Zendesk contact form and integration

// WordPress Hooks
add_shortcode( 'ccom_contact_form', function( $atts ) {

	return ccom_contact_form::print_form();

} );

add_action( 'rest_api_init', function() {

	ccom_contact_form::rest_api_init();

} );

// Plugin Class
class ccom_contact_form {

	// Settings
	private static $zendesk_url = 'https://MY-SUBDOMAIN.zendesk.com/api/v2/requests.json';
	private static $username = '[email protected]/token';
	private static $password = 'TOKEN-GOES-HERE';

	// Shortcode To Render Form
	static function print_form() {

		$current_user = get_current_user_id() ? wp_get_current_user() : false;
		ob_start();

		?>
		<form id="contact_form" method="POST" action="/wp-json/ccom_contact_form/v1/submit">

			<?php if( $current_user ) { ?>
			<input type="hidden" name="redirect" value="/my-account/">
			<input type="hidden" name="name" value="<?php echo get_user_meta( $current_user->ID, 'first_name', true ); ?>">
			<input type="hidden" name="email" value="<?php echo $current_user->user_email; ?>">

			<?php } else { ?>
			<input type="hidden" name="redirect" value="/">
			<p>
				<input type="text" name="name" required="required"
					placeholder="First Last" aria-label="Your name">
			</p>
			<p>
				<input type="email" name="email" required="required"
					placeholder="[email protected]" aria-label="Your email address">
			</p>
			<?php } ?>

			<p>
				<textarea cols="30" rows="5" name="message" required="required"
					placeholder="Enter your message here." aria-label="Your message"></textarea>
			</p>
			<p>
				<input class="button" type="submit" value="Send message">
			</p>
		</form>
		<?php

		$ccom_contact_form = isset( $_GET['ccom_contact_form'] )
			? $_GET['ccom_contact_form'] : '';

		switch( $ccom_contact_form ) {
			case 'success':
				$tid = isset( $_GET['ticket_id'] ) ? $_GET['ticket_id'] : '';
				echo '<p>Thank you for your message. Your ticket number is #' . $tid . '</p>';
				break;
			case 'error':
				$msg = isset( $_GET['message'] ) ? $_GET['message'] : '';
				echo '<p>We\'re sorry. There was an error with your submission (' . $msg . ').</p>';
				break;
		}

		return ob_get_clean();

	}

	// REST API Endpoint
	static function rest_api_init() {

		register_rest_route(
			'ccom_contact_form/v1',
			'/submit',
			[
				'callback' => [
					'ccom_contact_form',
					'submit'
				],
				'methods' => 'POST',
				'permission_callback' => '__return_true',
			]
		);

	}

	// Form Submissions
	static function submit( WP_REST_Request $request ) {

		// Get Submission
		$field_redirect = $request->get_param( 'redirect' );
		$field_name = $request->get_param( 'name' );
		$field_email = $request->get_param( 'email' );
		$field_message = $request->get_param( 'message' );

		// Missing Data Error
		if( ! $field_name ) {
			exit(
				wp_safe_redirect(
					$field_redirect . '?ccom_contact_form=error&message=Name+missing'
				)
			);
		}

		if( ! $field_email ) {
			exit(
				wp_safe_redirect(
					$field_redirect . '?ccom_contact_form=error&message=Email+missing'
				)
			);
		}

		if( ! $field_message ) {
			exit(
				wp_safe_redirect(
					$field_redirect . '?ccom_contact_form=error&message=Message+missing'
				)
			);
		}

		// Append Tracing To Message
		$ip_address = empty( $_SERVER['HTTP_CF_CONNECTING_IP'] )
			? $_SERVER['REMOTE_ADDR'] : $_SERVER['HTTP_CF_CONNECTING_IP'];
		$field_message .= sprintf(
			"\n\nIP Address: %s\n\nUser Agent: %s",
			$ip_address, $_SERVER['HTTP_USER_AGENT']
		);

		if( ! empty( $_SERVER['HTTP_CF_IPCOUNTRY'] ) ) {
			$field_message .= sprintf(
				"\n\nGeolocation: %s", $_SERVER['HTTP_CF_IPCOUNTRY']
			);
		}

		// Submit Zendesk Ticket
		$response = wp_remote_post(
			self::$zendesk_url,
			[
				'headers' => [
					'Content-Type' => 'application/json',
					'Authorization' => 'Basic ' . base64_encode(
						self::$username . ':' . self::$password
					),
				],
				'body' => json_encode(
					[
						'request' => [
							'subject' => 'Website Contact Form',
							'comment' => [
								'body' => $field_message,
							],
							'requester' => [
								'locale_id' => '1',
								'name' => $field_name,
								'email' => $field_email,
							],
							'priority' => 'normal',
						],
					]
				),
				'timeout' => 30,
			]
		);

		// Communication Error
		if( is_wp_error( $response ) ) {
			exit(
				wp_safe_redirect(
					$field_redirect . '?ccom_contact_form=error&message=Comm+failure'
				)
			);
		}

		// Get Response Body And ID
		$response = wp_remote_retrieve_body( $response );
		$response = json_decode( $response );
		$tid = isset( $response->request->id )
			? intval( $response->request->id ) : '';

		// Zendesk Error
		if( ! $tid ) {
			$response = isset( $response->description )
				? $response->description : print_r( $response, true );
			exit(
				wp_safe_redirect(
					$field_redirect . '?ccom_contact_form=error&message=Zendesk+rejected:+' . $response
				)
			);
		}

		// Zendesk Success
		exit(
			wp_safe_redirect(
				$field_redirect . '?ccom_contact_form=success&ticket_id=' . $tid
			)
		);

	}

}