Refactor APIConfig.endpoint as an associated value of Service

FirebaseVertexAI/Sources/CountTokensRequest.swift

@@ -33,7 +33,7 @@ extension CountTokensRequest: GenerativeAIRequest {
 
   var url: URL {
     URL(string:
-      "\(apiConfig.serviceEndpoint.rawValue)/\(apiConfig.version.rawValue)/\(model):countTokens")!
+      "\(apiConfig.service.endpoint.rawValue)/\(apiConfig.version.rawValue)/\(model):countTokens")!
   }
 }
 

FirebaseVertexAI/Sources/GenerateContentRequest.swift

@@ -55,7 +55,7 @@ extension GenerateContentRequest: GenerativeAIRequest {
   typealias Response = GenerateContentResponse
 
   var url: URL {
-    let modelURL = "\(apiConfig.serviceEndpoint.rawValue)/\(apiConfig.version.rawValue)/\(model)"
+    let modelURL = "\(apiConfig.service.endpoint.rawValue)/\(apiConfig.version.rawValue)/\(model)"
     switch apiMethod {
     case .generateContent:
       return URL(string: "\(modelURL):\(apiMethod.rawValue)")!

FirebaseVertexAI/Sources/Types/Internal/APIConfig.swift

@@ -19,23 +19,16 @@ struct APIConfig: Sendable, Hashable {
   /// This controls which backend API is used by the SDK.
   let service: Service
 
-  /// The specific network address to use for API requests.
-  ///
-  /// This must correspond with the API set in `service`.
-  let serviceEndpoint: ServiceEndpoint
-
   /// The version of the selected API to use, e.g., "v1".
   let version: Version
 
   /// Initializes an API configuration.
   ///
   /// - Parameters:
   ///   - service: The API service to use for generative AI.
-  ///   - serviceEndpoint: The network address to use for the API service.
   ///   - version: The version of the API to use.
-  init(service: Service, serviceEndpoint: ServiceEndpoint, version: Version) {
+  init(service: Service, version: Version) {
     self.service = service
-    self.serviceEndpoint = serviceEndpoint
     self.version = version
   }
 }
@@ -46,7 +39,7 @@ extension APIConfig {
   /// See [Vertex AI and Google AI
   /// differences](https://cloud.google.com/vertex-ai/generative-ai/docs/overview#how-gemini-vertex-different-gemini-aistudio)
   /// for a comparison of the two [API services](https://google.aip.dev/9#api-service).
-  enum Service {
+  enum Service: Hashable {
     /// The Gemini Enterprise API provided by Vertex AI.
     ///
     /// See the [Cloud
@@ -57,13 +50,25 @@ extension APIConfig {
     /// The Gemini Developer API provided by Google AI.
     ///
     /// See the [Google AI docs](https://ai.google.dev/gemini-api/docs) for more details.
-    case developer
+    case developer(endpoint: Endpoint)
+
+    /// The specific network address to use for API requests.
+    ///
+    /// This must correspond with the API set in `service`.
+    var endpoint: Endpoint {
+      switch self {
+      case .vertexAI:
+        return .firebaseVertexAIProd
+      case let .developer(endpoint: endpoint):
+        return endpoint
+      }
+    }
   }
 }
 
-extension APIConfig {
+extension APIConfig.Service {
   /// Network addresses for generative AI API services.
-  enum ServiceEndpoint: String {
+  enum Endpoint: String {
     /// The Vertex AI in Firebase production endpoint.
     case firebaseVertexAIProd = "https://firebasevertexai.googleapis.com"
 

FirebaseVertexAI/Sources/Types/Internal/Imagen/ImagenGenerationRequest.swift

@@ -40,9 +40,8 @@ extension ImagenGenerationRequest: GenerativeAIRequest where ImageType: Decodabl
   typealias Response = ImagenGenerationResponse<ImageType>
 
   var url: URL {
-    return URL(
-      string: "\(apiConfig.serviceEndpoint.rawValue)/\(apiConfig.version.rawValue)/\(model):predict"
-    )!
+    return URL(string:
+      "\(apiConfig.service.endpoint.rawValue)/\(apiConfig.version.rawValue)/\(model):predict")!
   }
 }
 

FirebaseVertexAI/Sources/VertexAI.swift

@@ -38,7 +38,7 @@ public class VertexAI {
     }
     let vertexInstance = vertexAI(app: app, location: location)
     assert(vertexInstance.apiConfig.service == .vertexAI)
-    assert(vertexInstance.apiConfig.serviceEndpoint == .firebaseVertexAIProd)
+    assert(vertexInstance.apiConfig.service.endpoint == .firebaseVertexAIProd)
     assert(vertexInstance.apiConfig.version == .v1beta)
 
     return vertexInstance
@@ -56,7 +56,7 @@ public class VertexAI {
   public static func vertexAI(app: FirebaseApp, location: String = "us-central1") -> VertexAI {
     let vertexInstance = vertexAI(app: app, location: location, apiConfig: defaultVertexAIAPIConfig)
     assert(vertexInstance.apiConfig.service == .vertexAI)
-    assert(vertexInstance.apiConfig.serviceEndpoint == .firebaseVertexAIProd)
+    assert(vertexInstance.apiConfig.service.endpoint == .firebaseVertexAIProd)
     assert(vertexInstance.apiConfig.version == .v1beta)
 
     return vertexInstance
@@ -159,14 +159,9 @@ public class VertexAI {
 
   let location: String?
 
-  static let defaultVertexAIAPIConfig = APIConfig(
-    service: .vertexAI,
-    serviceEndpoint: .firebaseVertexAIProd,
-    version: .v1beta
-  )
+  static let defaultVertexAIAPIConfig = APIConfig(service: .vertexAI, version: .v1beta)
   static let defaultDeveloperAPIConfig = APIConfig(
-    service: .developer,
-    serviceEndpoint: .generativeLanguage,
+    service: .developer(endpoint: .generativeLanguage),
     version: .v1beta
   )
 
@@ -256,14 +251,14 @@ public class VertexAI {
   }
 
   private func developerModelResourceName(modelName: String) -> String {
-    switch apiConfig.serviceEndpoint {
+    switch apiConfig.service.endpoint {
     case .firebaseVertexAIStaging:
       let projectID = firebaseInfo.projectID
       return "projects/\(projectID)/models/\(modelName)"
     case .generativeLanguage:
       return "models/\(modelName)"
     default:
-      fatalError("The Developer API is not supported on '\(apiConfig.serviceEndpoint)'.")
+      fatalError("The Developer API is not supported on '\(apiConfig.service.endpoint)'.")
     }
   }
 

FirebaseVertexAI/Tests/Unit/ChatTests.swift

@@ -44,7 +44,7 @@
     #if os(watchOS)
       throw XCTSkip("Custom URL protocols are unsupported in watchOS 2 and later.")
     #endif // os(watchOS)
     MockURLProtocol.requestHandler = { request in
       let response = HTTPURLResponse(
         url: request.url!,
         statusCode: 200,
@@ -65,11 +65,7 @@
         googleAppID: "My app ID",
         firebaseApp: app
       ),
-      apiConfig: APIConfig(
-        service: .vertexAI,
-        serviceEndpoint: .firebaseVertexAIProd,
-        version: .v1beta
-      ),
+      apiConfig: APIConfig(service: .vertexAI, version: .v1beta),
       tools: nil,
       requestOptions: RequestOptions(),
       urlSession: urlSession

FirebaseVertexAI/Tests/Unit/GenerativeModelTests.swift

@@ -58,11 +58,7 @@
   ].sorted()
   let testModelResourceName =
     "projects/test-project-id/locations/test-location/publishers/google/models/test-model"
-  let apiConfig = APIConfig(
-    service: .vertexAI,
-    serviceEndpoint: .firebaseVertexAIProd,
-    version: .v1beta
-  )
+  let apiConfig = APIConfig(service: .vertexAI, version: .v1beta)
 
   var urlSession: URLSession!
   var model: GenerativeModel!
@@ -1496,7 +1492,7 @@
     #if os(watchOS)
       throw XCTSkip("Custom URL protocols are unsupported in watchOS 2 and later.")
     #endif // os(watchOS)
     return { request in
       // This is *not* an HTTPURLResponse
       let response = URLResponse(
         url: request.url!,
@@ -1523,7 +1519,7 @@
     #if os(watchOS)
       throw XCTSkip("Custom URL protocols are unsupported in watchOS 2 and later.")
     #endif // os(watchOS)
     let bundle = BundleTestUtil.bundle()
     let fileURL = try XCTUnwrap(bundle.url(forResource: name, withExtension: ext))
     return { request in
       let requestURL = try XCTUnwrap(request.url)

FirebaseVertexAI/Tests/Unit/Types/Imagen/ImagenGenerationRequestTests.swift

@@ -36,11 +36,7 @@ final class ImagenGenerationRequestTests: XCTestCase {
     addWatermark: nil,
     includeResponsibleAIFilterReason: includeResponsibleAIFilterReason
   )
-  let apiConfig = APIConfig(
-    service: .vertexAI,
-    serviceEndpoint: .firebaseVertexAIProd,
-    version: .v1beta
-  )
+  let apiConfig = APIConfig(service: .vertexAI, version: .v1beta)
 
   let instance = ImageGenerationInstance(prompt: "test-prompt")
 
@@ -64,7 +60,7 @@ final class ImagenGenerationRequestTests: XCTestCase {
     XCTAssertEqual(
       request.url,
       URL(string:
-        "\(apiConfig.serviceEndpoint.rawValue)/\(apiConfig.version.rawValue)/\(modelName):predict")
+        "\(apiConfig.service.endpoint.rawValue)/\(apiConfig.version.rawValue)/\(modelName):predict")
     )
   }
 
@@ -84,7 +80,7 @@ final class ImagenGenerationRequestTests: XCTestCase {
     XCTAssertEqual(
       request.url,
       URL(string:
-        "\(apiConfig.serviceEndpoint.rawValue)/\(apiConfig.version.rawValue)/\(modelName):predict")
+        "\(apiConfig.service.endpoint.rawValue)/\(apiConfig.version.rawValue)/\(modelName):predict")
     )
   }
 

FirebaseVertexAI/Tests/Unit/Types/Internal/APIConfigTests.swift

@@ -19,49 +19,34 @@ import XCTest
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 final class APIConfigTests: XCTestCase {
   func testInitialize_vertexAI_prod_v1() {
-    let apiConfig = APIConfig(
-      service: .vertexAI,
-      serviceEndpoint: .firebaseVertexAIProd,
-      version: .v1
-    )
+    let apiConfig = APIConfig(service: .vertexAI, version: .v1)
 
-    XCTAssertEqual(apiConfig.serviceEndpoint.rawValue, "https://firebasevertexai.googleapis.com")
+    XCTAssertEqual(apiConfig.service.endpoint.rawValue, "https://firebasevertexai.googleapis.com")
     XCTAssertEqual(apiConfig.version.rawValue, "v1")
   }
 
   func testInitialize_vertexAI_prod_v1beta() {
-    let apiConfig = APIConfig(
-      service: .vertexAI,
-      serviceEndpoint: .firebaseVertexAIProd,
-      version: .v1beta
-    )
+    let apiConfig = APIConfig(service: .vertexAI, version: .v1beta)
 
-    XCTAssertEqual(apiConfig.serviceEndpoint.rawValue, "https://firebasevertexai.googleapis.com")
+    XCTAssertEqual(apiConfig.service.endpoint.rawValue, "https://firebasevertexai.googleapis.com")
     XCTAssertEqual(apiConfig.version.rawValue, "v1beta")
   }
 
   func testInitialize_developer_staging_v1beta() {
     let apiConfig = APIConfig(
-      service: .developer,
-      serviceEndpoint: .firebaseVertexAIStaging,
-      version: .v1beta
+      service: .developer(endpoint: .firebaseVertexAIStaging), version: .v1beta
     )
 
     XCTAssertEqual(
-      apiConfig.serviceEndpoint.rawValue,
-      "https://staging-firebasevertexai.sandbox.googleapis.com"
+      apiConfig.service.endpoint.rawValue, "https://staging-firebasevertexai.sandbox.googleapis.com"
     )
     XCTAssertEqual(apiConfig.version.rawValue, "v1beta")
   }
 
   func testInitialize_developer_generativeLanguage_v1beta() {
-    let apiConfig = APIConfig(
-      service: .developer,
-      serviceEndpoint: .generativeLanguage,
-      version: .v1beta
-    )
+    let apiConfig = APIConfig(service: .developer(endpoint: .generativeLanguage), version: .v1beta)
 
-    XCTAssertEqual(apiConfig.serviceEndpoint.rawValue, "https://generativelanguage.googleapis.com")
+    XCTAssertEqual(apiConfig.service.endpoint.rawValue, "https://generativelanguage.googleapis.com")
     XCTAssertEqual(apiConfig.version.rawValue, "v1beta")
   }
 }

FirebaseVertexAI/Tests/Unit/VertexComponentTests.swift

@@ -60,7 +60,7 @@ class VertexComponentTests: XCTestCase {
     XCTAssertEqual(vertex.firebaseInfo.apiKey, VertexComponentTests.apiKey)
     XCTAssertEqual(vertex.location, location)
     XCTAssertEqual(vertex.apiConfig.service, .vertexAI)
-    XCTAssertEqual(vertex.apiConfig.serviceEndpoint, .firebaseVertexAIProd)
+    XCTAssertEqual(vertex.apiConfig.service.endpoint, .firebaseVertexAIProd)
     XCTAssertEqual(vertex.apiConfig.version, .v1beta)
   }
 
@@ -73,7 +73,7 @@ class VertexComponentTests: XCTestCase {
     XCTAssertEqual(vertex.firebaseInfo.apiKey, VertexComponentTests.apiKey)
     XCTAssertEqual(vertex.location, location)
     XCTAssertEqual(vertex.apiConfig.service, .vertexAI)
-    XCTAssertEqual(vertex.apiConfig.serviceEndpoint, .firebaseVertexAIProd)
+    XCTAssertEqual(vertex.apiConfig.service.endpoint, .firebaseVertexAIProd)
     XCTAssertEqual(vertex.apiConfig.version, .v1beta)
   }
 
@@ -179,8 +179,7 @@ class VertexComponentTests: XCTestCase {
   func testModelResourceName_developerAPI_firebaseVertexAI() throws {
     let app = try XCTUnwrap(VertexComponentTests.app)
     let apiConfig = APIConfig(
-      service: .developer,
-      serviceEndpoint: .firebaseVertexAIStaging,
+      service: .developer(endpoint: .firebaseVertexAIStaging),
       version: .v1beta
     )
     let vertex = VertexAI.developerAPI(app: app, apiConfig: apiConfig)