mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
452 lines
13 KiB
PHP
452 lines
13 KiB
PHP
<?php
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/**
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* Library of conversion functions, implemented as static methods.
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*
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* The methods are all of the form (format)2(format), where the format is one of
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*
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* raw: A UTF8 string
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* attr: A UTF8 string suitable for inclusion in an HTML attribute
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* js: A UTF8 string suitable for inclusion in a double-quoted javascript string.
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*
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* array: A PHP associative array
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* json: JavaScript object notation
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*
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* html: HTML source suitable for use in a page or email
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* text: Plain-text content, suitable for display to a user as-is, or insertion in a plaintext email.
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*
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* Objects of type {@link ViewableData} can have an "escaping type",
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* which determines if they are automatically escaped before output by {@link SSViewer}.
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*
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* @package framework
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* @subpackage misc
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*/
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class Convert {
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/**
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* Convert a value to be suitable for an XML attribute.
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*
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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public static function raw2att($val) {
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return self::raw2xml($val);
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}
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/**
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* Convert a value to be suitable for an HTML attribute.
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*
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* @param string|array $val String to escape, or array of strings
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* @return array|string
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*/
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public static function raw2htmlatt($val) {
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return self::raw2att($val);
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}
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/**
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* Convert a value to be suitable for an HTML ID attribute. Replaces non
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* supported characters with a space.
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*
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* @see http://www.w3.org/TR/REC-html40/types.html#type-cdata
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*
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* @param array|string $val String to escape, or array of strings
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*
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* @return array|string
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*/
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public static function raw2htmlname($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) {
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$val[$k] = self::raw2htmlname($v);
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}
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return $val;
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} else {
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return self::raw2att($val);
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}
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}
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/**
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* Convert a value to be suitable for an HTML ID attribute. Replaces non
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* supported characters with an underscore.
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*
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* @see http://www.w3.org/TR/REC-html40/types.html#type-cdata
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*
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* @param array|string $val String to escape, or array of strings
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*
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* @return array|string
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*/
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public static function raw2htmlid($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) {
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$val[$k] = self::raw2htmlid($v);
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}
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return $val;
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} else {
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return trim(preg_replace(
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'/_+/', '_', preg_replace('/[^a-zA-Z0-9\-_:.]+/','_', $val)),
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'_'
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);
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}
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}
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/**
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* Ensure that text is properly escaped for XML.
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*
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* @see http://www.w3.org/TR/REC-xml/#dt-escape
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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public static function raw2xml($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::raw2xml($v);
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return $val;
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} else {
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return htmlspecialchars($val, ENT_QUOTES, 'UTF-8');
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}
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}
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/**
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* Ensure that text is properly escaped for Javascript.
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*
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* @param array|string $val String to escape, or array of strings
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* @return array|string
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*/
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public static function raw2js($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::raw2js($v);
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return $val;
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} else {
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return str_replace(
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// Intercepts some characters such as <, >, and & which can interfere
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array("\\", '"', "\n", "\r", "'", "<", ">", "&"),
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array("\\\\", '\"', '\n', '\r', "\\'", "\\x3c", "\\x3e", "\\x26"),
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$val
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);
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}
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}
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/**
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* Encode a value as a JSON encoded string. You can optionally pass a bitmask of
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* JSON constants as options through to the encode function.
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*
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* @param mixed $val Value to be encoded
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* @param int $options Optional bitmask of JSON constants
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* @return string JSON encoded string
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*/
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public static function raw2json($val, $options = 0) {
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return json_encode($val, $options);
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}
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/**
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* Encode an array as a JSON encoded string.
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* This is an alias to {@link raw2json()}
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*
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* @param array $val Array to convert
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* @param int $options Optional bitmask of JSON constants
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* @return string JSON encoded string
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*/
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public static function array2json($val, $options = 0) {
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return self::raw2json($val, $options);
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}
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/**
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* Safely encodes a value (or list of values) using the current database's
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* safe string encoding method
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*
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* @param mixed|array $val Input value, or list of values as an array
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* @param boolean $quoted Flag indicating whether the value should be safely
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* quoted, instead of only being escaped. By default this function will
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* only escape the string (false).
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* @return string|array Safely encoded value in the same format as the input
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*/
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public static function raw2sql($val, $quoted = false) {
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if(is_array($val)) {
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foreach($val as $k => $v) {
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$val[$k] = self::raw2sql($v, $quoted);
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}
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return $val;
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} else {
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if($quoted) {
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return DB::get_conn()->quoteString($val);
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} else {
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return DB::get_conn()->escapeString($val);
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}
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}
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}
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/**
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* Safely encodes a SQL symbolic identifier (or list of identifiers), such as a database,
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* table, or column name. Supports encoding of multi identfiers separated by
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* a delimiter (e.g. ".")
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*
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* @param string|array $identifier The identifier to escape. E.g. 'SiteTree.Title'
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* @param string $separator The string that delimits subsequent identifiers
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* @return string|array The escaped identifier. E.g. '"SiteTree"."Title"'
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*/
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public static function symbol2sql($identifier, $separator = '.') {
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if(is_array($identifier)) {
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foreach($identifier as $k => $v) {
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$identifier[$k] = self::symbol2sql($v, $separator);
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}
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return $identifier;
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} else {
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return DB::get_conn()->escapeIdentifier($identifier, $separator);
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}
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}
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/**
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* Convert XML to raw text.
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* @uses html2raw()
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* @todo Currently &#xxx; entries are stripped; they should be converted
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*/
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public static function xml2raw($val) {
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if(is_array($val)) {
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foreach($val as $k => $v) $val[$k] = self::xml2raw($v);
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return $val;
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} else {
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// More complex text needs to use html2raw instead
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if(strpos($val,'<') !== false) return self::html2raw($val);
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else return html_entity_decode($val, ENT_QUOTES, 'UTF-8');
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}
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}
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/**
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* Convert a JSON encoded string into an object.
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*
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* @param string $val
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* @return object|boolean
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*/
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public static function json2obj($val) {
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return json_decode($val);
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}
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/**
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* Convert a JSON string into an array.
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*
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* @uses json2obj
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* @param string $val JSON string to convert
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* @return array|boolean
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*/
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public static function json2array($val) {
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return json_decode($val, true);
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}
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/**
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* Converts an XML string to a PHP array
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* See http://phpsecurity.readthedocs.org/en/latest/Injection-Attacks.html#xml-external-entity-injection
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*
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* @uses recursiveXMLToArray()
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* @param string $val
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* @param boolean $disableDoctypes Disables the use of DOCTYPE, and will trigger an error if encountered.
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* false by default.
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* @param boolean $disableExternals Disables the loading of external entities. false by default.
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* @return array
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*/
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public static function xml2array($val, $disableDoctypes = false, $disableExternals = false) {
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// Check doctype
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if($disableDoctypes && preg_match('/\<\!DOCTYPE.+]\>/', $val)) {
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throw new InvalidArgumentException('XML Doctype parsing disabled');
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}
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// Disable external entity loading
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if($disableExternals) $oldVal = libxml_disable_entity_loader($disableExternals);
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try {
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$xml = new SimpleXMLElement($val);
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$result = self::recursiveXMLToArray($xml);
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} catch(Exception $ex) {
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if($disableExternals) libxml_disable_entity_loader($oldVal);
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throw $ex;
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}
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if($disableExternals) libxml_disable_entity_loader($oldVal);
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return $result;
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}
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/**
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* Convert a XML string to a PHP array recursively. Do not
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* call this function directly, Please use {@link Convert::xml2array()}
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*
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* @param SimpleXMLElement
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*
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* @return mixed
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*/
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protected static function recursiveXMLToArray($xml) {
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if(is_object($xml) && get_class($xml) == 'SimpleXMLElement') {
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$attributes = $xml->attributes();
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foreach($attributes as $k => $v) {
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if($v) $a[$k] = (string) $v;
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}
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$x = $xml;
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$xml = get_object_vars($xml);
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}
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if(is_array($xml)) {
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if(count($xml) == 0) return (string) $x; // for CDATA
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foreach($xml as $key => $value) {
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$r[$key] = self::recursiveXMLToArray($value);
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}
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if(isset($a)) $r['@'] = $a; // Attributes
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return $r;
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}
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return (string) $xml;
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}
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/**
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* Create a link if the string is a valid URL
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*
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* @param string $string The string to linkify
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* @return string A link to the URL if string is a URL
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*/
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public static function linkIfMatch($string) {
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if( preg_match( '/^[a-z+]+\:\/\/[a-zA-Z0-9$-_.+?&=!*\'()%]+$/', $string ) )
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return "<a style=\"white-space: nowrap\" href=\"$string\">$string</a>";
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else
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return $string;
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}
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/**
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* Simple conversion of HTML to plaintext.
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*
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* @param string $data Input data
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* @param bool $preserveLinks
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* @param int $wordWrap
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* @param array $config
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* @return string
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*/
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public static function html2raw($data, $preserveLinks = false, $wordWrap = 0, $config = null) {
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$defaultConfig = array(
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'PreserveLinks' => false,
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'ReplaceBoldAsterisk' => true,
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'CompressWhitespace' => true,
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'ReplaceImagesWithAlt' => true,
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);
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if(isset($config)) {
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$config = array_merge($defaultConfig,$config);
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} else {
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$config = $defaultConfig;
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}
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$data = preg_replace("/<style([^A-Za-z0-9>][^>]*)?>.*?<\/style[^>]*>/is","", $data);
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$data = preg_replace("/<script([^A-Za-z0-9>][^>]*)?>.*?<\/script[^>]*>/is","", $data);
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if($config['ReplaceBoldAsterisk']) {
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$data = preg_replace('%<(strong|b)( [^>]*)?>|</(strong|b)>%i','*',$data);
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}
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// Expand hyperlinks
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if(!$preserveLinks && !$config['PreserveLinks']) {
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$data = preg_replace_callback('/<a[^>]*href\s*=\s*"([^"]*)">(.*?)<\/a>/ui', function($matches) {
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return Convert::html2raw($matches[2]) . "[$matches[1]]";
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}, $data);
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$data = preg_replace_callback('/<a[^>]*href\s*=\s*([^ ]*)>(.*?)<\/a>/ui', function($matches) {
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return Convert::html2raw($matches[2]) . "[$matches[1]]";
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}, $data);
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}
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// Replace images with their alt tags
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if($config['ReplaceImagesWithAlt']) {
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$data = preg_replace('/<img[^>]*alt *= *"([^"]*)"[^>]*>/i', ' \\1 ', $data);
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$data = preg_replace('/<img[^>]*alt *= *([^ ]*)[^>]*>/i', ' \\1 ', $data);
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}
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// Compress whitespace
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if($config['CompressWhitespace']) {
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$data = preg_replace("/\s+/u", " ", $data);
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}
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// Parse newline tags
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$data = preg_replace("/\s*<[Hh][1-6]([^A-Za-z0-9>][^>]*)?> */u", "\n\n", $data);
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$data = preg_replace("/\s*<[Pp]([^A-Za-z0-9>][^>]*)?> */u", "\n\n", $data);
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$data = preg_replace("/\s*<[Dd][Ii][Vv]([^A-Za-z0-9>][^>]*)?> */u", "\n\n", $data);
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$data = preg_replace("/\n\n\n+/", "\n\n", $data);
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$data = preg_replace("/<[Bb][Rr]([^A-Za-z0-9>][^>]*)?> */", "\n", $data);
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$data = preg_replace("/<[Tt][Rr]([^A-Za-z0-9>][^>]*)?> */", "\n", $data);
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$data = preg_replace("/<\/[Tt][Dd]([^A-Za-z0-9>][^>]*)?> */", " ", $data);
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$data = preg_replace('/<\/p>/i', "\n\n", $data );
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// Replace HTML entities
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$data = html_entity_decode($data, ENT_QUOTES, 'UTF-8');
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// Remove all tags (but optionally keep links)
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// strip_tags seemed to be restricting the length of the output
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// arbitrarily. This essentially does the same thing.
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if(!$preserveLinks && !$config['PreserveLinks']) {
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$data = preg_replace('/<\/?[^>]*>/','', $data);
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} else {
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$data = strip_tags($data, '<a>');
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}
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// Wrap
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if($wordWrap) $data = wordwrap(trim($data), $wordWrap);
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return trim($data);
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}
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/**
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* There are no real specifications on correctly encoding mailto-links,
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* but this seems to be compatible with most of the user-agents.
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* Does nearly the same as rawurlencode().
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* Please only encode the values, not the whole url, e.g.
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* "mailto:test@test.com?subject=" . Convert::raw2mailto($subject)
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*
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* @param $data string
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* @return string
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* @see http://www.ietf.org/rfc/rfc1738.txt
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*/
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public static function raw2mailto($data) {
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return str_ireplace(
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array("\n",'?','=',' ','(',')','&','@','"','\'',';'),
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array('%0A','%3F','%3D','%20','%28','%29','%26','%40','%22','%27','%3B'),
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$data
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);
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}
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/**
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* Convert a string (normally a title) to a string suitable for using in
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* urls and other html attributes. Uses {@link URLSegmentFilter}.
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*
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* @param string
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* @return string
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*/
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public static function raw2url($title) {
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$f = URLSegmentFilter::create();
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return $f->filter($title);
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}
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/**
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* Normalises newline sequences to conform to (an) OS specific format.
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*
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* @param string $data Text containing potentially mixed formats of newline
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* sequences including \r, \r\n, \n, or unicode newline characters
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* @param string $nl The newline sequence to normalise to. Defaults to that
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* specified by the current OS
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* @return string
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*/
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public static function nl2os($data, $nl = PHP_EOL) {
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return preg_replace('~\R~u', $nl, $data);
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}
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/**
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* Encode a value into a string that can be used as part of a filename.
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* All string data must be UTF-8 encoded.
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*
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* @param mixed $val Value to be encoded
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* @return string
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*/
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public static function base64url_encode($val) {
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return rtrim(strtr(base64_encode(json_encode($val)), '+/', '~_'), '=');
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}
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/**
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* Decode a value that was encoded with Convert::base64url_encode.
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*
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* @param string $val Value to be decoded
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* @return mixed Original value
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*/
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public static function base64url_decode($val) {
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return json_decode(
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base64_decode(str_pad(strtr($val, '~_', '+/'), strlen($val) % 4, '=', STR_PAD_RIGHT)),
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true
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);
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}
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}
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