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Filename : Helper.php
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<?php

namespace SiteGround_Migrator\Helper;

/**
 * The helper class.
 *
 * Provide information on how to troubleshoot migration issue
 */
class Helper {

	/**
	 * Help articles.
	 *
	 * @var array
	 */
	private $articles = array(
		'https://www.siteground.com/kb/wordpress-migrator-allowed-memory-size-exhausted',
		'https://www.siteground.com/kb/wordpress-migrator-uncaught-pharexception-unable-open-new-phar',
		'https://www.siteground.com/kb/wordpress-migrator-long-tar-file-format',
		'https://www.siteground.com/kb/wordpress-migrator-curl-error-failed-connect-connection-refused',
		'https://www.siteground.com/kb/wordpress-migrator-curl-error-connection-timed-out',
		'https://www.siteground.com/kb/wordpress-migrator-can-not-download-manifest-file',
		'https://www.siteground.com/kb/wordpress-migrator-php-warning-getmypid-disabled',
		'https://www.siteground.com/kb/wordpress-migrator-can-not-connect-wp-migrator-plugin',
		'https://www.siteground.com/kb/wordpress-migrator-following-path-invalid-doesnt-exist',
		'https://www.siteground.com/kb/wordpress-migrator-memory-tried-allocate-bytes/',
		'https://www.siteground.com/kb/wordpress-migrator-maximum-execution-time-seconds-exceeded',
		'https://www.siteground.com/kb/wordpress-migrator-permissions-error/',
		'https://www.siteground.com/kb/wordpress-migrator-permissions-error/'
	);

	/**
	 * The error strings we wil ltry to match.
	 *
	 * @var array
	 */
	private $error_strings = array(
		'allowed memory size of',
		'unable to open new phar',
		'tar-based phar',
		'failed to connect to wp-transfer-api.sgvps.net',
		'connection timed out after',
		'can not download manifest file',
		'getmypid() has been disabled',
		'can not connect to siteground wp-migrator',
		'the following path is invalid or doesn\'t exist',
		'out of memory',
		'maximum execution time of',
		'failed to open dir',
		'returned a file that could not be opened',
	);

	/**
	 * Get the error message
	 *
	 * @since  1.0.26
	 *
	 * @param  array $error Array containing error information.
	 *
	 * @return string       Custom error message.
	 */
	public function get_error_message( $error ) {
		// Return the old message if the error message is empty.
		if ( empty( $error['message'] ) ) {
			return esc_html__( 'We’ve encountered a critical error in your current hosting environment that prevents our plugin to complete the transfer.', 'siteground-migrator' );
		}

		// Build the error message.
		$message = $error['message'];

		if ( ! empty( $error['file'] ) ) {
			$message .= ' in ' . $error['file'];
		}

		if ( ! empty( $error['line'] ) ) {
			$message .= ' on line ' . $error['line'];
		}

		$article = $this->get_article( $error['message'] );

		if ( false === $article ) {
			return $message;
		}

		if ( $article === 'https://www.siteground.com/kb/wordpress-migrator-permissions-error/' ) {
			$message = esc_html__( 'We’ve encountered a critical error in your current hosting environment that prevents our plugin to complete the transfer. Please check your current hosting permissions and error logs and initiate new transfer ', 'siteground-migrator' );
		}

		return $message . '<br><br> For more information on how to solve this problem, please read <a href="' . $article . '" target="_blank">this article</a>';
	}

	/**
	 * Get the help article by checking the error message.
	 *
	 * @since  1.0.26
	 *
	 * @param  array $error Array containing error information.
	 *
	 * @return int|bool     The article id or false otherwise.
	 */
	public function get_article( $error ) {
		foreach ( $this->error_strings as $index => $error_string ) {
			if ( false === stripos( $error, $error_string ) ) {
				continue;
			}

			return $this->articles[ $index ];
		}

		return false;
	}

	/**
	 * Prepare the messages before the transfer start.
	 *
	 * @since  1.0.27
	 *
	 * @param  string $response The API response message.
	 *
	 * @return string The message we want to show.
	 */
	public function before_transfer_messages( $response ) {
		// Set the error messages.
		$messages = array(
			// Default message if the response message is not in the list or the error is 500.
			'default' => __( 'Please check your current hosting permissions and error logs and initiate new transfer.', 'siteground-migrator' ),
			// Wrong transfer id or wrong token.
			'Unknown' => __( 'Please, make sure the transfer token is valid and has not expired.', 'siteground-migrator' ),
			// Incorrect Hosting permissions or the request cannot be made due to a block due to API block.
			'Can not' => __( 'An error occured while initiating the transfer. Please, check your current files and folders permissions and initiate a new transfer.', 'siteground-migrator' ),
			// Invalid authentication(invalid/expired token) or use of a blocked domain or src.
			'Invalid' => __( 'Please, verify the token used! If you still get this error after you initiate a new transfer, check if it’s not expired. You can try generating new token and start the transfer anew.', 'siteground-migrator' ),
		);

		// Return the proper response message if we have a match.
		if ( array_key_exists( substr( $response, 0, 7 ), $messages ) ) {
			return $messages[ substr( $response, 0, 7 ) ];
		}

		// Return the default message.
		return $messages['default'];
	}

	/**
	 * Checks if the plugin run on the new SiteGround interface.
	 *
	 * @since 2.0.0
	 *
	 * @return boolean True/False.
	 */
	public static function is_siteground() {
		return (int) ( file_exists( '/etc/yum.repos.d/baseos.repo' ) && file_exists( '/Z' ) );
	}

	/**
	 * Checks if the plugin run on Flyweel hosting.
	 *
	 * @since 2.0.6
	 *
	 * @return boolean True/False.
	 */
	public static function is_flyweel() {
		if (
			isset( $_SERVER['SERVER_SOFTWARE'] ) &&
			false !== stripos( $_SERVER['SERVER_SOFTWARE'], 'Flywheel' )
		) {
			return true;
		}

		return false;
	}

	/**
	 * Get the sitespeed of an url for a device.
	 *
	 * @since 2.0.0
	 *
	 * @param  string  $url      The URL used for the sitespeed.
	 * @param  string  $device   The device that is to be used for the sitespeed tests.
	 * @param  integer $counter  Counter of how many tries have been ran.
	 * @return array             SiteSpeed results, false on error.
	 */
	public static function get_sitespeed( $url, $device = 'desktop', $counter = 0 ) {
		// Hit the url, so it can be cached, when Google Api make the request.
		if ( 0 === $counter ) {
			wp_remote_get( $url );
		}

		if ( 2 === $counter ) {
			return false;
		}

		// Make the request.
		$response = wp_remote_get(
			'https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=' . $url . '&locale=' . get_locale() . '&strategy=' . $device,
			array(
				'timeout' => 15,
			)
		);

		// Make another request if the previous fail.
		if ( is_wp_error( $response ) || 200 !== wp_remote_retrieve_response_code( $response ) ) {

			$counter++;
			return self::get_sitespeed( $url, $device, $counter );
		}

		// Bail if response is missing.
		if ( empty( $response ) || empty( $response['body'] ) ) {
			return false;
		}

		// Decode the response.
		$response = json_decode( $response['body'], true );

		// Check if tree is compatible with the expected result.
		if ( empty( $response['lighthouseResult']['audits']['metrics']['details']['items'][0] ) ) {
			return false;
		}

		// Return the analysis.
		return $response['lighthouseResult']['audits']['metrics']['details']['items'][0]['speedIndex'];
	}
}