126 lines
4.8 KiB
Swift
126 lines
4.8 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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public extension OpenGroupAPI {
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struct PreparedSendData<R> {
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internal let request: URLRequest
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internal let endpoint: Endpoint
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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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internal let responseConverter: ((ResponseInfoType, Any) throws -> R)
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internal init(
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request: URLRequest,
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endpoint: Endpoint,
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server: String,
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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 = request
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self.endpoint = endpoint
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self.server = 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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}
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private init<U: Decodable>(
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request: URLRequest,
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endpoint: Endpoint,
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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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) {
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self.request = request
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self.endpoint = endpoint
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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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}
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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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endpoint: endpoint,
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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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)
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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 = 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 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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