138 lines
4.0 KiB
Nim
138 lines
4.0 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import options, strformat
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import chronos, chronicles
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import ../protobuf/minprotobuf,
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../peerinfo,
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../connection,
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../peer,
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../crypto/crypto,
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../multiaddress,
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../protocols/protocol
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logScope:
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topic = "identify"
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const IdentifyCodec* = "/ipfs/id/1.0.0"
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const IdentifyPushCodec* = "/ipfs/id/push/1.0.0"
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const ProtoVersion* = "ipfs/0.1.0"
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const AgentVersion* = "nim-libp2p/0.0.1"
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#TODO: implment push identify, leaving out for now as it is not essential
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type
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IdentityNoMatchError* = object of CatchableError
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IdentityInvalidMsgError* = object of CatchableError
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IdentifyInfo* = object
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pubKey*: Option[PublicKey]
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addrs*: seq[MultiAddress]
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observedAddr*: Option[MultiAddress]
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protoVersion*: Option[string]
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agentVersion*: Option[string]
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protos*: seq[string]
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Identify* = ref object of LPProtocol
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peerInfo*: PeerInfo
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proc encodeMsg*(peerInfo: PeerInfo, observedAddrs: Multiaddress): ProtoBuffer =
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result = initProtoBuffer()
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if peerInfo.peerId.isSome:
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result.write(initProtoField(1, peerInfo.peerId.get().publicKey.get().getBytes()))
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for ma in peerInfo.addrs:
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result.write(initProtoField(2, ma.data.buffer))
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for proto in peerInfo.protocols:
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result.write(initProtoField(3, proto))
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result.write(initProtoField(4, observedAddrs.data.buffer))
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let protoVersion = ProtoVersion
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result.write(initProtoField(5, protoVersion))
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let agentVersion = AgentVersion
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result.write(initProtoField(6, agentVersion))
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result.finish()
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proc decodeMsg*(buf: seq[byte]): IdentifyInfo =
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var pb = initProtoBuffer(buf)
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result.pubKey = none(PublicKey)
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var pubKey: PublicKey
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if pb.getValue(1, pubKey) > 0:
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result.pubKey = some(pubKey)
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result.addrs = newSeq[MultiAddress]()
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var address = newSeq[byte]()
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while pb.getBytes(2, address) > 0:
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if len(address) != 0:
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var copyaddr = address
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result.addrs.add(MultiAddress.init(copyaddr))
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address.setLen(0)
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var proto = ""
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while pb.getString(3, proto) > 0:
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result.protos.add(proto)
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proto = ""
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var observableAddr = newSeq[byte]()
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if pb.getBytes(4, observableAddr) > 0: # attempt to read the observed addr
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result.observedAddr = some(MultiAddress.init(observableAddr))
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var protoVersion = ""
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if pb.getString(5, protoVersion) > 0:
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result.protoVersion = some(protoVersion)
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var agentVersion = ""
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if pb.getString(6, agentVersion) > 0:
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result.agentVersion = some(protoVersion)
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proc newIdentify*(peerInfo: PeerInfo): Identify =
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new result
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result.peerInfo = peerInfo
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result.init()
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method init*(p: Identify) =
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proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
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trace "handling identify request"
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var pb = encodeMsg(p.peerInfo, await conn.getObservedAddrs())
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await conn.writeLp(pb.buffer)
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p.handler = handle
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p.codec = IdentifyCodec
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proc identify*(p: Identify,
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conn: Connection,
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remotePeerInfo: PeerInfo):
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Future[IdentifyInfo] {.async.} =
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var message = await conn.readLp()
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if len(message) == 0:
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trace "identify: Invalid or empty message received!"
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raise newException(IdentityInvalidMsgError,
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"Invalid or empty message received!")
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result = decodeMsg(message)
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trace "Identify for remote peer succeded"
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if remotePeerInfo.peerId.isSome and
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result.pubKey.isSome and
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result.pubKey != remotePeerInfo.peerId.get().publicKey:
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trace "identify: Peer's remote public key doesn't match"
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raise newException(IdentityNoMatchError,
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"Peer's remote public key doesn't match")
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proc push*(p: Identify, conn: Connection) {.async.} =
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await conn.write(IdentifyPushCodec)
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var pb = encodeMsg(p.peerInfo, await conn.getObservedAddrs())
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let length = pb.getLen()
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await conn.writeLp(pb.buffer)
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