//
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// ResponseSerialization.swift
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//
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// Copyright (c) 2014-2018 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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/// The type to which all data response serializers must conform in order to serialize a response.
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public protocol DataResponseSerializerProtocol<SerializedObject> {
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/// The type of serialized object to be created.
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associatedtype SerializedObject
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/// Serialize the response `Data` into the provided type.
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///
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/// - Parameters:
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/// - request: `URLRequest` which was used to perform the request, if any.
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/// - response: `HTTPURLResponse` received from the server, if any.
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/// - data: `Data` returned from the server, if any.
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/// - error: `Error` produced by Alamofire or the underlying `URLSession` during the request.
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///
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/// - Returns: The `SerializedObject`.
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/// - Throws: Any `Error` produced during serialization.
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func serialize(request: URLRequest?, response: HTTPURLResponse?, data: Data?, error: Error?) throws -> SerializedObject
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}
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/// The type to which all download response serializers must conform in order to serialize a response.
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public protocol DownloadResponseSerializerProtocol<SerializedObject> {
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/// The type of serialized object to be created.
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associatedtype SerializedObject
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/// Serialize the downloaded response `Data` from disk into the provided type.
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///
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/// - Parameters:
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/// - request: `URLRequest` which was used to perform the request, if any.
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/// - response: `HTTPURLResponse` received from the server, if any.
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/// - fileURL: File `URL` to which the response data was downloaded.
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/// - error: `Error` produced by Alamofire or the underlying `URLSession` during the request.
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///
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/// - Returns: The `SerializedObject`.
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/// - Throws: Any `Error` produced during serialization.
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func serializeDownload(request: URLRequest?, response: HTTPURLResponse?, fileURL: URL?, error: Error?) throws -> SerializedObject
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}
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/// A serializer that can handle both data and download responses.
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public protocol ResponseSerializer<SerializedObject>: DataResponseSerializerProtocol & DownloadResponseSerializerProtocol {
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/// `DataPreprocessor` used to prepare incoming `Data` for serialization.
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var dataPreprocessor: DataPreprocessor { get }
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/// `HTTPMethod`s for which empty response bodies are considered appropriate.
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var emptyRequestMethods: Set<HTTPMethod> { get }
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/// HTTP response codes for which empty response bodies are considered appropriate.
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var emptyResponseCodes: Set<Int> { get }
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}
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/// Type used to preprocess `Data` before it handled by a serializer.
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public protocol DataPreprocessor {
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/// Process `Data` before it's handled by a serializer.
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/// - Parameter data: The raw `Data` to process.
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func preprocess(_ data: Data) throws -> Data
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}
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/// `DataPreprocessor` that returns passed `Data` without any transform.
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public struct PassthroughPreprocessor: DataPreprocessor {
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/// Creates an instance.
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public init() {}
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public func preprocess(_ data: Data) throws -> Data { data }
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}
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/// `DataPreprocessor` that trims Google's typical `)]}',\n` XSSI JSON header.
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public struct GoogleXSSIPreprocessor: DataPreprocessor {
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/// Creates an instance.
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public init() {}
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public func preprocess(_ data: Data) throws -> Data {
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(data.prefix(6) == Data(")]}',\n".utf8)) ? data.dropFirst(6) : data
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}
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}
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extension DataPreprocessor where Self == PassthroughPreprocessor {
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/// Provides a `PassthroughPreprocessor` instance.
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public static var passthrough: PassthroughPreprocessor { PassthroughPreprocessor() }
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}
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extension DataPreprocessor where Self == GoogleXSSIPreprocessor {
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/// Provides a `GoogleXSSIPreprocessor` instance.
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public static var googleXSSI: GoogleXSSIPreprocessor { GoogleXSSIPreprocessor() }
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}
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extension ResponseSerializer {
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/// Default `DataPreprocessor`. `PassthroughPreprocessor` by default.
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public static var defaultDataPreprocessor: DataPreprocessor { PassthroughPreprocessor() }
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/// Default `HTTPMethod`s for which empty response bodies are always considered appropriate. `[.head]` by default.
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public static var defaultEmptyRequestMethods: Set<HTTPMethod> { [.head] }
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/// HTTP response codes for which empty response bodies are always considered appropriate. `[204, 205]` by default.
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public static var defaultEmptyResponseCodes: Set<Int> { [204, 205] }
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public var dataPreprocessor: DataPreprocessor { Self.defaultDataPreprocessor }
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public var emptyRequestMethods: Set<HTTPMethod> { Self.defaultEmptyRequestMethods }
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public var emptyResponseCodes: Set<Int> { Self.defaultEmptyResponseCodes }
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/// Determines whether the `request` allows empty response bodies, if `request` exists.
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///
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/// - Parameter request: `URLRequest` to evaluate.
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///
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/// - Returns: `Bool` representing the outcome of the evaluation, or `nil` if `request` was `nil`.
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public func requestAllowsEmptyResponseData(_ request: URLRequest?) -> Bool? {
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request.flatMap(\.httpMethod)
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.flatMap(HTTPMethod.init)
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.map { emptyRequestMethods.contains($0) }
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}
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/// Determines whether the `response` allows empty response bodies, if `response` exists.
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///
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/// - Parameter response: `HTTPURLResponse` to evaluate.
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///
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/// - Returns: `Bool` representing the outcome of the evaluation, or `nil` if `response` was `nil`.
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public func responseAllowsEmptyResponseData(_ response: HTTPURLResponse?) -> Bool? {
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response.map(\.statusCode)
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.map { emptyResponseCodes.contains($0) }
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}
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/// Determines whether `request` and `response` allow empty response bodies.
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///
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/// - Parameters:
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/// - request: `URLRequest` to evaluate.
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/// - response: `HTTPURLResponse` to evaluate.
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///
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/// - Returns: `true` if `request` or `response` allow empty bodies, `false` otherwise.
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public func emptyResponseAllowed(forRequest request: URLRequest?, response: HTTPURLResponse?) -> Bool {
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(requestAllowsEmptyResponseData(request) == true) || (responseAllowsEmptyResponseData(response) == true)
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}
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}
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/// By default, any serializer declared to conform to both types will get file serialization for free, as it just feeds
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/// the data read from disk into the data response serializer.
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extension DownloadResponseSerializerProtocol where Self: DataResponseSerializerProtocol {
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public func serializeDownload(request: URLRequest?, response: HTTPURLResponse?, fileURL: URL?, error: Error?) throws -> Self.SerializedObject {
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guard error == nil else { throw error! }
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guard let fileURL else {
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throw AFError.responseSerializationFailed(reason: .inputFileNil)
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}
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let data: Data
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do {
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data = try Data(contentsOf: fileURL)
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} catch {
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throw AFError.responseSerializationFailed(reason: .inputFileReadFailed(at: fileURL))
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}
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do {
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return try serialize(request: request, response: response, data: data, error: error)
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} catch {
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throw error
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}
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}
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}
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// MARK: - URL
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/// A `DownloadResponseSerializerProtocol` that performs only `Error` checking and ensures that a downloaded `fileURL`
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/// is present.
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public struct URLResponseSerializer: DownloadResponseSerializerProtocol {
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/// Creates an instance.
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public init() {}
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public func serializeDownload(request: URLRequest?,
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response: HTTPURLResponse?,
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fileURL: URL?,
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error: Error?) throws -> URL {
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guard error == nil else { throw error! }
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guard let url = fileURL else {
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throw AFError.responseSerializationFailed(reason: .inputFileNil)
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}
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return url
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}
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}
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extension DownloadResponseSerializerProtocol where Self == URLResponseSerializer {
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/// Provides a `URLResponseSerializer` instance.
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public static var url: URLResponseSerializer { URLResponseSerializer() }
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}
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// MARK: - Data
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/// A `ResponseSerializer` that performs minimal response checking and returns any response `Data` as-is. By default, a
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/// request returning `nil` or no data is considered an error. However, if the request has an `HTTPMethod` or the
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/// response has an HTTP status code valid for empty responses, then an empty `Data` value is returned.
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public final class DataResponseSerializer: ResponseSerializer {
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public let dataPreprocessor: DataPreprocessor
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public let emptyResponseCodes: Set<Int>
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public let emptyRequestMethods: Set<HTTPMethod>
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/// Creates a `DataResponseSerializer` using the provided parameters.
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///
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/// - Parameters:
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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public init(dataPreprocessor: DataPreprocessor = DataResponseSerializer.defaultDataPreprocessor,
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emptyResponseCodes: Set<Int> = DataResponseSerializer.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = DataResponseSerializer.defaultEmptyRequestMethods) {
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self.dataPreprocessor = dataPreprocessor
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self.emptyResponseCodes = emptyResponseCodes
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self.emptyRequestMethods = emptyRequestMethods
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}
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public func serialize(request: URLRequest?, response: HTTPURLResponse?, data: Data?, error: Error?) throws -> Data {
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guard error == nil else { throw error! }
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guard var data, !data.isEmpty else {
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guard emptyResponseAllowed(forRequest: request, response: response) else {
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throw AFError.responseSerializationFailed(reason: .inputDataNilOrZeroLength)
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}
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return Data()
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}
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data = try dataPreprocessor.preprocess(data)
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return data
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}
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}
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extension ResponseSerializer where Self == DataResponseSerializer {
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/// Provides a default `DataResponseSerializer` instance.
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public static var data: DataResponseSerializer { DataResponseSerializer() }
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/// Creates a `DataResponseSerializer` using the provided parameters.
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///
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/// - Parameters:
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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///
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/// - Returns: The `DataResponseSerializer`.
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public static func data(dataPreprocessor: DataPreprocessor = DataResponseSerializer.defaultDataPreprocessor,
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emptyResponseCodes: Set<Int> = DataResponseSerializer.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = DataResponseSerializer.defaultEmptyRequestMethods) -> DataResponseSerializer {
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DataResponseSerializer(dataPreprocessor: dataPreprocessor,
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emptyResponseCodes: emptyResponseCodes,
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emptyRequestMethods: emptyRequestMethods)
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}
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}
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// MARK: - String
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/// A `ResponseSerializer` that decodes the response data as a `String`. By default, a request returning `nil` or no
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/// data is considered an error. However, if the request has an `HTTPMethod` or the response has an HTTP status code
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/// valid for empty responses, then an empty `String` is returned.
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public final class StringResponseSerializer: ResponseSerializer {
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public let dataPreprocessor: DataPreprocessor
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/// Optional string encoding used to validate the response.
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public let encoding: String.Encoding?
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public let emptyResponseCodes: Set<Int>
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public let emptyRequestMethods: Set<HTTPMethod>
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/// Creates an instance with the provided values.
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///
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/// - Parameters:
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - encoding: A string encoding. Defaults to `nil`, in which case the encoding will be determined
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/// from the server response, falling back to the default HTTP character set, `ISO-8859-1`.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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public init(dataPreprocessor: DataPreprocessor = StringResponseSerializer.defaultDataPreprocessor,
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encoding: String.Encoding? = nil,
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emptyResponseCodes: Set<Int> = StringResponseSerializer.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = StringResponseSerializer.defaultEmptyRequestMethods) {
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self.dataPreprocessor = dataPreprocessor
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self.encoding = encoding
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self.emptyResponseCodes = emptyResponseCodes
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self.emptyRequestMethods = emptyRequestMethods
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}
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public func serialize(request: URLRequest?, response: HTTPURLResponse?, data: Data?, error: Error?) throws -> String {
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guard error == nil else { throw error! }
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guard var data, !data.isEmpty else {
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guard emptyResponseAllowed(forRequest: request, response: response) else {
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throw AFError.responseSerializationFailed(reason: .inputDataNilOrZeroLength)
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}
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return ""
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}
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data = try dataPreprocessor.preprocess(data)
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var convertedEncoding = encoding
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if let encodingName = response?.textEncodingName, convertedEncoding == nil {
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convertedEncoding = String.Encoding(ianaCharsetName: encodingName)
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}
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let actualEncoding = convertedEncoding ?? .isoLatin1
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guard let string = String(data: data, encoding: actualEncoding) else {
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throw AFError.responseSerializationFailed(reason: .stringSerializationFailed(encoding: actualEncoding))
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}
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return string
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}
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}
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extension ResponseSerializer where Self == StringResponseSerializer {
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/// Provides a default `StringResponseSerializer` instance.
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public static var string: StringResponseSerializer { StringResponseSerializer() }
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/// Creates a `StringResponseSerializer` with the provided values.
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///
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/// - Parameters:
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - encoding: A string encoding. Defaults to `nil`, in which case the encoding will be determined
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/// from the server response, falling back to the default HTTP character set, `ISO-8859-1`.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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///
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/// - Returns: The `StringResponseSerializer`.
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public static func string(dataPreprocessor: DataPreprocessor = StringResponseSerializer.defaultDataPreprocessor,
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encoding: String.Encoding? = nil,
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emptyResponseCodes: Set<Int> = StringResponseSerializer.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = StringResponseSerializer.defaultEmptyRequestMethods) -> StringResponseSerializer {
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StringResponseSerializer(dataPreprocessor: dataPreprocessor,
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encoding: encoding,
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emptyResponseCodes: emptyResponseCodes,
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emptyRequestMethods: emptyRequestMethods)
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}
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}
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// MARK: - JSON
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/// A `ResponseSerializer` that decodes the response data using `JSONSerialization`. By default, a request returning
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/// `nil` or no data is considered an error. However, if the request has an `HTTPMethod` or the response has an
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/// HTTP status code valid for empty responses, then an `NSNull` value is returned.
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///
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/// - Note: This serializer is deprecated and should not be used. Instead, create concrete types conforming to
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/// `Decodable` and use a `DecodableResponseSerializer`.
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@available(*, deprecated, message: "JSONResponseSerializer deprecated and will be removed in Alamofire 6. Use DecodableResponseSerializer instead.")
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public final class JSONResponseSerializer: ResponseSerializer {
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public let dataPreprocessor: DataPreprocessor
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public let emptyResponseCodes: Set<Int>
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public let emptyRequestMethods: Set<HTTPMethod>
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/// `JSONSerialization.ReadingOptions` used when serializing a response.
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public let options: JSONSerialization.ReadingOptions
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/// Creates an instance with the provided values.
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///
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/// - Parameters:
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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/// - options: The options to use. `.allowFragments` by default.
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public init(dataPreprocessor: DataPreprocessor = JSONResponseSerializer.defaultDataPreprocessor,
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emptyResponseCodes: Set<Int> = JSONResponseSerializer.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = JSONResponseSerializer.defaultEmptyRequestMethods,
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options: JSONSerialization.ReadingOptions = .allowFragments) {
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self.dataPreprocessor = dataPreprocessor
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self.emptyResponseCodes = emptyResponseCodes
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self.emptyRequestMethods = emptyRequestMethods
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self.options = options
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}
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public func serialize(request: URLRequest?, response: HTTPURLResponse?, data: Data?, error: Error?) throws -> Any {
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guard error == nil else { throw error! }
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guard var data, !data.isEmpty else {
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guard emptyResponseAllowed(forRequest: request, response: response) else {
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throw AFError.responseSerializationFailed(reason: .inputDataNilOrZeroLength)
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}
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return NSNull()
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}
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data = try dataPreprocessor.preprocess(data)
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do {
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return try JSONSerialization.jsonObject(with: data, options: options)
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} catch {
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throw AFError.responseSerializationFailed(reason: .jsonSerializationFailed(error: error))
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}
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}
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}
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// MARK: - Empty
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/// Protocol representing an empty response. Use `T.emptyValue()` to get an instance.
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public protocol EmptyResponse {
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/// Empty value for the conforming type.
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///
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/// - Returns: Value of `Self` to use for empty values.
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static func emptyValue() -> Self
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}
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/// Type representing an empty value. Use `Empty.value` to get the static instance.
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public struct Empty: Codable, Sendable {
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/// Static `Empty` instance used for all `Empty` responses.
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public static let value = Empty()
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}
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extension Empty: EmptyResponse {
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public static func emptyValue() -> Empty {
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value
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}
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}
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// MARK: - DataDecoder Protocol
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/// Any type which can decode `Data` into a `Decodable` type.
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public protocol DataDecoder {
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/// Decode `Data` into the provided type.
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///
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/// - Parameters:
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/// - type: The `Type` to be decoded.
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/// - data: The `Data` to be decoded.
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///
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/// - Returns: The decoded value of type `D`.
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/// - Throws: Any error that occurs during decode.
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func decode<D: Decodable>(_ type: D.Type, from data: Data) throws -> D
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}
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/// `JSONDecoder` automatically conforms to `DataDecoder`.
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extension JSONDecoder: DataDecoder {}
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/// `PropertyListDecoder` automatically conforms to `DataDecoder`.
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extension PropertyListDecoder: DataDecoder {}
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// MARK: - Decodable
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/// A `ResponseSerializer` that decodes the response data as a generic value using any type that conforms to
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/// `DataDecoder`. By default, this is an instance of `JSONDecoder`. Additionally, a request returning `nil` or no data
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/// is considered an error. However, if the request has an `HTTPMethod` or the response has an HTTP status code valid
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/// for empty responses then an empty value will be returned. If the decoded type conforms to `EmptyResponse`, the
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/// type's `emptyValue()` will be returned. If the decoded type is `Empty`, the `.value` instance is returned. If the
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/// decoded type *does not* conform to `EmptyResponse` and isn't `Empty`, an error will be produced.
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public final class DecodableResponseSerializer<T: Decodable>: ResponseSerializer {
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public let dataPreprocessor: DataPreprocessor
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/// The `DataDecoder` instance used to decode responses.
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public let decoder: DataDecoder
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public let emptyResponseCodes: Set<Int>
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public let emptyRequestMethods: Set<HTTPMethod>
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/// Creates an instance using the values provided.
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///
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/// - Parameters:
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - decoder: The `DataDecoder`. `JSONDecoder()` by default.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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public init(dataPreprocessor: DataPreprocessor = DecodableResponseSerializer.defaultDataPreprocessor,
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decoder: DataDecoder = JSONDecoder(),
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emptyResponseCodes: Set<Int> = DecodableResponseSerializer.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = DecodableResponseSerializer.defaultEmptyRequestMethods) {
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self.dataPreprocessor = dataPreprocessor
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self.decoder = decoder
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self.emptyResponseCodes = emptyResponseCodes
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self.emptyRequestMethods = emptyRequestMethods
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}
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public func serialize(request: URLRequest?, response: HTTPURLResponse?, data: Data?, error: Error?) throws -> T {
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guard error == nil else { throw error! }
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guard var data, !data.isEmpty else {
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guard emptyResponseAllowed(forRequest: request, response: response) else {
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throw AFError.responseSerializationFailed(reason: .inputDataNilOrZeroLength)
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}
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guard let emptyResponseType = T.self as? EmptyResponse.Type, let emptyValue = emptyResponseType.emptyValue() as? T else {
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throw AFError.responseSerializationFailed(reason: .invalidEmptyResponse(type: "\(T.self)"))
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}
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return emptyValue
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}
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data = try dataPreprocessor.preprocess(data)
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do {
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return try decoder.decode(T.self, from: data)
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} catch {
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throw AFError.responseSerializationFailed(reason: .decodingFailed(error: error))
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}
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}
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}
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extension ResponseSerializer {
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/// Creates a `DecodableResponseSerializer` using the values provided.
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///
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/// - Parameters:
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/// - type: `Decodable` type to decode from response data.
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/// - dataPreprocessor: `DataPreprocessor` used to prepare the received `Data` for serialization.
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/// - decoder: The `DataDecoder`. `JSONDecoder()` by default.
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/// - emptyResponseCodes: The HTTP response codes for which empty responses are allowed. `[204, 205]` by default.
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/// - emptyRequestMethods: The HTTP request methods for which empty responses are allowed. `[.head]` by default.
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///
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/// - Returns: The `DecodableResponseSerializer`.
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public static func decodable<T: Decodable>(of type: T.Type,
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dataPreprocessor: DataPreprocessor = DecodableResponseSerializer<T>.defaultDataPreprocessor,
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decoder: DataDecoder = JSONDecoder(),
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emptyResponseCodes: Set<Int> = DecodableResponseSerializer<T>.defaultEmptyResponseCodes,
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emptyRequestMethods: Set<HTTPMethod> = DecodableResponseSerializer<T>.defaultEmptyRequestMethods) -> DecodableResponseSerializer<T> where Self == DecodableResponseSerializer<T> {
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DecodableResponseSerializer<T>(dataPreprocessor: dataPreprocessor,
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decoder: decoder,
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emptyResponseCodes: emptyResponseCodes,
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emptyRequestMethods: emptyRequestMethods)
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}
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}
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