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-rw-r--r--packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol99
-rw-r--r--packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol73
2 files changed, 172 insertions, 0 deletions
diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol
new file mode 100644
index 000000000..b6961a6ec
--- /dev/null
+++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/ERC20Token.sol
@@ -0,0 +1,99 @@
+/*
+
+ Copyright 2018 ZeroEx Intl.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+*/
+
+pragma solidity ^0.4.24;
+pragma experimental ABIEncoderV2;
+
+import "./IERC20Token.sol";
+
+contract ERC20Token is IERC20Token {
+
+ string constant INSUFFICIENT_BALANCE = "ERC20_INSUFFICIENT_BALANCE";
+ string constant INSUFFICIENT_ALLOWANCE = "ERC20_INSUFFICIENT_ALLOWANCE";
+ string constant OVERFLOW = "Transfer would result in an overflow.";
+
+ mapping (address => uint256) balances;
+ mapping (address => mapping (address => uint256)) allowed;
+
+ uint256 public totalSupply;
+
+ function transfer(address _to, uint256 _value)
+ public
+ returns (bool)
+ {
+ require(
+ balances[msg.sender] >= _value,
+ INSUFFICIENT_BALANCE
+ );
+ require(
+ balances[_to] + _value >= balances[_to],
+ OVERFLOW
+ );
+ balances[msg.sender] -= _value;
+ balances[_to] += _value;
+ emit Transfer(msg.sender, _to, _value);
+ return true;
+ }
+
+ function transferFrom(address _from, address _to, uint256 _value)
+ public
+ returns (bool)
+ {
+ require(
+ balances[_from] >= _value,
+ INSUFFICIENT_BALANCE
+ );
+ require(
+ allowed[_from][msg.sender] >= _value,
+ INSUFFICIENT_ALLOWANCE
+ );
+ require(
+ balances[_to] + _value >= balances[_to],
+ OVERFLOW
+ );
+ balances[_to] += _value;
+ balances[_from] -= _value;
+ allowed[_from][msg.sender] -= _value;
+ emit Transfer(_from, _to, _value);
+ return true;
+ }
+
+ function approve(address _spender, uint256 _value)
+ public
+ returns (bool)
+ {
+ allowed[msg.sender][_spender] = _value;
+ emit Approval(msg.sender, _spender, _value);
+ return true;
+ }
+
+ function balanceOf(address _owner)
+ public view
+ returns (uint256)
+ {
+ return balances[_owner];
+ }
+
+ function allowance(address _owner, address _spender)
+ public
+ view
+ returns (uint256)
+ {
+ return allowed[_owner][_spender];
+ }
+}
diff --git a/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol b/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol
new file mode 100644
index 000000000..eb879b6a8
--- /dev/null
+++ b/packages/contracts/src/2.0.0/tokens/ERC20Token/IERC20Token.sol
@@ -0,0 +1,73 @@
+/*
+
+ Copyright 2018 ZeroEx Intl.
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+*/
+
+pragma solidity ^0.4.24;
+pragma experimental ABIEncoderV2;
+
+contract IERC20Token {
+
+ /// @notice send `value` token to `to` from `msg.sender`
+ /// @param _to The address of the recipient
+ /// @param _value The amount of token to be transferred
+ /// @return Whether the transfer was successful or not
+ function transfer(address _to, uint256 _value)
+ public
+ returns (bool);
+
+ /// @notice send `value` token to `to` from `from` on the condition it is approved by `from`
+ /// @param _from The address of the sender
+ /// @param _to The address of the recipient
+ /// @param _value The amount of token to be transferred
+ /// @return Whether the transfer was successful or not
+ function transferFrom(address _from, address _to, uint256 _value)
+ public
+ returns (bool);
+
+ /// @notice `msg.sender` approves `_spender` to spend `_value` tokens
+ /// @param _spender The address of the account able to transfer the tokens
+ /// @param _value The amount of wei to be approved for transfer
+ /// @return Whether the approval was successful or not
+ function approve(address _spender, uint256 _value)
+ public
+ returns (bool);
+
+ /// @param _owner The address from which the balance will be retrieved
+ /// @return The balance
+ function balanceOf(address _owner)
+ public view
+ returns (uint256);
+
+ /// @param _owner The address of the account owning tokens
+ /// @param _spender The address of the account able to transfer the tokens
+ /// @return Amount of remaining tokens allowed to spent
+ function allowance(address _owner, address _spender)
+ public view
+ returns (uint256);
+
+ event Transfer(
+ address indexed _from,
+ address indexed _to,
+ uint256 _value
+ );
+
+ event Approval(
+ address indexed _owner,
+ address indexed _spender,
+ uint256 _value
+ );
+}