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[html] Clarify meaning of strange find() parameter

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simple_html_dom currently doesnt support "->find('*')", which is a
known issue: https://sourceforge.net/p/simplehtmldom/bugs/157/

The solution implemented by RSS-Bridge is to find all nodes WITHOUT
a specific attribute. If the attribute is very unlikely to appear
in the DOM, this is essentially returning all nodes.

This is the meaning behind

"->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]')"
This commit is contained in:
logmanoriginal 2018-11-18 17:32:01 +01:00
parent 67004556e6
commit 54800fcc8d
1 changed files with 22 additions and 5 deletions
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27
lib/html.php
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@ -26,8 +26,6 @@
* already removes some of the tags (search for `remove_noise` in simple_html_dom.php).
* @todo Rename parameters to make more sense. `$textToSanitize` must be HTML,
* `$removedTags`, `$keptAttributes` and `$keptText` are past tense.
* @todo Clarify the meaning of `*[!b38fd2b1fe7f4747d6b1c1254ccd055e]`, which
* looks like a SHA1 hash (does simplehtmldom not support `find('*')`?).
*/
function sanitize($textToSanitize,
$removedTags = array('script', 'iframe', 'input', 'form'),
@ -35,6 +33,17 @@ $keptAttributes = array('title', 'href', 'src'),
$keptText = array()){
$htmlContent = str_get_html($textToSanitize);
/*
* Notice: simple_html_dom currently doesn't support "->find(*)", which is a
* known issue: https://sourceforge.net/p/simplehtmldom/bugs/157/
*
* A solution to this is to find all nodes WITHOUT a specific attribute. If
* the attribute is very unlikely to appear in the DOM, this is essentially
* returning all nodes.
*
* "*[!b38fd2b1fe7f4747d6b1c1254ccd055e]" is doing exactly that. The attrib
* "b38fd2b1fe7f4747d6b1c1254ccd055e" is very unlikely to appear in any DOM.
*/
foreach($htmlContent->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]') as $element) {
if(in_array($element->tag, $keptText)) {
$element->outertext = $element->plaintext;
@ -76,15 +85,23 @@ $keptText = array()){
*
* @param string $htmlContent The HTML content
* @return string The HTML content with all ocurrences replaced
*
* @todo Clarify the meaning of `*[!b38fd2b1fe7f4747d6b1c1254ccd055e]`, which
* looks like a SHA1 hash (does simplehtmldom not support `find('*')`?).
*/
function backgroundToImg($htmlContent) {
$regex = '/background-image[ ]{0,}:[ ]{0,}url\([\'"]{0,}(.*?)[\'"]{0,}\)/';
$htmlContent = str_get_html($htmlContent);
/*
* Notice: simple_html_dom currently doesn't support "->find(*)", which is a
* known issue: https://sourceforge.net/p/simplehtmldom/bugs/157/
*
* A solution to this is to find all nodes WITHOUT a specific attribute. If
* the attribute is very unlikely to appear in the DOM, this is essentially
* returning all nodes.
*
* "*[!b38fd2b1fe7f4747d6b1c1254ccd055e]" is doing exactly that. The attrib
* "b38fd2b1fe7f4747d6b1c1254ccd055e" is very unlikely to appear in any DOM.
*/
foreach($htmlContent->find('*[!b38fd2b1fe7f4747d6b1c1254ccd055e]') as $element) {
if(preg_match($regex, $element->style, $matches) > 0) {