96 lines
2.7 KiB
Solidity
96 lines
2.7 KiB
Solidity
// SPDX-License-Identifier: Apache-2.0
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/*
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Copyright 2020 ZeroEx Intl.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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pragma solidity ^0.6.5;
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pragma experimental ABIEncoderV2;
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import "./TestMintableERC20Token.sol";
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contract TestTokenSpenderERC20Token is
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TestMintableERC20Token
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{
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event TransferFromCalled(
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address sender,
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address from,
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address to,
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uint256 amount
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);
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// `transferFrom()` behavior depends on the value of `amount`.
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uint256 constant private EMPTY_RETURN_AMOUNT = 1337;
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uint256 constant private FALSE_RETURN_AMOUNT = 1338;
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uint256 constant private REVERT_RETURN_AMOUNT = 1339;
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uint256 constant private TRIGGER_FALLBACK_SUCCESS_AMOUNT = 1340;
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uint256 constant private EXTRA_RETURN_TRUE_AMOUNT = 1341;
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uint256 constant private EXTRA_RETURN_FALSE_AMOUNT = 1342;
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bool private _isGreedyRevert;
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function setGreedyRevert(bool isGreedy) external {
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_isGreedyRevert = isGreedy;
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}
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function transferFrom(address from, address to, uint256 amount)
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public
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override
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returns (bool)
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{
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emit TransferFromCalled(msg.sender, from, to, amount);
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if (amount == EMPTY_RETURN_AMOUNT) {
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assembly { return(0, 0) }
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}
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if (amount == FALSE_RETURN_AMOUNT) {
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return false;
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}
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if (amount == REVERT_RETURN_AMOUNT) {
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assert(!_isGreedyRevert);
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revert("TestTokenSpenderERC20Token/Revert");
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}
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if (amount == TRIGGER_FALLBACK_SUCCESS_AMOUNT) {
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assert(!_isGreedyRevert);
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return false;
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}
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if (amount == EXTRA_RETURN_TRUE_AMOUNT
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|| amount == EXTRA_RETURN_FALSE_AMOUNT) {
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bool ret = amount == EXTRA_RETURN_TRUE_AMOUNT;
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assembly {
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mstore(0x00, ret)
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mstore(0x20, amount) // just something extra to return
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return(0, 0x40)
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}
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}
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return true;
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}
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function setBalanceAndAllowanceOf(
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address owner,
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uint256 balance,
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address spender,
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uint256 allowance_
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)
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external
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{
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balanceOf[owner] = balance;
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allowance[owner][spender] = allowance_;
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}
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}
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