[Swift3] Download file fix

modules/swagger-codegen/src/main/resources/swift3/AlamofireImplementations.mustache

@@ -207,6 +207,56 @@ open class AlamofireRequestBuilder<T>: RequestBuilder<T> {
                     nil
                 )
             })
+        case is URL.Type:
+            validatedRequest.responseData(completionHandler: { (dataResponse) in
+                cleanupRequest()
+
+                do {
+
+                    guard !dataResponse.result.isFailure else {
+                        throw DownloadException.responseFailed
+                    }
+
+                    guard let data = dataResponse.data else {
+                        throw DownloadException.responseDataMissing
+                    }
+
+                    guard let request = request.request else {
+                        throw DownloadException.requestMissing
+                    }
+
+                    let fileManager = FileManager.default
+                    let urlRequest = try request.asURLRequest()
+                    let documentsDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
+                    let requestURL = try self.getURL(from: urlRequest)
+
+                    var requestPath = try self.getPath(from: requestURL)
+
+                    if let headerFileName = self.getFileName(fromContentDisposition: dataResponse.response?.allHeaderFields["Content-Disposition"] as? String) {
+                        requestPath = requestPath.appending("/\(headerFileName)")
+                    }
+
+                    let filePath = documentsDirectory.appendingPathComponent(requestPath)
+                    let directoryPath = filePath.deletingLastPathComponent().path
+
+                    try fileManager.createDirectory(atPath: directoryPath, withIntermediateDirectories: true, attributes: nil)
+                    try data.write(to: filePath, options: .atomic)
+
+                    completion(
+                        Response(
+                            response: dataResponse.response!,
+                            body: (filePath as! T)
+                        ),
+                        nil
+                    )
+
+                } catch let requestParserError as DownloadException {
+                    completion(nil, ErrorResponse.HttpError(statusCode: 400, data:  dataResponse.data, error: requestParserError))
+                } catch let error {
+                    completion(nil, ErrorResponse.HttpError(statusCode: 400, data: dataResponse.data, error: error))
+                }
+                return
+            })
         default:
             validatedRequest.responseJSON(options: .allowFragments) { response in
                 cleanupRequest()
@@ -253,4 +303,63 @@ open class AlamofireRequestBuilder<T>: RequestBuilder<T> {
         }
         return httpHeaders
     }
+
+    fileprivate func getFileName(fromContentDisposition contentDisposition : String?) -> String? {
+
+        guard let contentDisposition = contentDisposition else {
+            return nil
+        }
+
+        let items = contentDisposition.components(separatedBy: ";")
+
+        var filename : String? = nil
+
+        for contentItem in items {
+
+            let filenameKey = "filename="
+            guard let range = contentItem.range(of: filenameKey) else {
+                break
+            }
+
+            filename = contentItem
+            return filename?
+                .replacingCharacters(in: range, with:"")
+                .replacingOccurrences(of: "\"", with: "")
+                .trimmingCharacters(in: .whitespacesAndNewlines)
+        }
+
+        return filename
+
+    }
+
+    fileprivate func getPath(from url : URL) throws -> String {
+
+        guard var path = NSURLComponents(url: url, resolvingAgainstBaseURL: true)?.path else {
+            throw DownloadException.requestMissingPath
+        }
+
+        if path.hasPrefix("/") {
+            path.remove(at: path.startIndex)
+        }
+
+        return path
+
+    }
+
+    fileprivate func getURL(from urlRequest : URLRequest) throws -> URL {
+
+        guard let url = urlRequest.url else {
+            throw DownloadException.requestMissingURL
+        }
+
+        return url
+    }
 }
+
+fileprivate enum DownloadException : Error {
+    case responseDataMissing
+    case responseFailed
+    case requestMissing
+    case requestMissingPath
+    case requestMissingURL
+}

samples/client/petstore/swift3/default/PetstoreClient/Classes/Swaggers/AlamofireImplementations.swift

@@ -207,6 +207,56 @@ open class AlamofireRequestBuilder<T>: RequestBuilder<T> {
                     nil
                 )
             })
+        case is URL.Type:
+            validatedRequest.responseData(completionHandler: { (dataResponse) in
+                cleanupRequest()
+
+                do {
+
+                    guard !dataResponse.result.isFailure else {
+                        throw DownloadException.responseFailed
+                    }
+
+                    guard let data = dataResponse.data else {
+                        throw DownloadException.responseDataMissing
+                    }
+
+                    guard let request = request.request else {
+                        throw DownloadException.requestMissing
+                    }
+
+                    let fileManager = FileManager.default
+                    let urlRequest = try request.asURLRequest()
+                    let documentsDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
+                    let requestURL = try self.getURL(from: urlRequest)
+
+                    var requestPath = try self.getPath(from: requestURL)
+
+                    if let headerFileName = self.getFileName(fromContentDisposition: dataResponse.response?.allHeaderFields["Content-Disposition"] as? String) {
+                        requestPath = requestPath.appending("/\(headerFileName)")
+                    }
+
+                    let filePath = documentsDirectory.appendingPathComponent(requestPath)
+                    let directoryPath = filePath.deletingLastPathComponent().path
+
+                    try fileManager.createDirectory(atPath: directoryPath, withIntermediateDirectories: true, attributes: nil)
+                    try data.write(to: filePath, options: .atomic)
+
+                    completion(
+                        Response(
+                            response: dataResponse.response!,
+                            body: (filePath as! T)
+                        ),
+                        nil
+                    )
+
+                } catch let requestParserError as DownloadException {
+                    completion(nil, ErrorResponse.HttpError(statusCode: 400, data:  dataResponse.data, error: requestParserError))
+                } catch let error {
+                    completion(nil, ErrorResponse.HttpError(statusCode: 400, data: dataResponse.data, error: error))
+                }
+                return
+            })
         default:
             validatedRequest.responseJSON(options: .allowFragments) { response in
                 cleanupRequest()
@@ -253,4 +303,63 @@ open class AlamofireRequestBuilder<T>: RequestBuilder<T> {
         }
         return httpHeaders
     }
+
+    fileprivate func getFileName(fromContentDisposition contentDisposition : String?) -> String? {
+
+        guard let contentDisposition = contentDisposition else {
+            return nil
+        }
+
+        let items = contentDisposition.components(separatedBy: ";")
+
+        var filename : String? = nil
+
+        for contentItem in items {
+
+            let filenameKey = "filename="
+            guard let range = contentItem.range(of: filenameKey) else {
+                break
+            }
+
+            filename = contentItem
+            return filename?
+                .replacingCharacters(in: range, with:"")
+                .replacingOccurrences(of: "\"", with: "")
+                .trimmingCharacters(in: .whitespacesAndNewlines)
+        }
+
+        return filename
+
+    }
+
+    fileprivate func getPath(from url : URL) throws -> String {
+
+        guard var path = NSURLComponents(url: url, resolvingAgainstBaseURL: true)?.path else {
+            throw DownloadException.requestMissingPath
+        }
+
+        if path.hasPrefix("/") {
+            path.remove(at: path.startIndex)
+        }
+
+        return path
+
+    }
+
+    fileprivate func getURL(from urlRequest : URLRequest) throws -> URL {
+
+        guard let url = urlRequest.url else {
+            throw DownloadException.requestMissingURL
+        }
+
+        return url
+    }
 }
+
+fileprivate enum DownloadException : Error {
+    case responseDataMissing
+    case responseFailed
+    case requestMissing
+    case requestMissingPath
+    case requestMissingURL
+}