pragma solidity ^0.4.24;

// File: zos-lib/contracts/upgradeability/Proxy.sol

/**

@title Proxy
@dev Implements delegation of calls to other contracts, with proper
forwarding of return values and bubbling of failures.
It defines a fallback function that delegates all calls to the address
returned by the abstract _implementation() internal function.
/
contract Proxy {
/*
- @dev Fallback function.
- Implemented entirely in _fallback.
  */
  function () payable external {
  _fallback();
  }

/**

@return The Address of the implementation.
*/
function _implementation() internal view returns (address);

/**

@dev Delegates execution to an implementation contract.
This is a low level function that doesn't return to its internal call site.
It will return to the external caller whatever the implementation returns.
@param implementation Address to delegate.
*/
function _delegate(address implementation) internal {
assembly {
// Copy msg.data. We take full control of memory in this inline assembly
// block because it will not return to Solidity code. We overwrite the
// Solidity scratch pad at memory position 0.
calldatacopy(0, 0, calldatasize)

// Call the implementation.
// out and outsize are 0 because we don't know the size yet.
let result := delegatecall(gas, implementation, 0, calldatasize, 0, 0)

// Copy the returned data.
returndatacopy(0, 0, returndatasize)

switch result
// delegatecall returns 0 on error.
case 0 { revert(0, returndatasize) }
default { return(0, returndatasize) }
}
}

/**

@dev Function that is run as the first thing in the fallback function.
Can be redefined in derived contracts to add functionality.
Redefinitions must call super._willFallback().
*/
function _willFallback() internal {
}

/**

@dev fallback implementation.
Extracted to enable manual triggering.
*/
function _fallback() internal {
_willFallback();
_delegate(_implementation());
}
}

// File: openzeppelin-solidity/contracts/AddressUtils.sol

/**

Utility library of inline functions on addresses
*/
library AddressUtils {

/**

Returns whether the target address is a contract
@dev This function will return false if invoked during the constructor of a contract,
as the code is not actually created until after the constructor finishes.
@param addr address to check
@return whether the target address is a contract
*/
function isContract(address addr) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.
// See https://ethereum.stackexchange.com/a/14016/36603
// for more details about how this works.
// TODO Check this again before the Serenity release, because all addresses will be
// contracts then.
// solium-disable-next-line security/no-inline-assembly
assembly { size := extcodesize(addr) }
return size > 0;
}

}

// File: zos-lib/contracts/upgradeability/UpgradeabilityProxy.sol

/**

@title UpgradeabilityProxy
@dev This contract implements a proxy that allows to change the
implementation address to which it will delegate.
Such a change is called an implementation upgrade.
/
contract UpgradeabilityProxy is Proxy {
/*
- @dev Emitted when the implementation is upgraded.
- @param implementation Address of the new implementation.
  */
  event Upgraded(address implementation);

/**

@dev Storage slot with the address of the current implementation.
This is the keccak-256 hash of "org.zeppelinos.proxy.implementation", and is
validated in the constructor.
*/
bytes32 private constant IMPLEMENTATION_SLOT = 0x7050c9e0f4ca769c69bd3a8ef740bc37934f8e2c036e5a723fd8ee048ed3f8c3;

/**

@dev Contract constructor.
@param _implementation Address of the initial implementation.
*/
constructor(address _implementation) public {
assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation"));

_setImplementation(_implementation);

}

/**

@dev Returns the current implementation.
@return Address of the current implementation
*/
function _implementation() internal view returns (address impl) {
bytes32 slot = IMPLEMENTATION_SLOT;
assembly {
impl := sload(slot)
}
}

/**

@dev Upgrades the proxy to a new implementation.
@param newImplementation Address of the new implementation.
*/
function _upgradeTo(address newImplementation) internal {
_setImplementation(newImplementation);
emit Upgraded(newImplementation);
}

/**

@dev Sets the implementation address of the proxy.
@param newImplementation Address of the new implementation.
*/
function _setImplementation(address newImplementation) private {
require(AddressUtils.isContract(newImplementation), "Cannot set a proxy implementation to a non-contract address");

bytes32 slot = IMPLEMENTATION_SLOT;

assembly {
  sstore(slot, newImplementation)
}

}
}

// File: zos-lib/contracts/upgradeability/AdminUpgradeabilityProxy.sol

/**

@title AdminUpgradeabilityProxy
@dev This contract combines an upgradeability proxy with an authorization
mechanism for administrative tasks.
All external functions in this contract must be guarded by the
ifAdmin modifier. See Support injecting code before dispatcher execution in a contract argotorg/solidity#3864 for a Solidity
feature proposal that would enable this to be done automatically.
/
contract AdminUpgradeabilityProxy is UpgradeabilityProxy {
/*
- @dev Emitted when the administration has been transferred.
- @param previousAdmin Address of the previous admin.
- @param newAdmin Address of the new admin.
  */
  event AdminChanged(address previousAdmin, address newAdmin);

/**

@dev Storage slot with the admin of the contract.
This is the keccak-256 hash of "org.zeppelinos.proxy.admin", and is
validated in the constructor.
*/
bytes32 private constant ADMIN_SLOT = 0x10d6a54a4754c8869d6886b5f5d7fbfa5b4522237ea5c60d11bc4e7a1ff9390b;

/**

@dev Modifier to check whether the msg.sender is the admin.
If it is, it will run the function. Otherwise, it will delegate the call
to the implementation.
*/
modifier ifAdmin() {
if (msg.sender == _admin()) {
_;
} else {
_fallback();
}
}

/**

Contract constructor.
It sets the msg.sender as the proxy administrator.
@param _implementation address of the initial implementation.
*/
constructor(address _implementation) UpgradeabilityProxy(_implementation) public {
assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin"));

_setAdmin(msg.sender);

}

/**

@return The address of the proxy admin.
*/
function admin() external view ifAdmin returns (address) {
return _admin();
}

/**

@return The address of the implementation.
*/
function implementation() external view ifAdmin returns (address) {
return _implementation();
}

/**

@dev Changes the admin of the proxy.
Only the current admin can call this function.
@param newAdmin Address to transfer proxy administration to.
*/
function changeAdmin(address newAdmin) external ifAdmin {
require(newAdmin != address(0), "Cannot change the admin of a proxy to the zero address");
emit AdminChanged(_admin(), newAdmin);
_setAdmin(newAdmin);
}

/**

@dev Upgrade the backing implementation of the proxy.
Only the admin can call this function.
@param newImplementation Address of the new implementation.
*/
function upgradeTo(address newImplementation) external ifAdmin {
_upgradeTo(newImplementation);
}

/**

@dev Upgrade the backing implementation of the proxy and call a function
on the new implementation.
This is useful to initialize the proxied contract.
@param newImplementation Address of the new implementation.
@param data Data to send as msg.data in the low level call.
It should include the signature and the parameters of the function to be
called, as described in
https://solidity.readthedocs.io/en/develop/abi-spec.html#function-selector-and-argument-encoding.
*/
function upgradeToAndCall(address newImplementation, bytes data) payable external ifAdmin {
_upgradeTo(newImplementation);
require(address(this).call.value(msg.value)(data));
}

/**

@return The admin slot.
*/
function _admin() internal view returns (address adm) {
bytes32 slot = ADMIN_SLOT;
assembly {
adm := sload(slot)
}
}

/**

@dev Sets the address of the proxy admin.
@param newAdmin Address of the new proxy admin.
*/
function _setAdmin(address newAdmin) internal {
bytes32 slot = ADMIN_SLOT;

assembly {
  sstore(slot, newAdmin)
}

}

/**

@dev Only fall back when the sender is not the admin.
*/
function _willFallback() internal {
require(msg.sender != _admin(), "Cannot call fallback function from the proxy admin");
super._willFallback();
}
}

// File: contracts/FiatTokenProxy.sol

/**

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is furnished to
do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

pragma solidity ^0.4.24;

/**

@title FiatTokenProxy
@dev This contract proxies FiatToken calls and enables FiatToken upgrades
*/
contract FiatTokenProxy is AdminUpgradeabilityProxy {
constructor(address _implementation) public AdminUpgradeabilityProxy(_implementation) {
}
}$ git clone git@github.com:centrehq/centre-tokens.git
$ cd centre-tokens
$ npm i -g yarn # Install yarn if you don't already have it
$ yarn install # Install dependencies
$ yarn setup # Setup Git hooks

G a la bat par un negòsi par pôc la pèrd 55qf #3

Description

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions