+<?php
+/**
+ * @copyright Copyright (C) 2020, Friendica
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Content;
+
+use Friendica\Core\Hook;
+use Friendica\Core\Logger;
+use Friendica\DI;
+use Friendica\Network\HTTPException;
+use Friendica\Util\ParseUrl;
+use Friendica\Util\Strings;
+
+/**
+ * Extracts trailing URLs from post bodies to transform them in enriched attachment tags through Site Info query
+ */
+class PageInfo
+{
+ /**
+ * @param string $body
+ * @param bool $searchNakedUrls
+ * @param bool $no_photos
+ * @return string
+ * @throws HTTPException\InternalServerErrorException
+ */
+ public static function appendToBody(string $body, bool $searchNakedUrls = false, bool $no_photos = false)
+ {
+ Logger::info('add_page_info_to_body: fetch page info for body', ['body' => $body]);
+
+ $url = self::getRelevantUrlFromBody($body, $searchNakedUrls);
+ if (!$url) {
+ return $body;
+ }
+
+ $footer = self::getFooterFromUrl($url, $no_photos);
+ if (!$footer) {
+ return $body;
+ }
+
+ $body = self::stripTrailingUrlFromBody($body, $url);
+
+ $body .= "\n" . $footer;
+
+ return $body;
+ }
+
+ /**
+ * @param string $url
+ * @param bool $no_photos
+ * @param string $photo
+ * @param bool $keywords
+ * @param string $keyword_denylist
+ * @return string
+ * @throws HTTPException\InternalServerErrorException
+ */
+ public static function getFooterFromUrl(string $url, bool $no_photos = false, string $photo = '', bool $keywords = false, string $keyword_denylist = '')
+ {
+ $data = self::queryUrl($url, $photo, $keywords, $keyword_denylist);
+
+ return self::getFooterFromData($data, $no_photos);
+ }
+
+ /**
+ * @param array $data
+ * @param bool $no_photos
+ * @return string
+ * @throws HTTPException\InternalServerErrorException
+ */
+ public static function getFooterFromData(array $data, bool $no_photos = false)
+ {
+ Hook::callAll('page_info_data', $data);
+
+ if (empty($data['type'])) {
+ return '';
+ }
+
+ // It maybe is a rich content, but if it does have everything that a link has,
+ // then treat it that way
+ if (($data['type'] == 'rich') && is_string($data['title']) &&
+ is_string($data['text']) && !empty($data['images'])) {
+ $data['type'] = 'link';
+ }
+
+ $data['title'] = $data['title'] ?? '';
+
+ if ((($data['type'] != 'link') && ($data['type'] != 'video') && ($data['type'] != 'photo')) || ($data['title'] == $data['url'])) {
+ return '';
+ }
+
+ if ($no_photos && ($data['type'] == 'photo')) {
+ return '';
+ }
+
+ // Escape some bad characters
+ $data['url'] = str_replace(['[', ']'], ['[', ']'], htmlentities($data['url'], ENT_QUOTES, 'UTF-8', false));
+ $data['title'] = str_replace(['[', ']'], ['[', ']'], htmlentities($data['title'], ENT_QUOTES, 'UTF-8', false));
+
+ $text = "[attachment type='" . $data['type'] . "'";
+
+ if (empty($data['text'])) {
+ $data['text'] = $data['title'];
+ }
+
+ if (empty($data['text'])) {
+ $data['text'] = $data['url'];
+ }
+
+ if (!empty($data['url'])) {
+ $text .= " url='" . $data['url'] . "'";
+ }
+
+ if (!empty($data['title'])) {
+ $text .= " title='" . $data['title'] . "'";
+ }
+
+ // Only embedd a picture link when it seems to be a valid picture ("width" is set)
+ if (!empty($data['images']) && !empty($data['images'][0]['width'])) {
+ $preview = str_replace(['[', ']'], ['[', ']'], htmlentities($data['images'][0]['src'], ENT_QUOTES, 'UTF-8', false));
+ // if the preview picture is larger than 500 pixels then show it in a larger mode
+ // But only, if the picture isn't higher than large (To prevent huge posts)
+ if (!DI::config()->get('system', 'always_show_preview') && ($data['images'][0]['width'] >= 500)
+ && ($data['images'][0]['width'] >= $data['images'][0]['height'])) {
+ $text .= " image='" . $preview . "'";
+ } else {
+ $text .= " preview='" . $preview . "'";
+ }
+ }
+
+ $text .= ']' . $data['text'] . '[/attachment]';
+
+ $hashtags = '';
+ if (!empty($data['keywords'])) {
+ $hashtags = "\n";
+ foreach ($data['keywords'] as $keyword) {
+ /// @TODO make a positive list of allowed characters
+ $hashtag = str_replace([' ', '+', '/', '.', '#', '@', "'", '"', '’', '`', '(', ')', '„', '“'], '', $keyword);
+ $hashtags .= '#[url=' . DI::baseUrl() . '/search?tag=' . $hashtag . ']' . $hashtag . '[/url] ';
+ }
+ }
+
+ return $text . $hashtags;
+ }
+
+ /**
+ * @param string $url
+ * @param string $photo
+ * @param bool $keywords
+ * @param string $keyword_denylist
+ * @return array|bool
+ * @throws HTTPException\InternalServerErrorException
+ */
+ public static function queryUrl(string $url, string $photo = '', bool $keywords = false, string $keyword_denylist = '')
+ {
+ $data = ParseUrl::getSiteinfoCached($url, true);
+
+ if ($photo != '') {
+ $data['images'][0]['src'] = $photo;
+ }
+
+ if (!$keywords) {
+ unset($data['keywords']);
+ } elseif ($keyword_denylist) {
+ $list = explode(', ', $keyword_denylist);
+
+ foreach ($list as $keyword) {
+ $keyword = trim($keyword);
+
+ $index = array_search($keyword, $data['keywords']);
+ if ($index !== false) {
+ unset($data['keywords'][$index]);
+ }
+ }
+ }
+
+ Logger::info('fetch page info for URL', ['url' => $url, 'data' => $data]);
+
+ return $data;
+ }
+
+ /**
+ * @param string $url
+ * @param string $photo
+ * @param string $keyword_denylist
+ * @return array
+ * @throws HTTPException\InternalServerErrorException
+ */
+ public static function getTagsFromUrl(string $url, string $photo = '', string $keyword_denylist = '')
+ {
+ $data = self::queryUrl($url, $photo, true, $keyword_denylist);
+
+ $taglist = [];
+ foreach ($data['keywords'] as $keyword) {
+ $hashtag = str_replace([' ', '+', '/', '.', '#', "'"],
+ ['', '', '', '', '', ''], $keyword);
+
+ $taglist[] = $hashtag;
+ }
+
+ return $taglist;
+ }
+
+ /**
+ * Picks a non-hashtag, non-mention, schemeful URL at the end of the provided body string to be converted into Page Info.
+ *
+ * @param string $body
+ * @param bool $searchNakedUrls Whether we should pick a naked URL (outside of BBCode tags) as a last resort
+ * @return string|null
+ */
+ protected static function getRelevantUrlFromBody(string $body, bool $searchNakedUrls = false)
+ {
+ $URLSearchString = 'https?://[^\[\]]*';
+
+ // Fix for Mastodon where the mentions are in a different format
+ $body = preg_replace("~\[url=($URLSearchString)]([#!@])(.*?)\[/url]~is", '$2[url=$1]$3[/url]', $body);
+
+ preg_match("~(?<![!#@])\[url]($URLSearchString)\[/url]$~is", $body, $matches);
+
+ if (!$matches) {
+ preg_match("~(?<![!#@])\[url=($URLSearchString)].*\[/url]$~is", $body, $matches);
+ }
+
+ if (!$matches && $searchNakedUrls) {
+ preg_match('~(?<=\W|^)(?<![=\]])(https?://.+)$~is', $body, $matches);
+ if ($matches && !Strings::endsWith($body, $matches[1])) {
+ unset($matches);
+ }
+ }
+
+ return $matches[1] ?? null;
+ }
+
+ /**
+ * Remove the provided URL from the body if it is at the end of it.
+ * Keep the link label if it isn't the full URL.
+ *
+ * @param string $body
+ * @param string $url
+ * @return string|string[]|null
+ */
+ protected static function stripTrailingUrlFromBody(string $body, string $url)
+ {
+ $quotedUrl = preg_quote($url, '#');
+ $body = preg_replace("#(?:
+ \[url]$quotedUrl\[/url]|
+ \[url=$quotedUrl]$quotedUrl\[/url]|
+ \[url=$quotedUrl]([^[]*?)\[/url]|
+ $quotedUrl
+ )$#isx", '$1', $body);
+
+ return $body;
+ }
+}
projects / friendica.git / commitdiff