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<?php
/**
* Helper functions to clean and sanitize data, escape it and prepare the output.
*
* @since 1.8.0
*/
use WPForms\Helpers\Templates;
/**
* Decode special characters, both alpha- (<) and numeric-based (').
* Sanitize recursively, preserve new lines.
* Handle all the possible mixed variations of < and `<` that can be processed into tags.
*
* @since 1.4.1
* @since 1.6.0 Sanitize recursively, preserve new lines.
*
* @param string $string Raw string to decode.
*
* @return string
*/
function wpforms_decode_string( $string ) {
if ( ! is_string( $string ) ) {
return $string;
}
/*
* Sanitization should be done first, so tags are stripped and < is converted to < etc.
* This iteration may do nothing when the string already comes with < and > only.
*/
$string = wpforms_sanitize_text_deeply( $string, true );
// Now we need to convert the string without tags: < back to < (same for quotes).
$string = wp_kses_decode_entities( html_entity_decode( $string, ENT_QUOTES ) );
// And now we need to sanitize AGAIN, to avoid unwanted tags that appeared after decoding.
return wpforms_sanitize_text_deeply( $string, true );
}
/**
* Sanitize key, primarily used for looking up options.
*
* @since 1.3.9
*
* @param string $key Key name.
*
* @return string
*/
function wpforms_sanitize_key( $key = '' ) {
return preg_replace( '/[^a-zA-Z0-9_\-\.\:\/]/', '', $key );
}
/**
* Sanitize hex color.
*
* @since 1.2.1
*
* @param string $color Color value.
*
* @return string
*/
function wpforms_sanitize_hex_color( $color ) {
if ( empty( $color ) ) {
return '';
}
// 3 or 6 hex digits, or the empty string.
if ( preg_match( '|^#([A-Fa-f0-9]{3}){1,2}$|', $color ) ) {
return $color;
}
return '';
}
/**
* Sanitize error message, primarily used during form frontend output.
*
* @since 1.3.7
* @since 1.7.6 Expand list of allowed HTML tags and attributes.
*
* @param string $error Error message.
*
* @return string
*/
function wpforms_sanitize_error( $error = '' ) {
$allow = [
'a' => [
'href' => [],
'title' => [],
'target' => [],
'rel' => [],
],
'br' => [],
'em' => [],
'strong' => [],
'del' => [],
'p' => [
'style' => [],
],
'blockquote' => [],
'ul' => [],
'ol' => [],
'li' => [],
'span' => [
'style' => [],
],
];
return wp_kses( $error, $allow );
}
/**
* Sanitize a string, that can be a multiline.
*
* @uses wpforms_sanitize_text_deeply()
*
* @since 1.4.1
*
* @param string $string String to deeply sanitize.
*
* @return string Sanitized string, or empty string if not a string provided.
*/
function wpforms_sanitize_textarea_field( $string ) {
return wpforms_sanitize_text_deeply( $string, true );
}
/**
* Deeply sanitize the string, preserve newlines if needed.
* Prevent maliciously prepared strings from containing HTML tags.
*
* @since 1.6.0
*
* @param string $string String to deeply sanitize.
* @param bool $keep_newlines Whether to keep newlines. Default: false.
*
* @return string Sanitized string, or empty string if not a string provided.
*/
function wpforms_sanitize_text_deeply( $string, $keep_newlines = false ) {
if ( is_object( $string ) || is_array( $string ) ) {
return '';
}
$string = (string) $string;
$keep_newlines = (bool) $keep_newlines;
$new_value = _sanitize_text_fields( $string, $keep_newlines );
if ( strlen( $new_value ) !== strlen( $string ) ) {
$new_value = wpforms_sanitize_text_deeply( $new_value, $keep_newlines );
}
return $new_value;
}
/**
* Sanitize an HTML string with a set of allowed HTML tags.
*
* @since 1.7.0
*
* @param string $value String to sanitize.
*
* @return string Sanitized string.
*/
function wpforms_sanitize_richtext_field( $value ) {
$count = 1;
$value = convert_invalid_entities( $value );
// Remove 'script' and 'style' tags recursively.
while ( $count ) {
$value = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $value, - 1, $count );
}
// Make sure we have allowed tags only.
$value = wp_kses( $value, wpforms_get_allowed_html_tags_for_richtext_field() );
// Make sure that all tags are balanced.
return force_balance_tags( $value );
}
/**
* Escaping for Rich Text field values.
*
* @since 1.7.0
* @since 1.9.1 Removed new lines after adding paragraphs and breaks tags.
*
* @param string $value Text to escape.
*
* @return string Escaped text.
*/
function wpforms_esc_richtext_field( $value ) {
$value = wpautop( wpforms_sanitize_richtext_field( $value ) );
return trim( str_replace( [ "\r\n", "\r", "\n" ], '', $value ) );
}
/**
* Retrieve allowed HTML tags for Rich Text field.
*
* @since 1.7.0
*
* @return array Array of allowed tags.
*/
function wpforms_get_allowed_html_tags_for_richtext_field() {
$allowed_tags = array_fill_keys(
[
'img',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'p',
'a',
'ul',
'ol',
'li',
'dl',
'dt',
'dd',
'hr',
'br',
'code',
'pre',
'strong',
'b',
'em',
'i',
'blockquote',
'cite',
'q',
'del',
'span',
'small',
'table',
'thead',
'tbody',
'tfoot',
'th',
'tr',
'td',
'abbr',
'address',
'sub',
'sup',
'ins',
'figure',
'figcaption',
'caption',
'div',
],
array_fill_keys(
[ 'align', 'class', 'id', 'style', 'src', 'rel', 'alt', 'href', 'target', 'width', 'height', 'title', 'cite', 'start', 'reversed', 'datetime', 'scope', 'colspan', 'rowspan' ],
[]
)
);
/**
* Allowed HTML tags for Rich Text field.
*
* @since 1.7.0
*
* @param array $allowed_tags Allowed HTML tags.
*/
$tags = (array) apply_filters( 'wpforms_get_allowed_html_tags_for_richtext_field', $allowed_tags );
// Force unset iframes, script and style no matter when we get back
// from apply_filters, as they are a huge security risk.
unset( $tags['iframe'], $tags['script'], $tags['style'] );
return $tags;
}
/**
* Sanitize an array, that consists of values as strings.
* After that - merge all array values into multiline string.
*
* @since 1.4.1
*
* @param array $array Data to sanitize.
*
* @return mixed If not an array is passed (or empty var) - return unmodified var. Otherwise - a merged array into multiline string.
*/
function wpforms_sanitize_array_combine( $array ) {
if ( empty( $array ) || ! is_array( $array ) ) {
return $array;
}
return implode( "\n", array_map( 'sanitize_text_field', $array ) );
}
/**
* Format, sanitize, and return/echo HTML element ID, classes, attributes,
* and data attributes.
*
* @since 1.3.7
*
* @param string $id HTML id attribute value.
* @param array $class A list of classnames for the class attribute.
* @param array $datas Data attributes.
* @param array $atts Any additional HTML attributes and their values.
* @param bool $echo Whether to echo the output or just return it. Defaults to return.
*
* @return string|void
*/
function wpforms_html_attributes( $id = '', $class = [], $datas = [], $atts = [], $echo = false ) {
$id = trim( $id );
$parts = [];
if ( ! empty( $id ) ) {
$id = sanitize_html_class( $id );
if ( ! empty( $id ) ) {
$parts[] = 'id="' . $id . '"';
}
}
if ( ! empty( $class ) ) {
$class = wpforms_sanitize_classes( $class, true );
if ( ! empty( $class ) ) {
$parts[] = 'class="' . $class . '"';
}
}
if ( ! empty( $datas ) ) {
foreach ( $datas as $data => $val ) {
$parts[] = 'data-' . sanitize_html_class( $data ) . '="' . esc_attr( $val ) . '"';
}
}
if ( ! empty( $atts ) ) {
foreach ( $atts as $att => $val ) {
if ( '0' === (string) $val || ! empty( $val ) ) {
if ( $att[0] === '[' ) {
// Handle special case for bound attributes in AMP.
$escaped_att = '[' . sanitize_html_class( trim( $att, '[]' ) ) . ']';
} else {
$escaped_att = sanitize_html_class( $att );
}
$parts[] = $escaped_att . '="' . esc_attr( $val ) . '"';
}
}
}
$output = implode( ' ', $parts );
if ( $echo ) {
echo trim( $output ); // phpcs:ignore
} else {
return trim( $output );
}
}
/**
* Sanitize string of CSS classes.
*
* @since 1.2.1
*
* @param array|string $classes CSS classes.
* @param bool $convert True will convert strings to array and vice versa.
*
* @return string|array
*/
function wpforms_sanitize_classes( $classes, $convert = false ) {
$array = is_array( $classes );
$css = [];
if ( ! empty( $classes ) ) {
if ( ! $array ) {
$classes = explode( ' ', trim( $classes ) );
}
foreach ( array_unique( $classes ) as $class ) {
if ( ! empty( $class ) ) {
$css[] = sanitize_html_class( $class );
}
}
}
if ( $array ) {
return $convert ? implode( ' ', $css ) : $css;
}
return $convert ? $css : implode( ' ', $css );
}
/**
* Include a template - alias to \WPForms\Helpers\Template::get_html.
* Use 'require' if $args are passed or 'load_template' if not.
*
* @since 1.5.6
*
* @param string $template_name Template name.
* @param array $args Arguments.
* @param bool $extract Extract arguments.
*
* @throws RuntimeException If extract() tries to modify the scope.
*
* @return string Compiled HTML.
*/
function wpforms_render( $template_name, $args = [], $extract = false ) {
return Templates::get_html( $template_name, $args, $extract );
}
/**
* Alias for default readonly function.
*
* @since 1.6.9
*
* @param mixed $readonly One of the values to compare.
* @param mixed $current The other value to compare if not just true.
* @param bool $echo Whether to echo or just return the string.
*
* @return string HTML attribute or empty string.
*/
function wpforms_readonly( $readonly, $current = true, $echo = true ) {
if ( function_exists( 'wp_readonly' ) ) {
return wp_readonly( $readonly, $current, $echo );
}
return __checked_selected_helper( $readonly, $current, $echo, 'readonly' );
}
/**
* Get the required label text, with a filter.
*
* @since 1.4.4
*
* @return string
*/
function wpforms_get_required_label() {
return apply_filters( 'wpforms_required_label', esc_html__( 'This field is required.', 'wpforms-lite' ) );
}
/**
* Get the required field label HTML, with a filter.
*
* @since 1.4.8
*
* @return string
*/
function wpforms_get_field_required_label() {
$label_html = apply_filters_deprecated(
'wpforms_field_required_label',
[ ' <span class="wpforms-required-label">*</span>' ],
'1.4.8 of the WPForms plugin',
'wpforms_get_field_required_label'
);
return apply_filters( 'wpforms_get_field_required_label', $label_html );
}
/**
* Escape unselected choices for radio/checkbox fields.
*
* @since 1.8.3
*
* @param string $formatted_field HTML field.
*
* @return string
*/
function wpforms_esc_unselected_choices( $formatted_field ) {
$allowed_html = wp_kses_allowed_html( 'post' );
$allowed_html['input'] = [
'type' => [],
'disabled' => [],
'checked' => [],
];
$allowed_html['label'] = [];
return wp_kses( $formatted_field, $allowed_html );
}
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