Contract Source Code (Solidity)

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•  contract AraProxy
•    - function setImplementation(address _n ...
•    - function ()
•  contract AraRegistry *
•    - function getLatestVersionAddress(byte ...
•    - function getUpgradeableContractAddres ...
•    - function addNewUpgradeableContract(by ...
•    - function upgradeContract(bytes32 _con ...
•    - function _deployProxy(bytes32 _contra ...

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/**
 *Submitted for verification at Etherscan.io on 2019-01-30
*/

pragma solidity ^0.4.24;

// File: contracts/AraProxy.sol

/**
 * @title AraProxy
 * @dev Gives the possibility to delegate any call to a foreign implementation.
 */
contract AraProxy {

  bytes32 private constant registryPosition_ = keccak256("io.ara.proxy.registry");
  bytes32 private constant implementationPosition_ = keccak256("io.ara.proxy.implementation");

  modifier restricted() {
    bytes32 registryPosition = registryPosition_;
    address registryAddress;
    assembly {
      registryAddress := sload(registryPosition)
    }
    require(
      msg.sender == registryAddress,
      "Only the AraRegistry can upgrade this proxy."
    );
    _;
  }

  /**
  * @dev the constructor sets the AraRegistry address
  */
  constructor(address _registryAddress, address _implementationAddress) public {
    bytes32 registryPosition = registryPosition_;
    bytes32 implementationPosition = implementationPosition_;
    assembly {
      sstore(registryPosition, _registryAddress)
      sstore(implementationPosition, _implementationAddress)
    }
  }

  function setImplementation(address _newImplementation) public restricted {
    require(_newImplementation != address(0));
    bytes32 implementationPosition = implementationPosition_;
    assembly {
      sstore(implementationPosition, _newImplementation)
    }
  }

  /**
  * @dev Fallback function allowing to perform a delegatecall to the given implementation.
  * This function will return whatever the implementation call returns
  */
  function () payable public {
    bytes32 implementationPosition = implementationPosition_;
    address _impl;
    assembly {
      _impl := sload(implementationPosition)
    }

    assembly {
      let ptr := mload(0x40)
      calldatacopy(ptr, 0, calldatasize)
      let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
      let size := returndatasize
      returndatacopy(ptr, 0, size)

      switch result
      case 0 { revert(ptr, size) }
      default { return(ptr, size) }
    }
  }
}

// File: contracts/AraRegistry.sol

contract AraRegistry {
  address public owner_;
  mapping (bytes32 => UpgradeableContract) private contracts_; // keccak256(contractname) => struct

  struct UpgradeableContract {
    bool initialized_;

    address proxy_;
    string latestVersion_;
    mapping (string => address) versions_;
  }

  event UpgradeableContractAdded(bytes32 _contractName, string _version, address _address);
  event ContractUpgraded(bytes32 _contractName, string _version, address _address);
  event ProxyDeployed(bytes32 _contractName, address _address);

  constructor() public {
    owner_ = msg.sender;
  }

  modifier restricted() {
    require (
      msg.sender == owner_,
      "Sender not authorized."
    );
    _;
  }

  function getLatestVersionAddress(bytes32 _contractName) public view returns (address) {
    return contracts_[_contractName].versions_[contracts_[_contractName].latestVersion_];
  }

  function getUpgradeableContractAddress(bytes32 _contractName, string _version) public view returns (address) {
    return contracts_[_contractName].versions_[_version];
  }

  function addNewUpgradeableContract(bytes32 _contractName, string _version, bytes _code, bytes _data) public restricted {
    require(!contracts_[_contractName].initialized_, "Upgradeable contract already exists. Try upgrading instead.");
    address deployedAddress;
    assembly {
      deployedAddress := create(0, add(_code, 0x20), mload(_code))
    }

    contracts_[_contractName].initialized_ = true;
    contracts_[_contractName].latestVersion_ = _version;
    contracts_[_contractName].versions_[_version] = deployedAddress;
    _deployProxy(_contractName, deployedAddress, _data);

    emit UpgradeableContractAdded(_contractName, _version, deployedAddress);
  }

  function upgradeContract(bytes32 _contractName, string _version, bytes _code) public restricted {
    require(contracts_[_contractName].initialized_, "Upgradeable contract must exist before it can be upgraded. Try adding one instead.");
    address deployedAddress;
    assembly {
      deployedAddress := create(0, add(_code, 0x20), mload(_code))
    }

    AraProxy proxy = AraProxy(contracts_[_contractName].proxy_);
    proxy.setImplementation(deployedAddress);

    contracts_[_contractName].latestVersion_ = _version;
    contracts_[_contractName].versions_[_version] = deployedAddress;

    emit ContractUpgraded(_contractName, _version, deployedAddress);
  }

  function _deployProxy(bytes32 _contractName, address _implementationAddress, bytes _data) private {
    require(contracts_[_contractName].proxy_ == address(0), "Only one proxy can exist per upgradeable contract.");
    AraProxy proxy = new AraProxy(address(this), _implementationAddress);
    require(address(proxy).call(abi.encodeWithSignature("init(bytes)", _data)), "Init failed.");
    contracts_[_contractName].proxy_ = proxy;

    emit ProxyDeployed(_contractName, proxy);
  }
}

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[{"constant":false,"inputs":[{"name":"_contractName","type":"bytes32"},{"name":"_version","type":"string"},{"name":"_code","type":"bytes"},{"name":"_data","type":"bytes"}],"name":"addNewUpgradeableContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_contractName","type":"bytes32"}],"name":"getLatestVersionAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_contractName","type":"bytes32"},{"name":"_version","type":"string"},{"name":"_code","type":"bytes"}],"name":"upgradeContract","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner_","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_contractName","type":"bytes32"},{"name":"_version","type":"string"}],"name":"getUpgradeableContractAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_contractName","type":"bytes32"},{"indexed":false,"name":"_version","type":"string"},{"indexed":false,"name":"_address","type":"address"}],"name":"UpgradeableContractAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_contractName","type":"bytes32"},{"indexed":false,"name":"_version","type":"string"},{"indexed":false,"name":"_address","type":"address"}],"name":"ContractUpgraded","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_contractName","type":"bytes32"},{"indexed":false,"name":"_address","type":"address"}],"name":"ProxyDeployed","type":"event"}]

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