Merge pull request #22 from Instadapp/polygon-connectors

Mainnet <> Polygon bridge connectors

contracts/mainnet/connectors/polygon-bridge/events.sol

@@ -0,0 +1,12 @@
+pragma solidity ^0.7.0;
+
+contract Events {
+    event LogDeposit(
+        address targetDsa,
+        address token,
+        uint256 amt,
+        uint256 getId,
+        uint256 setId
+    );
+    event LogWithdraw(bytes proof);
+}

contracts/mainnet/connectors/polygon-bridge/helpers.sol

@@ -0,0 +1,17 @@
+pragma solidity ^0.7.0;
+
+import { DSMath } from "../../common/math.sol";
+import { Basic } from "../../common/basic.sol";
+import { RootChainManagerInterface } from "./interface.sol";
+
+abstract contract Helpers is DSMath, Basic {
+    /**
+     * Polygon POS Bridge ERC20 Predicate
+     */
+    address internal constant erc20Predicate = 0x40ec5B33f54e0E8A33A975908C5BA1c14e5BbbDf;
+
+    /**
+     * Polygon POS Bridge Manager
+     */
+    RootChainManagerInterface internal constant migrator = RootChainManagerInterface(0xA0c68C638235ee32657e8f720a23ceC1bFc77C77);
+}

contracts/mainnet/connectors/polygon-bridge/interface.sol

@@ -0,0 +1,11 @@
+pragma solidity ^0.7.0;
+
+interface RootChainManagerInterface {
+    function depositEtherFor(address user) external payable;
+    function depositFor(
+        address user,
+        address rootToken,
+        bytes calldata depositData
+    ) external;
+    function exit(bytes calldata inputData) external;
+}

contracts/mainnet/connectors/polygon-bridge/main.sol

@@ -0,0 +1,46 @@
+pragma solidity ^0.7.0;
+
+import { TokenInterface } from "../../common/interfaces.sol";
+import { Stores } from "../../common/stores.sol";
+import { Helpers } from "./helpers.sol";
+import { Events } from "./events.sol";
+
+abstract contract PolygonBridgeResolver is Events, Helpers {
+    /**
+     * @dev Deposit assets to the bridge.
+     * @notice Deposit assets to the bridge.
+     * @param targetDsa The address to receive the token on Polygon
+     * @param token The address of the token to deposit. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+     * @param amt The amount of tokens to deposit. (For max: `uint256(-1)`)
+     * @param getId ID to retrieve amt.
+     * @param setId ID stores the amount of tokens deposit.
+    */
+    function deposit(
+        address targetDsa,
+        address token,
+        uint256 amt,
+        uint256 getId,
+        uint256 setId
+    ) external payable returns (string memory _eventName, bytes memory _eventParam) {
+        uint _amt = getUint(getId, amt);
+
+        if (token == ethAddr) {
+            _amt = _amt == uint(-1) ? address(this).balance : _amt;
+            migrator.depositEtherFor{value: _amt}(targetDsa);
+        } else {
+            TokenInterface _token = TokenInterface(token);
+            _amt = _amt == uint(-1) ? _token.balanceOf(address(this)) : _amt;
+            _token.approve(erc20Predicate, _amt);
+            migrator.depositFor(targetDsa, token, abi.encode(_amt));
+        }
+
+        setUint(setId, _amt);
+
+        _eventName = "LogDeposit(address,address,uint256,uint256,uint256)";
+        _eventParam = abi.encode(targetDsa, token, _amt, getId, setId);
+    }
+}
+
+contract ConnectPolygonBridge is PolygonBridgeResolver {
+    string public constant name = "COMP-v1";
+}