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Editing: api.php

<?php
/**
 * The API Class
 *
 * Provides an easy to use interface for communicating with the iThemes updater server.
 *
 * Written by Chris Jean for iThemes.com
 * Version 1.1.1
 *
 * Version History
 *   1.0.0 - 2013-04-11 - Chris Jean
 *       Release ready
 *   1.0.1 - 2013-09-19 - Chris Jean
 *       Updated requires to not use dirname().
 *       Updated ithemes-updater-object to ithemes-updater-settings.
 *   1.1.0 - 2013-10-02 - Chris Jean
 *       Added get_package_changelog().
 *   1.1.1 - 2014-11-13 - Chris Jean
 *       Improved caching.
 *       Updated code to meet WordPress coding standards.
 */
class Ithemes_Updater_API {

/**
	 * Get the response for the activate_package action.
	 *
	 * @param string $username A valid iThemes username.
	 * @param string $password A valid iThemes password.
	 * @param array  $packages The packages to activate.
	 *
	 * @return array|WP_Error
	 */
	public static function activate_package( $username, $password, $packages ) {
		return self::get_response( 'activate_package', compact( 'username', 'password', 'packages' ), false );
	}

/**
	 * Get the response for the deactivate_package action.
	 *
	 * @param string $username A valid iThemes username.
	 * @param string $password A valid iThemes password.
	 * @param array  $packages The packages to deactivate.
	 *
	 * @return array|WP_Error
	 */
	public static function deactivate_package( $username, $password, $packages ) {
		return self::get_response( 'deactivate_package', compact( 'username', 'password', 'packages' ), false );
	}

/**
	 * Get the response for the get_licensed_site_url action.
	 *
	 * @return array|WP_Error
	 */
	public static function get_licensed_site_url() {
		$packages = array();
		return self::get_response( 'get_licensed_site_url', compact( 'packages' ), false );
	}

/**
	 * Get the response for the set_licensed_site_url action.
	 *
	 * @param string $username A valid iThemes username.
	 * @param string $password A valid iThemes password.
	 * @param string $site_url The site URL to set.
	 *
	 * @return array|WP_Error
	 */
	public static function set_licensed_site_url( $username, $password, $site_url ) {
		$packages = array();
		return self::get_response( 'set_licensed_site_url', compact( 'username', 'password', 'site_url', 'packages' ), false );
	}

/**
	 * Get the response for the get_package_details action.
	 *
	 * @param bool $cache Optional. Whether to use cached data.
	 *
	 * @return array|WP_Error
	 */
	public static function get_package_details( $cache = true ) {
		$packages = array();

return self::get_response( 'get_package_details', compact( 'packages' ), $cache );
	}

/**
	 * Get the response for the get_package_changelog action.
	 *
	 * @param string $package     The package to get the changelog for.
	 * @param string $cur_version Optional. The current version of the package.
	 *
	 * @return array|WP_Error
	 */
	public static function get_package_changelog( $package, $cur_version = false ) {
		require_once $GLOBALS['ithemes_updater_path'] . '/server.php';
		$url = add_query_arg( 'package', rawurlencode( $package ), Ithemes_Updater_Server::get_api_url() . 'product/changelog' );

$response = wp_remote_get( $url );

if ( is_wp_error( $response ) ) {
			return $response;
		}

if ( ! isset( $response['body'] ) ) {
			return new WP_Error( 'ithemes-updater-changelog-bad-wp-remote-get-response', __( 'Unrecognized response from <code>wp_remote_get</code>.', 'it-l10n-backupbuddy' ) );
		}

if ( isset( $response['response']['code'] ) && ( 200 !== $response['response']['code'] ) ) {
			return new WP_Error( 'ithemes-updater-wp-remote-get-error-' . $response['response']['code'], $response['response']['message'] );
		}

$body = $response['body'];

if ( '{' === substr( $body, 0, 1 ) ) {
			$error = json_decode( $body, true );

if ( is_array( $error ) && isset( $error['error'] ) && is_array( $error['error'] ) && isset( $error['error']['type'] ) && isset( $error['error']['message'] ) ) {
				return new WP_Error( 'ithemes-updater-json-decode-error-' . $error['error']['type'], $error['error']['message'] );
			} else {
				return new WP_Error( 'ithemes-updater-changelog-bad-json-decode-result', __( 'Unrecognized response from SolidWP API server.', 'it-l10n-backupbuddy' ) );
			}
		}

$versions = array();
		$version  = false;
		$depth    = 0;

$lines = preg_split( '/[\n\r]+/', $body );

foreach ( $lines as $line ) {
			if ( preg_match( '/^\d/', $line ) ) {
				if ( ! empty( $version ) && ( $depth > 0 ) ) {
					while ( $depth-- > 0 ) {
						$versions[ $version ] .= "</ul>\n";
					}
				}

$depth = 0;

$parts   = preg_split( '/\s+-\s+/', $line );
				$version = $parts[0];

if ( version_compare( $version, $cur_version, '<=' ) ) {
					$version = '';
					continue;
				}

$versions[ $version ] = '';

continue;
			} elseif ( preg_match( '/^\S/', $line ) ) {
				$version = '';
				continue;
			} elseif ( empty( $version ) ) {
				continue;
			}

$line = str_replace( '    ', "\t", $line );
			$line = str_replace( "\t", '', $line, $count );
			$line = preg_replace( '/^\s+/', '', $line );

if ( empty( $line ) ) {
				continue;
			}

$details = '';

if ( $count > $depth ) {
				$details .= "<ul>\n";
				$depth++;
			} elseif ( $count < $depth ) {
				$details .= "</ul>\n";
				$depth--;
			}

$details .= "<li>$line</li>\n";

$versions[ $version ] .= $details;
		}

if ( ! empty( $version ) && ( $depth > 0 ) ) {
			while ( $depth-- > 0 ) {
				$versions[ $version ] .= "</ul>\n";
			}
		}

uksort( $versions, 'version_compare' );
		$versions = array_reverse( $versions );

$changelog = '';

foreach ( $versions as $version => $details ) {
			$changelog .= "<h4>$version</h4>\n$details\n";
		}

$changelog = preg_replace( '/\s+$/', '', $changelog );

return $changelog;
	}

/**
	 * Get the response for the Get PatchStack Quota action.
	 *
	 * @param string $site_key The site key to lookup.
	 * @param bool   $cache    Whether to retrieve a cached response.
	 *
	 * @return array|WP_Error
	 */
	public static function get_patchstack_quota( $site_key, $cache = false ) {
		return self::get_response( 'get_patchstack_quota', compact( 'site_key' ), $cache );
	}

/**
	 * Get the response for the Consume PatchStack Quota action.
	 *
	 * @param string $username A valid iThemes username.
	 * @param string $password A valid iThemes password.
	 *
	 * @return array|WP_Error
	 */
	public static function consume_patchstack_quota( $username, $password, $site_key ) {
		return self::get_response( 'consume_patchstack_quota', compact( 'username', 'password', 'site_key' ), false );
	}

/**
	 * Get the response for the Remove PatchStack Quota action.
	 *
	 * @param string $username A valid iThemes username.
	 * @param string $password A valid iThemes password.
	 *
	 * @return array|WP_Error
	 */
	public static function remove_patchstack_quota( $username, $password, $site_urls ) {
		return self::get_response( 'remove_patchstack_quota', compact( 'username', 'password', 'site_urls' ), false );
	}

/**
	 * Get the response from the iThemes API server.
	 *
	 * @param string $action The action to perform.
	 * @param array  $args   The arguments to send to the server.
	 * @param bool   $cache  Whether or not to get the cached response.
	 *
	 * @return array|WP_Error The response from the server or a WP_Error object on failure.
	 */
	public static function get_response( $action, $args, $cache ) {
		require_once $GLOBALS['ithemes_updater_path'] . '/server.php';
		require_once $GLOBALS['ithemes_updater_path'] . '/updates.php';

if ( isset( $args['packages'] ) ) {
			$args['packages'] = self::get_request_package_details( $args['packages'] );
		}

// Ensure args are set.
		$args = wp_parse_args(
			$args,
			array(
				'username' => '',
				'password' => '',
				'site_url' => '',
				'packages' => array(),
			)
		);

$response  = false;
		$cached    = true;
		$md5       = substr( md5( serialize( $args ) ), 0, 5 ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize
		$cache_var = "it-updater-$action-$md5";

if ( $cache ) {
			$transient = get_site_transient( $cache_var );

if ( isset( $GLOBALS[ $cache_var ] ) ) {
				$response = $GLOBALS[ $cache_var ];
			} elseif ( false !== $transient ) {
				$response = $transient;
			}
		}

if ( false === $response ) {
			switch ( $action ) {
				case 'activate_package':
					$response = Ithemes_Updater_Server::activate_package( $args['username'], $args['password'], $args['packages'] );
					break;
				case 'deactivate_package':
					$response = Ithemes_Updater_Server::deactivate_package( $args['username'], $args['password'], $args['packages'] );
					break;
				case 'get_licensed_site_url':
					$response = Ithemes_Updater_Server::get_licensed_site_url( $args['packages'] );
					break;
				case 'set_licensed_site_url':
					$response = Ithemes_Updater_Server::set_licensed_site_url( $args['username'], $args['password'], $args['site_url'], $args['packages'] );
					break;
				case 'get_package_details':
					$response = Ithemes_Updater_Server::get_package_details( $args['packages'] );
					break;
				case 'get_patchstack_quota':
					$response = Ithemes_Updater_Server::get_patchstack_quota( $args['site_key'] );
					break;
				case 'consume_patchstack_quota':
					$response = Ithemes_Updater_Server::consume_patchstack_quota( $args['username'], $args['password'], $args['site_key'] );
					self::clear_cache_for( 'get_patchstack_quota', $args['site_key'] );
					break;
				case 'remove_patchstack_quota':
					$response = Ithemes_Updater_Server::remove_patchstack_quota( $args['username'], $args['password'], $args['site_urls'] );
					require_once $GLOBALS['ithemes_updater_path'] . '/keys.php';
					$security_key = Ithemes_Updater_Keys::get( 'ithemes-security-pro' );

if ( $security_key ) {
						self::clear_cache_for( 'get_patchstack_quota', $security_key );
					}
					break;
				default:
					/* translators: %s: The function name. */
					$response = new WP_Error( 'ithemes-updater-unrecognized-action', sprintf( __( 'Unrecognized action passed to %s', 'it-l10n-backupbuddy' ), 'Ithemes_Updater_API::get_response()' ) );
					break;
			}

if ( is_wp_error( $response ) ) {
				return $response;
			}

$cache_length = 86400 * $GLOBALS['ithemes-updater-settings']->get_option( 'timeout-multiplier' );

set_site_transient( $cache_var, $response, $cache_length );

$cached = false;
		}

Ithemes_Updater_Updates::process_server_response( $response, $cached );

$GLOBALS[ $cache_var ] = $response;

return $response;
	}

/**
	 * Clears the cache for a particular request.
	 *
	 * @param string $action The API action to call.
	 * @param array $args    Any args to pass to the API.
	 *
	 * @return void
	 */
	private static function clear_cache_for( $action, $args ) {
		$md5       = substr( md5( serialize( $args ) ), 0, 5 ); // phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.serialize_serialize
		$cache_var = "it-updater-$action-$md5";

delete_site_transient( $cache_var );
	}

/**
	 * Get the details for the packages in the request.
	 *
	 * @param array $desired_packages The packages to get details for.
	 *
	 * @return array The details for the packages in the request.
	 */
	private static function get_request_package_details( $desired_packages = array() ) {
		require_once $GLOBALS['ithemes_updater_path'] . '/packages.php';
		require_once $GLOBALS['ithemes_updater_path'] . '/keys.php';

$all_packages = Ithemes_Updater_Packages::get_local_details();
		reset( $desired_packages );

if ( empty( $desired_packages ) ) {
			$desired_packages = $all_packages;
		} elseif ( is_numeric( key( $desired_packages ) ) ) {
			$new_desired_packages = array();

foreach ( $all_packages as $path => $details ) {
				foreach ( $desired_packages as $package ) {
					if ( $package !== $details['package'] ) {
						continue;
					}

$new_desired_packages[ $path ] = $details;

break;
				}
			}

$desired_packages = $new_desired_packages;
		}

$packages = array();
		$keys     = Ithemes_Updater_Keys::get();

$package_slugs = array();

foreach ( $desired_packages as $data ) {
			$package_slugs[] = $data['package'];
		}

$legacy_keys = Ithemes_Updater_Keys::get_legacy( $package_slugs );

$active_themes = array(
			'stylesheet' => get_stylesheet_directory(),
			'template'   => get_template_directory(),
		);
		$active_themes = array_unique( $active_themes );

foreach ( $active_themes as $index => $path ) {
			$active_themes[ $index ] = basename( $path );
		}

foreach ( $desired_packages as $path => $data ) {
			$key = ( isset( $keys[ $data['package'] ] ) ) ? $keys[ $data['package'] ] : '';

$package = array(
				'ver' => $data['installed'],
				'key' => $key,
			);

if ( ! empty( $legacy_keys[ $data['package'] ] ) ) {
				$package['old-key'] = $legacy_keys[ $data['package'] ];
			}

if ( 'plugins' === $data['type'] ) {
				$package['active'] = (int) is_plugin_active( $path );
			} else {
				$dir = dirname( $path );

$package['active'] = (int) in_array( $dir, $active_themes, true );

if ( $package['active'] && ( count( $active_themes ) > 1 ) ) {
					if ( $dir === $active_themes['stylesheet'] ) {
						$package['child-theme'] = 1;
					} else {
						$package['parent-theme'] = 1;
					}
				}
			}

$package_key = $data['package'];
			$counter     = 0;

while ( isset( $packages[ $package_key ] ) ) {
				$package_key = "{$data['package']} ||| " . ++$counter;
			}

$packages[ $package_key ] = $package;
		}

if ( ! empty( $legacy_keys ) ) {
			Ithemes_Updater_Keys::delete_legacy( array_keys( $legacy_keys ) );
		}

return $packages;
	}

/**
	 * Get the error message for the given error.
	 *
	 * @param WP_Error $error    The error to get the message for.
	 * @param string   $package  Optional. The package the error is for.
	 *
	 * @return string The error message.
	 */
	public static function get_error_explanation( $error, $package = '' ) {
		$code         = $error->get_error_code();
		$package_name = Ithemes_Updater_Functions::get_package_name( $package );
		$message      = '';

switch ( $code ) {
			case 'ITXAPI_Updater_Bad_Login':
				$message = __( 'Incorrect password. Please make sure that you are supplying your SolidWP membership username and password details.', 'it-l10n-backupbuddy' );
				break;
			case 'ITXAPI_Updater_Username_Unknown':
			case 'ITXAPI_Updater_Username_Invalid':
				$message = __( 'Invalid username. Please make sure that you are supplying your SolidWP membership username and password details.', 'it-l10n-backupbuddy' );
				break;
			case 'ITXAPI_Product_Package_Unknown':
				/* translators: 1: Product name, 2: Package name. */
				$message = sprintf( __( 'The licensing server reports that the %1$s (%2$s) product is unknown. Please contact support for assistance.', 'it-l10n-backupbuddy' ), $package_name, $package );
				break;
			case 'ITXAPI_Updater_Too_Many_Sites':
				/* translators: 1: Product name. */
				$message = sprintf( __( '%1$s could not be licensed since the membership account is out of available licenses for this product. You can unlicense the product on other sites or upgrade your membership to one with a higher number of licenses in order to increase the amount of available licenses.', 'it-l10n-backupbuddy' ), $package_name );
				break;
			case 'ITXAPI_License_Key_Generate_Failed':
				/* translators: 1: Product name. */
				$message = sprintf( __( '%1$s could not be licensed due to an internal error. Please try to license %2$s again at a later time. If this problem continues, please contact SolidWP support.', 'it-l10n-backupbuddy' ), $package_name );
				break;
		}

if ( empty( $message ) ) {
			if ( ! empty( $package ) ) {
				/* translators: 1: product name, 2: error code. */
				$message = sprintf( __( 'An unknown error relating to the %1$s product occurred. Please contact SolidWP support. Error details: %2$s', 'it-l10n-backupbuddy' ), $package_name, $error->get_error_message() . " ($code)" );
			} else {
				/* translators: 1: error code. */
				$message = sprintf( __( 'An unknown error occurred. Please contact SolidWP support. Error details: %s', 'it-l10n-backupbuddy' ), $error->get_error_message() . " ($code)" );
			}
		}

return $message;
	}
}