library/HTMLPurifier/AttrTransform/ImgRequired.php

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<?php

// must be called POST validation

class HTMLPurifier_AttrTransform_ImgRequired extends HTMLPurifier_AttrTransform
{
    
    public function transform($attr, $config, $context) {
        
        $src = true;
        if (!isset($attr['src'])) {
            if ($config->get('Core', 'RemoveInvalidImg')) return $attr;
            $attr['src'] = $config->get('Attr', 'DefaultInvalidImage');
            $src = false;
        }
        
        if (!isset($attr['alt'])) {
            if ($src) {
                $attr['alt'] = basename($attr['src']);
            } else {
                $attr['alt'] = $config->get('Attr', 'DefaultInvalidImageAlt');
            }
        }
        
        return $attr;
        
    }
    
}

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