Request code WIP

Package.swift

@@ -5,11 +5,13 @@ import PackageDescription
 
 let package = Package(
     name: "SwiftDevRant",
+    platforms: [.iOS(.v13), .macOS(.v10_15), .tvOS(.v13), .watchOS(.v6), .driverKit(.v19), .macCatalyst(.v13), .visionOS(.v1)],
     products: [
         // Products define the executables and libraries a package produces, making them visible to other packages.
         .library(
             name: "SwiftDevRant",
-            targets: ["SwiftDevRant"]),
+            targets: ["SwiftDevRant"]
+        ),
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.

Sources/SwiftDevRant/DevRantJSONCoder.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+extension JSONEncoder {
+    static let devRant: JSONEncoder = {
+        let encoder = JSONEncoder()
+        encoder.dateEncodingStrategy = .iso8601
+        encoder.keyEncodingStrategy = .convertToSnakeCase
+        return encoder
+    }()
+}
+
+extension JSONDecoder {
+    static let devRant: JSONDecoder = {
+        let decoder = JSONDecoder()
+        decoder.dateDecodingStrategy = .iso8601WithOptionalFractionalSeconds
+        decoder.keyDecodingStrategy = .convertFromSnakeCase
+        return decoder
+    }()
+}

Sources/SwiftDevRant/Request/JsonDecoder.DateDecodingStrategy+OptionalFractionalSeconds.swift

@@ -0,0 +1,38 @@
+import Foundation
+
+public extension JSONDecoder.DateDecodingStrategy {
+    nonisolated(unsafe) private static let dateFormatter: ISO8601DateFormatter = {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime]
+        return formatter
+    }()
+    
+    nonisolated(unsafe) private static let dateFormatterWithFractionalSeconds: ISO8601DateFormatter = {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
+        return formatter
+    }()
+    
+    static let iso8601WithOptionalFractionalSeconds: Self = {
+        return .custom { (decoder) -> Date in
+            let container = try decoder.singleValueContainer()
+            let dateString = try container.decode(String.self)
+            
+            // Workaround to work with both, fractional seconds and whole seconds.
+            
+            // Try whole seconds first:
+            
+            if let date = dateFormatter.date(from: dateString) {
+                return date
+            }
+            
+            // If it fails, try fractional:
+            
+            if let date = dateFormatterWithFractionalSeconds.date(from: dateString) {
+                return date
+            }
+            
+            throw DecodingError.dataCorruptedError(in: container, debugDescription: "Could not decode date from \(dateString).")
+        }
+    }()
+}

Sources/SwiftDevRant/Request/Logger.swift

@@ -0,0 +1,3 @@
+public protocol Logger {
+    func log(_ message: String)
+}

Sources/SwiftDevRant/Request/Request.swift

@@ -4,20 +4,22 @@ public struct Request {
     public enum Error<ApiError: Decodable & Sendable>: Swift.Error, CustomStringConvertible {
         case notHttpResponse
         case notFound
+        case noInternet
         case apiError(_ error: ApiError)
         case generalError
         
         public var description: String {
             switch self {
-            case .notHttpResponse: "response is not HTTP"
+            case .notHttpResponse: "Response is not HTTP"
             case .notFound: "Not found"
+            case .noInternet: "No internet connection"
             case .apiError(error: let error): "\(error)"
             case .generalError: "General error"
             }
         }
     }
     
-    struct EmptyError: Decodable {
+    public struct EmptyError: Decodable {
         
     }
     
@@ -37,9 +39,19 @@ public struct Request {
         var headers: [String: String] = [:]
     }
     
-    var session = URLSession(configuration: .ephemeral)
+    let encoder: JSONEncoder
+    let decoder: JSONDecoder
+    let session: URLSession
+    let logger: Logger?
     
-    func makeURLRequest(config: Config, body: Data?) -> URLRequest {
+    public init(encoder: JSONEncoder, decoder: JSONDecoder, session: URLSession = .init(configuration: .ephemeral), logger: Logger? = nil) {
+        self.encoder = encoder
+        self.decoder = decoder
+        self.session = session
+        self.logger = logger
+    }
+    
+    private func makeURLRequest(config: Config, body: Data?) -> URLRequest {
         let urlQuery = urlEncodedQueryString(from: config.urlParameters)
         guard let url = URL(string: config.backend.baseURL + config.path + urlQuery) else {
             fatalError("Couldn't create a URL")
@@ -53,7 +65,7 @@ public struct Request {
         return urlRequest
     }
     
-    func urlEncodedQueryString(from query: [String: String]) -> String {
+    private func urlEncodedQueryString(from query: [String: String]) -> String {
         guard !query.isEmpty else { return "" }
         var components = URLComponents()
         components.queryItems = query.map { URLQueryItem(name: $0.key, value: $0.value) }
@@ -61,4 +73,85 @@ public struct Request {
         let plusCorrection = absoluteString.replacingOccurrences(of: "+", with: "%2b")
         return plusCorrection
     }
+    
+    @discardableResult private func requestData<ApiError: Decodable>(urlRequest: URLRequest, apiError: ApiError.Type = EmptyError.self) async throws(Error<ApiError>) -> (data: Data, headers: [AnyHashable: Any]) {
+        do {
+            let response = try await session.data(for: urlRequest)
+            
+            if let httpResponse = response.1 as? HTTPURLResponse {
+                let data = response.0
+                
+                if let logger {
+                    let logInputString = urlRequest.httpBody.flatMap { jsonString(data: $0, prettyPrinted: true) } ?? "(none)"
+                    let logOutputString = !data.isEmpty ? jsonString(data: data, prettyPrinted: true) ?? "-" : "(none)"
+                    logger.log("\(urlRequest.httpMethod?.uppercased() ?? "?") \(urlRequest.url?.absoluteString ?? "")\nbody: \(logInputString)\nresponse: \(logOutputString)")
+                }
+                
+                if (200..<300).contains(httpResponse.statusCode) {
+                    return (data, httpResponse.allHeaderFields)
+                } else if httpResponse.statusCode == 404 {
+                    throw Error<ApiError>.notFound
+                } else {
+                    throw Error<ApiError>.apiError(try decoder.decode(apiError, from: data))
+                }
+            } else {
+                throw Error<ApiError>.notHttpResponse
+            }
+        } catch {
+            if let error = error as? URLError, error.code == .notConnectedToInternet {
+                throw Error<ApiError>.noInternet
+            } else {
+                throw Error<ApiError>.generalError
+            }
+        }
+    }
+    
+    /// JSON Data to String converter for printing/logging purposes
+    private func jsonString(data: Data, prettyPrinted: Bool) -> String? {
+        do {
+            let writingOptions: JSONSerialization.WritingOptions = prettyPrinted ? [.prettyPrinted] : []
+            let decoded: Data?
+            if String(data: data, encoding: .utf8) == "null" {
+                decoded = nil
+            } else if let string = String(data: data, encoding: .utf8), string.first == "\"", string.last == "\"" {
+                decoded = data
+            } else if let encodedDict = try JSONSerialization.jsonObject(with: data, options: []) as? [String: Any] {
+                decoded = try JSONSerialization.data(withJSONObject: encodedDict, options: writingOptions)
+            } else if let encodedArray = try JSONSerialization.jsonObject(with: data, options: []) as? [Any] {
+                decoded = try JSONSerialization.data(withJSONObject: encodedArray, options: writingOptions)
+            } else {
+                decoded = nil
+            }
+            return decoded.flatMap { String(data: $0, encoding: .utf8) }
+        } catch {
+            print(error)
+            return String(data: data, encoding: .utf8)
+        }
+    }
+    
+    // MARK: public
+    
+    public func requestJson<ApiError: Decodable>(config: Config, apiError: ApiError.Type = EmptyError.self) async throws(Error<ApiError>) {
+        let urlRequest = makeURLRequest(config: config, body: nil)
+        try await requestData(urlRequest: urlRequest, apiError: apiError)
+    }
+    
+    public func requestJson<In: Encodable, ApiError: Decodable & Sendable>(config: Config, json: In, apiError: ApiError.Type = EmptyError.self) async throws {
+        let inData = try encoder.encode(json)
+        let urlRequest = makeURLRequest(config: config, body: inData)
+        try await requestData(urlRequest: urlRequest, apiError: apiError)
+    }
+    
+    public func requestJson<Out: Decodable, ApiError: Decodable & Sendable>(config: Config, apiError: ApiError.Type = EmptyError.self) async throws -> Out {
+        let urlRequest = makeURLRequest(config: config, body: nil)
+        let outData = try await requestData(urlRequest: urlRequest, apiError: apiError).data
+        return try decoder.decode(Out.self, from: outData)
+    }
+    
+    public func requestJson<In: Encodable, Out: Decodable, ApiError: Decodable & Sendable>(config: Config, json: In, apiError: ApiError.Type = EmptyError.self) async throws -> Out {
+        let inData = try encoder.encode(json)
+        let urlRequest = makeURLRequest(config: config, body: inData)
+        let outData = try await requestData(urlRequest: urlRequest, apiError: apiError).data
+        return try decoder.decode(Out.self, from: outData)
+    }
 }

Sources/SwiftDevRant/SwiftDevRant.swift

@@ -1,2 +1,3 @@
-// The Swift Programming Language
-// https://docs.swift.org/swift-book
+public struct SwiftDevRant {
+    let request = Request(encoder: .devRant, decoder: .devRant)
+}