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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,20 +1,28 @@ | ||
| import 'package:candide_mobile_app/config/network.dart'; | ||
| import 'package:candide_mobile_app/controller/token_info_storage.dart'; | ||
| import 'package:candide_mobile_app/utils/constants.dart'; | ||
| import 'package:wallet_dart/wallet/user_operation.dart'; | ||
|
|
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| class FeeToken { | ||
| TokenInfo token; | ||
| BigInt fee; | ||
| BigInt paymasterFee; | ||
| BigInt exchangeRate; | ||
|
|
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| FeeToken({required this.token, required this.fee, required this.exchangeRate}); | ||
| } | ||
| FeeToken({required this.token, required this.fee, required this.paymasterFee, required this.exchangeRate}); | ||
|
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| class FeeCurrencyUtils { | ||
| static final BigInt costOfPost = BigInt.from(45000); // todo shouldn't be hardcoded | ||
|
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| static BigInt calculateFee(UserOperation op, BigInt exchangeRate, bool isEther) { | ||
| BigInt operationMaxEthCostUsingPaymaster = op.maxFeePerGas * (costOfPost + op.callGasLimit + (op.verificationGasLimit * BigInt.from(isEther ? 1 : 3)) + op.preVerificationGas); | ||
| BigInt tokenToEthPrice = (operationMaxEthCostUsingPaymaster * exchangeRate) ~/ BigInt.from(10).pow(18); | ||
| return tokenToEthPrice; | ||
| BigInt calculateETHFee(UserOperation op, Network network) { | ||
| bool isEther = token.symbol == network.nativeCurrency && token.address == Constants.addressZeroHex; | ||
| BigInt operationMaxEthCost = op.maxFeePerGas * (costOfPost + op.callGasLimit + (op.verificationGasLimit * BigInt.from(isEther ? 1 : 3)) + op.preVerificationGas); | ||
| return operationMaxEthCost; | ||
| } | ||
|
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| BigInt calculateFee(UserOperation op, Network network) { | ||
| BigInt operationMaxEthCost = calculateETHFee(op, network); | ||
| BigInt tokenFee = (operationMaxEthCost * exchangeRate) ~/ BigInt.from(10).pow(18); | ||
| tokenFee += paymasterFee; | ||
| return tokenFee; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| import 'package:candide_mobile_app/config/network.dart'; | ||
| import 'package:candide_mobile_app/models/paymaster/source/paymaster_contract.g.dart'; | ||
| import 'package:candide_mobile_app/utils/constants.dart'; | ||
| import 'package:wallet_dart/wallet/account.dart'; | ||
| import 'package:web3dart/credentials.dart'; | ||
|
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| class GasBackData { | ||
| EthereumAddress paymaster; | ||
| String paymasterAndData; | ||
| bool gasBackApplied; | ||
|
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| GasBackData({required this.paymaster, required this.paymasterAndData, required this.gasBackApplied}); | ||
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| static Future<GasBackData> getGasBackData(Account account, EthereumAddress _paymaster, Network network, BigInt maxETHCost) async { | ||
| PaymasterContract paymasterContract = PaymasterContract(address: _paymaster, client: network.client); | ||
| BigInt accountGasBack = await paymasterContract.gasBackBalances(account.address); | ||
| bool gasBackApplied = accountGasBack >= maxETHCost; | ||
| String paymasterAndData = "0x"; | ||
| if (gasBackApplied){ | ||
| paymasterAndData += _paymaster.hexNo0x; | ||
| paymasterAndData += Constants.addressZero.hexNo0x; // no token | ||
| paymasterAndData += BigInt.from(2).toRadixString(16).padLeft(2, '0'); // paymaster mode = 2 (GAS_BACK) | ||
| paymasterAndData += BigInt.from(0).toRadixString(16).padLeft(12, '0'); // validUntil = 0 (48 bits = 6 bytes = 12 hex chars) | ||
| paymasterAndData += BigInt.from(0).toRadixString(16).padLeft(64, '0'); // fee = 0 (256 bits = 32 bytes = 64 hex chars) | ||
| paymasterAndData += BigInt.from(0).toRadixString(16).padLeft(64, '0'); // exchangeRate = 0 | ||
| } | ||
| return GasBackData( | ||
| paymaster: _paymaster, | ||
| paymasterAndData: paymasterAndData, | ||
| gasBackApplied: gasBackApplied, | ||
| ); | ||
| } | ||
|
|
||
| } |
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