mirror of https://github.com/waku-org/nwaku.git
63 lines
2.3 KiB
Nim
63 lines
2.3 KiB
Nim
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import std/options, chronos, web3, stew/byteutils, stint, strutils
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import waku/incentivization/rpc
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# Function to convert a hex string to Address
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proc toAddress*(hexStr: string): Address =
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# Remove the "0x" prefix if it exists
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let cleaned = if hexStr.startsWith("0x"): hexStr[2..^1] else: hexStr
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# Ensure the length is exactly 40 characters (20 bytes)
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if cleaned.len != 40:
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raise newException(ValueError, "Invalid hexadecimal string length for Address")
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var arr: array[20, byte]
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for i in 0 ..< 20:
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let byteValue = cleaned[i * 2 ..< i * 2 + 2] # Get two hex characters
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arr[i] = byte(parseHexInt(byteValue))
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result = Address(arr)
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proc checkTxIdIsEligible(txHash: TxHash, ethClient: string): Future[bool] {.async.} =
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let web3 = await newWeb3(ethClient)
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try:
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let tx = await web3.provider.eth_getTransactionByHash(txHash)
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let txReceipt = await web3.getMinedTransactionReceipt(txHash)
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result = true
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if result:
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# check that it is not a contract creation tx
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let toAddressOption = txReceipt.to
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let isContractCreationTx = toAddressOption.isNone
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if isContractCreationTx:
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result = false
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else:
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# check that it is a simple transfer (not a contract call)
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# a simple transfer uses 21000 gas
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let gasUsed = txReceipt.gasUsed
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let isSimpleTransferTx = (gasUsed == Quantity(21000))
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if not isSimpleTransferTx:
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result = false
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else:
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# check that the amount is "as expected" (hard-coded for now)
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let txValue = tx.value
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let hasExpectedValue = (txValue == 200500000000005063.u256)
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# check that the to address is "as expected" (hard-coded for now)
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let toAddress = toAddressOption.get()
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let hasExpectedToAddress = (toAddress == toAddress("0x5e809a85aa182a9921edd10a4163745bb3e36284"))
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result = true
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except ValueError as e:
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result = false
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await web3.close()
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result
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proc txidEligiblityCriteriaMet*(
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eligibilityProof: EligibilityProof, ethClient: string
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): Future[bool] {.async.} =
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if eligibilityProof.proofOfPayment.isNone():
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return false
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let txHash = TxHash.fromHex(byteutils.toHex(eligibilityProof.proofOfPayment.get()))
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let txExists = await checkTxIdIsEligible(txHash, ethClient)
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return txExists
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