Option to bulk generate alt texts

alt-text-generator-gpt-vision.php

@@ -4,7 +4,7 @@
  * Plugin Name: AI Alt Text Generator for GPT Vision
  * Plugin URI: https://github.com/android-com-pl/wp-ai-alt-generator
  * Description: Automatically generate alternative text for images using OpenAI's GPT Vision API.
- * Version: 2.0.3
+ * Version: 2.1.0
  * Requires at least: 6.3
  * Requires PHP: 8.1
  * Author: android.com.pl
@@ -36,9 +36,17 @@ class AltGeneratorPlugin {
 	public function __construct() {
 		add_filter( 'wp_generate_attachment_metadata', [ AltGenerator::class, 'on_attachment_upload' ], 10, 3 );
 		add_action( 'rest_api_init', [ ( new Api() ), 'register_routes' ] );
+
 		add_action( 'enqueue_block_editor_assets', fn()=> $this->enqueue_script( 'editor' ) );
 		add_action( 'wp_enqueue_media', fn()=> $this->enqueue_script( 'media-modal', true ) );
 		add_action( 'admin_enqueue_scripts', fn()=> $this->enqueue_attachment_edit_page_script() );
+
+		add_action( 'load-upload.php', fn()=> $this->enqueue_script( 'media-upload', true ) );
+		add_filter(
+			'bulk_actions-upload',
+			fn( $actions ) => $actions + [ 'generate_alt_text' => __( 'Generate Alternative Text', 'alt-text-generator-gpt-vision' ) ]
+		);
+
 		add_action( 'activated_plugin', [ $this,'redirect_to_plugin_settings_after_activation' ] );
 		add_filter( 'plugin_row_meta', [ $this, 'plugin_row_meta' ], 10, 2 );
 	}
@@ -62,6 +70,12 @@ private function enqueue_script( string $file_name, array|bool $args = false ):
 		$handle     = "acpl/ai-alt-generator/$file_name";
 		wp_enqueue_script( $handle, ACPL_AI_ALT_PLUGIN_URL . "build/$file_name.js", $asset_file['dependencies'], $asset_file['version'], $args );
 		wp_set_script_translations( $handle, 'alt-text-generator-gpt-vision' );
+
+		foreach ( $asset_file['dependencies'] as $dependency ) {
+			if ( 'wp-components' === $dependency ) {
+				wp_enqueue_style( 'wp-components' );
+			}
+		}
 	}
 
 	private function enqueue_attachment_edit_page_script(): void {

includes/AltGenerator.php

@@ -9,7 +9,7 @@ class AltGenerator {
 	const API_URL = 'https://api.openai.com/v1/chat/completions';
 	const MODEL   = 'gpt-4-vision-preview';
 
-	public static function generate_alt_text( int $attachment_id ): string|WP_Error {
+	public static function generate_alt_text( int $attachment_id, string $user_prompt = '' ): string|WP_Error {
 		if ( ! wp_attachment_is_image( $attachment_id ) ) {
 			return ErrorCodes::Not_image->to_wp_error( [ 'attachment_id' => $attachment_id ] );
 		}
@@ -24,13 +24,6 @@ public static function generate_alt_text( int $attachment_id ): string|WP_Error
 		$locale   = get_locale();
 		$language = locale_get_display_language( $locale );
 
-		$user_prompt = apply_filters(
-			'acpl/ai_alt_generator/user_prompt',
-			"Generate a high-quality and concise alt text in $language ($locale) for the provided image without adding any additional comments.",
-			$locale,
-			$language
-		);
-
 		$image_mime_type = get_post_mime_type( $attachment_id );
 		$image_base64    = self::get_image_as_base64( $attachment_id );
 
@@ -51,12 +44,28 @@ public static function generate_alt_text( int $attachment_id ): string|WP_Error
 					[
 						'model'      => self::MODEL,
 						'messages'   => [
+							[
+								'role'    => 'system',
+								'content' => apply_filters(
+									'acpl/ai_alt_generator/system_prompt',
+									"Generate a high-quality and concise alt text in $language ($locale) for the provided image without adding any additional comments.",
+									$attachment_id,
+									$locale,
+									$language
+								),
+							],
 							[
 								'role'    => 'user',
 								'content' => [
 									[
 										'type' => 'text',
-										'text' => $user_prompt,
+										'text' => apply_filters(
+											'acpl/ai_alt_generator/user_prompt',
+											$user_prompt,
+											$attachment_id,
+											$locale,
+											$language
+										),
 									],
 									[
 										'type'      => 'image_url',
@@ -79,7 +88,7 @@ public static function generate_alt_text( int $attachment_id ): string|WP_Error
 
 		$completion = json_decode( wp_remote_retrieve_body( $api_response ), true );
 
-		if ( $completion['error'] ) {
+		if ( isset( $completion['error'] ) ) {
 			return new WP_Error(
 				$completion['error']['code'],
 				// translators: %s is the error message from OpenAI's API.
@@ -90,12 +99,12 @@ public static function generate_alt_text( int $attachment_id ): string|WP_Error
 		return $completion['choices'][0]['message']['content'] ?? '';
 	}
 
-	public static function generate_and_set_alt_text( int $attachment_id ): ?string {
-		$alt_text = self::generate_alt_text( $attachment_id );
+	public static function generate_and_set_alt_text( int $attachment_id, string $user_prompt = '' ): string|WP_Error|null {
+		$alt_text = self::generate_alt_text( $attachment_id, $user_prompt );
 		if ( is_wp_error( $alt_text ) ) {
 			AltGeneratorPlugin::error_log( $alt_text );
 
-			return null;
+			return $alt_text;
 		}
 
 		if ( ! empty( $alt_text ) ) {

includes/Api.php

@@ -5,19 +5,31 @@
 use WP_Error;
 use WP_REST_Request;
 use WP_REST_Response;
+use WP_REST_Server;
 
 class Api {
 	public function register_routes(): void {
 		register_rest_route(
 			'acpl',
 			'/ai-alt-generator',
 			[
-				'methods'             => 'POST',
+				'methods'             => WP_REST_Server::CREATABLE,
 				'args'                => [
 					'attachment_id' => [
 						'required' => true,
 						'type'     => 'integer',
 					],
+					'user_prompt'   => [
+						'required'          => false,
+						'type'              => 'string',
+						'sanitize_callback' => 'sanitize_text_field',
+					],
+					'save'          => [
+						'required'    => false,
+						'type'        => 'boolean',
+						'default'     => false,
+						'description' => esc_html__( 'Saves the generated alt text to the image when enabled.', 'alt-text-generator-gpt-vision' ),
+					],
 				],
 				'callback'            => [ $this, 'generate_alt_text' ],
 				'permission_callback' => fn() => current_user_can( 'edit_posts' ),
@@ -27,8 +39,14 @@ public function register_routes(): void {
 
 	public function generate_alt_text( WP_REST_Request $request ): WP_REST_Response|WP_Error {
 		$attachment_id = $request->get_param( 'attachment_id' );
+		$save_alt      = $request->get_param( 'save' );
+		$user_prompt   = $request->get_param( 'user_prompt' ) ?? '';
 
-		$alt_text = AltGenerator::generate_alt_text( $attachment_id );
+		if ( $save_alt ) {
+			$alt_text = AltGenerator::generate_and_set_alt_text( $attachment_id, $user_prompt );
+		} else {
+			$alt_text = AltGenerator::generate_alt_text( $attachment_id, $user_prompt );
+		}
 
 		if ( is_wp_error( $alt_text ) ) {
 			return $alt_text;