Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @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 searchAndAppendToBody(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;
}
$data = self::queryUrl($url);
if (!$data) {
return $body;
}
return self::appendDataToBody($body, $data, $no_photos);
}
/**
* @param string $body
* @param array $data
* @param bool $no_photos
* @return string
* @throws HTTPException\InternalServerErrorException
*/
public static function appendDataToBody(string $body, array $data, bool $no_photos = false)
{
// Only one [attachment] tag per body is allowed
$existingAttachmentPos = strpos($body, '[attachment');
if ($existingAttachmentPos !== false) {
$linkTitle = $data['title'] ?: $data['url'];
// Additional link attachments are prepended before the existing [attachment] tag
$body = substr_replace($body, "\n[bookmark=" . $data['url'] . ']' . $linkTitle . "[/bookmark]\n", $existingAttachmentPos, 0);
} else {
$footer = self::getFooterFromData($data, $no_photos);
$body = self::stripTrailingUrlFromBody($body, $data['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
$text = "[attachment";
foreach (['type', 'url', 'title', 'alternative_title', 'publisher_name', 'publisher_url', 'publisher_img', 'author_name', 'author_url', 'author_img'] as $field) {
if (!empty($data[$field])) {
$text .= " " . $field . "='" . str_replace(['[', ']'], ['&#91;', '&#93;'], htmlentities($data[$field], ENT_QUOTES, 'UTF-8', false)) . "'";
}
}
if (empty($data['text'])) {
$data['text'] = '';
}
// Only embedd a picture link when it seems to be a valid picture ("width" is set)
if (!empty($data['images']) && !empty($data['images'][0]['width'])) {
$preview = str_replace(['[', ']'], ['&#91;', '&#93;'], htmlentities($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='" . $preview . "'";
if (empty($data['text'])) {
$data['text'] = $data['title'];
}
if (empty($data['text'])) {
$data['text'] = $data['url'];
}
}
}
$text .= ']' . str_replace(['[', ']'], ['&#91;', '&#93;'], $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);
if ($photo != '') {
$data['images'][0]['src'] = $photo;
}
if (!$keywords) {
unset($data['keywords']);
} elseif ($keyword_denylist && !empty($data['keywords'])) {
$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, $keyword_denylist);
if (empty($data['keywords'])) {
return [];
}
$taglist = [];
foreach ($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
*/
public 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);
// Remove all hashtags and mentions
$body = preg_replace("/([#@!])\[url\=(.*?)\](.*?)\[\/url\]/ism", '', $body);
// Search for pure links
preg_match("/\[url\](.*?)\[\/url\]/ism", $body, $matches);
if (!$matches) {
// Search for links with descriptions
preg_match("/\[url\=(.*?)\].*?\[\/url\]/ism", $body, $matches);
}
if (!$matches && $searchNakedUrls) {
preg_match(Strings::autoLinkRegEx(), $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 or a shortened version of it.
*
* @param string $body
* @param string $url
* @return string
*/
protected static function stripTrailingUrlFromBody(string $body, string $url)
{
$quotedUrl = preg_quote($url, '#');
$body = preg_replace_callback("#(?:
\[url]$quotedUrl\[/url]|
\[url=$quotedUrl]$quotedUrl\[/url]|
\[url=$quotedUrl]([^[]*?)\[/url]|
$quotedUrl
)$#isx", function ($match) use ($url) {
// Stripping URLs with no label
if (empty($match[1])) {
return '';
}
// Stripping link labels that include a shortened version of the URL
$trimMatch = trim($match[1], '.…');
if (!empty($trimMatch) && strpos($url, $trimMatch) !== false) {
return '';
}
// Keep all other labels
return $match[1];
}, $body);
return rtrim($body);
}
}