bp_document_allowed_mimes( Array $existing_mimes = array() )

function bp_document_allowed_mimes( $existing_mimes = array() ) {

	if ( bp_is_active( 'media' ) ) {
		$existing_mimes = array();
		$all_extensions = bp_document_extensions_list();
		foreach ( $all_extensions as $extension ) {
			if ( isset( $extension['is_active'] ) && true === (bool) $extension['is_active'] ) {
				$extension_name                      = ltrim( $extension['extension'], '.' );
				$existing_mimes[ "$extension_name" ] = $extension['mime_type'];
			}
		}
	}

	return $existing_mimes;
}