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<?php
/*
Plugin Name: Yoast Updater API
Description: REST APIを使用してYoast SEOのメタデータを更新するプラグイン。
Version: 1.0
Author: ここに名前を記載
*/

class YoastSEOController extends WP_REST_Controller {
    public function register_routes() {
        register_rest_route('wp/v2/', '/yoast-meta/', array(
            'methods' => 'POST',
            'callback' => [$this, 'update_yoast_meta'],
            'permission_callback' => function () {
                return current_user_can('edit_posts'); // 投稿編集権限を確認
            },
        ));
    }

    public function update_yoast_meta($request) {
        $post_id = $request->get_param('postID');
        $meta_desc = $request->get_param('metaDesc');
        $focus_keyphrase = $request->get_param('focusKeyphrase');
        $seo_title = $request->get_param('seoTitle');

        if (!$post_id || !get_post($post_id)) {
            return new WP_Error('invalid_post', 'Invalid or missing post ID', ['status' => 400]);
        }

        $updated = [];
        if ($meta_desc) {
            update_post_meta($post_id, '_yoast_wpseo_metadesc', sanitize_text_field($meta_desc));
            $updated['meta_description'] = $meta_desc;
        }
        if ($focus_keyphrase) {
            update_post_meta($post_id, '_yoast_wpseo_focuskw', sanitize_text_field($focus_keyphrase));
            $updated['focus_keyphrase'] = $focus_keyphrase;
        }
        if ($seo_title) {
            update_post_meta($post_id, '_yoast_wpseo_title', sanitize_text_field($seo_title));
            $updated['seo_title'] = $seo_title;
        }

        return rest_ensure_response([
            'success' => true,
            'updated_fields' => $updated,
        ]);
    }
}

function register_yoast_seo_controller() {
    $controller = new YoastSEOController();
    $controller->register_routes();
}

add_action('rest_api_init', 'register_yoast_seo_controller');

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POST https://example.com/wp-json/wp/v2/yoast-meta

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{
  "postID": 100
  "metaDesc": "メタディスクリプション",
  "focusKeyphrase": "キーフレーズ",
  "seoTitle": "タイトル"
}