594 lines
23 KiB
Solidity
594 lines
23 KiB
Solidity
pragma solidity ^0.4.11;
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/*
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Copyright 2017, Jordi Baylina
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Contributors: Adrià Massanet <adria@codecontext.io>, RJ Ewing, Griff
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Green, Arthur Lunn
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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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 an interface for `LPVault` which serves as a secure storage for
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/// the ETH that backs the Pledges, only after `LiquidPledging` authorizes
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/// payments can Pledges be converted for ETH
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interface LPVault {
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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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/// @dev `LiquidPledgingBase` is the base level contract used to carry out
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/// liquidPledging's most basic functions, mostly handling and searching the
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/// data structures
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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 PledgeState { Pledged, Paying, Paid }
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/// @dev This struct defines the details of a `PledgeAdmin` which are
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/// commonly referenced by their index in the `admins` array
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/// and can own pledges and act as delegates
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struct 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; // Can be IPFS hash
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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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/// @dev if the plugin is 0x0 then nothing happens, if its an address
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// than that smart contract is called when appropriate
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ILiquidPledgingPlugin plugin;
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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 delegates in order of authority
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uint64 intendedProject; // Used when delegates are sending to projects
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uint64 commitTime; // When the intendedProject will become the owner
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uint64 oldPledge; // Points to the id that this Pledge was derived from
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PledgeState pledgeState; // Pledged, Paying, Paid
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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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LPVault public vault;
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/// @dev this mapping allows you to search for a specific pledge's
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/// index number by the hash of that pledge
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mapping (bytes32 => uint64) hPledge2idx;
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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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/// @dev The `vault`is the only addresses that can call a function with this
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/// modifier
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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 `LiquidPledgingBase` on the blockchain
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/// @param _vault The vault where the ETH backing the pledges is stored
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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 = LPVault(_vault); // Assigns the specified vault
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}
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/////////////////////////
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// PledgeAdmin functions
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/////////////////////////
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/// @notice Creates a Giver Admin with the `msg.sender` as the Admin address
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/// @param name The name used to identify the Giver
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/// @param url The link to the Giver's profile often an IPFS hash
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/// @param commitTime The length of time in seconds the Giver has to
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/// veto when the Giver's delegates Pledge funds to a project
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/// @param plugin This is Giver's liquid pledge plugin allowing for
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/// extended functionality
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/// @return idGiver The id number used to reference this Admin
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function addGiver(
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string name,
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string url,
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uint64 commitTime,
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ILiquidPledgingPlugin plugin
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) returns (uint64 idGiver) {
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require(isValidPlugin(plugin)); // Plugin check
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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 Updates a Giver's info to change the address, name, url, or
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/// commitTime, it cannot be used to change a plugin, and it must be called
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/// by the current address of the Giver
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/// @param idGiver This is the Admin id number used to specify the Giver
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/// @param newAddr The new address that represents this Giver
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/// @param newName The new name used to identify the Giver
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/// @param newUrl The new link to the Giver's profile often an IPFS hash
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/// @param newCommitTime Sets the length of time in seconds the Giver has to
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/// veto when the Giver's delegates Pledge funds to a project
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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 send 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 Delegate Admin with the `msg.sender` as the Admin addr
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/// @param name The name used to identify the Delegate
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/// @param url The link to the Delegate's profile often an IPFS hash
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/// @param commitTime Sets the length of time in seconds that this delegate
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/// can be vetoed. Whenever this delegate is in a delegate chain the time
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/// allowed to veto any event must be greater than or equal to this time.
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/// @param plugin This is Delegate's liquid pledge plugin allowing for
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/// extended functionality
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/// @return idxDelegate The id number used to reference this Delegate within
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/// the admins array
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function addDelegate(
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string name,
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string url,
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uint64 commitTime,
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ILiquidPledgingPlugin plugin
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) returns (uint64 idDelegate) {
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require(isValidPlugin(plugin)); // Plugin check
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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 Updates a Delegate's info to change the address, name, url, or
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/// commitTime, it cannot be used to change a plugin, and it must be called
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/// by the current address of the Delegate
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/// @param idDelegate The Admin id number used to specify the Delegate
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/// @param newAddr The new address that represents this Delegate
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/// @param newName The new name used to identify the Delegate
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/// @param newUrl The new link to the Delegate's profile often an IPFS hash
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/// @param newCommitTime Sets the length of time in seconds that this
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/// delegate can be vetoed. Whenever this delegate is in a delegate chain
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/// the time allowed to veto any event must be greater than or equal to
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/// this time.
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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);// Current addr had to send this tx
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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 Project Admin with the `msg.sender` as the Admin addr
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/// @param name The name used to identify the Project
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/// @param url The link to the Project's profile often an IPFS hash
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/// @param projectAdmin The address for the trusted project manager
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/// @param parentProject The Admin id number for the parent project or 0 if
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/// there is no parentProject
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/// @param commitTime Sets the length of time in seconds the Project has to
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/// veto when the Project delegates to another Delegate and they pledge
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/// those funds to a project
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/// @param plugin This is Project's liquid pledge plugin allowing for
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/// extended functionality
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/// @return idProject The id number used to reference this Admin
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function addProject(
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string name,
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string url,
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address projectAdmin,
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uint64 parentProject,
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uint64 commitTime,
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ILiquidPledgingPlugin plugin
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) 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 Updates a Project's info to change the address, name, url, or
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/// commitTime, it cannot be used to change a plugin or a parentProject,
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/// and it must be called by the current address of the Project
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/// @param idProject The Admin id number used to specify the Project
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/// @param newAddr The new address that represents this Project
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/// @param newName The new name used to identify the Project
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/// @param newUrl The new link to the Project's profile often an IPFS hash
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/// @param newCommitTime Sets the length of time in seconds the Project has
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/// to veto when the Project delegates to a Delegate and they pledge those
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/// funds to a 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 A constant getter that returns the total number of pledges
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/// @return The total number of Pledges 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 A getter that returns the details of the specified pledge
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/// @param idPledge the id number of the pledge being queried
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/// @return the amount, owner, the number of delegates (but not the actual
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/// delegates, the intendedProject (if any), the current commit time and
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/// the previous pledge this pledge was derived from
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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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PledgeState pledgeState
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) {
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Pledge storage p = findPledge(idPledge);
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amount = p.amount;
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owner = p.owner;
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nDelegates = uint64(p.delegationChain.length);
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intendedProject = p.intendedProject;
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commitTime = p.commitTime;
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oldPledge = p.oldPledge;
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pledgeState = p.pledgeState;
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}
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/// @notice Getter to find Delegate w/ the Pledge ID & the Delegate index
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/// @param idPledge The id number representing the pledge being queried
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/// @param idxDelegate The index number for the delegate in this Pledge
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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 p = findPledge(idPledge);
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idDelegate = p.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 A constant getter used to check how many total Admins exist
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/// @return The total number of admins (Givers, Delegates and Projects) .
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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 A constant getter to check the details of a specified Admin
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/// @return addr Account or contract address for admin
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/// @return name Name of the pledgeAdmin
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/// @return url The link to the Project's profile often an IPFS hash
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/// @return commitTime The length of time in seconds the Admin has to veto
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/// when the Admin delegates to a Delegate and that Delegate pledges those
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/// funds to a project
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/// @return parentProject The Admin id number for the parent project or 0
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/// if there is no parentProject
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/// @return canceled 0 for Delegates & Givers, true if a Project has been
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/// canceled
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/// @return plugin This is Project's liquidPledging plugin allowing for
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/// extended functionality
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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 This creates a Pledge with an initial amount of 0 if one is not
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/// created already; otherwise it finds the pledge with the specified
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/// attributes; all pledges technically exist, if the pledge hasn't been
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/// created in this system yet it simply isn't in the hash array
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/// hPledge2idx[] yet
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/// @param owner The owner of the pledge being looked up
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/// @param delegationChain The list of delegates in order of authority
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/// @param intendedProject The project this pledge will Fund after the
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/// commitTime has passed
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/// @param commitTime The length of time in seconds the Giver has to
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/// veto when the Giver's delegates Pledge funds to a project
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/// @param oldPledge This value is used to store the pledge the current
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/// pledge was came from, and in the case a Project is canceled, the Pledge
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/// will revert back to it's previous state
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/// @param state The pledge state: Pledged, Paying, or state
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/// @return The hPledge2idx index number
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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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PledgeState state
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) internal returns (uint64)
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{
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bytes32 hPledge = sha3(
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owner, delegationChain, intendedProject, commitTime, oldPledge, state);
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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(
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0, owner, delegationChain, intendedProject, commitTime, oldPledge, state));
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return idx;
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}
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/// @notice A getter to look up a Admin's details
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/// @param idAdmin The id for the Admin to lookup
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/// @return The PledgeAdmin struct for the specified Admin
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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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/// @notice A getter to look up a Pledge's details
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/// @param idPledge The id for the Pledge to lookup
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/// @return The PledgeA struct for the specified Pledge
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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 when a delegate is requested that is not in the system
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uint64 constant NOTFOUND = 0xFFFFFFFFFFFFFFFF;
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/// @notice A getter that searches the delegationChain for the level of
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/// authority a specific delegate has within a Pledge
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/// @param p The Pledge that will be searched
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/// @param idDelegate The specified delegate that's searched for
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/// @return If the delegate chain contains the delegate with the
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/// `admins` array index `idDelegate` this returns that delegates
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/// corresponding index in the delegationChain. Otherwise it returns
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/// the NOTFOUND constant
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function getDelegateIdx(Pledge p, uint64 idDelegate) internal returns(uint64) {
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for (uint i=0; i < p.delegationChain.length; i++) {
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if (p.delegationChain[i] == idDelegate) return uint64(i);
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}
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return NOTFOUND;
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}
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/// @notice A getter to find how many old "parent" pledges a specific Pledge
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/// had using a self-referential loop
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/// @param p The Pledge being queried
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/// @return The number of old "parent" pledges a specific Pledge had
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function getPledgeLevel(Pledge p) internal returns(uint) {
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if (p.oldPledge == 0) return 0;
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Pledge storage oldN = findPledge(p.oldPledge);
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return getPledgeLevel(oldN) + 1; // a loop lookup
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}
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/// @notice A getter to find the longest commitTime out of the owner and all
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/// the delegates for a specified pledge
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/// @param p The Pledge being queried
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/// @return The maximum commitTime out of the owner and all the delegates
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function maxCommitTime(Pledge p) internal returns(uint commitTime) {
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PledgeAdmin storage m = findAdmin(p.owner);
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commitTime = m.commitTime; // start with the owner's commitTime
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for (uint i=0; i<p.delegationChain.length; i++) {
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m = findAdmin(p.delegationChain[i]);
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// If a delegate's commitTime is longer, make it the new commitTime
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if (m.commitTime > commitTime) commitTime = m.commitTime;
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}
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}
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/// @notice A getter to find the level of authority a specific Project has
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/// using a self-referential loop
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/// @param m The Project being queried
|
|
/// @return The level of authority a specific Project has
|
|
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);
|
|
}
|
|
|
|
/// @notice A getter to find if a specified Project has been canceled
|
|
/// @param projectId The Admin id number used to specify the Project
|
|
/// @return True if the Project has been canceled
|
|
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 getter to find the oldest pledge that hasn't been canceled
|
|
/// @param idPledge The starting place to lookup the pledges
|
|
/// @return The oldest idPledge that hasn't been canceled (DUH!)
|
|
function getOldestPledgeNotCanceled(uint64 idPledge
|
|
) internal constant returns(uint64) {
|
|
if (idPledge == 0) return 0;
|
|
Pledge storage p = findPledge(idPledge);
|
|
PledgeAdmin storage admin = findAdmin(p.owner);
|
|
if (admin.adminType == PledgeAdminType.Giver) return idPledge;
|
|
|
|
assert(admin.adminType == PledgeAdminType.Project);
|
|
|
|
if (!isProjectCanceled(p.owner)) return idPledge;
|
|
|
|
return getOldestPledgeNotCanceled(p.oldPledge);
|
|
}
|
|
|
|
/// @notice A check to see if the msg.sender is the owner or the
|
|
/// plugin contract for a specific Admin
|
|
/// @param m The Admin being checked
|
|
function checkAdminOwner(PledgeAdmin m) internal constant {
|
|
require((msg.sender == m.addr) || (msg.sender == address(m.plugin)));
|
|
}
|
|
///////////////////////////
|
|
// Plugin Whitelist Methods
|
|
///////////////////////////
|
|
|
|
function addValidPlugin(bytes32 contractHash) external onlyOwner {
|
|
pluginWhitelist[contractHash] = true;
|
|
}
|
|
|
|
function removeValidPlugin(bytes32 contractHash) external onlyOwner {
|
|
pluginWhitelist[contractHash] = false;
|
|
}
|
|
|
|
function useWhitelist(bool useWhitelist) external onlyOwner {
|
|
usePluginWhitelist = useWhitelist;
|
|
}
|
|
|
|
function isValidPlugin(address addr) public returns(bool) {
|
|
if (!usePluginWhitelist || addr == 0x0) return true;
|
|
|
|
bytes32 contractHash = getCodeHash(addr);
|
|
|
|
return pluginWhitelist[contractHash];
|
|
}
|
|
|
|
function getCodeHash(address addr) public returns(bytes32) {
|
|
bytes memory o_code;
|
|
assembly {
|
|
// retrieve the size of the code, this needs assembly
|
|
let size := extcodesize(addr)
|
|
// allocate output byte array - this could also be done without assembly
|
|
// by using o_code = new bytes(size)
|
|
o_code := mload(0x40)
|
|
// new "memory end" including padding
|
|
mstore(0x40, add(o_code, and(add(add(size, 0x20), 0x1f), not(0x1f))))
|
|
// store length in memory
|
|
mstore(o_code, size)
|
|
// actually retrieve the code, this needs assembly
|
|
extcodecopy(addr, add(o_code, 0x20), 0, size)
|
|
}
|
|
return keccak256(o_code);
|
|
}
|
|
}
|