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<?php
/**
* Tests to determine if the WordPress loopbacks are able to run unhindered.
*
* @package Health Check
*/
// Make sure the file is not directly accessible.
if ( ! defined( 'ABSPATH' ) ) {
die( 'We\'re sorry, but you can not directly access this file.' );
}
/**
* Class Health_Check_Loopback
*/
class Health_Check_Loopback {
/**
* Run a loopback test on our site.
*
* @uses wp_unslash()
* @uses base64_encode()
* @uses admin_url()
* @uses add_query_arg()
* @uses is_array()
* @uses implode()
* @uses wp_remote_get()
* @uses compact()
* @uses is_wp_error()
* @uses wp_remote_retrieve_response_code()
* @uses sprintf()
*
* @param null|string $disable_plugin_hash Optional. A hash to send with our request to disable any plugins.
* @param null|string|array $allowed_plugins Optional. A string or array of approved plugin slugs that can run even when we globally ignore plugins.
*
* @return object
*/
static function can_perform_loopback( $disable_plugin_hash = null, $allowed_plugins = null ) {
$cookies = wp_unslash( $_COOKIE );
$timeout = 10;
$headers = array(
'Cache-Control' => 'no-cache',
);
// Include Basic auth in loopback requests.
if ( isset( $_SERVER['PHP_AUTH_USER'] ) && isset( $_SERVER['PHP_AUTH_PW'] ) ) {
$headers['Authorization'] = 'Basic ' . base64_encode( wp_unslash( $_SERVER['PHP_AUTH_USER'] ) . ':' . wp_unslash( $_SERVER['PHP_AUTH_PW'] ) );
}
$url = admin_url();
if ( ! empty( $disable_plugin_hash ) ) {
$url = add_query_arg(
array(
'health-check-disable-plugin-hash' => $disable_plugin_hash,
),
$url
);
}
if ( ! empty( $allowed_plugins ) ) {
if ( ! is_array( $allowed_plugins ) ) {
$allowed_plugins = (array) $allowed_plugins;
}
$url = add_query_arg(
array(
'health-check-allowed-plugins' => implode( ',', $allowed_plugins ),
),
$url
);
}
$r = wp_remote_get( $url, compact( 'cookies', 'headers', 'timeout' ) );
if ( is_wp_error( $r ) ) {
return (object) array(
'status' => 'critical',
'message' => sprintf(
'%s<br>%s',
esc_html__( 'The loopback request to your site failed, this means features relying on them are not currently working as expected.', 'health-check' ),
sprintf(
/* translators: %1$d: The HTTP response code. %2$s: The error message returned. */
esc_html__( 'Error encountered: (%1$d) %2$s', 'health-check' ),
wp_remote_retrieve_response_code( $r ),
$r->get_error_message()
)
),
);
}
if ( 200 !== wp_remote_retrieve_response_code( $r ) ) {
return (object) array(
'status' => 'recommended',
'message' => sprintf(
/* translators: %d: The HTTP response code returned. */
esc_html__( 'The loopback request returned an unexpected http status code, %d, it was not possible to determine if this will prevent features from working as expected.', 'health-check' ),
wp_remote_retrieve_response_code( $r )
),
);
}
return (object) array(
'status' => 'good',
'message' => __( 'The loopback request to your site completed successfully.', 'health-check' ),
);
}
/**
* Perform the loopback check, but ensure no plugins are enabled when we do so.
*
* @uses ob_start()
* @uses Health_Check_Troubleshoot::mu_plugin_exists()
* @uses Health_Check::get_filesystem_credentials()
* @uses Health_Check_Troubleshoot::setup_must_use_plugin()
* @uses Health_Check_Troubleshoot::maybe_update_must_use_plugin()
* @uses ob_get_clean()
* @uses wp_send_json_error()
* @uses md5()
* @uses rand()
* @uses update_option()
* @uses Health_Check_Loopback::can_perform_loopback()
* @uses sprintf()
* @uses esc_attr()
* @uses esc_html__()
* @uses esc_html()
* @uses wp_send_json_success()
*
* @return void
*/
static function loopback_no_plugins() {
check_ajax_referer( 'health-check-loopback-no-plugins' );
if ( ! current_user_can( 'view_site_health_checks' ) ) {
wp_send_json_error();
}
ob_start();
$needs_creds = false;
if ( ! Health_Check_Troubleshoot::mu_plugin_exists() ) {
if ( ! Health_Check::get_filesystem_credentials() ) {
$needs_creds = true;
} else {
$check_output = Health_Check_Troubleshoot::setup_must_use_plugin();
if ( false === $check_output ) {
$needs_creds = true;
}
}
} else {
if ( ! Health_Check_Troubleshoot::maybe_update_must_use_plugin() ) {
$needs_creds = true;
}
}
$result = ob_get_clean();
if ( $needs_creds ) {
wp_send_json_error( $result );
die();
}
$loopback_hash = md5( rand() );
update_option( 'health-check-disable-plugin-hash', $loopback_hash );
update_option( 'health-check-default-theme', 'yes' );
$no_plugin_test = Health_Check_Loopback::can_perform_loopback( $loopback_hash );
$message = sprintf(
'<br><span class="%s"></span> %s: %s',
esc_attr( $no_plugin_test->status ),
esc_html__( 'Result from testing without any plugins active and a default theme', 'health-check' ),
$no_plugin_test->message
);
if ( 'error' !== $no_plugin_test->status ) {
$plugins = wp_get_active_and_valid_plugins();
$theme = wp_get_theme();
$message .= '<table id="loopback-individual-plugins-list">';
foreach ( $plugins as $single_plugin ) {
$plugin = get_plugin_data( $single_plugin );
$message .= sprintf(
'<tr data-test-plugin="%s" class="not-tested"><td>%s</td><td class="individual-loopback-test-status">%s</td></tr>',
esc_attr( plugin_basename( $single_plugin ) ),
esc_html( $plugin['Name'] ),
esc_html__( 'Waiting...', 'health-check' )
);
}
$message .= sprintf(
'<tr id="test-single-no-theme"><td>%s</td><td class="individual-loopback-test-status">%s</td></tr>',
sprintf(
// translators: %s: The active theme name.
esc_html__( 'Active theme: %s', 'health-check' ),
$theme->name
),
esc_html__( 'Waiting...', 'health-check' )
);
$message .= '</table>';
$message .= '<br><button type="button" id="loopback-individual-plugins" class="button button-primary">Test individual plugins</button>';
}
$response = array(
'message' => $message,
);
delete_option( 'health-check-default-theme' );
wp_send_json_success( $response );
die();
}
/**
* Test individual plugins for loopback compatibility issues.
*
* This function will perform the loopback check, without any plugins, then conditionally enables one plugin at a time.
*
* @uses ob_start()
* @uses Health_Check_Troubleshoot::mu_plugin_exists()
* @uses Health_Check::get_filesystem_credentials()
* @uses Health_Check_Troubleshoot::setup_must_use_plugin()
* @uses ob_get_clean()
* @uses wp_send_json_error()
* @uses delete_option()
* @uses get_option()
* @uses md5()
* @uses rand()
* @uses update_option()
* @uses explode()
* @uses Health_Check_Loopback::can_perform_loopback()
* @uses sprintf()
* @uses esc_attr()
* @uses esc_html__()
* @uses esc_html()
* @uses wp_send_json_success()
*
* @return void
*/
static function loopback_test_individual_plugins() {
check_ajax_referer( 'health-check-loopback-individual-plugins' );
if ( ! current_user_can( 'view_site_health_checks' ) ) {
wp_send_json_error();
}
ob_start();
$needs_creds = false;
if ( ! Health_Check_Troubleshoot::mu_plugin_exists() ) {
if ( ! Health_Check::get_filesystem_credentials() ) {
$needs_creds = true;
} else {
Health_Check_Troubleshoot::setup_must_use_plugin();
}
}
$result = ob_get_clean();
if ( $needs_creds ) {
wp_send_json_error( $result );
die();
}
delete_option( 'health-check-disable-plugin-hash' );
$loopback_hash = md5( rand() );
update_option( 'health-check-disable-plugin-hash', $loopback_hash );
$plugin_slug = explode( '/', $_POST['plugin'] );
$plugin_slug = $plugin_slug[0];
$single_test = Health_Check_Loopback::can_perform_loopback( $loopback_hash, $plugin_slug );
$message = sprintf(
'<span class="%s"></span> %s',
esc_attr( $single_test->status ),
$single_test->message
);
$response = array(
'message' => $message,
);
wp_send_json_success( $response );
die();
}
static function loopback_test_default_theme() {
check_ajax_referer( 'health-check-loopback-default-theme' );
if ( ! current_user_can( 'view_site_health_checks' ) ) {
wp_send_json_error();
}
ob_start();
$needs_creds = false;
if ( ! Health_Check_Troubleshoot::mu_plugin_exists() ) {
if ( ! Health_Check::get_filesystem_credentials() ) {
$needs_creds = true;
} else {
Health_Check_Troubleshoot::setup_must_use_plugin();
}
}
$result = ob_get_clean();
if ( $needs_creds ) {
wp_send_json_error( $result );
die();
}
delete_option( 'health-check-disable-plugin-hash' );
$loopback_hash = md5( rand() );
update_option( 'health-check-disable-plugin-hash', $loopback_hash );
$message = '';
// Test without a theme active.
update_option( 'health-check-default-theme', 'yes' );
$theme_test = Health_Check_Loopback::can_perform_loopback( $loopback_hash, '' );
$message .= sprintf(
'<span class="%s"></span> %s',
esc_attr( $theme_test->status ),
$theme_test->message
);
delete_option( 'health-check-default-theme' );
$response = array(
'message' => $message,
);
wp_send_json_success( $response );
die();
}
}