# DSAuthEvents.sol
View Source: [contracts/TestContracts/DappSys/proxy.sol](../contracts/TestContracts/DappSys/proxy.sol)
**↗ Extends: [DSAuthEvents](DSAuthEvents.md)**
**↘ Derived Contracts: [DSAuth](DSAuth.md), [DSAuthEvents](DSAuthEvents.md), [DSAuthority](DSAuthority.md), [DSNote](DSNote.md), [DSProxy](DSProxy.md), [DSProxyCache](DSProxyCache.md), [DSProxyFactory](DSProxyFactory.md)**
**DSAuthEvents**
## Contract Members
**Constants & Variables**
```js
//public members
contract DSAuthority public authority;
address public owner;
contract DSProxyCache public cache;
mapping(address => bool) public isProxy;
contract DSProxyCache public cache;
//internal members
mapping(bytes32 => address) internal cache;
```
**Events**
```js
event LogSetAuthority(address indexed authority);
event LogSetOwner(address indexed owner);
event LogNote(bytes4 indexed sig, address indexed guy, bytes32 indexed foo, bytes32 indexed bar, uint256 wad, bytes fax);
event Created(address indexed sender, address indexed owner, address proxy, address cache);
```
## Modifiers
- [auth](#auth)
- [note](#note)
### auth
```js
modifier auth() internal
```
### note
```js
modifier note() internal
```
## Functions
- [canCall(address src, address dst, bytes4 sig)](#cancall)
- [constructor()](#constructor)
- [setOwner(address owner_)](#setowner)
- [setAuthority(DSAuthority authority_)](#setauthority)
- [isAuthorized(address src, bytes4 sig)](#isauthorized)
- [constructor(address _cacheAddr)](#constructor)
- [constructor()](#constructor)
- [constructor()](#constructor)
- [execute(bytes _code, bytes _data)](#execute)
- [execute(address _target, bytes _data)](#execute)
- [setCache(address _cacheAddr)](#setcache)
- [build()](#build)
- [build(address owner)](#build)
- [read(bytes _code)](#read)
- [write(bytes _code)](#write)
---
> ### canCall
```solidity
function canCall(address src, address dst, bytes4 sig) public view
returns(bool)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| src | address | |
| dst | address | |
| sig | bytes4 | |
Source Code
```javascript
function canCall(
address src, address dst, bytes4 sig
) virtual public view returns (bool);
```
---
> ### constructor
```solidity
function () public nonpayable
```
Source Code
```javascript
constructor() public {
owner = msg.sender;
emit LogSetOwner(msg.sender);
}
```
---
> ### setOwner
```solidity
function setOwner(address owner_) public nonpayable auth
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| owner_ | address | |
Source Code
```javascript
function setOwner(address owner_)
public
auth
{
owner = owner_;
emit LogSetOwner(owner);
}
```
---
> ### setAuthority
```solidity
function setAuthority(DSAuthority authority_) public nonpayable auth
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| authority_ | DSAuthority | |
Source Code
```javascript
function setAuthority(DSAuthority authority_)
public
auth
{
authority = authority_;
emit LogSetAuthority(address(authority));
}
```
---
> ### isAuthorized
```solidity
function isAuthorized(address src, bytes4 sig) internal view
returns(bool)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| src | address | |
| sig | bytes4 | |
Source Code
```javascript
function isAuthorized(address src, bytes4 sig) internal view returns (bool) {
if (src == address(this)) {
return true;
} else if (src == owner) {
return true;
} else if (authority == DSAuthority(0)) {
return false;
} else {
return authority.canCall(src, address(this), sig);
}
}
```
---
> ### constructor
```solidity
function (address _cacheAddr) public nonpayable
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| _cacheAddr | address | |
Source Code
```javascript
constructor(address _cacheAddr) public {
require(setCache(_cacheAddr));
}
```
---
> ### constructor
```solidity
function () external payable
```
Source Code
```javascript
fallback() external payable {
}
```
---
> ### constructor
```solidity
function () external payable
```
Source Code
```javascript
receive() external payable {
}
```
---
> ### execute
```solidity
function execute(bytes _code, bytes _data) public payable
returns(target address, response bytes32)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| _code | bytes | |
| _data | bytes | |
Source Code
```javascript
function execute(bytes calldata _code, bytes calldata _data)
public
payable
returns (address target, bytes32 response)
{
target = cache.read(_code);
if (target == address(0x0)) {
// deploy contract & store its address in cache
target = cache.write(_code);
}
response = execute(target, _data);
}
```
---
> ### execute
```solidity
function execute(address _target, bytes _data) public payable auth note
returns(response bytes32)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| _target | address | |
| _data | bytes | |
Source Code
```javascript
function execute(address _target, bytes memory _data)
public
auth
note
payable
returns (bytes32 response)
{
require(_target != address(0x0));
// call contract in current context
assembly {
let succeeded := delegatecall(sub(gas(), 5000), _target, add(_data, 0x20), mload(_data), 0, 32)
response := mload(0) // load delegatecall output
switch iszero(succeeded)
case 1 {
// throw if delegatecall failed
revert(0, 0)
}
}
}
```
---
> ### setCache
```solidity
function setCache(address _cacheAddr) internal nonpayable auth note
returns(bool)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| _cacheAddr | address | |
Source Code
```javascript
function setCache(address _cacheAddr)
internal
auth
note
returns (bool)
{
require(_cacheAddr != address(0x0)); // invalid cache address
cache = DSProxyCache(_cacheAddr); // overwrite cache
return true;
}
```
---
> ### build
```solidity
function build() public nonpayable
returns(proxy contract DSProxy)
```
Source Code
```javascript
function build() public returns (DSProxy proxy) {
proxy = build(msg.sender);
}
```
---
> ### build
```solidity
function build(address owner) public nonpayable
returns(proxy contract DSProxy)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| owner | address | |
Source Code
```javascript
function build(address owner) public returns (DSProxy proxy) {
proxy = new DSProxy(address(cache));
emit Created(msg.sender, owner, address(proxy), address(cache));
proxy.setOwner(owner);
isProxy[address(proxy)] = true;
}
```
---
> ### read
```solidity
function read(bytes _code) public view
returns(address)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| _code | bytes | |
Source Code
```javascript
function read(bytes calldata _code) public view returns (address) {
bytes32 hash = keccak256(_code);
return cache[hash];
}
```
---
> ### write
```solidity
function write(bytes _code) public nonpayable
returns(target address)
```
**Arguments**
| Name | Type | Description |
| ------------- |------------- | -----|
| _code | bytes | |
Source Code
```javascript
function write(bytes memory _code) public returns (address target) {
assembly {
target := create(0, add(_code, 0x20), mload(_code))
switch iszero(extcodesize(target))
case 1 {
// throw if contract failed to deploy
revert(0, 0)
}
}
bytes32 hash = keccak256(_code);
cache[hash] = target;
}
```
## Contracts
* [ActivePool](ActivePool.md)
* [ActivePoolStorage](ActivePoolStorage.md)
* [BaseMath](BaseMath.md)
* [BorrowerOperations](BorrowerOperations.md)
* [BorrowerOperationsScript](BorrowerOperationsScript.md)
* [BorrowerOperationsStorage](BorrowerOperationsStorage.md)
* [BorrowerWrappersScript](BorrowerWrappersScript.md)
* [CheckContract](CheckContract.md)
* [CollSurplusPool](CollSurplusPool.md)
* [CollSurplusPoolStorage](CollSurplusPoolStorage.md)
* [console](console.md)
* [Context](Context.md)
* [DefaultPool](DefaultPool.md)
* [DefaultPoolStorage](DefaultPoolStorage.md)
* [DocsCover](DocsCover.md)
* [DSAuth](DSAuth.md)
* [DSAuthEvents](DSAuthEvents.md)
* [DSAuthority](DSAuthority.md)
* [DSNote](DSNote.md)
* [DSProxy](DSProxy.md)
* [DSProxyCache](DSProxyCache.md)
* [DSProxyFactory](DSProxyFactory.md)
* [ERC20](ERC20.md)
* [ETHTransferScript](ETHTransferScript.md)
* [FeeDistributor](FeeDistributor.md)
* [FeeDistributorStorage](FeeDistributorStorage.md)
* [GasPool](GasPool.md)
* [HintHelpers](HintHelpers.md)
* [HintHelpersStorage](HintHelpersStorage.md)
* [IActivePool](IActivePool.md)
* [IBalanceRedirectPresale](IBalanceRedirectPresale.md)
* [IBorrowerOperations](IBorrowerOperations.md)
* [ICollSurplusPool](ICollSurplusPool.md)
* [IDefaultPool](IDefaultPool.md)
* [IERC20](IERC20.md)
* [IERC2612](IERC2612.md)
* [IExternalPriceFeed](IExternalPriceFeed.md)
* [IFeeDistributor](IFeeDistributor.md)
* [IFeeSharingProxy](IFeeSharingProxy.md)
* [ILiquityBase](ILiquityBase.md)
* [ILiquityBaseParams](ILiquityBaseParams.md)
* [IMasset](IMasset.md)
* [IMoCBaseOracle](IMoCBaseOracle.md)
* [Initializable](Initializable.md)
* [IPool](IPool.md)
* [IPriceFeed](IPriceFeed.md)
* [IRSKOracle](IRSKOracle.md)
* [ISortedTroves](ISortedTroves.md)
* [IStabilityPool](IStabilityPool.md)
* [ITroveManager](ITroveManager.md)
* [IWrbtc](IWrbtc.md)
* [IZUSDToken](IZUSDToken.md)
* [LiquityBase](LiquityBase.md)
* [LiquityBaseParams](LiquityBaseParams.md)
* [LiquityMath](LiquityMath.md)
* [LiquitySafeMath128](LiquitySafeMath128.md)
* [MoCMedianizer](MoCMedianizer.md)
* [MultiTroveGetter](MultiTroveGetter.md)
* [MultiTroveGetterStorage](MultiTroveGetterStorage.md)
* [NueToken](NueToken.md)
* [Ownable](Ownable.md)
* [PriceFeed](PriceFeed.md)
* [PriceFeedStorage](PriceFeedStorage.md)
* [ProxiableContract](ProxiableContract.md)
* [ProxiableContract2](ProxiableContract2.md)
* [Proxy](Proxy.md)
* [RskOracle](RskOracle.md)
* [SafeMath](SafeMath.md)
* [SortedTroves](SortedTroves.md)
* [SortedTrovesStorage](SortedTrovesStorage.md)
* [StabilityPool](StabilityPool.md)
* [StabilityPoolScript](StabilityPoolScript.md)
* [StabilityPoolStorage](StabilityPoolStorage.md)
* [Storage](Storage.md)
* [Storage2](Storage2.md)
* [TokenScript](TokenScript.md)
* [TroveManager](TroveManager.md)
* [TroveManagerBase](TroveManagerBase.md)
* [TroveManagerBase1MinuteBootstrap](TroveManagerBase1MinuteBootstrap.md)
* [TroveManagerRedeemOps](TroveManagerRedeemOps.md)
* [TroveManagerScript](TroveManagerScript.md)
* [TroveManagerStorage](TroveManagerStorage.md)
* [UpgradableProxy](UpgradableProxy.md)
* [ZUSDToken](ZUSDToken.md)
* [ZUSDTokenStorage](ZUSDTokenStorage.md)