mirror of git://holbrook.no/eth-faucet
Add readme, implement ACL for period checker
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# eth-faucet
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A faucet implementation for ETH gas tokens, implementing the [CIC Faucet](https://git.grassecon.net/cicnet/cic-contracts#faucet) interface.
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## Setup
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Firstly, the faucet contract must be funded before use. It can be funded simply by sending gas tokens to it as a normal transaction.
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Secondly, the amount of gas tokens to emit must be changed using the `setAmount()` method. Only the contract "owner" or a "writer" (see below) may change the amount. The amount can be changed again at any time, until sealed.
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## Usage
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To receive gas tokens from the faucet, the method `giveTo(address)` or `gimme()` is used. The latter will send gas tokens to the address that signed the transaction.
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## Restricting accounts
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Usage of the faucet may be restricted by which addresses can request gas tokens from it.
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The list must be provided by a contract implementing the [CIC ACL](https://git.grassecon.net/cicnet/cic-contracts#acl) interface. The contract to use is defined using the `setRegistry()` method.
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## Restricting usage frequency
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Usage of the faucet may also be restricted by time delay.
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The usage control must be provided by a smart contract implementing the [CIC Throttle](https://git.grassecon.net/cicnet/cic-contracts#throttle) interface. The contract to use is defined using the `setPeriodChecker()` method.
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### Example usage frequency controller
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The `PeriodSimple` contract provided by this repository demonstrates an implementation of the usage frequency restriction.
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Only a single address has access to call the `poke(address)` method. This address is typically the contract providing the resource, and is defined by calling the `setPoker(address)` method.
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The number of seconds that must pass between each usage can be set using `setPeriod()`
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Using `setBalanceThreshold()` a maximum balance can be defined, to disallow use for addresses holding higher balances. (Note that this does not provide any real protection against agents, for example non-custioal wallets, that can forward the gas tokens at will).
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## Sealing the contracts
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The faucet contract implements the [CIC Seal](https://git.grassecon.net/cicnet/cic-contracts#seal) interface to enable sealing the parameters defining its behavior.
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The parameters that can be sealed are:
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- *Registry*, blocking the use of the `setRegistry()` method.
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- *Period checker*, blocking the use of the `setPeriodChecker()` method.
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- *Value*, blocking the use of the `setAmount()` method.
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The PeriodSimple contract does not implement the seal, but may discard ownedship through the [EIP173](https://eips.ethereum.org/EIPS/eip-173) interface, after which no parameters changing behavior can be modified.
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@ -104,4 +104,3 @@ class EthFaucet(Faucet):
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o['params'].append('latest')
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o = j.finalize(o)
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return o
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[metadata]
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name = eth-faucet
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version = 0.3.5
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version = 0.4.0
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description = Gas token gifter with controls from time intervals, amounts and access.
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author = Louis Holbrook
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author_email = dev@holbrook.no
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@ -83,7 +83,7 @@ contract EthFaucet {
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return true;
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}
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(_ok, _result) = periodChecker.call(abi.encodeWithSignature("check(address)", _recipient));
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(_ok, _result) = periodChecker.call(abi.encodeWithSignature("have(address)", _recipient));
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if (!_ok) {
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revert('ERR_PERIOD_BACKEND');
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}
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@ -13,6 +13,9 @@ contract PeriodSimple {
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event PeriodChange(uint256 _value);
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event BalanceThresholdChange(uint256 _value);
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// Implements ERC173
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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
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constructor() {
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owner = msg.sender;
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poker = owner;
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@ -39,7 +42,8 @@ contract PeriodSimple {
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return lastUsed[_subject] + period;
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}
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function check(address _subject) external view returns(bool) {
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//function check(address _subject) external view returns(bool) {
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function have(address _subject) external view returns(bool) {
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if (balanceThreshold > 0 && _subject.balance >= balanceThreshold) {
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return false;
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}
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@ -51,10 +55,36 @@ contract PeriodSimple {
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function poke(address _subject) external returns(bool) {
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require(msg.sender == owner || msg.sender == poker, 'ERR_ACCESS');
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if (!this.check(_subject)) {
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if (!this.have(_subject)) {
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||||
return false;
|
||||
}
|
||||
lastUsed[_subject] = block.timestamp;
|
||||
return true;
|
||||
}
|
||||
|
||||
// Implements EIP173
|
||||
function transferOwnership(address _newOwner) public returns (bool) {
|
||||
address oldOwner;
|
||||
require(msg.sender == owner, 'ERR_AXX');
|
||||
|
||||
oldOwner = owner;
|
||||
owner = _newOwner;
|
||||
|
||||
emit OwnershipTransferred(oldOwner, owner);
|
||||
return true;
|
||||
}
|
||||
|
||||
// Implements ERC165
|
||||
function supportsInterface(bytes4 _sum) public pure returns (bool) {
|
||||
if (_sum == 0x01ffc9a7) { // ERC165
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x9493f8b2) { // ERC173
|
||||
return true;
|
||||
}
|
||||
if (_sum == 0x3ef25013) { // ACL
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue