contracts/CRenameDelegate.sol: add CRenameDelegate

contracts/CRenameDelegate.sol

@@ -0,0 +1,53 @@
+pragma solidity ^0.5.16;
+
+import "./CTokenInterfaces.sol";
+
+/**
+ * @title Cream's CCollateralCapErc20Delegate Contract
+ * @notice CTokens which wrap an EIP-20 underlying and are delegated to
+ * @author Cream
+ */
+contract CRenameDelegate is CTokenStorage, CErc20Storage, CDelegateInterface {
+    /**
+     * @notice Construct an empty delegate
+     */
+    constructor() public {}
+
+    /**
+     * @notice Event emitted when the name is updated
+     */
+    event NewTokenName(string oldTokenName, string newTokenName);
+
+    /**
+     * @notice Event emitted when the symbol is updated
+     */
+    event NewTokenSymbol(string oldTokenSymbol, string newTokenSymbol);
+
+    /**
+     * @notice Called by the delegator on a delegate to initialize it for duty
+     * @param data The encoded bytes data for any initialization
+     */
+    function _becomeImplementation(bytes memory data) public {
+        require(msg.sender == admin, "admin only");
+
+        (string memory name_, string memory symbol_) = abi.decode(data, (string, string));
+
+        emit NewTokenName(name, name_);
+        emit NewTokenSymbol(symbol, symbol_);
+
+        name = name_;
+        symbol = symbol_;
+    }
+
+    /**
+     * @notice Called by the delegator on a delegate to forfeit its responsibility
+     */
+    function _resignImplementation() public {
+        // Shh -- we don't ever want this hook to be marked pure
+        if (false) {
+            implementation = address(0);
+        }
+
+        require(msg.sender == admin, "admin only");
+    }
+}