Add user activity system

src/Api/Actions/Posts/GetsPosts.php

@@ -0,0 +1,30 @@
+<?php namespace Flarum\Api\Actions\Posts;
+
+use Flarum\Core\Models\User;
+use Flarum\Api\Actions\ApiParams;
+
+trait GetsPosts
+{
+	protected function getPosts(ApiParams $params, $where)
+	{
+		$sort = $params->sort(['time']);
+        $count = $params->count(20, 50);
+        $user = $this->actor->getUser();
+
+        if (isset($where['discussion_id']) && ($near = $params->get('near')) > 1) {
+            $start = $this->posts->getIndexForNumber($where['discussion_id'], $near, $user);
+            $start = max(0, $start - $count / 2);
+        } else {
+            $start = 0;
+        }
+
+        return $this->posts->findWhere(
+            $where,
+            $user,
+            $sort['field'],
+            $sort['order'] ?: 'asc',
+            $count,
+            $start
+        );
+	}
+}