Merge pull request #6 from Instadapp/proxy-contracts

Proxy contracts

contracts/proxy/proxyAdmin.sol

@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "@openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol";
+
+interface IndexInterface {
+    function master() external view returns (address);
+}
+
+/**
+ * @dev This is an auxiliary contract meant to be assigned as the admin of a {TransparentUpgradeableProxy}. For an
+ * explanation of why you would want to use this see the documentation for {TransparentUpgradeableProxy}.
+ */
+contract InstaMasterProxy {
+
+    IndexInterface immutable public instaIndex;
+
+    constructor(address _instaIndex) {
+        instaIndex = IndexInterface(_instaIndex);
+    }
+
+    modifier isMaster() {
+        require(msg.sender == instaIndex.master(), "Implementations: not-master");
+        _;
+    }
+
+    /**
+     * @dev Returns the current implementation of `proxy`.
+     *
+     * Requirements:
+     *
+     * - This contract must be the admin of `proxy`.
+     */
+    function getProxyImplementation(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
+        // We need to manually run the static call since the getter cannot be flagged as view
+        // bytes4(keccak256("implementation()")) == 0x5c60da1b
+        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"5c60da1b");
+        require(success);
+        return abi.decode(returndata, (address));
+    }
+
+    /**
+     * @dev Returns the current admin of `proxy`.
+     *
+     * Requirements:
+     *
+     * - This contract must be the admin of `proxy`.
+     */
+    function getProxyAdmin(TransparentUpgradeableProxy proxy) public view virtual returns (address) {
+        // We need to manually run the static call since the getter cannot be flagged as view
+        // bytes4(keccak256("admin()")) == 0xf851a440
+        (bool success, bytes memory returndata) = address(proxy).staticcall(hex"f851a440");
+        require(success);
+        return abi.decode(returndata, (address));
+    }
+
+    /**
+     * @dev Changes the admin of `proxy` to `newAdmin`.
+     *
+     * Requirements:
+     *
+     * - This contract must be the current admin of `proxy`.
+     */
+    function changeProxyAdmin(TransparentUpgradeableProxy proxy, address newAdmin) public virtual isMaster {
+        proxy.changeAdmin(newAdmin);
+    }
+
+    /**
+     * @dev Upgrades `proxy` to `implementation`. See {TransparentUpgradeableProxy-upgradeTo}.
+     *
+     * Requirements:
+     *
+     * - This contract must be the admin of `proxy`.
+     */
+    function upgrade(TransparentUpgradeableProxy proxy, address implementation) public virtual isMaster {
+        proxy.upgradeTo(implementation);
+    }
+
+    /**
+     * @dev Upgrades `proxy` to `implementation` and calls a function on the new implementation. See
+     * {TransparentUpgradeableProxy-upgradeToAndCall}.
+     *
+     * Requirements:
+     *
+     * - This contract must be the admin of `proxy`.
+     */
+    function upgradeAndCall(TransparentUpgradeableProxy proxy, address implementation, bytes memory data) public payable virtual isMaster {
+        proxy.upgradeToAndCall{value: msg.value}(implementation, data);
+    }
+}

contracts/proxy/receivers.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "@openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol";
+
+contract InstaAaveV2MigratorReceiver is TransparentUpgradeableProxy {
+    constructor(address _logic, address admin_, bytes memory _data) public TransparentUpgradeableProxy(_logic, admin_, _data) {}
+}

contracts/proxy/senders.sol

@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.7.0;
+
+import "@openzeppelin/contracts/proxy/TransparentUpgradeableProxy.sol";
+
+contract InstaAaveV2MigratorSender is TransparentUpgradeableProxy {
+    constructor(address _logic, address admin_, bytes memory _data) public TransparentUpgradeableProxy(_logic, admin_, _data) {}
+}