Handling ERC4626 vaults in AcreRouter

core/contracts/AcreRouter.sol

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-3.0-only
+pragma solidity ^0.8.21;
+
+import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+
+/// @title AcreRouter
+/// @notice AcreRouter is a contract that routes TBTC from stBTC (Acre) to
+///         a given vault and back. Vaults supply yield strategies with TBTC that
+///         generate yield for Bitcoin holders.
+contract AcreRouter is OwnableUpgradeable {
+    struct Vault {
+        bool approved;
+    }
+
+    /// @notice Approved vaults within the Yiern Modules that implement ERC4626
+    ///         standard. These vaults deposit assets to yield strategies, e.g.
+    ///         Uniswap V3 WBTC/TBTC pool. Vault can be a part of Acre ecosystem
+    ///         or can be implemented externally. As long as it complies with
+    ///         ERC4626 standard and is approved by the owner it can be
+    ///         plugged into Acre.
+    address[] public vaults;
+    mapping(address => Vault) public vaultsInfo;
+
+    event VaultAdded(address indexed vault);
+    event VaultRemoved(address indexed vault);
+
+    /// @notice Adds a vault to the list of approved vaults.
+    /// @param vault Address of the vault to add.
+    function addVault(address vault) external onlyOwner {
+        require(!vaultsInfo[vault].approved, "Vault already approved");
+
+        vaults.push(vault);
+        vaultsInfo[vault].approved = true;
+
+        emit VaultAdded(vault);
+    }
+
+    /// @notice Removes a vault from the list of approved vaults.
+    /// @param vault Address of the vault to remove.
+    function removeVault(address vault) external onlyOwner {
+        require(vaultsInfo[vault].approved, "Not a vault");
+
+        delete vaultsInfo[vault];
+
+        for (uint256 i = 0; i < vaults.length; i++) {
+            if (vaults[i] == vault) {
+                vaults[i] = vaults[vaults.length - 1];
+                vaults.pop();
+                break;
+            }
+        }
+
+        emit VaultRemoved(vault);
+    }
+}

core/package.json

@@ -55,5 +55,8 @@
     "ts-node": "^10.9.1",
     "typechain": "^8.3.2",
     "typescript": "^5.3.2"
+  },
+  "dependencies": {
+    "@openzeppelin/contracts-upgradeable": "^5.0.0"
   }
 }