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// Copyright 2020 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

/// @title WorkerManagerAuthManagerImpl
/// @author Danilo Tuler
pragma solidity ^0.7.0;

import "./WorkerManager.sol";
import "./WorkerAuthManager.sol";

contract WorkerManagerAuthManagerImpl is WorkerManager, WorkerAuthManager {
    /// @dev user can only hire a worker if he sends more than minimum value
    uint256 constant MINIMUM_FUNDING = 0.001 ether;

    /// @dev transfers bigger than maximum value should be done directly
    uint256 constant MAXIMUM_FUNDING = 3 ether;

    /// @notice A worker can be in 4 different states, starting from Available
    enum WorkerState {Available, Pending, Owned, Retired}

    /// @dev mapping from worker to its user
    mapping(address => address payable) private userOf;

    /// @dev mapping from worker to its internal state
    mapping(address => WorkerState) private stateOf;

    /// @dev permissions keyed by hash(user, worker, dapp)
    mapping(bytes32 => bool) private permissions;

    function isAvailable(address workerAddress)
        public
        override
        view
        returns (bool)
    {
        return stateOf[workerAddress] == WorkerState.Available;
    }

    function isPending(address workerAddress)
        public
        override
        view
        returns (bool)
    {
        return stateOf[workerAddress] == WorkerState.Pending;
    }

    function getOwner(address _workerAddress)
        public
        override(WorkerManager, WorkerAuthManager)
        view
        returns (address)
    {
        return
            stateOf[_workerAddress] == WorkerState.Owned
                ? userOf[_workerAddress]
                : address(0);
    }

    function getUser(address _workerAddress)
        public
        override
        view
        returns (address)
    {
        return userOf[_workerAddress];
    }

    function isOwned(address _workerAddress)
        public
        override
        view
        returns (bool)
    {
        return stateOf[_workerAddress] == WorkerState.Owned;
    }

    function hire(address payable _workerAddress) public override payable {
        require(isAvailable(_workerAddress), "worker is not available");
        require(_workerAddress != address(0), "worker address can not be 0x0");
        require(msg.value >= MINIMUM_FUNDING, "funding below minimum");
        require(msg.value <= MAXIMUM_FUNDING, "funding above maximum");

        // set owner
        userOf[_workerAddress] = msg.sender;

        // change state
        stateOf[_workerAddress] = WorkerState.Pending;

        // transfer ether to worker
        _workerAddress.transfer(msg.value);

        // emit event
        emit JobOffer(_workerAddress, msg.sender);
    }

    function acceptJob() public override {
        require(
            stateOf[msg.sender] == WorkerState.Pending,
            "worker not is not in pending state"
        );

        // change state
        stateOf[msg.sender] = WorkerState.Owned;
        // from now on getOwner will return the user

        // emit event
        emit JobAccepted(msg.sender, userOf[msg.sender]);
    }

    function rejectJob() public override payable {
        require(
            userOf[msg.sender] != address(0),
            "worker does not have a job offer"
        );

        address payable owner = userOf[msg.sender];

        // reset hirer back to null
        userOf[msg.sender] = address(0);

        // change state
        stateOf[msg.sender] = WorkerState.Available;

        // return the money
        owner.transfer(msg.value);

        // emit event
        emit JobRejected(msg.sender, userOf[msg.sender]);
    }

    function cancelHire(address _workerAddress) public override {
        require(
            userOf[_workerAddress] == msg.sender,
            "only hirer can cancel the offer"
        );

        // change state
        stateOf[_workerAddress] = WorkerState.Retired;

        // emit event
        emit JobRejected(_workerAddress, msg.sender);
    }

    function retire(address payable _workerAddress) public override {
        require(
            stateOf[_workerAddress] == WorkerState.Owned,
            "worker not owned"
        );
        require(
            userOf[_workerAddress] == msg.sender,
            "only owner can retire worker"
        );

        // change state
        stateOf[_workerAddress] = WorkerState.Retired;

        // emit event
        emit Retired(_workerAddress, msg.sender);
    }

    function isRetired(address _workerAddress)
        public
        override
        view
        returns (bool)
    {
        return stateOf[_workerAddress] == WorkerState.Retired;
    }

    modifier onlyByUser(address _workerAddress) {
        require(
            getUser(_workerAddress) == msg.sender,
            "worker not hired by sender"
        );
        _;
    }

    function getAuthorizationKey(
        address _user,
        address _worker,
        address _dapp
    ) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(_user, _worker, _dapp));
    }

    function authorize(address _workerAddress, address _dappAddress)
        public
        override
        onlyByUser(_workerAddress)
    {
        bytes32 key = getAuthorizationKey(
            msg.sender,
            _workerAddress,
            _dappAddress
        );
        require(permissions[key] == false, "dapp already authorized");

        // record authorization from that user
        permissions[key] = true;

        // emit event
        emit Authorization(msg.sender, _workerAddress, _dappAddress);
    }

    function deauthorize(address _workerAddress, address _dappAddress)
        public
        override
        onlyByUser(_workerAddress)
    {
        bytes32 key = getAuthorizationKey(
            msg.sender,
            _workerAddress,
            _dappAddress
        );
        require(permissions[key] == true, "dapp not authorized");

        // record deauthorization from that user
        permissions[key] = false;

        // emit event
        emit Deauthorization(msg.sender, _workerAddress, _dappAddress);
    }

    function isAuthorized(address _workerAddress, address _dappAddress)
        public
        override
        view
        returns (bool)
    {
        return
            permissions[getAuthorizationKey(
                getOwner(_workerAddress),
                _workerAddress,
                _dappAddress
            )];
    }

    function hireAndAuthorize(
        address payable _workerAddress,
        address _dappAddress
    ) public payable {
        hire(_workerAddress);
        authorize(_workerAddress, _dappAddress);
    }
}

// Copyright 2020 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

/// @title WorkerAuthManager
/// @author Danilo Tuler
pragma solidity ^0.7.0;

interface WorkerAuthManager {
    /// @notice Gives worker permission to act on a DApp
    /// @param _workerAddress address of the worker node to given permission
    /// @param _dappAddress address of the dapp that permission will be given to
    function authorize(address _workerAddress, address _dappAddress) external;

    /// @notice Removes worker's permission to act on a DApp
    /// @param _workerAddress address of the proxy that will lose permission
    /// @param _dappAddresses addresses of dapps that will lose permission
    function deauthorize(address _workerAddress, address _dappAddresses)
        external;

    /// @notice Returns is the dapp is authorized to be called by that worker
    /// @param _workerAddress address of the worker
    /// @param _dappAddress address of the DApp
    function isAuthorized(address _workerAddress, address _dappAddress)
        external
        view
        returns (bool);

    /// @notice Get the owner of the worker node
    /// @param workerAddress address of the worker node
    function getOwner(address workerAddress) external view returns (address);

    /// @notice A DApp has been authorized by a user for a worker
    event Authorization(
        address indexed user,
        address indexed worker,
        address indexed dapp
    );

    /// @notice A DApp has been deauthorized by a user for a worker
    event Deauthorization(
        address indexed user,
        address indexed worker,
        address indexed dapp
    );
}

// Copyright 2010 Cartesi Pte. Ltd.

// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.

/// @title WorkerManager
/// @author Danilo Tuler
pragma solidity ^0.7.0;

interface WorkerManager {
    /// @notice Returns true if worker node is available
    /// @param workerAddress address of the worker node
    function isAvailable(address workerAddress) external view returns (bool);

    /// @notice Returns true if worker node is pending
    /// @param workerAddress address of the worker node
    function isPending(address workerAddress) external view returns (bool);

    /// @notice Get the owner of the worker node
    /// @param workerAddress address of the worker node
    function getOwner(address workerAddress) external view returns (address);

    /// @notice Get the user of the worker node, which may not be the owner yet, or how was the previous owner of a retired node
    function getUser(address workerAddress) external view returns (address);

    /// @notice Returns true if worker node is owned by some user
    function isOwned(address workerAddress) external view returns (bool);

    /// @notice Asks the worker to work for the sender. Sender needs to pay something.
    /// @param workerAddress address of the worker
    function hire(address payable workerAddress) external payable;

    /// @notice Called by the worker to accept the job
    function acceptJob() external;

    /// @notice Called by the worker to reject a job offer
    function rejectJob() external payable;

    /// @notice Called by the user to cancel a job offer
    /// @param workerAddress address of the worker node
    function cancelHire(address workerAddress) external;

    /// @notice Called by the user to retire his worker.
    /// @param workerAddress address of the worker to be retired
    /// @dev this also removes all authorizations in place
    function retire(address payable workerAddress) external;

    /// @notice Returns true if worker node was retired by its owner
    function isRetired(address workerAddress) external view returns (bool);

    /// @notice Events signalling every state transition
    event JobOffer(address indexed worker, address indexed user);
    event JobAccepted(address indexed worker, address indexed user);
    event JobRejected(address indexed worker, address indexed user);
    event Retired(address indexed worker, address indexed user);
}

{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

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