Address Details
contract
0xdDB915f2bA8bc379ed4f53c462eE7Ccb07F7Ce39
- Contract Name
- ERC20BalanceTier
- Creator
- 0xcf75a4–c85a96 at 0x95db87–5e7314
- Balance
- ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 0 Transactions
- Transfers
- 0 Transfers
- Gas Used
- Fetching gas used...
- Last Balance Update
- 12373308
This contract has been verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- ERC20BalanceTier
- Optimization enabled
- true
- Compiler version
- v0.8.10+commit.fc410830
- Optimization runs
- 100000
- EVM Version
- london
- Verified at
- 2023-02-14T17:19:51.499982Z
contracts/tier/ERC20BalanceTier.sol
// SPDX-License-Identifier: CAL pragma solidity =0.8.10; import "@openzeppelin/contracts/proxy/utils/Initializable.sol"; import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; //solhint-disable-next-line max-line-length import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import {TierConstants} from "./libraries/TierConstants.sol"; import {ValueTier} from "./ValueTier.sol"; import {ITier} from "./ITier.sol"; import "./ReadOnlyTier.sol"; /// Constructor config for ERC20BalanceTier. /// @param erc20 The erc20 token contract to check the balance of at `report` /// time. /// @param tierValues 8 values corresponding to minimum erc20 balances for /// tier 1 through tier 8. struct ERC20BalanceTierConfig { IERC20 erc20; uint256[8] tierValues; } /// @title ERC20BalanceTier /// @notice `ERC20BalanceTier` inherits from `ReadOnlyTier`. /// /// There is no internal accounting, the balance tier simply reads the balance /// of the user whenever `report` is called. /// /// `setTier` always fails. /// /// There is no historical information so each tier will either be `0x00000000` /// or `0xFFFFFFFF` for the block number. /// /// @dev The `ERC20BalanceTier` simply checks the current balance of an erc20 /// against tier values. As the current balance is always read from the erc20 /// contract directly there is no historical block data. /// All tiers held at the current value will be `0x00000000` and tiers not held /// will be `0xFFFFFFFF`. /// `setTier` will error as this contract has no ability to write to the erc20 /// contract state. /// /// IMPORTANT: Simply checking the balance of an unrestricted token is /// typically INSECURE. If users can transfer tokens freely they can use it /// to exploit claim, access, voting, etc. by serially granting many accounts /// some tier simply by transferring or flash-loaning tokens underneath. /// `ERC20TransferTier` can be used as a partial solution to this problem. /// See https://github.com/beehive-innovation/rain-protocol/issues/252 /// /// Balance tiers are useful for: /// - Claim contracts that don't require backdated tier holding /// (be wary of griefing!). /// - Assets that cannot be transferred, so are not eligible for /// `ERC20TransferTier`. /// - Lightweight, realtime checks that encumber the tiered address /// as little as possible. contract ERC20BalanceTier is ReadOnlyTier, ValueTier, Initializable { /// Result of initialize. /// @param sender `msg.sender` of the initialize. /// @param erc20 erc20 token to check balance of. event Initialize(address sender, address erc20); /// The erc20 to check balances against. IERC20 internal erc20; /// @param config_ Initialize config. function initialize(ERC20BalanceTierConfig memory config_) external initializer { initializeValueTier(config_.tierValues); erc20 = config_.erc20; emit Initialize(msg.sender, address(config_.erc20)); } /// Report simply truncates all tiers above the highest value held. /// @inheritdoc ITier function report(address account_) public view override returns (uint256) { return TierReport.truncateTiersAbove( TierConstants.ALWAYS, valueToTier(tierValues(), erc20.balanceOf(account_)) ); } }
/_openzeppelin/contracts/proxy/utils/Initializable.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (proxy/utils/Initializable.sol) pragma solidity ^0.8.0; import "../../utils/Address.sol"; /** * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect. * * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}. * * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity. * * [CAUTION] * ==== * Avoid leaving a contract uninitialized. * * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation * contract, which may impact the proxy. To initialize the implementation contract, you can either invoke the * initializer manually, or you can include a constructor to automatically mark it as initialized when it is deployed: * * [.hljs-theme-light.nopadding] * ``` * /// @custom:oz-upgrades-unsafe-allow constructor * constructor() initializer {} * ``` * ==== */ abstract contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private _initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private _initializing; /** * @dev Modifier to protect an initializer function from being invoked twice. */ modifier initializer() { // If the contract is initializing we ignore whether _initialized is set in order to support multiple // inheritance patterns, but we only do this in the context of a constructor, because in other contexts the // contract may have been reentered. require(_initializing ? _isConstructor() : !_initialized, "Initializable: contract is already initialized"); bool isTopLevelCall = !_initializing; if (isTopLevelCall) { _initializing = true; _initialized = true; } _; if (isTopLevelCall) { _initializing = false; } } /** * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the * {initializer} modifier, directly or indirectly. */ modifier onlyInitializing() { require(_initializing, "Initializable: contract is not initializing"); _; } function _isConstructor() private view returns (bool) { return !Address.isContract(address(this)); } }
/_openzeppelin/contracts/token/ERC20/IERC20.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `from` to `to` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom( address from, address to, uint256 amount ) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
/_openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
/_openzeppelin/contracts/utils/Address.sol
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
/contracts/sstore2/SSTORE2.sol
// SPDX-License-Identifier: MIT pragma solidity =0.8.10; import "./utils/Bytecode.sol"; /** @title A key-value storage with auto-generated keys for storing chunks of data with a lower write & read cost. @author Agustin Aguilar <aa@horizon.io> Readme: https://github.com/0xsequence/sstore2#readme */ library SSTORE2 { error WriteError(); /** @notice Stores `_data` and returns `pointer` as key for later retrieval @dev The pointer is a contract address with `_data` as code @param _data to be written @return pointer Pointer to the written `_data` */ function write(bytes memory _data) internal returns (address pointer) { // Append 00 to _data so contract can't be called // Build init code bytes memory code = Bytecode.creationCodeFor( abi.encodePacked(hex"00", _data) ); // Deploy contract using create assembly { pointer := create(0, add(code, 32), mload(code)) } // Address MUST be non-zero if (pointer == address(0)) revert WriteError(); } /** @notice Reads the contents of the `_pointer` code as data, skips the first byte @dev The function is intended for reading pointers generated by `write` @param _pointer to be read @return data read from `_pointer` contract */ function read(address _pointer) internal view returns (bytes memory) { return Bytecode.codeAt(_pointer, 1, type(uint256).max); } /** @notice Reads the contents of the `_pointer` code as data, skips the first byte @dev The function is intended for reading pointers generated by `write` @param _pointer to be read @param _start number of bytes to skip @return data read from `_pointer` contract */ function read(address _pointer, uint256 _start) internal view returns (bytes memory) { return Bytecode.codeAt(_pointer, _start + 1, type(uint256).max); } /** @notice Reads the contents of the `_pointer` code as data, skips the first byte @dev The function is intended for reading pointers generated by `write` @param _pointer to be read @param _start number of bytes to skip @param _end index before which to end extraction @return data read from `_pointer` contract */ function read( address _pointer, uint256 _start, uint256 _end ) internal view returns (bytes memory) { return Bytecode.codeAt(_pointer, _start + 1, _end + 1); } }
/contracts/sstore2/utils/Bytecode.sol
// SPDX-License-Identifier: MIT pragma solidity =0.8.10; library Bytecode { error InvalidCodeAtRange(uint256 _size, uint256 _start, uint256 _end); /** @notice Generate a creation code that results on a contract with `_code` as bytecode @param _code The returning value of the resulting `creationCode` @return creationCode (constructor) for new contract */ function creationCodeFor(bytes memory _code) internal pure returns (bytes memory) { /* 0x00 0x63 0x63XXXXXX PUSH4 _code.length size 0x01 0x80 0x80 DUP1 size size 0x02 0x60 0x600e PUSH1 14 14 size size 0x03 0x60 0x6000 PUSH1 00 0 14 size size 0x04 0x39 0x39 CODECOPY size 0x05 0x60 0x6000 PUSH1 00 0 size 0x06 0xf3 0xf3 RETURN <CODE> */ return abi.encodePacked( hex"63", uint32(_code.length), hex"80_60_0E_60_00_39_60_00_F3", _code ); } /** @notice Returns the size of the code on a given address @param _addr Address that may or may not contain code @return size of the code on the given `_addr` */ function codeSize(address _addr) internal view returns (uint256 size) { assembly { size := extcodesize(_addr) } } /** @notice Returns the code of a given address @dev It will fail if `_end < _start` @param _addr Address that may or may not contain code @param _start number of bytes of code to skip on read @param _end index before which to end extraction @return oCode read from `_addr` deployed bytecode Forked: https://gist.github.com/KardanovIR/fe98661df9338c842b4a30306d507fbd */ function codeAt( address _addr, uint256 _start, uint256 _end ) internal view returns (bytes memory oCode) { uint256 csize = codeSize(_addr); if (csize == 0) return bytes(""); if (_start > csize) return bytes(""); if (_end < _start) revert InvalidCodeAtRange(csize, _start, _end); unchecked { uint256 reqSize = _end - _start; uint256 maxSize = csize - _start; uint256 size = maxSize < reqSize ? maxSize : reqSize; assembly { // allocate output byte array - this could also be done without // assembly // by using o_code = new bytes(size) oCode := mload(0x40) // new "memory end" including padding mstore( 0x40, add(oCode, and(add(add(size, 0x20), 0x1f), not(0x1f))) ) // store length in memory mstore(oCode, size) // actually retrieve the code, this needs assembly extcodecopy(_addr, add(oCode, 0x20), _start, size) } } } }
/contracts/tier/ITier.sol
// SPDX-License-Identifier: CAL pragma solidity ^0.8.0; /// @title ITier /// @notice `ITier` is a simple interface that contracts can /// implement to provide membership lists for other contracts. /// /// There are many use-cases for a time-preserving conditional membership list. /// /// Some examples include: /// /// - Self-serve whitelist to participate in fundraising /// - Lists of users who can claim airdrops and perks /// - Pooling resources with implied governance/reward tiers /// - POAP style attendance proofs allowing access to future exclusive events /// /// @dev Standard interface to a tiered membership. /// /// A "membership" can represent many things: /// - Exclusive access. /// - Participation in some event or process. /// - KYC completion. /// - Combination of sub-memberships. /// - Etc. /// /// The high level requirements for a contract implementing `ITier`: /// - MUST represent held tiers as a `uint`. /// - MUST implement `report`. /// - The report is a `uint256` that SHOULD represent the block each tier has /// been continuously held since encoded as `uint32`. /// - The encoded tiers start at `1`; Tier `0` is implied if no tier has ever /// been held. /// - Tier `0` is NOT encoded in the report, it is simply the fallback value. /// - If a tier is lost the block data is erased for that tier and will be /// set if/when the tier is regained to the new block. /// - If a tier is held but the historical block information is not available /// the report MAY return `0x00000000` for all held tiers. /// - Tiers that are lost or have never been held MUST return `0xFFFFFFFF`. /// - SHOULD implement `setTier`. /// - Contracts SHOULD revert with `SET_TIER` error if they cannot /// meaningfully set a tier directly. /// For example a contract that can only derive a membership tier by /// reading the state of an external contract cannot set tiers. /// - Contracts implementing `setTier` SHOULD error with `SET_ZERO_TIER` /// if tier 0 is being set. /// - MUST emit `TierChange` when `setTier` successfully writes a new tier. /// - Contracts that cannot meaningfully set a tier are exempt. /// /// So the four possible states and report values are: /// - Tier is held and block is known: Block is in the report /// - Tier is held but block is NOT known: `0` is in the report /// - Tier is NOT held: `0xFF..` is in the report /// - Tier is unknown: `0xFF..` is in the report interface ITier { /// Every time a tier changes we log start and end tier against the /// account. /// This MAY NOT be emitted if reports are being read from the state of an /// external contract. /// The start tier MAY be lower than the current tier as at the block this /// event is emitted in. /// @param sender The `msg.sender` that authorized the tier change. /// @param account The account changing tier. /// @param startTier The previous tier the account held. /// @param endTier The newly acquired tier the account now holds. /// @param data The associated data for the tier change. event TierChange( address sender, address account, uint256 startTier, uint256 endTier, bytes data ); /// @notice Users can set their own tier by calling `setTier`. /// /// The contract that implements `ITier` is responsible for checking /// eligibility and/or taking actions required to set the tier. /// /// For example, the contract must take/refund any tokens relevant to /// changing the tier. /// /// Obviously the user is responsible for any approvals for this action /// prior to calling `setTier`. /// /// When the tier is changed a `TierChange` event will be emmited as: /// ``` /// event TierChange(address account, uint startTier, uint endTier); /// ``` /// /// The `setTier` function includes arbitrary data as the third /// parameter. This can be used to disambiguate in the case that /// there may be many possible options for a user to achieve some tier. /// /// For example, consider the case where tier 3 can be achieved /// by EITHER locking 1x rare NFT or 3x uncommon NFTs. A user with both /// could use `data` to explicitly state their intent. /// /// NOTE however that _any_ address can call `setTier` for any other /// address. /// /// If you implement `data` or anything that changes state then be very /// careful to avoid griefing attacks. /// /// The `data` parameter can also be ignored by the contract implementing /// `ITier`. For example, ERC20 tokens are fungible so only the balance /// approved by the user is relevant to a tier change. /// /// The `setTier` function SHOULD prevent users from reassigning /// tier 0 to themselves. /// /// The tier 0 status represents never having any status. /// @dev Updates the tier of an account. /// /// The implementing contract is responsible for all checks and state /// changes required to set the tier. For example, taking/refunding /// funds/NFTs etc. /// /// Contracts may disallow directly setting tiers, preferring to derive /// reports from other onchain data. /// In this case they should `revert("SET_TIER");`. /// /// @param account Account to change the tier for. /// @param endTier Tier after the change. /// @param data Arbitrary input to disambiguate ownership /// (e.g. NFTs to lock). function setTier( address account, uint256 endTier, bytes calldata data ) external; /// @notice A tier report is a `uint256` that contains each of the block /// numbers each tier has been held continously since as a `uint32`. /// There are 9 possible tier, starting with tier 0 for `0` offset or /// "never held any tier" then working up through 8x 4 byte offsets to the /// full 256 bits. /// /// Low bits = Lower tier. /// /// In hexadecimal every 8 characters = one tier, starting at tier 8 /// from high bits and working down to tier 1. /// /// `uint32` should be plenty for any blockchain that measures block times /// in seconds, but reconsider if deploying to an environment with /// significantly sub-second block times. /// /// ~135 years of 1 second blocks fit into `uint32`. /// /// `2^8 / (365 * 24 * 60 * 60)` /// /// When a user INCREASES their tier they keep all the block numbers they /// already had, and get new block times for each increased tiers they have /// earned. /// /// When a user DECREASES their tier they return to `0xFFFFFFFF` (never) /// for every tier level they remove, but keep their block numbers for the /// remaining tiers. /// /// GUIs are encouraged to make this dynamic very clear for users as /// round-tripping to a lower status and back is a DESTRUCTIVE operation /// for block times. /// /// The intent is that downstream code can provide additional benefits for /// members who have maintained a certain tier for/since a long time. /// These benefits can be provided by inspecting the report, and by /// on-chain contracts directly, /// rather than needing to work with snapshots etc. /// @dev Returns the earliest block the account has held each tier for /// continuously. /// This is encoded as a uint256 with blocks represented as 8x /// concatenated uint32. /// I.e. Each 4 bytes of the uint256 represents a u32 tier start time. /// The low bits represent low tiers and high bits the high tiers. /// Implementing contracts should return 0xFFFFFFFF for lost and /// never-held tiers. /// /// @param account Account to get the report for. /// @return The report blocks encoded as a uint256. function report(address account) external view returns (uint256); }
/contracts/tier/ReadOnlyTier.sol
// SPDX-License-Identifier: CAL pragma solidity =0.8.10; import {ITier} from "./ITier.sol"; import {TierReport} from "./libraries/TierReport.sol"; /// @title ReadOnlyTier /// @notice `ReadOnlyTier` is a base contract that other contracts /// are expected to inherit. /// /// It does not allow `setStatus` and expects `report` to derive from /// some existing onchain data. /// /// @dev A contract inheriting `ReadOnlyTier` cannot call `setTier`. /// /// `ReadOnlyTier` is abstract because it does not implement `report`. /// The expectation is that `report` will derive tiers from some /// external data source. abstract contract ReadOnlyTier is ITier { /// Always reverts because it is not possible to set a read only tier. /// @inheritdoc ITier function setTier( address, uint256, bytes calldata ) external pure override { revert("SET_TIER"); } }
/contracts/tier/ValueTier.sol
// SPDX-License-Identifier: CAL pragma solidity =0.8.10; import {ITier} from "./ITier.sol"; import "./libraries/TierConstants.sol"; import "../sstore2/SSTORE2.sol"; /// @title ValueTier /// /// @dev A contract that is `ValueTier` expects to derive tiers from explicit /// values. For example an address must send or hold an amount of something to /// reach a given tier. /// Anything with predefined values that map to tiers can be a `ValueTier`. /// /// Note that `ValueTier` does NOT implement `ITier`. /// `ValueTier` does include state however, to track the `tierValues` so is not /// a library. contract ValueTier { /// TODO: Typescript errors on uint256[8] so can't include tierValues here. /// @param sender The `msg.sender` initializing value tier. /// @param pointer Pointer to the uint256[8] values. event InitializeValueTier(address sender, address pointer); /// Pointer to the uint256[8] values. address private tierValuesPointer; /// Set the `tierValues` on construction to be referenced immutably. function initializeValueTier(uint256[8] memory tierValues_) internal { // Reinitialization is a bug. assert(tierValuesPointer == address(0)); unchecked { uint256 accumulator_ = 0; for (uint256 i_ = 0; i_ < 8; i_++) { require( tierValues_[i_] >= accumulator_, "OUT_OF_ORDER_TIER_VALUES" ); accumulator_ = tierValues_[i_]; } } address tierValuesPointer_ = SSTORE2.write(abi.encode(tierValues_)); emit InitializeValueTier(msg.sender, tierValuesPointer_); tierValuesPointer = tierValuesPointer_; } /// Complements the default solidity accessor for `tierValues`. /// Returns all the values in a list rather than requiring an index be /// specified. /// @return tierValues_ The immutable `tierValues`. function tierValues() public view returns (uint256[8] memory tierValues_) { return abi.decode(SSTORE2.read(tierValuesPointer), (uint256[8])); } /// Converts a Tier to the minimum value it requires. /// tier 0 is always value 0 as it is the fallback. /// @param tier_ The Tier to convert to a value. function tierToValue(uint256[8] memory tierValues_, uint256 tier_) internal pure returns (uint256) { unchecked { return tier_ > TierConstants.TIER_ZERO ? tierValues_[tier_ - 1] : 0; } } /// Converts a value to the maximum Tier it qualifies for. /// @param value_ The value to convert to a tier. function valueToTier(uint256[8] memory tierValues_, uint256 value_) internal pure returns (uint256) { for (uint256 i_ = 0; i_ < TierConstants.MAX_TIER; i_++) { if (value_ < tierValues_[i_]) { return i_; } } return TierConstants.MAX_TIER; } }
/contracts/tier/libraries/TierConstants.sol
// SPDX-License-Identifier: CAL pragma solidity =0.8.10; /// @title TierConstants /// @notice Constants for use with tier logic. library TierConstants { /// NEVER is 0xFF.. as it is infinitely in the future. /// NEVER for an entire report. uint256 internal constant NEVER_REPORT = type(uint256).max; /// NEVER for a single tier. uint32 internal constant NEVER_TIER = type(uint32).max; /// Always is 0 as it is the genesis block. /// Tiers can't predate the chain but they can predate an `ITier` contract. uint256 internal constant ALWAYS = 0; /// Account has never held a tier. uint256 internal constant TIER_ZERO = 0; /// Magic number for tier one. uint256 internal constant TIER_ONE = 1; /// Magic number for tier two. uint256 internal constant TIER_TWO = 2; /// Magic number for tier three. uint256 internal constant TIER_THREE = 3; /// Magic number for tier four. uint256 internal constant TIER_FOUR = 4; /// Magic number for tier five. uint256 internal constant TIER_FIVE = 5; /// Magic number for tier six. uint256 internal constant TIER_SIX = 6; /// Magic number for tier seven. uint256 internal constant TIER_SEVEN = 7; /// Magic number for tier eight. uint256 internal constant TIER_EIGHT = 8; /// Maximum tier is `TIER_EIGHT`. uint256 internal constant MAX_TIER = TIER_EIGHT; }
/contracts/tier/libraries/TierReport.sol
// SPDX-License-Identifier: CAL pragma solidity =0.8.10; import {ITier} from "../ITier.sol"; import "./TierConstants.sol"; /// @title TierReport /// @notice `TierReport` implements several pure functions that can be /// used to interface with reports. /// - `tierAtBlockFromReport`: Returns the highest status achieved relative to /// a block number and report. Statuses gained after that block are ignored. /// - `tierBlock`: Returns the block that a given tier has been held /// since according to a report. /// - `truncateTiersAbove`: Resets all the tiers above the reference tier. /// - `updateBlocksForTierRange`: Updates a report with a block /// number for every tier in a range. /// - `updateReportWithTierAtBlock`: Updates a report to a new tier. /// @dev Utilities to consistently read, write and manipulate tiers in reports. /// The low-level bit shifting can be difficult to get right so this /// factors that out. library TierReport { /// Enforce upper limit on tiers so we can do unchecked math. /// @param tier_ The tier to enforce bounds on. modifier maxTier(uint256 tier_) { require(tier_ <= TierConstants.MAX_TIER, "MAX_TIER"); _; } /// Returns the highest tier achieved relative to a block number /// and report. /// /// Note that typically the report will be from the _current_ contract /// state, i.e. `block.number` but not always. Tiers gained after the /// reference block are ignored. /// /// When the `report` comes from a later block than the `blockNumber` this /// means the user must have held the tier continuously from `blockNumber` /// _through_ to the report block. /// I.e. NOT a snapshot. /// /// @param report_ A report as per `ITier`. /// @param blockNumber_ The block number to check the tiers against. /// @return The highest tier held since `blockNumber` as per `report`. function tierAtBlockFromReport(uint256 report_, uint256 blockNumber_) internal pure returns (uint256) { unchecked { for (uint256 i_ = 0; i_ < 8; i_++) { if (uint32(uint256(report_ >> (i_ * 32))) > blockNumber_) { return i_; } } return TierConstants.MAX_TIER; } } /// Returns the block that a given tier has been held since from a report. /// /// The report MUST encode "never" as 0xFFFFFFFF. This ensures /// compatibility with `tierAtBlockFromReport`. /// /// @param report_ The report to read a block number from. /// @param tier_ The Tier to read the block number for. /// @return The block number this has been held since. function tierBlock(uint256 report_, uint256 tier_) internal pure maxTier(tier_) returns (uint256) { unchecked { // ZERO is a special case. Everyone has always been at least ZERO, // since block 0. if (tier_ == 0) { return 0; } uint256 offset_ = (tier_ - 1) * 32; return uint256(uint32(uint256(report_ >> offset_))); } } /// Resets all the tiers above the reference tier to 0xFFFFFFFF. /// /// @param report_ Report to truncate with high bit 1s. /// @param tier_ Tier to truncate above (exclusive). /// @return Truncated report. function truncateTiersAbove(uint256 report_, uint256 tier_) internal pure maxTier(tier_) returns (uint256) { unchecked { uint256 offset_ = tier_ * 32; uint256 mask_ = (TierConstants.NEVER_REPORT >> offset_) << offset_; return report_ | mask_; } } /// Updates a report with a block number for a given tier. /// More gas efficient than `updateBlocksForTierRange` if only a single /// tier is being modified. /// The tier at/above the given tier is updated. E.g. tier `0` will update /// the block for tier `1`. /// @param report_ Report to use as the baseline for the updated report. /// @param tier_ The tier level to update. /// @param blockNumber_ The new block number for `tier_`. function updateBlockAtTier( uint256 report_, uint256 tier_, uint256 blockNumber_ ) internal pure maxTier(tier_) returns (uint256) { unchecked { uint256 offset_ = tier_ * 32; return (report_ & ~uint256(uint256(TierConstants.NEVER_TIER) << offset_)) | uint256(blockNumber_ << offset_); } } /// Updates a report with a block number for every tier in a range. /// /// Does nothing if the end status is equal or less than the start tier. /// @param report_ The report to update. /// @param startTier_ The tier at the start of the range (exclusive). /// @param endTier_ The tier at the end of the range (inclusive). /// @param blockNumber_ The block number to set for every tier in the /// range. /// @return The updated report. function updateBlocksForTierRange( uint256 report_, uint256 startTier_, uint256 endTier_, uint256 blockNumber_ ) internal pure maxTier(endTier_) returns (uint256) { unchecked { uint256 offset_; for (uint256 i_ = startTier_; i_ < endTier_; i_++) { offset_ = i_ * 32; report_ = (report_ & ~uint256( uint256(TierConstants.NEVER_TIER) << offset_ )) | uint256(blockNumber_ << offset_); } return report_; } } /// Updates a report to a new status. /// /// Internally dispatches to `truncateTiersAbove` and /// `updateBlocksForTierRange`. /// The dispatch is based on whether the new tier is above or below the /// current tier. /// The `startTier_` MUST match the result of `tierAtBlockFromReport`. /// It is expected the caller will know the current tier when /// calling this function and need to do other things in the calling scope /// with it. /// /// @param report_ The report to update. /// @param startTier_ The tier to start updating relative to. Data above /// this tier WILL BE LOST so probably should be the current tier. /// @param endTier_ The new highest tier held, at the given block number. /// @param blockNumber_ The block number to update the highest tier to, and /// intermediate tiers from `startTier_`. /// @return The updated report. function updateReportWithTierAtBlock( uint256 report_, uint256 startTier_, uint256 endTier_, uint256 blockNumber_ ) internal pure returns (uint256) { return endTier_ < startTier_ ? truncateTiersAbove(report_, endTier_) : updateBlocksForTierRange( report_, startTier_, endTier_, blockNumber_ ); } }
Contract ABI
[{"type":"error","name":"InvalidCodeAtRange","inputs":[{"type":"uint256","name":"_size","internalType":"uint256"},{"type":"uint256","name":"_start","internalType":"uint256"},{"type":"uint256","name":"_end","internalType":"uint256"}]},{"type":"error","name":"WriteError","inputs":[]},{"type":"event","name":"Initialize","inputs":[{"type":"address","name":"sender","internalType":"address","indexed":false},{"type":"address","name":"erc20","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"InitializeValueTier","inputs":[{"type":"address","name":"sender","internalType":"address","indexed":false},{"type":"address","name":"pointer","internalType":"address","indexed":false}],"anonymous":false},{"type":"event","name":"TierChange","inputs":[{"type":"address","name":"sender","internalType":"address","indexed":false},{"type":"address","name":"account","internalType":"address","indexed":false},{"type":"uint256","name":"startTier","internalType":"uint256","indexed":false},{"type":"uint256","name":"endTier","internalType":"uint256","indexed":false},{"type":"bytes","name":"data","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"initialize","inputs":[{"type":"tuple","name":"config_","internalType":"struct ERC20BalanceTierConfig","components":[{"type":"address","name":"erc20","internalType":"contract IERC20"},{"type":"uint256[8]","name":"tierValues","internalType":"uint256[8]"}]}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"report","inputs":[{"type":"address","name":"account_","internalType":"address"}]},{"type":"function","stateMutability":"pure","outputs":[],"name":"setTier","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"bytes","name":"","internalType":"bytes"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256[8]","name":"tierValues_","internalType":"uint256[8]"}],"name":"tierValues","inputs":[]}]
Contract Creation Code
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