Function getRemoteAddress

coderd/httpmw/realip.go:191–207

getRemoteAddress extracts the IP address from the given string. If the string contains commas, it assumes that the first part is the original address.

(address string)

// the string contains commas, it assumes that the first part is the
// original address.
func getRemoteAddress(address string) net.IP {
	// X-Forwarded-For may contain multiple addresses, in case the
	// proxies are chained; the first value is the client address
	i := strings.IndexByte(address, ',')
	if i == -1 {
		i = len(address)
	}

	// If the address contains a port, remove it
	firstAddress := address[:i]
	host, _, err := net.SplitHostPort(firstAddress)
	if err != nil {
		// This will error if there is no port, so try to parse the address
		return net.ParseIP(firstAddress)
	}
	return net.ParseIP(host)
}

// isContainedIn checks that the given address is contained in the given
// network.