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<?php
/**
* Replaces double line breaks with paragraph elements.
*
* @param string $input The text which has to be formatted.
* @param bool $br Optional. If set, this will convert all remaining
* line breaks after paragraphing. Default true.
* @return string Text which has been converted into correct paragraph tags.
*/
function wpcf7_autop( $input, $br = true ) {
$placeholders = array();
// Replace non-HTML embedded elements with placeholders.
$input = preg_replace_callback(
'/<(math|svg).*?<\/\1>/is',
static function ( $matches ) use ( &$placeholders ) {
$placeholder = sprintf(
'<%1$s id="%2$s" />',
WPCF7_HTMLFormatter::placeholder_inline,
sha1( $matches[0] )
);
list( $placeholder ) =
WPCF7_HTMLFormatter::normalize_start_tag( $placeholder );
$placeholders[$placeholder] = $matches[0];
return $placeholder;
},
$input
);
$formatter = new WPCF7_HTMLFormatter( array(
'auto_br' => $br,
) );
$chunks = $formatter->separate_into_chunks( $input );
$output = $formatter->format( $chunks );
// Restore from placeholders.
$output = str_replace(
array_keys( $placeholders ),
array_values( $placeholders ),
$output
);
return $output;
}
/**
* Newline preservation help function for wpcf7_autop().
*
* @deprecated 5.7 Unnecessary to use any more.
*
* @param array $matches preg_replace_callback() matches array.
* @return string Text including newline placeholders.
*/
function wpcf7_autop_preserve_newline_callback( $matches ) {
return str_replace( "\n", '<WPPreserveNewline />', $matches[0] );
}
/**
* Sanitizes the query variables.
*
* @param string $text Query variable.
* @return string Text sanitized.
*/
function wpcf7_sanitize_query_var( $text ) {
$text = wp_unslash( $text );
$text = wp_check_invalid_utf8( $text );
if ( false !== strpos( $text, '<' ) ) {
$text = wp_pre_kses_less_than( $text );
$text = wp_strip_all_tags( $text );
}
$text = preg_replace( '/%[a-f0-9]{2}/i', '', $text );
$text = preg_replace( '/ +/', ' ', $text );
$text = trim( $text, ' ' );
return $text;
}
/**
* Strips quote characters surrounding the input.
*
* @param string $text Input text.
* @return string Processed output.
*/
function wpcf7_strip_quote( $text ) {
$text = trim( $text );
if ( preg_match( '/^"(.*)"$/s', $text, $matches ) ) {
$text = $matches[1];
} elseif ( preg_match( "/^'(.*)'$/s", $text, $matches ) ) {
$text = $matches[1];
}
return $text;
}
/**
* Navigates through an array, object, or scalar, and
* strips quote characters surrounding the each value.
*
* @param mixed $input The array or string to be processed.
* @return mixed Processed value.
*/
function wpcf7_strip_quote_deep( $input ) {
if ( is_string( $input ) ) {
return wpcf7_strip_quote( $input );
}
if ( is_array( $input ) ) {
$result = array();
foreach ( $input as $key => $text ) {
$result[$key] = wpcf7_strip_quote_deep( $text );
}
return $result;
}
}
/**
* Normalizes newline characters.
*
* @param string $text Input text.
* @param string $to Optional. The newline character that is used in the output.
* @return string Normalized text.
*/
function wpcf7_normalize_newline( $text, $to = "\n" ) {
if ( ! is_string( $text ) ) {
return $text;
}
$nls = array( "\r\n", "\r", "\n" );
if ( ! in_array( $to, $nls ) ) {
return $text;
}
return str_replace( $nls, $to, $text );
}
/**
* Navigates through an array, object, or scalar, and
* normalizes newline characters in the each value.
*
* @param mixed $input The array or string to be processed.
* @param string $to Optional. The newline character that is used in the output.
* @return mixed Processed value.
*/
function wpcf7_normalize_newline_deep( $input, $to = "\n" ) {
if ( is_array( $input ) ) {
$result = array();
foreach ( $input as $key => $text ) {
$result[$key] = wpcf7_normalize_newline_deep( $text, $to );
}
return $result;
}
return wpcf7_normalize_newline( $input, $to );
}
/**
* Strips newline characters.
*
* @param string $text Input text.
* @return string Processed one-line text.
*/
function wpcf7_strip_newline( $text ) {
$text = (string) $text;
$text = str_replace( array( "\r", "\n" ), '', $text );
return trim( $text );
}
/**
* Canonicalizes text.
*
* @param string $text Input text.
* @param string|array|object $args Options.
* @return string Canonicalized text.
*/
function wpcf7_canonicalize( $text, $args = '' ) {
// for back-compat
if ( is_string( $args ) and '' !== $args
and false === strpos( $args, '=' ) ) {
$args = array(
'strto' => $args,
);
}
$args = wp_parse_args( $args, array(
'strto' => 'lower',
'strip_separators' => false,
) );
static $charset = null;
if ( ! isset( $charset ) ) {
$charset = get_option( 'blog_charset' );
$is_utf8 = in_array(
$charset,
array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' )
);
if ( $is_utf8 ) {
$charset = 'UTF-8';
}
}
$text = html_entity_decode( $text, ENT_QUOTES | ENT_HTML5, $charset );
if ( function_exists( 'mb_convert_kana' ) ) {
$text = mb_convert_kana( $text, 'asKV', $charset );
}
if ( $args['strip_separators'] ) {
$text = preg_replace( '/[\r\n\t ]+/', '', $text );
} else {
$text = preg_replace( '/[\r\n\t ]+/', ' ', $text );
}
if ( 'lower' == $args['strto'] ) {
if ( function_exists( 'mb_strtolower' ) ) {
$text = mb_strtolower( $text, $charset );
} else {
$text = strtolower( $text );
}
} elseif ( 'upper' == $args['strto'] ) {
if ( function_exists( 'mb_strtoupper' ) ) {
$text = mb_strtoupper( $text, $charset );
} else {
$text = strtoupper( $text );
}
}
$text = trim( $text );
return $text;
}
/**
* Sanitizes Contact Form 7's form unit-tag.
*
* @param string $tag Unit-tag.
* @return string Sanitized unit-tag.
*/
function wpcf7_sanitize_unit_tag( $tag ) {
$tag = preg_replace( '/[^A-Za-z0-9_-]/', '', (string) $tag );
return $tag;
}
/**
* Converts a file name to one that is not executable as a script.
*
* @param string $filename File name.
* @return string Converted file name.
*/
function wpcf7_antiscript_file_name( $filename ) {
$filename = wp_basename( $filename );
// Apply part of protection logic from sanitize_file_name().
$filename = str_replace(
array(
'?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"',
'&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}',
'%', '+', '’', '«', '»', '”', '“', chr( 0 )
),
'',
$filename
);
$filename = preg_replace( '/[\r\n\t -]+/', '-', $filename );
$filename = preg_replace( '/[\pC\pZ]+/iu', '', $filename );
$parts = explode( '.', $filename );
if ( count( $parts ) < 2 ) {
return $filename;
}
$script_pattern = '/^(php|phtml|pl|py|rb|cgi|asp|aspx)\d?$/i';
$filename = array_shift( $parts );
$extension = array_pop( $parts );
foreach ( (array) $parts as $part ) {
if ( preg_match( $script_pattern, $part ) ) {
$filename .= '.' . $part . '_';
} else {
$filename .= '.' . $part;
}
}
if ( preg_match( $script_pattern, $extension ) ) {
$filename .= '.' . $extension . '_.txt';
} else {
$filename .= '.' . $extension;
}
return $filename;
}
/**
* Masks a password with asterisks (*).
*
* @param int $right Length of right-hand unmasked text. Default 0.
* @param int $left Length of left-hand unmasked text. Default 0.
* @return string Text of masked password.
*/
function wpcf7_mask_password( $text, $right = 0, $left = 0 ) {
$length = strlen( $text );
$right = absint( $right );
$left = absint( $left );
if ( $length < $right + $left ) {
$right = $left = 0;
}
if ( $length <= 48 ) {
$masked = str_repeat( '*', $length - ( $right + $left ) );
} elseif ( $right + $left < 48 ) {
$masked = str_repeat( '*', 48 - ( $right + $left ) );
} else {
$masked = '****';
}
$left_unmasked = $left ? substr( $text, 0, $left ) : '';
$right_unmasked = $right ? substr( $text, -1 * $right ) : '';
$text = $left_unmasked . $masked . $right_unmasked;
return $text;
}
/**
* Returns an array of allowed HTML tags and attributes for a given context.
*
* @param string $context Context used to decide allowed tags and attributes.
* @return array Array of allowed HTML tags and their allowed attributes.
*/
function wpcf7_kses_allowed_html( $context = 'form' ) {
static $allowed_tags = array();
if ( isset( $allowed_tags[$context] ) ) {
return apply_filters(
'wpcf7_kses_allowed_html',
$allowed_tags[$context],
$context
);
}
$allowed_tags[$context] = wp_kses_allowed_html( 'post' );
if ( 'form' === $context ) {
$additional_tags_for_form = array(
'button' => array(
'disabled' => true,
'name' => true,
'type' => true,
'value' => true,
),
'datalist' => array(),
'fieldset' => array(
'disabled' => true,
'name' => true,
),
'input' => array(
'accept' => true,
'alt' => true,
'capture' => true,
'checked' => true,
'disabled' => true,
'list' => true,
'max' => true,
'maxlength' => true,
'min' => true,
'minlength' => true,
'multiple' => true,
'name' => true,
'placeholder' => true,
'readonly' => true,
'size' => true,
'step' => true,
'type' => true,
'value' => true,
),
'label' => array(
'for' => true,
),
'legend' => array(),
'meter' => array(
'value' => true,
'min' => true,
'max' => true,
'low' => true,
'high' => true,
'optimum' => true,
),
'optgroup' => array(
'disabled' => true,
'label' => true,
),
'option' => array(
'disabled' => true,
'label' => true,
'selected' => true,
'value' => true,
),
'output' => array(
'for' => true,
'name' => true,
),
'progress' => array(
'max' => true,
'value' => true,
),
'select' => array(
'disabled' => true,
'multiple' => true,
'name' => true,
'size' => true,
),
'textarea' => array(
'cols' => true,
'disabled' => true,
'maxlength' => true,
'minlength' => true,
'name' => true,
'placeholder' => true,
'readonly' => true,
'rows' => true,
'spellcheck' => true,
'wrap' => true,
),
);
$additional_tags_for_form = array_map(
static function ( $elm ) {
$global_attributes = array(
'aria-atomic' => true,
'aria-checked' => true,
'aria-describedby' => true,
'aria-details' => true,
'aria-disabled' => true,
'aria-hidden' => true,
'aria-invalid' => true,
'aria-label' => true,
'aria-labelledby' => true,
'aria-live' => true,
'aria-relevant' => true,
'aria-required' => true,
'aria-selected' => true,
'class' => true,
'data-*' => true,
'id' => true,
'inputmode' => true,
'role' => true,
'style' => true,
'tabindex' => true,
'title' => true,
);
return array_merge( $global_attributes, (array) $elm );
},
$additional_tags_for_form
);
$allowed_tags[$context] = array_merge(
$allowed_tags[$context],
$additional_tags_for_form
);
}
return apply_filters(
'wpcf7_kses_allowed_html',
$allowed_tags[$context],
$context
);
}
/**
* Sanitizes content for allowed HTML tags for the specified context.
*
* @param string $input Content to filter.
* @param string $context Context used to decide allowed tags and attributes.
* @return string Filtered text with allowed HTML tags and attributes intact.
*/
function wpcf7_kses( $input, $context = 'form' ) {
$output = wp_kses(
$input,
wpcf7_kses_allowed_html( $context )
);
return $output;
}
/**
* Returns a formatted string of HTML attributes.
*
* @param array $atts Associative array of attribute name and value pairs.
* @return string Formatted HTML attributes.
*/
function wpcf7_format_atts( $atts ) {
$atts_filtered = array();
foreach ( $atts as $name => $value ) {
$name = strtolower( trim( $name ) );
if ( ! preg_match( '/^[a-z_:][a-z_:.0-9-]*$/', $name ) ) {
continue;
}
static $boolean_attributes = array(
'checked',
'disabled',
'inert',
'multiple',
'readonly',
'required',
'selected',
);
if ( in_array( $name, $boolean_attributes ) and '' === $value ) {
$value = false;
}
if ( is_numeric( $value ) ) {
$value = (string) $value;
}
if ( null === $value or false === $value ) {
unset( $atts_filtered[$name] );
} elseif ( true === $value ) {
$atts_filtered[$name] = $name; // boolean attribute
} elseif ( is_string( $value ) ) {
$atts_filtered[$name] = trim( $value );
}
}
$output = '';
foreach ( $atts_filtered as $name => $value ) {
$output .= sprintf( ' %1$s="%2$s"', $name, esc_attr( $value ) );
}
return trim( $output );
}