From 5f8215f686b4a659e4c4874149a01960d929b738 Mon Sep 17 00:00:00 2001
From: Summer <summer@learnku.com>
Date: Fri, 20 Sep 2019 04:24:21 +0000
Subject: [PATCH] =?UTF-8?q?=E4=BE=A7=E8=BE=B9=E6=A0=8F=E9=93=BE=E6=8E=A5?=
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---
 app/Http/Controllers/CategoriesController.php | 10 ++--
 app/Http/Controllers/TopicsController.php     |  7 ++-
 app/Models/Link.php                           | 23 +++++++++
 app/Observers/LinkObserver.php                | 15 ++++++
 app/Providers/AppServiceProvider.php          |  3 +-
 config/administrator.php                      |  1 +
 config/administrator/links.php                | 51 +++++++++++++++++++
 database/factories/LinkFactory.php            | 10 ++++
 .../2019_09_20_121925_create_links_table.php  | 23 +++++++++
 database/seeds/DatabaseSeeder.php             |  1 +
 database/seeds/LinksTableSeeder.php           | 16 ++++++
 resources/views/topics/_sidebar.blade.php     | 15 ++++++
 12 files changed, 167 insertions(+), 8 deletions(-)
 create mode 100644 app/Models/Link.php
 create mode 100644 app/Observers/LinkObserver.php
 create mode 100644 config/administrator/links.php
 create mode 100644 database/factories/LinkFactory.php
 create mode 100644 database/migrations/2019_09_20_121925_create_links_table.php
 create mode 100644 database/seeds/LinksTableSeeder.php

diff --git a/app/Http/Controllers/CategoriesController.php b/app/Http/Controllers/CategoriesController.php
index 054d8f85e..c8d842484 100644
--- a/app/Http/Controllers/CategoriesController.php
+++ b/app/Http/Controllers/CategoriesController.php
@@ -6,10 +6,11 @@
 use App\Models\Topic;
 use App\Models\Category;
 use App\Models\User;
+use App\Models\Link;
 
 class CategoriesController extends Controller
 {
-    public function show(Category $category, Request $request, Topic $topic, User $user)
+    public function show(Category $category, Request $request, Topic $topic, User $user, Link $link)
     {
         // 读取分类 ID 关联的话题，并按每 20 条分页
         $topics = $topic->withOrder($request->order)
@@ -17,8 +18,9 @@ public function show(Category $category, Request $request, Topic $topic, User $u
                         ->paginate(20);
         // 活跃用户列表
         $active_users = $user->getActiveUsers();
-
-        // 传参变量话题和分类到模板中
-        return view('topics.index', compact('topics', 'category', 'active_users'));
+        // 资源链接
+        $links = $link->getAllCached();
+        // 传参变量到模板中
+        return view('topics.index', compact('topics', 'category', 'active_users', 'links'));
     }
 }
diff --git a/app/Http/Controllers/TopicsController.php b/app/Http/Controllers/TopicsController.php
index 2eb533c05..9991c3187 100644
--- a/app/Http/Controllers/TopicsController.php
+++ b/app/Http/Controllers/TopicsController.php
@@ -10,6 +10,7 @@
 use App\Models\User;
 use Auth;
 use App\Handlers\ImageUploadHandler;
+use App\Models\Link;
 
 class TopicsController extends Controller
 {
@@ -18,11 +19,13 @@ public function __construct()
         $this->middleware('auth', ['except' => ['index', 'show']]);
     }
 
-    public function index(Request $request, Topic $topic, User $user)
+    public function index(Request $request, Topic $topic, User $user, Link $link)
     {
         $topics = $topic->withOrder($request->order)->paginate(20);
         $active_users = $user->getActiveUsers();
-        return view('topics.index', compact('topics', 'active_users'));
+        $links = $link->getAllCached();
+
+        return view('topics.index', compact('topics', 'active_users', 'links'));
     }
 
     public function show(Request $request, Topic $topic)
diff --git a/app/Models/Link.php b/app/Models/Link.php
new file mode 100644
index 000000000..cfe9453c5
--- /dev/null
+++ b/app/Models/Link.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Cache;
+
+class Link extends Model
+{
+    protected $fillable = ['title', 'link'];
+
+    public $cache_key = 'larabbs_links';
+    protected $cache_expire_in_seconds = 1440 * 60;
+
+    public function getAllCached()
+    {
+        // 尝试从缓存中取出 cache_key 对应的数据。如果能取到，便直接返回数据。
+        // 否则运行匿名函数中的代码来取出 links 表中所有的数据，返回的同时做了缓存。
+        return Cache::remember($this->cache_key, $this->cache_expire_in_seconds, function(){
+            return $this->all();
+        });
+    }
+}
diff --git a/app/Observers/LinkObserver.php b/app/Observers/LinkObserver.php
new file mode 100644
index 000000000..191536fc2
--- /dev/null
+++ b/app/Observers/LinkObserver.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Link;
+use Cache;
+
+class LinkObserver
+{
+    // 在保存时清空 cache_key 对应的缓存
+    public function saved(Link $link)
+    {
+        Cache::forget($link->cache_key);
+    }
+}
diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index e70be287a..97d139c41 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -28,7 +28,6 @@ public function boot()
 		\App\Models\User::observe(\App\Observers\UserObserver::class);
 		\App\Models\Reply::observe(\App\Observers\ReplyObserver::class);
 		\App\Models\Topic::observe(\App\Observers\TopicObserver::class);
-
-        //
+        \App\Models\Link::observe(\App\Observers\LinkObserver::class);
     }
 }
diff --git a/config/administrator.php b/config/administrator.php
index 1fe4e39a1..3f829db6d 100644
--- a/config/administrator.php
+++ b/config/administrator.php
@@ -49,6 +49,7 @@
         ],
         '站点管理' => [
             'settings.site',
+            'links',
         ],
     ],
 
diff --git a/config/administrator/links.php b/config/administrator/links.php
new file mode 100644
index 000000000..c27ece078
--- /dev/null
+++ b/config/administrator/links.php
@@ -0,0 +1,51 @@
+<?php
+
+use App\Models\Link;
+
+return [
+    'title'   => '资源推荐',
+    'single'  => '资源推荐',
+
+    'model'   => Link::class,
+
+    // 访问权限判断
+    'permission'=> function()
+    {
+        // 只允许站长管理资源推荐链接
+        return Auth::user()->hasRole('Founder');
+    },
+
+    'columns' => [
+        'id' => [
+            'title' => 'ID',
+        ],
+        'title' => [
+            'title'    => '名称',
+            'sortable' => false,
+        ],
+        'link' => [
+            'title'    => '链接',
+            'sortable' => false,
+        ],
+        'operation' => [
+            'title'  => '管理',
+            'sortable' => false,
+        ],
+    ],
+    'edit_fields' => [
+        'title' => [
+            'title'    => '名称',
+        ],
+        'link' => [
+            'title'    => '链接',
+        ],
+    ],
+    'filters' => [
+        'id' => [
+            'title' => '标签 ID',
+        ],
+        'title' => [
+            'title' => '名称',
+        ],
+    ],
+];
diff --git a/database/factories/LinkFactory.php b/database/factories/LinkFactory.php
new file mode 100644
index 000000000..7881f8212
--- /dev/null
+++ b/database/factories/LinkFactory.php
@@ -0,0 +1,10 @@
+<?php
+
+use Faker\Generator as Faker;
+
+$factory->define(App\Models\Link::class, function (Faker $faker) {
+    return [
+        'title' => $faker->name,
+        'link' => $faker->url,
+    ];
+});
diff --git a/database/migrations/2019_09_20_121925_create_links_table.php b/database/migrations/2019_09_20_121925_create_links_table.php
new file mode 100644
index 000000000..86b909588
--- /dev/null
+++ b/database/migrations/2019_09_20_121925_create_links_table.php
@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateLinksTable extends Migration
+{
+    public function up()
+    {
+        Schema::create('links', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('title')->comment('资源的描述')->index();
+            $table->string('link')->comment('资源的链接')->index();
+            $table->timestamps();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('links');
+    }
+}
diff --git a/database/seeds/DatabaseSeeder.php b/database/seeds/DatabaseSeeder.php
index 285d2de68..c70efffe0 100644
--- a/database/seeds/DatabaseSeeder.php
+++ b/database/seeds/DatabaseSeeder.php
@@ -14,5 +14,6 @@ public function run()
         $this->call(UsersTableSeeder::class);
         $this->call(TopicsTableSeeder::class);
         $this->call(RepliesTableSeeder::class);
+        $this->call(LinksTableSeeder::class);
     }
 }
diff --git a/database/seeds/LinksTableSeeder.php b/database/seeds/LinksTableSeeder.php
new file mode 100644
index 000000000..e4af6a227
--- /dev/null
+++ b/database/seeds/LinksTableSeeder.php
@@ -0,0 +1,16 @@
+<?php
+
+use Illuminate\Database\Seeder;
+use App\Models\Link;
+
+class LinksTableSeeder extends Seeder
+{
+    public function run()
+    {
+        // 生成数据集合
+        $links = factory(Link::class)->times(6)->make();
+
+        // 将数据集合转换为数组，并插入到数据库中
+        Link::insert($links->toArray());
+    }
+}
diff --git a/resources/views/topics/_sidebar.blade.php b/resources/views/topics/_sidebar.blade.php
index 78234b328..05b9be1ba 100644
--- a/resources/views/topics/_sidebar.blade.php
+++ b/resources/views/topics/_sidebar.blade.php
@@ -24,3 +24,18 @@
     </div>
   </div>
 @endif
+@if (count($links))
+  <div class="card mt-4">
+    <div class="card-body pt-2">
+      <div class="text-center mt-1 mb-0 text-muted">资源推荐</div>
+      <hr class="mt-2 mb-3">
+      @foreach ($links as $link)
+        <a class="media mt-1" href="{{ $link->link }}">
+          <div class="media-body">
+            <span class="media-heading text-muted">{{ $link->title }}</span>
+          </div>
+        </a>
+      @endforeach
+    </div>
+  </div>
+@endif