224 lines
6.3 KiB
Nim
224 lines
6.3 KiB
Nim
# Nim-LibP2P
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# Copyright (c) 2022 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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## This module implementes API for libp2p peer.
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{.push raises: [Defect].}
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{.push public.}
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import
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std/[hashes, strutils],
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stew/[base58, results],
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chronicles,
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nimcrypto/utils,
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utility,
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./crypto/crypto, ./multicodec, ./multihash, ./vbuffer,
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./protobuf/minprotobuf
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export results, utility
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const
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maxInlineKeyLength* = 42
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type
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PeerId* = object
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data*: seq[byte]
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func `$`*(pid: PeerId): string =
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## Return base58 encoded ``pid`` representation.
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# This unusual call syntax is used to avoid a strange Nim compilation error
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base58.encode(Base58, pid.data)
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func shortLog*(pid: PeerId): string =
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## Returns compact string representation of ``pid``.
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var spid = $pid
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if len(spid) > 10:
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spid[3] = '*'
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when (NimMajor, NimMinor) > (1, 4):
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spid.delete(4 .. spid.high - 6)
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else:
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spid.delete(4, spid.high - 6)
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spid
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chronicles.formatIt(PeerId): shortLog(it)
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func toBytes*(pid: PeerId, data: var openArray[byte]): int =
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## Store PeerId ``pid`` to array of bytes ``data``.
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##
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## Returns number of bytes needed to store ``pid``.
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result = len(pid.data)
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if len(data) >= result and result > 0:
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copyMem(addr data[0], unsafeAddr pid.data[0], result)
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template getBytes*(pid: PeerId): seq[byte] =
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## Return PeerId ``pid`` as array of bytes.
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pid.data
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func hex*(pid: PeerId): string =
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## Returns hexadecimal string representation of ``pid``.
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toHex(pid.data)
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template len*(pid: PeerId): int =
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## Returns length of ``pid`` binary representation.
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len(pid.data)
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func cmp*(a, b: PeerId): int =
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## Compares two peer ids ``a`` and ``b``.
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## Returns:
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##
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## | 0 iff a == b
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## | < 0 iff a < b
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## | > 0 iff a > b
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var i = 0
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var m = min(len(a.data), len(b.data))
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while i < m:
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result = ord(a.data[i]) - ord(b.data[i])
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if result != 0: return
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inc(i)
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result = len(a.data) - len(b.data)
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template `<=`*(a, b: PeerId): bool =
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(cmp(a, b) <= 0)
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template `<`*(a, b: PeerId): bool =
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(cmp(a, b) < 0)
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template `>=`*(a, b: PeerId): bool =
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(cmp(a, b) >= 0)
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template `>`*(a, b: PeerId): bool =
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(cmp(a, b) > 0)
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template `==`*(a, b: PeerId): bool =
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(cmp(a, b) == 0)
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template hash*(pid: PeerId): Hash =
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hash(pid.data)
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func validate*(pid: PeerId): bool =
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## Validate check if ``pid`` is empty or not.
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len(pid.data) > 0 and MultiHash.validate(pid.data)
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func hasPublicKey*(pid: PeerId): bool =
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## Returns ``true`` if ``pid`` is small enough to hold public key inside.
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if len(pid.data) > 0:
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var mh: MultiHash
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if MultiHash.decode(pid.data, mh).isOk:
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if mh.mcodec == multiCodec("identity"):
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result = true
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func extractPublicKey*(pid: PeerId, pubkey: var PublicKey): bool =
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## Returns ``true`` if public key was successfully decoded from PeerId
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## ``pid``and stored to ``pubkey``.
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##
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## Returns ``false`` otherwise.
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if len(pid.data) > 0:
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var mh: MultiHash
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if MultiHash.decode(pid.data, mh).isOk:
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if mh.mcodec == multiCodec("identity"):
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let length = len(mh.data.buffer)
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result = pubkey.init(mh.data.buffer.toOpenArray(mh.dpos, length - 1))
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func init*(pid: var PeerId, data: openArray[byte]): bool =
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## Initialize peer id from raw binary representation ``data``.
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##
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## Returns ``true`` if peer was successfully initialiazed.
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var p = PeerId(data: @data)
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if p.validate():
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pid = p
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result = true
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func init*(pid: var PeerId, data: string): bool =
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## Initialize peer id from base58 encoded string representation.
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##
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## Returns ``true`` if peer was successfully initialiazed.
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var p = newSeq[byte](len(data) + 4)
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var length = 0
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if Base58.decode(data, p, length) == Base58Status.Success:
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p.setLen(length)
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var opid: PeerId
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shallowCopy(opid.data, p)
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if opid.validate():
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pid = opid
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result = true
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func init*(t: typedesc[PeerId], data: openArray[byte]): Result[PeerId, cstring] =
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## Create new peer id from raw binary representation ``data``.
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var res: PeerId
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if not init(res, data):
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err("peerid: incorrect PeerId binary form")
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else:
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ok(res)
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func init*(t: typedesc[PeerId], data: string): Result[PeerId, cstring] =
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## Create new peer id from base58 encoded string representation ``data``.
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var res: PeerId
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if not init(res, data):
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err("peerid: incorrect PeerId string")
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else:
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ok(res)
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func init*(t: typedesc[PeerId], pubkey: PublicKey): Result[PeerId, cstring] =
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## Create new peer id from public key ``pubkey``.
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var pubraw = ? pubkey.getBytes().orError(
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cstring("peerid: failed to get bytes from given key"))
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var mh: MultiHash
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if len(pubraw) <= maxInlineKeyLength:
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mh = ? MultiHash.digest("identity", pubraw)
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else:
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mh = ? MultiHash.digest("sha2-256", pubraw)
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ok(PeerId(data: mh.data.buffer))
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func init*(t: typedesc[PeerId], seckey: PrivateKey): Result[PeerId, cstring] =
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## Create new peer id from private key ``seckey``.
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PeerId.init(? seckey.getPublicKey().orError(cstring("invalid private key")))
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func match*(pid: PeerId, pubkey: PublicKey): bool =
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## Returns ``true`` if ``pid`` matches public key ``pubkey``.
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let p = PeerId.init(pubkey)
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if p.isErr:
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false
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else:
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pid == p.get()
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func match*(pid: PeerId, seckey: PrivateKey): bool =
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## Returns ``true`` if ``pid`` matches private key ``seckey``.
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let p = PeerId.init(seckey)
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if p.isErr:
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false
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else:
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pid == p.get()
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## Serialization/Deserialization helpers
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func write*(vb: var VBuffer, pid: PeerId) =
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## Write PeerId value ``peerid`` to buffer ``vb``.
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vb.writeSeq(pid.data)
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func write*(pb: var ProtoBuffer, field: int, pid: PeerId) =
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## Write PeerId value ``peerid`` to object ``pb`` using ProtoBuf's encoding.
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write(pb, field, pid.data)
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func getField*(pb: ProtoBuffer, field: int,
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pid: var PeerId): ProtoResult[bool] {.inline.} =
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## Read ``PeerId`` from ProtoBuf's message and validate it
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var buffer: seq[byte]
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let res = ? pb.getField(field, buffer)
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if not(res):
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ok(false)
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else:
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var peerId: PeerId
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if peerId.init(buffer):
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pid = peerId
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ok(true)
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else:
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err(ProtoError.IncorrectBlob)
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