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<?php |
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/** |
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* |
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* Topic Image Preview. An extension for the phpBB Forum Software package. |
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* |
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* @copyright (c) 2017, 2020, Matt Friedman |
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* @license GNU General Public License, version 2 (GPL-2.0) |
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* |
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*/ |
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namespace vse\topicimagepreview\event; |
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use phpbb\auth\auth; |
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use phpbb\config\config; |
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use phpbb\db\driver\driver_interface; |
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use phpbb\user; |
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/** |
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* Topic Image Preview Factory. |
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*/ |
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class helper |
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{ |
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/** @var auth */ |
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protected $auth; |
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/** @var config */ |
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protected $config; |
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/** @var driver_interface */ |
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protected $db; |
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/** @var user */ |
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protected $user; |
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/** @var bool */ |
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protected $preview = false; |
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/** |
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* Constructor |
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* |
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* @param auth $auth |
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* @param config $config |
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* @param driver_interface $db |
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* @param user $user |
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*/ |
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public function __construct(auth $auth, config $config, driver_interface $db, user $user) |
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{ |
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$this->auth = $auth; |
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$this->config = $config; |
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$this->db = $db; |
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$this->user = $user; |
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} |
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/** |
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* Get the value of the in_preview |
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* |
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* @return bool True if topic image previews are generated. |
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*/ |
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public function is_preview() |
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{ |
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return $this->preview; |
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} |
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/** |
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* Add post text containing images to topic row data. |
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* |
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* @param \phpbb\event\data $event The event object |
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* |
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* @return void |
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*/ |
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public function update_row_data($event) |
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{ |
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if (!$this->user_allowed()) |
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{ |
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return; |
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} |
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// Use topic_list from event, otherwise create one based on the rowset |
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$topic_list = $event->offsetExists('topic_list') ? $event['topic_list'] : array_keys($event['rowset']); |
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if (count($topic_list)) |
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{ |
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$event['rowset'] = $this->query_images($topic_list, $event['rowset']); |
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} |
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} |
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/** |
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* Add image previews to the template data. |
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* |
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* @param \phpbb\event\data $event The event object |
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* |
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* @return void |
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*/ |
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public function update_tpl_data($event) |
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{ |
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if (empty($event['row']['post_text']) || !$this->user_allowed() || !$this->forum_allowed($event['row']['forum_id'])) |
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{ |
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return; |
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} |
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// Send the image string to the template |
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$block = $event->offsetExists('topic_row') ? 'topic_row' : 'tpl_ary'; |
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$event[$block] = array_merge($event[$block], ['TOPIC_IMAGES' => $this->extract_images($event['row']['post_text'])]); |
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$this->preview = true; |
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} |
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/** |
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* Run an SQL query on a group of topics, and find the newest (or oldest) |
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* post with [IMG] images. Then update the topic's row set array to include |
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* the post's text in the cases where images were found. |
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* |
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* @param array $topic_list An array of topic ids |
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* @param array $rowset The row set of topic data |
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* |
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* @return array The updated row set of topic data which now includes |
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* the post_text of a post containing images. |
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*/ |
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protected function query_images(array $topic_list, array $rowset) |
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{ |
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$sql_array = []; |
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$direction = $this->config->offsetGet('vse_tip_new') ? 'DESC' : 'ASC'; |
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$like_expression = $this->db->sql_like_expression('<r>' . $this->db->get_any_char() . '<IMG ' . $this->db->get_any_char()); |
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$is_sqlite3 = $this->db->get_sql_layer() === 'sqlite3'; |
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$is_mssql = strpos($this->db->get_sql_layer(), 'mssql') === 0; |
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foreach ($topic_list as $topic_id) |
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{ |
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if (!$this->forum_allowed($rowset[$topic_id]['forum_id'])) |
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{ |
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continue; |
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} |
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$stmt = '(SELECT ' . ($is_mssql ? 'TOP 1 ' : '') . 'topic_id, post_text |
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FROM ' . POSTS_TABLE . ' |
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WHERE topic_id = ' . (int) $topic_id . ' |
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AND post_visibility = ' . ITEM_APPROVED . ' |
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AND post_text ' . $like_expression . ' |
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ORDER BY post_time ' . $direction . ($is_mssql ? '' : ' LIMIT 1') . ')'; |
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// SQLite3 and mssql don't like ORDER BY with UNION ALL, so treat $stmt as derived table |
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if ($is_sqlite3 || $is_mssql) |
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{ |
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$stmt = "SELECT * FROM $stmt AS d"; |
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} |
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$sql_array[] = $stmt; |
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} |
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if (count($sql_array)) |
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{ |
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$sql = implode(' UNION ALL ', $sql_array); |
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$result = $this->db->sql_query($sql); |
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while ($row = $this->db->sql_fetchrow($result)) |
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{ |
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$rowset[$row['topic_id']]['post_text'] = $row['post_text']; |
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} |
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$this->db->sql_freeresult($result); |
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} |
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return $rowset; |
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} |
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/** |
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* Extract images from a post and return them as an array of images. |
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* |
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* @param string $post Post text from the database. |
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* |
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* @return array An array of images. |
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*/ |
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protected function extract_images($post) |
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{ |
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// Extract the images |
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$images = []; |
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$dom = new \DOMDocument; |
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$dom->loadXML($post); |
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$xpath = new \DOMXPath($dom); |
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foreach ($xpath->query('//IMG[not(ancestor::IMG)]/@src') as $image) |
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{ |
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$images[] = $image->textContent; |
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} |
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return array_slice($images, 0, (int) $this->config['vse_tip_num'], true); |
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} |
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/** |
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* Is the forum allowed to show topic image previews |
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* |
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* @param int $forum_id Forum identifier |
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* @return bool True if allowed, false if not |
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*/ |
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protected function forum_allowed($forum_id) |
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{ |
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return (bool) $this->auth->acl_get('f_vse_tip', $forum_id); |
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} |
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/** |
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* Does the user allow topic image previews? |
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* |
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* @return bool True if allowed, false if not |
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*/ |
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protected function user_allowed() |
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{ |
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return (bool) $this->user->data['user_vse_tip']; |
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} |
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} |
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iMattPro /
TopicImagePreview
