- File: checks.php
- Full Path: /home/matthif/www/wp-content/plugins/wpforms-lite/includes/functions/checks.php
- Date Modified: 02/16/2024 11:45 AM
- File size: 10.01 KB
- MIME-type: text/x-php
- Charset: utf-8
<?php
/**
* Helper functions to perform various checks across the core plugin and addons.
*
* @since 1.8.0
*/
use WPForms\Vendor\TrueBV\Punycode;
/**
* Check if a string is a valid URL.
*
* @since 1.0.0
* @since 1.5.8 Changed the pattern used to validate the URL.
*
* @param string $url Input URL.
*
* @return bool
*/
function wpforms_is_url( $url ) {
// The pattern taken from https://gist.github.com/dperini/729294.
// It is the best choice according to the https://mathiasbynens.be/demo/url-regex.
$pattern = '%^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z0-9\x{00a1}-\x{ffff}][a-z0-9\x{00a1}-\x{ffff}_-]{0,62})?[a-z0-9\x{00a1}-\x{ffff}]\.)+(?:[a-z\x{00a1}-\x{ffff}]{2,}\.?))(?::\d{2,5})?(?:[/?#]\S*)?$%iu';
if ( preg_match( $pattern, trim( $url ) ) ) {
return true;
}
return false;
}
/**
* Verify that an email is valid.
* See the linked RFC.
*
* @see https://www.rfc-editor.org/rfc/inline-errata/rfc3696.html
*
* @since 1.7.3
*
* @param string $email Email address to verify.
*
* @return string|false Returns a valid email address on success, false on failure.
*/
function wpforms_is_email( $email ) { // phpcs:ignore Generic.Metrics.CyclomaticComplexity.TooHigh
static $punycode;
// Do not allow callables, arrays and objects.
if ( ! is_scalar( $email ) ) {
return false;
}
// Allow smart tags in the email address.
if ( preg_match( '/{.+?}/', $email ) ) {
return $email;
}
// Email can't be longer than 254 octets,
// otherwise it can't be used to send an email address (limitation in the MAIL and RCPT commands).
// 1 octet = 8 bits = 1 byte.
if ( strlen( $email ) > 254 ) {
return false;
}
$email_arr = explode( '@', $email );
if ( count( $email_arr ) !== 2 ) {
return false;
}
list( $local, $domain ) = $email_arr;
/**
* RFC requires local part to be no longer than 64 octets.
* Punycode library checks for 63 octets.
*
* @link https://github.com/true/php-punycode/blob/master/src/Punycode.php#L182.
*/
if ( strlen( $local ) > 63 ) {
return false;
}
$domain_arr = explode( '.', $domain );
foreach ( $domain_arr as $domain_label ) {
$domain_label = trim( $domain_label );
if ( ! $domain_label ) {
return false;
}
// The RFC says: 'A DNS label may be no more than 63 octets long'.
if ( strlen( $domain_label ) > 63 ) {
return false;
}
}
if ( ! $punycode ) {
$punycode = new Punycode();
}
/**
* The wp_mail() uses phpMailer, which uses is_email() as verification callback.
* For verification, phpMailer sends the email address where the domain part is punycode encoded only.
* We follow here the same principle.
*/
$email_check = $local . '@' . $punycode->encode( $domain );
// Other limitations are checked by the native WordPress function is_email().
return is_email( $email_check ) ? $local . '@' . $domain : false;
}
/**
* Check whether the string is json-encoded.
*
* @since 1.7.5
*
* @param string $string A string.
*
* @return bool
*/
function wpforms_is_json( $string ) {
return (
is_string( $string ) &&
is_array( json_decode( $string, true ) ) &&
json_last_error() === JSON_ERROR_NONE
);
}
/**
* Check whether the current page is in AMP mode or not.
* We need to check for specific functions, as there is no special AMP header.
*
* @since 1.4.1
*
* @param bool $check_theme_support Whether theme support should be checked. Defaults to true.
*
* @return bool
*/
function wpforms_is_amp( $check_theme_support = true ) {
$is_amp = false;
if (
// AMP by Automattic; ampforwp.
( function_exists( 'is_amp_endpoint' ) && is_amp_endpoint() ) ||
// Better AMP.
( function_exists( 'is_better_amp' ) && is_better_amp() )
) {
$is_amp = true;
}
if ( $is_amp && $check_theme_support ) {
$is_amp = current_theme_supports( 'amp' );
}
return apply_filters( 'wpforms_is_amp', $is_amp );
}
/**
* Helper function to determine if loading on WPForms related admin page.
*
* Here we determine if the current administration page is owned/created by
* WPForms. This is done in compliance with WordPress best practices for
* development, so that we only load required WPForms CSS and JS files on pages
* we create. As a result we do not load our assets admin wide, where they might
* conflict with other plugins needlessly, also leading to a better, faster user
* experience for our users.
*
* @since 1.3.9
*
* @param string $slug Slug identifier for a specific WPForms admin page.
* @param string $view Slug identifier for a specific WPForms admin page view ("subpage").
*
* @return bool
*/
function wpforms_is_admin_page( $slug = '', $view = '' ) {
// phpcs:disable WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash
// Check against basic requirements.
if (
! is_admin() ||
empty( $_REQUEST['page'] ) ||
strpos( $_REQUEST['page'], 'wpforms' ) === false
) {
return false;
}
// Check against page slug identifier.
if (
( ! empty( $slug ) && $_REQUEST['page'] !== 'wpforms-' . $slug ) ||
( empty( $slug ) && $_REQUEST['page'] === 'wpforms-builder' )
) {
return false;
}
// Check against sub-level page view.
if (
! empty( $view ) &&
( empty( $_REQUEST['view'] ) || $_REQUEST['view'] !== $view )
) {
return false;
}
// phpcs:enable WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash
return true;
}
/**
* Check if a string is empty.
*
* @since 1.5.0
*
* @param string $string String to test.
*
* @return bool
*/
function wpforms_is_empty_string( $string ) {
return is_string( $string ) && $string === '';
}
/**
* Determine if the request is WPForms AJAX.
*
* @since 1.8.0
*
* @return bool
*/
function wpforms_is_ajax() {
if ( ! wp_doing_ajax() ) {
return false;
}
// Make sure the request targets admin-ajax.php.
if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && basename( sanitize_text_field( wp_unslash( $_SERVER['SCRIPT_FILENAME'] ) ) ) !== 'admin-ajax.php' ) {
return false;
}
// phpcs:ignore WordPress.Security.NonceVerification.Recommended
$action = isset( $_REQUEST['action'] ) ? sanitize_key( $_REQUEST['action'] ) : '';
return strpos( $action, 'wpforms_' ) === 0;
}
/**
* Determine if request is frontend AJAX.
*
* @since 1.5.8.2
* @since 1.6.5 Added filterable frontend ajax actions list as a fallback to missing referer cases.
* @since 1.6.7.1 Removed a requirement for an AJAX action to be a WPForms action if referer is not missing.
* @since 1.8.0 Added clear separation between frontend and admin AJAX requests, see `wpforms_is_admin_ajax()`.
*
* @return bool
*/
function wpforms_is_frontend_ajax() {
if ( wpforms_is_ajax() && ! wpforms_is_admin_ajax() ) {
return true;
}
// Try detecting a frontend AJAX call indirectly by comparing the current action
// with a known frontend actions list in case there's no HTTP referer.
$ref = wp_get_raw_referer();
if ( $ref ) {
return false;
}
$frontend_actions = [
'wpforms_submit',
'wpforms_file_upload_speed_test',
'wpforms_upload_chunk_init',
'wpforms_upload_chunk',
'wpforms_file_chunks_uploaded',
'wpforms_remove_file',
'wpforms_restricted_email',
'wpforms_form_locker_unique_answer',
'wpforms_form_abandonment',
];
// phpcs:ignore WordPress.Security.NonceVerification.Recommended
$action = isset( $_REQUEST['action'] ) ? sanitize_key( $_REQUEST['action'] ) : '';
/**
* Allow modifying the list of frontend AJAX actions.
*
* This filter may be running as early as `plugins_loaded` hook.
* Please mind the hooks order when using it.
*
* @since 1.6.5
*
* @param array $frontend_actions A list of frontend actions.
*/
$frontend_actions = (array) apply_filters( 'wpforms_is_frontend_ajax_frontend_actions', $frontend_actions );
return in_array( $action, $frontend_actions, true );
}
/**
* Determine if request is admin AJAX.
*
* @since 1.8.0
*
* @return bool
*/
function wpforms_is_admin_ajax() {
if ( ! wpforms_is_ajax() ) {
return false;
}
$ref = wp_get_raw_referer();
if ( ! $ref ) {
return false;
}
$path = wp_parse_url( $ref, PHP_URL_PATH );
$admin_path = wp_parse_url( admin_url(), PHP_URL_PATH );
// Is an admin AJAX call if HTTP referer contain an admin path.
return strpos( $path, $admin_path ) !== false;
}
/**
* Check if Gutenberg is active.
*
* @since 1.6.2
*
* @return bool True if Gutenberg is active.
*/
function wpforms_is_gutenberg_active() {
$gutenberg = false;
$block_editor = false;
if ( has_filter( 'replace_editor', 'gutenberg_init' ) ) {
// Gutenberg is installed and activated.
$gutenberg = true;
}
if ( version_compare( $GLOBALS['wp_version'], '5.0-beta', '>' ) ) {
// Block editor.
$block_editor = true;
}
if ( ! $gutenberg && ! $block_editor ) {
return false;
}
include_once ABSPATH . 'wp-admin/includes/plugin.php';
if ( is_plugin_active( 'disable-gutenberg/disable-gutenberg.php' ) ) {
return ! disable_gutenberg();
}
if ( is_plugin_active( 'classic-editor/classic-editor.php' ) ) {
return get_option( 'classic-editor-replace' ) === 'block';
}
return true;
}
/**
* Determines whether the current request is a WP CLI request.
*
* @since 1.7.6
*
* @return bool
*/
function wpforms_doing_wp_cli() {
return defined( 'WP_CLI' ) && WP_CLI;
}
/**
* Determines whether search functionality is enabled for Choices.js elements in the admin area.
*
* @since 1.8.3
*
* @param array $data Data to be displayed in the dropdown.
*
* @return string
*/
function wpforms_choices_js_is_search_enabled( $data ) {
/**
* Filter max amount of items at which no search box is displayed.
*
* @since 1.8.3
*
* @param int $count Max items count.
*/
return count( $data ) >= apply_filters( 'wpforms_choices_js_is_search_enabled_max_limit', 20 ) ? 'true' : 'false';
}