
}
extension NSURLSessionDownloadTask {
private var request: Box<Any>? {
get {
return objc_getAssociatedObject(self, &taskRequestKey) as? Box<Any>
}
set {
if let value = newValue {
objc_setAssociatedObject(self, &taskRequestKey, value, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
} else {
objc_setAssociatedObject(self, &taskRequestKey, nil, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
}
}
}
}