357 lines
13 KiB
Nim
357 lines
13 KiB
Nim
import
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json_rpc/rpcserver, rpc_types, hexstrings, tables, options, sequtils,
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eth/[common, rlp, keys, p2p], eth/p2p/rlpx_protocols/whisper_protocol,
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nimcrypto/[sysrand, hmac, sha2, pbkdf2]
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from stew/byteutils import hexToSeqByte, hexToByteArray
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# Whisper RPC implemented mostly as in
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# https://github.com/ethereum/go-ethereum/wiki/Whisper-v6-RPC-API
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type
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WhisperKeys* = ref object
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asymKeys*: Table[string, KeyPair]
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symKeys*: Table[string, SymKey]
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KeyGenerationError = object of CatchableError
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proc newWhisperKeys*(): WhisperKeys =
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new(result)
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result.asymKeys = initTable[string, KeyPair]()
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result.symKeys = initTable[string, SymKey]()
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proc setupWhisperRPC*(node: EthereumNode, keys: WhisperKeys, rpcsrv: RpcServer) =
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rpcsrv.rpc("shh_version") do() -> string:
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## Returns string of the current whisper protocol version.
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result = whisperVersionStr
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rpcsrv.rpc("shh_info") do() -> WhisperInfo:
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## Returns diagnostic information about the whisper node.
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let config = node.protocolState(Whisper).config
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result = WhisperInfo(minPow: config.powRequirement,
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maxMessageSize: config.maxMsgSize,
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memory: 0,
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messages: 0)
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# TODO: uint32 instead of uint64 is OK here, but needs to be added in json_rpc
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rpcsrv.rpc("shh_setMaxMessageSize") do(size: uint64) -> bool:
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## Sets the maximal message size allowed by this node.
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## Incoming and outgoing messages with a larger size will be rejected.
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## Whisper message size can never exceed the limit imposed by the underlying
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## P2P protocol (10 Mb).
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##
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## size: Message size in bytes.
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##
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## Returns true on success and an error on failure.
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result = node.setMaxMessageSize(size.uint32)
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if not result:
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raise newException(ValueError, "Invalid size")
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rpcsrv.rpc("shh_setMinPoW") do(pow: float) -> bool:
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## Sets the minimal PoW required by this node.
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##
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## pow: The new PoW requirement.
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##
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## Returns true on success and an error on failure.
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# Note: If any of the `peer.powRequirement` calls fails, we do not care and
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# don't see this as an error. Could move this to `setPowRequirement` if
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# this is the general behaviour we want.
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try:
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waitFor node.setPowRequirement(pow)
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except:
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trace "setPowRequirement error occured"
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result = true
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# TODO: change string in to ENodeStr with extra checks
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rpcsrv.rpc("shh_markTrustedPeer") do(enode: string) -> bool:
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## Marks specific peer trusted, which will allow it to send historic
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## (expired) messages.
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## Note: This function is not adding new nodes, the node needs to exists as
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## a peer.
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##
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## enode: Enode of the trusted peer.
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##
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## Returns true on success and an error on failure.
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# TODO: It will now require an enode://pubkey@ip:port uri
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# could also accept only the pubkey (like geth)?
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let peerNode = newNode(enode)
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result = node.setPeerTrusted(peerNode.id)
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if not result:
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raise newException(ValueError, "Not a peer")
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rpcsrv.rpc("shh_newKeyPair") do() -> Identifier:
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## Generates a new public and private key pair for message decryption and
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## encryption.
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##
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## Returns key identifier on success and an error on failure.
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result = generateRandomID().Identifier
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keys.asymKeys.add(result.string, newKeyPair())
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rpcsrv.rpc("shh_addPrivateKey") do(key: PrivateKey) -> Identifier:
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## Stores the key pair, and returns its ID.
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##
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## key: Private key as hex bytes.
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##
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## Returns key identifier on success and an error on failure.
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result = generateRandomID().Identifier
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keys.asymKeys.add(result.string, KeyPair(seckey: key,
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pubkey: key.getPublicKey()))
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rpcsrv.rpc("shh_deleteKeyPair") do(id: Identifier) -> bool:
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## Deletes the specifies key if it exists.
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##
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## id: Identifier of key pair
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##
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## Returns true on success and an error on failure.
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var unneeded: KeyPair
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result = keys.asymKeys.take(id.string, unneeded)
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if not result:
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raise newException(ValueError, "Invalid key id")
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rpcsrv.rpc("shh_hasKeyPair") do(id: Identifier) -> bool:
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## Checks if the whisper node has a private key of a key pair matching the
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## given ID.
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##
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## id: Identifier of key pair
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##
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## Returns (true or false) on success and an error on failure.
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result = keys.asymkeys.hasKey(id.string)
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rpcsrv.rpc("shh_getPublicKey") do(id: Identifier) -> PublicKey:
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## Returns the public key for identity ID.
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##
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## id: Identifier of key pair
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##
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## Returns public key on success and an error on failure.
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# Note: key not found exception as error in case not existing
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result = keys.asymkeys[id.string].pubkey
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rpcsrv.rpc("shh_getPrivateKey") do(id: Identifier) -> PrivateKey:
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## Returns the private key for identity ID.
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##
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## id: Identifier of key pair
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##
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## Returns private key on success and an error on failure.
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# Note: key not found exception as error in case not existing
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result = keys.asymkeys[id.string].seckey
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rpcsrv.rpc("shh_newSymKey") do() -> Identifier:
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## Generates a random symmetric key and stores it under an ID, which is then
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## returned. Can be used encrypting and decrypting messages where the key is
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## known to both parties.
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##
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## Returns key identifier on success and an error on failure.
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result = generateRandomID().Identifier
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var key: SymKey
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if randomBytes(key) != key.len:
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raise newException(KeyGenerationError, "Failed generating key")
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keys.symKeys.add(result.string, key)
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rpcsrv.rpc("shh_addSymKey") do(key: SymKey) -> Identifier:
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## Stores the key, and returns its ID.
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##
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## key: The raw key for symmetric encryption as hex bytes.
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##
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## Returns key identifier on success and an error on failure.
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result = generateRandomID().Identifier
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keys.symKeys.add(result.string, key)
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rpcsrv.rpc("shh_generateSymKeyFromPassword") do(password: string) -> Identifier:
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## Generates the key from password, stores it, and returns its ID.
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##
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## password: Password.
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##
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## Returns key identifier on success and an error on failure.
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## Warning: an empty string is used as salt because the shh RPC API does not
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## allow for passing a salt. A very good password is necessary (calculate
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## yourself what that means :))
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var ctx: HMAC[sha256]
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var symKey: SymKey
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if pbkdf2(ctx, password, "", 65356, symKey) != sizeof(SymKey):
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raise newException(KeyGenerationError, "Failed generating key")
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result = generateRandomID().Identifier
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keys.symKeys.add(result.string, symKey)
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rpcsrv.rpc("shh_hasSymKey") do(id: Identifier) -> bool:
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## Returns true if there is a key associated with the name string.
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## Otherwise, returns false.
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##
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## id: Identifier of key.
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##
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## Returns (true or false) on success and an error on failure.
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result = keys.symkeys.hasKey(id.string)
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rpcsrv.rpc("shh_getSymKey") do(id: Identifier) -> SymKey:
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## Returns the symmetric key associated with the given ID.
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##
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## id: Identifier of key.
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##
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## Returns Raw key on success and an error on failure.
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# Note: key not found exception as error in case not existing
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result = keys.symkeys[id.string]
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rpcsrv.rpc("shh_deleteSymKey") do(id: Identifier) -> bool:
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## Deletes the key associated with the name string if it exists.
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##
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## id: Identifier of key.
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##
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## Returns (true or false) on success and an error on failure.
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var unneeded: SymKey
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result = keys.symKeys.take(id.string, unneeded)
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if not result:
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raise newException(ValueError, "Invalid key id")
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rpcsrv.rpc("shh_subscribe") do(id: string,
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options: WhisperFilterOptions) -> Identifier:
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## Creates and registers a new subscription to receive notifications for
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## inbound whisper messages. Returns the ID of the newly created
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## subscription.
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##
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## id: identifier of function call. In case of Whisper must contain the
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## value "messages".
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## options: WhisperFilterOptions
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##
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## Returns the subscription ID on success, the error on failure.
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# TODO: implement subscriptions, only for WS & IPC?
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discard
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rpcsrv.rpc("shh_unsubscribe") do(id: Identifier) -> bool:
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## Cancels and removes an existing subscription.
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##
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## id: Subscription identifier
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##
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## Returns true on success, the error on failure
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result = node.unsubscribeFilter(id.string)
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if not result:
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raise newException(ValueError, "Invalid filter id")
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proc validateOptions[T,U,V](asym: Option[T], sym: Option[U], topic: Option[V]) =
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if (asym.isSome() and sym.isSome()) or (asym.isNone() and sym.isNone()):
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raise newException(ValueError,
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"Either privateKeyID/pubKey or symKeyID must be present")
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if asym.isNone() and topic.isNone():
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raise newException(ValueError, "Topic mandatory with symmetric key")
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rpcsrv.rpc("shh_newMessageFilter") do(options: WhisperFilterOptions) -> Identifier:
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## Create a new filter within the node. This filter can be used to poll for
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## new messages that match the set of criteria.
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##
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## options: WhisperFilterOptions
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##
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## Returns filter identifier on success, error on failure
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# Check if either symKeyID or privateKeyID is present, and not both
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# Check if there are Topics when symmetric key is used
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validateOptions(options.privateKeyID, options.symKeyID, options.topics)
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var filter: Filter
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if options.privateKeyID.isSome():
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filter.privateKey = some(keys.asymKeys[options.privateKeyID.get().string].seckey)
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if options.symKeyID.isSome():
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filter.symKey= some(keys.symKeys[options.symKeyID.get().string])
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filter.src = options.sig
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if options.minPow.isSome():
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filter.powReq = options.minPow.get()
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if options.topics.isSome():
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filter.topics = options.topics.get()
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if options.allowP2P.isSome():
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filter.allowP2P = options.allowP2P.get()
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result = node.subscribeFilter(filter).Identifier
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rpcsrv.rpc("shh_deleteMessageFilter") do(id: Identifier) -> bool:
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## Uninstall a message filter in the node.
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##
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## id: Filter identifier as returned when the filter was created.
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##
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## Returns true on success, error on failure.
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result = node.unsubscribeFilter(id.string)
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if not result:
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raise newException(ValueError, "Invalid filter id")
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rpcsrv.rpc("shh_getFilterMessages") do(id: Identifier) -> seq[WhisperFilterMessage]:
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## Retrieve messages that match the filter criteria and are received between
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## the last time this function was called and now.
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##
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## id: ID of filter that was created with `shh_newMessageFilter`.
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##
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## Returns array of messages on success and an error on failure.
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let messages = node.getFilterMessages(id.string)
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for msg in messages:
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var filterMsg: WhisperFilterMessage
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filterMsg.sig = msg.decoded.src
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filterMsg.recipientPublicKey = msg.dst
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filterMsg.ttl = msg.ttl
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filterMsg.topic = msg.topic
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filterMsg.timestamp = msg.timestamp
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filterMsg.payload = msg.decoded.payload
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# Note: whisper_protocol padding is an Option as there is the
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# possibility of 0 padding in case of custom padding.
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if msg.decoded.padding.isSome():
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filterMsg.padding = msg.decoded.padding.get()
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filterMsg.pow = msg.pow
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filterMsg.hash = msg.hash
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result.add(filterMsg)
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rpcsrv.rpc("shh_post") do(message: WhisperPostMessage) -> bool:
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## Creates a whisper message and injects it into the network for
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## distribution.
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##
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## message: Whisper message to post.
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##
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## Returns true on success and an error on failure.
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# Check if either symKeyID or pubKey is present, and not both
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# Check if there is a Topic when symmetric key is used
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validateOptions(message.pubKey, message.symKeyID, message.topic)
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var
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sigPrivKey: Option[PrivateKey]
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symKey: Option[SymKey]
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topic: whisper_protocol.Topic
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padding: Option[Bytes]
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targetPeer: Option[NodeId]
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if message.sig.isSome():
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sigPrivKey = some(keys.asymKeys[message.sig.get().string].seckey)
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if message.symKeyID.isSome():
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symKey = some(keys.symKeys[message.symKeyID.get().string])
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# Note: If no topic it will be defaulted to 0x00000000
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if message.topic.isSome():
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topic = message.topic.get()
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if message.padding.isSome():
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padding = some(hexToSeqByte(message.padding.get().string))
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if message.targetPeer.isSome():
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targetPeer = some(newNode(message.targetPeer.get()).id)
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result = node.postMessage(message.pubKey,
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symKey,
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sigPrivKey,
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ttl = message.ttl.uint32,
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topic = topic,
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payload = hexToSeqByte(message.payload.string),
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padding = padding,
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powTime = message.powTime,
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powTarget = message.powTarget,
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targetPeer = targetPeer)
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if not result:
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raise newException(ValueError, "Message could not be posted")
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