From 76bc1f58ac84f6060e1a876703cedc58ff789ab5 Mon Sep 17 00:00:00 2001
From: domenicodev <domenico.romeo3919@gmail.com>
Date: Tue, 27 Feb 2024 11:40:56 +0100
Subject: [PATCH] feat: Initial Setup

---
 evm/src/etherfi/EtherfiAdapter.sol | 122 +++++++++++++++++++++++++++++
 evm/src/etherfi/manifest.yaml      |  36 +++++++++
 2 files changed, 158 insertions(+)
 create mode 100644 evm/src/etherfi/EtherfiAdapter.sol
 create mode 100644 evm/src/etherfi/manifest.yaml

diff --git a/evm/src/etherfi/EtherfiAdapter.sol b/evm/src/etherfi/EtherfiAdapter.sol
new file mode 100644
index 0000000..d2c6c4f
--- /dev/null
+++ b/evm/src/etherfi/EtherfiAdapter.sol
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+pragma experimental ABIEncoderV2;
+pragma solidity ^0.8.13;
+
+import {IERC20, ISwapAdapter} from "src/interfaces/ISwapAdapter.sol";
+
+/// @title Etherfi Adapter
+/// @dev This contract supports the following swaps: eETH<->ETH, wETH<->eETH, wETH<->ETH
+contract EtherfiAdapter is ISwapAdapter {
+
+    IWeEth wEeth;
+    IeEth eEth;
+    ILiquidityPool liquidityPool;
+
+    constructor(address _wEeth) {
+        wEeth = IWeEth(_wEeth);
+        eEth = wEeth.eETH();
+        liquidityPool = eEth.liquidityPool();
+    }
+
+    /// @dev Check if tokens in input are supported by this adapter
+    modifier checkInputTokens(address sellToken, address buyToken) {
+        if(sellToken == buyToken) {
+            revert Unavailable("This pool only supports eETH, weEth and ETH");
+        }
+        if(sellToken != address(wEeth) && sellToken != address(eEth) && sellToken && sellToken != address(0)) {
+            revert Unavailable("This pool only supports eETH, weEth and ETH");
+        }
+        if(buyToken != address(wEeth) && buyToken != address(eEth) && buyToken != address(0)) {
+            revert Unavailable("This pool only supports eETH, weEth and ETH");
+        }
+        _;
+    }
+
+    function price(
+        bytes32 _poolId,
+        IERC20 _sellToken,
+        IERC20 _buyToken,
+        uint256[] memory _specifiedAmounts
+    ) external view override returns (Fraction[] memory _prices) {
+        revert NotImplemented("TemplateSwapAdapter.price");
+    }
+
+    function swap(
+        bytes32 poolId,
+        IERC20 sellToken,
+        IERC20 buyToken,
+        OrderSide side,
+        uint256 specifiedAmount
+    ) external returns (Trade memory trade) {
+        revert NotImplemented("TemplateSwapAdapter.swap");
+    }
+
+    function getLimits(bytes32 poolId, IERC20 sellToken, IERC20 buyToken)
+        external
+        returns (uint256[] memory limits)
+    {
+        revert NotImplemented("TemplateSwapAdapter.getLimits");
+    }
+
+    function getCapabilities(bytes32 poolId, IERC20 sellToken, IERC20 buyToken)
+        external
+        returns (Capability[] memory capabilities)
+    {
+        revert NotImplemented("TemplateSwapAdapter.getCapabilities");
+    }
+
+    function getTokens(bytes32 poolId)
+        external
+        returns (IERC20[] memory tokens)
+    {
+        revert NotImplemented("TemplateSwapAdapter.getTokens");
+    }
+
+    function getPoolIds(uint256 offset, uint256 limit)
+        external
+        returns (bytes32[] memory ids)
+    {
+        revert NotImplemented("TemplateSwapAdapter.getPoolIds");
+    }
+}
+
+interface ILiquidityPool {
+
+    function numPendingDeposits() external view returns (uint32);
+    function totalValueOutOfLp() external view returns (uint128);
+    function totalValueInLp() external view returns (uint128);
+    function getTotalEtherClaimOf(address _user) external view returns (uint256);
+    function getTotalPooledEther() external view returns (uint256);
+    function sharesForAmount(uint256 _amount) external view returns (uint256);
+    function sharesForWithdrawalAmount(uint256 _amount) external view returns (uint256);
+    function amountForShare(uint256 _share) external view returns (uint256);
+
+    function deposit() external payable returns (uint256);
+    function deposit(address _referral) external payable returns (uint256);
+    function deposit(address _user, address _referral) external payable returns (uint256);
+
+}
+
+interface IeEth {
+
+    function liquidityPool() external view returns (ILiquidityPool);
+
+    function totalShares() external view returns (uint256);
+
+    function shares(address _user) external view returns (uint256);
+
+}
+
+interface IWeEth {
+
+    function eETH() external view returns (IeEth);
+
+    function getWeETHByeETH(uint256 _eETHAmount) external view returns (uint256);
+
+    function getEETHByWeETH(uint256 _weETHAmount) external view returns (uint256);
+
+    function wrap(uint256 _eETHAmount) external returns (uint256);
+
+    function unwrap(uint256 _weETHAmount) external returns (uint256);
+
+}
diff --git a/evm/src/etherfi/manifest.yaml b/evm/src/etherfi/manifest.yaml
new file mode 100644
index 0000000..c6cb262
--- /dev/null
+++ b/evm/src/etherfi/manifest.yaml
@@ -0,0 +1,36 @@
+# information about the author helps us reach out in case of issues.
+author:
+  name: Propellerheads.xyz
+  email: alan@propellerheads.xyz
+
+# Protocol Constants
+constants:
+  protocol_gas: 30000
+  # minimum capabilities we can expect, individual pools may extend these
+  capabilities:
+    - SellSide
+    - BuySide
+    - PriceFunction
+
+# The file containing the adapter contract
+contract: EtherfiAdapter.sol
+
+# Deployment instances used to generate chain specific bytecode.
+instances:
+  - chain:
+      name: mainnet
+      id: 0
+    arguments:
+      - "0xCd5fE23C85820F7B72D0926FC9b05b43E359b7ee"
+
+# Specify some automatic test cases in case getPoolIds and
+# getTokens are not implemented.
+tests:
+  instances:
+    - pool_id: "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc"
+      sell_token: "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
+      buy_token: "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"
+      block: 17000000
+      chain:
+        id: 0
+        name: mainnet