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<?php

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namespace StringLocator\Tests;

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class Loopback {

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/**

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* An array of HTTP status codes that will trigger the rollback feature.

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* @var string[]

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private $bad_http_codes = array( '500' );

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/**

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* An array holding any errors returned during testing.

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* @var array

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public $errors = array();

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/**

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* Loopback constructor.

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public function __construct() {

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add_action( 'string_locator_editor_checks', array( $this, 'print_checks_option' ) );

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add_filter( 'string_locator_post_save', array( $this, 'maybe_perform_test' ) );

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add_filter( 'string_locator_post_save_fail_notice', array( $this, 'return_failure_notices' ) );

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}

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public function return_failure_notices( $notices ) {

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if ( empty( $this->errors ) ) {

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return $notices;

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}

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return array_merge(

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$notices,

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$this->errors

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);

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}

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public function maybe_perform_test( $save_successful ) {

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// If another addon has determined the save is a failure, don't perform the test.

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if ( ! $save_successful ) {

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return $save_successful;

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}

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// Do not run this check if it has been disabled.

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if ( ! isset( $_POST['string-locator-loopback-check'] ) ) {

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return $save_successful;

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}

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return $this->run();

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}

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public function print_checks_option() {

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<label>

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<?php esc_html_e( 'Enable loopback tests after making a save.', 'string-locator' ); ?>

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</label>

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<br>

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<em>

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<?php esc_html_e( 'This feature is highly recommended, and is what WordPress does when using the plugin- or theme-editor.', 'string-locator' ); ?>

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</em>

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</div>

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<?php

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}

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/**

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* A helper function to return any errors.

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* @return array

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public function get_errors() {

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return $this->errors;

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}

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/**

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* Main test runner.

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* @return bool

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public function run() {

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$this->bad_http_codes = apply_filters( 'string_locator_bad_http_codes', $this->bad_http_codes );

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// Clear the error log before doing a new request.

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$this->errors = array();

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$frontend = $this->test_frontend();

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// If the frontend has a loopback error, return it immediately.

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if ( ! $frontend ) {

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return false;

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}

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// If frontend tests are fine, we return the result of the backend scan.

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return $this->test_backend();

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}

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private function test_frontend() {

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$header = wp_remote_head( site_url() );

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// If we get redirected, follow the redirect.

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if ( ! is_wp_error( $header ) && 301 === (int) $header['response']['code'] ) {

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$header = wp_remote_head( $header['headers']['location'] );

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}

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if ( is_wp_error( $header ) ) {

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if ( 'http_request_failed' === $header->get_error_code() ) {

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$this->errors[] = array(

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'type' => 'error',

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'message' => __( 'Your changes were not saved, as a check of your site could not be completed afterwards. This may be due to a <a href="https://wordpress.org/support/article/loopbacks/">loopback</a> error.', 'string-locator' ),

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);

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return false;

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}

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// Fallback error message here.

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$this->errors[] = array(

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'type' => 'error',

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'message' => $header->get_error_message(),

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);

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return false;

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}

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if ( in_array( $header['response']['code'], $this->bad_http_codes, true ) ) {

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$this->errors[] = array(

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'type' => 'error',

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'message' => __( 'A 500 server error was detected on your site after updating your file. We have restored the previous version of the file for you.', 'string-locator' ),

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);

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return false;

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}

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return true;

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}

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private function test_backend() {

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$header = wp_remote_head( admin_url() );

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// If we get redirected, follow the redirect.

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if ( ! is_wp_error( $header ) && 301 === (int) $header['response']['code'] ) {

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$header = wp_remote_head( $header['headers']['location'] );

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}

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if ( is_wp_error( $header ) ) {

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if ( 'http_request_failed' === $header->get_error_code() ) {

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$this->errors[] = array(

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'type' => 'error',

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'message' => __( 'Your changes were not saved, as a check of your sites backend could not be completed afterwards. This may be due to a <a href="https://wordpress.org/support/article/loopbacks/">loopback</a> error.', 'string-locator' ),

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);

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return false;

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}

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// Fallback error message here.

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$this->errors[] = array(

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'type' => 'error',

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'message' => $header->get_error_message(),

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);

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return false;

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}

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if ( in_array( $header['response']['code'], $this->bad_http_codes, true ) ) {

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$this->errors[] = array(

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'type' => 'error',

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'message' => __( 'A 500 server error was detected on your sites backend after updating your file. We have restored the previous version of the file for you.', 'string-locator' ),

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);

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return false;

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}

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return true;

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}

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}

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new Loopback();

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