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Editing: class-wp-oembed-controller.php

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<?php
/**
 * WP_oEmbed_Controller class, used to provide an oEmbed endpoint.
 *
 * @package WordPress
 * @subpackage Embeds
 * @since 4.4.0
 */

/**
 * oEmbed API endpoint controller.
 *
 * Registers the REST API route and delivers the response data.
 * The output format (XML or JSON) is handled by the REST API.
 *
 * @since 4.4.0
 */
#[AllowDynamicProperties]
final class WP_oEmbed_Controller {
	/**
	 * Register the oEmbed REST API route.
	 *
	 * @since 4.4.0
	 */
	public function register_routes() {
		/**
		 * Filters the maxwidth oEmbed parameter.
		 *
		 * @since 4.4.0
		 *
		 * @param int $maxwidth Maximum allowed width. Default 600.
		 */
		$maxwidth = apply_filters( 'oembed_default_width', 600 );

register_rest_route(
			'oembed/1.0',
			'/embed',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_item' ),
					'permission_callback' => '__return_true',
					'args'                => array(
						'url'      => array(
							'description' => __( 'The URL of the resource for which to fetch oEmbed data.' ),
							'required'    => true,
							'type'        => 'string',
							'format'      => 'uri',
						),
						'format'   => array(
							'default'           => 'json',
							'sanitize_callback' => 'wp_oembed_ensure_format',
						),
						'maxwidth' => array(
							'default'           => $maxwidth,
							'sanitize_callback' => 'absint',
						),
					),
				),
			)
		);

register_rest_route(
			'oembed/1.0',
			'/proxy',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_proxy_item' ),
					'permission_callback' => array( $this, 'get_proxy_item_permissions_check' ),
					'args'                => array(
						'url'       => array(
							'description' => __( 'The URL of the resource for which to fetch oEmbed data.' ),
							'required'    => true,
							'type'        => 'string',
							'format'      => 'uri',
						),
						'format'    => array(
							'description' => __( 'The oEmbed format to use.' ),
							'type'        => 'string',
							'default'     => 'json',
							'enum'        => array(
								'json',
								'xml',
							),
						),
						'maxwidth'  => array(
							'description'       => __( 'The maximum width of the embed frame in pixels.' ),
							'type'              => 'integer',
							'default'           => $maxwidth,
							'sanitize_callback' => 'absint',
						),
						'maxheight' => array(
							'description'       => __( 'The maximum height of the embed frame in pixels.' ),
							'type'              => 'integer',
							'sanitize_callback' => 'absint',
						),
						'discover'  => array(
							'description' => __( 'Whether to perform an oEmbed discovery request for unsanctioned providers.' ),
							'type'        => 'boolean',
							'default'     => true,
						),
					),
				),
			)
		);
	}

/**
	 * Callback for the embed API endpoint.
	 *
	 * Returns the JSON object for the post.
	 *
	 * @since 4.4.0
	 *
	 * @param WP_REST_Request $request Full data about the request.
	 * @return array|WP_Error oEmbed response data or WP_Error on failure.
	 */
	public function get_item( $request ) {
		$post_id = url_to_postid( $request['url'] );

/**
		 * Filters the determined post ID.
		 *
		 * @since 4.4.0
		 *
		 * @param int    $post_id The post ID.
		 * @param string $url     The requested URL.
		 */
		$post_id = apply_filters( 'oembed_request_post_id', $post_id, $request['url'] );

$data = get_oembed_response_data( $post_id, $request['maxwidth'] );

if ( ! $data ) {
			return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) );
		}

return $data;
	}

/**
	 * Checks if current user can make a proxy oEmbed request.
	 *
	 * @since 4.8.0
	 *
	 * @return true|WP_Error True if the request has read access, WP_Error object otherwise.
	 */
	public function get_proxy_item_permissions_check() {
		if ( ! current_user_can( 'edit_posts' ) ) {
			return new WP_Error( 'rest_forbidden', __( 'Sorry, you are not allowed to make proxied oEmbed requests.' ), array( 'status' => rest_authorization_required_code() ) );
		}
		return true;
	}

/**
	 * Callback for the proxy API endpoint.
	 *
	 * Returns the JSON object for the proxied item.
	 *
	 * @since 4.8.0
	 *
	 * @see WP_oEmbed::get_html()
	 * @global WP_Embed   $wp_embed   WordPress Embed object.
	 * @global WP_Scripts $wp_scripts
	 *
	 * @param WP_REST_Request $request Full data about the request.
	 * @return object|WP_Error oEmbed response data or WP_Error on failure.
	 */
	public function get_proxy_item( $request ) {
		global $wp_embed, $wp_scripts;

$args = $request->get_params();

// Serve oEmbed data from cache if set.
		unset( $args['_wpnonce'] );
		$cache_key = 'oembed_' . md5( serialize( $args ) );
		$data      = get_transient( $cache_key );
		if ( ! empty( $data ) ) {
			return $data;
		}

$url = $request['url'];
		unset( $args['url'] );

// Copy maxwidth/maxheight to width/height since WP_oEmbed::fetch() uses these arg names.
		if ( isset( $args['maxwidth'] ) ) {
			$args['width'] = $args['maxwidth'];
		}
		if ( isset( $args['maxheight'] ) ) {
			$args['height'] = $args['maxheight'];
		}

// Short-circuit process for URLs belonging to the current site.
		$data = get_oembed_response_data_for_url( $url, $args );

if ( $data ) {
			return $data;
		}

$data = _wp_oembed_get_object()->get_data( $url, $args );

if ( false === $data ) {
			// Try using a classic embed, instead.
			/* @var WP_Embed $wp_embed */
			$html = $wp_embed->get_embed_handler_html( $args, $url );

if ( $html ) {
				// Check if any scripts were enqueued by the shortcode, and include them in the response.
				$enqueued_scripts = array();

foreach ( $wp_scripts->queue as $script ) {
					$enqueued_scripts[] = $wp_scripts->registered[ $script ]->src;
				}

return (object) array(
					'provider_name' => __( 'Embed Handler' ),
					'html'          => $html,
					'scripts'       => $enqueued_scripts,
				);
			}

return new WP_Error( 'oembed_invalid_url', get_status_header_desc( 404 ), array( 'status' => 404 ) );
		}

/** This filter is documented in wp-includes/class-wp-oembed.php */
		$data->html = apply_filters( 'oembed_result', _wp_oembed_get_object()->data2html( (object) $data, $url ), $url, $args );

/**
		 * Filters the oEmbed TTL value (time to live).
		 *
		 * Similar to the {@see 'oembed_ttl'} filter, but for the REST API
		 * oEmbed proxy endpoint.
		 *
		 * @since 4.8.0
		 *
		 * @param int    $time    Time to live (in seconds).
		 * @param string $url     The attempted embed URL.
		 * @param array  $args    An array of embed request arguments.
		 */
		$ttl = apply_filters( 'rest_oembed_ttl', DAY_IN_SECONDS, $url, $args );

set_transient( $cache_key, $data, $ttl );

return $data;
	}
}

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Editing: class-wp-oembed-controller.php

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