feat(security): further work on security monitor

packages/contracts/foundry.toml

@@ -43,3 +43,6 @@ src = 'src/dollar'
 [profile.intense.fuzz]
 runs = 100000
 max_test_rejects = 900000
+
+[lint]
+foundry-test-functions = false

packages/contracts/package.json

@@ -14,6 +14,7 @@
     "url": "https://github.com/ubiquity/ubiquity-dollar.git"
   },
   "dependencies": {
+    "@chainlink/contracts": "^1.2.0",
     "@types/command-line-args": "5.2.0",
     "command-line-args": "5.2.1",
     "dotenv": "^16.0.3",

packages/contracts/src/dollar/utils/SecurityMonitor.sol

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.19;
+
+import "@openzeppelin/contracts/access/AccessControl.sol";
+import "@openzeppelin/contracts/security/Pausable.sol";
+import "@chainlink/contracts/src/v0.8/AutomationCompatible.sol";
+
+contract SecurityMonitor is AccessControl, AutomationCompatibleInterface {
+    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");
+    uint256 public lastCheckBlock;
+    uint256 public liquidityThreshold; // Set this according to your needs
+
+    event SecurityIncident(string message);
+
+    constructor(address admin, uint256 _liquidityThreshold) {
+        _setupRole(DEFAULT_ADMIN_ROLE, admin);
+        _setupRole(PAUSER_ROLE, admin);
+        liquidityThreshold = _liquidityThreshold;
+        lastCheckBlock = block.number;
+    }
+
+    // This function should contain the logic to check liquidity levels
+    function checkLiquidity() internal view returns (bool) {
+        // Implement your liquidity checking logic here
+        // Return true if liquidity is below the threshold
+        return false; // Example placeholder
+    }
+
+    function checkUpkeep(
+        bytes calldata
+    ) external view override returns (bool upkeepNeeded, bytes memory) {
+        upkeepNeeded = checkLiquidity();
+    }
+
+    function performUpkeep(bytes calldata) external override {
+        if (checkLiquidity()) {
+            pauseAllContracts();
+            notifyTeam(
+                "Security incident detected: Liquidity threshold breached. Contracts paused."
+            );
+        }
+        lastCheckBlock = block.number;
+    }
+
+    function pauseAllContracts() public onlyRole(PAUSER_ROLE) {
+        // Implement logic to pause all relevant contracts
+        emit SecurityIncident(
+            "All contracts paused due to a security incident."
+        );
+    }
+
+    function notifyTeam(string memory message) public onlyRole(PAUSER_ROLE) {
+        // Implement logic to notify the team
+        emit SecurityIncident(message);
+    }
+
+    function supportsInterface(
+        bytes4 interfaceId
+    ) public view virtual override returns (bool) {
+        return super.supportsInterface(interfaceId);
+    }
+}