liquid-funding/build/LiquidPledging_all.sol

//File: contracts/ILiquidPledgingPlugin.sol
pragma solidity ^0.4.11;

contract ILiquidPledgingPlugin {
    /// @notice Plugins are used (much like web hooks) to initiate an action
    ///  upon any donation, delegation, or transfer; this is an optional feature
    ///  and allows for extreme customization of the contract
    /// @param context The situation that is triggering the plugin:
    ///  0 -> Plugin for the owner transferring pledge to another party
    ///  1 -> Plugin for the first delegate transferring pledge to another party
    ///  2 -> Plugin for the second delegate transferring pledge to another party
    ///  ...
    ///  255 -> Plugin for the intendedProject transferring pledge to another party
    ///
    ///  256 -> Plugin for the owner receiving pledge to another party
    ///  257 -> Plugin for the first delegate receiving pledge to another party
    ///  258 -> Plugin for the second delegate receiving pledge to another party
    ///  ...
    ///  511 -> Plugin for the intendedProject receiving pledge to another party
    function beforeTransfer(
        uint64 pledgeManager,
        uint64 pledgeFrom,
        uint64 pledgeTo,
        uint64 context,
        uint amount
        ) returns (uint maxAllowed);
    function afterTransfer(
        uint64 pledgeManager,
        uint64 pledgeFrom,
        uint64 pledgeTo,
        uint64 context,
        uint amount);
}

//File: contracts/LiquidPledgingBase.sol
pragma solidity ^0.4.11;



/// @dev This is declares a few functions from `Vault` so that the
///  `LiquidPledgingBase` contract can interface with the `Vault` contract
contract Vault {
    function authorizePayment(bytes32 _ref, address _dest, uint _amount);
    function () payable;
}

contract LiquidPledgingBase {
    // Limits inserted to prevent large loops that could prevent canceling
    uint constant MAX_DELEGATES = 20;
    uint constant MAX_SUBPROJECT_LEVEL = 20;
    uint constant MAX_INTERPROJECT_LEVEL = 20;

    enum PledgeAdminType { Giver, Delegate, Project }
    enum PaymentState { Pledged, Paying, Paid } // TODO name change Pledged

    /// @dev This struct defines the details of each the PledgeAdmin, these
    ///  PledgeAdmins can own pledges and act as delegates
    struct PledgeAdmin { // TODO name change PledgeAdmin
        PledgeAdminType adminType; // Giver, Delegate or Project
        address addr; // account or contract address for admin
        string name;
        string url;
        uint64 commitTime;  // In seconds, used for Givers' & Delegates' vetos
        uint64 parentProject;  // Only for projects
        bool canceled;      //Always false except for canceled projects
        ILiquidPledgingPlugin plugin; // if the plugin is 0x0 then nothing happens if its a contract address than that smart contract is called via the milestone contract
    }

    struct Pledge {
        uint amount;
        uint64 owner; // PledgeAdmin
        uint64[] delegationChain; // list of index numbers
        uint64 intendedProject; // TODO change the name only used for when delegates are precommiting to a project
        uint64 commitTime;  // When the intendedProject will become the owner
        uint64 oldPledge; // this points to the Pledge[] index that the Pledge was derived from
        PaymentState paymentState;
    }

    Pledge[] pledges;
    PledgeAdmin[] admins; //The list of pledgeAdmins 0 means there is no admin
    Vault public vault;

    // this mapping allows you to search for a specific pledge's index number by the hash of that pledge
    mapping (bytes32 => uint64) hPledge2idx;//TODO Fix typo


/////
// Modifiers
/////

    modifier onlyVault() {
        require(msg.sender == address(vault));
        _;
    }


//////
// Constructor
//////

    /// @notice The Constructor creates the `LiquidPledgingBase` on the blockchain
    /// @param _vault Where the ETH is stored that the pledges represent
    function LiquidPledgingBase(address _vault) {
        admins.length = 1; // we reserve the 0 admin
        pledges.length = 1; // we reserve the 0 pledge
        vault = Vault(_vault);
    }


///////
// Adminss functions
//////

    /// @notice Creates a giver.
    function addGiver(string name, string url, uint64 commitTime, ILiquidPledgingPlugin plugin
        ) returns (uint64 idGiver) {

        idGiver = uint64(admins.length);

        admins.push(PledgeAdmin(
            PledgeAdminType.Giver,
            msg.sender,
            name,
            url,
            commitTime,
            0,
            false,
            plugin));

        GiverAdded(idGiver);
    }

    event GiverAdded(uint64 indexed idGiver);

    ///@notice Changes the address, name or commitTime associated with a specific giver
    function updateGiver(
        uint64 idGiver,
        address newAddr,
        string newName,
        string newUrl,
        uint64 newCommitTime)
    {
        PledgeAdmin storage giver = findAdmin(idGiver);
        require(giver.adminType == PledgeAdminType.Giver); //Must be a Giver
        require(giver.addr == msg.sender); //current addr had to originate this tx
        giver.addr = newAddr;
        giver.name = newName;
        giver.url = newUrl;
        giver.commitTime = newCommitTime;
        GiverUpdated(idGiver);
    }

    event GiverUpdated(uint64 indexed idGiver);

    /// @notice Creates a new Delegate
    function addDelegate(string name, string url, uint64 commitTime, ILiquidPledgingPlugin plugin) returns (uint64 idDelegate) { //TODO return index number

        idDelegate = uint64(admins.length);

        admins.push(PledgeAdmin(
            PledgeAdminType.Delegate,
            msg.sender,
            name,
            url,
            commitTime,
            0,
            false,
            plugin));

        DelegateAdded(idDelegate);
    }

    event DelegateAdded(uint64 indexed idDelegate);

    ///@notice Changes the address, name or commitTime associated with a specific delegate
    function updateDelegate(
        uint64 idDelegate,
        address newAddr,
        string newName,
        string newUrl,
        uint64 newCommitTime) {
        PledgeAdmin storage delegate = findAdmin(idDelegate);
        require(delegate.adminType == PledgeAdminType.Delegate);
        require(delegate.addr == msg.sender);
        delegate.addr = newAddr;
        delegate.name = newName;
        delegate.url = newUrl;
        delegate.commitTime = newCommitTime;
        DelegateUpdated(idDelegate);
    }

    event DelegateUpdated(uint64 indexed idDelegate);

    /// @notice Creates a new Project
    function addProject(string name, string url, address projectAdmin, uint64 parentProject, uint64 commitTime, ILiquidPledgingPlugin plugin) returns (uint64 idProject) {
        if (parentProject != 0) {
            PledgeAdmin storage pa = findAdmin(parentProject);
            require(pa.adminType == PledgeAdminType.Project);
            require(getProjectLevel(pa) < MAX_SUBPROJECT_LEVEL);
        }

        idProject = uint64(admins.length);

        admins.push(PledgeAdmin(
            PledgeAdminType.Project,
            projectAdmin,
            name,
            url,
            commitTime,
            parentProject,
            false,
            plugin));


        ProjectAdded(idProject);
    }

    event ProjectAdded(uint64 indexed idProject);

    ///@notice Changes the address, name or commitTime associated with a specific Project
    function updateProject(
        uint64 idProject,
        address newAddr,
        string newName,
        string newUrl,
        uint64 newCommitTime)
    {
        PledgeAdmin storage project = findAdmin(idProject);
        require(project.adminType == PledgeAdminType.Project);
        require(project.addr == msg.sender);
        project.addr = newAddr;
        project.name = newName;
        project.url = newUrl;
        project.commitTime = newCommitTime;
        ProjectUpdated(idProject);
    }

    event ProjectUpdated(uint64 indexed idAdmin);


//////////
// Public constant functions
//////////

    /// @notice Public constant that states how many pledgess are in the system
    function numberOfPledges() constant returns (uint) {
        return pledges.length - 1;
    }
    /// @notice Public constant that states the details of the specified Pledge
    function getPledge(uint64 idPledge) constant returns(
        uint amount,
        uint64 owner,
        uint64 nDelegates,
        uint64 intendedProject,
        uint64 commitTime,
        uint64 oldPledge,
        PaymentState paymentState
    ) {
        Pledge storage n = findPledge(idPledge);
        amount = n.amount;
        owner = n.owner;
        nDelegates = uint64(n.delegationChain.length);
        intendedProject = n.intendedProject;
        commitTime = n.commitTime;
        oldPledge = n.oldPledge;
        paymentState = n.paymentState;
    }
    /// @notice Public constant that states the delegates one by one, because
    ///  an array cannot be returned
    function getPledgeDelegate(uint64 idPledge, uint idxDelegate) constant returns(
        uint64 idDelegate,
        address addr,
        string name
    ) {
        Pledge storage n = findPledge(idPledge);
        idDelegate = n.delegationChain[idxDelegate - 1];
        PledgeAdmin storage delegate = findAdmin(idDelegate);
        addr = delegate.addr;
        name = delegate.name;
    }
    /// @notice Public constant that states the number of admins in the system
    function numberOfPledgeAdmins() constant returns(uint) {
        return admins.length - 1;
    }
    /// @notice Public constant that states the details of the specified admin
    function getPledgeAdmin(uint64 idAdmin) constant returns (
        PledgeAdminType adminType,
        address addr,
        string name,
        string url,
        uint64 commitTime,
        uint64 parentProject,
        bool canceled,
        address plugin)
    {
        PledgeAdmin storage m = findAdmin(idAdmin);
        adminType = m.adminType;
        addr = m.addr;
        name = m.name;
        url = m.url;
        commitTime = m.commitTime;
        parentProject = m.parentProject;
        canceled = m.canceled;
        plugin = address(m.plugin);
    }

////////
// Private methods
///////

    /// @notice All pledges technically exist... but if the pledge hasn't been
    ///  created in this system yet then it wouldn't be in the hash array
    ///  hPledge2idx[]; this creates a Pledge with and amount of 0 if one is not
    ///  created already...
    function findOrCreatePledge(
        uint64 owner,
        uint64[] delegationChain,
        uint64 intendedProject,
        uint64 commitTime,
        uint64 oldPledge,
        PaymentState paid
        ) internal returns (uint64)
    {
        bytes32 hPledge = sha3(owner, delegationChain, intendedProject, commitTime, oldPledge, paid);
        uint64 idx = hPledge2idx[hPledge];
        if (idx > 0) return idx;
        idx = uint64(pledges.length);
        hPledge2idx[hPledge] = idx;
        pledges.push(Pledge(0, owner, delegationChain, intendedProject, commitTime, oldPledge, paid));
        return idx;
    }

    function findAdmin(uint64 idAdmin) internal returns (PledgeAdmin storage) {
        require(idAdmin < admins.length);
        return admins[idAdmin];
    }

    function findPledge(uint64 idPledge) internal returns (Pledge storage) {
        require(idPledge < pledges.length);
        return pledges[idPledge];
    }

    // a constant for the case that a delegate is requested that is not a delegate in the system
    uint64 constant  NOTFOUND = 0xFFFFFFFFFFFFFFFF;

    // helper function that searches the delegationChain fro a specific delegate and
    // level of delegation returns their idx in the delegation chain which reflect their level of authority
    function getDelegateIdx(Pledge n, uint64 idDelegate) internal returns(uint64) {
        for (uint i=0; i<n.delegationChain.length; i++) {
            if (n.delegationChain[i] == idDelegate) return uint64(i);
        }
        return NOTFOUND;
    }

    // helper function that returns the pledge level solely to check that transfers
    // between Projects not violate MAX_INTERPROJECT_LEVEL
    function getPledgeLevel(Pledge n) internal returns(uint) {
        if (n.oldPledge == 0) return 0; //changed
        Pledge storage oldN = findPledge(n.oldPledge);
        return getPledgeLevel(oldN) + 1;
    }

    // helper function that returns the max commit time of the owner and all the
    // delegates
    function maxCommitTime(Pledge n) internal returns(uint commitTime) {
        PledgeAdmin storage m = findAdmin(n.owner);
        commitTime = m.commitTime;

        for (uint i=0; i<n.delegationChain.length; i++) {
            m = findAdmin(n.delegationChain[i]);
            if (m.commitTime > commitTime) commitTime = m.commitTime;
        }
    }

    // helper function that returns the project level solely to check that there
    // are not too many Projects that violate MAX_SUBCAMPAIGNS_LEVEL
    function getProjectLevel(PledgeAdmin m) internal returns(uint) {
        assert(m.adminType == PledgeAdminType.Project);
        if (m.parentProject == 0) return(1);
        PledgeAdmin storage parentNM = findAdmin(m.parentProject);
        return getProjectLevel(parentNM);
    }

    function isProjectCanceled(uint64 projectId) constant returns (bool) {
        PledgeAdmin storage m = findAdmin(projectId);
        if (m.adminType == PledgeAdminType.Giver) return false;
        assert(m.adminType == PledgeAdminType.Project);
        if (m.canceled) return true;
        if (m.parentProject == 0) return false;
        return isProjectCanceled(m.parentProject);
    }

    // @notice A helper function for canceling projects
    // @param idPledge the pledge that may or may not be canceled
    function getOldestPledgeNotCanceled(uint64 idPledge) internal constant returns(uint64) { //todo rename
        if (idPledge == 0) return 0;
        Pledge storage n = findPledge(idPledge);
        PledgeAdmin storage admin = findAdmin(n.owner);
        if (admin.adminType == PledgeAdminType.Giver) return idPledge;

        assert(admin.adminType == PledgeAdminType.Project);

        if (!isProjectCanceled(n.owner)) return idPledge;

        return getOldestPledgeNotCanceled(n.oldPledge);
    }

    function checkAdminOwner(PledgeAdmin m) internal constant {
        require((msg.sender == m.addr) || (msg.sender == address(m.plugin)));
    }
}

//File: ./contracts/LiquidPledging.sol
pragma solidity ^0.4.11;




contract LiquidPledging is LiquidPledgingBase {


//////
// Constructor
//////

    // This constructor  also calls the constructor for `LiquidPledgingBase`
    function LiquidPledging(address _vault) LiquidPledgingBase(_vault) {
    }

    /// @notice This is how value enters into the system which creates pledges;
    ///  the token of value goes into the vault and the amount in the pledge
    ///  relevant to this Giver without delegates is increased, and a normal
    ///  transfer is done to the idReceiver
    /// @param idGiver Identifier of the giver thats donating.
    /// @param idReceiver To whom it's transfered. Can be the same giver, another
    ///  giver, a delegate or a project

function donate(uint64 idGiver, uint64 idReceiver) payable {
        if (idGiver == 0) {
            idGiver = addGiver('', '', 259200, ILiquidPledgingPlugin(0x0)); // default to 3 day commitTime
        }

        PledgeAdmin storage sender = findAdmin(idGiver);

        checkAdminOwner(sender);

        require(sender.adminType == PledgeAdminType.Giver);

        uint amount = msg.value;

        require(amount > 0);

        vault.transfer(amount); // transfers the baseToken to the Vault
        uint64 idPledge = findOrCreatePledge(
            idGiver,
            new uint64[](0), //what is new?
            0,
            0,
            0,
            PaymentState.Pledged);


        Pledge storage nTo = findPledge(idPledge);
        nTo.amount += amount;

        Transfer(0, idPledge, amount);

        transfer(idGiver, idPledge, amount, idReceiver);
    }


    /// @notice Moves value between pledges
    /// @param idSender ID of the giver, delegate or project admin that is transferring
    ///  the funds from Pledge to Pledge. This admin must have permissions to move the value
    /// @param idPledge Id of the pledge that's moving the value
    /// @param amount Quantity of value that's being moved
    /// @param idReceiver Destination of the value, can be a giver sending to a giver or
    ///  a delegate, a delegate to another delegate or a project to precommit it to that project
    function transfer(uint64 idSender, uint64 idPledge, uint amount, uint64 idReceiver) {

        idPledge = normalizePledge(idPledge);

        Pledge storage n = findPledge(idPledge);
        PledgeAdmin storage receiver = findAdmin(idReceiver);
        PledgeAdmin storage sender = findAdmin(idSender);

        checkAdminOwner(sender);
        require(n.paymentState == PaymentState.Pledged);

        // If the sender is the owner
        if (n.owner == idSender) {
            if (receiver.adminType == PledgeAdminType.Giver) {
                transferOwnershipToGiver(idPledge, amount, idReceiver);
            } else if (receiver.adminType == PledgeAdminType.Project) {
                transferOwnershipToProject(idPledge, amount, idReceiver);
            } else if (receiver.adminType == PledgeAdminType.Delegate) {
                idPledge = undelegate(idPledge, amount, n.delegationChain.length);
                appendDelegate(idPledge, amount, idReceiver);
            } else {
                assert(false);
            }
            return;
        }

        // If the sender is a delegate
        uint senderDIdx = getDelegateIdx(n, idSender);
        if (senderDIdx != NOTFOUND) {

            // If the receiver is another giver
            if (receiver.adminType == PledgeAdminType.Giver) {
                // Only accept to change to the original giver to remove all delegates
                assert(n.owner == idReceiver);
                undelegate(idPledge, amount, n.delegationChain.length);
                return;
            }

            // If the receiver is another delegate
            if (receiver.adminType == PledgeAdminType.Delegate) {
                uint receiverDIdx = getDelegateIdx(n, idReceiver);

                // If the receiver is not in the delegate list
                if (receiverDIdx == NOTFOUND) {
                    idPledge = undelegate(idPledge, amount, n.delegationChain.length - senderDIdx - 1);
                    appendDelegate(idPledge, amount, idReceiver);

                // If the receiver is already part of the delegate chain and is
                // after the sender, then all of the other delegates after the sender are
                // removed and the receiver is appended at the end of the delegation chain
                } else if (receiverDIdx > senderDIdx) {
                    idPledge = undelegate(idPledge, amount, n.delegationChain.length - senderDIdx - 1);
                    appendDelegate(idPledge, amount, idReceiver);

                // If the receiver is already part of the delegate chain and is
                // before the sender, then the sender and all of the other
                // delegates after the RECEIVER are revomved from the chain,
                // this is interesting because the delegate undelegates from the
                // delegates that delegated to this delegate... game theory issues? should this be allowed
                } else if (receiverDIdx <= senderDIdx) {
                    undelegate(idPledge, amount, n.delegationChain.length - receiverDIdx -1);
                }
                return;
            }

            // If the delegate wants to support a project, they undelegate all
            // the delegates after them in the chain and choose a project
            if (receiver.adminType == PledgeAdminType.Project) {
                idPledge = undelegate(idPledge, amount, n.delegationChain.length - senderDIdx - 1);
                proposeAssignProject(idPledge, amount, idReceiver);
                return;
            }
        }
        assert(false);  // It is not the owner nor any delegate.
    }


    /// @notice This method is used to withdraw value from the system. This can be used
    ///  by the givers to avoid committing the donation or by project admin to use
    ///  the Ether.
    /// @param idPledge Id of the pledge that wants to be withdrawn.
    /// @param amount Quantity of Ether that wants to be withdrawn.
    function withdraw(uint64 idPledge, uint amount) {

        idPledge = normalizePledge(idPledge);

        Pledge storage n = findPledge(idPledge);

        require(n.paymentState == PaymentState.Pledged);

        PledgeAdmin storage owner = findAdmin(n.owner);

        checkAdminOwner(owner);

        uint64 idNewPledge = findOrCreatePledge(
            n.owner,
            n.delegationChain,
            0,
            0,
            n.oldPledge,
            PaymentState.Paying
        );

        doTransfer(idPledge, idNewPledge, amount);

        vault.authorizePayment(bytes32(idNewPledge), owner.addr, amount);
    }

    /// @notice Method called by the vault to confirm a payment.
    /// @param idPledge Id of the pledge that wants to be withdrawn.
    /// @param amount Quantity of Ether that wants to be withdrawn.
    function confirmPayment(uint64 idPledge, uint amount) onlyVault {
        Pledge storage n = findPledge(idPledge);

        require(n.paymentState == PaymentState.Paying);

        // Check the project is not canceled in the while.
        require(getOldestPledgeNotCanceled(idPledge) == idPledge);

        uint64 idNewPledge = findOrCreatePledge(
            n.owner,
            n.delegationChain,
            0,
            0,
            n.oldPledge,
            PaymentState.Paid
        );

        doTransfer(idPledge, idNewPledge, amount);
    }

    /// @notice Method called by the vault to cancel a payment.
    /// @param idPledge Id of the pledge that wants to be canceled for withdraw.
    /// @param amount Quantity of Ether that wants to be rolled back.
    function cancelPayment(uint64 idPledge, uint amount) onlyVault {
        Pledge storage n = findPledge(idPledge);

        require(n.paymentState == PaymentState.Paying); //TODO change to revert

        // When a payment is canceled, never is assigned to a project.
        uint64 oldPledge = findOrCreatePledge(
            n.owner,
            n.delegationChain,
            0,
            0,
            n.oldPledge,
            PaymentState.Pledged
        );

        oldPledge = normalizePledge(oldPledge);

        doTransfer(idPledge, oldPledge, amount);
    }

    /// @notice Method called to cancel this project.
    /// @param idProject Id of the projct that wants to be canceled.
    function cancelProject(uint64 idProject) {
        PledgeAdmin storage project = findAdmin(idProject);
        checkAdminOwner(project);
        project.canceled = true;

        CancelProject(idProject);
    }


    function cancelPledge(uint64 idPledge, uint amount) {
        idPledge = normalizePledge(idPledge);

        Pledge storage n = findPledge(idPledge);

        PledgeAdmin storage m = findAdmin(n.owner);
        checkAdminOwner(m);

        doTransfer(idPledge, n.oldPledge, amount);
    }


////////
// Multi pledge methods
////////

    // This set of functions makes moving a lot of pledges around much more
    // efficient (saves gas) than calling these functions in series
    uint constant D64 = 0x10000000000000000;
    function mTransfer(uint64 idSender, uint[] pledgesAmounts, uint64 idReceiver) {
        for (uint i = 0; i < pledgesAmounts.length; i++ ) {
            uint64 idPledge = uint64( pledgesAmounts[i] & (D64-1) );
            uint amount = pledgesAmounts[i] / D64;

            transfer(idSender, idPledge, amount, idReceiver);
        }
    }

    function mWithdraw(uint[] pledgesAmounts) {
        for (uint i = 0; i < pledgesAmounts.length; i++ ) {
            uint64 idPledge = uint64( pledgesAmounts[i] & (D64-1) );
            uint amount = pledgesAmounts[i] / D64;

            withdraw(idPledge, amount);
        }
    }

    function mConfirmPayment(uint[] pledgesAmounts) {
        for (uint i = 0; i < pledgesAmounts.length; i++ ) {
            uint64 idPledge = uint64( pledgesAmounts[i] & (D64-1) );
            uint amount = pledgesAmounts[i] / D64;

            confirmPayment(idPledge, amount);
        }
    }

    function mCancelPayment(uint[] pledgesAmounts) {
        for (uint i = 0; i < pledgesAmounts.length; i++ ) {
            uint64 idPledge = uint64( pledgesAmounts[i] & (D64-1) );
            uint amount = pledgesAmounts[i] / D64;

            cancelPayment(idPledge, amount);
        }
    }

    function mNormalizePledge(uint[] pledges) returns(uint64) {
        for (uint i = 0; i < pledges.length; i++ ) {
            uint64 idPledge = uint64( pledges[i] & (D64-1) );

            normalizePledge(idPledge);
        }
    }

////////
// Private methods
///////

    // this function is obvious, but it can also be called to undelegate everyone
    // by setting yourself as the idReceiver
    function transferOwnershipToProject(uint64 idPledge, uint amount, uint64 idReceiver) internal  {
        Pledge storage n = findPledge(idPledge);

        require(getPledgeLevel(n) < MAX_INTERPROJECT_LEVEL);
        require(!isProjectCanceled(idReceiver));

        uint64 oldPledge = findOrCreatePledge(
            n.owner,
            n.delegationChain,
            0,
            0,
            n.oldPledge,
            PaymentState.Pledged);
        uint64 toPledge = findOrCreatePledge(
            idReceiver,
            new uint64[](0),
            0,
            0,
            oldPledge,
            PaymentState.Pledged);
        doTransfer(idPledge, toPledge, amount);
    }

    function transferOwnershipToGiver(uint64 idPledge, uint amount, uint64 idReceiver) internal  {
        uint64 toPledge = findOrCreatePledge(
                idReceiver,
                new uint64[](0),
                0,
                0,
                0,
                PaymentState.Pledged);
        doTransfer(idPledge, toPledge, amount);
    }

    function appendDelegate(uint64 idPledge, uint amount, uint64 idReceiver) internal  {
        Pledge storage n= findPledge(idPledge);

        require(n.delegationChain.length < MAX_DELEGATES); //TODO change to revert and say the error
        uint64[] memory newDelegationChain = new uint64[](n.delegationChain.length + 1);
        for (uint i=0; i<n.delegationChain.length; i++) {
            newDelegationChain[i] = n.delegationChain[i];
        }

        // Make the last item in the array the idReceiver
        newDelegationChain[n.delegationChain.length] = idReceiver;

        uint64 toPledge = findOrCreatePledge(
                n.owner,
                newDelegationChain,
                0,
                0,
                n.oldPledge,
                PaymentState.Pledged);
        doTransfer(idPledge, toPledge, amount);
    }

    /// @param q Number of undelegations
    function undelegate(uint64 idPledge, uint amount, uint q) internal returns (uint64){
        Pledge storage n = findPledge(idPledge);
        uint64[] memory newDelegationChain = new uint64[](n.delegationChain.length - q);
        for (uint i=0; i<n.delegationChain.length - q; i++) {
            newDelegationChain[i] = n.delegationChain[i];
        }
        uint64 toPledge = findOrCreatePledge(
                n.owner,
                newDelegationChain,
                0,
                0,
                n.oldPledge,
                PaymentState.Pledged);
        doTransfer(idPledge, toPledge, amount);

        return toPledge;
    }


    function proposeAssignProject(uint64 idPledge, uint amount, uint64 idReceiver) internal {// Todo rename
        Pledge storage n = findPledge(idPledge);

        require(getPledgeLevel(n) < MAX_SUBPROJECT_LEVEL);
        require(!isProjectCanceled(idReceiver));

        uint64 toPledge = findOrCreatePledge(
                n.owner,
                n.delegationChain,
                idReceiver,
                uint64(getTime() + maxCommitTime(n)),
                n.oldPledge,
                PaymentState.Pledged);
        doTransfer(idPledge, toPledge, amount);
    }

    function doTransfer(uint64 from, uint64 to, uint _amount) internal {
        uint amount = callPlugins(true, from, to, _amount);
        if (from == to) return;
        if (amount == 0) return;
        Pledge storage nFrom = findPledge(from);
        Pledge storage nTo = findPledge(to);
        require(nFrom.amount >= amount);
        nFrom.amount -= amount;
        nTo.amount += amount;

        Transfer(from, to, amount);
        callPlugins(false, from, to, amount);
    }

    // This function does 2 things, #1: it checks to make sure that the pledges are correct
    // if the a pledged project has already been committed then it changes the owner
    // to be the proposed project (Pledge that the UI will have to read the commit time and manually
    // do what this function does to the pledge for the end user at the expiration of the commitTime)
    // #2: It checks to make sure that if there has been a cancellation in the chain of projects,
    // then it adjusts the pledge's owner appropriately.
    // This call can be called from any body at any time on any pledge. In general it can be called
    // to force the calls of the affected plugins, which also need to be predicted by the UI
    function normalizePledge(uint64 idPledge) returns(uint64) {
        Pledge storage n = findPledge(idPledge);

        // Check to make sure this pledge hasnt already been used or is in the process of being used
        if (n.paymentState != PaymentState.Pledged) return idPledge;

        // First send to a project if it's proposed and commited
        if ((n.intendedProject > 0) && ( getTime() > n.commitTime)) {
            uint64 oldPledge = findOrCreatePledge(
                n.owner,
                n.delegationChain,
                0,
                0,
                n.oldPledge,
                PaymentState.Pledged);
            uint64 toPledge = findOrCreatePledge(
                n.intendedProject,
                new uint64[](0),
                0,
                0,
                oldPledge,
                PaymentState.Pledged);
            doTransfer(idPledge, toPledge, n.amount);
            idPledge = toPledge;
            n = findPledge(idPledge);
        }

        toPledge = getOldestPledgeNotCanceled(idPledge);// TODO toPledge is pledge defined
        if (toPledge != idPledge) {
            doTransfer(idPledge, toPledge, n.amount);
        }

        return toPledge;
    }

/////////////
// Plugins
/////////////

    function callPlugin(bool before, uint64 adminId, uint64 fromPledge, uint64 toPledge, uint64 context, uint amount) internal returns (uint allowedAmount) {
        uint newAmount;
        allowedAmount = amount;
        PledgeAdmin storage admin = findAdmin(adminId);
        if ((address(admin.plugin) != 0) && (allowedAmount > 0)) {
            if (before) {
                newAmount = admin.plugin.beforeTransfer(adminId, fromPledge, toPledge, context, amount);
                require(newAmount <= allowedAmount);
                allowedAmount = newAmount;
            } else {
                admin.plugin.afterTransfer(adminId, fromPledge, toPledge, context, amount);
            }
        }
    }

    function callPluginsPledge(bool before, uint64 idPledge, uint64 fromPledge, uint64 toPledge, uint amount) internal returns (uint allowedAmount) {
        uint64 offset = idPledge == fromPledge ? 0 : 256;
        allowedAmount = amount;
        Pledge storage n = findPledge(idPledge);

        allowedAmount = callPlugin(before, n.owner, fromPledge, toPledge, offset, allowedAmount);

        for (uint64 i=0; i<n.delegationChain.length; i++) {
            allowedAmount = callPlugin(before, n.delegationChain[i], fromPledge, toPledge, offset + i+1, allowedAmount);
        }

        if (n.intendedProject > 0) {
            allowedAmount = callPlugin(before, n.intendedProject, fromPledge, toPledge, offset + 255, allowedAmount);
        }
    }

    function callPlugins(bool before, uint64 fromPledge, uint64 toPledge, uint amount) internal returns (uint allowedAmount) {
        allowedAmount = amount;

        allowedAmount = callPluginsPledge(before, fromPledge, fromPledge, toPledge, allowedAmount);
        allowedAmount = callPluginsPledge(before, toPledge, fromPledge, toPledge, allowedAmount);
    }

/////////////
// Test functions
/////////////

    function getTime() internal returns (uint) {
        return now;
    }

    event Transfer(uint64 indexed from, uint64 indexed to, uint amount);
    event CancelProject(uint64 indexed idProject);

}