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Shortcodes: Improve the reliablity of shortcodes inside HTML tags.
Merge of [33359] to the 3.7 branch. Props miqrogroove. See #15694. Built from https://develop.svn.wordpress.org/branches/3.7@33389 git-svn-id: http://core.svn.wordpress.org/branches/3.7@33357 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast
parent
8a6a7d323e
commit
fa946535d7
@ -57,7 +57,7 @@ class WP_Embed {
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add_shortcode( 'embed', array( $this, 'shortcode' ) );
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// Do the shortcode (only the [embed] one is registered)
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$content = do_shortcode( $content );
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$content = do_shortcode( $content, true );
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// Put the original shortcodes back
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$shortcode_tags = $orig_shortcode_tags;
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@ -280,6 +280,10 @@ class WP_Embed {
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* @return string Potentially modified $content.
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*/
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function autoembed( $content ) {
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// Strip newlines from all elements.
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$content = wp_replace_in_html_tags( $content, array( "\n" => " " ) );
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// Find URLs that are on their own line.
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return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array( $this, 'autoembed_callback' ), $content );
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}
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@ -233,6 +233,10 @@ function wpautop($pee, $br = true) {
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$pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);
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$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);
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$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines
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// Strip newlines from all elements.
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$pee = wp_replace_in_html_tags( $pee, array( "\n" => " " ) );
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if ( strpos($pee, '<object') !== false ) {
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$pee = preg_replace('|\s*<param([^>]*)>\s*|', "<param$1>", $pee); // no pee inside object/embed
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$pee = preg_replace('|\s*</embed>\s*|', '</embed>', $pee);
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@ -266,6 +270,74 @@ function wpautop($pee, $br = true) {
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return $pee;
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}
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/**
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* Replace characters or phrases within HTML elements only.
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*
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* @since 4.2.3
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*
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* @param string $haystack The text which has to be formatted.
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* @param array $replace_pairs In the form array('from' => 'to', ...).
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* @return string The formatted text.
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*/
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function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
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// Find all elements.
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$comments =
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'!' // Start of comment, after the <.
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. '(?:' // Unroll the loop: Consume everything until --> is found.
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. '-(?!->)' // Dash not followed by end of comment.
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. '[^\-]*+' // Consume non-dashes.
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. ')*+' // Loop possessively.
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. '(?:-->)?'; // End of comment. If not found, match all input.
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$regex =
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'/(' // Capture the entire match.
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. '<' // Find start of element.
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. '(?(?=!--)' // Is this a comment?
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. $comments // Find end of comment.
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. '|'
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. '[^>]*>?' // Find end of element. If not found, match all input.
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. ')'
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. ')/s';
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$textarr = preg_split( $regex, $haystack, -1, PREG_SPLIT_DELIM_CAPTURE );
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$changed = false;
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// Optimize when searching for one item.
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if ( 1 === count( $replace_pairs ) ) {
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// Extract $needle and $replace.
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foreach ( $replace_pairs as $needle => $replace );
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// Loop through delimeters (elements) only.
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for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
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if ( false !== strpos( $textarr[$i], $needle ) ) {
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$textarr[$i] = str_replace( $needle, $replace, $textarr[$i] );
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$changed = true;
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}
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}
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} else {
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// Extract all $needles.
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$needles = array_keys( $replace_pairs );
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// Loop through delimeters (elements) only.
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for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
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foreach ( $needles as $needle ) {
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if ( false !== strpos( $textarr[$i], $needle ) ) {
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$textarr[$i] = strtr( $textarr[$i], $replace_pairs );
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$changed = true;
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// After one strtr() break out of the foreach loop and look at next element.
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break;
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}
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}
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}
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}
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if ( $changed ) {
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$haystack = implode( $textarr );
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}
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return $haystack;
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}
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/**
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* Newline preservation help function for wpautop
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*
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@ -484,6 +484,82 @@ function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {
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return wp_kses_split($string, $allowed_html, $allowed_protocols);
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}
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/**
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* Filters one attribute only and ensures its value is allowed.
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*
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* This function has the advantage of being more secure than esc_attr() and can
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* escape data in some situations where wp_kses() must strip the whole attribute.
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*
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* @since 4.2.3
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*
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* @param string $string The 'whole' attribute, including name and value.
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* @param string $element The element name to which the attribute belongs.
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* @return string Filtered attribute.
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*/
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function wp_kses_one_attr( $string, $element ) {
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$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');
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$allowed_html = wp_kses_allowed_html( 'post' );
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$allowed_protocols = wp_allowed_protocols();
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$string = wp_kses_no_null( $string, array( 'slash_zero' => 'keep' ) );
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$string = wp_kses_js_entities( $string );
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$string = wp_kses_normalize_entities( $string );
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// Preserve leading and trailing whitespace.
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$matches = array();
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preg_match('/^\s*/', $string, $matches);
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$lead = $matches[0];
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preg_match('/\s*$/', $string, $matches);
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$trail = $matches[0];
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if ( empty( $trail ) ) {
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$string = substr( $string, strlen( $lead ) );
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} else {
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$string = substr( $string, strlen( $lead ), -strlen( $trail ) );
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}
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// Parse attribute name and value from input.
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$split = preg_split( '/\s*=\s*/', $string, 2 );
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$name = $split[0];
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if ( count( $split ) == 2 ) {
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$value = $split[1];
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// Remove quotes surrounding $value.
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// Also guarantee correct quoting in $string for this one attribute.
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if ( '' == $value ) {
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$quote = '';
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} else {
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$quote = $value[0];
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}
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if ( '"' == $quote || "'" == $quote ) {
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if ( substr( $value, -1 ) != $quote ) {
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return '';
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}
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$value = substr( $value, 1, -1 );
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} else {
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$quote = '"';
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}
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// Sanitize quotes and angle braces.
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$value = htmlspecialchars( $value, ENT_QUOTES, null, false );
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// Sanitize URI values.
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if ( in_array( strtolower( $name ), $uris ) ) {
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$value = wp_kses_bad_protocol( $value, $allowed_protocols );
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}
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$string = "$name=$quote$value$quote";
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$vless = 'n';
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} else {
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$value = '';
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$vless = 'y';
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}
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// Sanitize attribute by name.
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wp_kses_attr_check( $name, $value, $string, $vless, $element, $allowed_html );
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// Restore whitespace.
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return $lead . $string . $trail;
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}
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/**
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* Return a list of allowed tags and attributes for a given context.
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*
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@ -681,45 +757,11 @@ function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
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# Go through $attrarr, and save the allowed attributes for this element
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# in $attr2
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$attr2 = '';
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$allowed_attr = $allowed_html[strtolower($element)];
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foreach ($attrarr as $arreach) {
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if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) )
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continue; # the attribute is not allowed
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$current = $allowed_attr[strtolower($arreach['name'])];
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if ( $current == '' )
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continue; # the attribute is not allowed
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if ( strtolower( $arreach['name'] ) == 'style' ) {
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$orig_value = $arreach['value'];
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$value = safecss_filter_attr( $orig_value );
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if ( empty( $value ) )
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continue;
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$arreach['value'] = $value;
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$arreach['whole'] = str_replace( $orig_value, $value, $arreach['whole'] );
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}
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if ( ! is_array($current) ) {
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foreach ( $attrarr as $arreach ) {
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if ( wp_kses_attr_check( $arreach['name'], $arreach['value'], $arreach['whole'], $arreach['vless'], $element, $allowed_html ) ) {
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$attr2 .= ' '.$arreach['whole'];
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# there are no checks
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} else {
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# there are some checks
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$ok = true;
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foreach ($current as $currkey => $currval) {
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if ( ! wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval) ) {
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$ok = false;
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break;
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}
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}
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if ( $ok )
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$attr2 .= ' '.$arreach['whole']; # it passed them
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} # if !is_array($current)
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} # foreach
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}
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}
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# Remove any "<" or ">" characters
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$attr2 = preg_replace('/[<>]/', '', $attr2);
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@ -727,6 +769,53 @@ function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {
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return "<$element$attr2$xhtml_slash>";
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}
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/**
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* Determine whether an attribute is allowed.
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*
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* @since 4.2.3
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*
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* @param string $name The attribute name. Returns empty string when not allowed.
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* @param string $value The attribute value. Returns a filtered value.
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* @param string $whole The name=value input. Returns filtered input.
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* @param string $vless 'y' when attribute like "enabled", otherwise 'n'.
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* @param string $element The name of the element to which this attribute belongs.
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* @param array $allowed_html The full list of allowed elements and attributes.
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* @return bool Is the attribute allowed?
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*/
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function wp_kses_attr_check( &$name, &$value, &$whole, $vless, $element, $allowed_html ) {
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$allowed_attr = $allowed_html[strtolower( $element )];
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$name_low = strtolower( $name );
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if ( ! isset( $allowed_attr[$name_low] ) || '' == $allowed_attr[$name_low] ) {
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$name = $value = $whole = '';
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return false;
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}
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if ( 'style' == $name_low ) {
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$new_value = safecss_filter_attr( $value );
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if ( empty( $new_value ) ) {
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$name = $value = $whole = '';
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return false;
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}
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$whole = str_replace( $value, $new_value, $whole );
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$value = $new_value;
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}
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if ( is_array( $allowed_attr[$name_low] ) ) {
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// there are some checks
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foreach ( $allowed_attr[$name_low] as $currkey => $currval ) {
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if ( ! wp_kses_check_attr_val( $value, $vless, $currkey, $currval ) ) {
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$name = $value = $whole = '';
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return false;
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}
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}
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}
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return true;
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}
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/**
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* Builds an attribute list from string containing attributes.
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*
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@ -856,6 +945,109 @@ function wp_kses_hair($attr, $allowed_protocols) {
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return $attrarr;
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}
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/**
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* Finds all attributes of an HTML element.
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*
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* Does not modify input. May return "evil" output.
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*
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* Based on wp_kses_split2() and wp_kses_attr()
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*
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* @since 4.2.3
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*
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* @param string $element HTML element/tag
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* @return array|bool List of attributes found in $element. Returns false on failure.
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*/
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function wp_kses_attr_parse( $element ) {
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$valid = preg_match('%^(<\s*)(/\s*)?([a-zA-Z0-9]+\s*)([^>]*)(>?)$%', $element, $matches);
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if ( 1 !== $valid ) {
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return false;
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}
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$begin = $matches[1];
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$slash = $matches[2];
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$elname = $matches[3];
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$attr = $matches[4];
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$end = $matches[5];
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if ( '' !== $slash ) {
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// Closing elements do not get parsed.
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return false;
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}
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// Is there a closing XHTML slash at the end of the attributes?
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if ( 1 === preg_match( '%\s*/\s*$%', $attr, $matches ) ) {
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$xhtml_slash = $matches[0];
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$attr = substr( $attr, 0, -strlen( $xhtml_slash ) );
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} else {
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$xhtml_slash = '';
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}
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// Split it
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$attrarr = wp_kses_hair_parse( $attr );
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if ( false === $attrarr ) {
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return false;
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}
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// Make sure all input is returned by adding front and back matter.
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array_unshift( $attrarr, $begin . $slash . $elname );
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array_push( $attrarr, $xhtml_slash . $end );
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return $attrarr;
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}
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/**
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* Builds an attribute list from string containing attributes.
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*
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* Does not modify input. May return "evil" output.
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* In case of unexpected input, returns false instead of stripping things.
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*
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* Based on wp_kses_hair() but does not return a multi-dimensional array.
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*
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* @since 4.2.3
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*
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* @param string $attr Attribute list from HTML element to closing HTML element tag
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* @return array|bool List of attributes found in $attr. Returns false on failure.
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*/
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function wp_kses_hair_parse( $attr ) {
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if ( '' === $attr ) {
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return array();
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}
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$regex =
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'(?:'
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. '[-a-zA-Z:]+' // Attribute name.
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. '|'
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. '\[\[?[^\[\]]+\]\]?' // Shortcode in the name position implies unfiltered_html.
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. ')'
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. '(?:' // Attribute value.
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. '\s*=\s*' // All values begin with '='
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. '(?:'
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. '"[^"]*"' // Double-quoted
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. '|'
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. "'[^']*'" // Single-quoted
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. '|'
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. '[^\s"\']+' // Non-quoted
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. '(?:\s|$)' // Must have a space
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. ')'
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. '|'
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. '(?:\s|$)' // If attribute has no value, space is required.
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. ')'
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. '\s*'; // Trailing space is optional except as mentioned above.
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// Although it is possible to reduce this procedure to a single regexp,
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// we must run that regexp twice to get exactly the expected result.
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$validation = "%^($regex)+$%";
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$extraction = "%$regex%";
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if ( 1 === preg_match( $validation, $attr ) ) {
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preg_match_all( $extraction, $attr, $attrarr );
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return $attrarr[0];
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} else {
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return false;
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}
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}
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/**
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* Performs different checks for attribute values.
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*
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@ -176,16 +176,37 @@ function has_shortcode( $content, $tag ) {
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* @uses get_shortcode_regex() Gets the search pattern for searching shortcodes.
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*
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* @param string $content Content to search for shortcodes
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* @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
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* @return string Content with shortcodes filtered out.
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*/
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function do_shortcode($content) {
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function do_shortcode( $content, $ignore_html = false ) {
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global $shortcode_tags;
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if ( false === strpos( $content, '[' ) ) {
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return $content;
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}
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if (empty($shortcode_tags) || !is_array($shortcode_tags))
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return $content;
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$tagnames = array_keys($shortcode_tags);
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$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
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$pattern = "/\\[($tagregexp)/s";
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if ( 1 !== preg_match( $pattern, $content ) ) {
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// Avoids parsing HTML when there are no shortcodes or embeds anyway.
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return $content;
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}
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$content = do_shortcodes_in_html_tags( $content, $ignore_html );
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$pattern = get_shortcode_regex();
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return preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
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$content = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
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// Always restore square braces so we don't break things like <!--[if IE ]>
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$content = unescape_invalid_shortcodes( $content );
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return $content;
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}
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/**
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@ -277,6 +298,141 @@ function do_shortcode_tag( $m ) {
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}
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}
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/**
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* Search only inside HTML elements for shortcodes and process them.
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*
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* Any [ or ] characters remaining inside elements will be HTML encoded
|
||||
* to prevent interference with shortcodes that are outside the elements.
|
||||
* Assumes $content processed by KSES already. Users with unfiltered_html
|
||||
* capability may get unexpected output if angle braces are nested in tags.
|
||||
*
|
||||
* @since 4.2.3
|
||||
*
|
||||
* @param string $content Content to search for shortcodes
|
||||
* @param bool $ignore_html When true, all square braces inside elements will be encoded.
|
||||
* @return string Content with shortcodes filtered out.
|
||||
*/
|
||||
function do_shortcodes_in_html_tags( $content, $ignore_html ) {
|
||||
// Normalize entities in unfiltered HTML before adding placeholders.
|
||||
$trans = array( '[' => '[', ']' => ']' );
|
||||
$content = strtr( $content, $trans );
|
||||
$trans = array( '[' => '[', ']' => ']' );
|
||||
|
||||
$pattern = get_shortcode_regex();
|
||||
|
||||
$comment_regex =
|
||||
'!' // Start of comment, after the <.
|
||||
. '(?:' // Unroll the loop: Consume everything until --> is found.
|
||||
. '-(?!->)' // Dash not followed by end of comment.
|
||||
. '[^\-]*+' // Consume non-dashes.
|
||||
. ')*+' // Loop possessively.
|
||||
. '(?:-->)?'; // End of comment. If not found, match all input.
|
||||
|
||||
$regex =
|
||||
'/(' // Capture the entire match.
|
||||
. '<' // Find start of element.
|
||||
. '(?(?=!--)' // Is this a comment?
|
||||
. $comment_regex // Find end of comment.
|
||||
. '|'
|
||||
. '[^>]*>?' // Find end of element. If not found, match all input.
|
||||
. ')'
|
||||
. ')/s';
|
||||
|
||||
$textarr = preg_split( $regex, $content, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
|
||||
|
||||
foreach ( $textarr as &$element ) {
|
||||
if ( '<' !== $element[0] ) {
|
||||
continue;
|
||||
}
|
||||
|
||||
$noopen = false === strpos( $element, '[' );
|
||||
$noclose = false === strpos( $element, ']' );
|
||||
if ( $noopen || $noclose ) {
|
||||
// This element does not contain shortcodes.
|
||||
if ( $noopen xor $noclose ) {
|
||||
// Need to encode stray [ or ] chars.
|
||||
$element = strtr( $element, $trans );
|
||||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
if ( $ignore_html || '<!--' === substr( $element, 0, 4 ) ) {
|
||||
// Encode all [ and ] chars.
|
||||
$element = strtr( $element, $trans );
|
||||
continue;
|
||||
}
|
||||
|
||||
$attributes = wp_kses_attr_parse( $element );
|
||||
if ( false === $attributes ) {
|
||||
// Looks like we found some crazy unfiltered HTML. Skipping it for sanity.
|
||||
$element = strtr( $element, $trans );
|
||||
continue;
|
||||
}
|
||||
|
||||
// Get element name
|
||||
$front = array_shift( $attributes );
|
||||
$back = array_pop( $attributes );
|
||||
$matches = array();
|
||||
preg_match('%[a-zA-Z0-9]+%', $front, $matches);
|
||||
$elname = $matches[0];
|
||||
|
||||
// Look for shortcodes in each attribute separately.
|
||||
foreach ( $attributes as &$attr ) {
|
||||
$open = strpos( $attr, '[' );
|
||||
$close = strpos( $attr, ']' );
|
||||
if ( false === $open || false === $close ) {
|
||||
continue; // Go to next attribute. Square braces will be escaped at end of loop.
|
||||
}
|
||||
$double = strpos( $attr, '"' );
|
||||
$single = strpos( $attr, "'" );
|
||||
if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
|
||||
// $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
|
||||
// In this specific situation we assume KSES did not run because the input
|
||||
// was written by an administrator, so we should avoid changing the output
|
||||
// and we do not need to run KSES here.
|
||||
$attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr );
|
||||
} else {
|
||||
// $attr like 'name = "[shortcode]"' or "name = '[shortcode]'"
|
||||
// We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
|
||||
$count = 0;
|
||||
$new_attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr, -1, $count );
|
||||
if ( $count > 0 ) {
|
||||
// Sanitize the shortcode output using KSES.
|
||||
$new_attr = wp_kses_one_attr( $new_attr, $elname );
|
||||
if ( '' !== $new_attr ) {
|
||||
// The shortcode is safe to use now.
|
||||
$attr = $new_attr;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
$element = $front . implode( '', $attributes ) . $back;
|
||||
|
||||
// Now encode any remaining [ or ] chars.
|
||||
$element = strtr( $element, $trans );
|
||||
}
|
||||
|
||||
$content = implode( '', $textarr );
|
||||
|
||||
return $content;
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove placeholders added by do_shortcodes_in_html_tags().
|
||||
*
|
||||
* @since 4.2.3
|
||||
*
|
||||
* @param string $content Content to search for placeholders.
|
||||
* @return string Content with placeholders removed.
|
||||
*/
|
||||
function unescape_invalid_shortcodes( $content ) {
|
||||
// Clean up entire string, avoids re-parsing HTML.
|
||||
$trans = array( '[' => '[', ']' => ']' );
|
||||
$content = strtr( $content, $trans );
|
||||
|
||||
return $content;
|
||||
}
|
||||
|
||||
/**
|
||||
* Retrieve all attributes from the shortcodes tag.
|
||||
*
|
||||
@ -371,9 +527,15 @@ function strip_shortcodes( $content ) {
|
||||
if (empty($shortcode_tags) || !is_array($shortcode_tags))
|
||||
return $content;
|
||||
|
||||
$pattern = get_shortcode_regex();
|
||||
$content = do_shortcodes_in_html_tags( $content, true );
|
||||
|
||||
return preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
|
||||
$pattern = get_shortcode_regex();
|
||||
$content = preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
|
||||
|
||||
// Always restore square braces so we don't break things like <!--[if IE ]>
|
||||
$content = unescape_invalid_shortcodes( $content );
|
||||
|
||||
return $content;
|
||||
}
|
||||
|
||||
function strip_shortcode_tag( $m ) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user