chore: Add example for native Sign in with Apple (#62)

Guilherme Souza · web-flow · commit 7e68caee30ab · 2023-07-09T15:26:49.000-03:00
* Adds signInWithApple method

* Mark signInWithApple as Experimental

* Add method for SIWA as a 2 steps process

* Remove signInWithApple method and add example

* Remove import not needed

* Fix preview

* Import GoTrue as Experimental
diff --git a/Examples/Examples.xcodeproj/project.pbxproj b/Examples/Examples.xcodeproj/project.pbxproj
@@ -14,6 +14,7 @@
 		798AD52129072C22001B4801 /* AppView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 798AD52029072C22001B4801 /* AppView.swift */; };
 		798AD5232907309C001B4801 /* SessionView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 798AD5222907309C001B4801 /* SessionView.swift */; };
 		798AD525290731A0001B4801 /* AuthWithEmailAndPasswordView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 798AD524290731A0001B4801 /* AuthWithEmailAndPasswordView.swift */; };
+		79C17A802A589EC000C67A61 /* SignInWithAppleView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79C17A7F2A589EC000C67A61 /* SignInWithAppleView.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -26,6 +27,7 @@
 		798AD52029072C22001B4801 /* AppView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppView.swift; sourceTree = "<group>"; };
 		798AD5222907309C001B4801 /* SessionView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SessionView.swift; sourceTree = "<group>"; };
 		798AD524290731A0001B4801 /* AuthWithEmailAndPasswordView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AuthWithEmailAndPasswordView.swift; sourceTree = "<group>"; };
+		79C17A7F2A589EC000C67A61 /* SignInWithAppleView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SignInWithAppleView.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -83,6 +85,7 @@
 				18DE589E286B2C77005F7FF2 /* ExamplesApp.swift */,
 				1820720D286B449B0009D0BF /* Secrets.swift */,
 				798AD5222907309C001B4801 /* SessionView.swift */,
+				79C17A7F2A589EC000C67A61 /* SignInWithAppleView.swift */,
 			);
 			path = Sources;
 			sourceTree = "<group>";
@@ -164,6 +167,7 @@
 				798AD52129072C22001B4801 /* AppView.swift in Sources */,
 				798AD525290731A0001B4801 /* AuthWithEmailAndPasswordView.swift in Sources */,
 				798AD5232907309C001B4801 /* SessionView.swift in Sources */,
+				79C17A802A589EC000C67A61 /* SignInWithAppleView.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
diff --git a/Examples/Shared/Examples.entitlements b/Examples/Shared/Examples.entitlements
@@ -2,6 +2,10 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>com.apple.developer.applesignin</key>
+	<array>
+		<string>Default</string>
+	</array>
 	<key>com.apple.security.app-sandbox</key>
 	<true/>
 	<key>com.apple.security.network.client</key>
diff --git a/Examples/Shared/Sources/AppView.swift b/Examples/Shared/Sources/AppView.swift
@@ -16,6 +16,10 @@ struct AppView: View {
             NavigationLink("Auth with Email and Password") {
               AuthWithEmailAndPasswordView()
             }
+
+            NavigationLink("Sign in with Apple") {
+              SignInWithAppleView()
+            }
           }
           .listStyle(.plain)
           .navigationTitle("Examples")
diff --git a/Examples/Shared/Sources/SignInWithAppleView.swift b/Examples/Shared/Sources/SignInWithAppleView.swift
@@ -0,0 +1,87 @@
+//
+//  SignInWithAppleView.swift
+//  Examples
+//
+//  Created by Guilherme Souza on 07/07/23.
+//
+
+import AuthenticationServices
+import CryptoKit
+import SwiftUI
+@_spi(Experimental) import GoTrue
+
+struct SignInWithAppleView: View {
+  @Environment(\.goTrueClient) private var client
+  @State var nonce: String?
+
+  var body: some View {
+    SignInWithAppleButton { request in
+//      self.nonce = sha256(randomString())
+//      request.nonce = nonce
+      request.requestedScopes = [.email, .fullName]
+    } onCompletion: { result in
+      Task {
+        do {
+          guard let credential = try result.get().credential as? ASAuthorizationAppleIDCredential
+          else {
+            return
+          }
+
+          guard let idToken = credential.identityToken
+            .flatMap({ String(data: $0, encoding: .utf8) })
+          else {
+            return
+          }
+
+          try await client.signInWithIdToken(
+            credentials: .init(
+              provider: .apple,
+              idToken: idToken/*,
+              nonce: self.nonce*/
+            )
+          )
+        } catch {
+          dump(error)
+        }
+      }
+    }
+    .fixedSize()
+  }
+}
+
+func randomString(length: Int = 32) -> String {
+  precondition(length > 0)
+  var randomBytes = [UInt8](repeating: 0, count: length)
+  let errorCode = SecRandomCopyBytes(kSecRandomDefault, randomBytes.count, &randomBytes)
+  if errorCode != errSecSuccess {
+    fatalError(
+      "Unable to generate nonce. SecRandomCopyBytes failed with OSStatus \(errorCode)"
+    )
+  }
+
+  let charset: [Character] =
+    Array("0123456789ABCDEFGHIJKLMNOPQRSTUVXYZabcdefghijklmnopqrstuvwxyz-._")
+
+  let nonce = randomBytes.map { byte in
+    // Pick a random character from the set, wrapping around if needed.
+    charset[Int(byte) % charset.count]
+  }
+
+  return String(nonce)
+}
+
+func sha256(_ input: String) -> String {
+  let inputData = Data(input.utf8)
+  let hashedData = SHA256.hash(data: inputData)
+  let hashString = hashedData.compactMap {
+    String(format: "%02x", $0)
+  }.joined()
+
+  return hashString
+}
+
+struct SignInWithApple_PreviewProvider: PreviewProvider {
+  static var previews: some View {
+    SignInWithAppleView()
+  }
+}
diff --git a/Sources/GoTrue/GoTrueClient.swift b/Sources/GoTrue/GoTrueClient.swift
@@ -167,6 +167,7 @@ public final class GoTrueClient {
 
   /// Allows signing in with an ID token issued by certain supported providers.
   /// The ID token is verified for validity and a new session is established.
+  @_spi(Experimental)
   @discardableResult
   public func signInWithIdToken(credentials: OpenIDConnectCredentials) async throws -> Session {
     try await _signIn(
diff --git a/Tests/GoTrueTests/GoTrueTests.swift b/Tests/GoTrueTests/GoTrueTests.swift
@@ -1,7 +1,7 @@
 import Mocker
 import XCTest
 
-@testable import GoTrue
+@testable @_spi(Experimental) import GoTrue
 
 final class InMemoryLocalStorage: GoTrueLocalStorage, @unchecked Sendable {
   private let queue = DispatchQueue(label: "InMemoryLocalStorage")

Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,10 @@ struct AppView: View {`
`16`	`16`	`NavigationLink("Auth with Email and Password") {`
`17`	`17`	`AuthWithEmailAndPasswordView()`
`18`	`18`	`}`
	`19`	`+`
	`20`	`+ NavigationLink("Sign in with Apple") {`
	`21`	`+ SignInWithAppleView()`
	`22`	`+ }`
`19`	`23`	`}`
`20`	`24`	`.listStyle(.plain)`
`21`	`25`	`.navigationTitle("Examples")`