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95 lines
2.9 KiB
Nim
95 lines
2.9 KiB
Nim
import std/strutils
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type
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HexQuantityStr* = distinct string
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HexDataStr* = distinct string
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# Hex validation
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template stripLeadingZeros(value: string): string =
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var cidx = 0
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# ignore the last character so we retain '0' on zero value
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while cidx < value.len - 1 and value[cidx] == '0':
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cidx.inc
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value[cidx .. ^1]
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func encodeQuantity*(value: SomeUnsignedInt): string =
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var hValue = value.toHex.stripLeadingZeros
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result = "0x" & hValue
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func hasHexHeader*(value: string): bool =
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if value != "" and value[0] == '0' and value[1] in {'x', 'X'} and value.len > 2: true
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else: false
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template hasHexHeader*(value: HexDataStr|HexQuantityStr): bool =
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value.string.hasHexHeader
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func 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 validate*(value: HexQuantityStr): bool =
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template strVal: untyped = value.string
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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 strVal.len < 3 or (strVal.len > 3 and strVal[2] == '0'): return false
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for i in 2..<strVal.len:
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let c = strVal[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 validate*(value: HexDataStr): bool =
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template strVal: untyped = value.string
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if not value.hasHexHeader:
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return false
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# Leading zeros are allowed
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for i in 2..<strVal.len:
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let c = strVal[i]
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if not c.isHexChar:
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return false
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# Must be even number of digits
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if strVal.len mod 2 != 0: return false
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return true
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# Initialisation
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template hexDataStr*(value: string): HexDataStr = value.HexDataStr
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template hexQuantityStr*(value: string): HexQuantityStr = value.HexQuantityStr
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# Converters
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import std/json
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from json_rpc/rpcserver import expect
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func `%`*(value: HexDataStr): JsonNode =
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if not value.validate:
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raise newException(ValueError, "HexDataStr: Invalid hex for Ethereum: " & value.string)
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else:
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result = %(value.string)
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func `%`*(value: HexQuantityStr): JsonNode =
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if not value.validate:
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raise newException(ValueError, "HexQuantityStr: Invalid hex for Ethereum: " & value.string)
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else:
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result = %(value.string)
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func fromJson*(n: JsonNode, argName: string, result: var HexDataStr) =
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# Note that '0x' is stripped after validation
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.hexDataStr.validate:
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raise newException(ValueError, "Parameter \"" & argName & "\" value is not valid as a Ethereum data \"" & hexStr & "\"")
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result = hexStr[2..hexStr.high].hexDataStr
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func fromJson*(n: JsonNode, argName: string, result: var HexQuantityStr) =
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# Note that '0x' is stripped after validation
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n.kind.expect(JString, argName)
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let hexStr = n.getStr()
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if not hexStr.hexQuantityStr.validate:
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raise newException(ValueError, "Parameter \"" & argName & "\" value is not valid as an Ethereum hex quantity \"" & hexStr & "\"")
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result = hexStr[2..hexStr.high].hexQuantityStr
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