88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
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package network
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
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)
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const (
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// maxProtocolsAmount is maximal amount of protocols
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// in multiaddress after parsing with network.AddressFromString
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maxProtocolsAmount = 3
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// minProtocolsAmount is minimal amount of protocols
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// in multiaddress after parsing with network.AddressFromString:
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// host(ip) and port.
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minProtocolsAmount = 2
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// network protocols
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dns, ip4, ip6 = "dns4", "ip4", "ip6"
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// transport protocols
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tcp = "tcp"
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)
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var (
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errIncorrectProtocolAmount = errors.New("numbers of protocols in multiaddress incorrect")
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errUnsupportedNetworkProtocol = errors.New("unsupported network protocol in multiaddress")
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errUnsupportedTransportProtocol = errors.New("unsupported transport protocol in multiaddress")
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errUnsupportedPresentationProtocol = errors.New("unsupported presentation protocol in multiaddress")
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)
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// VerifyMultiAddress validates multiaddress of n.
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//
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// If n's address contains more than 3 protocols
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// or less than 2 protocols an error returns.
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//
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// If n's address's protocol order is incorrect
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// an error returns.
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//
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// Correct composition(and order from low to high level)
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// of protocols:
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//
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// 1. dns4/ip4/ip6
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// 2. tcp
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// 3. tls(optional, may be absent)
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//
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func VerifyMultiAddress(ni *netmap.NodeInfo) error {
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// check if it can be parsed to network.Address
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var netAddr Address
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err := netAddr.FromString(ni.Address())
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if err != nil {
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return fmt.Errorf("could not parse multiaddr from NodeInfo: %w", err)
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}
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// check amount of protocols and its order
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return checkProtocols(netAddr)
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}
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func checkProtocols(a Address) error {
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pp := a.ma.Protocols()
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parsedProtocolsAmount := len(pp)
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if parsedProtocolsAmount > maxProtocolsAmount || parsedProtocolsAmount < minProtocolsAmount {
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return errIncorrectProtocolAmount
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}
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switch pp[0].Name {
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case dns, ip4, ip6:
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default:
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return errUnsupportedNetworkProtocol
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}
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if pp[1].Name != tcp {
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return errUnsupportedTransportProtocol
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}
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if parsedProtocolsAmount != minProtocolsAmount {
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if pp[2].Name != tlsProtocolName {
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return errUnsupportedPresentationProtocol
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}
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}
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return nil
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}
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