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Initial implementation of FTP Protocol
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| // This source file is part of the Swift.org open source project | ||
| // | ||
| // Copyright (c) 2014 - 2019 Apple Inc. and the Swift project authors | ||
| // Licensed under Apache License v2.0 with Runtime Library Exception | ||
| // | ||
| // See http://swift.org/LICENSE.txt for license information | ||
| // See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors | ||
| // | ||
|
|
||
| import CoreFoundation | ||
| import Dispatch | ||
|
|
||
| internal class _FTPURLProtocol: _NativeProtocol { | ||
|
|
||
| public required init(task: URLSessionTask, cachedResponse: CachedURLResponse?, client: URLProtocolClient?) { | ||
| super.init(task: task, cachedResponse: cachedResponse, client: client) | ||
| } | ||
|
|
||
| public required init(request: URLRequest, cachedResponse: CachedURLResponse?, client: URLProtocolClient?) { | ||
| super.init(request: request, cachedResponse: cachedResponse, client: client) | ||
| } | ||
|
|
||
| override class func canInit(with request: URLRequest) -> Bool { | ||
| // TODO: Implement sftp and ftps | ||
| guard request.url?.scheme == "ftp" | ||
| else { return false } | ||
| return true | ||
| } | ||
|
|
||
| override func didReceive(headerData data: Data, contentLength: Int64) -> _EasyHandle._Action { | ||
| guard case .transferInProgress(let ts) = internalState else { fatalError("Received body data, but no transfer in progress.") } | ||
| guard let task = task else { fatalError("Received header data but no task available.") } | ||
| task.countOfBytesExpectedToReceive = contentLength > 0 ? contentLength : NSURLSessionTransferSizeUnknown | ||
| do { | ||
| let newTS = try ts.byAppendingFTP(headerLine: data, expectedContentLength: contentLength) | ||
| internalState = .transferInProgress(newTS) | ||
| let didCompleteHeader = !ts.isHeaderComplete && newTS.isHeaderComplete | ||
| if didCompleteHeader { | ||
| // The header is now complete, but wasn't before. | ||
| didReceiveResponse() | ||
| } | ||
| return .proceed | ||
| } catch { | ||
| return .abort | ||
| } | ||
| } | ||
|
|
||
| override func configureEasyHandle(for request: URLRequest) { | ||
| easyHandle.set(verboseModeOn: enableLibcurlDebugOutput) | ||
| easyHandle.set(debugOutputOn: enableLibcurlDebugOutput, task: task!) | ||
| easyHandle.set(skipAllSignalHandling: true) | ||
| guard let url = request.url else { fatalError("No URL in request.") } | ||
| easyHandle.set(url: url) | ||
| easyHandle.set(preferredReceiveBufferSize: Int.max) | ||
| do { | ||
| switch (task?.body, try task?.body.getBodyLength()) { | ||
| case (.some(URLSessionTask._Body.none), _): | ||
| set(requestBodyLength: .noBody) | ||
| case (_, .some(let length)): | ||
| set(requestBodyLength: .length(length)) | ||
| task!.countOfBytesExpectedToSend = Int64(length) | ||
| case (_, .none): | ||
| set(requestBodyLength: .unknown) | ||
| } | ||
| } catch let e { | ||
| // Fail the request here. | ||
| // TODO: We have multiple options: | ||
| // NSURLErrorNoPermissionsToReadFile | ||
| // NSURLErrorFileDoesNotExist | ||
| self.internalState = .transferFailed | ||
| let error = NSError(domain: NSURLErrorDomain, code: errorCode(fileSystemError: e), | ||
| userInfo: [NSLocalizedDescriptionKey: "File system error"]) | ||
| failWith(error: error, request: request) | ||
| return | ||
| } | ||
| let timeoutHandler = DispatchWorkItem { [weak self] in | ||
| guard let _ = self?.task else { fatalError("Timeout on a task that doesn't exist") } //this guard must always pass | ||
| self?.internalState = .transferFailed | ||
| let urlError = URLError(_nsError: NSError(domain: NSURLErrorDomain, code: NSURLErrorTimedOut, userInfo: nil)) | ||
| self?.completeTask(withError: urlError) | ||
| self?.client?.urlProtocol(self!, didFailWithError: urlError) | ||
| } | ||
| guard let task = self.task else { fatalError() } | ||
| easyHandle.timeoutTimer = _TimeoutSource(queue: task.workQueue, milliseconds: Int(request.timeoutInterval) * 1000, handler: timeoutHandler) | ||
|
|
||
| easyHandle.set(automaticBodyDecompression: true) | ||
| } | ||
| } | ||
|
|
||
| /// Response processing | ||
| internal extension _FTPURLProtocol { | ||
| /// Whenever we receive a response (i.e. a complete header) from libcurl, | ||
| /// this method gets called. | ||
| func didReceiveResponse() { | ||
| guard let _ = task as? URLSessionDataTask else { return } | ||
| guard case .transferInProgress(let ts) = self.internalState else { fatalError("Transfer not in progress.") } | ||
| guard let response = ts.response else { fatalError("Header complete, but not URL response.") } | ||
| guard let session = task?.session as? URLSession else { fatalError() } | ||
| switch session.behaviour(for: self.task!) { | ||
| case .noDelegate: | ||
| break | ||
| case .taskDelegate: | ||
| self.client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: .notAllowed) | ||
| case .dataCompletionHandler: | ||
| break | ||
| case .downloadCompletionHandler: | ||
| break | ||
| } | ||
| } | ||
| } |
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