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Fix discharge mPDF rendering for malformed HTML

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Normalize malformed discharge summary HTML before passing it to mPDF so browser-tolerated markup does not break PDF output.
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DevSoftTech Server 2026-07-15 21:11:53 +05:30
parent bdae843f0a
commit 8270c8a049
1 changed files with 104 additions and 0 deletions
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104
app/Controllers/Ipd_discharge.php
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@ -7047,9 +7047,113 @@ class Ipd_discharge extends BaseController
$out = (string) preg_replace('/\bheader\s*:\s*html[_a-z0-9-]+\s*;?/i', '', $out);
$out = (string) preg_replace('/\bfooter\s*:\s*html[_a-z0-9-]+\s*;?/i', '', $out);
if ($this->looksLikeMalformedDischargeHtml($out)) {
$out = $this->normalizeMalformedDischargeHtmlForMpdf($out);
}
return $this->forceValidUtf8($out);
}
private function looksLikeMalformedDischargeHtml(string $html): bool
{
if ($html === '') {
return false;
}
if (preg_match('/<p\b[^>]*>\s*<(?:div|table|h[1-6]|ul|ol|p)\b/i', $html) === 1) {
return true;
}
if (preg_match('/<(?!\/?(?:[a-z][a-z0-9:_-]*)(?:\s|\/?>)|!--|\?xml|!doctype)/i', $html) === 1) {
return true;
}
return preg_match('/<\/(?:p|div|span|strong|em|i|b)>\s*<\/(?:p|div)>/i', $html) === 1;
}
private function normalizeMalformedDischargeHtmlForMpdf(string $html): string
{
if ($html === '') {
return '';
}
$html = $this->escapeInvalidAngleBrackets($html);
if (! class_exists('DOMDocument')) {
return $html;
}
$previousUseInternalErrors = libxml_use_internal_errors(true);
libxml_clear_errors();
try {
$dom = new \DOMDocument('1.0', 'UTF-8');
$flags = 0;
if (defined('LIBXML_NOWARNING')) {
$flags |= LIBXML_NOWARNING;
}
if (defined('LIBXML_NOERROR')) {
$flags |= LIBXML_NOERROR;
}
if (defined('LIBXML_COMPACT')) {
$flags |= LIBXML_COMPACT;
}
$wrappedHtml = '<!DOCTYPE html><html><head><meta charset="utf-8"></head><body><div id="__discharge_pdf_root__">'
. $html
. '</div></body></html>';
$loaded = $dom->loadHTML('<?xml encoding="utf-8" ?>' . $wrappedHtml, $flags);
if ($loaded !== true) {
return $html;
}
$normalized = '';
$styleBlocks = [];
$styleNodes = $dom->getElementsByTagName('style');
foreach ($styleNodes as $styleNode) {
if (($styleNode->parentNode->nodeName ?? '') !== 'head') {
continue;
}
$styleHtml = trim((string) $dom->saveHTML($styleNode));
if ($styleHtml !== '') {
$styleBlocks[$styleHtml] = $styleHtml;
}
}
$root = $dom->getElementById('__discharge_pdf_root__');
if ($root instanceof \DOMElement) {
foreach ($root->childNodes as $childNode) {
$normalized .= (string) $dom->saveHTML($childNode);
}
}
if ($normalized === '') {
return $html;
}
return implode('', $styleBlocks) . $normalized;
} finally {
libxml_clear_errors();
libxml_use_internal_errors($previousUseInternalErrors);
}
}
private function escapeInvalidAngleBrackets(string $html): string
{
if ($html === '') {
return '';
}
return (string) preg_replace(
'/<(?!\/?(?:[a-z][a-z0-9:_-]*)(?:\s|\/?>)|!--|\?xml|!doctype)/i',
'&lt;',
$html
);
}
private function sanitizeCKEditorSpecialChars(string $html): string
{
if ($html === '') {