ERC-721
NFT
Overview
Max Total Supply
36,283 The Proof of Attendance Protocol
Holders
22,647
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
Balance
7 The Proof of Attendance ProtocolLoading...
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0x9b81a139...d215cF8eA The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
AdminUpgradeabilityProxy
Compiler Version
v0.4.24+commit.e67f0147
Optimization Enabled:
No with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2019-05-22 */ /** * @title ImplementationProvider * @dev Interface for providing implementation addresses for other contracts by name. */ interface ImplementationProvider { /** * @dev Abstract function to return the implementation address of a contract. * @param contractName Name of the contract. * @return Implementation address of the contract. */ function getImplementation(string contractName) public view returns (address); } // File: zos-lib/contracts/ownership/Ownable.sol /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". * * Source: https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/v2.0.0/contracts/ownership/Ownable.sol * This contract is copied here and renamed from the original to avoid clashes in the compiled artifacts * when the user imports a zos-lib contract (that transitively causes this contract to be compiled and added to the * build/artifacts folder) as well as the vanilla Ownable implementation from an openzeppelin version. */ contract ZOSLibOwnable { address private _owner; event OwnershipTransferred( address indexed previousOwner, address indexed newOwner ); /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ constructor() internal { _owner = msg.sender; emit OwnershipTransferred(address(0), _owner); } /** * @return the address of the owner. */ function owner() public view returns(address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(isOwner()); _; } /** * @return true if `msg.sender` is the owner of the contract. */ function isOwner() public view returns(bool) { return msg.sender == _owner; } /** * @dev Allows the current owner to relinquish control of the contract. * @notice Renouncing to ownership will leave the contract without an owner. * It will not be possible to call the functions with the `onlyOwner` * modifier anymore. */ function renounceOwnership() public onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) public onlyOwner { _transferOwnership(newOwner); } /** * @dev Transfers control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function _transferOwnership(address newOwner) internal { require(newOwner != address(0)); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } } // File: zos-lib/contracts/application/Package.sol /** * @title Package * @dev A package is composed by a set of versions, identified via semantic versioning, * where each version has a contract address that refers to a reusable implementation, * plus an optional content URI with metadata. Note that the semver identifier is restricted * to major, minor, and patch, as prerelease tags are not supported. */ contract Package is ZOSLibOwnable { /** * @dev Emitted when a version is added to the package. * @param semanticVersion Name of the added version. * @param contractAddress Contract associated with the version. * @param contentURI Optional content URI with metadata of the version. */ event VersionAdded(uint64[3] semanticVersion, address contractAddress, bytes contentURI); struct Version { uint64[3] semanticVersion; address contractAddress; bytes contentURI; } mapping (bytes32 => Version) internal versions; mapping (uint64 => bytes32) internal majorToLatestVersion; uint64 internal latestMajor; /** * @dev Returns a version given its semver identifier. * @param semanticVersion Semver identifier of the version. * @return Contract address and content URI for the version, or zero if not exists. */ function getVersion(uint64[3] semanticVersion) public view returns (address contractAddress, bytes contentURI) { Version storage version = versions[semanticVersionHash(semanticVersion)]; return (version.contractAddress, version.contentURI); } /** * @dev Returns a contract for a version given its semver identifier. * This method is equivalent to `getVersion`, but returns only the contract address. * @param semanticVersion Semver identifier of the version. * @return Contract address for the version, or zero if not exists. */ function getContract(uint64[3] semanticVersion) public view returns (address contractAddress) { Version storage version = versions[semanticVersionHash(semanticVersion)]; return version.contractAddress; } /** * @dev Adds a new version to the package. Only the Owner can add new versions. * Reverts if the specified semver identifier already exists. * Emits a `VersionAdded` event if successful. * @param semanticVersion Semver identifier of the version. * @param contractAddress Contract address for the version, must be non-zero. * @param contentURI Optional content URI for the version. */ function addVersion(uint64[3] semanticVersion, address contractAddress, bytes contentURI) public onlyOwner { require(contractAddress != address(0), "Contract address is required"); require(!hasVersion(semanticVersion), "Given version is already registered in package"); require(!semanticVersionIsZero(semanticVersion), "Version must be non zero"); // Register version bytes32 versionId = semanticVersionHash(semanticVersion); versions[versionId] = Version(semanticVersion, contractAddress, contentURI); // Update latest major uint64 major = semanticVersion[0]; if (major > latestMajor) { latestMajor = semanticVersion[0]; } // Update latest version for this major uint64 minor = semanticVersion[1]; uint64 patch = semanticVersion[2]; uint64[3] latestVersionForMajor = versions[majorToLatestVersion[major]].semanticVersion; if (semanticVersionIsZero(latestVersionForMajor) // No latest was set for this major || (minor > latestVersionForMajor[1]) // Or current minor is greater || (minor == latestVersionForMajor[1] && patch > latestVersionForMajor[2]) // Or current patch is greater ) { majorToLatestVersion[major] = versionId; } emit VersionAdded(semanticVersion, contractAddress, contentURI); } /** * @dev Checks whether a version is present in the package. * @param semanticVersion Semver identifier of the version. * @return true if the version is registered in this package, false otherwise. */ function hasVersion(uint64[3] semanticVersion) public view returns (bool) { Version storage version = versions[semanticVersionHash(semanticVersion)]; return address(version.contractAddress) != address(0); } /** * @dev Returns the version with the highest semver identifier registered in the package. * For instance, if `1.2.0`, `1.3.0`, and `2.0.0` are present, will always return `2.0.0`, regardless * of the order in which they were registered. Returns zero if no versions are registered. * @return Semver identifier, contract address, and content URI for the version, or zero if not exists. */ function getLatest() public view returns (uint64[3] semanticVersion, address contractAddress, bytes contentURI) { return getLatestByMajor(latestMajor); } /** * @dev Returns the version with the highest semver identifier for the given major. * For instance, if `1.2.0`, `1.3.0`, and `2.0.0` are present, will return `1.3.0` for major `1`, * regardless of the order in which they were registered. Returns zero if no versions are registered * for the specified major. * @param major Major identifier to query * @return Semver identifier, contract address, and content URI for the version, or zero if not exists. */ function getLatestByMajor(uint64 major) public view returns (uint64[3] semanticVersion, address contractAddress, bytes contentURI) { Version storage version = versions[majorToLatestVersion[major]]; return (version.semanticVersion, version.contractAddress, version.contentURI); } function semanticVersionHash(uint64[3] version) internal pure returns (bytes32) { return keccak256(abi.encodePacked(version[0], version[1], version[2])); } function semanticVersionIsZero(uint64[3] version) internal pure returns (bool) { return version[0] == 0 && version[1] == 0 && version[2] == 0; } } // 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: zos-lib/contracts/utils/Address.sol /** * Utility library of inline functions on addresses * * Source https://raw.githubusercontent.com/OpenZeppelin/openzeppelin-solidity/v2.0.0/contracts/utils/Address.sol * This contract is copied here and renamed from the original to avoid clashes in the compiled artifacts * when the user imports a zos-lib contract (that transitively causes this contract to be compiled and added to the * build/artifacts folder) as well as the vanilla Address implementation from an openzeppelin version. */ library ZOSLibAddress { /** * 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 account address of the account to check * @return whether the target address is a contract */ function isContract(address account) 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(account) } 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 indexed 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. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ constructor(address _implementation, bytes _data) public payable { assert(IMPLEMENTATION_SLOT == keccak256("org.zeppelinos.proxy.implementation")); _setImplementation(_implementation); if(_data.length > 0) { require(_implementation.delegatecall(_data)); } } /** * @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(ZOSLibAddress.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 ethereum/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. * @param _implementation address of the initial implementation. * @param _admin Address of the proxy administrator. * @param _data Data to send as msg.data to the implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. */ constructor(address _implementation, address _admin, bytes _data) UpgradeabilityProxy(_implementation, _data) public payable { assert(ADMIN_SLOT == keccak256("org.zeppelinos.proxy.admin")); _setAdmin(_admin); } /** * @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/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. */ function upgradeToAndCall(address newImplementation, bytes data) payable external ifAdmin { _upgradeTo(newImplementation); require(newImplementation.delegatecall(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: zos-lib/contracts/application/App.sol /** * @title App * @dev Contract for upgradeable applications. * It handles the creation of proxies. */ contract App is ZOSLibOwnable { /** * @dev Emitted when a new proxy is created. * @param proxy Address of the created proxy. */ event ProxyCreated(address proxy); /** * @dev Emitted when a package dependency is changed in the application. * @param providerName Name of the package that changed. * @param package Address of the package associated to the name. * @param version Version of the package in use. */ event PackageChanged(string providerName, address package, uint64[3] version); /** * @dev Tracks a package in a particular version, used for retrieving implementations */ struct ProviderInfo { Package package; uint64[3] version; } /** * @dev Maps from dependency name to a tuple of package and version */ mapping(string => ProviderInfo) internal providers; /** * @dev Constructor function. */ constructor() public { } /** * @dev Returns the provider for a given package name, or zero if not set. * @param packageName Name of the package to be retrieved. * @return The provider. */ function getProvider(string packageName) public view returns (ImplementationProvider provider) { ProviderInfo storage info = providers[packageName]; if (address(info.package) == address(0)) return ImplementationProvider(0); return ImplementationProvider(info.package.getContract(info.version)); } /** * @dev Returns information on a package given its name. * @param packageName Name of the package to be queried. * @return A tuple with the package address and pinned version given a package name, or zero if not set */ function getPackage(string packageName) public view returns (Package, uint64[3]) { ProviderInfo storage info = providers[packageName]; return (info.package, info.version); } /** * @dev Sets a package in a specific version as a dependency for this application. * Requires the version to be present in the package. * @param packageName Name of the package to set or overwrite. * @param package Address of the package to register. * @param version Version of the package to use in this application. */ function setPackage(string packageName, Package package, uint64[3] version) public onlyOwner { require(package.hasVersion(version), "The requested version must be registered in the given package"); providers[packageName] = ProviderInfo(package, version); emit PackageChanged(packageName, package, version); } /** * @dev Unsets a package given its name. * Reverts if the package is not set in the application. * @param packageName Name of the package to remove. */ function unsetPackage(string packageName) public onlyOwner { require(address(providers[packageName].package) != address(0), "Package to unset not found"); delete providers[packageName]; emit PackageChanged(packageName, address(0), [uint64(0), uint64(0), uint64(0)]); } /** * @dev Returns the implementation address for a given contract name, provided by the `ImplementationProvider`. * @param packageName Name of the package where the contract is contained. * @param contractName Name of the contract. * @return Address where the contract is implemented. */ function getImplementation(string packageName, string contractName) public view returns (address) { ImplementationProvider provider = getProvider(packageName); if (address(provider) == address(0)) return address(0); return provider.getImplementation(contractName); } /** * @dev Creates a new proxy for the given contract and forwards a function call to it. * This is useful to initialize the proxied contract. * @param packageName Name of the package where the contract is contained. * @param contractName Name of the contract. * @param admin Address of the proxy administrator. * @param data Data to send as msg.data to the corresponding implementation to initialize the proxied contract. * It should include the signature and the parameters of the function to be called, as described in * https://solidity.readthedocs.io/en/v0.4.24/abi-spec.html#function-selector-and-argument-encoding. * This parameter is optional, if no data is given the initialization call to proxied contract will be skipped. * @return Address of the new proxy. */ function create(string packageName, string contractName, address admin, bytes data) payable public returns (AdminUpgradeabilityProxy) { address implementation = getImplementation(packageName, contractName); AdminUpgradeabilityProxy proxy = (new AdminUpgradeabilityProxy).value(msg.value)(implementation, admin, data); emit ProxyCreated(proxy); return proxy; } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Deployed Bytecode
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Swarm Source
bzzr://82554eaf536c0d193937f132068d40a645790be387cbcabfc1a4887a92cca2e7
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