utils#ERC20_APPROVE_SIGNATURE TypeScript Examples

The following examples show how to use utils#ERC20_APPROVE_SIGNATURE. 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: useABIService.ts    From dxvote with GNU Affero General Public License v3.0 4 votes vote down vote up 
useABIService = (): UseABIServiceReturns => {
  const [ABI, setABI] = useState<DecodedABI>();
  const {
    context: { abiService, providerStore, configStore },
  } = useContext();

  const decodeABI = (params: DecodeABI) => {
    let contract: ContractType | undefined;
    const { data, contractType, contractABI } = params;
    if (contractType) {
      contract = contractType;
    }
    try {
      const abi = abiService.decodeCall(data, contract, contractABI);
      setABI(abi);
      return abi;
    } catch (error) {
      console.error(error);
      return {};
    }
  };

  const decodedCallData = (
    from: string,
    to: string,
    data: string,
    value: BigNumber,
    contractABI: string
  ) => {
    const { library } = providerStore.getActiveWeb3React();
    const recommendedCalls = configStore.getRecommendedCalls();
    let functionSignature = data.substring(0, 10);

    const controllerCallDecoded = abiService.decodeCall(
      data,
      ContractType.Controller
    );
    const decodedAbi = decodeABI({ data, contractABI });

    if (
      controllerCallDecoded &&
      controllerCallDecoded.function.name === 'genericCall'
    ) {
      to = controllerCallDecoded.args[0];
      data = '0x' + controllerCallDecoded.args[1].substring(10);
      value = bnum(controllerCallDecoded.args[3]);
      functionSignature = controllerCallDecoded.args[1].substring(0, 10);
    } else {
      data = '0x' + data.substring(10);
    }

    let asset = ZERO_ADDRESS;
    if (
      functionSignature === ERC20_TRANSFER_SIGNATURE ||
      functionSignature === ERC20_APPROVE_SIGNATURE
    ) {
      asset = to;
    }
    const recommendedCallUsed = recommendedCalls.find(recommendedCall => {
      return (
        asset === recommendedCall.asset &&
        (ANY_ADDRESS === recommendedCall.from ||
          from === recommendedCall.from) &&
        to === recommendedCall.to &&
        functionSignature ===
          library.eth.abi.encodeFunctionSignature(recommendedCall.functionName)
      );
    });

    if (recommendedCallUsed) {
      const callParameters = library.eth.abi.decodeParameters(
        recommendedCallUsed.params.map(param => param.type),
        data
      );

      if (callParameters.__length__) delete callParameters.__length__;

      let encodeFunctionName = library.eth.abi.encodeFunctionSignature(
        recommendedCallUsed.functionName
      );

      return {
        from: from,
        to: to,
        recommendedCallUsed: recommendedCallUsed,
        encodedFunctionName: encodeFunctionName,
        callParameters: callParameters,
        data: data,
        value: value,
        contractABI: decodedAbi,
      };
    }

    return {
      from: from,
      to: to,
      data: data,
      value: value,
      functionSignature: functionSignature,
      contractABI: decodedAbi,
    };
  };

  return {
    ABI,
    decodedCallData,
  };
}