feat: support non-ICANN DNSLink names

https://github.com/ipfs/go-ipfs/issues/8060

dns.go

@@ -10,7 +10,7 @@ import (
 
 	path "github.com/ipfs/go-path"
 	opts "github.com/ipfs/interface-go-ipfs-core/options/namesys"
-	isd "github.com/jbenet/go-is-domain"
+	dns "github.com/miekg/dns"
 )
 
 // LookupTXTFunc is a generic type for a function that lookups TXT record values.
@@ -52,7 +52,7 @@ func (r *DNSResolver) resolveOnceAsync(ctx context.Context, name string, options
 	segments := strings.SplitN(name, "/", 2)
 	domain := segments[0]
 
-	if !isd.IsDomain(domain) {
+	if _, ok := dns.IsDomainName(domain); !ok {
 		out <- onceResult{err: fmt.Errorf("not a valid domain name: %s", domain)}
 		close(out)
 		return out

go.mod

@@ -13,7 +13,6 @@ require (
 	github.com/ipfs/go-log v1.0.4
 	github.com/ipfs/go-path v0.0.9
 	github.com/ipfs/interface-go-ipfs-core v0.4.0
-	github.com/jbenet/go-is-domain v1.0.5
 	github.com/jbenet/goprocess v0.1.4
 	github.com/libp2p/go-libp2p v0.13.0
 	github.com/libp2p/go-libp2p-core v0.8.0
@@ -21,6 +20,7 @@ require (
 	github.com/libp2p/go-libp2p-peerstore v0.2.6
 	github.com/libp2p/go-libp2p-record v0.1.3
 	github.com/libp2p/go-libp2p-testing v0.4.0
+	github.com/miekg/dns v1.1.41
 	github.com/multiformats/go-multiaddr v0.3.1
 	github.com/multiformats/go-multiaddr-dns v0.3.1
 	github.com/multiformats/go-multihash v0.0.14

go.sum

@@ -214,8 +214,6 @@ github.com/jackpal/go-nat-pmp v1.0.2/go.mod h1:QPH045xvCAeXUZOxsnwmrtiCoxIr9eob+
 github.com/jbenet/go-cienv v0.0.0-20150120210510-1bb1476777ec/go.mod h1:rGaEvXB4uRSZMmzKNLoXvTu1sfx+1kv/DojUlPrSZGs=
 github.com/jbenet/go-cienv v0.1.0 h1:Vc/s0QbQtoxX8MwwSLWWh+xNNZvM3Lw7NsTcHrvvhMc=
 github.com/jbenet/go-cienv v0.1.0/go.mod h1:TqNnHUmJgXau0nCzC7kXWeotg3J9W34CUv5Djy1+FlA=
-github.com/jbenet/go-is-domain v1.0.5 h1:r92uiHbMEJo9Fkey5pMBtZAzjPQWic0ieo7Jw1jEuQQ=
-github.com/jbenet/go-is-domain v1.0.5/go.mod h1:xbRLRb0S7FgzDBTJlguhDVwLYM/5yNtvktxj2Ttfy7Q=
 github.com/jbenet/go-temp-err-catcher v0.0.0-20150120210811-aac704a3f4f2/go.mod h1:8GXXJV31xl8whumTzdZsTt3RnUIiPqzkyf7mxToRCMs=
 github.com/jbenet/go-temp-err-catcher v0.1.0 h1:zpb3ZH6wIE8Shj2sKS+khgRvf7T7RABoLk/+KKHggpk=
 github.com/jbenet/go-temp-err-catcher v0.1.0/go.mod h1:0kJRvmDZXNMIiJirNPEYfhpPwbGVtZVWC34vc5WLsDk=

namesys.go

@@ -7,8 +7,8 @@
 // DHT).
 //
 // Additionally, the /ipns/ namespace can also be used with domain names that
-// use DNSLink (/ipns/my.domain.example, see https://dnslink.io) and proquint
-// strings.
+// use DNSLink (/ipns/<dnslink_name>, https://docs.ipfs.io/concepts/dnslink/)
+// and proquint strings.
 //
 // The package provides implementations for all three resolvers.
 package namesys
@@ -26,10 +26,10 @@ import (
 	dssync "github.com/ipfs/go-datastore/sync"
 	path "github.com/ipfs/go-path"
 	opts "github.com/ipfs/interface-go-ipfs-core/options/namesys"
-	isd "github.com/jbenet/go-is-domain"
 	ci "github.com/libp2p/go-libp2p-core/crypto"
 	peer "github.com/libp2p/go-libp2p-core/peer"
 	routing "github.com/libp2p/go-libp2p-core/routing"
+	dns "github.com/miekg/dns"
 	madns "github.com/multiformats/go-multiaddr-dns"
 )
 
@@ -225,9 +225,13 @@ func (ns *mpns) resolveOnceAsync(ctx context.Context, name string, options opts.
 
 	if err == nil {
 		res = ns.ipnsResolver
-	} else if isd.IsDomain(key) {
+	} else if _, ok := dns.IsDomainName(key); ok {
 		res = ns.dnsResolver
 	} else {
+		// TODO: remove proquint?
+		// dns.IsDomainName(key) will return true for proquint strings,
+		// so this block is a dead code.
+		// (alternative is to move this before DNS check)
 		res = ns.proquintResolver
 	}