Logging in and displaying alerts

AutoCat2.xcodeproj/project.pbxproj

@@ -32,6 +32,9 @@
 		7A40D5FF2693A91F009B0BC4 /* CocoaError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A40D5FD2693A91F009B0BC4 /* CocoaError.swift */; };
 		7A40D6022694FF5D009B0BC4 /* Api.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A40D6012694FF5D009B0BC4 /* Api.swift */; };
 		7A40D6032694FF5D009B0BC4 /* Api.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A40D6012694FF5D009B0BC4 /* Api.swift */; };
+		7A40D60826998DCF009B0BC4 /* Alert.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A40D60726998DCF009B0BC4 /* Alert.swift */; };
+		7A40D60926998DCF009B0BC4 /* Alert.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A40D60726998DCF009B0BC4 /* Alert.swift */; };
+		7A40D60C2699A070009B0BC4 /* MockURLProtocol.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A40D60B2699A070009B0BC4 /* MockURLProtocol.swift */; };
 		7A683999269612EA00B2188A /* Response.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A683998269612EA00B2188A /* Response.swift */; };
 		7A68399A269612EA00B2188A /* Response.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7A683998269612EA00B2188A /* Response.swift */; };
 		7ACD05D72695C08A00557667 /* Constants.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7ACD05D62695C08A00557667 /* Constants.swift */; };
@@ -108,6 +111,8 @@
 		7A40D5F52693A63A009B0BC4 /* SettingsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsTests.swift; sourceTree = "<group>"; };
 		7A40D5FD2693A91F009B0BC4 /* CocoaError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CocoaError.swift; sourceTree = "<group>"; };
 		7A40D6012694FF5D009B0BC4 /* Api.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Api.swift; sourceTree = "<group>"; };
+		7A40D60726998DCF009B0BC4 /* Alert.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Alert.swift; sourceTree = "<group>"; };
+		7A40D60B2699A070009B0BC4 /* MockURLProtocol.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MockURLProtocol.swift; sourceTree = "<group>"; };
 		7A683998269612EA00B2188A /* Response.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Response.swift; sourceTree = "<group>"; };
 		7ACD05D62695C08A00557667 /* Constants.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Constants.swift; sourceTree = "<group>"; };
 		7AEFAEEC26985A3400ED2C85 /* ACProgressView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ACProgressView.swift; sourceTree = "<group>"; };
@@ -255,6 +260,7 @@
 		7A40D5F42693A63A009B0BC4 /* AutoCat2Tests */ = {
 			isa = PBXGroup;
 			children = (
+				7A40D60A2699A04F009B0BC4 /* Mocks */,
 				7A40D5F52693A63A009B0BC4 /* SettingsTests.swift */,
 				7AF552D82696E5C100578083 /* ApiTests.swift */,
 			);
@@ -265,6 +271,7 @@
 			isa = PBXGroup;
 			children = (
 				7A40D5FD2693A91F009B0BC4 /* CocoaError.swift */,
+				7A40D60726998DCF009B0BC4 /* Alert.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -278,6 +285,14 @@
 			path = Utils;
 			sourceTree = "<group>";
 		};
+		7A40D60A2699A04F009B0BC4 /* Mocks */ = {
+			isa = PBXGroup;
+			children = (
+				7A40D60B2699A070009B0BC4 /* MockURLProtocol.swift */,
+			);
+			path = Mocks;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -474,6 +489,7 @@
 				7AEFAEED26985A3400ED2C85 /* ACProgressView.swift in Sources */,
 				7A40D5A02691C6D8009B0BC4 /* AutoCat2App.swift in Sources */,
 				7A683999269612EA00B2188A /* Response.swift in Sources */,
+				7A40D60826998DCF009B0BC4 /* Alert.swift in Sources */,
 				7A40D5A42691C6D8009B0BC4 /* Persistence.swift in Sources */,
 				7A40D5ED2693A1EA009B0BC4 /* AuthVM.swift in Sources */,
 				7A40D59E2691C6D8009B0BC4 /* AutoCat2.xcdatamodeld in Sources */,
@@ -494,6 +510,7 @@
 				7AEFAEEE26985A3400ED2C85 /* ACProgressView.swift in Sources */,
 				7A40D5A52691C6D8009B0BC4 /* Persistence.swift in Sources */,
 				7A68399A269612EA00B2188A /* Response.swift in Sources */,
+				7A40D60926998DCF009B0BC4 /* Alert.swift in Sources */,
 				7A40D5E526924B0C009B0BC4 /* User.swift in Sources */,
 				7A40D5EE2693A1EA009B0BC4 /* AuthVM.swift in Sources */,
 				7A40D59F2691C6D8009B0BC4 /* AutoCat2.xcdatamodeld in Sources */,
@@ -524,6 +541,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				7A40D60C2699A070009B0BC4 /* MockURLProtocol.swift in Sources */,
 				7AF552D92696E5C100578083 /* ApiTests.swift in Sources */,
 				7A40D5F62693A63A009B0BC4 /* SettingsTests.swift in Sources */,
 			);

AutoCat2Tests/ApiTests.swift

@@ -7,6 +7,7 @@ class ApiTests: XCTestCase {
 
     override func setUpWithError() throws {
         let sessionConfig = URLSessionConfiguration.default
+        sessionConfig.protocolClasses = [MockURLProtocol.self]
         let session = URLSession(configuration: sessionConfig)
         self.api = Api(session: session)
     }
@@ -16,7 +17,7 @@ class ApiTests: XCTestCase {
     }
 
     func testLogin() async throws {
-        let user = try await self.api.login()
+        let user = try await self.api.login(email: "", password: "")
     }
 
 //    func testPerformanceExample() throws {

AutoCat2Tests/Mocks/MockURLProtocol.swift

@@ -0,0 +1,44 @@
+import Foundation
+
+class MockURLProtocol: URLProtocol {
+  
+  override class func canInit(with request: URLRequest) -> Bool {
+      // To check if this protocol can handle the given request.
+      return true
+  }
+
+  override class func canonicalRequest(for request: URLRequest) -> URLRequest {
+      // Here you return the canonical version of the request but most of the time you pass the orignal one.
+      return request
+  }
+
+  override func startLoading() {
+      guard let handler = MockURLProtocol.requestHandler else {
+        fatalError("Handler is unavailable.")
+      }
+        
+      do {
+        // 2. Call handler with received request and capture the tuple of response and data.
+        let (response, data) = try handler(request)
+        
+        // 3. Send received response to the client.
+        client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: .notAllowed)
+        
+        if let data = data {
+          // 4. Send received data to the client.
+          client?.urlProtocol(self, didLoad: data)
+        }
+        
+        // 5. Notify request has been finished.
+        client?.urlProtocolDidFinishLoading(self)
+      } catch {
+        // 6. Notify received error.
+        client?.urlProtocol(self, didFailWithError: error)
+      }
+  }
+
+  override func stopLoading() {
+      // This is called if the request gets canceled or completed.
+      print("")
+  }
+}

Shared/ContentView.swift

@@ -4,7 +4,7 @@ import CoreData
 struct ContentView: View {
     var body: some View {
         if Settings.shared.user.token.isEmpty {
-            AuthView(login: "", password: "")
+            AuthView()
         } else {
             EmptyView()
         }

Shared/Extensions/Alert.swift

@@ -0,0 +1,28 @@
+import Foundation
+import SwiftUI
+
+enum AlertMessage: Identifiable {
+    case info(title: String, body: String)
+    case error(error: Error)
+    
+    var id: Int {
+        switch self {
+        case .info(let title, let body):
+            return title.hashValue + body.hashValue
+        case .error(let error):
+            return error.localizedDescription.hashValue
+        }
+    }
+}
+
+extension Alert {
+    init(_ message: AlertMessage) {
+        switch message {
+        case .info(let title, let body):
+            self.init(title: Text(title), message: Text(body))
+        case .error(let error):
+            let msg = (error as NSError).displayMessage
+            self.init(title: Text(msg.title), message: Text(msg.body))
+        }
+    }
+}

Shared/Utils/Api.swift

@@ -95,11 +95,11 @@ public class Api {
     
     // MARK: - AutoCat public API
     
-    public static func login(email: String, password: String) async throws -> User {
+    public func login(email: String, password: String) async throws -> User {
         let body = [
             "email": email,
             "password": password
         ]
-        return try await self.shared.makeBodyRequest(api: "user/login", body: body)
+        return try await self.makeBodyRequest(api: "user/login", body: body)
     }
 }

Shared/ViewModels/AuthVM.swift

@@ -2,6 +2,6 @@ import Foundation
 
 public class AuthVM: ObservableObject {
     public func login(user: String, password: String) async throws {
-        
+        Settings.shared.user = try await Api.shared.login(email: user, password: password)
     }
 }

Shared/Views/AuthView.swift

@@ -3,9 +3,10 @@ import SwiftUI
 struct AuthView: View {
     @ObservedObject var viewModel = AuthVM()
     
-    @State var login: String
+    @State private var login: String = ""
-    @State var password: String
+    @State private var password: String = ""
-    @State var showProgress: Bool = false
+    @State private var showProgress: Bool = false
+    @State private var alert: AlertMessage? = nil
     
     var body: some View {
         ZStack {
@@ -14,11 +15,20 @@ struct AuthView: View {
                 TextField("Login", text: $login)
                 SecureField("Password", text: $password)
                 Button("Login") {
-                    self.showProgress = true
                     async {
-                        try await self.viewModel.login(user: self.login, password: self.password)
+                        do {
+                            self.showProgress = true
+                            try await self.viewModel.login(user: self.login, password: self.password)
+                            self.showProgress = false
+                        } catch {
+                            self.showProgress = false
+                            self.alert = .error(error: error)
+                        }
                     }
                 }
+                .alert(item: $alert) { id in
+                    Alert(id)
+                }
                 Spacer()
             }
             .buttonStyle(.bordered)
@@ -35,9 +45,9 @@ struct AuthView: View {
 struct AuthView_Previews: PreviewProvider {
     static var previews: some View {
         Group {
-            AuthView(login: "", password: "")
+            AuthView()
                 .previewDevice("iPhone 8")
-            AuthView(login: "", password: "")
+            AuthView()
                 .preferredColorScheme(.dark)
                 .previewDevice("iPhone 8")
         }