From 189835762e908a646f88ef74e176b875c32943da Mon Sep 17 00:00:00 2001
From: Lucas Manuel <lucas@maple.finance>
Date: Fri, 26 Nov 2021 09:07:29 -0500
Subject: [PATCH] chore: Remove erc20 dependency (SC-4209) (#6)

* chore: use IERC20Like instead of IERC20

* dapp uninstall erc20
---
 .gitmodules                   |  3 ---
 lib/erc20                     |  1 -
 src/ERC20Helper.sol           |  8 ++++----
 src/interfaces/IERC20Like.sol | 13 +++++++++++++
 4 files changed, 17 insertions(+), 8 deletions(-)
 delete mode 160000 lib/erc20
 create mode 100644 src/interfaces/IERC20Like.sol

diff --git a/.gitmodules b/.gitmodules
index a5d3e70..2e9401e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
-[submodule "lib/erc20"]
-	path = lib/erc20
-	url = https://github.com/maple-labs/erc20.git
 [submodule "lib/ds-test"]
 	path = lib/ds-test
 	url = https://github.com/dapphub/ds-test.git
diff --git a/lib/erc20 b/lib/erc20
deleted file mode 160000
index de7fc2c..0000000
--- a/lib/erc20
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit de7fc2cda0f847c4e8fa087bdc5dc04018bdb49a
diff --git a/src/ERC20Helper.sol b/src/ERC20Helper.sol
index f0edff5..e23d134 100644
--- a/src/ERC20Helper.sol
+++ b/src/ERC20Helper.sol
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 pragma solidity ^0.8.7;
 
-import { IERC20 } from "../lib/erc20/src/interfaces/IERC20.sol";
+import { IERC20Like } from "./interfaces/IERC20Like.sol";
 
 /**
  * @title Small Library to standardize erc20 token interactions. 
@@ -15,15 +15,15 @@ library ERC20Helper {
     /**************************/
 
     function transfer(address token, address to, uint256 amount) internal returns (bool) {
-        return _call(token, abi.encodeWithSelector(IERC20.transfer.selector, to, amount));
+        return _call(token, abi.encodeWithSelector(IERC20Like.transfer.selector, to, amount));
     }
 
     function transferFrom(address token, address from, address to, uint256 amount) internal returns (bool) {
-        return _call(token, abi.encodeWithSelector(IERC20.transferFrom.selector, from, to, amount));
+        return _call(token, abi.encodeWithSelector(IERC20Like.transferFrom.selector, from, to, amount));
     }
 
     function approve(address token, address spender, uint256 amount) internal returns (bool) {
-        return _call(token, abi.encodeWithSelector(IERC20.approve.selector, spender, amount));
+        return _call(token, abi.encodeWithSelector(IERC20Like.approve.selector, spender, amount));
     }
 
     function _call(address token, bytes memory data) private returns (bool success) {
diff --git a/src/interfaces/IERC20Like.sol b/src/interfaces/IERC20Like.sol
new file mode 100644
index 0000000..b66a4be
--- /dev/null
+++ b/src/interfaces/IERC20Like.sol
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity ^0.8.7;
+
+/// @title Interface of the ERC20 standard as needed by ERC20Helper
+interface IERC20Like {
+
+    function approve(address spender, uint256 amount) external returns (bool);
+
+    function transfer(address recipient, uint256 amount) external returns (bool);
+
+    function transferFrom(address owner, address recipient, uint256 amount) external returns (bool);
+
+}