FlashloanArbitrage

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC1363.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
"
    },
    "@openzeppelin/contracts/interfaces/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

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

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}
"
    },
    "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
"
    },
    "@openzeppelin/contracts/utils/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/ReentrancyGuard.sol)

pragma solidity ^0.8.20;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant NOT_ENTERED = 1;
    uint256 private constant ENTERED = 2;

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        _status = ENTERED;
    }

    function _nonReentrantAfter() private {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = NOT_ENTERED;
    }

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}
"
    },
    "contracts/FlashloanArbitrage.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
import "@openzeppelin/contracts/access/Ownable.sol";\r
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";\r
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";\r
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";\r
import "./interfaces/IFlashLoanReceiver.sol";\r
import "./interfaces/ILendingPool.sol";\r
import "./interfaces/IUniswapV2Router.sol";\r
import "./interfaces/IUniswapV3Router.sol";\r
import "./libraries/ArbitrageLib.sol";\r
\r
/**\r
 * @title FlashloanArbitrage\r
 * @dev Contract for executing flashloan arbitrage between different DEXs\r
 */\r
contract FlashloanArbitrage is IFlashLoanReceiver, Ownable, ReentrancyGuard {\r
    using SafeERC20 for IERC20;\r
    using ArbitrageLib for uint256;\r
\r
    struct ArbitrageParams {\r
        address token0;\r
        address token1;\r
        uint256 amount;\r
        address dexA;\r
        address dexB;\r
        bytes routerCalldata;\r
        uint256 minProfit;\r
    }\r
\r
    // Aave Lending Pool\r
    ILendingPool public immutable LENDING_POOL;\r
    \r
    // DEX Routers\r
    IUniswapV2Router public immutable UNISWAP_V2_ROUTER;\r
    IUniswapV3Router public immutable UNISWAP_V3_ROUTER;\r
    IUniswapV2Router public immutable SUSHISWAP_ROUTER;\r
\r
    // Configuration\r
    uint256 public maxGasPrice = 50 gwei;\r
    uint256 public minProfitBps = 50; // 0.5%\r
    mapping(address => bool) public authorizedCallers;\r
\r
    event ArbitrageExecuted(\r
        address indexed token0,\r
        address indexed token1,\r
        uint256 amount,\r
        uint256 profit,\r
        address dexA,\r
        address dexB\r
    );\r
\r
    event FlashloanDetails(\r
        address indexed asset,\r
        uint256 amount,\r
        uint256 fee,\r
        uint256 balanceBefore,\r
        uint256 balanceAfter,\r
        uint256 totalProfit,\r
        address profitToken\r
    );\r
\r
    event ProfitWithdrawn(address indexed token, uint256 amount);\r
    event ConfigUpdated(uint256 maxGasPrice, uint256 minProfitBps);\r
\r
    modifier onlyAuthorized() {\r
        require(\r
            authorizedCallers[msg.sender] || msg.sender == owner(),\r
            "Not authorized"\r
        );\r
        _;\r
    }\r
\r
    modifier gasOptimized() {\r
        require(tx.gasprice <= maxGasPrice, "Gas price too high");\r
        _;\r
    }\r
\r
    constructor(\r
        address _lendingPool,\r
        address _uniswapV2Router,\r
        address _uniswapV3Router,\r
        address _sushiswapRouter,\r
        address _owner\r
    ) Ownable(_owner) {\r
        LENDING_POOL = ILendingPool(_lendingPool);\r
        UNISWAP_V2_ROUTER = IUniswapV2Router(_uniswapV2Router);\r
        UNISWAP_V3_ROUTER = IUniswapV3Router(_uniswapV3Router);\r
        SUSHISWAP_ROUTER = IUniswapV2Router(_sushiswapRouter);\r
        \r
        // Authorize owner by default\r
        authorizedCallers[_owner] = true;\r
    }\r
\r
    /**\r
     * @dev Execute flashloan arbitrage\r
     * @param params Arbitrage parameters\r
     */\r
    function executeArbitrage(\r
        ArbitrageParams calldata params\r
    ) external onlyAuthorized gasOptimized nonReentrant {\r
        require(params.amount > 0, "Invalid amount");\r
        require(params.token0 != params.token1, "Same tokens");\r
        require(params.minProfit > 0, "Invalid min profit");\r
\r
        // Encode arbitrage parameters for flashloan callback\r
        bytes memory data = abi.encode(params);\r
\r
        // Request flashloan from Aave\r
        address[] memory assets = new address[](1);\r
        uint256[] memory amounts = new uint256[](1);\r
        uint256[] memory modes = new uint256[](1);\r
\r
        assets[0] = params.token0;\r
        amounts[0] = params.amount;\r
        modes[0] = 0; // No debt\r
\r
        LENDING_POOL.flashLoan(\r
            address(this),\r
            assets,\r
            amounts,\r
            modes,\r
            address(this),\r
            data,\r
            0\r
        );\r
    }\r
\r
    /**\r
     * @dev Aave flashloan callback\r
     */\r
    function executeOperation(\r
        address[] calldata assets,\r
        uint256[] calldata amounts,\r
        uint256[] calldata premiums,\r
        address initiator,\r
        bytes calldata params\r
    ) external override returns (bool) {\r
        require(msg.sender == address(LENDING_POOL), "Invalid caller");\r
        require(initiator == address(this), "Invalid initiator");\r
\r
        ArbitrageParams memory arbParams = abi.decode(params, (ArbitrageParams));\r
        \r
        // Record balance before arbitrage\r
        uint256 balanceBefore = IERC20(assets[0]).balanceOf(address(this));\r
        \r
        // Execute arbitrage logic\r
        uint256 profit = _executeArbitrageLogic(arbParams);\r
        \r
        require(profit >= arbParams.minProfit, "Insufficient profit");\r
\r
        // Record balance after arbitrage\r
        uint256 balanceAfter = IERC20(assets[0]).balanceOf(address(this));\r
        \r
        // Repay flashloan\r
        uint256 amountOwing = amounts[0] + premiums[0];\r
        IERC20(assets[0]).safeTransfer(address(LENDING_POOL), amountOwing);\r
\r
        // Emit detailed flashloan information\r
        emit FlashloanDetails(\r
            assets[0],              // asset address\r
            amounts[0],             // flashloan amount\r
            premiums[0],            // flashloan fee\r
            balanceBefore,          // balance before arbitrage\r
            balanceAfter,           // balance after arbitrage\r
            profit,                 // total profit\r
            assets[0]               // profit token (same as flashloan asset)\r
        );\r
\r
        emit ArbitrageExecuted(\r
            arbParams.token0,\r
            arbParams.token1,\r
            arbParams.amount,\r
            profit,\r
            arbParams.dexA,\r
            arbParams.dexB\r
        );\r
\r
        return true;\r
    }\r
\r
    /**\r
     * @dev Execute the actual arbitrage logic\r
     */\r
    function _executeArbitrageLogic(\r
        ArbitrageParams memory params\r
    ) internal returns (uint256 profit) {\r
        uint256 initialBalance = IERC20(params.token0).balanceOf(address(this));\r
\r
        // Step 1: Swap on DEX A (buy low)\r
        _swapOnDex(\r
            params.dexA,\r
            params.token0,\r
            params.token1,\r
            params.amount,\r
            true\r
        );\r
\r
        uint256 token1Balance = IERC20(params.token1).balanceOf(address(this));\r
\r
        // Step 2: Swap on DEX B (sell high)\r
        _swapOnDex(\r
            params.dexB,\r
            params.token1,\r
            params.token0,\r
            token1Balance,\r
            false\r
        );\r
\r
        uint256 finalBalance = IERC20(params.token0).balanceOf(address(this));\r
        \r
        // Calculate profit (excluding flashloan fees)\r
        profit = finalBalance > initialBalance ? \r
            finalBalance - initialBalance : 0;\r
    }\r
\r
    /**\r
     * @dev Execute swap on specified DEX\r
     */\r
    function _swapOnDex(\r
        address dex,\r
        address tokenIn,\r
        address tokenOut,\r
        uint256 amountIn,\r
        bool isFirstSwap\r
    ) internal {\r
        IERC20(tokenIn).forceApprove(dex, amountIn);\r
\r
        if (dex == address(UNISWAP_V2_ROUTER) || dex == address(SUSHISWAP_ROUTER)) {\r
            _swapOnUniswapV2(dex, tokenIn, tokenOut, amountIn);\r
        } else if (dex == address(UNISWAP_V3_ROUTER)) {\r
            _swapOnUniswapV3(tokenIn, tokenOut, amountIn);\r
        } else {\r
            revert("Unsupported DEX");\r
        }\r
    }\r
\r
    /**\r
     * @dev Swap on Uniswap V2 or SushiSwap\r
     */\r
    function _swapOnUniswapV2(\r
        address router,\r
        address tokenIn,\r
        address tokenOut,\r
        uint256 amountIn\r
    ) internal {\r
        address[] memory path = new address[](2);\r
        path[0] = tokenIn;\r
        path[1] = tokenOut;\r
\r
        IUniswapV2Router(router).swapExactTokensForTokens(\r
            amountIn,\r
            0, // Accept any amount of tokens out\r
            path,\r
            address(this),\r
            block.timestamp + 300\r
        );\r
    }\r
\r
    /**\r
     * @dev Swap on Uniswap V3\r
     */\r
    function _swapOnUniswapV3(\r
        address tokenIn,\r
        address tokenOut,\r
        uint256 amountIn\r
    ) internal {\r
        IUniswapV3Router.ExactInputSingleParams memory params = IUniswapV3Router\r
            .ExactInputSingleParams({\r
                tokenIn: tokenIn,\r
                tokenOut: tokenOut,\r
                fee: 3000, // 0.3% fee tier\r
                recipient: address(this),\r
                deadline: block.timestamp + 300,\r
                amountIn: amountIn,\r
                amountOutMinimum: 0,\r
                sqrtPriceLimitX96: 0\r
            });\r
\r
        UNISWAP_V3_ROUTER.exactInputSingle(params);\r
    }\r
\r
    /**\r
     * @dev Get estimated profit for arbitrage opportunity\r
     */\r
    function getEstimatedProfit(\r
        ArbitrageParams calldata params\r
    ) external view returns (uint256 estimatedProfit, bool isProfitable) {\r
        // This would contain complex price calculation logic\r
        // For now, returning placeholder values\r
        estimatedProfit = 0;\r
        isProfitable = false;\r
    }\r
\r
    /**\r
     * @dev Update configuration\r
     */\r
    function updateConfig(\r
        uint256 _maxGasPrice,\r
        uint256 _minProfitBps\r
    ) external onlyOwner {\r
        maxGasPrice = _maxGasPrice;\r
        minProfitBps = _minProfitBps;\r
        emit ConfigUpdated(_maxGasPrice, _minProfitBps);\r
    }\r
\r
    /**\r
     * @dev Add/remove authorized caller\r
     */\r
    function setAuthorizedCaller(\r
        address caller,\r
        bool authorized\r
    ) external onlyOwner {\r
        authorizedCallers[caller] = authorized;\r
    }\r
\r
    /**\r
     * @dev Withdraw profits\r
     */\r
    function withdrawProfits(\r
        address token,\r
        uint256 amount\r
    ) external onlyOwner {\r
        IERC20(token).safeTransfer(owner(), amount);\r
        emit ProfitWithdrawn(token, amount);\r
    }\r
\r
    /**\r
     * @dev Emergency withdraw all tokens\r
     */\r
    function emergencyWithdraw(address token) external onlyOwner {\r
        uint256 balance = IERC20(token).balanceOf(address(this));\r
        if (balance > 0) {\r
            IERC20(token).safeTransfer(owner(), balance);\r
        }\r
    }\r
\r
    /**\r
     * @dev Receive ETH\r
     */\r
    receive() external payable {}\r
}"
    },
    "contracts/interfaces/IFlashLoanReceiver.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
interface IFlashLoanReceiver {\r
    function executeOperation(\r
        address[] calldata assets,\r
        uint256[] calldata amounts,\r
        uint256[] calldata premiums,\r
        address initiator,\r
        bytes calldata params\r
    ) external returns (bool);\r
}"
    },
    "contracts/interfaces/ILendingPool.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
interface ILendingPool {\r
    function flashLoan(\r
        address receiverAddress,\r
        address[] calldata assets,\r
        uint256[] calldata amounts,\r
        uint256[] calldata modes,\r
        address onBehalfOf,\r
        bytes calldata params,\r
        uint16 referralCode\r
    ) external;\r
}"
    },
    "contracts/interfaces/IUniswapV2Router.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
interface IUniswapV2Router {\r
    function swapExactTokensForTokens(\r
        uint amountIn,\r
        uint amountOutMin,\r
        address[] calldata path,\r
        address to,\r
        uint deadline\r
    ) external returns (uint[] memory amounts);\r
\r
    function getAmountsOut(uint amountIn, address[] calldata path)\r
        external view returns (uint[] memory amounts);\r
}"
    },
    "contracts/interfaces/IUniswapV3Router.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
interface IUniswapV3Router {\r
    struct ExactInputSingleParams {\r
        address tokenIn;\r
        address tokenOut;\r
        uint24 fee;\r
        address recipient;\r
        uint256 deadline;\r
        uint256 amountIn;\r
        uint256 amountOutMinimum;\r
        uint160 sqrtPriceLimitX96;\r
    }\r
\r
    function exactInputSingle(ExactInputSingleParams calldata params)\r
        external payable returns (uint256 amountOut);\r
}"
    },
    "contracts/libraries/ArbitrageLib.sol": {
      "content": "// SPDX-License-Identifier: MIT\r
pragma solidity ^0.8.20;\r
\r
library ArbitrageLib {\r
    uint256 private constant BASIS_POINTS = 10000;\r
\r
    /**\r
     * @dev Calculate profit percentage in basis points\r
     */\r
    function calculateProfitBps(\r
        uint256 initialAmount,\r
        uint256 finalAmount\r
    ) internal pure returns (uint256) {\r
        if (finalAmount <= initialAmount) return 0;\r
        \r
        uint256 profit = finalAmount - initialAmount;\r
        return (profit * BASIS_POINTS) / initialAmount;\r
    }\r
\r
    /**\r
     * @dev Check if profit meets minimum threshold\r
     */\r
    function isProfitable(\r
        uint256 initialAmount,\r
        uint256 finalAmount,\r
        uint256 minProfitBps\r
    ) internal pure returns (bool) {\r
        return calculateProfitBps(initialAmount, finalAmount) >= minProfitBps;\r
    }\r
\r
    /**\r
     * @dev Calculate amount after slippage\r
     */\r
    function applySlippage(\r
        uint256 amount,\r
        uint256 slippageBps\r
    ) internal pure returns (uint256) {\r
        return amount - (amount * slippageBps) / BASIS_POINTS;\r
    }\r
\r
    /**\r
     * @dev Estimate gas cost in token terms\r
     */\r
    function estimateGasCost(\r
        uint256 gasUsed,\r
        uint256 gasPrice,\r
        uint256 ethPriceInToken\r
    ) internal pure returns (uint256) {\r
        uint256 gasCostInEth = gasUsed * gasPrice;\r
        return (gasCostInEth * ethPriceInToken) / 1e18;\r
    }\r
}"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "viaIR": true,
    "evmVersion": "paris",
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}