feat: support decoding /p2p addresses that are encoded as CIDs

go.mod

@@ -3,6 +3,7 @@ module github.com/multiformats/go-multiaddr
 go 1.13
 
 require (
+	github.com/ipfs/go-cid v0.0.7
 	github.com/multiformats/go-multihash v0.0.14
 	github.com/multiformats/go-varint v0.0.6
 )

go.sum

+github.com/ipfs/go-cid v0.0.7 h1:ysQJVJA3fNDF1qigJbsSQOdjhVLsOEoPdh0+R97k3jY=
+github.com/ipfs/go-cid v0.0.7/go.mod h1:6Ux9z5e+HpkQdckYoX1PG/6xqKspzlEIR5SDmgqgC/I=
 github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1 h1:lYpkrQH5ajf0OXOcUbGjvZxxijuBwbbmlSxLiuofa+g=
 github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1/go.mod h1:pD8RvIylQ358TN4wwqatJ8rNavkEINozVn9DtGI3dfQ=
 github.com/minio/sha256-simd v0.1.1-0.20190913151208-6de447530771 h1:MHkK1uRtFbVqvAgvWxafZe54+5uBxLluGylDiKgdhwo=
 github.com/minio/sha256-simd v0.1.1-0.20190913151208-6de447530771/go.mod h1:B5e1o+1/KgNmWrSQK08Y6Z1Vb5pwIktudl0J58iy0KM=
+github.com/mr-tron/base58 v1.1.0/go.mod h1:xcD2VGqlgYjBdcBLw+TuYLr8afG+Hj8g2eTVqeSzSU8=
 github.com/mr-tron/base58 v1.1.3 h1:v+sk57XuaCKGXpWtVBX8YJzO7hMGx4Aajh4TQbdEFdc=
 github.com/mr-tron/base58 v1.1.3/go.mod h1:BinMc/sQntlIE1frQmRFPUoPA1Zkr8VRgBdjWI2mNwc=
+github.com/multiformats/go-base32 v0.0.3 h1:tw5+NhuwaOjJCC5Pp82QuXbrmLzWg7uxlMFp8Nq/kkI=
+github.com/multiformats/go-base32 v0.0.3/go.mod h1:pLiuGC8y0QR3Ue4Zug5UzK9LjgbkL8NSQj0zQ5Nz/AA=
+github.com/multiformats/go-base36 v0.1.0 h1:JR6TyF7JjGd3m6FbLU2cOxhC0Li8z8dLNGQ89tUg4F4=
+github.com/multiformats/go-base36 v0.1.0/go.mod h1:kFGE83c6s80PklsHO9sRn2NCoffoRdUUOENyW/Vv6sM=
+github.com/multiformats/go-multibase v0.0.3 h1:l/B6bJDQjvQ5G52jw4QGSYeOTZoAwIO77RblWplfIqk=
+github.com/multiformats/go-multibase v0.0.3/go.mod h1:5+1R4eQrT3PkYZ24C3W2Ue2tPwIdYQD509ZjSb5y9Oc=
+github.com/multiformats/go-multihash v0.0.13/go.mod h1:VdAWLKTwram9oKAatUcLxBNUjdtcVwxObEQBtRfuyjc=
 github.com/multiformats/go-multihash v0.0.14 h1:QoBceQYQQtNUuf6s7wHxnE2c8bhbMqhfGzNI032se/I=
 github.com/multiformats/go-multihash v0.0.14/go.mod h1:VdAWLKTwram9oKAatUcLxBNUjdtcVwxObEQBtRfuyjc=
 github.com/multiformats/go-varint v0.0.5 h1:XVZwSo04Cs3j/jS0uAEPpT3JY6DzMcVLLoWOSnCxOjg=

multiaddr_test.go

@@ -7,6 +7,9 @@ import (
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/ipfs/go-cid"
+	mh "github.com/multiformats/go-multihash"
 )
 
 func newMultiaddr(t *testing.T, a string) Multiaddr {
@@ -126,14 +129,22 @@ func TestConstructSucceeds(t *testing.T) {
 		"/udp/65535",
 		"/tcp/65535",
 		"/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC",
+		"/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7",
 		"/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC",
+		"/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7",
+		"/p2p/bafzbeigvf25ytwc3akrijfecaotc74udrhcxzh2cx3we5qqnw5vgrei4bm",
+		"/p2p/12D3KooWCryG7Mon9orvQxcS1rYZjotPgpwoJNHHKcLLfE4Hf5mV",
+		"/p2p/k51qzi5uqu5dhb6l8spkdx7yxafegfkee5by8h7lmjh2ehc2sgg34z7c15vzqs",
+		"/p2p/bafzaajaiaejcalj543iwv2d7pkjt7ykvefrkfu7qjfi6sduakhso4lay6abn2d5u",
 		"/udp/1234/sctp/1234",
 		"/udp/1234/udt",
 		"/udp/1234/utp",
 		"/tcp/1234/http",
 		"/tcp/1234/https",
 		"/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234",
+		"/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234",
 		"/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234",
+		"/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234",
 		"/ip4/127.0.0.1/udp/1234",
 		"/ip4/127.0.0.1/udp/0",
 		"/ip4/127.0.0.1/tcp/1234",
@@ -141,13 +152,19 @@ func TestConstructSucceeds(t *testing.T) {
 		"/ip4/127.0.0.1/udp/1234/quic",
 		"/ip4/127.0.0.1/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC",
 		"/ip4/127.0.0.1/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234",
+		"/ip4/127.0.0.1/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7",
+		"/ip4/127.0.0.1/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234",
 		"/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC",
 		"/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234",
+		"/ip4/127.0.0.1/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7",
+		"/ip4/127.0.0.1/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234",
 		"/unix/a/b/c/d/e",
 		"/unix/stdio",
 		"/ip4/1.2.3.4/tcp/80/unix/a/b/c/d/e/f",
 		"/ip4/127.0.0.1/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234/unix/stdio",
+		"/ip4/127.0.0.1/ipfs/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234/unix/stdio",
 		"/ip4/127.0.0.1/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC/tcp/1234/unix/stdio",
+		"/ip4/127.0.0.1/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl7/tcp/1234/unix/stdio",
 		"/ip4/127.0.0.1/tcp/9090/http/p2p-webrtc-direct",
 		"/ip4/127.0.0.1/tcp/127/ws",
 		"/ip4/127.0.0.1/tcp/127/ws",
@@ -544,7 +561,7 @@ func TestIPFSvP2P(t *testing.T) {
 	}
 }
 
-func TestInvalidP2PAddr(t *testing.T) {
+func TestInvalidP2PAddrBytes(t *testing.T) {
 	badAddr := "a503221221c05877cbae039d70a5e600ea02c6f9f2942439285c9e344e26f8d280c850fad6"
 	bts, err := hex.DecodeString(badAddr)
 	if err != nil {
@@ -558,6 +575,31 @@ func TestInvalidP2PAddr(t *testing.T) {
 	}
 }
 
+func TestInvalidP2PAddrString(t *testing.T) {
+	hashedData, err := mh.Sum([]byte("test"), mh.SHA2_256, -1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// using MD5 since it's not a valid data codec
+	unknownCodecCID := cid.NewCidV1(mh.MD5, hashedData).String()
+
+	badStringAddrs := []string{
+		"/p2p/k2k4r8oqamigqdo6o7hsbfwd45y70oyynp98usk7zmyfrzpqxh1pohl-", // invalid multibase encoding
+		"/p2p/?unknownmultibase", // invalid multibase encoding
+		"/p2p/k2jmtxwoe2phm1hbqp0e7nufqf6umvuu2e9qd7ana7h411a0haqj6i2z", // non-libp2p-key codec
+		"/p2p/" + unknownCodecCID, // impossible codec
+	}
+	for _, a := range badStringAddrs {
+		ma, err := NewMultiaddr(a)
+		if err == nil {
+			t.Error("should have failed")
+			// Check for panic
+			_ = ma.String()
+		}
+	}
+}
+
 func TestZone(t *testing.T) {
 	ip6String := "/ip6zone/eth0/ip6/::1"
 	ip6Bytes := []byte{

transcoders.go

@@ -10,6 +10,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/ipfs/go-cid"
 	mh "github.com/multiformats/go-multihash"
 )
 
@@ -292,13 +293,29 @@ func garlic32Validate(b []byte) error {
 
 var TranscoderP2P = NewTranscoderFromFunctions(p2pStB, p2pBtS, p2pVal)
 
+// The encoded peer ID can either be a CID of a key or a raw multihash (identity
+// or sha256-256).
 func p2pStB(s string) ([]byte, error) {
-	// the address is a varint prefixed multihash string representation
-	m, err := mh.FromB58String(s)
+	// check if the address is a base58 encoded sha256 or identity multihash
+	if strings.HasPrefix(s, "Qm") || strings.HasPrefix(s, "1") {
+		m, err := mh.FromB58String(s)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse p2p addr: %s %s", s, err)
+		}
+		return m, nil
+	}
+
+	// check if the address is a CID
+	c, err := cid.Decode(s)
 	if err != nil {
 		return nil, fmt.Errorf("failed to parse p2p addr: %s %s", s, err)
 	}
-	return m, nil
+
+	if ty := c.Type(); ty == cid.Libp2pKey {
+		return c.Hash(), nil
+	} else {
+		return nil, fmt.Errorf("failed to parse p2p addr: %s has the invalid codec %d", s, ty)
+	}
 }
 
 func p2pVal(b []byte) error {