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+// Alamofire.swift
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+//
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+// Copyright (c) 2014–2015 Alamofire Software Foundation (http://alamofire.org/)
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+//
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+// Permission is hereby granted, free of charge, to any person obtaining a copy
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+// of this software and associated documentation files (the "Software"), to deal
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+// in the Software without restriction, including without limitation the rights
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+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+// copies of the Software, and to permit persons to whom the Software is
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+// furnished to do so, subject to the following conditions:
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+//
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+// The above copyright notice and this permission notice shall be included in
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+// all copies or substantial portions of the Software.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+// THE SOFTWARE.
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+
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+import Foundation
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+
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+extension Manager {
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+ private enum Downloadable {
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+ case Request(NSURLRequest)
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+ case ResumeData(NSData)
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+ }
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+
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+ private func download(downloadable: Downloadable, destination: Request.DownloadFileDestination) -> Request {
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+ var downloadTask: NSURLSessionDownloadTask!
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+
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+ switch downloadable {
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+ case .Request(let request):
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+ dispatch_sync(queue) {
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+ downloadTask = self.session.downloadTaskWithRequest(request)
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+ }
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+ case .ResumeData(let resumeData):
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+ dispatch_sync(queue) {
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+ downloadTask = self.session.downloadTaskWithResumeData(resumeData)
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+ }
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+ }
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+
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+ let request = Request(session: session, task: downloadTask)
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+ if let downloadDelegate = request.delegate as? Request.DownloadTaskDelegate {
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+ downloadDelegate.downloadTaskDidFinishDownloadingToURL = { (session, downloadTask, URL) in
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+ return destination(URL, downloadTask.response as! NSHTTPURLResponse)
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+ }
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+ }
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+ delegate[request.delegate.task] = request.delegate
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+
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+ if startRequestsImmediately {
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+ request.resume()
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+ }
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+
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+ return request
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+ }
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+
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+ // MARK: Request
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+
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+ /**
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+ Creates a download request using the shared manager instance for the specified method and URL string.
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+
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+ :param: method The HTTP method.
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+ :param: URLString The URL string.
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+ :param: destination The closure used to determine the destination of the downloaded file.
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+
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+ :returns: The created download request.
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+ */
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+ public func download(method: Method, _ URLString: URLStringConvertible, destination: Request.DownloadFileDestination) -> Request {
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+ return download(URLRequest(method, URLString), destination: destination)
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+ }
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+
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+ /**
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+ Creates a request for downloading from the specified URL request.
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+
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+ If `startRequestsImmediately` is `true`, the request will have `resume()` called before being returned.
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+
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+ :param: URLRequest The URL request
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+ :param: destination The closure used to determine the destination of the downloaded file.
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+
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+ :returns: The created download request.
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+ */
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+ public func download(URLRequest: URLRequestConvertible, destination: Request.DownloadFileDestination) -> Request {
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+ return download(.Request(URLRequest.URLRequest), destination: destination)
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+ }
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+
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+ // MARK: Resume Data
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+
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+ /**
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+ Creates a request for downloading from the resume data produced from a previous request cancellation.
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+
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+ If `startRequestsImmediately` is `true`, the request will have `resume()` called before being returned.
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+
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+ :param: resumeData The resume data. This is an opaque data blob produced by `NSURLSessionDownloadTask` when a task is cancelled. See `NSURLSession -downloadTaskWithResumeData:` for additional information.
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+ :param: destination The closure used to determine the destination of the downloaded file.
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+
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+ :returns: The created download request.
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+ */
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+ public func download(resumeData: NSData, destination: Request.DownloadFileDestination) -> Request {
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+ return download(.ResumeData(resumeData), destination: destination)
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+ }
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+}
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+
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+extension Request {
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+ /**
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+ A closure executed once a request has successfully completed in order to determine where to move the temporary file written to during the download process. The closure takes two arguments: the temporary file URL and the URL response, and returns a single argument: the file URL where the temporary file should be moved.
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+ */
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+ public typealias DownloadFileDestination = (NSURL, NSHTTPURLResponse) -> (NSURL)
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+
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+ /**
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+ Creates a download file destination closure which uses the default file manager to move the temporary file to a file URL in the first available directory with the specified search path directory and search path domain mask.
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+
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+ :param: directory The search path directory. `.DocumentDirectory` by default.
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+ :param: domain The search path domain mask. `.UserDomainMask` by default.
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+
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+ :returns: A download file destination closure.
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+ */
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+ public class func suggestedDownloadDestination(directory: NSSearchPathDirectory = .DocumentDirectory, domain: NSSearchPathDomainMask = .UserDomainMask) -> DownloadFileDestination {
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+
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+ return { (temporaryURL, response) -> (NSURL) in
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+ if let directoryURL = NSFileManager.defaultManager().URLsForDirectory(directory, inDomains: domain)[0] as? NSURL {
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+ return directoryURL.URLByAppendingPathComponent(response.suggestedFilename!)
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+ }
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+
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+ return temporaryURL
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+ }
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+ }
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+
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+ class DownloadTaskDelegate: TaskDelegate, NSURLSessionDownloadDelegate {
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+ var downloadTask: NSURLSessionDownloadTask! { return task as! NSURLSessionDownloadTask }
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+ var downloadProgress: ((Int64, Int64, Int64) -> Void)?
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+
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+ var resumeData: NSData?
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+ override var data: NSData? { return resumeData }
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+
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+ var downloadTaskDidFinishDownloadingToURL: ((NSURLSession!, NSURLSessionDownloadTask!, NSURL) -> (NSURL))?
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+ var downloadTaskDidWriteData: ((NSURLSession!, NSURLSessionDownloadTask!, Int64, Int64, Int64) -> Void)?
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+ var downloadTaskDidResumeAtOffset: ((NSURLSession!, NSURLSessionDownloadTask!, Int64, Int64) -> Void)?
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+
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+ // MARK: NSURLSessionDownloadDelegate
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+
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+ func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL) {
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+ if downloadTaskDidFinishDownloadingToURL != nil {
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+ let destination = downloadTaskDidFinishDownloadingToURL!(session, downloadTask, location)
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+ var fileManagerError: NSError?
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+
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+ NSFileManager.defaultManager().moveItemAtURL(location, toURL: destination, error: &fileManagerError)
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+ if fileManagerError != nil {
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+ error = fileManagerError
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+ }
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+ }
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+ }
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+
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+ func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
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+ progress.totalUnitCount = totalBytesExpectedToWrite
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+ progress.completedUnitCount = totalBytesWritten
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+
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+ downloadTaskDidWriteData?(session, downloadTask, bytesWritten, totalBytesWritten, totalBytesExpectedToWrite)
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+
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+ downloadProgress?(bytesWritten, totalBytesWritten, totalBytesExpectedToWrite)
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+ }
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+
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+ func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didResumeAtOffset fileOffset: Int64, expectedTotalBytes: Int64) {
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+ progress.totalUnitCount = expectedTotalBytes
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+ progress.completedUnitCount = fileOffset
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+
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+ downloadTaskDidResumeAtOffset?(session, downloadTask, fileOffset, expectedTotalBytes)
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+ }
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+ }
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+}
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Christian Noon