Aave v3 updates on Fantom

contracts/fantom/connectors/aave/v3/events.sol

@@ -32,4 +32,10 @@ contract Events {
 	event LogDisableCollateral(address[] tokens);
 	event LogSwapRateMode(address indexed token, uint256 rateMode);
 	event LogSetUserEMode(uint8 categoryId);
+	event LogApproveDelegation(
+		address token,
+		uint16 debtType,
+		address delegateTo,
+		uint256 amount
+	);
 }

contracts/fantom/connectors/aave/v3/helpers.sol

@@ -64,4 +64,21 @@ abstract contract Helpers is DSMath, Basic {
 			address(this)
 		);
 	}
+
+	/**
+	 * @dev Get debt token address for an asset
+	 * @param token token address of the asset
+	 * @param rateMode Debt type: stable-1, variable-2
+	 */
+	function getDTokenAddr(address token, uint16 rateMode)
+		internal
+		view
+		returns(address dToken)
+	{
+		if (rateMode == 1) {
+			(, dToken, ) = aaveData.getReserveTokensAddresses(token);
+		} else {
+			(, , dToken) = aaveData.getReserveTokensAddresses(token);
+		}
+	}
 }

contracts/fantom/connectors/aave/v3/interface.sol

@@ -90,3 +90,7 @@ interface AaveAddressProviderRegistryInterface {
 interface ATokenInterface {
 	function balanceOf(address _user) external view returns (uint256);
 }
+
+interface DTokenInterface {
+	function approveDelegation(address delegatee, uint256 amount) external;
+}

contracts/fantom/connectors/aave/v3/main.sol

@@ -10,7 +10,7 @@ import { TokenInterface } from "../../../common/interfaces.sol";
 import { Stores } from "../../../common/stores.sol";
 import { Helpers } from "./helpers.sol";
 import { Events } from "./events.sol";
-import { AaveInterface } from "./interface.sol";
+import { AaveInterface, DTokenInterface } from "./interface.sol";
 
 abstract contract AaveResolver is Events, Helpers {
 	/**
@@ -63,6 +63,56 @@ abstract contract AaveResolver is Events, Helpers {
 		_eventParam = abi.encode(token, _amt, getId, setId);
 	}
 
+	/**
+	 * @dev Deposit Ftm/ERC20_Token.
+	 * @notice Deposit a token to Aave v3 for lending / collaterization.
+	 * @param token The address of the token to deposit.(For FTM: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of the token to deposit. (For max: `uint256(-1)`)
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens deposited.
+	 */
+	function depositWithoutCollateral(
+		address token,
+		uint256 amt,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		uint256 _amt = getUint(getId, amt);
+
+		AaveInterface aave = AaveInterface(aaveProvider.getPool());
+
+		bool isFTM = token == ftmAddr;
+		address _token = isFTM ? wftmAddr : token;
+
+		TokenInterface tokenContract = TokenInterface(_token);
+
+		if (isFTM) {
+			_amt = _amt == uint256(-1) ? address(this).balance : _amt;
+			convertFtmToWftm(isFTM, tokenContract, _amt);
+		} else {
+			_amt = _amt == uint256(-1)
+				? tokenContract.balanceOf(address(this))
+				: _amt;
+		}
+
+		approve(tokenContract, address(aave), _amt);
+
+		aave.supply(_token, _amt, address(this), referralCode);
+
+		if (getCollateralBalance(_token) > 0 && getIsColl(token)) {
+			aave.setUserUseReserveAsCollateral(_token, false);
+		}
+
+		setUint(setId, _amt);
+
+		_eventName = "LogDeposit(address,uint256,uint256,uint256)";
+		_eventParam = abi.encode(token, _amt, getId, setId);
+	}
+
 	/**
 	 * @dev Withdraw ftm/ERC20_Token.
 	 * @notice Withdraw deposited token from Aave v3
@@ -139,6 +189,44 @@ abstract contract AaveResolver is Events, Helpers {
 		_eventParam = abi.encode(token, _amt, rateMode, getId, setId);
 	}
 
+	/**
+	 * @dev Borrow Ftm/ERC20_Token on behalf of a user.
+	 * @notice Borrow a token using Aave v3 on behalf of a user
+	 * @param token The address of the token to borrow.(For FTM: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
+	 * @param amt The amount of the token to borrow.
+	 * @param rateMode The type of borrow debt. (For Stable: 1, Variable: 2)
+	 * @param onBehalfOf The user who will incur the debt
+	 * @param getId ID to retrieve amt.
+	 * @param setId ID stores the amount of tokens borrowed.
+	 */
+	function borrowOnBehalfOf(
+		address token,
+		uint256 amt,
+		uint256 rateMode,
+		address onBehalfOf,
+		uint256 getId,
+		uint256 setId
+	)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		uint256 _amt = getUint(getId, amt);
+
+		AaveInterface aave = AaveInterface(aaveProvider.getPool());
+
+		bool isFTM = token == ftmAddr;
+		address _token = isFTM ? wftmAddr : token;
+
+		aave.borrow(_token, _amt, rateMode, referralCode, onBehalfOf);
+		convertFtmToWftm(isFTM, TokenInterface(_token), _amt);
+
+		setUint(setId, _amt);
+
+		_eventName = "LogBorrow(address,uint256,uint256,uint256,uint256)";
+		_eventParam = abi.encode(token, _amt, rateMode, getId, setId);
+	}
+
 	/**
 	 * @dev Payback borrowed ftm/ERC20_Token.
 	 * @notice Payback debt owed.
@@ -316,6 +404,32 @@ abstract contract AaveResolver is Events, Helpers {
 		_eventName = "LogSetUserEMode(uint8)";
 		_eventParam = abi.encode(categoryId);
 	}
+
+	/**
+	 * @dev Approve Delegation
+	 * @notice Gives approval to delegate debt tokens
+	 * @param token The address of token
+	 * @param rateMode The type of borrow debt
+	 * @param delegateTo The address to whom the user is delegating
+	 * @param amount The amount 
+	 */
+	function approveDelegation(address token, uint16 rateMode, address delegateTo, uint256 amount)
+		external
+		payable
+		returns (string memory _eventName, bytes memory _eventParam)
+	{
+		require(rateMode == 1 || rateMode == 2, "Invalid debt type");
+
+		bool isFTM = token == ftmAddr;
+		address _token = isFTM ? wftmAddr : token;
+
+		address _dToken = getDTokenAddr(_token, rateMode);
+		DTokenInterface(_dToken).approveDelegation(delegateTo, amount);
+
+		_eventName = "LogApproveDelegation(address,uint16,address,uint256)";
+		_eventParam = abi.encode(token, rateMode, delegateTo, amount);
+
+	}
 }
 
 contract ConnectV2AaveV3Fantom is AaveResolver {