Add owner

src/Blue.sol

@@ -7,6 +7,8 @@ import {IOracle} from "src/interfaces/IOracle.sol";
 import {MathLib} from "src/libraries/MathLib.sol";
 import {SafeTransferLib} from "src/libraries/SafeTransferLib.sol";
 
+import {Owned} from "src/dependencies/Owned.sol";
+
 uint constant WAD = 1e18;
 
 uint constant alpha = 0.5e18;
@@ -29,7 +31,7 @@ function irm(uint utilization) pure returns (uint) {
     return utilization / 365 days;
 }
 
-contract Blue {
+contract Blue is Owned {
     using MathLib for uint;
     using SafeTransferLib for IERC20;
 
@@ -52,6 +54,8 @@ contract Blue {
     // Interests last update (used to check if a market has been created).
     mapping(Id => uint) public lastUpdate;
 
+    constructor(address owner) Owned(owner) {}
+
     // Markets management.
 
     function createMarket(Market calldata market) external {

src/dependencies/Owned.sol

@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity >=0.8.0;
+
+/// @notice Simple single owner authorization mixin.
+/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/auth/Owned.sol)
+abstract contract Owned {
+    /*//////////////////////////////////////////////////////////////
+                                 EVENTS
+    //////////////////////////////////////////////////////////////*/
+
+    event OwnershipTransferred(address indexed user, address indexed newOwner);
+
+    /*//////////////////////////////////////////////////////////////
+                            OWNERSHIP STORAGE
+    //////////////////////////////////////////////////////////////*/
+
+    address public owner;
+
+    modifier onlyOwner() virtual {
+        require(msg.sender == owner, "UNAUTHORIZED");
+
+        _;
+    }
+
+    /*//////////////////////////////////////////////////////////////
+                               CONSTRUCTOR
+    //////////////////////////////////////////////////////////////*/
+
+    constructor(address _owner) {
+        owner = _owner;
+
+        emit OwnershipTransferred(address(0), _owner);
+    }
+
+    /*//////////////////////////////////////////////////////////////
+                             OWNERSHIP LOGIC
+    //////////////////////////////////////////////////////////////*/
+
+    function transferOwnership(address newOwner) public virtual onlyOwner {
+        owner = newOwner;
+
+        emit OwnershipTransferred(msg.sender, newOwner);
+    }
+}