mirror of https://github.com/waku-org/nwaku.git
226 lines
7.3 KiB
Nim
226 lines
7.3 KiB
Nim
# Nimbus
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# Copyright (c) 2018 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 implements the Ethereum hexadecimal string formats for JSON
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## See: https://github.com/ethereum/wiki/wiki/JSON-RPC#hex-value-encoding
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#[
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Note:
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The following types are converted to hex strings when marshalled to JSON:
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* Hash256
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* UInt256
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* seq[byte]
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* openArray[seq]
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* PublicKey
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* PrivateKey
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* SymKey
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* Topic
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* Bytes
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]#
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import
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stint, stew/byteutils, eth/[keys, rlp], eth/common/eth_types,
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../../../protocol/v1/waku_protocol
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type
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HexDataStr* = distinct string
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Identifier* = distinct string # 32 bytes, no 0x prefix!
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HexStrings = HexDataStr | Identifier
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# Hex validation
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template hasHexHeader(value: string): bool =
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if value.len >= 2 and value[0] == '0' and value[1] in {'x', 'X'}: true
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else: false
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template isHexChar(c: char): bool =
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if c notin {'0'..'9'} and
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c notin {'a'..'f'} and
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c notin {'A'..'F'}: false
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else: true
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func isValidHexQuantity*(value: string): bool =
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if not value.hasHexHeader:
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return false
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# No leading zeros (but allow 0x0)
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if value.len < 3 or (value.len > 3 and value[2] == '0'): return false
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for i in 2 ..< value.len:
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let c = value[i]
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if not c.isHexChar:
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return false
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return true
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func isValidHexData*(value: string, header = true): bool =
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if header and not value.hasHexHeader:
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return false
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# Must be even number of digits
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if value.len mod 2 != 0: return false
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# Leading zeros are allowed
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for i in 2 ..< value.len:
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let c = value[i]
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if not c.isHexChar:
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return false
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return true
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template isValidHexData(value: string, hexLen: int, header = true): bool =
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value.len == hexLen and value.isValidHexData(header)
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func isValidIdentifier*(value: string): bool =
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# 32 bytes for Whisper ID, no 0x prefix
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result = value.isValidHexData(64, false)
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func isValidPublicKey*(value: string): bool =
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# 65 bytes for Public Key plus 1 byte for 0x prefix
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result = value.isValidHexData(132)
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func isValidPrivateKey*(value: string): bool =
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# 32 bytes for Private Key plus 1 byte for 0x prefix
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result = value.isValidHexData(66)
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func isValidSymKey*(value: string): bool =
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# 32 bytes for Private Key plus 1 byte for 0x prefix
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result = value.isValidHexData(66)
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func isValidHash256*(value: string): bool =
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# 32 bytes for Hash256 plus 1 byte for 0x prefix
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result = value.isValidHexData(66)
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func isValidTopic*(value: string): bool =
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# 4 bytes for Topic plus 1 byte for 0x prefix
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result = value.isValidHexData(10)
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const
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SInvalidData = "Invalid hex data format for Ethereum"
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proc validateHexData*(value: string) {.inline.} =
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if unlikely(not value.isValidHexData):
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raise newException(ValueError, SInvalidData & ": " & value)
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# Initialisation
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proc hexDataStr*(value: string): HexDataStr {.inline.} =
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value.validateHexData
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result = value.HexDataStr
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# Converters for use in RPC
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import json
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from json_rpc/rpcserver import expect
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proc `%`*(value: HexStrings): JsonNode =
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result = %(value.string)
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# Overloads to support expected representation of hex data
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proc `%`*(value: Hash256): JsonNode =
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#result = %("0x" & $value) # More clean but no lowercase :(
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result = %("0x" & value.data.toHex)
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proc `%`*(value: UInt256): JsonNode =
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result = %("0x" & value.toString(16))
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proc `%`*(value: PublicKey): JsonNode =
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result = %("0x04" & $value)
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proc `%`*(value: PrivateKey): JsonNode =
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result = %("0x" & $value)
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proc `%`*(value: SymKey): JsonNode =
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result = %("0x" & value.toHex)
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proc `%`*(value: waku_protocol.Topic): JsonNode =
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result = %("0x" & value.toHex)
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proc `%`*(value: seq[byte]): JsonNode =
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result = %("0x" & value.toHex)
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# Helpers for the fromJson procs
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proc toPublicKey*(key: string): PublicKey {.inline.} =
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result = PublicKey.fromHex(key[4 .. ^1]).tryGet()
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proc toPrivateKey*(key: string): PrivateKey {.inline.} =
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result = PrivateKey.fromHex(key[2 .. ^1]).tryGet()
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proc toSymKey*(key: string): SymKey {.inline.} =
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hexToByteArray(key[2 .. ^1], result)
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proc toTopic*(topic: string): waku_protocol.Topic {.inline.} =
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hexToByteArray(topic[2 .. ^1], result)
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# Marshalling from JSON to Nim types that includes format checking
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func invalidMsg(name: string): string = "When marshalling from JSON, parameter \"" & name & "\" is not valid"
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proc fromJson*(n: JsonNode, argName: string, result: var HexDataStr) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidHexData:
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raise newException(ValueError, invalidMsg(argName) & " as Ethereum data \"" & hexStr & "\"")
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result = hexStr.hexDataStr
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proc fromJson*(n: JsonNode, argName: string, result: var Identifier) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidIdentifier:
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raise newException(ValueError, invalidMsg(argName) & " as a identifier \"" & hexStr & "\"")
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result = hexStr.Identifier
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proc fromJson*(n: JsonNode, argName: string, result: var UInt256) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not (hexStr.len <= 66 and hexStr.isValidHexQuantity):
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raise newException(ValueError, invalidMsg(argName) & " as a UInt256 \"" & hexStr & "\"")
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result = readUintBE[256](hexToPaddedByteArray[32](hexStr))
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proc fromJson*(n: JsonNode, argName: string, result: var PublicKey) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidPublicKey:
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raise newException(ValueError, invalidMsg(argName) & " as a public key \"" & hexStr & "\"")
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result = hexStr.toPublicKey
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proc fromJson*(n: JsonNode, argName: string, result: var PrivateKey) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidPrivateKey:
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raise newException(ValueError, invalidMsg(argName) & " as a private key \"" & hexStr & "\"")
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result = hexStr.toPrivateKey
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proc fromJson*(n: JsonNode, argName: string, result: var SymKey) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidSymKey:
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raise newException(ValueError, invalidMsg(argName) & " as a symmetric key \"" & hexStr & "\"")
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result = toSymKey(hexStr)
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proc fromJson*(n: JsonNode, argName: string, result: var waku_protocol.Topic) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidTopic:
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raise newException(ValueError, invalidMsg(argName) & " as a topic \"" & hexStr & "\"")
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result = toTopic(hexStr)
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# Following procs currently required only for testing, the `createRpcSigs` macro
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# requires it as it will convert the JSON results back to the original Nim
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# types, but it needs the `fromJson` calls for those specific Nim types to do so
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proc fromJson*(n: JsonNode, argName: string, result: var seq[byte]) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidHexData:
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raise newException(ValueError, invalidMsg(argName) & " as a hex data \"" & hexStr & "\"")
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result = hexToSeqByte(hexStr)
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proc fromJson*(n: JsonNode, argName: string, result: var Hash256) =
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.isValidHash256:
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raise newException(ValueError, invalidMsg(argName) & " as a Hash256 \"" & hexStr & "\"")
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hexToByteArray(hexStr, result.data)
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