diff --git a/app/Http/Api/Controllers/ChapterController.php b/app/Http/Api/Controllers/ChapterController.php
index 1b96f7c5..dedc7caa 100644
--- a/app/Http/Api/Controllers/ChapterController.php
+++ b/app/Http/Api/Controllers/ChapterController.php
@@ -12,7 +12,6 @@ use App\Services\Logic\Chapter\ChapterLike as ChapterLikeService;
 use App\Services\Logic\Chapter\CommentList as CommentListService;
 use App\Services\Logic\Chapter\ConsultList as ConsultListService;
 use App\Services\Logic\Chapter\Learning as LearningService;
-use App\Services\Logic\Chapter\ResourceList as ResourceListService;
 
 /**
  * @RoutePrefix("/api/chapter")
@@ -44,18 +43,6 @@ class ChapterController extends Controller
         return $this->jsonPaginate($pager);
     }
 
-    /**
-     * @Get("/{id:[0-9]+}/resources", name="api.chapter.resourses")
-     */
-    public function resourcesAction($id)
-    {
-        $service = new ResourceListService();
-
-        $resources = $service->handle($id);
-
-        return $this->jsonSuccess(['resources' => $resources]);
-    }
-
     /**
      * @Get("/{id:[0-9]+}/info", name="api.chapter.info")
      */
@@ -73,6 +60,10 @@ class ChapterController extends Controller
             $this->notFound();
         }
 
+        if ($chapter['me']['logged'] == 0) {
+            $this->unauthorized();
+        }
+
         if ($chapter['me']['owned'] == 0) {
             $this->forbidden();
         }
diff --git a/app/Http/Home/Views/course/show_meta.volt b/app/Http/Home/Views/course/show_meta.volt
index e480730d..ee90ff71 100644
--- a/app/Http/Home/Views/course/show_meta.volt
+++ b/app/Http/Home/Views/course/show_meta.volt
@@ -92,7 +92,7 @@
 <div class="course-meta wrap">
     <div class="cover">
         <span class="model layui-badge layui-bg-green">{{ model_type(course.model) }}</span>
-        <img src="{{ course.cover }}" alt="{{ course.title }}">
+        <img src="{{ course.cover }}!cover_270" alt="{{ course.title }}">
     </div>
     <div class="info">
         {% if course.model == 1 %}
diff --git a/app/Services/ChapterVod.php b/app/Services/ChapterVod.php
index 6b2e174e..51b55431 100644
--- a/app/Services/ChapterVod.php
+++ b/app/Services/ChapterVod.php
@@ -50,7 +50,7 @@ class ChapterVod extends Service
 
         $result = [];
 
-        foreach ($vod->file_transcode as $key => $file) {
+        foreach ($vod->file_transcode as $file) {
             $file['url'] = $vodService->getPlayUrl($file['url']);
             $type = $this->getDefinitionType($file['height']);
             $result[$type] = $file;
diff --git a/app/Traits/Response.php b/app/Traits/Response.php
index 9ba736c2..270fa081 100644
--- a/app/Traits/Response.php
+++ b/app/Traits/Response.php
@@ -9,14 +9,20 @@ namespace App\Traits;
 
 use App\Exceptions\Forbidden as ForbiddenException;
 use App\Exceptions\NotFound as NotFoundException;
-use Phalcon\Config;
-use Phalcon\Di;
+use App\Exceptions\Unauthorized as UnauthorizedException;
+use Phalcon\Config as Config;
+use Phalcon\Di as Di;
 use Phalcon\Http\Request as HttpRequest;
 use Phalcon\Http\Response as HttpResponse;
 
 trait Response
 {
 
+    public function unauthorized()
+    {
+        throw new UnauthorizedException('sys.unauthorized');
+    }
+
     public function forbidden()
     {
         throw new ForbiddenException('sys.forbidden');
diff --git a/db/migrations/20210324064239.php b/db/migrations/20210324064239.php
index 81725855..4320717a 100644
--- a/db/migrations/20210324064239.php
+++ b/db/migrations/20210324064239.php
@@ -2138,7 +2138,7 @@ final class V20210324064239 extends AbstractMigration
             ->addColumn('open_avatar', 'string', [
                 'null' => false,
                 'default' => '',
-                'limit' => 150,
+                'limit' => 255,
                 'collation' => 'utf8mb4_general_ci',
                 'encoding' => 'utf8mb4',
                 'comment' => '开放头像',