427 lines
14 KiB
Solidity
427 lines
14 KiB
Solidity
pragma solidity ^0.4.11;
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import "./ILiquidPledgingPlugin.sol";
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import "../node_modules/giveth-common-contracts/contracts/Owned.sol";
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/// @dev This is declares a few functions from `Vault` so that the
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/// `LiquidPledgingBase` contract can interface with the `Vault` contract
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contract Vault {
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function authorizePayment(bytes32 _ref, address _dest, uint _amount);
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function () payable;
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}
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contract LiquidPledgingBase is Owned {
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// Limits inserted to prevent large loops that could prevent canceling
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uint constant MAX_DELEGATES = 20;
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uint constant MAX_SUBPROJECT_LEVEL = 20;
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uint constant MAX_INTERPROJECT_LEVEL = 20;
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enum PledgeAdminType { Giver, Delegate, Project }
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enum PaymentState { Pledged, Paying, Paid } // TODO name change Pledged
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/// @dev This struct defines the details of each the PledgeAdmin, these
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/// PledgeAdmins can own pledges and act as delegates
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struct PledgeAdmin { // TODO name change PledgeAdmin
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PledgeAdminType adminType; // Giver, Delegate or Project
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address addr; // account or contract address for admin
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string name;
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string url;
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uint64 commitTime; // In seconds, used for Givers' & Delegates' vetos
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uint64 parentProject; // Only for projects
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bool canceled; //Always false except for canceled projects
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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
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}
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struct Pledge {
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uint amount;
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uint64 owner; // PledgeAdmin
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uint64[] delegationChain; // list of index numbers
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uint64 intendedProject; // TODO change the name only used for when delegates are precommiting to a project
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uint64 commitTime; // When the intendedProject will become the owner
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uint64 oldPledge; // this points to the Pledge[] index that the Pledge was derived from
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PaymentState paymentState;
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}
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Pledge[] pledges;
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PledgeAdmin[] admins; //The list of pledgeAdmins 0 means there is no admin
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Vault public vault;
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// this mapping allows you to search for a specific pledge's index number by the hash of that pledge
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mapping (bytes32 => uint64) hPledge2idx;//TODO Fix typo
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mapping (bytes32 => bool) pluginWhitelist;
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bool public usePluginWhitelist = true;
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/////
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// Modifiers
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/////
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modifier onlyVault() {
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require(msg.sender == address(vault));
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_;
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}
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//////
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// Constructor
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//////
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/// @notice The Constructor creates the `LiquidPledgingBase` on the blockchain
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/// @param _vault Where the ETH is stored that the pledges represent
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function LiquidPledgingBase(address _vault) {
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admins.length = 1; // we reserve the 0 admin
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pledges.length = 1; // we reserve the 0 pledge
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vault = Vault(_vault);
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}
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///////
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// Admin functions
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//////
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/// @notice Creates a giver.
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function addGiver(string name, string url, uint64 commitTime, ILiquidPledgingPlugin plugin
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) returns (uint64 idGiver) {
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require(isValidPlugin(plugin));
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idGiver = uint64(admins.length);
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admins.push(PledgeAdmin(
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PledgeAdminType.Giver,
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msg.sender,
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name,
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url,
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commitTime,
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0,
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false,
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plugin));
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GiverAdded(idGiver);
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}
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event GiverAdded(uint64 indexed idGiver);
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///@notice Changes the address, name or commitTime associated with a specific giver
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function updateGiver(
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uint64 idGiver,
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address newAddr,
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string newName,
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string newUrl,
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uint64 newCommitTime)
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{
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PledgeAdmin storage giver = findAdmin(idGiver);
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require(giver.adminType == PledgeAdminType.Giver); //Must be a Giver
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require(giver.addr == msg.sender); //current addr had to originate this tx
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giver.addr = newAddr;
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giver.name = newName;
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giver.url = newUrl;
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giver.commitTime = newCommitTime;
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GiverUpdated(idGiver);
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}
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event GiverUpdated(uint64 indexed idGiver);
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/// @notice Creates a new Delegate
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function addDelegate(string name, string url, uint64 commitTime, ILiquidPledgingPlugin plugin) returns (uint64 idDelegate) { //TODO return index number
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require(isValidPlugin(plugin));
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idDelegate = uint64(admins.length);
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admins.push(PledgeAdmin(
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PledgeAdminType.Delegate,
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msg.sender,
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name,
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url,
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commitTime,
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0,
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false,
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plugin));
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DelegateAdded(idDelegate);
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}
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event DelegateAdded(uint64 indexed idDelegate);
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///@notice Changes the address, name or commitTime associated with a specific delegate
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function updateDelegate(
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uint64 idDelegate,
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address newAddr,
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string newName,
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string newUrl,
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uint64 newCommitTime) {
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PledgeAdmin storage delegate = findAdmin(idDelegate);
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require(delegate.adminType == PledgeAdminType.Delegate);
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require(delegate.addr == msg.sender);
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delegate.addr = newAddr;
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delegate.name = newName;
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delegate.url = newUrl;
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delegate.commitTime = newCommitTime;
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DelegateUpdated(idDelegate);
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}
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event DelegateUpdated(uint64 indexed idDelegate);
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/// @notice Creates a new Project
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function addProject(string name, string url, address projectAdmin, uint64 parentProject, uint64 commitTime, ILiquidPledgingPlugin plugin) returns (uint64 idProject) {
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require(isValidPlugin(plugin));
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if (parentProject != 0) {
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PledgeAdmin storage pa = findAdmin(parentProject);
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require(pa.adminType == PledgeAdminType.Project);
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require(getProjectLevel(pa) < MAX_SUBPROJECT_LEVEL);
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}
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idProject = uint64(admins.length);
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admins.push(PledgeAdmin(
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PledgeAdminType.Project,
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projectAdmin,
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name,
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url,
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commitTime,
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parentProject,
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false,
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plugin));
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ProjectAdded(idProject);
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}
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event ProjectAdded(uint64 indexed idProject);
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///@notice Changes the address, name or commitTime associated with a specific Project
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function updateProject(
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uint64 idProject,
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address newAddr,
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string newName,
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string newUrl,
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uint64 newCommitTime)
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{
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PledgeAdmin storage project = findAdmin(idProject);
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require(project.adminType == PledgeAdminType.Project);
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require(project.addr == msg.sender);
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project.addr = newAddr;
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project.name = newName;
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project.url = newUrl;
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project.commitTime = newCommitTime;
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ProjectUpdated(idProject);
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}
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event ProjectUpdated(uint64 indexed idAdmin);
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//////////
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// Public constant functions
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//////////
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/// @notice Public constant that states how many pledgess are in the system
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function numberOfPledges() constant returns (uint) {
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return pledges.length - 1;
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}
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/// @notice Public constant that states the details of the specified Pledge
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function getPledge(uint64 idPledge) constant returns(
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uint amount,
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uint64 owner,
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uint64 nDelegates,
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uint64 intendedProject,
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uint64 commitTime,
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uint64 oldPledge,
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PaymentState paymentState
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) {
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Pledge storage n = findPledge(idPledge);
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amount = n.amount;
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owner = n.owner;
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nDelegates = uint64(n.delegationChain.length);
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intendedProject = n.intendedProject;
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commitTime = n.commitTime;
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oldPledge = n.oldPledge;
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paymentState = n.paymentState;
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}
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/// @notice Public constant that states the delegates one by one, because
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/// an array cannot be returned
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function getPledgeDelegate(uint64 idPledge, uint idxDelegate) constant returns(
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uint64 idDelegate,
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address addr,
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string name
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) {
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Pledge storage n = findPledge(idPledge);
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idDelegate = n.delegationChain[idxDelegate - 1];
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PledgeAdmin storage delegate = findAdmin(idDelegate);
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addr = delegate.addr;
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name = delegate.name;
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}
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/// @notice Public constant that states the number of admins in the system
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function numberOfPledgeAdmins() constant returns(uint) {
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return admins.length - 1;
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}
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/// @notice Public constant that states the details of the specified admin
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function getPledgeAdmin(uint64 idAdmin) constant returns (
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PledgeAdminType adminType,
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address addr,
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string name,
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string url,
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uint64 commitTime,
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uint64 parentProject,
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bool canceled,
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address plugin)
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{
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PledgeAdmin storage m = findAdmin(idAdmin);
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adminType = m.adminType;
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addr = m.addr;
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name = m.name;
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url = m.url;
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commitTime = m.commitTime;
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parentProject = m.parentProject;
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canceled = m.canceled;
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plugin = address(m.plugin);
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}
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////////
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// Private methods
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///////
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/// @notice All pledges technically exist... but if the pledge hasn't been
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/// created in this system yet then it wouldn't be in the hash array
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/// hPledge2idx[]; this creates a Pledge with and amount of 0 if one is not
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/// created already...
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function findOrCreatePledge(
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uint64 owner,
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uint64[] delegationChain,
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uint64 intendedProject,
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uint64 commitTime,
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uint64 oldPledge,
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PaymentState paid
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) internal returns (uint64)
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{
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bytes32 hPledge = sha3(owner, delegationChain, intendedProject, commitTime, oldPledge, paid);
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uint64 idx = hPledge2idx[hPledge];
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if (idx > 0) return idx;
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idx = uint64(pledges.length);
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hPledge2idx[hPledge] = idx;
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pledges.push(Pledge(0, owner, delegationChain, intendedProject, commitTime, oldPledge, paid));
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return idx;
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}
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function findAdmin(uint64 idAdmin) internal returns (PledgeAdmin storage) {
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require(idAdmin < admins.length);
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return admins[idAdmin];
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}
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function findPledge(uint64 idPledge) internal returns (Pledge storage) {
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require(idPledge < pledges.length);
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return pledges[idPledge];
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}
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// a constant for the case that a delegate is requested that is not a delegate in the system
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uint64 constant NOTFOUND = 0xFFFFFFFFFFFFFFFF;
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// helper function that searches the delegationChain fro a specific delegate and
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// level of delegation returns their idx in the delegation chain which reflect their level of authority
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function getDelegateIdx(Pledge n, uint64 idDelegate) internal returns(uint64) {
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for (uint i=0; i<n.delegationChain.length; i++) {
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if (n.delegationChain[i] == idDelegate) return uint64(i);
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}
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return NOTFOUND;
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}
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// helper function that returns the pledge level solely to check that transfers
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// between Projects not violate MAX_INTERPROJECT_LEVEL
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function getPledgeLevel(Pledge n) internal returns(uint) {
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if (n.oldPledge == 0) return 0; //changed
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Pledge storage oldN = findPledge(n.oldPledge);
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return getPledgeLevel(oldN) + 1;
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}
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// helper function that returns the max commit time of the owner and all the
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// delegates
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function maxCommitTime(Pledge n) internal returns(uint commitTime) {
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PledgeAdmin storage m = findAdmin(n.owner);
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commitTime = m.commitTime;
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for (uint i=0; i<n.delegationChain.length; i++) {
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m = findAdmin(n.delegationChain[i]);
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if (m.commitTime > commitTime) commitTime = m.commitTime;
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}
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}
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// helper function that returns the project level solely to check that there
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// are not too many Projects that violate MAX_SUBCAMPAIGNS_LEVEL
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function getProjectLevel(PledgeAdmin m) internal returns(uint) {
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assert(m.adminType == PledgeAdminType.Project);
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if (m.parentProject == 0) return(1);
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PledgeAdmin storage parentNM = findAdmin(m.parentProject);
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return getProjectLevel(parentNM);
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}
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function isProjectCanceled(uint64 projectId) constant returns (bool) {
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PledgeAdmin storage m = findAdmin(projectId);
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if (m.adminType == PledgeAdminType.Giver) return false;
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assert(m.adminType == PledgeAdminType.Project);
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if (m.canceled) return true;
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if (m.parentProject == 0) return false;
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return isProjectCanceled(m.parentProject);
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}
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// @notice A helper function for canceling projects
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// @param idPledge the pledge that may or may not be canceled
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function getOldestPledgeNotCanceled(uint64 idPledge) internal constant returns(uint64) { //todo rename
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if (idPledge == 0) return 0;
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Pledge storage n = findPledge(idPledge);
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PledgeAdmin storage admin = findAdmin(n.owner);
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if (admin.adminType == PledgeAdminType.Giver) return idPledge;
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assert(admin.adminType == PledgeAdminType.Project);
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if (!isProjectCanceled(n.owner)) return idPledge;
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return getOldestPledgeNotCanceled(n.oldPledge);
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}
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function checkAdminOwner(PledgeAdmin m) internal constant {
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require((msg.sender == m.addr) || (msg.sender == address(m.plugin)));
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}
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////////
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// Plugin Whitelist Methods
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///////
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function addValidPlugin(bytes32 contractHash) external onlyOwner {
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pluginWhitelist[contractHash] = true;
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}
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function removeValidPlugin(bytes32 contractHash) external onlyOwner {
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pluginWhitelist[contractHash] = false;
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}
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function useWhitelist(bool useWhitelist) external onlyOwner {
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usePluginWhitelist = useWhitelist;
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}
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function isValidPlugin(address addr) public returns(bool) {
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if (!usePluginWhitelist || addr == 0x0) return true;
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bytes32 contractHash = getCodeHash(addr);
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return pluginWhitelist[contractHash];
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}
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function getCodeHash(address addr) public returns(bytes32) {
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bytes memory o_code;
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assembly {
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// retrieve the size of the code, this needs assembly
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let size := extcodesize(addr)
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// allocate output byte array - this could also be done without assembly
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// by using o_code = new bytes(size)
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o_code := mload(0x40)
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// new "memory end" including padding
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mstore(0x40, add(o_code, and(add(add(size, 0x20), 0x1f), not(0x1f))))
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// store length in memory
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mstore(o_code, size)
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// actually retrieve the code, this needs assembly
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extcodecopy(addr, add(o_code, 0x20), 0, size)
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}
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return keccak256(o_code);
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}
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}
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