feat: Implement Twitter provider

Author: russellwheatley

FirebaseSwiftUI/FirebaseTwitterSwiftUI/Sources/Services/TwitterProviderAuthUI.swift

@@ -0,0 +1,53 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import FirebaseAuth
+import FirebaseAuthSwiftUI
+import FirebaseCore
+import SwiftUI
+
+public class TwitterProviderAuthUI: AuthProviderSwift, AuthProviderUI {
+  @MainActor public func createAuthCredential() async throws -> AuthCredential {
+    let provider = OAuthProvider(providerID: providerId)
+    return try await withCheckedThrowingContinuation { continuation in
+      provider.getCredentialWith(nil) { credential, error in
+        if let error {
+          continuation
+            .resume(throwing: AuthServiceError.signInFailed(underlying: error))
+        } else if let credential {
+          continuation.resume(returning: credential)
+        } else {
+          continuation
+            .resume(throwing: AuthServiceError
+              .invalidCredentials("Twitter did not provide a valid AuthCredential"))
+        }
+      }
+    }
+  }
+
+  public var provider: AuthProviderSwift { self }
+  public let id: String = "twitter"
+  let providerId = "twitter.com"
+
+  @MainActor public func authButton() -> AnyView {
+    AnyView(SignInWithTwitterButton())
+  }
+
+// TODO: need to implement delete user protocol
+//  @MainActor public func deleteUser(user _: User) async throws {
+//    <#code#>
+//  }
+
+  public init() {}
+}

FirebaseSwiftUI/FirebaseTwitterSwiftUI/Sources/Views/SignInWithTwitterButton.swift

@@ -0,0 +1,33 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import FirebaseAuthSwiftUI
+import SwiftUI
+
+/// A button for signing in with Twitter/X
+@MainActor
+public struct SignInWithTwitterButton {
+  @Environment(AuthService.self) private var authService
+  public init() {}
+}
+
+extension SignInWithTwitterButton: View {
+  public var body: some View {
+    Button(action: {
+      // TODO: Implement Twitter sign-in action
+    }) {
+      Text("Sign in with Twitter")
+    }
+  }
+}

FirebaseSwiftUI/FirebaseTwitterSwiftUI/Tests/FirebaseTwitterSwiftUITests/FirebaseTwitterSwiftUITests.swift

@@ -0,0 +1,20 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+@testable import FirebaseTwitterSwiftUI
+import Testing
+
+@Test func example() async throws {
+  // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+}

Package.swift

@@ -78,6 +78,10 @@ let package = Package(
       name: "FirebasePhoneAuthSwiftUI",
       targets: ["FirebasePhoneAuthSwiftUI"]
     ),
+    .library(
+      name: "FirebaseTwitterSwiftUI",
+      targets: ["FirebaseTwitterSwiftUI"]
+    ),
   ],
   dependencies: [
     .package(
@@ -307,5 +311,17 @@ let package = Package(
       dependencies: ["FirebasePhoneAuthSwiftUI"],
       path: "FirebaseSwiftUI/FirebasePhoneAuthSwiftUI/Tests/"
     ),
+    .target(
+      name: "FirebaseTwitterSwiftUI",
+      dependencies: [
+        "FirebaseAuthSwiftUI",
+      ],
+      path: "FirebaseSwiftUI/FirebaseTwitterSwiftUI/Sources"
+    ),
+    .testTarget(
+      name: "FirebaseTwitterSwiftUITests",
+      dependencies: ["FirebaseTwitterSwiftUI"],
+      path: "FirebaseSwiftUI/FirebaseTwitterSwiftUI/Tests/"
+    ),
   ]
 )

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample.xcodeproj/project.pbxproj

@@ -11,6 +11,7 @@
 		4600E5542DD777BE00EED5F3 /* FirebaseCore in Frameworks */ = {isa = PBXBuildFile; productRef = 4600E5532DD777BE00EED5F3 /* FirebaseCore */; };
 		4607CC9C2D9BFE29009EC3F5 /* FirebaseAuthSwiftUI in Frameworks */ = {isa = PBXBuildFile; productRef = 4607CC9B2D9BFE29009EC3F5 /* FirebaseAuthSwiftUI */; };
 		4607CC9E2D9BFE29009EC3F5 /* FirebaseGoogleSwiftUI in Frameworks */ = {isa = PBXBuildFile; productRef = 4607CC9D2D9BFE29009EC3F5 /* FirebaseGoogleSwiftUI */; };
+		4681E0002E97F22B00387C88 /* FirebaseTwitterSwiftUI in Frameworks */ = {isa = PBXBuildFile; productRef = 4681DFFF2E97F22B00387C88 /* FirebaseTwitterSwiftUI */; };
 		46CB7B252D773F2100F1FD0A /* GoogleService-Info.plist in Resources */ = {isa = PBXBuildFile; fileRef = 46CB7B242D773F2100F1FD0A /* GoogleService-Info.plist */; };
 		46F89C392D64B04E000F8BC0 /* FirebaseAuthSwiftUI in Frameworks */ = {isa = PBXBuildFile; productRef = 46F89C382D64B04E000F8BC0 /* FirebaseAuthSwiftUI */; };
 		46F89C4D2D64BB9B000F8BC0 /* FirebaseAuthSwiftUI in Frameworks */ = {isa = PBXBuildFile; productRef = 46F89C4C2D64BB9B000F8BC0 /* FirebaseAuthSwiftUI */; };
@@ -83,6 +84,7 @@
 				46F89C4D2D64BB9B000F8BC0 /* FirebaseAuthSwiftUI in Frameworks */,
 				4607CC9E2D9BFE29009EC3F5 /* FirebaseGoogleSwiftUI in Frameworks */,
 				8D808CB92DB081F900D2293F /* FirebasePhoneAuthSwiftUI in Frameworks */,
+				4681E0002E97F22B00387C88 /* FirebaseTwitterSwiftUI in Frameworks */,
 				4607CC9C2D9BFE29009EC3F5 /* FirebaseAuthSwiftUI in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -161,6 +163,7 @@
 				4607CC9D2D9BFE29009EC3F5 /* FirebaseGoogleSwiftUI */,
 				8D808CB62DB0811900D2293F /* FirebaseFacebookSwiftUI */,
 				8D808CB82DB081F900D2293F /* FirebasePhoneAuthSwiftUI */,
+				4681DFFF2E97F22B00387C88 /* FirebaseTwitterSwiftUI */,
 			);
 			productName = FirebaseSwiftUIExample;
 			productReference = 46F89C082D64A86C000F8BC0 /* FirebaseSwiftUIExample.app */;
@@ -660,6 +663,11 @@
 			isa = XCSwiftPackageProductDependency;
 			productName = FirebaseGoogleSwiftUI;
 		};
+		4681DFFF2E97F22B00387C88 /* FirebaseTwitterSwiftUI */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = 8D808CB52DB07EBD00D2293F /* XCLocalSwiftPackageReference "../../../../FirebaseUI-iOS" */;
+			productName = FirebaseTwitterSwiftUI;
+		};
 		46F89C382D64B04E000F8BC0 /* FirebaseAuthSwiftUI */ = {
 			isa = XCSwiftPackageProductDependency;
 			productName = FirebaseAuthSwiftUI;