分享页面缩略图自定义

backend/application/api/controller/Common.php

@@ -184,6 +184,7 @@ class Common extends Api
         $toLabels = function ($value) {
             return array_values(array_filter(array_map('trim', explode(',', $value ?? ''))));
         };
+        $shareImage = config('site.promotion_share_image') ?? '';
         $config = [
             'languageLabels' => $toLabels($code_languages),
             'frontLabels' => $toLabels($front_techs),
@@ -192,6 +193,8 @@ class Common extends Api
             'developTypes' => $developTypes,
             // 平台服务费比例（0~1），前端据此计算开发者预计到手金额
             'platform_commission_ratio' => (float)DemandService::getPlatformCommissionRatio(),
+            // 推广分享卡片预览图，未配置时为空
+            'promotion_share_image' => $shareImage ? cdnurl($shareImage, true) : '',
         ];
 
         $this->success('', $config);