/**
* @param string $sHtml
* @param bool $bHasExternals = false
* @param array $aFoundCIDs = array()
* @param array $aContentLocationUrls = array()
* @param array $aFoundedContentLocationUrls = array()
* @param bool $bDoNotReplaceExternalUrl = false
* @param bool $bFindLinksInHtml = false
* @param callback|null $fAdditionalExternalFilter = null
* @param callback|null $fAdditionalDomReader = null
*
* @return string
*/
public static function ClearHtml($sHtml, &$bHasExternals = false, &$aFoundCIDs = array(), $aContentLocationUrls = array(), &$aFoundedContentLocationUrls = array(), $bDoNotReplaceExternalUrl = false, $bFindLinksInHtml = false, $fAdditionalExternalFilter = null, $fAdditionalDomReader = false, $bTryToDetectHiddenImages = false)
{
$sResult = '';
$sHtml = null === $sHtml ? '' : (string) $sHtml;
$sHtml = \trim($sHtml);
if (0 === \strlen($sHtml)) {
return '';
}
if ($fAdditionalExternalFilter && !\is_callable($fAdditionalExternalFilter)) {
$fAdditionalExternalFilter = null;
}
if ($fAdditionalDomReader && !\is_callable($fAdditionalDomReader)) {
$fAdditionalDomReader = null;
}
$bHasExternals = false;
$sHtml = \MailSo\Base\HtmlUtils::FixSchemas($sHtml);
$sHtml = \MailSo\Base\HtmlUtils::ClearTags($sHtml, false);
$sHtml = \MailSo\Base\HtmlUtils::ClearOn($sHtml);
$sHtmlAttrs = $sBodyAttrs = '';
$sHtml = \MailSo\Base\HtmlUtils::ClearBodyAndHtmlTag($sHtml, $sHtmlAttrs, $sBodyAttrs);
// Dom Part
$oDom = \MailSo\Base\HtmlUtils::GetDomFromText($sHtml, $sHtmlAttrs, $sBodyAttrs);
unset($sHtml);
if ($oDom) {
if ($fAdditionalDomReader) {
$oResDom = \call_user_func($fAdditionalDomReader, $oDom);
if ($oResDom) {
$oDom = $oResDom;
}
unset($oResDom);
}
if ($bFindLinksInHtml) {
\MailSo\Base\HtmlUtils::FindLinksInDOM($oDom);
}
$oXpath = new \DOMXpath($oDom);
$oComments = $oXpath->query('//comment()');
if ($oComments) {
foreach ($oComments as $oComment) {
if (isset($oComment->parentNode)) {
@$oComment->parentNode->removeChild($oComment);
}
}
}
unset($oXpath, $oComments);
$aNodes = $oDom->getElementsByTagName('*');
foreach ($aNodes as $oElement) {
if ($oElement) {
$sTagNameLower = \strtolower($oElement->tagName);
if ('' !== $sTagNameLower && \in_array($sTagNameLower, array('svg', 'head', 'link', 'base', 'meta', 'title', 'style', 'x-script', 'script', 'bgsound', 'keygen', 'source', 'object', 'embed', 'applet', 'mocha', 'iframe', 'frame', 'frameset', 'video', 'audio', 'area', 'map'))) {
if (isset($oElement->parentNode)) {
@$oElement->parentNode->removeChild($oElement);
}
}
}
}
$sLinkColor = '';
$aNodes = $oDom->getElementsByTagName('*');
foreach ($aNodes as $oElement) {
$sTagNameLower = \strtolower($oElement->tagName);
// convert body attributes to styles
if ('body' === $sTagNameLower) {
$aAttrs = array('link' => '', 'text' => '', 'topmargin' => '', 'leftmargin' => '', 'bottommargin' => '', 'rightmargin' => '');
if (isset($oElement->attributes)) {
foreach ($oElement->attributes as $sAttributeName => $oAttributeNode) {
if ($oAttributeNode && isset($oAttributeNode->nodeValue)) {
$sAttributeNameLower = \strtolower($sAttributeName);
if (isset($aAttrs[$sAttributeNameLower]) && '' === $aAttrs[$sAttributeNameLower]) {
$aAttrs[$sAttributeNameLower] = array($sAttributeName, \trim($oAttributeNode->nodeValue));
}
}
}
}
$aStyles = array();
foreach ($aAttrs as $sIndex => $aItem) {
if (\is_array($aItem)) {
$oElement->removeAttribute($aItem[0]);
switch ($sIndex) {
case 'link':
$sLinkColor = \trim($aItem[1]);
if (!\preg_match('/^#[abcdef0-9]{3,6}$/i', $sLinkColor)) {
$sLinkColor = '';
}
break;
case 'text':
$aStyles[] = 'color: ' . $aItem[1];
break;
case 'topmargin':
$aStyles[] = 'margin-top: ' . (int) $aItem[1] . 'px';
break;
case 'leftmargin':
$aStyles[] = 'margin-left: ' . (int) $aItem[1] . 'px';
break;
case 'bottommargin':
$aStyles[] = 'margin-bottom: ' . (int) $aItem[1] . 'px';
break;
case 'rightmargin':
$aStyles[] = 'margin-right: ' . (int) $aItem[1] . 'px';
break;
}
}
}
if (0 < \count($aStyles)) {
$sStyles = $oElement->hasAttribute('style') ? \trim(\trim(\trim($oElement->getAttribute('style')), ';')) : '';
$oElement->setAttribute('style', (empty($sStyles) ? '' : $sStyles . '; ') . \implode('; ', $aStyles));
}
}
if ('iframe' === $sTagNameLower || 'frame' === $sTagNameLower) {
$oElement->setAttribute('src', 'javascript:false');
}
if ('a' === $sTagNameLower && !empty($sLinkColor)) {
$sStyles = $oElement->hasAttribute('style') ? \trim(\trim(\trim($oElement->getAttribute('style')), ';')) : '';
$oElement->setAttribute('style', 'color: ' . $sLinkColor . \trim(empty($sStyles) ? '' : '; ' . $sStyles));
}
if (\in_array($sTagNameLower, array('a', 'form', 'area'))) {
$oElement->setAttribute('target', '_blank');
}
if (\in_array($sTagNameLower, array('a', 'form', 'area', 'input', 'button', 'textarea'))) {
$oElement->setAttribute('tabindex', '-1');
}
foreach (array('id', 'class', 'contenteditable', 'designmode', 'formaction', 'data-bind', 'data-reactid', 'xmlns', 'srcset', 'data-x-skip-style') as $sAttr) {
@$oElement->removeAttribute($sAttr);
}
foreach (array('load', 'blur', 'error', 'focus', 'formchange', 'change', 'click', 'dblclick', 'keydown', 'keypress', 'keyup', 'mousedown', 'mouseenter', 'mouseleave', 'mousemove', 'mouseout', 'mouseover', 'mouseup', 'move', 'resize', 'resizeend', 'resizestart', 'scroll', 'select', 'submit', 'upload') as $sAttr) {
@$oElement->removeAttribute('on' . $sAttr);
}
if ($oElement->hasAttribute('href')) {
$sHref = \trim($oElement->getAttribute('href'));
if (!\preg_match('/^(http[s]?|ftp|skype|mailto):/i', $sHref) && '//' !== \substr($sHref, 0, 2)) {
$oElement->setAttribute('data-x-broken-href', $sHref);
$oElement->setAttribute('href', 'javascript:false');
}
if ('a' === $sTagNameLower) {
$oElement->setAttribute('rel', 'external nofollow');
}
}
if ($bTryToDetectHiddenImages && 'img' === $sTagNameLower) {
$sAlt = $oElement->hasAttribute('alt') ? \trim($oElement->getAttribute('alt')) : '';
if ($oElement->hasAttribute('src') && '' === $sAlt) {
$aH = array('email.microsoftemail.com/open', 'github.com/notifications/beacon/', 'mandrillapp.com/track/open', 'list-manage.com/track/open');
$sH = $oElement->hasAttribute('height') ? \trim($oElement->getAttribute('height')) : '';
// $sW = $oElement->hasAttribute('width')
// ? \trim($oElement->getAttribute('width')) : '';
$sStyles = $oElement->hasAttribute('style') ? \preg_replace('/[\\s]+/', '', \trim(\trim(\trim($oElement->getAttribute('style')), ';'))) : '';
$sSrc = \trim($oElement->getAttribute('src'));
$bC = \in_array($sH, array('1', '0', '1px', '0px')) || \preg_match('/(display:none|visibility:hidden|height:0|height:[01][a-z][a-z])/i', $sStyles);
if (!$bC) {
$sSrcLower = \strtolower($sSrc);
foreach ($aH as $sLine) {
if (false !== \strpos($sSrcLower, $sLine)) {
$bC = true;
break;
}
}
}
if ($bC) {
$oElement->setAttribute('style', 'display:none');
$oElement->setAttribute('data-x-skip-style', 'true');
$oElement->setAttribute('data-x-hidden-src', $sSrc);
$oElement->removeAttribute('src');
}
}
}
if ($oElement->hasAttribute('src')) {
$sSrc = \trim($oElement->getAttribute('src'));
$oElement->removeAttribute('src');
if (\in_array($sSrc, $aContentLocationUrls)) {
$oElement->setAttribute('data-x-src-location', $sSrc);
$aFoundedContentLocationUrls[] = $sSrc;
} else {
if ('cid:' === \strtolower(\substr($sSrc, 0, 4))) {
$oElement->setAttribute('data-x-src-cid', \substr($sSrc, 4));
$aFoundCIDs[] = \substr($sSrc, 4);
} else {
if (\preg_match('/^http[s]?:\\/\\//i', $sSrc) || '//' === \substr($sSrc, 0, 2)) {
if ($bDoNotReplaceExternalUrl) {
$oElement->setAttribute('src', $sSrc);
} else {
$oElement->setAttribute('data-x-src', $sSrc);
if ($fAdditionalExternalFilter) {
$sCallResult = \call_user_func($fAdditionalExternalFilter, $sSrc);
if (0 < \strlen($sCallResult)) {
$oElement->setAttribute('data-x-additional-src', $sCallResult);
}
}
}
$bHasExternals = true;
} else {
if ('data:image/' === \strtolower(\substr($sSrc, 0, 11))) {
$oElement->setAttribute('src', $sSrc);
} else {
$oElement->setAttribute('data-x-broken-src', $sSrc);
}
}
}
}
}
$sBackground = $oElement->hasAttribute('background') ? \trim($oElement->getAttribute('background')) : '';
$sBackgroundColor = $oElement->hasAttribute('bgcolor') ? \trim($oElement->getAttribute('bgcolor')) : '';
if (!empty($sBackground) || !empty($sBackgroundColor)) {
$aStyles = array();
$sStyles = $oElement->hasAttribute('style') ? \trim(\trim(\trim($oElement->getAttribute('style')), ';')) : '';
if (!empty($sBackground)) {
$aStyles[] = 'background-image: url(\'' . $sBackground . '\')';
$oElement->removeAttribute('background');
}
if (!empty($sBackgroundColor)) {
$aStyles[] = 'background-color: ' . $sBackgroundColor;
$oElement->removeAttribute('bgcolor');
}
$oElement->setAttribute('style', (empty($sStyles) ? '' : $sStyles . '; ') . \implode('; ', $aStyles));
}
if ($oElement->hasAttribute('style') && !$oElement->hasAttribute('data-x-skip-style')) {
$oElement->setAttribute('style', \MailSo\Base\HtmlUtils::ClearStyle($oElement->getAttribute('style'), $oElement, $bHasExternals, $aFoundCIDs, $aContentLocationUrls, $aFoundedContentLocationUrls, $bDoNotReplaceExternalUrl, $fAdditionalExternalFilter));
}
$oElement->removeAttribute('data-x-skip-style');
}
$sResult = $oDom->saveHTML();
}
unset($oDom);
$sResult = \MailSo\Base\HtmlUtils::ClearTags($sResult);
$sHtmlAttrs = $sBodyAttrs = '';
$sResult = \MailSo\Base\HtmlUtils::ClearBodyAndHtmlTag($sResult, $sHtmlAttrs, $sBodyAttrs);
$sResult = '<div data-x-div-type="body" ' . $sBodyAttrs . '>' . $sResult . '</div>';
$sResult = '<div data-x-div-type="html" ' . $sHtmlAttrs . '>' . $sResult . '</div>';
$sResult = \str_replace(\MailSo\Base\HtmlUtils::$KOS, ':', $sResult);
$sResult = \MailSo\Base\Utils::StripSpaces($sResult);
return \trim($sResult);
}
