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244 lines
10 KiB
Swift
244 lines
10 KiB
Swift
// Copyright © 2023 Rangeproof Pty Ltd. All rights reserved.
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import Foundation
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import Combine
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import SessionUtilitiesKit
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// MARK: - ErasedPreparedSendData
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public protocol ErasedPreparedSendData {
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var endpoint: OpenGroupAPI.Endpoint { get }
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var batchResponseTypes: [Decodable.Type] { get }
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func encodeForBatchRequest(to encoder: Encoder) throws
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}
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// MARK: - PreparedSendData<R>
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public extension OpenGroupAPI {
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struct PreparedSendData<R>: ErasedPreparedSendData {
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internal let request: URLRequest
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internal let server: String
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internal let publicKey: String
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internal let originalType: Decodable.Type
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internal let responseType: R.Type
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internal let timeout: TimeInterval
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fileprivate let responseConverter: ((ResponseInfoType, Any) throws -> R)
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// The following types are needed for `BatchRequest` handling
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private let method: HTTPMethod
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private let path: String
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public let endpoint: Endpoint
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internal let batchEndpoints: [Endpoint]
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public let batchResponseTypes: [Decodable.Type]
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/// The `jsonBodyEncoder` is used to simplify the encoding for `BatchRequest`
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private let jsonBodyEncoder: ((inout KeyedEncodingContainer<BatchRequest.Child.CodingKeys>, BatchRequest.Child.CodingKeys) throws -> ())?
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private let b64: String?
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private let bytes: [UInt8]?
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internal init<T: Encodable>(
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request: Request<T, Endpoint>,
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urlRequest: URLRequest,
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publicKey: String,
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responseType: R.Type,
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timeout: TimeInterval
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) where R: Decodable {
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self.request = urlRequest
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self.server = request.server
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self.publicKey = publicKey
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self.originalType = responseType
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self.responseType = responseType
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self.timeout = timeout
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self.responseConverter = { _, response in
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guard let validResponse: R = response as? R else { throw HTTPError.invalidResponse }
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return validResponse
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}
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// The following data is needed in this type for handling batch requests
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self.method = request.method
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self.endpoint = request.endpoint
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self.path = request.urlPathAndParamsString
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self.batchEndpoints = ((request.body as? BatchRequest)?
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.requests
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.map { $0.request.endpoint })
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.defaulting(to: [])
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self.batchResponseTypes = ((request.body as? BatchRequest)?
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.requests
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.flatMap { $0.request.batchResponseTypes })
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.defaulting(to: [HTTP.BatchSubResponse<R>.self])
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// Note: Need to differentiate between JSON, b64 string and bytes body values to ensure
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// they are encoded correctly so the server knows how to handle them
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switch request.body {
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case let bodyString as String:
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self.jsonBodyEncoder = nil
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self.b64 = bodyString
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self.bytes = nil
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case let bodyBytes as [UInt8]:
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self.jsonBodyEncoder = nil
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self.b64 = nil
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self.bytes = bodyBytes
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default:
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self.jsonBodyEncoder = { [body = request.body] container, key in
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try container.encodeIfPresent(body, forKey: key)
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}
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self.b64 = nil
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self.bytes = nil
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}
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}
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private init<U: Decodable>(
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request: URLRequest,
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server: String,
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publicKey: String,
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originalType: U.Type,
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responseType: R.Type,
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timeout: TimeInterval,
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responseConverter: @escaping (ResponseInfoType, Any) throws -> R,
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method: HTTPMethod,
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endpoint: Endpoint,
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path: String,
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batchEndpoints: [Endpoint],
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batchResponseTypes: [Decodable.Type],
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jsonBodyEncoder: ((inout KeyedEncodingContainer<BatchRequest.Child.CodingKeys>, BatchRequest.Child.CodingKeys) throws -> ())?,
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b64: String?,
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bytes: [UInt8]?
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) {
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self.request = request
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self.server = server
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self.publicKey = publicKey
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self.originalType = originalType
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self.responseType = responseType
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self.timeout = timeout
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self.responseConverter = responseConverter
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// The following data is needed in this type for handling batch requests
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self.method = method
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self.endpoint = endpoint
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self.path = path
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self.batchEndpoints = batchEndpoints
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self.batchResponseTypes = batchResponseTypes
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self.jsonBodyEncoder = jsonBodyEncoder
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self.b64 = b64
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self.bytes = bytes
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}
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// MARK: - ErasedPreparedSendData
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public func encodeForBatchRequest(to encoder: Encoder) throws {
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var container: KeyedEncodingContainer<BatchRequest.Child.CodingKeys> = encoder.container(keyedBy: BatchRequest.Child.CodingKeys.self)
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// Exclude request signature headers (not used for sub-requests)
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let batchRequestHeaders: [String: String] = (request.allHTTPHeaderFields ?? [:])
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.filter { key, _ in
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key.lowercased() != HTTPHeader.sogsPubKey.lowercased() &&
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key.lowercased() != HTTPHeader.sogsTimestamp.lowercased() &&
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key.lowercased() != HTTPHeader.sogsNonce.lowercased() &&
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key.lowercased() != HTTPHeader.sogsSignature.lowercased()
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}
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if !batchRequestHeaders.isEmpty {
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try container.encode(batchRequestHeaders, forKey: .headers)
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}
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try container.encode(method, forKey: .method)
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try container.encode(path, forKey: .path)
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try jsonBodyEncoder?(&container, .json)
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try container.encodeIfPresent(b64, forKey: .b64)
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try container.encodeIfPresent(bytes, forKey: .bytes)
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}
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}
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}
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public extension OpenGroupAPI.PreparedSendData {
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func map<O>(transform: @escaping (ResponseInfoType, R) throws -> O) -> OpenGroupAPI.PreparedSendData<O> {
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return OpenGroupAPI.PreparedSendData(
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request: request,
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server: server,
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publicKey: publicKey,
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originalType: originalType,
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responseType: O.self,
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timeout: timeout,
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responseConverter: { info, response in
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let validResponse: R = try responseConverter(info, response)
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return try transform(info, validResponse)
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},
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method: method,
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endpoint: endpoint,
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path: path,
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batchEndpoints: batchEndpoints,
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batchResponseTypes: batchResponseTypes,
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jsonBodyEncoder: jsonBodyEncoder,
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b64: b64,
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bytes: bytes
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)
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}
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}
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// MARK: - Convenience
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public extension Publisher where Output == (ResponseInfoType, Data?), Failure == Error {
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func decoded<R>(
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with preparedData: OpenGroupAPI.PreparedSendData<R>,
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using dependencies: Dependencies
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) -> AnyPublisher<(ResponseInfoType, R), Error> {
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self
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.tryMap { responseInfo, maybeData -> (ResponseInfoType, R) in
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// Depending on the 'originalType' we need to process the response differently
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let targetData: Any = try {
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switch preparedData.originalType {
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case is OpenGroupAPI.BatchResponse.Type:
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let responses: [Decodable] = try HTTP.BatchResponse.decodingResponses(
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from: maybeData,
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as: preparedData.batchResponseTypes,
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requireAllResults: true,
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using: dependencies
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)
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return OpenGroupAPI.BatchResponse(
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info: responseInfo,
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data: Swift.zip(preparedData.batchEndpoints, responses)
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.reduce(into: [:]) { result, next in
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result[next.0] = next.1
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}
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)
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case is NoResponse.Type: return NoResponse()
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case is Optional<Data>.Type: return maybeData as Any
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case is Data.Type: return try maybeData ?? { throw HTTPError.parsingFailed }()
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case is _OptionalProtocol.Type:
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guard let data: Data = maybeData else { return maybeData as Any }
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return try preparedData.originalType.decoded(from: data, using: dependencies)
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default:
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guard let data: Data = maybeData else { throw HTTPError.parsingFailed }
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return try preparedData.originalType.decoded(from: data, using: dependencies)
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}
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}()
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// Generate and return the converted data
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let convertedData: R = try preparedData.responseConverter(responseInfo, targetData)
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return (responseInfo, convertedData)
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}
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.eraseToAnyPublisher()
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}
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}
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// MARK: - _OptionalProtocol
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/// This protocol should only be used within this file and is used to distinguish between `Any.Type` and `Optional<Any>.Type` as
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/// it seems that `is Optional<Any>.Type` doesn't work nicely but this protocol works nicely as long as the case is under any explicit
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/// `Optional<T>` handling that we need
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private protocol _OptionalProtocol {}
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extension Optional: _OptionalProtocol {}
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