Rss-Bridge/lib/html.php
ORelio de8cee6a1c Catching up | [Main] Debug mode, parse utils, MIME | [Bridges] Add/Improve 20 bridges (#802)
* Debug mode improvements

 - Improve debug warning message
 - Restore error reporting in debug mode
 - Fix 'notice' messages for unset fields

* Add parsing utility functions

html.php
 - extractFromDelimiters
 - stripWithDelimiters
 - stripRecursiveHTMLSection
 - markdownToHtml (partial)

bridges
 - remove now-duplicate functions
 - call functions from html.php instead

* [Anidex] New bridge

Anime torrent tracker

* [Anime-Ultime] Restore thumbnail

* [CNET] Recreate bridge

Full rewrite as the previous one was broken

* [Dilbert] Minor URI fix

Use new self::URI property

* [EstCeQuonMetEnProd] Fix content extraction

Bridge was broken

* [Facebook] Fix "SpSonsSoriSsés" label

... which was taking space in item title

* [Futura-Sciences] Use HTTPS, More cleanup

Use HTTPS as FS now offer HTTPS
Clean additional useless HTML elements

* [GBATemp] Multiple fixes

- Fix categories: missing "break" statements
- Restore thumbnail as enclosure
- Fix date extraction
- Fix user blog post extraction
- Use getSimpleHTMLDOMCached

* [JapanExpo] Fix bridge, HTTPS, thumbnails

- Fix getSimpleHTMLDOMCached call
- Upgrade to HTTPS as JE now offers HTTPS
- Restore thumbnails as enclosures

* [LeMondeInformatique] Fix bridge, HTTPS

- Upgrade to HTTPS as LMI now offers HTTPS
- Restore thumbnails using small images
- Fix content extraction
- Fix text encoding issue

* [Nextgov] Fix content extraction

- Restore thumbnail and use small image
- Field extraction fixes

* [NextInpact] Add categories and filtering by type

- Offer all RSS feeds
- Allow filtering by article type
- Implement extraction for brief articles
- Remove article limit, many brief articles are publied all at once

* [NyaaTorrents] New bridge

Anime torrent tracker

* [Releases3DS] Cache content, restore thumbnail

- Use getSimpleHTMLDOMCached
- Restore thumbnail as enclosure

* [TheHackerNews] Fix bridge

 - Fix content extraction including article body
 - Restore thumbnail as enclosure

* [WeLiveSecurity] HTTPS, Fix content extraction

- Upgrade to HTTPS as WLS now offers HTTPS
- Fix content extraction including article body

* [WordPress] Reduce timeout, more content selectors

- Reduce timeout to use default one (1h)
- Add new content selector (articleBody)
- Find thumbnail and set as enclosure
- Fix <script> cleanup

* [YGGTorrent] Increase limit, use cache

- Increase item limit as uploads are very frequent
- Use getSimpleHTMLDOMCached

* [ZDNet] Rewrite with FeedExpander

- Upgrade to HTTPS as ZD now offers HTTPS
- Use FeedExpander for secondary fields
- Fix content extraction for article body

* [Main] Handle MIME type for enclosures

Many feed readers will ignore enclosures (e.g. thumbnails) with no MIME type. This commit adds automatic MIME type detection based on file extension (which may be inaccurate but is the only way without fetching the content).

One can force enclosure type using #.ext anchor (hacky, needs improving)

* [FeedExpander] Improve field extraction

- Add support for passing enclosures
- Improve author and uri extraction
- Fix 'notice' PHP error messages

* [Pull] Coding style fixes for #802

* [Pull] Implementing changes for #802

 - Fix coding style issues with str append
 - Remove useless CACHE_TIMEOUT
 - Use count() instead of $limit
 - Use defaultLinkTo() + handle strings
 - Use http_build_query()
 - Fix missing </em>
 - Remove error_reporting(0)
 - warning CSS (@LogMANOriginal)
 - Fix typo in FeedExpander comment

* [Main] More documentation for markdownToHtml

See #802 for more details
2018-09-09 20:20:13 +01:00

176 lines
6.3 KiB
PHP

<?php
function sanitize($textToSanitize,
$removedTags = array('script', 'iframe', 'input', 'form'),
$keptAttributes = array('title', 'href', 'src'),
$keptText = array()){
$htmlContent = str_get_html($textToSanitize);
foreach($htmlContent->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]') as $element) {
if(in_array($element->tag, $keptText)) {
$element->outertext = $element->plaintext;
} elseif(in_array($element->tag, $removedTags)) {
$element->outertext = '';
} else {
foreach($element->getAllAttributes() as $attributeName => $attribute) {
if(!in_array($attributeName, $keptAttributes))
$element->removeAttribute($attributeName);
}
}
}
return $htmlContent;
}
function backgroundToImg($htmlContent) {
$regex = '/background-image[ ]{0,}:[ ]{0,}url\([\'"]{0,}(.*?)[\'"]{0,}\)/';
$htmlContent = str_get_html($htmlContent);
foreach($htmlContent->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]') as $element) {
if(preg_match($regex, $element->style, $matches) > 0) {
$element->outertext = '<img style="display:block;" src="' . $matches[1] . '" />';
}
}
return $htmlContent;
}
/**
* Convert relative links in HTML into absolute links
* @param $content HTML content to fix. Supports HTML objects or string objects
* @param $server full URL to the page containing relative links
* @return content with fixed URLs, as HTML object or string depending on input type
*/
function defaultLinkTo($content, $server){
$string_convert = false;
if (is_string($content)) {
$string_convert = true;
$content = str_get_html($content);
}
foreach($content->find('img') as $image) {
$image->src = urljoin($server, $image->src);
}
foreach($content->find('a') as $anchor) {
$anchor->href = urljoin($server, $anchor->href);
}
if ($string_convert) {
$content = $content->outertext;
}
return $content;
}
/**
* Extract the first part of a string matching the specified start and end delimiters
* @param $string input string, e.g. '<div>Post author: John Doe</div>'
* @param $start start delimiter, e.g. 'author: '
* @param $end end delimiter, e.g. '<'
* @return extracted string, e.g. 'John Doe', or false if the delimiters were not found.
*/
function extractFromDelimiters($string, $start, $end) {
if (strpos($string, $start) !== false) {
$section_retrieved = substr($string, strpos($string, $start) + strlen($start));
$section_retrieved = substr($section_retrieved, 0, strpos($section_retrieved, $end));
return $section_retrieved;
} return false;
}
/**
* Remove one or more part(s) of a string using a start and end delmiters
* @param $string input string, e.g. 'foo<script>superscript()</script>bar'
* @param $start start delimiter, e.g. '<script'
* @param $end end delimiter, e.g. '</script>'
* @return cleaned string, e.g. 'foobar'
*/
function stripWithDelimiters($string, $start, $end) {
while(strpos($string, $start) !== false) {
$section_to_remove = substr($string, strpos($string, $start));
$section_to_remove = substr($section_to_remove, 0, strpos($section_to_remove, $end) + strlen($end));
$string = str_replace($section_to_remove, '', $string);
}
return $string;
}
/**
* Remove HTML sections containing one or more sections using the same HTML tag
* @param $string input string, e.g. 'foo<div class="ads"><div>ads</div>ads</div>bar'
* @param $tag_name name of the HTML tag, e.g. 'div'
* @param $tag_start start of the HTML tag to remove, e.g. '<div class="ads">'
* @return cleaned string, e.g. 'foobar'
*/
function stripRecursiveHTMLSection($string, $tag_name, $tag_start){
$open_tag = '<' . $tag_name;
$close_tag = '</' . $tag_name . '>';
$close_tag_length = strlen($close_tag);
if(strpos($tag_start, $open_tag) === 0) {
while(strpos($string, $tag_start) !== false) {
$max_recursion = 100;
$section_to_remove = null;
$section_start = strpos($string, $tag_start);
$search_offset = $section_start;
do {
$max_recursion--;
$section_end = strpos($string, $close_tag, $search_offset);
$search_offset = $section_end + $close_tag_length;
$section_to_remove = substr($string, $section_start, $section_end - $section_start + $close_tag_length);
$open_tag_count = substr_count($section_to_remove, $open_tag);
$close_tag_count = substr_count($section_to_remove, $close_tag);
} while ($open_tag_count > $close_tag_count && $max_recursion > 0);
$string = str_replace($section_to_remove, '', $string);
}
}
return $string;
}
/**
* Convert Markdown tags into HTML tags. Only a subset of the Markdown syntax is implemented.
* @param $string input string in Markdown format
* @return output string in HTML format
*/
function markdownToHtml($string) {
//For more details about how these regex work:
// https://github.com/RSS-Bridge/rss-bridge/pull/802#discussion_r216138702
// Images: https://regex101.com/r/JW9Evr/1
// Links: https://regex101.com/r/eRGVe7/1
// Bold: https://regex101.com/r/2p40Y0/1
// Italic: https://regex101.com/r/xJkET9/1
// Separator: https://regex101.com/r/ZBEqFP/1
// Plain URL: https://regex101.com/r/2JHYwb/1
// Site name: https://regex101.com/r/qIuKYE/1
$string = preg_replace('/\!\[([^\]]+)\]\(([^\) ]+)(?: [^\)]+)?\)/', '<img src="$2" alt="$1" />', $string);
$string = preg_replace('/\[([^\]]+)\]\(([^\)]+)\)/', '<a href="$2">$1</a>', $string);
$string = preg_replace('/\*\*(.*)\*\*/U', '<b>$1</b>', $string);
$string = preg_replace('/\*(.*)\*/U', '<i>$1</i>', $string);
$string = preg_replace('/__(.*)__/U', '<b>$1</b>', $string);
$string = preg_replace('/_(.*)_/U', '<i>$1</i>', $string);
$string = preg_replace('/[-]{6,99}/', '<hr />', $string);
$string = str_replace('&#10;', '<br />', $string);
$string = preg_replace('/([^"])(https?:\/\/[^ "<]+)([^"])/', '$1<a href="$2">$2</a>$3', $string.' ');
$string = preg_replace('/([^"\/])(www\.[^ "<]+)([^"])/', '$1<a href="http://$2">$2</a>$3', $string.' ');
//As the regex are not perfect, we need to fix <i> and </i> that are introduced in URLs
// Fixup regex <i>: https://regex101.com/r/NTRPf6/1
// Fixup regex </i>: https://regex101.com/r/aNklRp/1
$count = 1;
while($count > 0) {
$string = preg_replace('/ (src|href)="([^"]+)<i>([^"]+)"/U', ' $1="$2_$3"', $string, -1, $count);
}
$count = 1;
while($count > 0) {
$string = preg_replace('/ (src|href)="([^"]+)<\/i>([^"]+)"/U', ' $1="$2_$3"', $string, -1, $count);
}
return '<div>' . trim($string) . '</div>';
}