ethers/lib/utils#splitSignature TypeScript Examples

The following examples show how to use ethers/lib/utils#splitSignature. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: utils.ts    From hypervisor with The Unlicense 6 votes vote down vote up 
signPermitEIP2612 = async (
  owner: Wallet,
  token: Contract,
  spenderAddress: string,
  value: BigNumberish,
  deadline: BigNumberish,
  nonce?: BigNumberish,
) => {
  // get nonce
  nonce = nonce || (await token.nonces(owner.address))
  // get chainId
  const chainId = (await token.provider.getNetwork()).chainId
  // get domain
  const domain = {
    name: 'Uniswap V2',
    version: '1',
    chainId: chainId,
    verifyingContract: token.address,
  }
  // get types
  const types = {} as Record<string, TypedDataField[]>
  types['Permit'] = [
    { name: 'owner', type: 'address' },
    { name: 'spender', type: 'address' },
    { name: 'value', type: 'uint256' },
    { name: 'nonce', type: 'uint256' },
    { name: 'deadline', type: 'uint256' },
  ]
  // get values
  const values = {
    owner: owner.address,
    spender: spenderAddress,
    value: value,
    nonce: nonce,
    deadline: deadline,
  }
  // sign permission
  // todo: add fallback if wallet does not support eip 712 rpc
  const signedPermission = await owner._signTypedData(domain, types, values)
  // split signature
  const sig = splitSignature(signedPermission)
  // return
  return [
    values.owner,
    values.spender,
    values.value,
    values.deadline,
    sig.v,
    sig.r,
    sig.s,
  ]
}
Example #2
Source File: StakingModal.tsx    From dyp with Do What The F*ck You Want To Public License 4 votes vote down vote up 
export default function StakingModal({ isOpen, onDismiss, stakingInfo, userLiquidityUnstaked }: StakingModalProps) {
  const { account, chainId, library } = useActiveWeb3React()

  // track and parse user input
  const [typedValue, setTypedValue] = useState('')
  const { parsedAmount, error } = useDerivedStakeInfo(typedValue, stakingInfo.stakedAmount.token, userLiquidityUnstaked)
  const parsedAmountWrapped = wrappedCurrencyAmount(parsedAmount, chainId)

  let hypotheticalRewardRate: TokenAmount = new TokenAmount(stakingInfo.rewardRate.token, '0')
  if (parsedAmountWrapped?.greaterThan('0')) {
    hypotheticalRewardRate = stakingInfo.getHypotheticalRewardRate(
      stakingInfo.stakedAmount.add(parsedAmountWrapped),
      stakingInfo.totalStakedAmount.add(parsedAmountWrapped),
      stakingInfo.totalRewardRate
    )
  }

  // state for pending and submitted txn views
  const addTransaction = useTransactionAdder()
  const [attempting, setAttempting] = useState<boolean>(false)
  const [hash, setHash] = useState<string | undefined>()
  const wrappedOnDismiss = useCallback(() => {
    setHash(undefined)
    setAttempting(false)
    onDismiss()
  }, [onDismiss])

  // pair contract for this token to be staked
  const dummyPair = new Pair(new TokenAmount(stakingInfo.tokens[0], '0'), new TokenAmount(stakingInfo.tokens[1], '0'))
  const pairContract = usePairContract(dummyPair.liquidityToken.address)

  // approval data for stake
  const deadline = useTransactionDeadline()
  const [signatureData, setSignatureData] = useState<{ v: number; r: string; s: string; deadline: number } | null>(null)
  const [approval, approveCallback] = useApproveCallback(parsedAmount, stakingInfo.stakingRewardAddress)

  const isArgentWallet = useIsArgentWallet()
  const stakingContract = useStakingContract(stakingInfo.stakingRewardAddress)
  async function onStake() {
    setAttempting(true)
    if (stakingContract && parsedAmount && deadline) {
      if (approval === ApprovalState.APPROVED) {
        await stakingContract.stake(`0x${parsedAmount.raw.toString(16)}`, { gasLimit: 350000 })
      } else if (signatureData) {
        stakingContract
          .stakeWithPermit(
            `0x${parsedAmount.raw.toString(16)}`,
            signatureData.deadline,
            signatureData.v,
            signatureData.r,
            signatureData.s,
            { gasLimit: 350000 }
          )
          .then((response: TransactionResponse) => {
            addTransaction(response, {
              summary: `Deposit liquidity`
            })
            setHash(response.hash)
          })
          .catch((error: any) => {
            setAttempting(false)
            console.log(error)
          })
      } else {
        setAttempting(false)
        throw new Error('Attempting to stake without approval or a signature. Please contact support.')
      }
    }
  }

  // wrapped onUserInput to clear signatures
  const onUserInput = useCallback((typedValue: string) => {
    setSignatureData(null)
    setTypedValue(typedValue)
  }, [])

  // used for max input button
  const maxAmountInput = maxAmountSpend(userLiquidityUnstaked)
  const atMaxAmount = Boolean(maxAmountInput && parsedAmount?.equalTo(maxAmountInput))
  const handleMax = useCallback(() => {
    maxAmountInput && onUserInput(maxAmountInput.toExact())
  }, [maxAmountInput, onUserInput])

  async function onAttemptToApprove() {
    if (!pairContract || !library || !deadline) throw new Error('missing dependencies')
    const liquidityAmount = parsedAmount
    if (!liquidityAmount) throw new Error('missing liquidity amount')

    if (isArgentWallet) {
      return approveCallback()
    }

    // try to gather a signature for permission
    const nonce = await pairContract.nonces(account)

    const EIP712Domain = [
      { name: 'name', type: 'string' },
      { name: 'version', type: 'string' },
      { name: 'chainId', type: 'uint256' },
      { name: 'verifyingContract', type: 'address' }
    ]
    const domain = {
      name: 'Uniswap V2',
      version: '1',
      chainId: chainId,
      verifyingContract: pairContract.address
    }
    const Permit = [
      { name: 'owner', type: 'address' },
      { name: 'spender', type: 'address' },
      { name: 'value', type: 'uint256' },
      { name: 'nonce', type: 'uint256' },
      { name: 'deadline', type: 'uint256' }
    ]
    const message = {
      owner: account,
      spender: stakingInfo.stakingRewardAddress,
      value: liquidityAmount.raw.toString(),
      nonce: nonce.toHexString(),
      deadline: deadline.toNumber()
    }
    const data = JSON.stringify({
      types: {
        EIP712Domain,
        Permit
      },
      domain,
      primaryType: 'Permit',
      message
    })

    library
      .send('eth_signTypedData_v4', [account, data])
      .then(splitSignature)
      .then(signature => {
        setSignatureData({
          v: signature.v,
          r: signature.r,
          s: signature.s,
          deadline: deadline.toNumber()
        })
      })
      .catch(error => {
        // for all errors other than 4001 (EIP-1193 user rejected request), fall back to manual approve
        if (error?.code !== 4001) {
          approveCallback()
        }
      })
  }

  return (
    <Modal isOpen={isOpen} onDismiss={wrappedOnDismiss} maxHeight={90}>
      {!attempting && !hash && (
        <ContentWrapper gap="lg">
          <RowBetween>
            <TYPE.mediumHeader>Deposit</TYPE.mediumHeader>
            <CloseIcon onClick={wrappedOnDismiss} />
          </RowBetween>
          <CurrencyInputPanel
            value={typedValue}
            onUserInput={onUserInput}
            onMax={handleMax}
            showMaxButton={!atMaxAmount}
            currency={stakingInfo.stakedAmount.token}
            pair={dummyPair}
            label={''}
            disableCurrencySelect={true}
            customBalanceText={'Available to deposit: '}
            id="stake-liquidity-token"
          />

          <HypotheticalRewardRate dim={!hypotheticalRewardRate.greaterThan('0')}>
            <div>
              <TYPE.black fontWeight={600}>Weekly Rewards</TYPE.black>
            </div>

            <TYPE.black>
              {hypotheticalRewardRate.multiply((60 * 60 * 24 * 7).toString()).toSignificant(4, { groupSeparator: ',' })}{' '}
              UNI / week
            </TYPE.black>
          </HypotheticalRewardRate>

          <RowBetween>
            <ButtonConfirmed
              mr="0.5rem"
              onClick={onAttemptToApprove}
              confirmed={approval === ApprovalState.APPROVED || signatureData !== null}
              disabled={approval !== ApprovalState.NOT_APPROVED || signatureData !== null}
            >
              Approve
            </ButtonConfirmed>
            <ButtonError
              disabled={!!error || (signatureData === null && approval !== ApprovalState.APPROVED)}
              error={!!error && !!parsedAmount}
              onClick={onStake}
            >
              {error ?? 'Deposit'}
            </ButtonError>
          </RowBetween>
          <ProgressCircles steps={[approval === ApprovalState.APPROVED || signatureData !== null]} disabled={true} />
        </ContentWrapper>
      )}
      {attempting && !hash && (
        <LoadingView onDismiss={wrappedOnDismiss}>
          <AutoColumn gap="12px" justify={'center'}>
            <TYPE.largeHeader>Depositing Liquidity</TYPE.largeHeader>
            <TYPE.body fontSize={20}>{parsedAmount?.toSignificant(4)} UNI-V2</TYPE.body>
          </AutoColumn>
        </LoadingView>
      )}
      {attempting && hash && (
        <SubmittedView onDismiss={wrappedOnDismiss} hash={hash}>
          <AutoColumn gap="12px" justify={'center'}>
            <TYPE.largeHeader>Transaction Submitted</TYPE.largeHeader>
            <TYPE.body fontSize={20}>Deposited {parsedAmount?.toSignificant(4)} UNI-V2</TYPE.body>
          </AutoColumn>
        </SubmittedView>
      )}
    </Modal>
  )
}
Example #3
Source File: StakingModal.tsx    From luaswap-interface with GNU General Public License v3.0 4 votes vote down vote up 
export default function StakingModal({ isOpen, onDismiss, stakingInfo, userLiquidityUnstaked }: StakingModalProps) {
  const { account, chainId, library } = useActiveWeb3React()

  // track and parse user input
  const [typedValue, setTypedValue] = useState('')
  const { parsedAmount, error } = useDerivedStakeInfo(typedValue, stakingInfo.stakedAmount.token, userLiquidityUnstaked)
  const parsedAmountWrapped = wrappedCurrencyAmount(parsedAmount, chainId)

  let hypotheticalRewardRate: TokenAmount = new TokenAmount(stakingInfo.rewardRate.token, '0')
  if (parsedAmountWrapped?.greaterThan('0')) {
    hypotheticalRewardRate = stakingInfo.getHypotheticalRewardRate(
      stakingInfo.stakedAmount.add(parsedAmountWrapped),
      stakingInfo.totalStakedAmount.add(parsedAmountWrapped),
      stakingInfo.totalRewardRate
    )
  }

  // state for pending and submitted txn views
  const addTransaction = useTransactionAdder()
  const [attempting, setAttempting] = useState<boolean>(false)
  const [hash, setHash] = useState<string | undefined>()
  const wrappedOnDismiss = useCallback(() => {
    setHash(undefined)
    setAttempting(false)
    onDismiss()
  }, [onDismiss])

  // pair contract for this token to be staked
  const dummyPair = new Pair(new TokenAmount(stakingInfo.tokens[0], '0'), new TokenAmount(stakingInfo.tokens[1], '0'))
  const pairContract = usePairContract(dummyPair.liquidityToken.address)

  // approval data for stake
  const deadline = useTransactionDeadline()
  const [signatureData, setSignatureData] = useState<{ v: number; r: string; s: string; deadline: number } | null>(null)
  const [approval, approveCallback] = useApproveCallback(parsedAmount, stakingInfo.stakingRewardAddress)

  const isArgentWallet = useIsArgentWallet()
  const stakingContract = useStakingContract(stakingInfo.stakingRewardAddress)
  async function onStake() {
    setAttempting(true)
    if (stakingContract && parsedAmount && deadline) {
      if (approval === ApprovalState.APPROVED) {
        await stakingContract.stake(`0x${parsedAmount.raw.toString(16)}`, { gasLimit: 350000 })
      } else if (signatureData) {
        stakingContract
          .stakeWithPermit(
            `0x${parsedAmount.raw.toString(16)}`,
            signatureData.deadline,
            signatureData.v,
            signatureData.r,
            signatureData.s,
            { gasLimit: 350000 }
          )
          .then((response: TransactionResponse) => {
            addTransaction(response, {
              summary: `Deposit liquidity`
            })
            setHash(response.hash)
          })
          .catch((error: any) => {
            setAttempting(false)
            console.log(error)
          })
      } else {
        setAttempting(false)
        throw new Error('Attempting to stake without approval or a signature. Please contact support.')
      }
    }
  }

  // wrapped onUserInput to clear signatures
  const onUserInput = useCallback((typedValue: string) => {
    setSignatureData(null)
    setTypedValue(typedValue)
  }, [])

  // used for max input button
  const maxAmountInput = maxAmountSpend(userLiquidityUnstaked)
  const atMaxAmount = Boolean(maxAmountInput && parsedAmount?.equalTo(maxAmountInput))
  const handleMax = useCallback(() => {
    maxAmountInput && onUserInput(maxAmountInput.toExact())
  }, [maxAmountInput, onUserInput])

  async function onAttemptToApprove() {
    if (!pairContract || !library || !deadline) throw new Error('missing dependencies')
    const liquidityAmount = parsedAmount
    if (!liquidityAmount) throw new Error('missing liquidity amount')

    if (isArgentWallet) {
      return approveCallback()
    }

    // try to gather a signature for permission
    const nonce = await pairContract.nonces(account)

    const EIP712Domain = [
      { name: 'name', type: 'string' },
      { name: 'version', type: 'string' },
      { name: 'chainId', type: 'uint256' },
      { name: 'verifyingContract', type: 'address' }
    ]
    const domain = {
      name: 'LuaSwap LP Token V1',
      version: '1',
      chainId: chainId,
      verifyingContract: pairContract.address
    }
    const Permit = [
      { name: 'owner', type: 'address' },
      { name: 'spender', type: 'address' },
      { name: 'value', type: 'uint256' },
      { name: 'nonce', type: 'uint256' },
      { name: 'deadline', type: 'uint256' }
    ]
    const message = {
      owner: account,
      spender: stakingInfo.stakingRewardAddress,
      value: liquidityAmount.raw.toString(),
      nonce: nonce.toHexString(),
      deadline: deadline.toNumber()
    }
    const data = JSON.stringify({
      types: {
        EIP712Domain,
        Permit
      },
      domain,
      primaryType: 'Permit',
      message
    })

    library
      .send('eth_signTypedData_v4', [account, data])
      .then(splitSignature)
      .then(signature => {
        setSignatureData({
          v: signature.v,
          r: signature.r,
          s: signature.s,
          deadline: deadline.toNumber()
        })
      })
      .catch(error => {
        // for all errors other than 4001 (EIP-1193 user rejected request), fall back to manual approve
        if (error?.code !== 4001) {
          approveCallback()
        }
      })
  }

  return (
    <Modal isOpen={isOpen} onDismiss={wrappedOnDismiss} maxHeight={90}>
      {!attempting && !hash && (
        <ContentWrapper gap="lg">
          <RowBetween>
            <TYPE.mediumHeader>Deposit</TYPE.mediumHeader>
            <CloseIcon onClick={wrappedOnDismiss} />
          </RowBetween>
          <CurrencyInputPanel
            value={typedValue}
            onUserInput={onUserInput}
            onMax={handleMax}
            showMaxButton={!atMaxAmount}
            currency={stakingInfo.stakedAmount.token}
            pair={dummyPair}
            label={''}
            disableCurrencySelect={true}
            customBalanceText={'Available to deposit: '}
            id="stake-liquidity-token"
          />

          <HypotheticalRewardRate dim={!hypotheticalRewardRate.greaterThan('0')}>
            <div>
              <TYPE.black fontWeight={600}>Weekly Rewards</TYPE.black>
            </div>

            <TYPE.black>
              {hypotheticalRewardRate.multiply((60 * 60 * 24 * 7).toString()).toSignificant(4, { groupSeparator: ',' })}{' '}
              LUA / week
            </TYPE.black>
          </HypotheticalRewardRate>

          <RowBetween>
            <ButtonConfirmed
              mr="0.5rem"
              onClick={onAttemptToApprove}
              confirmed={approval === ApprovalState.APPROVED || signatureData !== null}
              disabled={approval !== ApprovalState.NOT_APPROVED || signatureData !== null}
            >
              Approve
            </ButtonConfirmed>
            <ButtonError
              disabled={!!error || (signatureData === null && approval !== ApprovalState.APPROVED)}
              error={!!error && !!parsedAmount}
              onClick={onStake}
            >
              {error ?? 'Deposit'}
            </ButtonError>
          </RowBetween>
          <ProgressCircles steps={[approval === ApprovalState.APPROVED || signatureData !== null]} disabled={true} />
        </ContentWrapper>
      )}
      {attempting && !hash && (
        <LoadingView onDismiss={wrappedOnDismiss}>
          <AutoColumn gap="12px" justify={'center'}>
            <TYPE.largeHeader>Depositing Liquidity</TYPE.largeHeader>
            <TYPE.body fontSize={20}>{parsedAmount?.toSignificant(4)} LUA-V2</TYPE.body>
          </AutoColumn>
        </LoadingView>
      )}
      {attempting && hash && (
        <SubmittedView onDismiss={wrappedOnDismiss} hash={hash}>
          <AutoColumn gap="12px" justify={'center'}>
            <TYPE.largeHeader>Transaction Submitted</TYPE.largeHeader>
            <TYPE.body fontSize={20}>Deposited {parsedAmount?.toSignificant(4)} LUA-V2</TYPE.body>
          </AutoColumn>
        </SubmittedView>
      )}
    </Modal>
  )
}