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https://github.com/renbaoshuo/S2OJ.git
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49 lines
1.4 KiB
PHP
49 lines
1.4 KiB
PHP
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<?php
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// must be called POST validation
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/**
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* Transform that supplies default values for the src and alt attributes
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* in img tags, as well as prevents the img tag from being removed
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* because of a missing alt tag. This needs to be registered as both
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* a pre and post attribute transform.
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*/
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class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
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{
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/**
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* @param array $attr
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* @param HTMLPurifier_Config $config
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* @param HTMLPurifier_Context $context
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* @return array
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*/
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public function transform($attr, $config, $context)
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{
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$src = true;
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if (!isset($attr['src'])) {
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if ($config->get('Core.RemoveInvalidImg')) {
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return $attr;
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}
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$attr['src'] = $config->get('Attr.DefaultInvalidImage');
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$src = false;
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}
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if (!isset($attr['alt'])) {
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if ($src) {
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$alt = $config->get('Attr.DefaultImageAlt');
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if ($alt === null) {
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// truncate if the alt is too long
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$attr['alt'] = substr(basename($attr['src']), 0, 40);
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} else {
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$attr['alt'] = $alt;
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}
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} else {
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$attr['alt'] = $config->get('Attr.DefaultInvalidImageAlt');
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}
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}
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return $attr;
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}
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}
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// vim: et sw=4 sts=4
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