added BASIC-A connector

contracts/optimism/connectors/basic/events.sol

@@ -0,0 +1,6 @@
+pragma solidity ^0.7.0;
+
+contract Events {
+    event LogDeposit(address indexed erc20, uint256 tokenAmt, uint256 getId, uint256 setId);
+    event LogWithdraw(address indexed erc20, uint256 tokenAmt, address indexed to, uint256 getId, uint256 setId);
+}

contracts/optimism/connectors/basic/main.sol

@@ -0,0 +1,81 @@
+pragma solidity ^0.7.0;
+
+/**
+ * @title Basic.
+ * @dev Deposit & Withdraw from DSA.
+ */
+
+import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
+import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+import { DSMath } from "../../common/math.sol";
+import { Basic } from "../../common/basic.sol";
+import { Events } from "./events.sol";
+
+abstract contract BasicResolver is Events, DSMath, Basic {
+    using SafeERC20 for IERC20;
+
+    /**
+     * @dev Deposit Assets To Smart Account.
+     * @notice Deposit a token to DSA. 
+     * @param token The address of the token to deposit.<br>(For <b>ETH</b>: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE and need to pass `value` parameter equal to `amt` in cast function ```dsa.cast({..., value: amt})```.<br>For <b>ERC20</b>: Need to give allowance prior casting spells.)
+     * @param amt The amount of tokens to deposit. (For max: `uint256(-1)` (Not valid for ETH))
+     * @param getId ID to retrieve amt.
+     * @param setId ID stores the amount of tokens deposited.
+     */
+    function deposit(
+        address token,
+        uint256 amt,
+        uint256 getId,
+        uint256 setId
+    ) public payable returns (string memory _eventName, bytes memory _eventParam) {
+        uint _amt = getUint(getId, amt);
+        if (token != ethAddr) {
+            IERC20 tokenContract = IERC20(token);
+            _amt = _amt == uint(-1) ? tokenContract.balanceOf(msg.sender) : _amt;
+            tokenContract.safeTransferFrom(msg.sender, address(this), _amt);
+        } else {
+            require(msg.value == _amt || _amt == uint(-1), "invalid-ether-amount");
+            _amt = msg.value;
+        }
+        setUint(setId, _amt);
+
+        _eventName = "LogDeposit(address,uint256,uint256,uint256)";
+        _eventParam = abi.encode(token, _amt, getId, setId);
+    }
+
+    /**
+     * @dev Withdraw Assets from Smart  Account
+     * @notice Withdraw a token from DSA
+     * @param token The address of the token to withdraw. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+     * @param amt The amount of tokens to withdraw. (For max: `uint256(-1)`)
+     * @param to The address to receive the token upon withdrawal
+     * @param getId ID to retrieve amt.
+     * @param setId ID stores the amount of tokens withdrawn.
+     */
+    function withdraw(
+        address token,
+        uint amt,
+        address payable to,
+        uint getId,
+        uint setId
+    ) public payable returns (string memory _eventName, bytes memory _eventParam) {
+        uint _amt = getUint(getId, amt);
+        if (token == ethAddr) {
+            _amt = _amt == uint(-1) ? address(this).balance : _amt;
+            to.call{value: _amt}("");
+        } else {
+            IERC20 tokenContract = IERC20(token);
+            _amt = _amt == uint(-1) ? tokenContract.balanceOf(address(this)) : _amt;
+            tokenContract.safeTransfer(to, _amt);
+        }
+        setUint(setId, _amt);
+
+        _eventName = "LogWithdraw(address,uint256,address,uint256,uint256)";
+        _eventParam = abi.encode(token, _amt, to, getId, setId);
+    }
+}
+
+contract ConnectV2BasicOptimism is BasicResolver {
+    string constant public name = "Basic-v1";
+}