Added admin notice for the invalid/revoked token.

Author: iamdharmesh

includes/class-mailchimp-admin.php

@@ -29,6 +29,7 @@ class MailChimp_Admin {
 	 * Initialize the class
 	 */
 	public function init() {
+		add_action( 'admin_notices', array( $this, 'admin_notices' ) );
 		add_action( 'wp_ajax_mailchimp_sf_oauth_start', array( $this, 'start_oauth_process' ) );
 		add_action( 'wp_ajax_mailchimp_sf_oauth_finish', array( $this, 'finish_oauth_process' ) );
 	}
@@ -124,6 +125,7 @@ public function finish_oauth_process() {
 			if ( $result && ! empty( $result['access_token'] ) && ! empty( $result['data_center'] ) ) {
 				// Clean up the old data.
 				delete_option( 'mailchimp_sf_access_token' );
+				delete_option( 'mailchimp_sf_auth_error' );
 				delete_option( 'mc_datacenter' );
 
 				delete_site_transient( 'mailchimp_sf_oauth_secret' );
@@ -181,4 +183,31 @@ public function verify_and_save_oauth_token( $access_token, $data_center ) {
 			return new WP_Error( 'mailchimp-sf-invalid-role', $msg );
 		}
 	}
+
+	/**
+	 * Display admin notices.
+	 *
+	 * @since x.x.x
+	 */
+	public function admin_notices() {
+		// display a notice if the access token is invalid/revoked.
+		if ( get_option( 'mailchimp_sf_auth_error', false ) && current_user_can( 'manage_options' ) && get_option( 'mailchimp_sf_access_token', '' ) ) {
+			?>
+			<div class="notice notice-warning is-dismissible">
+				<p>
+					<?php
+					$message = sprintf(
+						/* translators: Placeholders: %1$s - <a> tag, %2$s - </a> tag */
+						__( 'Heads up! There may be a problem with your connection to Mailchimp. Please %1$sre-connect%2$s your Mailchimp account to fix the issue.', 'mailchimp' ),
+						'<a href="' . esc_url( admin_url( 'admin.php?page=mailchimp_sf_options' ) ) . '">',
+						'</a>'
+					);
+
+					echo wp_kses( $message, array( 'a' => array( 'href' => array() ) ) );
+					?>
+				</p>
+			</div>
+			<?php
+		}
+	}
 }

lib/mailchimp/mailchimp.php

@@ -124,6 +124,11 @@ public function get( $endpoint, $count = 10, $fields = array() ) {
 		if ( is_array( $request ) && 200 === $request['response']['code'] ) {
 			return json_decode( $request['body'], true );
 		} elseif ( is_array( $request ) && $request['response']['code'] ) {
+			// Check if Access Token is invalid/revoked.
+			if ( in_array( $request['response']['code'], array( 401, 403 ), true ) ) {
+				update_option( 'mailchimp_sf_auth_error', true );
+			}
+
 			$error = json_decode( $request['body'], true );
 			$error = new WP_Error( 'mailchimp-get-error', $error['detail'] );
 			return $error;
@@ -169,6 +174,11 @@ public function post( $endpoint, $body, $method = 'POST' ) {
 				return new WP_Error( 'mc-subscribe-error', $request->get_error_message() );
 			}
 
+			// Check if Access Token is invalid/revoked.
+			if ( is_array( $request ) && in_array( $request['response']['code'], array( 401, 403 ), true ) ) {
+				update_option( 'mailchimp_sf_auth_error', true );
+			}
+
 			$body       = json_decode( $request['body'], true );
 			$merges     = get_option( 'mc_merge_vars' );
 			$field_name = '';

mailchimp.php

@@ -252,7 +252,7 @@ function mailchimp_sf_request_handler() {
 				}
 
 				// erase auth information
-				$options = array( 'mc_api_key', 'mailchimp_sf_access_token', 'mc_datacenter', 'mc_sopresto_user', 'mc_sopresto_public_key', 'mc_sopresto_secret_key' );
+				$options = array( 'mc_api_key', 'mailchimp_sf_access_token', 'mc_datacenter', 'mailchimp_sf_auth_error', 'mc_sopresto_user', 'mc_sopresto_public_key', 'mc_sopresto_secret_key' );
 				mailchimp_sf_delete_options( $options );
 				break;
 			case 'change_form_settings':