initial commit

2026-07-08 22:07:40 +00:00 · 2025-01-08 12:45:00 +02:00
commit 6df493fab3
86 changed files with 11890 additions and 0 deletions
@@ -0,0 +1,91 @@
+<?php
+
+namespace App\Services\Google;
+
+use App\Services\Google\DTO\ImageGenerationRequest;
+use App\Services\Google\DTO\ImageGenerationResponse;
+
+/**
+ * ref: https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/imagen-api
+ */
+class ImageGenerationService
+{
+    private readonly string $imagenModel;
+
+    public function __construct(
+        private readonly ApiAuthService $apiAuthService,
+        private readonly EndpointBuilderService $endpointBuilderService,
+    )
+    {
+        $this->imagenModel = env('GOOGLE_IMAGEN_MODEL');
+    }
+
+    /**
+     * @throws \Exception
+     */
+    public function generateImage(ImageGenerationRequest $request): ImageGenerationResponse
+    {
+        $requestBody = $this->buildRequestBody($request);
+
+        return $this->sendGenerationRequest($requestBody);
+    }
+
+    private function buildRequestBody(ImageGenerationRequest $request): string {
+        $instance = [
+            'prompt' => $request->prompt,
+        ];
+        if ($request->negativePrompt) {
+            $instance['negativePrompt'] = $request->negativePrompt;
+        }
+
+        $parameters = [
+            'sampleCount' => 1,
+        ];
+
+        if ($request->sampleCount) {
+            $parameters['sampleCount'] = $request->sampleCount;
+        }
+        if ($request->aspectRatio) {
+            $parameters['aspectRatio'] = $request->aspectRatio;
+        }
+        if ($request->safetySetting) {
+            $parameters['safetySetting'] = $request->safetySetting;
+        }
+
+        $requestBody = [
+            'instances' => [$instance],
+            'parameters' => $parameters
+        ];
+
+        return json_encode($requestBody);
+    }
+
+    /**
+     * @throws \Google\Exception
+     * @throws \Exception
+     */
+    private function sendGenerationRequest(string $requestBody): ImageGenerationResponse
+    {
+        $endpoint = $this->endpointBuilderService->buildPredictionEndpoint($this->imagenModel);
+        $accessToken = $this->apiAuthService->getAccessToken();
+
+        $ch = curl_init($endpoint);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_POST, true);
+        curl_setopt($ch, CURLOPT_POSTFIELDS, $requestBody);
+        curl_setopt($ch, CURLOPT_HTTPHEADER, [
+            'Authorization: Bearer ' . $accessToken,
+            'Content-Type: application/json',
+        ]);
+
+        $response = curl_exec($ch);
+        if (curl_errno($ch) || $response === false) {
+            throw new \Exception(curl_error($ch));
+        }
+        curl_close($ch);
+
+        $responseArray = json_decode($response, true);
+
+        return new ImageGenerationResponse($responseArray);
+    }
+}