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<?php
/**
* File: CdnEngine_Mirror_CloudFront.php
*
* @package W3TC
*/
namespace W3TC;
if ( ! defined( 'W3TC_SKIPLIB_AWS' ) ) {
require_once W3TC_DIR . '/vendor/autoload.php';
}
/**
* Class CdnEngine_Mirror_CloudFront
*
* Amazon CloudFront (mirror) CDN engine
*
* phpcs:disable PSR2.Methods.MethodDeclaration.Underscore
* phpcs:disable Generic.CodeAnalysis.UselessOverridingMethod.Found
*/
class CdnEngine_Mirror_CloudFront extends CdnEngine_Mirror {
/**
* CloudFront Client object
*
* @var CloudFrontClient
*/
private $api;
/**
* Constructor for the CDN Engine CloudFront class.
*
* @param array $config Configuration array for CloudFront client.
*
* @return void
*/
public function __construct( $config = array() ) {
parent::__construct( $config );
}
/**
* Initializes the CloudFront client API.
*
* @return bool Returns true if the CloudFront client is successfully initialized.
*
* @throws \Exception If the initialization fails.
*/
public function _init() {
if ( ! is_null( $this->api ) ) {
return;
}
if ( empty( $this->_config['key'] ) && empty( $this->_config['secret'] ) ) {
$credentials = \Aws\Credentials\CredentialProvider::defaultProvider();
} else {
$credentials = new \Aws\Credentials\Credentials(
$this->_config['key'],
$this->_config['secret']
);
}
$this->api = new \Aws\CloudFront\CloudFrontClient(
array(
'credentials' => $credentials,
'region' => 'us-east-1',
'version' => '2018-11-05',
)
);
return true;
}
/**
* Retrieves the origin for the CDN.
*
* @return string The host and port of the origin.
*/
public function _get_origin() {
return Util_Environment::host_port();
}
/**
* Purges the specified files from the CDN.
*
* @param array $files Array of files to purge from the CDN.
* @param array $results Reference to an array where the purge results will be stored.
*
* @return bool Returns true if the purge is successful, otherwise false.
*
* @throws \Exception If the purge fails.
*/
public function purge( $files, &$results ) {
try {
$this->_init();
$dist = $this->_get_distribution();
} catch ( \Exception $ex ) {
$results = $this->_get_results( $files, W3TC_CDN_RESULT_HALT, $ex->getMessage() );
return false;
}
$paths = array();
foreach ( $files as $file ) {
$remote_file = $file['remote_path'];
$paths[] = '/' . $remote_file;
}
try {
$invalidation = $this->api->createInvalidation(
array(
'DistributionId' => $dist['Id'],
'InvalidationBatch' => array(
'CallerReference' => 'w3tc-' . microtime(),
'Paths' => array(
'Items' => $paths,
'Quantity' => count( $paths ),
),
),
)
);
} catch ( \Exception $ex ) {
$results = $this->_get_results(
$files,
W3TC_CDN_RESULT_HALT,
sprintf( 'Unable to create invalidation batch (%s).', $ex->getMessage() )
);
return false;
}
$results = $this->_get_results( $files, W3TC_CDN_RESULT_OK, 'OK' );
return true;
}
/**
* Purges all files from the CDN.
*
* @param array $results Reference to an array where the purge results will be stored.
*
* @return bool Returns true if the purge is successful, otherwise false.
*/
public function purge_all( &$results ) {
return $this->purge( array( array( 'remote_path' => '*' ) ), $results );
}
/**
* Retrieves the domains associated with the CDN.
*
* @return array Array of domain names associated with the CDN.
*/
public function get_domains() {
if ( ! empty( $this->_config['cname'] ) ) {
return (array) $this->_config['cname'];
} elseif ( ! empty( $this->_config['id'] ) ) {
$domain = sprintf( '%s.cloudfront.net', $this->_config['id'] );
return array(
$domain,
);
}
return array();
}
/**
* Tests the CloudFront distribution connection and configuration.
*
* @param string $error Reference to a variable where error messages will be stored.
*
* @return bool Returns true if the test passes, otherwise false.
*/
public function test( &$error ) {
$this->_init();
/**
* Search active CF distribution
*/
$dists = $this->api->listDistributions();
if ( ! isset( $dists['DistributionList']['Items'] ) ) {
$error = 'Unable to list distributions.';
return false;
}
if ( ! count( $dists['DistributionList']['Items'] ) ) {
$error = 'No distributions found.';
return false;
}
$dist = $this->_get_distribution( $dists );
if ( 'Deployed' !== $dist['Status'] ) {
$error = sprintf( 'Distribution status is not Deployed, but "%s".', $dist['Status'] );
return false;
}
if ( ! $dist['Enabled'] ) {
$error = sprintf( 'Distribution for origin "%s" is disabled.', $origin );
return false;
}
if ( ! empty( $this->_config['cname'] ) ) {
$domains = (array) $this->_config['cname'];
$cnames = ( isset( $dist['Aliases']['Items'] ) ? (array) $dist['Aliases']['Items'] : array() );
foreach ( $domains as $domain ) {
$_domains = array_map( 'trim', explode( ',', $domain ) );
foreach ( $_domains as $_domain ) {
if ( ! in_array( $_domain, $cnames, true ) ) {
$error = sprintf( 'Domain name %s is not in distribution <acronym title="Canonical Name">CNAME</acronym> list.', $_domain );
return false;
}
}
}
} elseif ( ! empty( $this->_config['id'] ) ) {
$domain = $this->get_domain();
if ( $domain !== $dist['DomainName'] ) {
$error = sprintf( 'Distribution domain name mismatch (%s != %s).', $domain, $dist['DomainName'] );
return false;
}
}
return true;
}
/**
* Creates a new CloudFront distribution container.
*
* phpcs:disable WordPress.Arrays.MultipleStatementAlignment.DoubleArrowNotAligned
*
* @return string The ID of the newly created distribution container.
*
* @throws \Exception If the distribution creation fails.
*/
public function create_container() {
$this->_init();
// plugin cant set CNAMEs list since it CloudFront requires certificate to be specified associated with it.
$cnames = array();
// make distibution.
$origin_domain = $this->_get_origin();
try {
$result = $this->api->createDistribution(
array(
'DistributionConfig' => array(
'CallerReference' => $origin_domain,
'Comment' => 'Created by W3-Total-Cache',
'DefaultCacheBehavior' => array(
'AllowedMethods' => array(
'CachedMethods' => array(
'Items' => array(
'HEAD',
'GET',
),
'Quantity' => 2,
),
'Items' => array(
'HEAD',
'GET',
),
'Quantity' => 2,
),
'Compress' => true,
'DefaultTTL' => 86400,
'FieldLevelEncryptionId' => '',
'ForwardedValues' => array(
'Cookies' => array(
'Forward' => 'none',
),
'Headers' => array(
'Quantity' => 0,
),
'QueryString' => false,
'QueryStringCacheKeys' => array(
'Quantity' => 0,
),
),
'LambdaFunctionAssociations' => array(
'Quantity' => 0,
),
'MinTTL' => 0,
'SmoothStreaming' => false,
'TargetOriginId' => $origin_domain,
'TrustedSigners' => array(
'Enabled' => false,
'Quantity' => 0,
),
'ViewerProtocolPolicy' => 'allow-all',
),
'Enabled' => true,
'Origins' => array(
'Items' => array(
array(
'DomainName' => $origin_domain,
'Id' => $origin_domain,
'OriginPath' => '',
'CustomHeaders' => array(
'Quantity' => 0,
),
'CustomOriginConfig' => array(
'HTTPPort' => 80,
'HTTPSPort' => 443,
'OriginProtocolPolicy' => 'match-viewer',
),
),
),
'Quantity' => 1,
),
'Aliases' => array(
'Items' => $cnames,
'Quantity' => count( $cnames ),
),
),
)
);
// extract domain dynamic part stored later in a config.
$domain = $result['Distribution']['DomainName'];
$container_id = '';
if ( preg_match( '~^(.+)\.cloudfront\.net$~', $domain, $matches ) ) {
$container_id = $matches[1];
}
return $container_id;
} catch ( \Aws\Exception\AwsException $ex ) {
throw new \Exception(
\esc_html(
sprintf(
// Translators: 1 Origin domain name, 2 AWS error message.
\__( 'Unable to create distribution for origin %1$s: %2$s', 'w3-total-cache' ),
$origin_domain,
$ex->getAwsErrorMessage()
)
)
);
} catch ( \Exception $ex ) {
throw new \Exception(
\esc_html(
sprintf(
// Translators: 1 Origin domain name, 2 Error message.
\__( 'Unable to create distribution for origin %1$s: %2$s', 'w3-total-cache' ),
$origin_domain,
$ex->getMessage()
)
)
);
}
}
/**
* Retrieves the CDN's "via" information.
*
* @return string The "via" string indicating the CDN's origin.
*/
public function get_via() {
$domain = $this->get_domain();
$via = ( $domain ? $domain : 'N/A' );
return sprintf( 'Amazon Web Services: CloudFront: %s', $via );
}
/**
* Retrieves the CloudFront distribution for the origin.
*
* @param array|null $dists Optional array of distributions to search through. If null, all distributions are fetched.
*
* @return array The distribution information for the origin.
*
* @throws \Exception If no matching distribution is found.
*/
private function _get_distribution( $dists = null ) {
if ( is_null( $dists ) ) {
$dists = $this->api->listDistributions();
}
if ( ! isset( $dists['DistributionList']['Items'] ) || ! count( $dists['DistributionList']['Items'] ) ) {
throw new \Exception( \esc_html__( 'No distributions found.', 'w3-total-cache' ) );
}
$dist = false;
$origin = $this->_get_origin();
$items = $dists['DistributionList']['Items'];
foreach ( $items as $dist ) {
if ( isset( $dist['Origins']['Items'] ) ) {
foreach ( $dist['Origins']['Items'] as $o ) {
if ( isset( $o['DomainName'] ) && $o['DomainName'] === $origin ) {
return $dist;
}
}
}
}
throw new \Exception(
\esc_html(
sprintf(
// Translators: 1 Origin name.
\__( 'Distribution for origin "%1$s" not found.', 'w3-total-cache' ),
$origin
)
)
);
}
}