ip-address-protected-map-key.tec-views-v2.php

<?php
/**
 * Facilitates dictating a separate (IP-address protected) Google Maps
 * API key for server-side geocoding requests.
 */
class Server_Side_Google_Maps_Key {
	/**
	 * @var string
	 */
	private $key = '';

	/**
	 * Sets up a Google Maps API key to be used for server-side initiated
	 * geocoding requests.
	 *
	 * @param string $key
	 */
	public function __construct( string $key ) {
		$this->key = $key;
		add_filter( 'pre_http_request', [ $this, 'pre_http_request' ], 10, 3 );
	}

	/**
	 * @param mixed  $response
	 * @param array  $args
	 * @param string $url
	 *
	 * @return array|WP_Error
	 */
	public function pre_http_request( $response, $args, $url ) {
		// If this is not a Google Maps geocoding request, or if it is but our replacement
		// key is already in place, then we need do nothing more.
		if (
			0 !== strpos( $url, 'https://maps.googleapis.com/maps/api/geocode' )
			|| false !== strpos( $url, $this->key )
		) {
			return $response;
		}

		// Replace the API key.
		$url = add_query_arg( 'key', $this->key, $url );

		// Perform a new request with our alternative API key and return the result.
		return wp_remote_get( $url, $args );
	}
}

// Specify our alternative API key here (to be used for server-side geocoding requests).
new Server_Side_Google_Maps_Key( 'IP_ADDRESS_PROTECTED_API_KEY' );