WP_REST_Posts_Controller::can_access_password_content( WP_Post $post, WP_REST_Request $request )

	public function can_access_password_content( $post, $request ) {
		if ( empty( $post->post_password ) ) {
			// No filter required.
			return false;
		}

		/*
		 * Users always gets access to password protected content in the edit
		 * context if they have the `edit_post` meta capability.
		 */
		if (
			'edit' === $request['context'] &&
			current_user_can( 'edit_post', $post->ID )
		) {
			return true;
		}

		// No password, no auth.
		if ( empty( $request['password'] ) ) {
			return false;
		}

		// Double-check the request password.
		return hash_equals( $post->post_password, $request['password'] );
	}