Add support for R-GCIP tenant configuration

ExchangeTokenRequestTests.swift

@@ -0,0 +1,154 @@
+// Copyright 2023 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 Foundation
+import XCTest
+
+@testable import FirebaseAuth
+import FirebaseCore
+
+/// Tests for `ExchangeTokenRequest`
+@available(iOS 13, *)
+class ExchangeTokenRequestTests: XCTestCase {
+  // MARK: - Constants for Testing
+
+  let kAPIKey = "test-api-key"
+  let kProjectID = "test-project-id"
+  let kLocation = "us-east1"
+  let kTenantID = "test-tenant-id-123"
+  let kIdToken = "a-very-long-and-secure-oidc-token-string"
+  let kIdpConfigId = "oidc.my-test-provider"
+
+  let kProductionHost = "identityplatform.googleapis.com"
+  let kStagingHost = "staging-identityplatform.sandbox.googleapis.com"
+
+  // MARK: - Test Cases
+
+  /// Tests that the production URL is correctly formed for a specific region.
+  func testProductionURLIsCorrectlyConstructed() {
+    let (auth, app) = createTestAuthInstance(
+      projectID: kProjectID,
+      location: kLocation,
+      tenantId: kTenantID
+    )
+
+    let request = ExchangeTokenRequest(
+      idToken: kIdToken,
+      idpConfigID: kIdpConfigId,
+      config: auth.requestConfiguration,
+      useStaging: false
+    )
+
+    let expectedHost = "\(kLocation)-\(kProductionHost)"
+    let expectedURL = "https://\(expectedHost)/v2beta/projects/\(kProjectID)" +
+      "/locations/\(kLocation)/tenants/\(kTenantID)/idpConfigs/\(kIdpConfigId):exchangeOidcToken?key=\(kAPIKey)"
+
+    XCTAssertEqual(request.requestURL().absoluteString, expectedURL)
+  }
+
+  /// Tests that the production URL is correctly formed for the "prod-global" location.
+  func testProductionURLIsCorrectlyConstructedForGlobalLocation() {
+    let (auth, app) = createTestAuthInstance(
+      projectID: kProjectID,
+      location: "prod-global",
+      tenantId: kTenantID
+    )
+    _ = app
+
+    let request = ExchangeTokenRequest(
+      idToken: kIdToken,
+      idpConfigID: kIdpConfigId,
+      config: auth.requestConfiguration,
+      useStaging: false
+    )
+
+    let expectedHost = kProductionHost
+    let expectedURL = "https://\(expectedHost)/v2beta/projects/\(kProjectID)" +
+      "/locations/global/tenants/\(kTenantID)/idpConfigs/\(kIdpConfigId):exchangeOidcToken?key=\(kAPIKey)"
+
+    XCTAssertEqual(request.requestURL().absoluteString, expectedURL)
+  }
+
+  /// Tests that the staging URL is correctly formed.
+  func testStagingURLIsCorrectlyConstructed() {
+    let (auth, app) = createTestAuthInstance(
+      projectID: kProjectID,
+      location: kLocation,
+      tenantId: kTenantID
+    )
+    _ = app
+
+    let request = ExchangeTokenRequest(
+      idToken: kIdToken,
+      idpConfigID: kIdpConfigId,
+      config: auth.requestConfiguration,
+      useStaging: true
+    )
+
+    let expectedHost = "\(kLocation)-\(kStagingHost)"
+    let expectedURL = "https://\(expectedHost)/v2beta/projects/\(kProjectID)" +
+      "/locations/\(kLocation)/tenants/\(kTenantID)/idpConfigs/\(kIdpConfigId):exchangeOidcToken?key=\(kAPIKey)"
+
+    XCTAssertEqual(request.requestURL().absoluteString, expectedURL)
+  }
+
+  /// Tests that the unencoded HTTP body contains the correct id_token.
+  func testUnencodedHTTPBodyIsCorrect() {
+    let (auth, app) = createTestAuthInstance(
+      projectID: kProjectID,
+      location: kLocation,
+      tenantId: kTenantID
+    )
+    _ = app
+
+    let request = ExchangeTokenRequest(
+      idToken: kIdToken,
+      idpConfigID: kIdpConfigId,
+      config: auth.requestConfiguration
+    )
+
+    let body = request.unencodedHTTPRequestBody
+    XCTAssertNotNil(body)
+    XCTAssertEqual(body?.count, 1)
+    XCTAssertEqual(body?["id_token"] as? String, kIdToken)
+  }
+
+  // MARK: - Helper Function
+
+  /// Creates a test FirebaseApp and Auth instance with specified configurations.
+  private func createTestAuthInstance(projectID: String?, location: String?,
+                                      tenantId: String?) -> (auth: Auth, app: FirebaseApp) {
+    let appName = "TestApp-\(UUID().uuidString)"
+    let options = FirebaseOptions(
+      googleAppID: "1:1234567890:ios:abcdef123456",
+      gcmSenderID: "1234567890"
+    )
+    options.apiKey = kAPIKey
+    if let projectID = projectID {
+      options.projectID = projectID
+    }
+
+    if FirebaseApp.app(name: appName) != nil {
+      FirebaseApp.app(name: appName)?.delete { _ in }
+    }
+    let app = FirebaseApp(instanceWithName: appName, options: options)
+
+    let auth = Auth(app: app)
+    auth.app = app
+    auth.requestConfiguration.location = location
+    auth.requestConfiguration.tenantId = tenantId
+
+    return (auth, app)
+  }
+}