mirror of https://github.com/waku-org/nwaku.git
Add encoding/decoding of payload for Waku v2 (#251)
* Add encoding/decoding of payload for Waku v2 * Allow for Waku v1 payload in chat through compile time flag
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@ -3,7 +3,8 @@ when not(compileOption("threads")):
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import std/[tables, strformat, strutils]
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import confutils, chronicles, chronos, stew/shims/net as stewNet,
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eth/keys, bearssl, stew/[byteutils, endians2]
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eth/keys, bearssl, stew/[byteutils, endians2],
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nimcrypto/pbkdf2
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import libp2p/[switch, # manage transports, a single entry point for dialing and listening
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multistream, # tag stream with short header to identify it
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crypto/crypto, # cryptographic functions
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@ -18,7 +19,7 @@ import libp2p/[switch, # manage transports, a single entry poi
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protocols/secure/secio, # define the protocol of secure input / output, allows encrypted communication that uses public keys to validate signed messages instead of a certificate authority like in TLS
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muxers/muxer, # define an interface for stream multiplexing, allowing peers to offer many protocols over a single connection
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muxers/mplex/mplex] # define some contants and message types for stream multiplexing
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import ../../waku/node/v2/[config, wakunode2, waku_types],
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import ../../waku/node/v2/[config, wakunode2, waku_types, waku_payload],
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../../waku/protocol/v2/[waku_relay, waku_store, waku_filter],
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../../waku/node/common
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@ -30,10 +31,12 @@ const Help = """
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exit: closes the chat
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"""
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const DefaultTopic = "/waku/2/default-waku/proto"
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const
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PayloadV1* {.booldefine.} = false
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DefaultTopic = "/waku/2/default-waku/proto"
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const Dingpu = "dingpu".toBytes
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const DefaultContentTopic = ContentTopic(uint32.fromBytes(Dingpu))
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Dingpu = "dingpu".toBytes
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DefaultContentTopic = ContentTopic(uint32.fromBytes(Dingpu))
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# XXX Connected is a bit annoying, because incoming connections don't trigger state change
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# Could poll connection pool or something here, I suppose
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@ -49,6 +52,18 @@ type
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PrivateKey* = crypto.PrivateKey
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Topic* = waku_types.Topic
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# Similarly as Status public chats now.
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proc generateSymKey(contentTopic: ContentTopic): SymKey =
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var ctx: HMAC[sha256]
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var symKey: SymKey
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if pbkdf2(ctx, contentTopic.toBytes(), "", 65356, symKey) != sizeof(SymKey):
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raise (ref Defect)(msg: "Should not occur as array is properly sized")
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symKey
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let DefaultSymKey = generateSymKey(DefaultContentTopic)
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proc initAddress(T: type MultiAddress, str: string): T =
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let address = MultiAddress.init(str).tryGet()
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if IPFS.match(address) and matchPartial(multiaddress.TCP, address):
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@ -68,9 +83,23 @@ proc connectToNodes(c: Chat, nodes: seq[string]) {.async.} =
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c.connected = true
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proc publish(c: Chat, line: string) =
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let payload = cast[seq[byte]](line)
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let message = WakuMessage(payload: payload, contentTopic: DefaultContentTopic)
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c.node.publish(DefaultTopic, message)
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when PayloadV1:
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# Use Waku v1 payload encoding/encryption
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let
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payload = Payload(payload: line.toBytes(), symKey: some(DefaultSymKey))
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version = 1'u32
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encodedPayload = payload.encode(version, c.node.rng[])
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if encodedPayload.isOk():
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let message = WakuMessage(payload: encodedPayload.get(),
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contentTopic: DefaultContentTopic, version: version)
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c.node.publish(DefaultTopic, message)
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else:
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warn "Payload encoding failed", error = encodedPayload.error
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else:
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# No payload encoding/encryption from Waku
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let message = WakuMessage(payload: line.toBytes(),
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contentTopic: DefaultContentTopic, version: 0)
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c.node.publish(DefaultTopic, message)
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# TODO This should read or be subscribe handler subscribe
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proc readAndPrint(c: Chat) {.async.} =
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@ -156,7 +185,6 @@ proc processInput(rfd: AsyncFD, rng: ref BrHmacDrbgContext) {.async.} =
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node = WakuNode.init(conf.nodeKey, conf.listenAddress,
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Port(uint16(conf.tcpPort) + conf.portsShift), extIp, extTcpPort)
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# waitFor vs await
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await node.start()
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if conf.filternode != "":
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@ -180,7 +208,7 @@ proc processInput(rfd: AsyncFD, rng: ref BrHmacDrbgContext) {.async.} =
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proc storeHandler(response: HistoryResponse) {.gcsafe.} =
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for msg in response.messages:
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let payload = cast[string](msg.payload)
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let payload = string.fromBytes(msg.payload)
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echo &"{payload}"
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info "Hit store handler"
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@ -192,7 +220,7 @@ proc processInput(rfd: AsyncFD, rng: ref BrHmacDrbgContext) {.async.} =
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node.wakuFilter.setPeer(parsePeer(conf.filternode))
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proc filterHandler(msg: WakuMessage) {.gcsafe.} =
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let payload = cast[string](msg.payload)
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let payload = string.fromBytes(msg.payload)
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echo &"{payload}"
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info "Hit filter handler"
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@ -205,10 +233,31 @@ proc processInput(rfd: AsyncFD, rng: ref BrHmacDrbgContext) {.async.} =
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# TODO To get end to end sender would require more information in payload
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# We could possibly indicate the relayer point with connection somehow probably (?)
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proc handler(topic: Topic, data: seq[byte]) {.async, gcsafe.} =
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let message = WakuMessage.init(data).value
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let payload = cast[string](message.payload)
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echo &"{payload}"
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info "Hit subscribe handler", topic=topic, payload=payload, contentTopic=message.contentTopic
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let decoded = WakuMessage.init(data)
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if decoded.isOk():
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let msg = decoded.get()
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when PayloadV1:
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# Use Waku v1 payload encoding/encryption
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let
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keyInfo = KeyInfo(kind: Symmetric, symKey: DefaultSymKey)
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decodedPayload = decodePayload(decoded.get(), keyInfo)
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if decodedPayload.isOK():
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let payload = string.fromBytes(decodedPayload.get().payload)
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echo &"{payload}"
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info "Hit subscribe handler", topic, payload,
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contentTopic = msg.contentTopic
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else:
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debug "Invalid encoded WakuMessage payload",
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error = decodedPayload.error
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else:
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# No payload encoding/encryption from Waku
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let payload = string.fromBytes(msg.payload)
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echo &"{payload}"
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info "Hit subscribe handler", topic, payload,
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contentTopic = msg.contentTopic
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else:
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trace "Invalid encoded WakuMessage", error = decoded.error
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let topic = cast[Topic](DefaultTopic)
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await node.subscribe(topic, handler)
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@ -5,5 +5,6 @@ import
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./v2/test_wakunode,
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./v2/test_waku_store,
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./v2/test_waku_filter,
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./v2/test_rpc_waku,
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./v2/test_waku_pagination
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./v2/test_waku_pagination,
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./v2/test_waku_payload,
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./v2/test_rpc_waku
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@ -0,0 +1,111 @@
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{.used.}
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import
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std/unittest,
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../../waku/node/v2/waku_payload,
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../test_helpers
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procSuite "Waku Payload":
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let rng = newRng()
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test "Encode/Decode without encryption (version 0)":
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## This would be the usual way when no encryption is done or when it is done
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## on the application layer.
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# Encoding
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let
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version = 0'u32
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payload = @[byte 0, 1, 2]
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msg = WakuMessage(payload: payload, version: version)
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pb = msg.encode()
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# Decoding
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let msgDecoded = WakuMessage.init(pb.buffer)
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check msgDecoded.isOk()
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let
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keyInfo = KeyInfo(kind:None)
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decoded = decodePayload(msgDecoded.get(), keyInfo)
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check:
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decoded.isOk()
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decoded.get().payload == payload
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test "Encode/Decode without encryption (version 0) with encodePayload":
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## This is a bit silly and only there for completeness
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# Encoding
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let
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version = 0'u32
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payload = Payload(payload: @[byte 0, 1, 2])
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encodedPayload = payload.encode(version, rng[])
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check encodedPayload.isOk()
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let
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msg = WakuMessage(payload: encodedPayload.get(), version: version)
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pb = msg.encode()
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# Decoding
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let msgDecoded = WakuMessage.init(pb.buffer)
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check msgDecoded.isOk()
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let
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keyInfo = KeyInfo(kind:None)
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decoded = decodePayload(msgDecoded.get(), keyInfo)
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check:
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decoded.isOk()
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decoded.get().payload == payload.payload
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test "Encode/Decode with encryption (version 1)":
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# Encoding
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let
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privKey = PrivateKey.random(rng[])
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version = 1'u32
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payload = Payload(payload: @[byte 0, 1, 2],
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dst: some(privKey.toPublicKey()))
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encodedPayload = payload.encode(version, rng[])
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check encodedPayload.isOk()
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let
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msg = WakuMessage(payload: encodedPayload.get(), version: version)
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pb = msg.encode()
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# Decoding
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let msgDecoded = WakuMessage.init(pb.buffer)
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check msgDecoded.isOk()
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let
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keyInfo = KeyInfo(kind: Asymmetric, privKey: privKey)
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decoded = decodePayload(msgDecoded.get(), keyInfo)
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check:
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decoded.isOk()
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decoded.get().payload == payload.payload
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test "Encode with unsupported version":
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let
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version = 2'u32
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payload = Payload(payload: @[byte 0, 1, 2])
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encodedPayload = payload.encode(version, rng[])
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check encodedPayload.isErr()
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test "Decode with unsupported version":
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# Encoding
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let
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version = 2'u32
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payload = @[byte 0, 1, 2]
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msg = WakuMessage(payload: payload, version: version)
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pb = msg.encode()
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# Decoding
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let msgDecoded = WakuMessage.init(pb.buffer)
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check msgDecoded.isOk()
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let
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keyInfo = KeyInfo(kind:None)
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decoded = decodePayload(msgDecoded.get(), keyInfo)
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check:
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decoded.isErr()
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@ -0,0 +1,73 @@
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import
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std/options,
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eth/keys,
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eth/p2p/rlpx_protocols/whisper/whisper_types,
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./waku_types
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export whisper_types, waku_types, keys, options
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type
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KeyKind* = enum
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Symmetric
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Asymmetric
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None
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KeyInfo* = object
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case kind*: KeyKind
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of Symmetric:
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symKey*: SymKey
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of Asymmetric:
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privKey*: PrivateKey
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of None:
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discard
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# TODO:
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# - This is using `DecodedPayload` from Waku v1 / Whisper and could be altered
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# by making that a case object also, e.g. useful for the version 0, but
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# especially in the future if there would be yet another version.
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# - Also reworking that API to use Result instead of Option could make this
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# cleaner.
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# - For now this `KeyInfo` is a bit silly also, but perhaps with v2 or
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# adjustments to Waku v1 encoding, it can be better.
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proc decodePayload*(message: WakuMessage, keyInfo: KeyInfo):
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WakuResult[DecodedPayload] =
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case message.version
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of 0:
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return ok(DecodedPayload(payload:message.payload))
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of 1:
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case keyInfo.kind
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of Symmetric:
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let decoded = message.payload.decode(none[PrivateKey](),
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some(keyInfo.symKey))
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if decoded.isSome():
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return ok(decoded.get())
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else:
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return err("Couldn't decrypt using symmetric key")
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of Asymmetric:
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let decoded = message.payload.decode(some(keyInfo.privkey),
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none[SymKey]())
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if decoded.isSome():
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return ok(decoded.get())
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else:
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return err("Couldn't decrypt using asymmetric key")
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of None:
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discard
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else:
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return err("Unsupported WakuMessage version")
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# TODO: same story as for `decodedPayload`, but then regarding the `Payload`
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# object.
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proc encode*(payload: Payload, version: uint32, rng: var BrHmacDrbgContext):
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WakuResult[seq[byte]] =
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case version
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of 0:
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# This is rather silly
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return ok(payload.payload)
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of 1:
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let encoded = encode(rng, payload)
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if encoded.isSome():
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return ok(encoded.get())
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else:
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return err("Couldn't encode the payload")
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else:
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return err("Unsupported WakuMessage version")
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@ -144,6 +144,8 @@ type
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listenStr*: string
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#multiaddrStrings*: seq[string]
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WakuResult*[T] = Result[T, cstring]
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# Encoding and decoding -------------------------------------------------------
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proc init*(T: type WakuMessage, buffer: seq[byte]): ProtoResult[T] =
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