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📝 Editing: class-forminator-addon-slack-wp-api.php

<?php
/**
 * Forminator Slack API
 *
 * @package Forminator
 */

/**
 * Class Forminator_Slack_Wp_Api
 */
class Forminator_Slack_Wp_Api {

const AUTHORIZE_URL = 'https://slack.com/oauth/authorize';

/**
	 * OAuth scopes
	 *
	 * @var array
	 */
	public static $oauth_scopes
		= array(
			'channels:read',
			'channels:write',
			'chat:write:bot',
			'groups:read',
			'groups:write',
			'users:read',
		);

/**
	 * Instances of slack api
	 *
	 * @var array
	 */
	private static $_instances = array();

/**
	 * Slack endpoint
	 *
	 * @var string
	 */
	private $_endpoint = 'https://slack.com/api';

/**
	 * Last data sent to slack
	 *
	 * @since 1.0 Slack Integration
	 * @var array
	 */
	private $_last_data_sent = array();

/**
	 * Last data received from slack
	 *
	 * @since 1.0 Slack Integration
	 * @var array
	 */
	private $_last_data_received = array();

/**
	 * Last URL requested
	 *
	 * @since 1.0 Slack Integration
	 * @var string
	 */
	private $_last_url_request = '';

/**
	 * Token
	 *
	 * @var array
	 */
	private $_token = '';

/**
	 * Forminator_Slack_Wp_Api constructor.
	 *
	 * @since 1.0 Slack Integration
	 *
	 * @param string $_token Token.
	 *
	 * @throws Forminator_Integration_Exception Throws Integration Exception.
	 */
	public function __construct( $_token ) {
		// prerequisites.
		if ( ! $_token ) {
			throw new Forminator_Integration_Exception( esc_html__( 'Missing required Token', 'forminator' ) );
		}

$this->_token = $_token;
	}

/**
	 * Get singleton
	 *
	 * @since 1.0 Slack Integration
	 *
	 * @param string $_token Token.
	 *
	 * @return Forminator_Slack_Wp_Api|null
	 */
	public static function get_instance( $_token ) {
		if ( ! isset( self::$_instances[ md5( $_token ) ] ) ) {
			self::$_instances[ md5( $_token ) ] = new self( $_token );
		}

return self::$_instances[ md5( $_token ) ];
	}

/**
	 * Add custom user agent on request
	 *
	 * @since 1.0 Slack Integration
	 *
	 * @param string $user_agent User agent.
	 *
	 * @return string
	 */
	public function filter_user_agent( $user_agent ) {
		$user_agent .= ' ForminatorSlack/' . FORMINATOR_ADDON_SLACK_VERSION;

/**
		 * Filter user agent to be used by slack api
		 *
		 * @since 1.1
		 *
		 * @param string $user_agent current user agent.
		 */
		$user_agent = apply_filters( 'forminator_addon_slack_api_user_agent', $user_agent );

return $user_agent;
	}

/**
	 * HTTP Request
	 *
	 * @since 1.0 Slack Integration
	 *
	 * @param string $verb HTTP Request type.
	 * @param string $path Path.
	 * @param array  $args Arguments.
	 *
	 * @return array|mixed|object
	 * @throws Forminator_Integration_Exception Throws Integration Exception.
	 */
	private function request( $verb, $path, $args = array() ) {
		// Adding extra user agent for wp remote request.
		add_filter( 'http_headers_useragent', array( $this, 'filter_user_agent' ) );

$url  = trailingslashit( $this->_endpoint ) . $path;
		$verb = ! empty( $verb ) ? $verb : 'GET';

/**
		 * Filter slack url to be used on sending api request
		 *
		 * @since 1.1
		 *
		 * @param string $url  full url with scheme.
		 * @param string $verb `GET` `POST` `PUT` `DELETE` `PATCH`.
		 * @param string $path requested path resource.
		 * @param array  $args argument sent to this function.
		 */
		$url = apply_filters( 'forminator_addon_slack_api_url', $url, $verb, $path, $args );

$this->_last_url_request = $url;

$headers = array(
			'Authorization' => 'Bearer ' . $this->_token,
		);

if ( 'GET' !== $verb ) {
			$headers['Content-Type'] = 'application/json; charset=utf-8';
		}

/**
		 * Filter slack headers to sent on api request
		 *
		 * @since 1.1
		 *
		 * @param array  $headers
		 * @param string $verb `GET` `POST` `PUT` `DELETE` `PATCH`.
		 * @param string $path requested path resource.
		 * @param array  $args argument sent to this function.
		 */
		$headers = apply_filters( 'forminator_addon_slack_api_request_headers', $headers, $verb, $path, $args );

$_args = array(
			'method'  => $verb,
			'headers' => $headers,
		);

$request_data = $args;
		/**
		 * Filter slack request data to be used on sending api request
		 *
		 * @since 1.1
		 *
		 * @param array  $request_data it will be `http_build_query`-ed when `GET` or `wp_json_encode`-ed otherwise.
		 * @param string $verb         `GET` `POST` `PUT` `DELETE` `PATCH`.
		 * @param string $path         requested path resource.
		 */
		$args = apply_filters( 'forminator_addon_slack_api_request_data', $request_data, $verb, $path );

if ( 'GET' === $verb ) {
			$url .= ( '?' . http_build_query( $args ) );
		} else {
			$_args['body'] = wp_json_encode( $args );
		}

$this->_last_data_sent = $args;

$res         = wp_remote_request( $url, $_args );
		$wp_response = $res;

remove_filter( 'http_headers_useragent', array( $this, 'filter_user_agent' ) );

if ( is_wp_error( $res ) || ! $res ) {
			throw new Forminator_Integration_Exception(
				esc_html__( 'Failed to process request, make sure your API URL is correct and your server has internet connection.', 'forminator' )
			);
		}

if ( isset( $res['response']['code'] ) ) {
			$status_code = $res['response']['code'];
			$msg         = '';
			if ( $status_code > 400 ) {
				if ( isset( $res['response']['message'] ) ) {
					$msg = $res['response']['message'];
				}

if ( 404 === $status_code ) {
					throw new Forminator_Integration_Exception(
						sprintf(
						/* translators: %s: Error message */
							esc_html__( 'Failed to process request : %s', 'forminator' ),
							esc_html( $msg )
						)
					);
				}
				throw new Forminator_Integration_Exception(
					sprintf(
					/* translators: %s: Error message */
						esc_html__( 'Failed to process request : %s', 'forminator' ),
						esc_html( $msg )
					)
				);
			}
		}

$body = wp_remote_retrieve_body( $res );

// probably silent mode.
		if ( ! empty( $body ) ) {
			$res = json_decode( $body );
			if ( isset( $res->ok ) && false === $res->ok ) {
				$msg = '';
				if ( isset( $res->error ) ) {
					$msg = $res->error;
				}
				throw new Forminator_Integration_Exception(
					sprintf(
					/* translators: %s: Error message */
						esc_html__( 'Failed to process request : %s', 'forminator' ),
						esc_html( $msg )
					)
				);
			}
		}

$response = $res;
		/**
		 * Filter slack api response returned to integration
		 *
		 * @since 1.1
		 *
		 * @param mixed          $response    original wp remote request response or decoded body if available.
		 * @param string         $body        original content of http response's body.
		 * @param array|WP_Error $wp_response original wp remote request response.
		 */
		$res = apply_filters( 'forminator_addon_slack_api_response', $response, $body, $wp_response );

$this->_last_data_received = $res;

return $res;
	}

/**
	 * Get access token
	 *
	 * @param string $code Request code.
	 * @param string $redirect_uri Redirect URI.
	 * @param array  $args Arguments.
	 *
	 * @return array|mixed|object
	 */
	public function get_access_token( $code, $redirect_uri, $args = array() ) {
		$default_args = array(
			'code'         => $code,
			'redirect_uri' => $redirect_uri,
		);