HTML sanitizer for MediaWiki. More...

Static Public Member Functions
static	armorFrenchSpaces (string $text, string $space=' ')
	Armor French spaces with a replacement character.

static	checkCss ( $value)
	Pick apart some CSS and check it for forbidden or unsafe structures.

static	cleanUrl (string $url)

static	decodeCharReferences (string $text)
	Decode any character references, numeric or named entities, in the text and return a UTF-8 string.

static	decodeCharReferencesAndNormalize (string $text)
	Decode any character references, numeric or named entities, in the next and normalize the resulting string.

static	decodeTagAttributes (string $text)
	Return an associative array of attribute names and values from a partial tag string.

static	encodeAttribute (string $text)
	Encode an attribute value for HTML output.

static	escapeClass (string $class)
	Given a value, escape it so that it can be used as a CSS class and return it.

static	escapeCombiningChar (string $html)

static	escapeHtmlAllowEntities (string $html)
	Given HTML input, escape with htmlspecialchars but un-escape entities.

static	escapeIdForAttribute (string $id, int $mode=self::ID_PRIMARY)
	Given a section name or other user-generated or otherwise unsafe string, escapes it to be a valid HTML id attribute.

static	escapeIdForExternalInterwiki (string $id)
	Given a section name or other user-generated or otherwise unsafe string, escapes it to be a valid URL fragment for external interwikis.

static	escapeIdForLink (string $id)
	Given a section name or other user-generated or otherwise unsafe string, escapes it to be a valid URL fragment.

static	fixTagAttributes (string $text, string $element, bool $sorted=false)
	Take a tag soup fragment listing an HTML element's attributes and normalize it to well-formed XML, discarding unwanted attributes.

static	getRecognizedTagData (array $extratags=[], array $removetags=[])
	Return the various lists of recognized tags.

static	hackDocType ()
	Hack up a private DOCTYPE with HTML's standard entity declarations.

static	internalRemoveHtmlTags (string $text, ?callable $processCallback=null, $args=[], array $extratags=[], array $removetags=[])
	Cleans up HTML, removes dangerous tags and attributes, and removes HTML comments; BEWARE there may be unmatched HTML tags in the result.

static	isReservedDataAttribute (string $attr)
	Given an attribute name, checks whether it is a reserved data attribute (such as data-mw-foo) which is unavailable to user-generated HTML so MediaWiki core and extension code can safely use it to communicate with frontend code.

static	mergeAttributes (array $a, array $b)
	Merge two sets of HTML attributes.

static	normalizeCharReferences (string $text)
	Ensure that any entities and character references are legal for XML and XHTML specifically.

static	normalizeCss (string $value)
	Normalize CSS into a format we can easily search for hostile input.

static	normalizeSectionNameWhitespace (string $section)
	Normalizes whitespace in a section name, such as might be returned by Parser::stripSectionName(), for use in the id's that are used for section links.

static	removeHTMLcomments (string $text)
	Remove '', and everything between.

static	removeSomeTags (string $text, array $options=[])
	Cleans up HTML, removes dangerous tags and attributes, and removes HTML comments; the result will always be balanced and tidy HTML.

static	safeEncodeAttribute (string $text)
	Encode an attribute value for HTML tags, with extra armoring against further wiki processing.

static	safeEncodeTagAttributes (array $assoc_array)
	Build a partial tag string from an associative array of attribute names and values as returned by decodeTagAttributes.

static	stripAllTags (string $html)
	Take a fragment of (potentially invalid) HTML and return a version with any tags removed, encoded as plain text.

static	validateAttributes (array $attribs, array $allowed)
	Take an array of attribute names and values and normalize or discard illegal values.

static	validateEmail (string $addr)
	Does a string look like an e-mail address?

static	validateTagAttributes (array $attribs, string $element)
	Take an array of attribute names and values and normalize or discard illegal values for the given element type.

Public Attributes
const	ID_FALLBACK = 1
	Tells escapeUrlForHtml() to encode the ID using the fallback encoding, or return false if no fallback is configured.

const	ID_PRIMARY = 0
	Tells escapeUrlForHtml() to encode the ID using the wiki's primary encoding.

Detailed Description

HTML sanitizer for MediaWiki.

Definition at line 46 of file Sanitizer.php.

Member Function Documentation

◆ armorFrenchSpaces()

static MediaWiki\Parser\Sanitizer::armorFrenchSpaces	(	string	$text,
		string	$space = ' ' )

static

Armor French spaces with a replacement character.

Since: 1.32

Parameters

string	$text	Text to armor
string	$space	Space character for the French spaces, defaults to ' '

Returns: string Armored text

Definition at line 823 of file Sanitizer.php.

◆ checkCss()

static MediaWiki\Parser\Sanitizer::checkCss ( $value )

static

Pick apart some CSS and check it for forbidden or unsafe structures.

Returns a sanitized string. This sanitized string will have character references and escape sequences decoded and comments stripped (unless it is itself one valid comment, in which case the value will be passed through). If the input is just too evil, only a comment complaining about evilness will be returned.

Currently URL references, 'expression', 'tps' are forbidden.

NOTE: Despite the fact that character references are decoded, the returned string may contain character references given certain clever input strings. These character references must be escaped before the return value is embedded in HTML.

Warning: This method is intended to sanitize style attributes on html tags only. It is not safe to use on full CSS files.

Parameters

string $value

Returns: string

Definition at line 710 of file Sanitizer.php.

Referenced by MediaWiki\Parser\CoreParserFunctions\displaytitle().

◆ cleanUrl()

static MediaWiki\Parser\Sanitizer::cleanUrl ( string $url )

static

Definition at line 1667 of file Sanitizer.php.

◆ decodeCharReferences()

static MediaWiki\Parser\Sanitizer::decodeCharReferences ( string $text )

static

Decode any character references, numeric or named entities, in the text and return a UTF-8 string.

Definition at line 1275 of file Sanitizer.php.

◆ decodeCharReferencesAndNormalize()

static MediaWiki\Parser\Sanitizer::decodeCharReferencesAndNormalize ( string $text )

static

Decode any character references, numeric or named entities, in the next and normalize the resulting string.

(T16952)

This is useful for page titles, not for text to be displayed, MediaWiki allows HTML entities to escape normalization as a feature.

Parameters

string $text Already normalized, containing entities

Returns: string Still normalized, without entities

Definition at line 1293 of file Sanitizer.php.

Referenced by MediaWiki\Parser\CoreParserFunctions\displaytitle().

◆ decodeTagAttributes()

static MediaWiki\Parser\Sanitizer::decodeTagAttributes ( string $text )

static

Return an associative array of attribute names and values from a partial tag string.

Attribute names are forced to lowercase, character references are decoded to UTF-8 text.

Definition at line 1073 of file Sanitizer.php.

◆ encodeAttribute()

static MediaWiki\Parser\Sanitizer::encodeAttribute ( string $text )

static

Encode an attribute value for HTML output.

Parameters

string $text

Returns: string HTML-encoded text fragment

Definition at line 800 of file Sanitizer.php.

◆ escapeClass()

static MediaWiki\Parser\Sanitizer::escapeClass ( string $class )

static

Given a value, escape it so that it can be used as a CSS class and return it.

Todo: For extra validity, input should be validated UTF-8.

See also: https://www.w3.org/TR/CSS21/syndata.html Valid characters/format

Definition at line 1036 of file Sanitizer.php.

◆ escapeCombiningChar()

static MediaWiki\Parser\Sanitizer::escapeCombiningChar ( string $html )

static

Definition at line 1044 of file Sanitizer.php.

◆ escapeHtmlAllowEntities()

static MediaWiki\Parser\Sanitizer::escapeHtmlAllowEntities ( string $html )

static

Given HTML input, escape with htmlspecialchars but un-escape entities.

This allows (generally harmless) entities like   to survive.

Parameters

string $html HTML to escape

Returns: string Escaped input

Definition at line 1059 of file Sanitizer.php.

◆ escapeIdForAttribute()

static MediaWiki\Parser\Sanitizer::escapeIdForAttribute	(	string	$id,
		int	$mode = self::ID_PRIMARY )

static

Given a section name or other user-generated or otherwise unsafe string, escapes it to be a valid HTML id attribute.

WARNING: The output of this function is not guaranteed to be HTML safe, so be sure to use proper escaping.

Parameters

string	$id	String to escape
int	$mode	One of ID_* constants, specifying whether the primary or fallback encoding should be used.

Returns: string|false Escaped ID or false if fallback encoding is requested but it's not configured.

Since: 1.30

Definition at line 893 of file Sanitizer.php.

◆ escapeIdForExternalInterwiki()

static MediaWiki\Parser\Sanitizer::escapeIdForExternalInterwiki ( string $id )

static

Given a section name or other user-generated or otherwise unsafe string, escapes it to be a valid URL fragment for external interwikis.

Parameters

string $id String to escape

Returns: string Escaped ID

Since: 1.30

Definition at line 943 of file Sanitizer.php.

◆ escapeIdForLink()

static MediaWiki\Parser\Sanitizer::escapeIdForLink ( string $id )

static

Given a section name or other user-generated or otherwise unsafe string, escapes it to be a valid URL fragment.

WARNING: The output of this function is not guaranteed to be HTML safe, so be sure to use proper escaping.

Parameters

string $id String to escape

Returns: string Escaped ID

Since: 1.30

Definition at line 920 of file Sanitizer.php.

Referenced by MediaWiki\Parser\LinkHolderArray\replaceInternal().

◆ fixTagAttributes()

static MediaWiki\Parser\Sanitizer::fixTagAttributes	(	string	$text,
		string	$element,
		bool	$sorted = false )

static

Take a tag soup fragment listing an HTML element's attributes and normalize it to well-formed XML, discarding unwanted attributes.

Output is safe for further wikitext processing, with escaping of values that could trigger problems.

Normalizes attribute names to lowercase
Discards attributes not allowed for the given element
Turns broken or invalid entities into plaintext
Double-quotes all attribute values
Attributes without values are given the name as attribute
Double attributes are discarded
Unsafe style attributes are discarded
Prepends space if there are attributes.
(Optionally) Sorts attributes by name.

Parameters

string	$text
string	$element
bool	$sorted	Whether to sort the attributes (default: false)

Returns: string

Definition at line 778 of file Sanitizer.php.

◆ getRecognizedTagData()

static MediaWiki\Parser\Sanitizer::getRecognizedTagData	(	array	$extratags = [],
		array	$removetags = [] )

static

Return the various lists of recognized tags.

Parameters

string[]	$extratags	For any extra tags to include
string[]	$removetags	For any tags (default or extra) to exclude

Returns: array

Access: internal

Definition at line 155 of file Sanitizer.php.

◆ hackDocType()

static MediaWiki\Parser\Sanitizer::hackDocType ( )

static

Hack up a private DOCTYPE with HTML's standard entity declarations.

PHP 4 seemed to know these if you gave it an HTML doctype, but PHP 5.1 doesn't.

Use for passing XHTML fragments to PHP's XML parsing functions

Deprecated: since 1.36; will be made private or removed in a future release.

Definition at line 1647 of file Sanitizer.php.

◆ internalRemoveHtmlTags()

static MediaWiki\Parser\Sanitizer::internalRemoveHtmlTags	(	string	$text,
		?callable	$processCallback = null,
			$args = [],
		array	$extratags = [],
		array	$removetags = [] )

static

Cleans up HTML, removes dangerous tags and attributes, and removes HTML comments; BEWARE there may be unmatched HTML tags in the result.

Note: Callers are recommended to use ::removeSomeTags() instead of this method. Sanitizer::removeSomeTags() is safer and will always return well-formed HTML; however, it is significantly slower (especially for short strings where setup costs predominate). This method is for internal use by the legacy parser where we know the result will be cleaned up in a subsequent tidy pass.

Parameters

string	$text	Original string; see T268353 for why untainted.
callable \| null	$processCallback	Callback to do any variable or parameter replacements in HTML attribute values. This argument should be considered

Access: internal: .

Parameters

array \| bool	$args	Arguments for the processing callback
array	$extratags	For any extra tags to include
array	$removetags	For any tags (default or extra) to exclude

Returns: string

Access: internal

Definition at line 268 of file Sanitizer.php.

◆ isReservedDataAttribute()

static MediaWiki\Parser\Sanitizer::isReservedDataAttribute ( string $attr )

static

Given an attribute name, checks whether it is a reserved data attribute (such as data-mw-foo) which is unavailable to user-generated HTML so MediaWiki core and extension code can safely use it to communicate with frontend code.

Parameters

string $attr Attribute name.

Returns: bool

Definition at line 599 of file Sanitizer.php.

◆ mergeAttributes()

static MediaWiki\Parser\Sanitizer::mergeAttributes	(	array	$a,
		array	$b )

static

Merge two sets of HTML attributes.

Conflicting items in the second set will override those in the first, except for 'class' attributes which will be combined (if they're both strings).

Todo: implement merging for other attributes such as style

Definition at line 617 of file Sanitizer.php.

◆ normalizeCharReferences()

static MediaWiki\Parser\Sanitizer::normalizeCharReferences ( string $text )

static

Ensure that any entities and character references are legal for XML and XHTML specifically.

Any stray bits will be &-escaped to result in a valid text fragment.

a. named char refs can only be < > & ", others are numericized (this way we're well-formed even without a DTD) b. any numeric char refs must be legal chars, not invalid or forbidden c. use lower cased "&#x", not "&#X" d. fix or reject non-valid attributes

Access: internal

Definition at line 1183 of file Sanitizer.php.

◆ normalizeCss()

static MediaWiki\Parser\Sanitizer::normalizeCss ( string $value )

static

Normalize CSS into a format we can easily search for hostile input.

decode character references
decode escape sequences
remove comments, unless the entire value is one single comment
Parameters

string $value the css string

Returns
string normalized css

Definition at line 638 of file Sanitizer.php.

◆ normalizeSectionNameWhitespace()

static MediaWiki\Parser\Sanitizer::normalizeSectionNameWhitespace ( string $section )

static

Normalizes whitespace in a section name, such as might be returned by Parser::stripSectionName(), for use in the id's that are used for section links.

Definition at line 1161 of file Sanitizer.php.

References wfLogWarning().

◆ removeHTMLcomments()

static MediaWiki\Parser\Sanitizer::removeHTMLcomments ( string $text )

static

Remove '', and everything between.

To avoid leaving blank lines, when a comment is both preceded and followed by a newline (ignoring spaces), trim leading and trailing spaces and one of the newlines.

Definition at line 389 of file Sanitizer.php.

◆ removeSomeTags()

static MediaWiki\Parser\Sanitizer::removeSomeTags	(	string	$text,
		array	$options = [] )

static

Cleans up HTML, removes dangerous tags and attributes, and removes HTML comments; the result will always be balanced and tidy HTML.

Parameters

string	$text	Source string; see T268353 for why untainted
array	$options	Options controlling the cleanup: string[] $options['extraTags'] Any extra tags to allow (This property taints the whole array.) string[] $options['removeTags'] Any tags (default or extra) to exclude callable(Attributes,...):Attributes $options['attrCallback'] Callback to do any variable or parameter replacements in HTML attribute values before further cleanup; should be considered

Access: internal: and not for external use. array $options['attrCallbackArgs'] Additional arguments for the attribute callback

Returns: string The cleaned up HTML

Since: 1.38

Definition at line 343 of file Sanitizer.php.

Referenced by MediaWiki\Parser\CoreParserFunctions\displaytitle(), and MediaWiki\Parser\Parser\parse().

◆ safeEncodeAttribute()

static MediaWiki\Parser\Sanitizer::safeEncodeAttribute ( string $text )

static

Encode an attribute value for HTML tags, with extra armoring against further wiki processing.

Parameters

string $text

Returns: string HTML-encoded text fragment

Definition at line 844 of file Sanitizer.php.

◆ safeEncodeTagAttributes()

static MediaWiki\Parser\Sanitizer::safeEncodeTagAttributes ( array $assoc_array )

static

Build a partial tag string from an associative array of attribute names and values as returned by decodeTagAttributes.

Definition at line 1112 of file Sanitizer.php.

◆ stripAllTags()

static MediaWiki\Parser\Sanitizer::stripAllTags ( string $html )

static

Take a fragment of (potentially invalid) HTML and return a version with any tags removed, encoded as plain text.

Warning: this return value must be further escaped for literal inclusion in HTML output as of 1.10!

Parameters

string $html HTML fragment

Returns: string

Definition at line 1622 of file Sanitizer.php.

Referenced by MediaWiki\Parser\CoreParserFunctions\displaytitle().

◆ validateAttributes()

static MediaWiki\Parser\Sanitizer::validateAttributes	(	array	$attribs,
		array	$allowed )

static

Take an array of attribute names and values and normalize or discard illegal values.

Discards attributes not on the given list
Unsafe style attributes are discarded
Invalid id attributes are re-encoded

Parameters

array	$attribs
array	$allowed	List of allowed attribute names, as an associative array where keys give valid attribute names (since 1.34). Before 1.35, passing a sequential array of valid attribute names was permitted but that is now deprecated.

Returns: array

Todo

Check for legal values where the DTD limits things.

Check for unique id attribute :P

Definition at line 489 of file Sanitizer.php.

References wfDeprecated().

◆ validateEmail()

static MediaWiki\Parser\Sanitizer::validateEmail ( string $addr )

static

Does a string look like an e-mail address?

This validates an email address using an HTML5 specification found at: http://www.whatwg.org/html/states-of-the-type-attribute.html#valid-e-mail-address Which as of 2011-01-24 says:

A valid e-mail address is a string that matches the ABNF production 1*( atext / "." ) "@" ldh-str *( "." ldh-str ) where atext is defined in RFC 5322 section 3.2.3, and ldh-str is defined in RFC 1034 section 3.5.

This function is an implementation of the specification as requested in T24449.

Client-side forms will use the same standard validation rules via JS or HTML 5 validation; additional restrictions can be enforced server-side by extensions via the 'isValidEmailAddr' hook.

Note that this validation doesn't 100% match RFC 2822, but is believed to be liberal enough for wide use. Some invalid addresses will still pass validation here.

Since: 1.18

Parameters

string $addr E-mail address

Returns: bool

Definition at line 1776 of file Sanitizer.php.

◆ validateTagAttributes()

static MediaWiki\Parser\Sanitizer::validateTagAttributes	(	array	$attribs,
		string	$element )

static

Take an array of attribute names and values and normalize or discard illegal values for the given element type.

Discards attributes not allowed for the given element
Unsafe style attributes are discarded
Invalid id attributes are re-encoded

Todo
Check for legal values where the DTD limits things.

Check for unique id attribute :P

Definition at line 466 of file Sanitizer.php.

Referenced by MediaWiki\Parser\RemexRemoveTagHandler\startTag().

Member Data Documentation

◆ ID_FALLBACK

const MediaWiki\Parser\Sanitizer::ID_FALLBACK = 1

Tells escapeUrlForHtml() to encode the ID using the fallback encoding, or return false if no fallback is configured.

Since: 1.30

Definition at line 90 of file Sanitizer.php.

◆ ID_PRIMARY

const MediaWiki\Parser\Sanitizer::ID_PRIMARY = 0

Tells escapeUrlForHtml() to encode the ID using the wiki's primary encoding.

Since: 1.30

Definition at line 82 of file Sanitizer.php.

The documentation for this class was generated from the following file:

includes/parser/Sanitizer.php

Static Public Member Functions

Public Attributes

Detailed Description

Member Function Documentation

◆ armorFrenchSpaces()

◆ checkCss()

◆ cleanUrl()

◆ decodeCharReferences()

◆ decodeCharReferencesAndNormalize()

◆ decodeTagAttributes()

◆ encodeAttribute()

◆ escapeClass()

◆ escapeCombiningChar()

◆ escapeHtmlAllowEntities()

◆ escapeIdForAttribute()

◆ escapeIdForExternalInterwiki()

◆ escapeIdForLink()

◆ fixTagAttributes()

◆ getRecognizedTagData()

◆ hackDocType()

◆ internalRemoveHtmlTags()

◆ isReservedDataAttribute()

◆ mergeAttributes()

◆ normalizeCharReferences()

◆ normalizeCss()

◆ normalizeSectionNameWhitespace()

◆ removeHTMLcomments()

◆ removeSomeTags()

◆ safeEncodeAttribute()

◆ safeEncodeTagAttributes()

◆ stripAllTags()

◆ validateAttributes()

◆ validateEmail()

◆ validateTagAttributes()

Member Data Documentation

◆ ID_FALLBACK

◆ ID_PRIMARY