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Delete 'functions-formatting.php'

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Sophia Atkinson 2022-10-30 14:07:22 -07:00
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<?php
/*
* YOURLS
* Function library for anything related to formatting / validating / sanitizing
*/
/**
* Convert an integer (1337) to a string (3jk).
*
* @param int $num Number to convert
* @param string $chars Characters to use for conversion
* @return string Converted number
*/
function yourls_int2string($num, $chars = null) {
if( $chars == null )
$chars = yourls_get_shorturl_charset();
$string = '';
$len = strlen( $chars );
while( $num >= $len ) {
$mod = bcmod( (string)$num, (string)$len );
$num = bcdiv( (string)$num, (string)$len );
$string = $chars[ $mod ] . $string;
}
$string = $chars[ intval( $num ) ] . $string;
return yourls_apply_filter( 'int2string', $string, $num, $chars );
}
/**
* Convert a string (3jk) to an integer (1337)
*
* @param string $string String to convert
* @param string $chars Characters to use for conversion
* @return string Number (as a string)
*/
function yourls_string2int($string, $chars = null) {
if( $chars == null )
$chars = yourls_get_shorturl_charset();
$integer = 0;
$string = strrev( $string );
$baselen = strlen( $chars );
$inputlen = strlen( $string );
for ($i = 0; $i < $inputlen; $i++) {
$index = strpos( $chars, $string[$i] );
$integer = bcadd( (string)$integer, bcmul( (string)$index, bcpow( (string)$baselen, (string)$i ) ) );
}
return yourls_apply_filter( 'string2int', $integer, $string, $chars );
}
/**
* Return a unique string to be used as a valid HTML id
*
* @since 1.8.3
* @param string $prefix Optional prefix
* @return string The unique string
*/
function yourls_unique_element_id($prefix = 'yid') {
static $id_counter = 0;
return yourls_apply_filter( 'unique_element_id', $prefix . (string)++$id_counter );
}
/**
* Make sure a link keyword (ie "1fv" as in "http://sho.rt/1fv") is acceptable
*
* If we are ADDING or EDITING a short URL, the keyword must comply to the short URL charset: every
* character that doesn't belong to it will be removed.
* But otherwise we must have a more conservative approach: we could be checking for a keyword that
* was once valid but now the short URL charset has changed. In such a case, we are treating the keyword for what
* it is: just a part of a URL, hence sanitize it as a URL.
*
* @param string $keyword short URL keyword
* @param bool $restrict_to_shorturl_charset Optional, default false. True if we want the keyword to comply to short URL charset
* @return string The sanitized keyword
*/
function yourls_sanitize_keyword( $keyword, $restrict_to_shorturl_charset = false ) {
if( $restrict_to_shorturl_charset === true ) {
// make a regexp pattern with the shorturl charset, and remove everything but this
$pattern = yourls_make_regexp_pattern( yourls_get_shorturl_charset() );
$valid = (string) substr( preg_replace( '![^'.$pattern.']!', '', $keyword ), 0, 199 );
} else {
$valid = yourls_sanitize_url( $keyword );
}
return yourls_apply_filter( 'sanitize_string', $valid, $keyword, $restrict_to_shorturl_charset );
}
/**
* Sanitize a page title. No HTML per W3C http://www.w3.org/TR/html401/struct/global.html#h-7.4.2
*
*
* @since 1.5
* @param string $unsafe_title Title, potentially unsafe
* @param string $fallback Optional fallback if after sanitization nothing remains
* @return string Safe title
*/
function yourls_sanitize_title( $unsafe_title, $fallback = '' ) {
$title = $unsafe_title;
$title = strip_tags( $title );
$title = preg_replace( "/\s+/", ' ', trim( $title ) );
if ( '' === $title || false === $title ) {
$title = $fallback;
}
return yourls_apply_filter( 'sanitize_title', $title, $unsafe_title, $fallback );
}
/**
* A few sanity checks on the URL. Used for redirection or DB.
* For redirection when you don't trust the URL ($_SERVER variable, query string), see yourls_sanitize_url_safe()
* For display purpose, see yourls_esc_url()
*
* @param string $unsafe_url unsafe URL
* @param array $protocols Optional allowed protocols, default to global $yourls_allowedprotocols
* @return string Safe URL
*/
function yourls_sanitize_url( $unsafe_url, $protocols = array() ) {
$url = yourls_esc_url( $unsafe_url, 'redirection', $protocols );
return yourls_apply_filter( 'sanitize_url', $url, $unsafe_url );
}
/**
* A few sanity checks on the URL, including CRLF. Used for redirection when URL to be sanitized is critical and cannot be trusted.
*
* Use when critical URL comes from user input or environment variable. In such a case, this function will sanitize
* it like yourls_sanitize_url() but will also remove %0A and %0D to prevent CRLF injection.
* Still, some legit URLs contain %0A or %0D (see issue 2056, and for extra fun 1694, 1707, 2030, and maybe others)
* so we're not using this function unless it's used for internal redirection when the target location isn't
* hardcoded, to avoid XSS via CRLF
*
* @since 1.7.2
* @param string $unsafe_url unsafe URL
* @param array $protocols Optional allowed protocols, default to global $yourls_allowedprotocols
* @return string Safe URL
*/
function yourls_sanitize_url_safe( $unsafe_url, $protocols = array() ) {
$url = yourls_esc_url( $unsafe_url, 'safe', $protocols );
return yourls_apply_filter( 'sanitize_url_safe', $url, $unsafe_url );
}
/**
* Perform a replacement while a string is found, eg $subject = '%0%0%0DDD', $search ='%0D' -> $result =''
*
* Stolen from WP's _deep_replace
*
* @param string|array $search Needle, or array of needles.
* @param string $subject Haystack.
* @return string The string with the replaced values.
*/
function yourls_deep_replace($search, $subject ){
$found = true;
while($found) {
$found = false;
foreach( (array) $search as $val ) {
while( strpos( $subject, $val ) !== false ) {
$found = true;
$subject = str_replace( $val, '', $subject );
}
}
}
return $subject;
}
/**
* Make sure an integer is a valid integer (PHP's intval() limits to too small numbers)
*
* @param int $int Integer to check
* @return string Integer as a string
*/
function yourls_sanitize_int($int ) {
return ( substr( preg_replace( '/[^0-9]/', '', strval( $int ) ), 0, 20 ) );
}
/**
* Sanitize an IP address
* No check on validity, just return a sanitized string
*
* @param string $ip IP address
* @return string IP address
*/
function yourls_sanitize_ip($ip ) {
return preg_replace( '/[^0-9a-fA-F:., ]/', '', $ip );
}
/**
* Make sure a date is m(m)/d(d)/yyyy, return false otherwise
*
* @param string $date Date to check
* @return false|mixed Date in format m(m)/d(d)/yyyy or false if invalid
*/
function yourls_sanitize_date($date ) {
if( !preg_match( '!^\d{1,2}/\d{1,2}/\d{4}$!' , $date ) ) {
return false;
}
return $date;
}
/**
* Sanitize a date for SQL search. Return false if malformed input.
*
* @param string $date Date
* @return false|string String in Y-m-d format for SQL search or false if malformed input
*/
function yourls_sanitize_date_for_sql($date) {
if( !yourls_sanitize_date( $date ) )
return false;
return date( 'Y-m-d', strtotime( $date ) );
}
/**
* Return trimmed string, optionally append '[...]' if string is too long
*
* @param string $string String to trim
* @param int $length Maximum length of string
* @param string $append String to append if trimmed
* @return string Trimmed string
*/
function yourls_trim_long_string($string, $length = 60, $append = '[...]') {
$newstring = $string;
if ( mb_strlen( $newstring ) > $length ) {
$newstring = mb_substr( $newstring, 0, $length - mb_strlen( $append ), 'UTF-8' ) . $append;
}
return yourls_apply_filter( 'trim_long_string', $newstring, $string, $length, $append );
}
/**
* Sanitize a version number (1.4.1-whatever-RC1 -> 1.4.1)
*
* The regexp searches for the first digits, then a period, then more digits and periods, and discards
* all the rest.
* For instance, 'mysql-5.5-beta' and '5.5-RC1' return '5.5'
*
* @since 1.4.1
* @param string $version Version number
* @return string Sanitized version number
*/
function yourls_sanitize_version( $version ) {
preg_match( '/([0-9]+\.[0-9.]+).*$/', $version, $matches );
$version = isset($matches[1]) ? trim($matches[1], '.') : '';
return $version;
}
/**
* Sanitize a filename (no Win32 stuff)
*
* @param string $file File name
* @return string|null Sanitized file name (or null if it's just backslashes, ok...)
*/
function yourls_sanitize_filename($file) {
$file = str_replace( '\\', '/', $file ); // sanitize for Win32 installs
$file = preg_replace( '|/+|' ,'/', $file ); // remove any duplicate slash
return $file;
}
/**
* Check if a string seems to be UTF-8. Stolen from WP.
*
* @param string $str String to check
* @return bool Whether string seems valid UTF-8
*/
function yourls_seems_utf8($str) {
$length = strlen( $str );
for ( $i=0; $i < $length; $i++ ) {
$c = ord( $str[ $i ] );
if ( $c < 0x80 ) $n = 0; # 0bbbbbbb
elseif (($c & 0xE0) == 0xC0) $n=1; # 110bbbbb
elseif (($c & 0xF0) == 0xE0) $n=2; # 1110bbbb
elseif (($c & 0xF8) == 0xF0) $n=3; # 11110bbb
elseif (($c & 0xFC) == 0xF8) $n=4; # 111110bb
elseif (($c & 0xFE) == 0xFC) $n=5; # 1111110b
else return false; # Does not match any model
for ($j=0; $j<$n; $j++) { # n bytes matching 10bbbbbb follow ?
if ((++$i == $length) || ((ord($str[$i]) & 0xC0) != 0x80))
return false;
}
}
return true;
}
/**
* Check for PCRE /u modifier support. Stolen from WP.
*
* Just in case "PCRE is not compiled with PCRE_UTF8" which seems to happen
* on some distros
*
* @since 1.7.1
*
* @return bool whether there's /u support or not
*/
function yourls_supports_pcre_u() {
static $utf8_pcre;
if( !isset( $utf8_pcre ) ) {
$utf8_pcre = (bool) @preg_match( '/^./u', 'a' );
}
return $utf8_pcre;
}
/**
* Checks for invalid UTF8 in a string. Stolen from WP
*
* @since 1.6
*
* @param string $string The text which is to be checked.
* @param boolean $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.
* @return string The checked text.
*/
function yourls_check_invalid_utf8( $string, $strip = false ) {
$string = (string) $string;
if ( 0 === strlen( $string ) ) {
return '';
}
// We can't demand utf8 in the PCRE installation, so just return the string in those cases
if ( ! yourls_supports_pcre_u() ) {
return $string;
}
// preg_match fails when it encounters invalid UTF8 in $string
if ( 1 === @preg_match( '/^./us', $string ) ) {
return $string;
}
// Attempt to strip the bad chars if requested (not recommended)
if ( $strip && function_exists( 'iconv' ) ) {
return iconv( 'utf-8', 'utf-8', $string );
}
return '';
}
/**
* Converts a number of special characters into their HTML entities. Stolen from WP.
*
* Specifically deals with: &, <, >, ", and '.
*
* $quote_style can be set to ENT_COMPAT to encode " to
* &quot;, or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
*
* @since 1.6
*
* @param string $string The text which is to be encoded.
* @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
* @param boolean $double_encode Optional. Whether to encode existing html entities. Default is false.
* @return string The encoded text with HTML entities.
*/
function yourls_specialchars( $string, $quote_style = ENT_NOQUOTES, $double_encode = false ) {
$string = (string) $string;
if ( 0 === strlen( $string ) )
return '';
// Don't bother if there are no specialchars - saves some processing
if ( ! preg_match( '/[&<>"\']/', $string ) )
return $string;
// Account for the previous behaviour of the function when the $quote_style is not an accepted value
if ( empty( $quote_style ) )
$quote_style = ENT_NOQUOTES;
elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) )
$quote_style = ENT_QUOTES;
$charset = 'UTF-8';
$_quote_style = $quote_style;
if ( $quote_style === 'double' ) {
$quote_style = ENT_COMPAT;
$_quote_style = ENT_COMPAT;
} elseif ( $quote_style === 'single' ) {
$quote_style = ENT_NOQUOTES;
}
// Handle double encoding ourselves
if ( $double_encode ) {
$string = @htmlspecialchars( $string, $quote_style, $charset );
} else {
// Decode &amp; into &
$string = yourls_specialchars_decode( $string, $_quote_style );
// Guarantee every &entity; is valid or re-encode the &
$string = yourls_kses_normalize_entities( $string );
// Now re-encode everything except &entity;
$string = preg_split( '/(&#?x?[0-9a-z]+;)/i', $string, -1, PREG_SPLIT_DELIM_CAPTURE );
for ( $i = 0; $i < count( $string ); $i += 2 )
$string[$i] = @htmlspecialchars( $string[$i], $quote_style, $charset );
$string = implode( '', $string );
}
// Backwards compatibility
if ( 'single' === $_quote_style )
$string = str_replace( "'", '&#039;', $string );
return $string;
}
/**
* Converts a number of HTML entities into their special characters. Stolen from WP.
*
* Specifically deals with: &, <, >, ", and '.
*
* $quote_style can be set to ENT_COMPAT to decode " entities,
* or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.
*
* @since 1.6
*
* @param string $string The text which is to be decoded.
* @param mixed $quote_style Optional. Converts double quotes if set to ENT_COMPAT, both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES. Also compatible with old _wp_specialchars() values; converting single quotes if set to 'single', double if set to 'double' or both if otherwise set. Default is ENT_NOQUOTES.
* @return string The decoded text without HTML entities.
*/
function yourls_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {
$string = (string) $string;
if ( 0 === strlen( $string ) ) {
return '';
}
// Don't bother if there are no entities - saves a lot of processing
if ( strpos( $string, '&' ) === false ) {
return $string;
}
// Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value
if ( empty( $quote_style ) ) {
$quote_style = ENT_NOQUOTES;
} elseif ( !in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
$quote_style = ENT_QUOTES;
}
// More complete than get_html_translation_table( HTML_SPECIALCHARS )
$single = array( '&#039;' => '\'', '&#x27;' => '\'' );
$single_preg = array( '/&#0*39;/' => '&#039;', '/&#x0*27;/i' => '&#x27;' );
$double = array( '&quot;' => '"', '&#034;' => '"', '&#x22;' => '"' );
$double_preg = array( '/&#0*34;/' => '&#034;', '/&#x0*22;/i' => '&#x22;' );
$others = array( '&lt;' => '<', '&#060;' => '<', '&gt;' => '>', '&#062;' => '>', '&amp;' => '&', '&#038;' => '&', '&#x26;' => '&' );
$others_preg = array( '/&#0*60;/' => '&#060;', '/&#0*62;/' => '&#062;', '/&#0*38;/' => '&#038;', '/&#x0*26;/i' => '&#x26;' );
$translation = $translation_preg = [];
if ( $quote_style === ENT_QUOTES ) {
$translation = array_merge( $single, $double, $others );
$translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
} elseif ( $quote_style === ENT_COMPAT || $quote_style === 'double' ) {
$translation = array_merge( $double, $others );
$translation_preg = array_merge( $double_preg, $others_preg );
} elseif ( $quote_style === 'single' ) {
$translation = array_merge( $single, $others );
$translation_preg = array_merge( $single_preg, $others_preg );
} elseif ( $quote_style === ENT_NOQUOTES ) {
$translation = $others;
$translation_preg = $others_preg;
}
// Remove zero padding on numeric entities
$string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );
// Replace characters according to translation table
return strtr( $string, $translation );
}
/**
* Escaping for HTML blocks. Stolen from WP
*
* @since 1.6
*
* @param string $text
* @return string
*/
function yourls_esc_html( $text ) {
$safe_text = yourls_check_invalid_utf8( $text );
$safe_text = yourls_specialchars( $safe_text, ENT_QUOTES );
return yourls_apply_filter( 'esc_html', $safe_text, $text );
}
/**
* Escaping for HTML attributes. Stolen from WP
*
* @since 1.6
*
* @param string $text
* @return string
*/
function yourls_esc_attr( $text ) {
$safe_text = yourls_check_invalid_utf8( $text );
$safe_text = yourls_specialchars( $safe_text, ENT_QUOTES );
return yourls_apply_filter( 'esc_attr', $safe_text, $text );
}
/**
* Checks and cleans a URL before printing it. Stolen from WP.
*
* A number of characters are removed from the URL. If the URL is for displaying
* (the default behaviour) ampersands are also replaced.
*
* This function by default "escapes" URL for display purpose (param $context = 'display') but can
* take extra steps in URL sanitization. See yourls_sanitize_url() and yourls_sanitize_url_safe()
*
* @since 1.6
*
* @param string $url The URL to be cleaned.
* @param string $context 'display' or something else. Use yourls_sanitize_url() for database or redirection usage.
* @param array $protocols Optional. Array of allowed protocols, defaults to global $yourls_allowedprotocols
* @return string The cleaned $url
*/
function yourls_esc_url( $url, $context = 'display', $protocols = array() ) {
// trim first -- see #1931
$url = trim( $url );
// make sure there's only one 'http://' at the beginning (prevents pasting a URL right after the default 'http://')
$url = str_replace(
array( 'http://http://', 'http://https://' ),
array( 'http://', 'https://' ),
$url
);
if ( '' == $url )
return $url;
$original_url = $url;
// force scheme and domain to lowercase - see issues 591 and 1630
$url = yourls_normalize_uri( $url );
$url = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\[\]\\x80-\\xff]|i', '', $url );
// Previous regexp in YOURLS was '|[^a-z0-9-~+_.?\[\]\^#=!&;,/:%@$\|*`\'<>"()\\x80-\\xff\{\}]|i'
// TODO: check if that was it too destructive
// If $context is 'safe', an extra step is taken to make sure no CRLF injection is possible.
// To be used when $url can be forged by evil user (eg it's from a $_SERVER variable, a query string, etc..)
if ( 'safe' == $context ) {
$strip = array( '%0d', '%0a', '%0D', '%0A' );
$url = yourls_deep_replace( $strip, $url );
}
// Replace ampersands and single quotes only when displaying.
if ( 'display' == $context ) {
$url = yourls_kses_normalize_entities( $url );
$url = str_replace( '&amp;', '&#038;', $url );
$url = str_replace( "'", '&#039;', $url );
}
// If there's a protocol, make sure it's OK
if( yourls_get_protocol($url) !== '' ) {
if ( ! is_array( $protocols ) or ! $protocols ) {
global $yourls_allowedprotocols;
$protocols = yourls_apply_filter( 'esc_url_protocols', $yourls_allowedprotocols );
// Note: $yourls_allowedprotocols is also globally filterable in functions-kses.php/yourls_kses_init()
}
if ( !yourls_is_allowed_protocol( $url, $protocols ) )
return '';
// I didn't use KSES function kses_bad_protocol() because it doesn't work the way I liked (returns //blah from illegal://blah)
}
return yourls_apply_filter( 'esc_url', $url, $original_url, $context );
}
/**
* Normalize a URI : lowercase scheme and domain, convert IDN to UTF8
*
* All in one example: 'HTTP://XN--mgbuq0c.Com/AbCd' -> 'http://طارق.com/AbCd'
* See issues 591, 1630, 1889, 2691
*
* This function is trickier than what seems to be needed at first
*
* First, we need to handle several URI types: http://example.com, mailto:ozh@ozh.ozh, facetime:user@example.com, and so on, see
* yourls_kses_allowed_protocols() in functions-kses.php
* The general rule is that the scheme ("stuff://" or "stuff:") is case insensitive and should be lowercase. But then, depending on the
* scheme, parts of what follows the scheme may or may not be case sensitive.
*
* Second, simply using parse_url() and its opposite http_build_url() is a pretty unsafe process:
* - parse_url() can easily trip up on malformed or weird URLs
* - exploding a URL with parse_url(), lowercasing some stuff, and glueing things back with http_build_url() does not handle well
* "stuff:"-like URI [1] and can result in URLs ending modified [2][3]. We don't want to *validate* URI, we just want to lowercase
* what is supposed to be lowercased.
*
* So, to be conservative, this function:
* - lowercases the scheme
* - does not lowercase anything else on "stuff:" URI
* - tries to lowercase only scheme and domain of "stuff://" URI
*
* [1] http_build_url(parse_url("mailto:ozh")) == "mailto:///ozh"
* [2] http_build_url(parse_url("http://blah#omg")) == "http://blah/#omg"
* [3] http_build_url(parse_url("http://blah?#")) == "http://blah/"
*
* @since 1.7.1
* @param string $url URL
* @return string URL with lowercase scheme and protocol
*/
function yourls_normalize_uri( $url ) {
$scheme = yourls_get_protocol( $url );
if ('' == $scheme) {
// Scheme not found, malformed URL? Something else? Not sure.
return $url;
}
/**
* Case 1 : scheme like "stuff:", as opposed to "stuff://"
* Examples: "mailto:joe@joe.com" or "bitcoin:15p1o8vnWqNkJBJGgwafNgR1GCCd6EGtQR?amount=1&label=Ozh"
* In this case, we only lowercase the scheme, because depending on it, things after should or should not be lowercased
*/
if (substr($scheme, -2, 2) != '//') {
$url = str_replace( $scheme, strtolower( $scheme ), $url );
return $url;
}
/**
* Case 2 : scheme like "stuff://" (eg "http://example.com/" or "ssh://joe@joe.com")
* Here we lowercase the scheme and domain parts
*/
$parts = parse_url($url);
// Most likely malformed stuff, could not parse : we'll just lowercase the scheme and leave the rest untouched
if (false == $parts) {
$url = str_replace( $scheme, strtolower( $scheme ), $url );
return $url;
}
// URL seems parsable, let's do the best we can
$lower = array();
$lower['scheme'] = strtolower( $parts['scheme'] );
if( isset( $parts['host'] ) ) {
// Convert domain to lowercase, with mb_ to preserve UTF8
$lower['host'] = mb_strtolower($parts['host']);
/**
* Convert IDN domains to their UTF8 form so that طارق.net and xn--mgbuq0c.net
* are considered the same. Explicitely mention option and variant to avoid notice
* on PHP 7.2 and 7.3
*/
$lower['host'] = idn_to_utf8($lower['host'], IDNA_DEFAULT, INTL_IDNA_VARIANT_UTS46);
}
$url = http_build_url($url, $lower);
return $url;
}
/**
* Escape single quotes, htmlspecialchar " < > &, and fix line endings. Stolen from WP.
*
* Escapes text strings for echoing in JS. It is intended to be used for inline JS
* (in a tag attribute, for example onclick="..."). Note that the strings have to
* be in single quotes. The filter 'js_escape' is also applied here.
*
* @since 1.6
*
* @param string $text The text to be escaped.
* @return string Escaped text.
*/
function yourls_esc_js( $text ) {
$safe_text = yourls_check_invalid_utf8( $text );
$safe_text = yourls_specialchars( $safe_text, ENT_COMPAT );
$safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );
$safe_text = str_replace( "\r", '', $safe_text );
$safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
return yourls_apply_filter( 'esc_js', $safe_text, $text );
}
/**
* Escaping for textarea values. Stolen from WP.
*
* @since 1.6
*
* @param string $text
* @return string
*/
function yourls_esc_textarea( $text ) {
$safe_text = htmlspecialchars( $text, ENT_QUOTES );
return yourls_apply_filter( 'esc_textarea', $safe_text, $text );
}
/**
* Adds backslashes before letters and before a number at the start of a string. Stolen from WP.
*
* @since 1.6
* @param string $string Value to which backslashes will be added.
* @return string String with backslashes inserted.
*/
function yourls_backslashit($string) {
$string = preg_replace('/^([0-9])/', '\\\\\\\\\1', (string)$string);
$string = preg_replace('/([a-z])/i', '\\\\\1', (string)$string);
return $string;
}
/**
* Check if a string seems to be urlencoded
*
* We use rawurlencode instead of urlencode to avoid messing with '+'
*
* @since 1.7
* @param string $string
* @return bool
*/
function yourls_is_rawurlencoded( $string ) {
return rawurldecode( $string ) != $string;
}
/**
* rawurldecode a string till it's not encoded anymore
*
* Deals with multiple encoding (eg "%2521" => "%21" => "!").
* See https://github.com/YOURLS/YOURLS/issues/1303
*
* @since 1.7
* @param string $string
* @return string
*/
function yourls_rawurldecode_while_encoded( $string ) {
$string = rawurldecode( $string );
if( yourls_is_rawurlencoded( $string ) ) {
$string = yourls_rawurldecode_while_encoded( $string );
}
return $string;
}
/**
* Converts readable Javascript code into a valid bookmarklet link
*
* Uses https://github.com/ozh/bookmarkletgen
*
* @since 1.7.1
* @param string $code Javascript code
* @return string Bookmarklet link
*/
function yourls_make_bookmarklet( $code ) {
$book = new \Ozh\Bookmarkletgen\Bookmarkletgen;
return $book->crunch( $code );
}
/**
* Return a timestamp, plus or minus the time offset if defined
*
* @since 1.7.10
* @param string|int $timestamp a timestamp
* @return int a timestamp, plus or minus offset if defined
*/
function yourls_get_timestamp( $timestamp ) {
$offset = yourls_get_time_offset();
$timestamp_offset = (int)$timestamp + ($offset * 3600);
return yourls_apply_filter( 'get_timestamp', $timestamp_offset, $timestamp, $offset );
}
/**
* Get time offset, as defined in config, filtered
*
* @since 1.7.10
* @return int Time offset
*/
function yourls_get_time_offset() {
$offset = defined('YOURLS_HOURS_OFFSET') ? (int)YOURLS_HOURS_OFFSET : 0;
return yourls_apply_filter( 'get_time_offset', $offset );
}
/**
* Return a date() format for a full date + time, filtered
*
* @since 1.7.10
* @param string $format Date format string
* @return string Date format string
*/
function yourls_get_datetime_format( $format ) {
return yourls_apply_filter( 'get_datetime_format', (string)$format );
}
/**
* Return a date() format for date (no time), filtered
*
* @since 1.7.10
* @param string $format Date format string
* @return string Date format string
*/
function yourls_get_date_format( $format ) {
return yourls_apply_filter( 'get_date_format', (string)$format );
}
/**
* Return a date() format for a time (no date), filtered
*
* @since 1.7.10
* @param string $format Date format string
* @return string Date format string
*/
function yourls_get_time_format( $format ) {
return yourls_apply_filter( 'get_time_format', (string)$format );
}