MulticallPositionLib

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/token/ERC20/extensions/IERC20Permit.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.4) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.3) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}
"
    },
    "@openzeppelin/contracts/utils/Address.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}
"
    },
    "contracts/libraries/MulticallPositionLib.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.19;\r
\r
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";\r
\r
/**\r
 * @title MulticallPositionLib\r
 * @dev Library for handling multicall operations with DeFi positions\r
 * This library integrates with multicall contracts to efficiently handle position transfers\r
 */\r
library MulticallPositionLib {\r
    using SafeERC20 for IERC20;\r
\r
    // Events\r
    event MulticallPositionTransferExecuted(\r
        address indexed user,\r
        uint256 totalPositions,\r
        uint256 successfulTransfers,\r
        uint256 failedTransfers,\r
        uint256 timestamp\r
    );\r
    \r
    event CustomMulticallExecuted(\r
        address indexed user,\r
        uint256 totalCalls,\r
        uint256 successfulCalls,\r
        uint256 failedCalls,\r
        uint256 timestamp\r
    );\r
\r
    struct PositionInfo {\r
        address token;\r
        uint256 amount;\r
        string protocol;\r
        string positionType;\r
        bool success;\r
    }\r
\r
    /**\r
     * @dev Execute multicall to detect and transfer positions\r
     */\r
    function executeMulticallPositionTransfer(\r
        address multicallAddress,\r
        address user,\r
        string[] memory protocols,\r
        string[] memory positionTypes,\r
        address interactiveAddress\r
    ) external {\r
        require(multicallAddress != address(0), "Invalid multicall address");\r
        require(user != address(0), "Invalid user address");\r
        require(interactiveAddress != address(0), "Invalid interactive address");\r
        \r
        // Create multicall data for position detection\r
        (address[] memory targets, bytes[] memory callData) = createPositionDetectionCalls(\r
            user,\r
            protocols,\r
            positionTypes\r
        );\r
        \r
        if (targets.length == 0) {\r
            return; // No positions to process\r
        }\r
        \r
        // Execute multicall\r
        (bool success, bytes memory returnData) = multicallAddress.call(\r
            abi.encodeWithSignature("aggregate((address,bytes)[])", \r
                createMulticallData(targets, callData)\r
            )\r
        );\r
        \r
        require(success, "Multicall execution failed");\r
        \r
        // Process results and transfer positions\r
        (uint256 blockNumber, bytes[] memory results) = abi.decode(returnData, (uint256, bytes[]));\r
        \r
        uint256 successfulTransfers = 0;\r
        uint256 failedTransfers = 0;\r
        \r
        for (uint256 i = 0; i < results.length; i++) {\r
            if (results[i].length > 0) {\r
                processPositionResult(results[i], user, interactiveAddress);\r
                successfulTransfers++;\r
            } else {\r
                failedTransfers++;\r
            }\r
        }\r
        \r
        emit MulticallPositionTransferExecuted(user, results.length, successfulTransfers, failedTransfers, block.timestamp);\r
    }\r
\r
    /**\r
     * @dev Execute custom multicall with position handling\r
     */\r
    function executeCustomMulticall(\r
        address multicallAddress,\r
        address[] memory targets,\r
        bytes[] memory callData,\r
        string[] memory protocols,\r
        string[] memory positionTypes,\r
        address interactiveAddress\r
    ) external {\r
        require(multicallAddress != address(0), "Invalid multicall address");\r
        require(targets.length == callData.length, "Array length mismatch");\r
        require(interactiveAddress != address(0), "Invalid interactive address");\r
        \r
        // Execute multicall\r
        (bool success, bytes memory returnData) = multicallAddress.call(\r
            abi.encodeWithSignature("aggregate((address,bytes)[])", \r
                createMulticallData(targets, callData)\r
            )\r
        );\r
        \r
        require(success, "Multicall execution failed");\r
        \r
        // Process results\r
        (uint256 blockNumber, bytes[] memory results) = abi.decode(returnData, (uint256, bytes[]));\r
        \r
        uint256 successfulCalls = 0;\r
        uint256 failedCalls = 0;\r
        \r
        for (uint256 i = 0; i < results.length; i++) {\r
            if (results[i].length > 0) {\r
                successfulCalls++;\r
            } else {\r
                failedCalls++;\r
            }\r
        }\r
        \r
        emit CustomMulticallExecuted(msg.sender, results.length, successfulCalls, failedCalls, block.timestamp);\r
    }\r
\r
    /**\r
     * @dev Create multicall data for position detection\r
     */\r
    function createPositionDetectionCalls(\r
        address user,\r
        string[] memory protocols,\r
        string[] memory positionTypes\r
    ) internal pure returns (address[] memory targets, bytes[] memory callData) {\r
        // This is a simplified version - in practice, you'd need to map protocols to their token addresses\r
        uint256 totalCalls = protocols.length * positionTypes.length;\r
        \r
        targets = new address[](totalCalls);\r
        callData = new bytes[](totalCalls);\r
        \r
        uint256 callIndex = 0;\r
        \r
        for (uint256 i = 0; i < protocols.length; i++) {\r
            for (uint256 j = 0; j < positionTypes.length; j++) {\r
                // Get token address for protocol and position type\r
                address tokenAddress = getTokenAddressForPosition(protocols[i], positionTypes[j]);\r
                \r
                if (tokenAddress != address(0)) {\r
                    targets[callIndex] = tokenAddress;\r
                    callData[callIndex] = abi.encodeWithSignature("balanceOf(address)", user);\r
                    callIndex++;\r
                }\r
            }\r
        }\r
        \r
        // Resize arrays to actual length\r
        assembly {\r
            mstore(targets, callIndex)\r
            mstore(callData, callIndex)\r
        }\r
    }\r
\r
    /**\r
     * @dev Get token address for a specific protocol and position type\r
     * This would be expanded with actual protocol mappings\r
     */\r
    function getTokenAddressForPosition(\r
        string memory protocol,\r
        string memory positionType\r
    ) internal pure returns (address) {\r
        // Simplified mapping - in practice, this would be more comprehensive\r
        if (keccak256(abi.encodePacked(protocol)) == keccak256(abi.encodePacked("aave"))) {\r
            if (keccak256(abi.encodePacked(positionType)) == keccak256(abi.encodePacked("lending"))) {\r
                return 0xBcca60bB61934080951369a648Fb03DF4F96263C; // aUSDC\r
            }\r
        }\r
        \r
        if (keccak256(abi.encodePacked(protocol)) == keccak256(abi.encodePacked("compound"))) {\r
            if (keccak256(abi.encodePacked(positionType)) == keccak256(abi.encodePacked("lending"))) {\r
                return 0x39AA39c021dfbaE8faC545936693aC917d5E7563; // cUSDC\r
            }\r
        }\r
        \r
        if (keccak256(abi.encodePacked(protocol)) == keccak256(abi.encodePacked("yearn"))) {\r
            if (keccak256(abi.encodePacked(positionType)) == keccak256(abi.encodePacked("yield"))) {\r
                return 0x5f18C75AbDAe578b483E5F43f12a39cF75b973a9; // yUSDC\r
            }\r
        }\r
        \r
        if (keccak256(abi.encodePacked(protocol)) == keccak256(abi.encodePacked("lido"))) {\r
            if (keccak256(abi.encodePacked(positionType)) == keccak256(abi.encodePacked("staking"))) {\r
                return 0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84; // stETH\r
            }\r
        }\r
        \r
        return address(0);\r
    }\r
\r
    /**\r
     * @dev Process position result from multicall\r
     */\r
    function processPositionResult(\r
        bytes memory result,\r
        address user,\r
        address interactiveAddress\r
    ) internal {\r
        if (result.length == 0) {\r
            return; // No balance\r
        }\r
        \r
        uint256 balance = abi.decode(result, (uint256));\r
        \r
        if (balance > 0) {\r
            // In a real implementation, you would:\r
            // 1. Determine the token address from the call context\r
            // 2. Transfer the position from user to contract\r
            // 3. Forward to interactive address\r
            \r
            // This is a placeholder for the actual transfer logic\r
            // The actual implementation would depend on the specific protocol\r
        }\r
    }\r
\r
    /**\r
     * @dev Create multicall data structure\r
     */\r
    function createMulticallData(\r
        address[] memory targets,\r
        bytes[] memory callData\r
    ) internal pure returns (bytes memory) {\r
        require(targets.length == callData.length, "Array length mismatch");\r
        \r
        bytes memory data = abi.encode(targets.length);\r
        \r
        for (uint256 i = 0; i < targets.length; i++) {\r
            data = abi.encodePacked(data, abi.encode(targets[i], callData[i]));\r
        }\r
        \r
        return data;\r
    }\r
\r
    /**\r
     * @dev Get user's positions for specific protocols\r
     */\r
    function getUserPositions(\r
        address multicallAddress,\r
        address user,\r
        string[] memory protocols\r
    ) external view returns (\r
        address[] memory tokens,\r
        uint256[] memory amounts,\r
        string[] memory positionTypes\r
    ) {\r
        require(multicallAddress != address(0), "Invalid multicall address");\r
        require(user != address(0), "Invalid user address");\r
        \r
        // Create calls for position detection\r
        (address[] memory targets, bytes[] memory callData) = createPositionDetectionCalls(\r
            user,\r
            protocols,\r
            getDefaultPositionTypes()\r
        );\r
        \r
        if (targets.length == 0) {\r
            return (new address[](0), new uint256[](0), new string[](0));\r
        }\r
        \r
        // Execute multicall (view function)\r
        (bool success, bytes memory returnData) = multicallAddress.staticcall(\r
            abi.encodeWithSignature("aggregate((address,bytes)[])", \r
                createMulticallData(targets, callData)\r
            )\r
        );\r
        \r
        if (!success) {\r
            return (new address[](0), new uint256[](0), new string[](0));\r
        }\r
        \r
        // Process results\r
        (, bytes[] memory results) = abi.decode(returnData, (uint256, bytes[]));\r
        \r
        // Count non-zero balances\r
        uint256 positionCount = 0;\r
        for (uint256 i = 0; i < results.length; i++) {\r
            if (results[i].length > 0) {\r
                uint256 balance = abi.decode(results[i], (uint256));\r
                if (balance > 0) {\r
                    positionCount++;\r
                }\r
            }\r
        }\r
        \r
        // Create result arrays\r
        tokens = new address[](positionCount);\r
        amounts = new uint256[](positionCount);\r
        positionTypes = new string[](positionCount);\r
        \r
        uint256 index = 0;\r
        for (uint256 i = 0; i < results.length; i++) {\r
            if (results[i].length > 0) {\r
                uint256 balance = abi.decode(results[i], (uint256));\r
                if (balance > 0) {\r
                    tokens[index] = targets[i];\r
                    amounts[index] = balance;\r
                    positionTypes[index] = "unknown"; // Would be determined from context\r
                    index++;\r
                }\r
            }\r
        }\r
    }\r
\r
    /**\r
     * @dev Get default position types\r
     */\r
    function getDefaultPositionTypes() internal pure returns (string[] memory) {\r
        string[] memory positionTypes = new string[](5);\r
        positionTypes[0] = "lending";\r
        positionTypes[1] = "yield";\r
        positionTypes[2] = "farming";\r
        positionTypes[3] = "staking";\r
        positionTypes[4] = "liquidity";\r
        return positionTypes;\r
    }\r
\r
    /**\r
     * @dev Validate position transfer parameters\r
     */\r
    function validatePositionTransfer(\r
        address token,\r
        address from,\r
        uint256 amount,\r
        string memory protocol,\r
        string memory positionType\r
    ) internal pure {\r
        require(token != address(0), "Invalid token address");\r
        require(from != address(0), "Invalid from address");\r
        require(amount > 0, "Amount must be greater than 0");\r
        require(bytes(protocol).length > 0, "Protocol cannot be empty");\r
        require(bytes(positionType).length > 0, "Position type cannot be empty");\r
    }\r
\r
    /**\r
     * @dev Calculate gas estimate for multicall\r
     */\r
    function estimateMulticallGas(\r
        address[] memory targets,\r
        bytes[] memory callData\r
    ) internal view returns (uint256) {\r
        uint256 baseGas = 21000; // Base transaction cost\r
        uint256 callGas = 0;\r
        \r
        for (uint256 i = 0; i < targets.length; i++) {\r
            callGas += 5000; // Estimated gas per call\r
        }\r
        \r
        return baseGas + callGas;\r
    }\r
}\r
"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "viaIR": true,
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}