CreatorLiquidDemocracy

// Submitted by EthereumHistory (ethereumhistory.com)
pragma solidity ^0.4.4;
/**
 * @title Contract for object that have an owner
 */
contract Owned {
    /**
     * Contract owner address
     */
    address public owner;

    /**
     * @dev Store owner on creation
     */
    function Owned() { owner = msg.sender; }

    /**
     * @dev Delegate contract to another person
     * @param _owner is another person address
     */
    function delegate(address _owner) onlyOwner
    { owner = _owner; }

    /**
     * @dev Owner check modifier
     */
    modifier onlyOwner { if (msg.sender != owner) throw; _; }
}

pragma solidity ^0.4.4;

/**
 * @title Contract for objects that can be morder
 */
contract Mortal is Owned {
    /**
     * @dev Destroy contract and scrub a data
     * @notice Only owner can kill me
     */
    function kill() onlyOwner
    { suicide(owner); }
}

pragma solidity ^0.4.4;

// Standard token interface (ERC 20)
// https://github.com/ethereum/EIPs/issues/20
contract ERC20 
{
// Functions:
    /// @return total amount of tokens
    uint256 public totalSupply;

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant returns (uint256);

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _value) returns (bool);

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _value) returns (bool);

    /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint256 _value) returns (bool);

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) constant returns (uint256);

// Events:
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

pragma solidity ^0.4.4;


/**
 * @title Token contract represents any asset in digital economy
 */
contract Token is Mortal, ERC20 {
    /* Short description of token */
    string public name;
    string public symbol;

    /* Total count of tokens exist */
    uint public totalSupply;

    /* Fixed point position */
    uint8 public decimals;
    
    /* Token approvement system */
    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowances;
 
    /**
     * @dev Get balance of plain address
     * @param _owner is a target address
     * @return amount of tokens on balance
     */
    function balanceOf(address _owner) constant returns (uint256)
    { return balances[_owner]; }
 
    /**
     * @dev Take allowed tokens
     * @param _owner The address of the account owning tokens
     * @param _spender The address of the account able to transfer the tokens
     * @return Amount of remaining tokens allowed to spent
     */
    function allowance(address _owner, address _spender) constant returns (uint256)
    { return allowances[_owner][_spender]; }

    /* Token constructor */
    function Token(string _name, string _symbol, uint8 _decimals, uint _count) {
        name        = _name;
        symbol      = _symbol;
        decimals    = _decimals;
        totalSupply = _count;
        balances[msg.sender] = _count;
    }
 
    /**
     * @dev Transfer self tokens to given address
     * @param _to destination address
     * @param _value amount of token values to send
     * @notice `_value` tokens will be sended to `_to`
     * @return `true` when transfer done
     */
    function transfer(address _to, uint _value) returns (bool) {
        if (balances[msg.sender] >= _value) {
            balances[msg.sender] -= _value;
            balances[_to]        += _value;
            Transfer(msg.sender, _to, _value);
            return true;
        }
        return false;
    }

    /**
     * @dev Transfer with approvement mechainsm
     * @param _from source address, `_value` tokens shold be approved for `sender`
     * @param _to destination address
     * @param _value amount of token values to send 
     * @notice from `_from` will be sended `_value` tokens to `_to`
     * @return `true` when transfer is done
     */
    function transferFrom(address _from, address _to, uint256 _value) returns (bool) {
        var avail = allowances[_from][msg.sender]
                  > balances[_from] ? balances[_from]
                                    : allowances[_from][msg.sender];
        if (avail >= _value) {
            allowances[_from][msg.sender] -= _value;
            balances[_from] -= _value;
            balances[_to]   += _value;
            Transfer(_from, _to, _value);
            return true;
        }
        return false;
    }

    /**
     * @dev Give to target address ability for self token manipulation without sending
     * @param _spender target address (future requester)
     * @param _value amount of token values for approving
     */
    function approve(address _spender, uint256 _value) returns (bool) {
        allowances[msg.sender][_spender] += _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    /**
     * @dev Reset count of tokens approved for given address
     * @param _spender target address (future requester)
     */
    function unapprove(address _spender)
    { allowances[msg.sender][_spender] = 0; }
}

pragma solidity ^0.4.4;

contract LiquidDemocracy {
    Token public votingToken;
    bool  underExecution;
    address public appointee;
    mapping (address => uint) public voterId;
    mapping (address => uint256) public voteWeight;

    uint public delegatedPercent;
    uint public lastWeightCalculation;
    uint public numberOfDelegationRounds;

    uint public numberOfVotes;
    DelegatedVote[] public delegatedVotes;
    string public forbiddenFunction;

    event NewAppointee(address newAppointee, bool changed);

    struct DelegatedVote {
        address nominee;
        address voter;
    }

    function LiquidDemocracy(
        address votingWeightToken,
        string forbiddenFunctionCall,
        uint percentLossInEachRound
    ) {
        votingToken = Token(votingWeightToken);
        delegatedVotes.length++;
        delegatedVotes[0] = DelegatedVote({nominee: 0, voter: 0});
        forbiddenFunction = forbiddenFunctionCall;
        delegatedPercent = 100 - percentLossInEachRound;
        if (delegatedPercent > 100) delegatedPercent = 100;
    }

    function vote(address nominatedAddress) returns (uint voteIndex) {
        if (voterId[msg.sender]== 0) {
            voterId[msg.sender] = delegatedVotes.length;
            numberOfVotes++;
            voteIndex = delegatedVotes.length++;
            numberOfVotes = voteIndex;
        }
        else {
            voteIndex = voterId[msg.sender];
        }

        delegatedVotes[voteIndex] = DelegatedVote({nominee: nominatedAddress, voter: msg.sender});
    }

    function execute(address target, uint valueInEther, bytes32 bytecode) {
        if (msg.sender != appointee                                 // If caller is the current appointee,
            || underExecution //                                    // if the call is being executed,
            || bytes4(bytecode) == bytes4(sha3(forbiddenFunction))  // and it's not trying to do the forbidden function
            || numberOfDelegationRounds < 4 )                       // and delegation has been calculated enough
            throw;

        underExecution = true;

        if (!target.call.value(valueInEther * 1 ether)(bytecode)) { // Then execute the command.
            throw;
        }
        else {
          underExecution = false;
        }
    }

    function calculateVotes() returns (address winner) {
        address currentWinner = appointee;
        uint currentMax = 0;
        uint weight = 0;
        DelegatedVote v = delegatedVotes[0];

        if (now > lastWeightCalculation + 90 minutes) {
            numberOfDelegationRounds = 0;
            lastWeightCalculation = now;

            // Distribute the initial weight
            for (uint i=1; i< delegatedVotes.length; i++) {
                voteWeight[delegatedVotes[i].nominee] = 0;
            }
            for (i=1; i< delegatedVotes.length; i++) {
                voteWeight[delegatedVotes[i].voter] = votingToken.balanceOf(delegatedVotes[i].voter);
            }
        }
        else {
            numberOfDelegationRounds++;
            uint lossRatio = 100 * delegatedPercent ** numberOfDelegationRounds / 100 ** numberOfDelegationRounds;
            if (lossRatio > 0) {
                for (i=1; i< delegatedVotes.length; i++){
                    v = delegatedVotes[i];

                    if (v.nominee != v.voter && voteWeight[v.voter] > 0) {
                        weight = voteWeight[v.voter] * lossRatio / 100;
                        voteWeight[v.voter] -= weight;
                        voteWeight[v.nominee] += weight;
                    }

                    if (numberOfDelegationRounds>3 && voteWeight[v.nominee] > currentMax) {
                        currentWinner = v.nominee;
                        currentMax = voteWeight[v.nominee];
                    }
                }
            }
        }

        if (numberOfDelegationRounds > 3) {
            NewAppointee(currentWinner, appointee == currentWinner);
            appointee = currentWinner;
        }

        return currentWinner;
    }

    function () payable {}
}

pragma solidity ^0.4.4;

library CreatorLiquidDemocracy {
    function create(address votingWeightToken, string forbiddenFunctionCall, uint256 percentLossInEachRound) returns (LiquidDemocracy)
    { return new LiquidDemocracy(votingWeightToken, forbiddenFunctionCall, percentLossInEachRound); }

    function version() constant returns (string)
    { return "v0.5.0 (6d589277)"; }

    function abi() constant returns (string)
    { return '[{"constant":true,"inputs":[],"name":"numberOfVotes","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"lastWeightCalculation","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"delegatedPercent","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"voterId","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"nominatedAddress","type":"address"}],"name":"vote","outputs":[{"name":"voteIndex","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"voteWeight","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"numberOfDelegationRounds","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"appointee","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"votingToken","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"forbiddenFunction","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"target","type":"address"},{"name":"valueInEther","type":"uint256"},{"name":"bytecode","type":"bytes32"}],"name":"execute","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"delegatedVotes","outputs":[{"name":"nominee","type":"address"},{"name":"voter","type":"address"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"calculateVotes","outputs":[{"name":"winner","type":"address"}],"payable":false,"type":"function"},{"inputs":[{"name":"votingWeightToken","type":"address"},{"name":"forbiddenFunctionCall","type":"string"},{"name":"percentLossInEachRound","type":"uint256"}],"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newAppointee","type":"address"},{"indexed":false,"name":"changed","type":"bool"}],"name":"NewAppointee","type":"event"}]'; }
}