Add new API endpoints for forums and topics

app/Http/Controllers/Forum/ForumsController.php

@@ -10,15 +10,43 @@
 use App\Models\Forum\Topic;
 use App\Models\Forum\TopicTrack;
 use App\Transformers\Forum\ForumCoverTransformer;
+use App\Transformers\Forum\ForumTransformer;
+use App\Transformers\Forum\TopicTransformer;
 use Auth;
 
+/**
+ * @group Forum
+ */
 class ForumsController extends Controller
 {
     public function __construct()
     {
         parent::__construct();
+
+        $this->middleware('require-scopes:public', ['only' => ['index', 'show']]);
     }
 
+    /**
+     * Get Forum Listing
+     *
+     * Get top-level forums, their subforums (max 2 deep), and their last topics.
+     *
+     * ---
+     *
+     * ### Response Format
+     *
+     * Field       | Type                         |
+     * ----------- | ---------------------------- |
+     * forums      | [Forum](#forum)[]            |
+     * last_topics | [ForumTopic](#forum-topic)[] |
+     *
+     * @response {
+     *   "forums": [
+     *     { "forum_id": 1, "...": "..." },
+     *     { "forum_id": 2, "...": "..." }
+     *   ]
+     * }
+     */
     public function index()
     {
         $forums = Forum
@@ -27,12 +55,18 @@ public function index()
             ->orderBy('left_id')
             ->get();
 
-        $lastTopics = Forum::lastTopics();
-
         $forums = $forums->filter(function ($forum) {
             return priv_check('ForumView', $forum)->can();
         });
 
+        if (is_api_request()) {
+            return [
+                'forums' => json_collection($forums, new ForumTransformer(), ['subforums.subforums']),
+            ];
+        }
+
+        $lastTopics = Forum::lastTopics();
+
         return ext_view('forum.forums.index', compact('forums', 'lastTopics'));
     }
 
@@ -53,6 +87,35 @@ public function markAsRead()
         return ext_view('layout.ujs-reload', [], 'js');
     }
 
+    /**
+     * Get Forum and Topics
+     *
+     * Get a forum by id, its pinned topics, recent topics, and its subforums.
+     *
+     * ---
+     *
+     * ### Response Format
+     *
+     * Field         | Type                         |
+     * ------------- | ---------------------------- |
+     * forum         | [Forum](#forum)              |
+     * topics        | [ForumTopic](#forum-topic)[] |
+     * pinned_topics | [ForumTopic](#forum-topic)[] |
+     *
+     * @urlParam forum integer required Id of the forum. Example: 1
+     *
+     * @response {
+     *   "forum": { "id": 1, "...": "..." },
+     *   "topics": [
+     *     { "id": 1, "...": "..." },
+     *     { "id": 2, "...": "..." },
+     *   ],
+     *   "pinned_topics": [
+     *     { "id": 1, "...": "..." },
+     *     { "id": 2, "...": "..." },
+     *   ]
+     * }
+     */
     public function show($id)
     {
         $params = get_params(request()->all(), null, [
@@ -63,18 +126,12 @@ public function show($id)
         $user = auth()->user();
 
         $forum = Forum::with('subforums.subforums')->findOrFail($id);
-        $lastTopics = Forum::lastTopics($forum);
 
         $sort = $params['sort'] ?? Topic::DEFAULT_SORT;
         $withReplies = $params['with_replies'] ?? null;
 
         priv_check('ForumView', $forum)->ensureCan();
 
-        $cover = json_item(
-            $forum->cover()->firstOrNew([]),
-            new ForumCoverTransformer()
-        );
-
         $showDeleted = priv_check('ForumModerate', $forum)->can();
 
         $pinnedTopics = $forum->topics()
@@ -88,8 +145,19 @@ public function show($id)
             ->with('forum')
             ->normal()
             ->showDeleted($showDeleted)
-            ->recent(compact('sort', 'withReplies'))
-            ->paginate();
+            ->recent(compact('sort', 'withReplies'));
+
+        if (is_api_request()) {
+            return [
+                'forum' => json_item($forum, new ForumTransformer(), ['subforums.subforums']),
+                'topics' => json_collection($topics->limit(Topic::PER_PAGE)->get(), new TopicTransformer()),
+                'pinned_topics' => json_collection($pinnedTopics, new TopicTransformer()),
+            ];
+        }
+
+        $topics = $topics->paginate();
+
+        $lastTopics = Forum::lastTopics($forum);
 
         $allTopics = array_merge($pinnedTopics->all(), $topics->all());
         $topicReadStatus = TopicTrack::readStatus($user, $allTopics);
@@ -103,6 +171,11 @@ public function show($id)
                 ->get()
                 ->keyBy('topic_id');
 
+        $cover = json_item(
+            $forum->cover()->firstOrNew([]),
+            new ForumCoverTransformer()
+        );
+
         $noindex = !$forum->enable_indexing;
 
         set_opengraph($forum);

app/Http/Controllers/Forum/TopicsController.php

@@ -18,6 +18,7 @@
 use App\Models\Forum\TopicWatch;
 use App\Models\UserProfileCustomization;
 use App\Transformers\Forum\TopicCoverTransformer;
+use App\Transformers\Forum\TopicTransformer;
 use Auth;
 use DB;
 use Request;
@@ -50,7 +51,7 @@ public function __construct()
             'store',
         ]]);
 
-        $this->middleware('require-scopes:public', ['only' => ['show']]);
+        $this->middleware('require-scopes:public', ['only' => ['index', 'show']]);
         $this->middleware('require-scopes:forum.write', ['only' => ['reply', 'store', 'update']]);
     }
 
@@ -279,6 +280,60 @@ public function reply($id)
         }
     }
 
+    /**
+     * Get Topic Listing
+     *
+     * Get a sorted list of topics, optionally from a specific forum
+     *
+     * ---
+     *
+     * ### Response Format
+     *
+     * Field         | Type                          | Notes
+     * ------------- | ----------------------------- | -----
+     * topics        | [ForumTopic](#forum-topic)[]  | |
+     * cursor_string | [CursorString](#cursorstring) | |
+     *
+     * @usesCursor
+     * @queryParam forum_id Id of a specific forum to get topics from. No-example
+     * @queryParam sort Topic sorting option. Valid values are `new` (default) and `old`. Both sort by the topic's last post time. No-example
+     * @queryParam limit Maximum number of topics to be returned (50 at most and by default). No-example
+     *
+     * @response {
+     *   "topics": [
+     *     { "id": 1, "...": "..." },
+     *     { "id": 2, "...": "..." }
+     *   ],
+     *   "cursor_string": "eyJoZWxsbyI6IndvcmxkIn0"
+     * }
+     */
+    public function index()
+    {
+        $params = get_params(request()->all(), null, [
+            'limit:int',
+            'sort',
+            'forum_id:int',
+        ], ['null_missing' => true]);
+
+        $limit = \Number::clamp($params['limit'] ?? Topic::PER_PAGE, 1, Topic::PER_PAGE);
+        $cursorHelper = Topic::makeDbCursorHelper($params['sort']);
+
+        $topics = Topic::cursorSort($cursorHelper, cursor_from_params($params))
+            ->limit($limit);
+
+        $forum_id = $params['forum_id'];
+        if ($forum_id !== null) {
+            $topics->where('forum_id', $forum_id);
+        }
+
+        [$topics, $hasMore] = $topics->getWithHasMore();
+
+        return [
+            'topics' => json_collection($topics, new TopicTransformer()),
+            ...cursor_for_response($cursorHelper->next($topics, $hasMore)),
+        ];
+    }
+
     /**
      * Get Topic and Posts
      *

app/Models/Forum/Topic.php

@@ -13,6 +13,7 @@
 use App\Models\Beatmapset;
 use App\Models\Log;
 use App\Models\Notification;
+use App\Models\Traits\WithDbCursorHelper;
 use App\Models\User;
 use App\Traits\Memoizes;
 use App\Traits\Validatable;
@@ -78,8 +79,20 @@ class Topic extends Model implements AfterCommit
     use SoftDeletes {
         restore as private origRestore;
     }
+    use WithDbCursorHelper;
 
     const DEFAULT_SORT = 'new';
+    const SORTS = [
+        'new' => [
+            // type 'timestamp' because the values are stored as integer in the database
+            ['column' => 'topic_last_post_time', 'order' => 'DESC', 'type' => 'timestamp'],
+            ['column' => 'topic_last_post_id', 'order' => 'DESC'],
+        ],
+        'old' => [
+            ['column' => 'topic_last_post_time', 'order' => 'ASC', 'type' => 'timestamp'],
+            ['column' => 'topic_last_post_id', 'order' => 'ASC'],
+        ],
+    ];
 
     const STATUS_LOCKED = 1;
     const STATUS_UNLOCKED = 0;

app/Transformers/Forum/ForumTransformer.php

@@ -0,0 +1,34 @@
+<?php
+
+// Copyright (c) ppy Pty Ltd <[email protected]>. Licensed under the GNU Affero General Public License v3.0.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace App\Transformers\Forum;
+
+use App\Models\Forum\Forum;
+use App\Transformers\TransformerAbstract;
+use League\Fractal\Resource\ResourceInterface;
+
+class ForumTransformer extends TransformerAbstract
+{
+    protected array $availableIncludes = [
+        'subforums',
+    ];
+
+    public function transform(Forum $forum): array
+    {
+        return [
+            'id' => $forum->getKey(),
+            'name' => $forum->forum_name,
+            'description' => $forum->forum_desc,
+        ];
+    }
+
+    public function includeSubforums(Forum $forum): ResourceInterface
+    {
+        return $this->collection(
+            $forum->subforums,
+            new static()
+        );
+    }
+}

app/helpers.php

@@ -1608,6 +1608,8 @@ function get_param_value($input, $type)
             return get_arr($input, 'get_int');
         case 'time':
             return parse_time_to_carbon($input);
+        case 'timestamp':
+            return parse_time_to_timestamp($input);
         default:
             return presence(get_string($input));
     }
@@ -1746,6 +1748,11 @@ function parse_time_to_carbon($value)
     }
 }
 
+function parse_time_to_timestamp(mixed $value): ?int
+{
+    return parse_time_to_carbon($value)?->timestamp;
+}
+
 function format_duration_for_display(int $seconds)
 {
     return floor($seconds / 60).':'.str_pad((string) ($seconds % 60), 2, '0', STR_PAD_LEFT);

resources/views/docs/_structures/forum.md

@@ -0,0 +1,10 @@
+<div id="forum-object" data-unique="forum-object"></div>
+
+## Forum
+
+Field       | Type                      | Notes
+------------|---------------------------|-------
+id          | integer                   |
+name        | string                    |
+description | string                    |
+subforums   | [Forum](#forum-object)[]? | Maximum 2 layers of subforums from the top-level Forum

routes/web.php

@@ -478,9 +478,10 @@
         Route::group(['as' => 'forum.', 'namespace' => 'Forum'], function () {
             Route::group(['prefix' => 'forums'], function () {
                 Route::post('topics/{topic}/reply', 'TopicsController@reply')->name('topics.reply');
-                Route::resource('topics', 'TopicsController', ['only' => ['show', 'store', 'update']]);
+                Route::resource('topics', 'TopicsController', ['only' => ['index', 'show', 'store', 'update']]);
                 Route::resource('posts', 'PostsController', ['only' => ['update']]);
             });
+            Route::resource('forums', 'ForumsController', ['only' => ['index', 'show']]);
         });
         Route::resource('matches', 'MatchesController', ['only' => ['index', 'show']]);