Add onion3 multiaddr support (#764)

libp2p/multiaddress.nim

@@ -222,6 +222,40 @@ proc onionVB(vb: var VBuffer): bool =
   if vb.readArray(buf) == 12:
     result = true
 
+proc onion3StB(s: string, vb: var VBuffer): bool =
+  try:
+    var parts = s.split(':')
+    if len(parts) != 2:
+      return false
+    if len(parts[0]) != 56:
+      return false
+    var address = Base32Lower.decode(parts[0].toLowerAscii())
+    var nport = parseInt(parts[1])
+    if (nport > 0 and nport < 65536) and len(address) == 35:
+      address.setLen(37)
+      address[35] = cast[byte]((nport shr 8) and 0xFF)
+      address[36] = cast[byte](nport and 0xFF)
+      vb.writeArray(address)
+      result = true
+  except:
+    discard
+
+proc onion3BtS(vb: var VBuffer, s: var string): bool =
+  ## ONION address bufferToString() implementation.
+  var buf: array[37, byte]
+  if vb.readArray(buf) == 37:
+    var nport = (cast[uint16](buf[35]) shl 8) or cast[uint16](buf[36])
+    s = Base32Lower.encode(buf.toOpenArray(0, 34))
+    s.add(":")
+    s.add($nport)
+    result = true
+
+proc onion3VB(vb: var VBuffer): bool =
+  ## ONION address validateBuffer() implementation.
+  var buf: array[37, byte]
+  if vb.readArray(buf) == 37:
+    result = true
+
 proc unixStB(s: string, vb: var VBuffer): bool =
   ## Unix socket name stringToBuffer() implementation.
   if len(s) > 0:
@@ -310,6 +344,11 @@ const
     bufferToString: onionBtS,
     validateBuffer: onionVB
   )
+  TranscoderOnion3* = Transcoder(
+    stringToBuffer: onion3StB,
+    bufferToString: onion3BtS,
+    validateBuffer: onion3VB
+  )
   TranscoderDNS* = Transcoder(
     stringToBuffer: dnsStB,
     bufferToString: dnsBtS,
@@ -363,6 +402,10 @@ const
       mcodec: multiCodec("onion"), kind: Fixed, size: 10,
       coder: TranscoderOnion
     ),
+    MAProtocol(
+      mcodec: multiCodec("onion3"), kind: Fixed, size: 37,
+      coder: TranscoderOnion3
+    ),
     MAProtocol(
       mcodec: multiCodec("ws"), kind: Marker, size: 0
     ),

libp2p/multicodec.nim

@@ -203,6 +203,7 @@ const MultiCodecList = [
   ("p2p-webrtc-star", 0x0113), # not in multicodec list
   ("p2p-webrtc-direct", 0x0114), # not in multicodec list
   ("onion", 0x01BC),
+  ("onion3", 0x01BD),
   ("p2p-circuit", 0x0122),
   ("libp2p-peer-record", 0x0301),
   ("dns", 0x35),

tests/testmultiaddress.nim

@@ -22,6 +22,8 @@ const
     "/ip6zone/x/ip6/fe80::1/udp/1234/quic",
     "/onion/timaq4ygg2iegci7:1234",
     "/onion/timaq4ygg2iegci7:80/http",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:1234",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:80/http",
     "/udp/0",
     "/tcp/0",
     "/sctp/0",
@@ -79,6 +81,12 @@ const
     "/onion/timaq4ygg2iegci7:-1",
     "/onion/timaq4ygg2iegci7",
     "/onion/timaq4ygg2iegci@:666",
+    "/onion3/9ww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:80",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd7:80",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:0",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:-1",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyy@:666",
     "/udp/1234/sctp",
     "/udp/1234/udt/1234",
     "/udp/1234/utp/1234",
@@ -170,6 +178,12 @@ const
     "/onion/timaq4ygg2iegci7:-1",
     "/onion/timaq4ygg2iegci7",
     "/onion/timaq4ygg2iegci@:666",
+    "/onion3/9ww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:80",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd7:80",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:0",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd:-1",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyyd",
+    "/onion3/vww6ybal4bd7szmgncyruucpgfkqahzddi37ktceo3ah7ngmcopnpyy@:666",
     "/udp/1234/sctp",
     "/udp/1234/udt/1234",
     "/udp/1234/utp/1234",
@@ -376,3 +390,15 @@ suite "MultiAddress test suite":
       $ma[1..2].get() == "/tcp/0/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC"
       $ma[^3..^1].get() == "/p2p-circuit/p2p/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSuNEXT/unix/stdio"
       ma[5..7].isErr()
+
+  test "[](MultiCodec) test":
+    let onionMAStr = "/onion3/torchdeedp3i2jigzjdmfpn5ttjhthh5wbmda2rr3jvqjg5p77c54dqd:80"
+    let ma = MultiAddress.init(onionMAStr).get()
+    check $(ma[multiCodec("onion3")].tryGet()) == onionMAStr
+
+    let onionMAWithTcpStr = "/onion3/torchdeedp3i2jigzjdmfpn5ttjhthh5wbmda2rr3jvqjg5p77c54dqd:80/tcp/80"
+    let maWithTcp = MultiAddress.init(onionMAWithTcpStr).get()
+    check $(maWithTcp[multiCodec("onion3")].tryGet()) == onionMAStr
+
+
+