Added deadline, implemented deposit and repay withPermit functions

contracts/interfaces/ILendingPool.sol

@@ -263,6 +263,7 @@ interface ILendingPool {
     uint256 amount,
     address onBehalfOf,
     uint16 referralCode,
+    uint256 deadline,
     uint8 permitV,
     bytes32 permitR,
     bytes32 permitS
@@ -288,6 +289,7 @@ interface ILendingPool {
     uint256 amount,
     uint256 rateMode,
     address onBehalfOf,
+    uint256 deadline,
     uint8 permitV,
     bytes32 permitR,
     bytes32 permitS

contracts/protocol/lendingpool/LendingPool.sol

@@ -4,6 +4,7 @@ pragma experimental ABIEncoderV2;
 
 import {SafeMath} from '../../dependencies/openzeppelin/contracts/SafeMath.sol';
 import {IERC20} from '../../dependencies/openzeppelin/contracts/IERC20.sol';
+import {IERC20WithPermit} from '../../interfaces/IERC20WithPermit.sol';
 import {SafeERC20} from '../../dependencies/openzeppelin/contracts/SafeERC20.sol';
 import {Address} from '../../dependencies/openzeppelin/contracts/Address.sol';
 import {ILendingPoolAddressesProvider} from '../../interfaces/ILendingPoolAddressesProvider.sol';
@@ -107,25 +108,7 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
     address onBehalfOf,
     uint16 referralCode
   ) external override whenNotPaused {
-    DataTypes.ReserveData storage reserve = _reserves[asset];
+    _executeDeposit(asset, amount, onBehalfOf, referralCode);
-
-    ValidationLogic.validateDeposit(reserve, amount);
-
-    address aToken = reserve.aTokenAddress;
-
-    reserve.updateState();
-    reserve.updateInterestRates(asset, aToken, amount, 0);
-
-    IERC20(asset).safeTransferFrom(msg.sender, aToken, amount);
-
-    bool isFirstDeposit = IAToken(aToken).mint(onBehalfOf, amount, reserve.liquidityIndex);
-
-    if (isFirstDeposit) {
-      _usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
-      emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
-    }
-
-    emit Deposit(asset, msg.sender, onBehalfOf, amount, referralCode);
   }
 
   /**
@@ -254,6 +237,63 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
     emit Swap(asset, msg.sender, rateMode);
   }
 
+  /**
+   * @notice Deposit with transfer approval of asset to be deposited done via permit function
+   * see: https://eips.ethereum.org/EIPS/eip-2612 and https://eips.ethereum.org/EIPS/eip-713
+   * @param asset The address of the underlying asset to deposit
+   * @param amount The amount to be deposited
+   * @param onBehalfOf The address that will receive the aTokens, same as msg.sender if the user
+   *   wants to receive them on his own wallet, or a different address if the beneficiary of aTokens
+   *   is a different wallet
+   * @param referralCode Code used to register the integrator originating the operation, for potential rewards.
+   *   0 if the action is executed directly by the user, without any middle-man
+   * @param permitV V parameter of ERC712 permit sig
+   * @param permitR R parameter of ERC712 permit sig
+   * @param permitS S parameter of ERC712 permit sig
+   **/
+  function depositWithPermit(
+    address asset,
+    uint256 amount,
+    address onBehalfOf,
+    uint16 referralCode,
+    uint256 deadline,
+    uint8 permitV,
+    bytes32 permitR,
+    bytes32 permitS
+  ) external override {
+    IERC20WithPermit(asset).permit(msg.sender, address(this), amount, deadline, permitV, permitR, permitS);
+    _executeDeposit(asset, amount, onBehalfOf, referralCode);
+  }
+
+  /**
+   * @notice Repay with transfer approval of asset to be repaid done via permit function
+   * see: https://eips.ethereum.org/EIPS/eip-2612 and https://eips.ethereum.org/EIPS/eip-713
+   * @param asset The address of the borrowed underlying asset previously borrowed
+   * @param amount The amount to repay
+   * - Send the value type(uint256).max in order to repay the whole debt for `asset` on the specific `debtMode`
+   * @param rateMode The interest rate mode at of the debt the user wants to repay: 1 for Stable, 2 for Variable
+   * @param onBehalfOf Address of the user who will get his debt reduced/removed. Should be the address of the
+   * user calling the function if he wants to reduce/remove his own debt, or the address of any other
+   * other borrower whose debt should be removed
+   * @param permitV V parameter of ERC712 permit sig
+   * @param permitR R parameter of ERC712 permit sig
+   * @param permitS S parameter of ERC712 permit sig
+   * @return The final amount repaid
+   **/
+  function repayWithPermit(
+    address asset,
+    uint256 amount,
+    uint256 rateMode,
+    address onBehalfOf,
+    uint256 deadline,
+    uint8 permitV,
+    bytes32 permitR,
+    bytes32 permitS
+  ) external override returns (uint256) {
+    IERC20WithPermit(asset).permit(msg.sender, address(this), amount, deadline, permitV, permitR, permitS);
+    return _executeRepay(asset, amount, rateMode, onBehalfOf);
+  }
+
   /**
    * @dev Rebalances the stable interest rate of a user to the current stable rate defined on the reserve.
    * - Users can be rebalanced if the following conditions are satisfied:
@@ -845,6 +885,33 @@ contract LendingPool is VersionedInitializable, ILendingPool, LendingPoolStorage
     );
   }
 
+  function _executeDeposit(
+    address asset,
+    uint256 amount,
+    address onBehalfOf,
+    uint16 referralCode
+  ) internal {
+    DataTypes.ReserveData storage reserve = _reserves[asset];
+
+    ValidationLogic.validateDeposit(reserve, amount);
+
+    address aToken = reserve.aTokenAddress;
+
+    reserve.updateState();
+    reserve.updateInterestRates(asset, aToken, amount, 0);
+
+    IERC20(asset).safeTransferFrom(msg.sender, aToken, amount);
+
+    bool isFirstDeposit = IAToken(aToken).mint(onBehalfOf, amount, reserve.liquidityIndex);
+
+    if (isFirstDeposit) {
+      _usersConfig[onBehalfOf].setUsingAsCollateral(reserve.id, true);
+      emit ReserveUsedAsCollateralEnabled(asset, onBehalfOf);
+    }
+
+    emit Deposit(asset, msg.sender, onBehalfOf, amount, referralCode);
+  }
+
   function _executeWithdraw(
     address asset,
     uint256 amount,