Method createUnlocker

packages/cashscript/src/Contract.ts:180–211

(abiFunction: AbiFunction, selector?: number)

  }

  private createUnlocker(abiFunction: AbiFunction, selector?: number): ContractFunctionUnlocker {
    return (...args: FunctionArgument[]) => {
      if (abiFunction.inputs.length !== args.length) {
        throw new Error(`Incorrect number of arguments passed to function ${abiFunction.name}. Expected ${abiFunction.inputs.length} arguments (${abiFunction.inputs.map((input) => input.type)}) but got ${args.length}`);
      }

      const encodedArgs = args
        .map((arg, i) => encodeFunctionArgument(arg, abiFunction.inputs[i].type));

      const generateUnlockingBytecode = (
        { transaction, sourceOutputs, inputIndex }: GenerateUnlockingBytecodeOptions,
      ): Uint8Array => {
        const bytecode = hexToBin(this.bytecode);

        const completeArgs = encodedArgs.map((arg) => {
          if (!(arg instanceof SignatureTemplate)) return arg;

          // Generate transaction signature from SignatureTemplate
          const preimage = createSighashPreimage(transaction, sourceOutputs, inputIndex, bytecode, arg.getHashType());
          const sighash = hash256(preimage);
          return arg.generateSignature(sighash);
        });

        const unlockingBytecode = createUnlockingBytecode(this.contractType, bytecode, completeArgs, selector);
        return unlockingBytecode;
      };

      const generateLockingBytecode = (): Uint8Array => hexToBin(this.lockingBytecode);

      return { generateUnlockingBytecode, generateLockingBytecode, contract: this, params: args, abiFunction };
    };
  }
}

// The public Contract type conditionally removes address/tokenAddress for p2s contracts.