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•  contract CAVAsset
•    - function __transferWithReference(addr ...
•    - function __transferFromWithReference( ...
•    - function __approve(address _spender, ...
•    - function __process(bytes _data, addre ...
•  contract CAVPlatform
•    - function symbols(uint _idx)
•    - function symbolsCount()
•    - function name(bytes32 _symbol)
•    - function setProxy(address _address, b ...
•    - function isCreated(bytes32 _symbol)
•    - function isOwner(address _owner, byte ...
•    - function owner(bytes32 _symbol)
•    - function totalSupply(bytes32 _symbol)
•    - function balanceOf(address _holder, b ...
•    - function allowance(address _from, add ...
•    - function baseUnit(bytes32 _symbol)
•    - function proxyTransferWithReference(a ...
•    - function proxyTransferFromWithReferen ...
•    - function proxyApprove(address _spende ...
•    - function issueAsset(bytes32 _symbol, ...
•    - function issueAsset(bytes32 _symbol, ...
•    - function reissueAsset(bytes32 _symbol ...
•    - function revokeAsset(bytes32 _symbol, ...
•    - function isReissuable(bytes32 _symbol ...
•    - function changeOwnership(bytes32 _sym ...
•    - function hasAssetRights(address _owne ...
•  contract ERC20Interface
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address _owner)
•    - function transfer(address _to, uint25 ...
•    - function transferFrom(address _from, ...
•    - function approve(address _spender, ui ...
•    - function allowance(address _owner, ad ...
•  contract CAVAssetProxy is ERC20Int ... *
•    - function init(CAVPlatform _platform, ...
•    - function stringToBytes32(string memor ...
•    - function _getAsset()
•    - function totalSupply()
•    - function balanceOf(address _owner)
•    - function allowance(address _from, add ...
•    - function decimals()
•    - function transfer(address _to, uint _ ...
•    - function transferWithReference(addres ...
•    - function _transferWithReference(addre ...
•    - function __transferWithReference(addr ...
•    - function transferFrom(address _from, ...
•    - function __transferFromWithReference( ...
•    - function approve(address _spender, ui ...
•    - function __approve(address _spender, ...
•    - function emitTransfer(address _from, ...
•    - function emitApprove(address _from, a ...
•    - function ()
•    - function getVersionFor(address _sende ...
•    - function getLatestVersion()
•    - function getPendingVersion()
•    - function getPendingVersionTimestamp()
•    - function proposeUpgrade(address _newV ...
•    - function purgeUpgrade()
•    - function commitUpgrade()
•    - function optOut()
•    - function optIn()

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/**
 *Submitted for verification at Etherscan.io on 2018-03-16
*/

pragma solidity ^0.4.11;

// File: contracts/CAVAssetInterface.sol

contract CAVAsset {
    function __transferWithReference(address _to, uint _value, string _reference, address _sender) returns(bool);
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) returns(bool);
    function __approve(address _spender, uint _value, address _sender) returns(bool);
    function __process(bytes _data, address _sender) payable {
        revert();
    }
}

// File: contracts/CAVPlatformInterface.sol

contract CAVPlatform {
    mapping(bytes32 => address) public proxies;
    function symbols(uint _idx) public constant returns (bytes32);
    function symbolsCount() public constant returns (uint);

    function name(bytes32 _symbol) returns(string);
    function setProxy(address _address, bytes32 _symbol) returns(uint errorCode);
    function isCreated(bytes32 _symbol) constant returns(bool);
    function isOwner(address _owner, bytes32 _symbol) returns(bool);
    function owner(bytes32 _symbol) constant returns(address);
    function totalSupply(bytes32 _symbol) returns(uint);
    function balanceOf(address _holder, bytes32 _symbol) returns(uint);
    function allowance(address _from, address _spender, bytes32 _symbol) returns(uint);
    function baseUnit(bytes32 _symbol) returns(uint8);
    function proxyTransferWithReference(address _to, uint _value, bytes32 _symbol, string _reference, address _sender) returns(uint errorCode);
    function proxyTransferFromWithReference(address _from, address _to, uint _value, bytes32 _symbol, string _reference, address _sender) returns(uint errorCode);
    function proxyApprove(address _spender, uint _value, bytes32 _symbol, address _sender) returns(uint errorCode);
    function issueAsset(bytes32 _symbol, uint _value, string _name, string _description, uint8 _baseUnit, bool _isReissuable) returns(uint errorCode);
    function issueAsset(bytes32 _symbol, uint _value, string _name, string _description, uint8 _baseUnit, bool _isReissuable, address _account) returns(uint errorCode);
    function reissueAsset(bytes32 _symbol, uint _value) returns(uint errorCode);
    function revokeAsset(bytes32 _symbol, uint _value) returns(uint errorCode);
    function isReissuable(bytes32 _symbol) returns(bool);
    function changeOwnership(bytes32 _symbol, address _newOwner) returns(uint errorCode);
    function hasAssetRights(address _owner, bytes32 _symbol) public view returns (bool);
}

// File: contracts/ERC20Interface.sol

contract ERC20Interface {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed from, address indexed spender, uint256 value);
    string public symbol;

    function decimals() constant returns (uint8);
    function totalSupply() constant returns (uint256 supply);
    function balanceOf(address _owner) constant returns (uint256 balance);
    function transfer(address _to, uint256 _value) returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success);
    function approve(address _spender, uint256 _value) returns (bool success);
    function allowance(address _owner, address _spender) constant returns (uint256 remaining);
}

// File: contracts/CAVAssetProxy.sol

/**
 * @title CAV Asset Proxy.
 *
 * Proxy implements ERC20 interface and acts as a gateway to a single platform asset.
 * Proxy adds symbol and caller(sender) when forwarding requests to platform.
 * Every request that is made by caller first sent to the specific asset implementation
 * contract, which then calls back to be forwarded onto platform.
 *
 * Calls flow: Caller ->
 *             Proxy.func(...) ->
 *             Asset.__func(..., Caller.address) ->
 *             Proxy.__func(..., Caller.address) ->
 *             Platform.proxyFunc(..., symbol, Caller.address)
 *
 * Asset implementation contract is mutable, but each user have an option to stick with
 * old implementation, through explicit decision made in timely manner, if he doesn't agree
 * with new rules.
 * Each user have a possibility to upgrade to latest asset contract implementation, without the
 * possibility to rollback.
 *
 * Note: all the non constant functions return false instead of throwing in case if state change
 * didn't happen yet.
 */
contract CAVAssetProxy is ERC20Interface {

    // Supports CAVPlatform ability to return error codes from methods
    uint constant OK = 1;

    // Assigned platform, immutable.
    CAVPlatform public platform;

    // Assigned symbol, immutable.
    bytes32 public smbl;

    // Assigned name, immutable.
    string public name;

    string public symbol;

    /**
     * Sets platform address, assigns symbol and name.
     *
     * Can be set only once.
     *
     * @param _platform platform contract address.
     * @param _symbol assigned symbol.
     * @param _name assigned name.
     *
     * @return success.
     */
    function init(CAVPlatform _platform, string _symbol, string _name) returns(bool) {
        if (address(platform) != 0x0) {
            return false;
        }
        platform = _platform;
        symbol = _symbol;
        smbl = stringToBytes32(_symbol);
        name = _name;
        return true;
    }

    function stringToBytes32(string memory source) returns (bytes32 result) {
        assembly {
           result := mload(add(source, 32))
        }
    }

    /**
     * Only platform is allowed to call.
     */
    modifier onlyPlatform() {
        if (msg.sender == address(platform)) {
            _;
        }
    }

    /**
     * Only current asset owner is allowed to call.
     */
    modifier onlyAssetOwner() {
        if (platform.isOwner(msg.sender, smbl)) {
            _;
        }
    }

    /**
     * Returns asset implementation contract for current caller.
     *
     * @return asset implementation contract.
     */
    function _getAsset() internal returns(CAVAsset) {
        return CAVAsset(getVersionFor(msg.sender));
    }

    /**
     * Returns asset total supply.
     *
     * @return asset total supply.
     */
    function totalSupply() constant returns(uint) {
        return platform.totalSupply(smbl);
    }

    /**
     * Returns asset balance for a particular holder.
     *
     * @param _owner holder address.
     *
     * @return holder balance.
     */
    function balanceOf(address _owner) constant returns(uint) {
        return platform.balanceOf(_owner, smbl);
    }

    /**
     * Returns asset allowance from one holder to another.
     *
     * @param _from holder that allowed spending.
     * @param _spender holder that is allowed to spend.
     *
     * @return holder to spender allowance.
     */
    function allowance(address _from, address _spender) constant returns(uint) {
        return platform.allowance(_from, _spender, smbl);
    }

    /**
     * Returns asset decimals.
     *
     * @return asset decimals.
     */
    function decimals() constant returns(uint8) {
        return platform.baseUnit(smbl);
    }

    /**
     * Transfers asset balance from the caller to specified receiver.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transfer(address _to, uint _value) returns(bool) {
        if (_to != 0x0) {
          return _transferWithReference(_to, _value, "");
        }
        else {
            return false;
        }
    }

    /**
     * Transfers asset balance from the caller to specified receiver adding specified comment.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a platform's Transfer event.
     *
     * @return success.
     */
    function transferWithReference(address _to, uint _value, string _reference) returns(bool) {
        if (_to != 0x0) {
            return _transferWithReference(_to, _value, _reference);
        }
        else {
            return false;
        }
    }

    /**
     * Resolves asset implementation contract for the caller and forwards there arguments along with
     * the caller address.
     *
     * @return success.
     */
    function _transferWithReference(address _to, uint _value, string _reference) internal returns(bool) {
        return _getAsset().__transferWithReference(_to, _value, _reference, msg.sender);
    }

    /**
     * Performs transfer call on the platform by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a platform's Transfer event.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function __transferWithReference(address _to, uint _value, string _reference, address _sender) onlyAccess(_sender) returns(bool) {
        return platform.proxyTransferWithReference(_to, _value, smbl, _reference, _sender) == OK;
    }

    /**
     * Prforms allowance transfer of asset balance between holders.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     *
     * @return success.
     */
    function transferFrom(address _from, address _to, uint _value) returns(bool) {
        if (_to != 0x0) {
            return _getAsset().__transferFromWithReference(_from, _to, _value, "", msg.sender);
         }
         else {
             return false;
         }
    }

    /**
     * Performs allowance transfer call on the platform by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _from holder address to take from.
     * @param _to holder address to give to.
     * @param _value amount to transfer.
     * @param _reference transfer comment to be included in a platform's Transfer event.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) onlyAccess(_sender) returns(bool) {
        return platform.proxyTransferFromWithReference(_from, _to, _value, smbl, _reference, _sender) == OK;
    }

    /**
     * Sets asset spending allowance for a specified spender.
     *
     * @param _spender holder address to set allowance to.
     * @param _value amount to allow.
     *
     * @return success.
     */
    function approve(address _spender, uint _value) returns(bool) {
        if (_spender != 0x0) {
             return _getAsset().__approve(_spender, _value, msg.sender);
        }
        else {
            return false;
        }
    }

    /**
     * Performs allowance setting call on the platform by the name of specified sender.
     *
     * Can only be called by asset implementation contract assigned to sender.
     *
     * @param _spender holder address to set allowance to.
     * @param _value amount to allow.
     * @param _sender initial caller.
     *
     * @return success.
     */
    function __approve(address _spender, uint _value, address _sender) onlyAccess(_sender) returns(bool) {
        return platform.proxyApprove(_spender, _value, smbl, _sender) == OK;
    }

    /**
     * Emits ERC20 Transfer event on this contract.
     *
     * Can only be, and, called by assigned platform when asset transfer happens.
     */
    function emitTransfer(address _from, address _to, uint _value) onlyPlatform() {
        Transfer(_from, _to, _value);
    }

    /**
     * Emits ERC20 Approval event on this contract.
     *
     * Can only be, and, called by assigned platform when asset allowance set happens.
     */
    function emitApprove(address _from, address _spender, uint _value) onlyPlatform() {
        Approval(_from, _spender, _value);
    }

    /**
     * Resolves asset implementation contract for the caller and forwards there transaction data,
     * along with the value. This allows for proxy interface growth.
     */
    function () payable {
        _getAsset().__process.value(msg.value)(msg.data, msg.sender);
    }

    /**
     * Indicates an upgrade freeze-time start, and the next asset implementation contract.
     */
    event UpgradeProposal(address newVersion);

    // Current asset implementation contract address.
    address latestVersion;

    // Proposed next asset implementation contract address.
    address pendingVersion;

    // Upgrade freeze-time start.
    uint pendingVersionTimestamp;

    // Timespan for users to review the new implementation and make decision.
    uint constant UPGRADE_FREEZE_TIME = 3 days;

    // Asset implementation contract address that user decided to stick with.
    // 0x0 means that user uses latest version.
    mapping(address => address) userOptOutVersion;

    /**
     * Only asset implementation contract assigned to sender is allowed to call.
     */
    modifier onlyAccess(address _sender) {
        if (getVersionFor(_sender) == msg.sender) {
            _;
        }
    }

    /**
     * Returns asset implementation contract address assigned to sender.
     *
     * @param _sender sender address.
     *
     * @return asset implementation contract address.
     */
    function getVersionFor(address _sender) constant returns(address) {
        return userOptOutVersion[_sender] == 0 ? latestVersion : userOptOutVersion[_sender];
    }

    /**
     * Returns current asset implementation contract address.
     *
     * @return asset implementation contract address.
     */
    function getLatestVersion() constant returns(address) {
        return latestVersion;
    }

    /**
     * Returns proposed next asset implementation contract address.
     *
     * @return asset implementation contract address.
     */
    function getPendingVersion() constant returns(address) {
        return pendingVersion;
    }

    /**
     * Returns upgrade freeze-time start.
     *
     * @return freeze-time start.
     */
    function getPendingVersionTimestamp() constant returns(uint) {
        return pendingVersionTimestamp;
    }

    /**
     * Propose next asset implementation contract address.
     *
     * Can only be called by current asset owner.
     *
     * Note: freeze-time should not be applied for the initial setup.
     *
     * @param _newVersion asset implementation contract address.
     *
     * @return success.
     */
    function proposeUpgrade(address _newVersion) onlyAssetOwner() returns(bool) {
        // Should not already be in the upgrading process.
        if (pendingVersion != 0x0) {
            return false;
        }
        // New version address should be other than 0x0.
        if (_newVersion == 0x0) {
            return false;
        }
        // Don't apply freeze-time for the initial setup.
        if (latestVersion == 0x0) {
            latestVersion = _newVersion;
            return true;
        }
        pendingVersion = _newVersion;
        pendingVersionTimestamp = now;
        UpgradeProposal(_newVersion);
        return true;
    }

    /**
     * Cancel the pending upgrade process.
     *
     * Can only be called by current asset owner.
     *
     * @return success.
     */
    function purgeUpgrade() onlyAssetOwner() returns(bool) {
        if (pendingVersion == 0x0) {
            return false;
        }
        delete pendingVersion;
        delete pendingVersionTimestamp;
        return true;
    }

    /**
     * Finalize an upgrade process setting new asset implementation contract address.
     *
     * Can only be called after an upgrade freeze-time.
     *
     * @return success.
     */
    function commitUpgrade() returns(bool) {
        if (pendingVersion == 0x0) {
            return false;
        }
        if (pendingVersionTimestamp + UPGRADE_FREEZE_TIME > now) {
            return false;
        }
        latestVersion = pendingVersion;
        delete pendingVersion;
        delete pendingVersionTimestamp;
        return true;
    }

    /**
     * Disagree with proposed upgrade, and stick with current asset implementation
     * until further explicit agreement to upgrade.
     *
     * @return success.
     */
    function optOut() returns(bool) {
        if (userOptOutVersion[msg.sender] != 0x0) {
            return false;
        }
        userOptOutVersion[msg.sender] = latestVersion;
        return true;
    }

    /**
     * Implicitly agree to upgrade to current and future asset implementation upgrades,
     * until further explicit disagreement.
     *
     * @return success.
     */
    function optIn() returns(bool) {
        delete userOptOutVersion[msg.sender];
        return true;
    }
}

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