WP_REST_Attachments_Controller::create_item_permissions_check( WP_REST_Request $request ): true|WP_Error

Source

public function create_item_permissions_check( $request ) {
	$ret = parent::create_item_permissions_check( $request );

	if ( ! $ret || is_wp_error( $ret ) ) {
		return $ret;
	}

	if ( ! current_user_can( 'upload_files' ) ) {
		return new WP_Error(
			'rest_cannot_create',
			__( 'Sorry, you are not allowed to upload media on this site.' ),
			array( 'status' => 400 )
		);
	}

	// Attaching media to a post requires ability to edit said post.
	if ( ! empty( $request['post'] ) && ! current_user_can( 'edit_post', (int) $request['post'] ) ) {
		return new WP_Error(
			'rest_cannot_edit',
			__( 'Sorry, you are not allowed to upload media to this post.' ),
			array( 'status' => rest_authorization_required_code() )
		);
	}

	return true;
}

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