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//SPDX-License-Identifier: MIT
pragma solidity =0.7.6;
pragma experimental ABIEncoderV2;

import "./interfaces/IPipeline.sol";
import "./libraries/LibFunction.sol";
import "@openzeppelin/contracts/token/ERC1155/ERC1155Holder.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721Holder.sol";

/**
 * @title Pipeline
 * @author Publius
 * @notice Pipeline creates a sandbox to execute any series of function calls on any series of protocols through Pipe functions.
 * Any assets left in Pipeline between transactions can be transferred out by any account.
 * Users Pipe a series of PipeCalls that each execute a function call to another protocol through Pipeline.
 * https://evmpipeline.org
 **/

contract Pipeline is IPipeline, ERC1155Holder, ERC721Holder {

    /**
     * @dev So Pipeline can receive Ether.
     */
    receive() external payable {}

    /**
     * @dev Returns the current version of Pipeline.
     */
    function version() external pure returns (string memory) {
        return "1.0.1";
    }

    /**
     * @notice Execute a single PipeCall.
     * Supports sending Ether through msg.value
     * @param p PipeCall to execute
     * @return result return value of PipeCall
    **/
    function pipe(PipeCall calldata p)
        external
        payable
        override
        returns (bytes memory result)
    {
        result = _pipe(p.target, p.data, msg.value);
    }
    
    /**
     * @notice Execute a list of executes a list of PipeCalls.
     * @param pipes list of PipeCalls to execute
     * @return results list of return values for each PipeCall
    **/
    function multiPipe(PipeCall[] calldata pipes)
        external
        payable
        override
        returns (bytes[] memory results)
    {
        results = new bytes[](pipes.length);
        for (uint256 i = 0; i < pipes.length; i++) {
            results[i] = _pipe(pipes[i].target, pipes[i].data, 0);
        }
    }

    /**
     * @notice Execute a list of AdvancedPipeCalls.
     * @param pipes list of AdvancedPipeCalls to execute
     * @return results list of return values for each AdvancedPipeCalls
    **/
    function advancedPipe(AdvancedPipeCall[] calldata pipes)
        external
        payable
        override
        returns (bytes[] memory results) {
            results = new bytes[](pipes.length);
            for (uint256 i = 0; i < pipes.length; ++i) {
                results[i] = _advancedPipe(pipes[i], results);
            }
        }

    // Execute function call using calldata
    function _pipe(
        address target,
        bytes calldata data,
        uint256 value
    ) private returns (bytes memory result) {
        bool success;
        (success, result) = target.call{value: value}(data);
        LibFunction.checkReturn(success, result);
    }

    // Execute function call using memory
    function _pipeMem(
        address target,
        bytes memory data,
        uint256 value
    ) private returns (bytes memory result) {
        bool success;
        (success, result) = target.call{value: value}(data);
        LibFunction.checkReturn(success, result);
    }

    // Execute an AdvancedPipeCall
    function _advancedPipe(
        AdvancedPipeCall calldata p,
        bytes[] memory returnData
    ) private returns (bytes memory result) {
        uint256 value = getEthValue(p.clipboard);
        // 0x00 -> Normal pipe: Standard function call
        // else > Advanced pipe: Copy return data into function call through buildAdvancedCalldata
        if (p.clipboard[0] == 0x00) {
            result = _pipe(p.target, p.callData, value);
        } else {
            result = LibFunction.useClipboard(p.callData, p.clipboard, returnData);
            result = _pipeMem(p.target, result, value);
        }
    }

    // Extracts Ether value from a Clipboard
    // clipboard[1] indicates whether there is an Ether value in the advanced data
    // if 0x00 -> No Ether value, return 0
    // else -> return the last 32 bytes of clipboard
    function getEthValue(bytes calldata clipboard) private pure returns (uint256 value) {
        if (clipboard[1] == 0x00) return 0;
        assembly { value := calldataload(sub(add(clipboard.offset, clipboard.length), 32))}
    }
}

//SPDX-License-Identifier: MIT
pragma solidity =0.7.6;
pragma experimental ABIEncoderV2;

/**
 * @title IPipeline
 * @author Publius
 * @notice Pipeline Interface – Pipeline creates a sandbox to execute any series of function calls on any series of protocols through \term{Pipe} functions. 
 * Any assets left in Pipeline between transactions can be transferred out by any account. 
 * Users Pipe a series of PipeCalls that each execute a function call to another protocol through Pipeline. 
 **/

// PipeCalls specify a function call to be executed by Pipeline. 
// Pipeline supports 2 types of PipeCalls: PipeCall and AdvancedPipeCall.

// PipeCall makes a function call with a static target address and callData.
struct PipeCall {
    address target;
    bytes data;
}

// AdvancedPipeCall makes a function call with a static target address and both static and dynamic callData.
// AdvancedPipeCalls support sending Ether in calls.
// [ PipeCall Type | Send Ether Flag | PipeCall Type data | Ether Value (only if flag == 1)]
// [ 1 byte        | 1 byte          | n bytes        | 0 or 32 bytes                      ]
// See LibFunction.useClipboard for more details.
struct AdvancedPipeCall {
    address target;
    bytes callData;
    bytes clipboard;
}

interface IPipeline {

    function pipe(PipeCall calldata p)
        external
        payable
        returns (bytes memory result);

    function multiPipe(PipeCall[] calldata pipes)
        external
        payable
        returns (bytes[] memory results);

    function advancedPipe(AdvancedPipeCall[] calldata pipes)
        external
        payable
        returns (bytes[] memory results);

}

/*
 SPDX-License-Identifier: MIT
*/

pragma solidity =0.7.6;
pragma experimental ABIEncoderV2;

/**
 * @title Lib Function
 * @author Publius
 **/

library LibFunction {
    /**
     * @notice Checks The return value of a any function call for success, if not returns the error returned in `results`
     * @param success Whether the corresponding function call succeeded
     * @param result The return data of the corresponding function call
    **/
    function checkReturn(bool success, bytes memory result) internal pure {
        if (!success) {
            // Next 5 lines from https://ethereum.stackexchange.com/a/83577
            // Also, used in Uniswap V3 https://github.com/Uniswap/v3-periphery/blob/main/contracts/base/Multicall.sol#L17
            if (result.length < 68) revert();
            assembly {
                result := add(result, 0x04)
            }
            revert(abi.decode(result, (string)));
        }
    }

    /** @notice Use a Clipboard on callData to copy return values stored as returnData from any Advanced Calls
     * that have already been executed and paste them into the callData of the next Advanced Call, in a customizable manner
     * @param callData The callData bytes of next Advanced Call to paste onto
     * @param clipboard 0, 1 or n encoded paste operations and encoded ether value if using Pipeline
     * -------------------------------------------------------------------------------------
     * Clipboard stores the bytes:
     * [ Type   | Use Ether Flag*  | Type data      | Ether Value (only if flag == 1)*]
     * [ 1 byte | 1 byte           | n bytes        | 0 or 32 bytes                   ]
     * * Use Ether Flag and Ether Value are processed in Pipeline.sol (Not used in Farm). See Pipeline.getEthValue for ussage.
     * Type: 0x00, 0x01 or 0x002
     *  - 0x00: 0 Paste Operations (Logic in Pipeline.sol and FarmFacet.sol)
     *  - 0x01: 1 Paste Operation
     *  - 0x02: n Paste Operations
     * Type Data: There are two types with type data: 0x01, 0x02
     *  Type 1 (0x01): Copy 1 bytes32 from a previous function return value
     *       [ pasteParams ]
     *       [ 32 bytes ]
     *      Note: Should be encoded with ['bytes2', 'uint80', 'uint80', 'uint80']  where the first two bytes are Type and Send Ether Flag if using Pipeline
     *  Type 2 (0x02): Copy n bytes32 from a previous function return value
     *       [ Padding      | pasteParams[] ]
     *       [ 32 bytes     | 32 + 32 * n   ]
     *        * The first 32 bytes are the length of the array.
     * -------------------------------------------------------------------------------------
     * @param returnData A list of return values from previously executed Advanced Calls
     @return data The function call return datas
    **/
    function useClipboard(
        bytes calldata callData,
        bytes calldata clipboard,
        bytes[] memory returnData
    ) internal pure returns (bytes memory data) {
        bytes1 typeId = clipboard[0];
        if (typeId == 0x01) {
            bytes32 pasteParams = abi.decode(clipboard, (bytes32));
            data = LibFunction.pasteAdvancedBytes(callData, returnData, pasteParams);
        } else if (typeId == 0x02) {
            (, bytes32[] memory pasteParams) = abi.decode(
                clipboard,
                (uint256, bytes32[])
            );
            data = callData;
            for (uint256 i; i < pasteParams.length; i++)
                data = LibFunction.pasteAdvancedBytes(data, returnData, pasteParams[i]);
        } else {
            revert("Function: Advanced Type not supported");
        }
    }

    /**
     * @notice Copies 32 bytes from returnData into callData determined by pasteParams
     * @param callData The callData bytes of the next function call
     * @param returnData A list of bytes corresponding to return data from previous function calls in the transaction
     * @param pasteParams Denotes which data should be copied and where it should be pasted
     * Should be in the following format
     * [2 bytes | 10 bytes         | 10 bytes  | 10 bytes   ]
     * [ N/A    | returnDataIndex  | copyIndex | pasteIndex ]
     * @return pastedData the calldata for the next function call with bytes pasted from returnData
     **/
    function pasteAdvancedBytes(
        bytes memory callData,
        bytes[] memory returnData,
        bytes32 pasteParams
    ) internal pure returns (bytes memory pastedData) {
        // Shift `pasteParams` right 22 bytes to insolated reduceDataIndex
        bytes memory copyData = returnData[uint256((pasteParams << 16) >> 176)];
        pastedData = paste32Bytes(
            copyData,
            callData,
            uint256((pasteParams << 96) >> 176), // Isolate copyIndex
            uint256((pasteParams << 176) >> 176) // Isolate pasteIndex
        );
    }

    /**
     * @notice Copy 32 Bytes from copyData at copyIndex and paste into pasteData at pasteIndex
     * @param copyData The data bytes to copy from
     * @param pasteData The data bytes to paste into
     * @param copyIndex The index in copyData to copying from
     * @param pasteIndex The index in pasteData to paste into
     * @return pastedData The data with the copied with 32 bytes
    **/
    function paste32Bytes(
        bytes memory copyData,
        bytes memory pasteData,
        uint256 copyIndex,
        uint256 pasteIndex
    ) internal pure returns (bytes memory pastedData) {
        assembly {
            mstore(add(pasteData, pasteIndex), mload(add(copyData, copyIndex)))
        }
        pastedData = pasteData;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./ERC1155Receiver.sol";

/**
 * @dev _Available since v3.1._
 */
contract ERC1155Holder is ERC1155Receiver {
    function onERC1155Received(address, address, uint256, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(address, address, uint256[] memory, uint256[] memory, bytes memory) public virtual override returns (bytes4) {
        return this.onERC1155BatchReceived.selector;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC721Receiver.sol";

  /**
   * @dev Implementation of the {IERC721Receiver} interface.
   *
   * Accepts all token transfers. 
   * Make sure the contract is able to use its token with {IERC721-safeTransferFrom}, {IERC721-approve} or {IERC721-setApprovalForAll}.
   */
contract ERC721Holder is IERC721Receiver {

    /**
     * @dev See {IERC721Receiver-onERC721Received}.
     *
     * Always returns `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(address, address, uint256, bytes memory) public virtual override returns (bytes4) {
        return this.onERC721Received.selector;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC1155Receiver.sol";
import "../../introspection/ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    constructor() internal {
        _registerInterface(
            ERC1155Receiver(address(0)).onERC1155Received.selector ^
            ERC1155Receiver(address(0)).onERC1155BatchReceived.selector
        );
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "../../introspection/IERC165.sol";

/**
 * _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {

    /**
        @dev Handles the receipt of a single ERC1155 token type. This function is
        called at the end of a `safeTransferFrom` after the balance has been updated.
        To accept the transfer, this must return
        `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
        (i.e. 0xf23a6e61, or its own function selector).
        @param operator The address which initiated the transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param id The ID of the token being transferred
        @param value The amount of tokens being transferred
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
    */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    )
        external
        returns(bytes4);

    /**
        @dev Handles the receipt of a multiple ERC1155 token types. This function
        is called at the end of a `safeBatchTransferFrom` after the balances have
        been updated. To accept the transfer(s), this must return
        `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
        (i.e. 0xbc197c81, or its own function selector).
        @param operator The address which initiated the batch transfer (i.e. msg.sender)
        @param from The address which previously owned the token
        @param ids An array containing ids of each token being transferred (order and length must match values array)
        @param values An array containing amounts of each token being transferred (order and length must match ids array)
        @param data Additional data with no specified format
        @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
    */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    )
        external
        returns(bytes4);
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * 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[EIP 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);
}

{
  "remappings": [
    "@openzeppelin/=node_modules/@openzeppelin/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "forge-std/=lib/forge-std/src/",
    "hardhat/=node_modules/hardhat/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs"
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "istanbul",
  "viaIR": false,
  "libraries": {}
}

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