Swift: Add Sign In With Apple example

swift/example_code/apple/Buckets/Buckets.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

swift/example_code/apple/Buckets/Buckets.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict/>
+</plist>

swift/example_code/apple/Buckets/Buckets/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

swift/example_code/apple/Buckets/Buckets/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,63 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "16x16"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "32x32"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "128x128"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "256x256"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "1x",
+      "size" : "512x512"
+    },
+    {
+      "idiom" : "mac",
+      "scale" : "2x",
+      "size" : "512x512"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

swift/example_code/apple/Buckets/Buckets/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

swift/example_code/apple/Buckets/Buckets/Buckets.entitlements

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!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.files.user-selected.read-only</key>
+	<true/>
+	<key>com.apple.security.network.client</key>
+	<true/>
+</dict>
+</plist>

swift/example_code/apple/Buckets/Buckets/BucketsApp.swift

@@ -0,0 +1,14 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import SwiftUI
+
+/// The main SwiftUI entry point.
+@main
+struct BucketsApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView().environmentObject(ViewModel())
+        }
+    }
+}

swift/example_code/apple/Buckets/Buckets/BucketsAppError.swift

@@ -0,0 +1,64 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import Foundation
+
+/// Represents errors that need to be handled or reported to the user.
+enum BucketsAppError: Error, LocalizedError {
+    /// Sign In With Apple request failed.
+    case signInWithAppleFailed
+    /// Sign In With Apple was canceled by the user.
+    case signInWithAppleCanceled
+    /// The `AssumeRoleWithWebIdentity` request failed.
+    case assumeRoleFailed
+    /// The credentials returned by Sign In With Apple is missing
+    /// required information.
+    case credentialsIncomplete
+    /// The authentication request failed.
+    case credentialsFailed
+    /// The `ListBuckets` request did not successfully return a list
+    /// of Amazon S3 buckets.
+    case bucketListMissing
+    /// The token file could not be written to storage.
+    case tokenFileError(reason: String = "Unable to create the token.")
+
+    var errorDescription: String? {
+        switch self {
+        case .signInWithAppleFailed:
+            return "Unable to sign into AWS"
+        case .signInWithAppleCanceled:
+            return "Sign in canceled"
+        case .assumeRoleFailed:
+            return "Unable to access AWS S3"
+        case .credentialsIncomplete:
+            return "Unable to authenticate"
+        case .credentialsFailed:
+            return "Invalid web token"
+        case .bucketListMissing:
+            return "Unable to access AWS S3"
+        case .tokenFileError:
+            return "Token error"
+        }
+    }
+
+    /// A human-readable error message string corresponding to the
+    /// error returned.
+    var recoverySuggestion: String? {
+        switch self {
+        case .signInWithAppleFailed:
+            return "Sign In With Apple returned an error."
+        case .signInWithAppleCanceled:
+            return "User did not authenticate."
+        case .assumeRoleFailed:
+            return "The role could not be assumed using the web token returned by Sign In With Apple."
+        case .credentialsIncomplete:
+            return "The credentials returned by AssumeRoleWithWebIdentity are incomplete."
+        case .credentialsFailed:
+            return "An error occurred while attempting to retrieve credentials from AWS."
+        case .bucketListMissing:
+            return "Amazon S3 did not return a valid bucket list."
+        case .tokenFileError(let reason):
+            return "An error occurred with the local Sign In With Apple token: \(reason)"
+        }
+    }
+}