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<?php
/**
* A class that interacts with WP.com A/B tests.
*
* @package automattic/jetpack-abtest
*/
namespace Automattic\Jetpack;
use Automattic\Jetpack\Connection\Client;
/**
* This class provides an interface to the WP.com A/B tests.
*/
class Abtest {
/**
* A variable to hold the tests we fetched, and their variations for the current user.
*
* @access private
*
* @var array
*/
private $tests = array();
/**
* Retrieve the test variation for a provided A/B test.
*
* @access public
*
* @param string $test_name Name of the A/B test.
* @return mixed|null A/B test variation, or null on failure.
*/
public function get_variation( $test_name ) {
$variation = $this->fetch_variation( $test_name );
// If there was an error retrieving a variation, conceal the error for the consumer.
if ( is_wp_error( $variation ) ) {
return null;
}
return $variation;
}
/**
* Fetch and cache the test variation for a provided A/B test from WP.com.
*
* @access protected
*
* @param string $test_name Name of the A/B test.
* @return mixed|Automattic\Jetpack\Error A/B test variation, or Automattic\Jetpack\Error on failure.
*/
protected function fetch_variation( $test_name ) {
// Make sure test name exists.
if ( ! $test_name ) {
return new Error( 'test_name_not_provided', 'A/B test name has not been provided.' );
}
// Make sure test name is a valid one.
if ( ! preg_match( '/^[A-Za-z0-9_]+$/', $test_name ) ) {
return new Error( 'invalid_test_name', 'Invalid A/B test name.' );
}
// Return cached test variations.
if ( isset( $this->tests[ $test_name ] ) ) {
return $this->tests[ $test_name ];
}
// Make the request to the WP.com API.
$response = $this->request_variation( $test_name );
// Bail if there was an error or malformed response.
if ( is_wp_error( $response ) || ! is_array( $response ) || ! isset( $response['body'] ) ) {
return new Error( 'failed_to_fetch_data', 'Unable to fetch the requested data.' );
}
// Decode the results.
$results = json_decode( $response['body'], true );
// Bail if there were no results or there is no test variation returned.
if ( ! is_array( $results ) || empty( $results['variation'] ) ) {
return new Error( 'unexpected_data_format', 'Data was not returned in the expected format.' );
}
// Store the variation in our internal cache.
$this->tests[ $test_name ] = $results['variation'];
return $results['variation'];
}
/**
* Perform the request for a variation of a provided A/B test from WP.com.
*
* @access protected
*
* @param string $test_name Name of the A/B test.
* @return mixed|Automattic\Jetpack\Error A/B test variation, or Automattic\Jetpack\Error on failure.
*/
protected function request_variation( $test_name ) {
return Client::wpcom_json_api_request_as_blog( sprintf( '/abtest/%s', $test_name ), '2', array(), null, 'wpcom' );
}
}
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