<?php

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/**

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* Helper functions to perform various checks across the core plugin and addons.

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*

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* @since 1.8.0

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*/

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// phpcs:disable Generic.Commenting.DocComment.MissingShort

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/** @noinspection PhpUndefinedNamespaceInspection */

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/** @noinspection PhpUndefinedClassInspection */

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// phpcs:enable Generic.Commenting.DocComment.MissingShort

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use WPForms\Tasks\Tasks;

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use WPForms\Vendor\TrueBV\Punycode;

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/**

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* Check if a string is a valid URL.

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*

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* @since 1.0.0

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* @since 1.5.8 Changed the pattern used to validate the URL.

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*

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* @param string $url Input URL.

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*

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* @return bool

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* @noinspection RegExpUnnecessaryNonCapturingGroup

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* @noinspection RegExpRedundantEscape

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*/

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function wpforms_is_url( $url ): bool {

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// The pattern taken from https://gist.github.com/dperini/729294.

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// It is the best choice according to the https://mathiasbynens.be/demo/url-regex.

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$pattern = '%^(?:(?:(?:https?|ftp):)?\/\/)(?:\S+(?::\S*)?@)?(?:(?!(?:10|127)(?:\.\d{1,3}){3})(?!(?:169\.254|192\.168)(?:\.\d{1,3}){2})(?!172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2})(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[1-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z0-9\x{00a1}-\x{ffff}][a-z0-9\x{00a1}-\x{ffff}_-]{0,62})?[a-z0-9\x{00a1}-\x{ffff}]\.)+(?:[a-z\x{00a1}-\x{ffff}]{2,}\.?))(?::\d{2,5})?(?:[/?#]\S*)?$%iu';

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if ( preg_match( $pattern, trim( $url ) ) ) {

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return true;

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}

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return false;

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}

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/**

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* Verify that an email is valid.

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* See the linked RFC.

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*

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* @see https://www.rfc-editor.org/rfc/inline-errata/rfc3696.html

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*

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* @since 1.7.3

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*

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* @param string $email Email address to verify.

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*

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* @return string|false Returns a valid email address on success, false on failure.

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*/

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function wpforms_is_email( $email ) { // phpcs:ignore Generic.Metrics.CyclomaticComplexity.TooHigh

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static $punycode;

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// Do not allow callables, arrays, and objects.

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if ( ! is_scalar( $email ) ) {

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return false;

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}

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// Allow smart tags in the email address.

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if ( preg_match( '/{.+?}/', $email ) ) {

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return $email;

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}

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// Email can't be longer than 254 octets,

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// otherwise it can't be used to send an email address (limitation in the MAIL and RCPT commands).

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// 1 octet = 8 bits = 1 byte.

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if ( strlen( $email ) > 254 ) {

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return false;

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}

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$email_arr = explode( '@', $email );

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if ( count( $email_arr ) !== 2 ) {

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return false;

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}

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[ $local, $domain ] = $email_arr;

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/**

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* RFC requires local part to be no longer than 64 octets.

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* Punycode library checks for 63 octets.

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*

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* @link https://github.com/true/php-punycode/blob/master/src/Punycode.php#L182.

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*/

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if ( strlen( $local ) > 63 ) {

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return false;

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}

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$domain_arr = explode( '.', $domain );

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foreach ( $domain_arr as $domain_label ) {

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$domain_label = trim( $domain_label );

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if ( ! $domain_label ) {

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return false;

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}

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// The RFC says: 'A DNS label may be no more than 63 octets long'.

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if ( strlen( $domain_label ) > 63 ) {

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return false;

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}

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}

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if ( ! $punycode ) {

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$punycode = new Punycode();

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}

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/**

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* The wp_mail() uses phpMailer, which uses is_email() as verification callback.

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* For verification, phpMailer sends the email address where the domain part is punycode encoded only.

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* We follow here the same principle.

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*/

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$email_check = $local . '@' . $punycode->encode( $domain );

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// Other limitations are checked by the native WordPress function is_email().

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return is_email( $email_check ) ? $local . '@' . $domain : false;

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}

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/**

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* Check whether the string is json-encoded.

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*

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* @since 1.7.5

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*

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* @param string $value A string.

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*

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* @return bool

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*/

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function wpforms_is_json( $value ): bool {

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return (

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is_string( $value ) &&

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is_array( json_decode( $value, true ) ) &&

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json_last_error() === JSON_ERROR_NONE

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);

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}

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/**

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* Check whether the current page is in AMP mode or not.

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* We need to check for specific functions, as there is no special AMP header.

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*

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* @since 1.4.1

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*

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* @param bool $check_theme_support Whether theme support should be checked. Defaults to true.

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*

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* @return bool

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*/

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function wpforms_is_amp( $check_theme_support = true ): bool {

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$is_amp = false;

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// Check for AMP by AMP Project Contributors.

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if ( function_exists( 'amp_is_request' ) && amp_is_request() ) {

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$is_amp = true;

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}

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if ( $is_amp && $check_theme_support ) {

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$is_amp = current_theme_supports( 'amp' );

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}

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/**

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* Filters AMP flag.

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*

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* @since 1.4.1

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*

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* @param bool $is_amp Current page AMP status.

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*

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* @return bool

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*/

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return (bool) apply_filters( 'wpforms_is_amp', $is_amp );

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}

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/**

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* Helper function to determine if loading on WPForms related admin page.

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*

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* Here we determine if the current administration page is owned/created by

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* WPForms. This is done in compliance with WordPress best practices for

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* development, so that we only load required WPForms CSS and JS files on pages

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* we create. As a result, we do not load our assets admin wide, where they might

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* conflict with other plugins needlessly, also leading to a better, faster user

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* experience for our users.

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*

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* @since 1.3.9

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*

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* @param string $slug Slug identifier for a specific WPForms admin page.

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* @param string $view Slug identifier for a specific WPForms admin page view ("subpage").

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*

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* @return bool

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*/

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function wpforms_is_admin_page( $slug = '', $view = '' ): bool {

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// phpcs:disable WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash

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// Check against basic requirements.

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if (

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empty( $_REQUEST['page'] ) ||

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strpos( $_REQUEST['page'], 'wpforms' ) === false ||

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! is_admin()

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) {

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return false;

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}

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// Check against page slug identifier.

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if (

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( ! empty( $slug ) && $_REQUEST['page'] !== 'wpforms-' . $slug ) ||

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( empty( $slug ) && $_REQUEST['page'] === 'wpforms-builder' )

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) {

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return false;

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}

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// Check against sub-level page view.

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if (

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! empty( $view ) &&

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( empty( $_REQUEST['view'] ) || $_REQUEST['view'] !== $view )

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) {

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return false;

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}

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// phpcs:enable WordPress.Security.NonceVerification.Recommended, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized, WordPress.Security.ValidatedSanitizedInput.MissingUnslash

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return true;

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}

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/**

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* Check if a string is empty.

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*

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* @since 1.5.0

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*

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* @param string $value String to test.

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*

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* @return bool

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*/

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function wpforms_is_empty_string( $value ): bool {

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// phpcs:ignore WPForms.Formatting.EmptyLineBeforeReturn.RemoveEmptyLineBeforeReturnStatement

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return $value === '';

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}

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/**

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* Determine if the request is a rest API call.

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*

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* Case #1: After WP_REST_Request initialization

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* Case #2: Support "plain" permalink settings

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* Case #3: It can happen that WP_Rewrite is not yet initialized,

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* so do this (wp-settings.php)

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* Case #4: URL Path begins with wp-json/ (your REST prefix)

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* Also supports WP installations in sub folders

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*

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* @since 1.8.8

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*

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* @return bool True if the request is a REST API call, false if not.

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* @author matzeeable

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*/

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function wpforms_is_rest(): bool {

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if ( ! isset( $_SERVER['REQUEST_URI'] ) ) {

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return false;

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}

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// Case #1.

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if ( defined( 'REST_REQUEST' ) && constant( 'REST_REQUEST' ) ) {

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return true;

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}

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// Case #2.

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// phpcs:ignore WordPress.Security.NonceVerification.Recommended

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$rest_route = isset( $_GET['rest_route'] ) ?

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filter_input( INPUT_GET, 'rest_route', FILTER_SANITIZE_FULL_SPECIAL_CHARS ) :

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'';

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if ( strpos( trim( $rest_route, '\\/' ), rest_get_url_prefix() ) === 0 ) {

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return true;

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}

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// Case #3.

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global $wp_rewrite;

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if ( $wp_rewrite === null ) {

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// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited

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$wp_rewrite = new WP_Rewrite();

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}

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// Case #4.

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$current_url = (string) wp_parse_url( add_query_arg( [] ), PHP_URL_PATH );

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$rest_url = wp_parse_url( trailingslashit( rest_url() ), PHP_URL_PATH );

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return strpos( $current_url, $rest_url ) === 0;

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}

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/**

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* Determine if the request is a WPForms related rest API call.

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*

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* NOTE: The function shouldn't be used before the `rest_api_init` action.

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*

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* @since 1.9.6.1

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*

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* @return bool True if the request is a WPForms related rest API call, false if not.

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*/

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function wpforms_is_wpforms_rest(): bool {

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if ( ! wpforms_is_rest() ) {

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return false;

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}

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$rest_url = wp_parse_url( trailingslashit( rest_url() ) );

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$current_url = wp_parse_url( trailingslashit( wpforms_current_url() ) );

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$rest_url['path'] = $rest_url['path'] ?? '';

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// phpcs:disable WordPress.Security.NonceVerification.Recommended

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$is_rest_plain = $rest_url['path'] === '/index.php' && ! empty( $_GET['rest_route'] );

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$is_rest_post_name = strpos( $rest_url['path'], '/wp-json/' ) !== false;

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if ( $is_rest_plain ) {

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$rest_route = sanitize_text_field( wp_unslash( $_GET['rest_route'] ) );

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return strpos( $rest_route, '/wpforms/' ) !== false;

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}

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// phpcs:enable WordPress.Security.NonceVerification.Recommended

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if ( $is_rest_post_name ) {

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return strpos( $current_url['path'] ?? '', '/wpforms/' ) !== false;

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}

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return false;

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}

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/**

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* Determine if the request is WPForms AJAX.

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*

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* @since 1.8.0

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* @since 1.9.1 Added an optional parameter to check for a specific action.

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*

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* @param string $action Certain AJAX action to check. Optional. Default is empty.

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*

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* @return bool

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*/

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function wpforms_is_ajax( string $action = '' ): bool {

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if ( ! wp_doing_ajax() ) {

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return false;

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}

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// Make sure the request target is admin-ajax.php.

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// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized

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if ( isset( $_SERVER['SCRIPT_FILENAME'] ) && basename( sanitize_text_field( wp_normalize_path( $_SERVER['SCRIPT_FILENAME'] ) ) ) !== 'admin-ajax.php' ) {

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return false;

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}

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// phpcs:ignore WordPress.Security.NonceVerification.Recommended

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$request_action = isset( $_REQUEST['action'] ) ? sanitize_key( $_REQUEST['action'] ) : '';

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$is_wpforms_action = strpos( $request_action, 'wpforms_' ) === 0;

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if ( empty( $action ) ) {

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return $is_wpforms_action;

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}

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return $is_wpforms_action && $action === $request_action;

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}

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/**

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* Determine if request is frontend AJAX.

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*

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* @since 1.5.8.2

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* @since 1.6.5 Added filterable frontend ajax actions list as a fallback to missing referer cases.

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* @since 1.6.7.1 Removed a requirement for an AJAX action to be a WPForms action if referer is not missing.

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* @since 1.8.0 Added clear separation between frontend and admin AJAX requests, see `wpforms_is_admin_ajax()`.

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*

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* @return bool

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*/

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function wpforms_is_frontend_ajax(): bool {

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if ( wpforms_is_ajax() && ! wpforms_is_admin_ajax() ) {

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return true;

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}

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// Try detecting a frontend AJAX call indirectly by comparing the current action

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// with a known frontend actions list in case there's no HTTP referer.

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$ref = wp_get_raw_referer();

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if ( $ref ) {

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return false;

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}

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$frontend_actions = [

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'wpforms_submit',

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'wpforms_file_upload_speed_test',

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'wpforms_upload_chunk_init',

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'wpforms_upload_chunk',

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'wpforms_file_chunks_uploaded',

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'wpforms_remove_file',

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'wpforms_restricted_email',

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'wpforms_form_locker_unique_answer',

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'wpforms_form_abandonment',

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];

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// phpcs:ignore WordPress.Security.NonceVerification.Recommended

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$action = isset( $_REQUEST['action'] ) ? sanitize_key( $_REQUEST['action'] ) : '';

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/**

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* Allow modifying the list of frontend AJAX actions.

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*

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* This filter may be running as early as `plugins_loaded` hook.

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* Please mind the hook order when using it.

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*

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* @since 1.6.5

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*

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* @param array $frontend_actions A list of frontend actions.

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*/

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$frontend_actions = (array) apply_filters( 'wpforms_is_frontend_ajax_frontend_actions', $frontend_actions );

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return in_array( $action, $frontend_actions, true );

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}

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/**

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* Determine if request is admin AJAX.

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*

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* @since 1.8.0

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*

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* @return bool

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*/

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function wpforms_is_admin_ajax(): bool {

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if ( ! wpforms_is_ajax() ) {

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return false;

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}

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$ref = wp_get_raw_referer();

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if ( ! $ref ) {

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return false;

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}

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$path = wp_parse_url( $ref, PHP_URL_PATH );

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$admin_path = wp_parse_url( admin_url(), PHP_URL_PATH );

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// Is an admin AJAX call if HTTP referer contain an admin path.

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return strpos( $path, $admin_path ) !== false;

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}

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/**

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* Check if Gutenberg is active.

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*

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* @since 1.6.2

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*

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* @return bool True if Gutenberg is active.

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* @noinspection PhpUndefinedFunctionInspection

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*/

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function wpforms_is_gutenberg_active(): bool {

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require_once ABSPATH . 'wp-admin/includes/plugin.php';

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if ( is_plugin_active( 'classic-editor/classic-editor.php' ) ) {

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return in_array( get_option( 'classic-editor-replace' ), [ 'no-replace', 'block' ], true );

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}

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if ( is_plugin_active( 'disable-gutenberg/disable-gutenberg.php' ) ) {

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return ! disable_gutenberg();

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}

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return true;

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}

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/**

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* Check if website support Divi Builder.

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*

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* @since 1.9.2.3

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*

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* @return bool True if Divi builder plugin or Divi or Extra theme is active.

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*/

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function wpforms_is_divi_active(): bool {

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if ( function_exists( 'et_divi_builder_init_plugin' ) ) {

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return true;

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}

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$allow_themes = [ 'Divi', 'Extra' ];

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$theme_name = get_template();

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return in_array( $theme_name, $allow_themes, true );

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}

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[481] Fix | Delete

/**

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* Determines whether the current request is a WP CLI request.

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*

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* @since 1.7.6

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*

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* @return bool

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*/

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function wpforms_doing_wp_cli(): bool {

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return defined( 'WP_CLI' ) && WP_CLI;

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}

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[493] Fix | Delete

/**

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* Determines whether the Action Scheduler task is executing.

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*

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* @since 1.9.4

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*

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* @return bool

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