mirror of https://github.com/friendica/friendica
140 lines
4.4 KiB
PHP
140 lines
4.4 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Content\Text;
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use Friendica\Core\System;
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use Friendica\DI;
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use Friendica\Model\Contact;
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/**
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* Friendica-specific usage of Markdown
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*/
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class Markdown
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{
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/**
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* Converts a Markdown string into HTML. The hardwrap parameter maximizes
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* compatibility with Diaspora in spite of the Markdown standard.
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*
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* @param string $text
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* @param bool $hardwrap
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* @return string
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* @throws \Exception
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*/
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public static function convert($text, $hardwrap = true) {
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$stamp1 = microtime(true);
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$MarkdownParser = new MarkdownParser();
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$MarkdownParser->code_class_prefix = 'language-';
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$MarkdownParser->hard_wrap = $hardwrap;
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$MarkdownParser->hashtag_protection = true;
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$MarkdownParser->url_filter_func = function ($url) {
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if (strpos($url, '#') === 0) {
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$url = ltrim($_SERVER['REQUEST_URI'], '/') . $url;
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}
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return $url;
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};
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$text = self::convertDiasporaMentionsToHtml($text);
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$html = $MarkdownParser->transform($text);
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DI::profiler()->saveTimestamp($stamp1, "parser", System::callstack());
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return $html;
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}
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/**
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* Replace Diaspora-style mentions in a text since they trip the Markdown parser autolinker.
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*
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* @param string $text
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* @return string
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*/
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private static function convertDiasporaMentionsToHtml(string $text)
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{
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return preg_replace_callback(
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'/([@!]){(?:([^}]+?); ?)?([^} ]+)}/',
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/*
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* Matching values for the callback
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* [1] = mention type (@ or !)
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* [2] = name (optional)
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* [3] = profile URL
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*/
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function ($matches) {
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if ($matches[3] == '') {
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return '';
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}
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$data = Contact::getDetailsByAddr($matches[3]);
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if (empty($data)) {
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return '';
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}
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$name = $matches[2];
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if ($name == '') {
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$name = $data['name'];
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}
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return $matches[1] . '<a href="' . $data['url'] . '">' . $name . '</a>';
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},
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$text
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);
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}
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/*
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* we don't want to support a bbcode specific markdown interpreter
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* and the markdown library we have is pretty good, but provides HTML output.
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* So we'll use that to convert to HTML, then convert the HTML back to bbcode,
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* and then clean up a few Diaspora specific constructs.
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*/
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public static function toBBCode($s)
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{
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// The parser cannot handle paragraphs correctly
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$s = str_replace(['</p>', '<p>', '<p dir="ltr">'], ['<br>', '<br>', '<br>'], $s);
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// Escaping hashtags that could be titles
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$s = preg_replace('/^\#([^\s\#])/im', '\#$1', $s);
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$s = self::convert($s);
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$s = HTML::toBBCode($s);
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// protect the recycle symbol from turning into a tag, but without unescaping angles and naked ampersands
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$s = str_replace('♲', html_entity_decode('♲', ENT_QUOTES, 'UTF-8'), $s);
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//$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)(vimeo|youtu|www\.youtube|soundcloud)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,]+)/ism", '$1[url=$2$3$4]$2$3$4[/url]',$s);
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$s = BBCode::pregReplaceInTag('/\[url\=?(.*?)\]https?:\/\/www.youtube.com\/watch\?v\=(.*?)\[\/url\]/ism', '[youtube]$2[/youtube]', 'url', $s);
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$s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/www.youtube.com\/watch\?v\=(.*?)\].*?\[\/url\]/ism' , '[youtube]$1[/youtube]', 'url', $s);
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$s = BBCode::pregReplaceInTag('/\[url\=?(.*?)\]https?:\/\/vimeo.com\/([0-9]+)(.*?)\[\/url\]/ism' , '[vimeo]$2[/vimeo]' , 'url', $s);
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$s = BBCode::pregReplaceInTag('/\[url\=https?:\/\/vimeo.com\/([0-9]+)\](.*?)\[\/url\]/ism' , '[vimeo]$1[/vimeo]' , 'url', $s);
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// remove duplicate adjacent code tags
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$s = preg_replace('/(\[code\])+(.*?)(\[\/code\])+/ism', '[code]$2[/code]', $s);
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// Don't show link to full picture (until it is fixed)
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$s = BBCode::scaleExternalImages($s);
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return $s;
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}
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}
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