[Vertex AI] Add ImageGenerationRequest for Imagen

FirebaseVertexAI/Sources/GenerativeAIRequest.swift

@@ -41,3 +41,6 @@ public struct RequestOptions {
     self.timeout = timeout
   }
 }
+
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+extension RequestOptions: Equatable {}

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

@@ -17,6 +17,9 @@ struct ImageGenerationInstance {
   let prompt: String
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+extension ImageGenerationInstance: Equatable {}
+
 // MARK: - Codable Conformance
 
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)

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

@@ -20,6 +20,9 @@ struct ImageGenerationOutputOptions {
   let compressionQuality: Int?
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+extension ImageGenerationOutputOptions: Equatable {}
+
 // MARK: - Codable Conformance
 
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)

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

@@ -26,6 +26,9 @@ struct ImageGenerationParameters {
   let includeResponsibleAIFilterReason: Bool?
 }
 
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+extension ImageGenerationParameters: Equatable {}
+
 // MARK: - Codable Conformance
 
 @available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)

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

@@ -0,0 +1,54 @@
+// Copyright 2024 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
+
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+struct ImageGenerationRequest<ImageType: ImagenImageRepresentable> {
+  let model: String
+  let options: RequestOptions
+  let instances: [ImageGenerationInstance]
+  let parameters: ImageGenerationParameters
+
+  init(model: String, options: RequestOptions, instances: [ImageGenerationInstance],
+       parameters: ImageGenerationParameters) {
+    self.model = model
+    self.options = options
+    self.instances = instances
+    self.parameters = parameters
+  }
+}
+
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+extension ImageGenerationRequest: GenerativeAIRequest where ImageType: Decodable {
+  typealias Response = ImageGenerationResponse<ImageType>
+
+  var url: URL {
+    return URL(string: "\(Constants.baseURL)/\(options.apiVersion)/\(model):predict")!
+  }
+}
+
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+extension ImageGenerationRequest: Encodable {
+  enum CodingKeys: CodingKey {
+    case instances
+    case parameters
+  }
+
+  func encode(to encoder: any Encoder) throws {
+    var container = encoder.container(keyedBy: CodingKeys.self)
+    try container.encode(instances, forKey: .instances)
+    try container.encode(parameters, forKey: .parameters)
+  }
+}

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

@@ -0,0 +1,140 @@
+// Copyright 2024 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 XCTest
+
+@testable import FirebaseVertexAI
+
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
+final class ImageGenerationRequestTests: XCTestCase {
+  let encoder = JSONEncoder()
+  let requestOptions = RequestOptions(timeout: 30.0)
+  let modelName = "test-model-name"
+  let sampleCount = 4
+  let aspectRatio = "16:9"
+  let safetyFilterLevel = "block_low_and_above"
+  let includeResponsibleAIFilterReason = true
+  lazy var parameters = ImageGenerationParameters(
+    sampleCount: sampleCount,
+    storageURI: nil,
+    seed: nil,
+    negativePrompt: nil,
+    aspectRatio: aspectRatio,
+    safetyFilterLevel: safetyFilterLevel,
+    personGeneration: nil,
+    outputOptions: nil,
+    addWatermark: nil,
+    includeResponsibleAIFilterReason: includeResponsibleAIFilterReason
+  )
+
+  let instance = ImageGenerationInstance(prompt: "test-prompt")
+
+  override func setUp() {
+    encoder.outputFormatting = [.sortedKeys, .prettyPrinted, .withoutEscapingSlashes]
+  }
+
+  func testInitializeRequest_inlineDataImage() throws {
+    let request = ImageGenerationRequest<ImagenInlineDataImage>(
+      model: modelName,
+      options: requestOptions,
+      instances: [instance],
+      parameters: parameters
+    )
+
+    XCTAssertEqual(request.model, modelName)
+    XCTAssertEqual(request.options, requestOptions)
+    XCTAssertEqual(request.instances, [instance])
+    XCTAssertEqual(request.parameters, parameters)
+    XCTAssertEqual(
+      request.url,
+      URL(string: "\(Constants.baseURL)/\(requestOptions.apiVersion)/\(modelName):predict")
+    )
+  }
+
+  func testInitializeRequest_fileDataImage() throws {
+    let request = ImageGenerationRequest<ImagenFileDataImage>(
+      model: modelName,
+      options: requestOptions,
+      instances: [instance],
+      parameters: parameters
+    )
+
+    XCTAssertEqual(request.model, modelName)
+    XCTAssertEqual(request.options, requestOptions)
+    XCTAssertEqual(request.instances, [instance])
+    XCTAssertEqual(request.parameters, parameters)
+    XCTAssertEqual(
+      request.url,
+      URL(string: "\(Constants.baseURL)/\(requestOptions.apiVersion)/\(modelName):predict")
+    )
+  }
+
+  // MARK: - Encoding Tests
+
+  func testEncodeRequest_inlineDataImage() throws {
+    let request = ImageGenerationRequest<ImagenInlineDataImage>(
+      model: modelName,
+      options: RequestOptions(),
+      instances: [instance],
+      parameters: parameters
+    )
+
+    let jsonData = try encoder.encode(request)
+
+    let json = try XCTUnwrap(String(data: jsonData, encoding: .utf8))
+    XCTAssertEqual(json, """
+    {
+      "instances" : [
+        {
+          "prompt" : "\(instance.prompt)"
+        }
+      ],
+      "parameters" : {
+        "aspectRatio" : "\(aspectRatio)",
+        "includeRaiReason" : \(includeResponsibleAIFilterReason),
+        "safetySetting" : "\(safetyFilterLevel)",
+        "sampleCount" : \(sampleCount)
+      }
+    }
+    """)
+  }
+
+  func testEncodeRequest_fileDataImage() throws {
+    let request = ImageGenerationRequest<ImagenFileDataImage>(
+      model: modelName,
+      options: RequestOptions(),
+      instances: [instance],
+      parameters: parameters
+    )
+
+    let jsonData = try encoder.encode(request)
+
+    let json = try XCTUnwrap(String(data: jsonData, encoding: .utf8))
+    XCTAssertEqual(json, """
+    {
+      "instances" : [
+        {
+          "prompt" : "\(instance.prompt)"
+        }
+      ],
+      "parameters" : {
+        "aspectRatio" : "\(aspectRatio)",
+        "includeRaiReason" : \(includeResponsibleAIFilterReason),
+        "safetySetting" : "\(safetyFilterLevel)",
+        "sampleCount" : \(sampleCount)
+      }
+    }
+    """)
+  }
+}