177 lines
6.3 KiB
PHP
177 lines
6.3 KiB
PHP
<?php
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function sanitize($textToSanitize,
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$removedTags = array('script', 'iframe', 'input', 'form'),
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$keptAttributes = array('title', 'href', 'src'),
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$keptText = array()){
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$htmlContent = str_get_html($textToSanitize);
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foreach($htmlContent->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]') as $element) {
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if(in_array($element->tag, $keptText)) {
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$element->outertext = $element->plaintext;
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} elseif(in_array($element->tag, $removedTags)) {
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$element->outertext = '';
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} else {
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foreach($element->getAllAttributes() as $attributeName => $attribute) {
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if(!in_array($attributeName, $keptAttributes))
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$element->removeAttribute($attributeName);
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}
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}
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}
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return $htmlContent;
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}
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function backgroundToImg($htmlContent) {
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$regex = '/background-image[ ]{0,}:[ ]{0,}url\([\'"]{0,}(.*?)[\'"]{0,}\)/';
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$htmlContent = str_get_html($htmlContent);
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foreach($htmlContent->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]') as $element) {
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if(preg_match($regex, $element->style, $matches) > 0) {
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$element->outertext = '<img style="display:block;" src="' . $matches[1] . '" />';
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}
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}
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return $htmlContent;
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}
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/**
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* Convert relative links in HTML into absolute links
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* @param $content HTML content to fix. Supports HTML objects or string objects
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* @param $server full URL to the page containing relative links
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* @return content with fixed URLs, as HTML object or string depending on input type
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*/
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function defaultLinkTo($content, $server){
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$string_convert = false;
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if (is_string($content)) {
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$string_convert = true;
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$content = str_get_html($content);
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}
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foreach($content->find('img') as $image) {
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$image->src = urljoin($server, $image->src);
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}
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foreach($content->find('a') as $anchor) {
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$anchor->href = urljoin($server, $anchor->href);
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}
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if ($string_convert) {
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$content = $content->outertext;
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}
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return $content;
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}
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/**
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* Extract the first part of a string matching the specified start and end delimiters
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* @param $string input string, e.g. '<div>Post author: John Doe</div>'
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* @param $start start delimiter, e.g. 'author: '
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* @param $end end delimiter, e.g. '<'
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* @return extracted string, e.g. 'John Doe', or false if the delimiters were not found.
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*/
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function extractFromDelimiters($string, $start, $end) {
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if (strpos($string, $start) !== false) {
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$section_retrieved = substr($string, strpos($string, $start) + strlen($start));
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$section_retrieved = substr($section_retrieved, 0, strpos($section_retrieved, $end));
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return $section_retrieved;
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} return false;
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}
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/**
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* Remove one or more part(s) of a string using a start and end delmiters
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* @param $string input string, e.g. 'foo<script>superscript()</script>bar'
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* @param $start start delimiter, e.g. '<script'
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* @param $end end delimiter, e.g. '</script>'
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* @return cleaned string, e.g. 'foobar'
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*/
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function stripWithDelimiters($string, $start, $end) {
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while(strpos($string, $start) !== false) {
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$section_to_remove = substr($string, strpos($string, $start));
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$section_to_remove = substr($section_to_remove, 0, strpos($section_to_remove, $end) + strlen($end));
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$string = str_replace($section_to_remove, '', $string);
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}
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return $string;
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}
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/**
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* Remove HTML sections containing one or more sections using the same HTML tag
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* @param $string input string, e.g. 'foo<div class="ads"><div>ads</div>ads</div>bar'
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* @param $tag_name name of the HTML tag, e.g. 'div'
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* @param $tag_start start of the HTML tag to remove, e.g. '<div class="ads">'
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* @return cleaned string, e.g. 'foobar'
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*/
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function stripRecursiveHTMLSection($string, $tag_name, $tag_start){
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$open_tag = '<' . $tag_name;
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$close_tag = '</' . $tag_name . '>';
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$close_tag_length = strlen($close_tag);
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if(strpos($tag_start, $open_tag) === 0) {
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while(strpos($string, $tag_start) !== false) {
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$max_recursion = 100;
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$section_to_remove = null;
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$section_start = strpos($string, $tag_start);
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$search_offset = $section_start;
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do {
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$max_recursion--;
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$section_end = strpos($string, $close_tag, $search_offset);
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$search_offset = $section_end + $close_tag_length;
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$section_to_remove = substr($string, $section_start, $section_end - $section_start + $close_tag_length);
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$open_tag_count = substr_count($section_to_remove, $open_tag);
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$close_tag_count = substr_count($section_to_remove, $close_tag);
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} while ($open_tag_count > $close_tag_count && $max_recursion > 0);
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$string = str_replace($section_to_remove, '', $string);
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}
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}
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return $string;
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}
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/**
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* Convert Markdown tags into HTML tags. Only a subset of the Markdown syntax is implemented.
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* @param $string input string in Markdown format
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* @return output string in HTML format
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*/
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function markdownToHtml($string) {
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//For more details about how these regex work:
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// https://github.com/RSS-Bridge/rss-bridge/pull/802#discussion_r216138702
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// Images: https://regex101.com/r/JW9Evr/1
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// Links: https://regex101.com/r/eRGVe7/1
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// Bold: https://regex101.com/r/2p40Y0/1
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// Italic: https://regex101.com/r/xJkET9/1
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// Separator: https://regex101.com/r/ZBEqFP/1
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// Plain URL: https://regex101.com/r/2JHYwb/1
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// Site name: https://regex101.com/r/qIuKYE/1
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$string = preg_replace('/\!\[([^\]]+)\]\(([^\) ]+)(?: [^\)]+)?\)/', '<img src="$2" alt="$1" />', $string);
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$string = preg_replace('/\[([^\]]+)\]\(([^\)]+)\)/', '<a href="$2">$1</a>', $string);
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$string = preg_replace('/\*\*(.*)\*\*/U', '<b>$1</b>', $string);
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$string = preg_replace('/\*(.*)\*/U', '<i>$1</i>', $string);
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$string = preg_replace('/__(.*)__/U', '<b>$1</b>', $string);
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$string = preg_replace('/_(.*)_/U', '<i>$1</i>', $string);
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$string = preg_replace('/[-]{6,99}/', '<hr />', $string);
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$string = str_replace(' ', '<br />', $string);
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$string = preg_replace('/([^"])(https?:\/\/[^ "<]+)([^"])/', '$1<a href="$2">$2</a>$3', $string . ' ');
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$string = preg_replace('/([^"\/])(www\.[^ "<]+)([^"])/', '$1<a href="http://$2">$2</a>$3', $string . ' ');
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//As the regex are not perfect, we need to fix <i> and </i> that are introduced in URLs
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// Fixup regex <i>: https://regex101.com/r/NTRPf6/1
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// Fixup regex </i>: https://regex101.com/r/aNklRp/1
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$count = 1;
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while($count > 0) {
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$string = preg_replace('/ (src|href)="([^"]+)<i>([^"]+)"/U', ' $1="$2_$3"', $string, -1, $count);
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}
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$count = 1;
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while($count > 0) {
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$string = preg_replace('/ (src|href)="([^"]+)<\/i>([^"]+)"/U', ' $1="$2_$3"', $string, -1, $count);
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}
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return '<div>' . trim($string) . '</div>';
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}
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