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| 1 | <?php |
| 2 | /** |
| 3 | * Sets up the Zendesk Chat REST API endpoints. |
| 4 | * |
| 5 | * @package automattic/my-jetpack |
| 6 | */ |
| 7 | |
| 8 | namespace Automattic\Jetpack\My_Jetpack; |
| 9 | |
| 10 | use Automattic\Jetpack\Connection\Client; |
| 11 | use WP_Error; |
| 12 | use WP_REST_Response; |
| 13 | |
| 14 | /** |
| 15 | * Registers the REST routes for Zendesk Chat. |
| 16 | * |
| 17 | * @phan-constructor-used-for-side-effects |
| 18 | */ |
| 19 | class REST_Zendesk_Chat { |
| 20 | const TRANSIENT_EXPIRY = 1 * MINUTE_IN_SECONDS * 60 * 24 * 7; // 1 week (JWT is actually 2 weeks, but lets be on the safe side) |
| 21 | const ZENDESK_AUTH_TOKEN = 'zendesk_auth_token'; |
| 22 | /** |
| 23 | * Constructor. |
| 24 | */ |
| 25 | public function __construct() { |
| 26 | register_rest_route( |
| 27 | 'my-jetpack/v1', |
| 28 | 'chat/availability', |
| 29 | array( |
| 30 | 'methods' => \WP_REST_Server::READABLE, |
| 31 | 'callback' => __CLASS__ . '::get_chat_availability', |
| 32 | 'permission_callback' => __CLASS__ . '::chat_authentication_permissions_callback', |
| 33 | ) |
| 34 | ); |
| 35 | |
| 36 | register_rest_route( |
| 37 | 'my-jetpack/v1', |
| 38 | 'chat/authentication', |
| 39 | array( |
| 40 | 'methods' => \WP_REST_Server::READABLE, |
| 41 | 'callback' => __CLASS__ . '::get_chat_authentication', |
| 42 | 'args' => array( |
| 43 | 'type' => array( |
| 44 | 'required' => false, |
| 45 | 'type' => 'string', |
| 46 | ), |
| 47 | 'test_mode' => array( |
| 48 | 'required' => false, |
| 49 | 'type' => 'boolean', |
| 50 | ), |
| 51 | ), |
| 52 | 'permission_callback' => __CLASS__ . '::chat_authentication_permissions_callback', |
| 53 | ) |
| 54 | ); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Ensure user is logged in if making an authentication request |
| 59 | * |
| 60 | * @access public |
| 61 | * @static |
| 62 | * |
| 63 | * @return WP_Error|true |
| 64 | */ |
| 65 | public static function chat_authentication_permissions_callback() { |
| 66 | if ( ! get_current_user_id() ) { |
| 67 | return new WP_Error( 'unauthorized', 'You must be logged in to access this resource.', array( 'status' => 401 ) ); |
| 68 | } |
| 69 | |
| 70 | return true; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Gets the transient key holding the current user's chat authentication token. |
| 75 | * |
| 76 | * The token is minted for the calling user's WordPress.com identity, so it must never |
| 77 | * be cached under a key shared by every user of the site. |
| 78 | * |
| 79 | * @access private |
| 80 | * @static |
| 81 | * |
| 82 | * @return string |
| 83 | */ |
| 84 | private static function get_auth_token_transient_key() { |
| 85 | return self::ZENDESK_AUTH_TOKEN . '_' . get_current_user_id(); |
| 86 | } |
| 87 | |
| 88 | /** |
| 89 | * Gets the chat authentication token. |
| 90 | * |
| 91 | * @return WP_Error|WP_REST_Response { token: string } |
| 92 | */ |
| 93 | public static function get_chat_authentication() { |
| 94 | $transient_key = self::get_auth_token_transient_key(); |
| 95 | |
| 96 | $authentication = get_transient( $transient_key ); |
| 97 | if ( $authentication ) { |
| 98 | return rest_ensure_response( $authentication ); |
| 99 | } |
| 100 | |
| 101 | // Discard any token left behind under the previous site-wide key. |
| 102 | delete_transient( self::ZENDESK_AUTH_TOKEN ); |
| 103 | |
| 104 | $proxied = function_exists( 'wpcom_is_proxied_request' ) ? wpcom_is_proxied_request() : false; |
| 105 | $wpcom_endpoint = 'help/authenticate/chat'; |
| 106 | $wpcom_api_version = '2'; |
| 107 | |
| 108 | $body = array( |
| 109 | 'type' => 'zendesk', |
| 110 | 'test_mode' => $proxied ? true : false, |
| 111 | ); |
| 112 | |
| 113 | $response = Client::wpcom_json_api_request_as_user( $wpcom_endpoint, $wpcom_api_version, array( 'method' => 'POST' ), $body ); |
| 114 | $response_code = wp_remote_retrieve_response_code( $response ); |
| 115 | $body = json_decode( wp_remote_retrieve_body( $response ) ); |
| 116 | |
| 117 | if ( is_wp_error( $response ) || empty( $response['body'] ) ) { |
| 118 | return new WP_Error( 'chat_authentication_failed', 'Chat authentication failed', array( 'status' => $response_code ) ); |
| 119 | } |
| 120 | |
| 121 | set_transient( $transient_key, $body, self::TRANSIENT_EXPIRY ); |
| 122 | return rest_ensure_response( $body ); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Calls `wpcom/v2/presales/chat?group=jp_presales` endpoint. |
| 127 | * This endpoint returns whether or not the Jetpack presales chat group is available |
| 128 | * |
| 129 | * @return WP_Error|WP_REST_Response { is_available: bool } |
| 130 | */ |
| 131 | public static function get_chat_availability() { |
| 132 | $wpcom_endpoint = '/presales/chat?group=jp_presales'; |
| 133 | $wpcom_api_version = '2'; |
| 134 | $response = Client::wpcom_json_api_request_as_user( $wpcom_endpoint, $wpcom_api_version ); |
| 135 | $response_code = wp_remote_retrieve_response_code( $response ); |
| 136 | $body = json_decode( wp_remote_retrieve_body( $response ) ); |
| 137 | |
| 138 | if ( is_wp_error( $response ) || empty( $response['body'] ) ) { |
| 139 | return new WP_Error( 'chat_config_data_fetch_failed', 'Chat config data fetch failed', array( 'status' => $response_code ) ); |
| 140 | } |
| 141 | |
| 142 | return rest_ensure_response( $body ); |
| 143 | } |
| 144 | } |