Contract Source Code:
// SPDX-License-Identifier: AGPL-3.0
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "openzeppelin-eth/contracts/token/ERC721/ERC721.sol";
import "openzeppelin-eth/contracts/token/ERC721/ERC721Enumerable.sol";
import "openzeppelin-eth/contracts/token/ERC721/IERC721Metadata.sol";
import "./PoapRoles.sol";
import "./PoapPausable.sol";
/**
* @title POAP contract in Ethereum
* @dev Mainnet point of interaction with POAP
* - Users can:
* # Add Event Organizer
* # Mint token for an event
* # Batch Mint
* # Burn Tokens if admin
* # Pause contract if admin
* # Unpause contract if admin
* # ERC721 full interface (base, metadata, enumerable)
* - To be covered by a proxy contract
* @author POAP
* - Developers:
* # Agustin Lavarello
* # Rodrigo Manuel Navarro Lajous
* # Ramiro Gonzales
**/
contract Poap is Initializable, ERC721, ERC721Enumerable, PoapRoles, PoapPausable {
/**
* @dev Emmited when token is created
*/
event EventToken(uint256 eventId, uint256 tokenId);
// Token name
string private _name;
// Token symbol
string private _symbol;
// Base token URI
string private _baseURI;
// Last Used id (used to generate new ids)
uint256 private lastId;
// Event Id for each token
mapping(uint256 => uint256) private _tokenEvent;
bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
/**
* @dev Gets the token name
* @return string representing the token name
*/
function name() external view returns (string memory) {
return _name;
}
/**
* @dev Gets the token symbol
* @return string representing the token symbol
*/
function symbol() external view returns (string memory) {
return _symbol;
}
/**
* @dev Gets the Event Id for the token
* @param tokenId ( uint256 ) The Token Id you want to query
* @return uint256 representing the Event id for the token
*/
function tokenEvent(uint256 tokenId) public view returns (uint256) {
return _tokenEvent[tokenId];
}
/**
* @dev Gets the Token Id and Event Id for a given index of the tokens list of the requested owner
* @param owner ( address ) Owner address of the token list to be queried
* @param index ( uint256 ) Index to be accessed of the requested tokens list
* @return ( uint256, uint256 ) Token Id and Event Id for the given index of the tokens list owned by the requested address
*/
function tokenDetailsOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId, uint256 eventId) {
tokenId = tokenOfOwnerByIndex(owner, index);
eventId = tokenEvent(tokenId);
}
/**
* @dev Gets URI for the token metadata
* @param tokenId ( uint256 ) The Token Id you want to get the URI
* @return ( string ) URI for the token metadata
*/
function tokenURI(uint256 tokenId) external view returns (string memory) {
uint eventId = _tokenEvent[tokenId];
return _strConcat(_baseURI, _uint2str(eventId), "/", _uint2str(tokenId), "");
}
/**
* @dev Sets Base URI for the token metadata.
* Requires
* - The msg sender to be the admin
* - The contract does not have to be paused
* @param baseURI ( string ) The base URI to change
*/
function setBaseURI(string memory baseURI) public onlyAdmin whenNotPaused {
_baseURI = baseURI;
}
/**
* @dev Approves another address to transfer the given token ID (Implements ERC71)
* Wrapper for function extended from ERC721 ( https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol )
* Requires
* - The msg sender to be the owner, approved, or operator
* - The contract does not have to be paused
* @param to ( address ) The addres to be approved for the given token ID
* @param tokenId ( uint256 ) ID of the token to be approved
*/
function approve(address to, uint256 tokenId) public whenNotPaused {
super.approve(to, tokenId);
}
/**
* @dev Sets or unsets the approval of a given operator (Implements ERC71)
* Wrapper for function extended from ERC721 ( https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol )
* Requires
* - The msg sender to be the owner, approved, or operator
* - The contract does not have to be paused
* @param to ( address ) The address of the operator to set the approval
* @param approved ( bool ) Represents the status of the approval to be set
*/
function setApprovalForAll(address to, bool approved) public whenNotPaused {
super.setApprovalForAll(to, approved);
}
/**
* @dev Transfers the ownership of a given token ID to another address
* Wrapper for function extended from ERC721 ( https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol )
* Requires
* - The msg sender to be the owner, approved, or operator
* - Contract not paused
* @param from ( address ) The address of the current owner of the token
* @param to ( address ) The address to receive the ownership of the given token ID
* @param tokenId ( uint256 ) ID of the token to be transferred
*/
function transferFrom(address from, address to, uint256 tokenId) public whenNotPaused {
super.transferFrom(from, to, tokenId);
}
/**
* @dev Safely transfers the ownership of a given token ID to another address (Implements ERC71)
* Wrapper for function extended from ERC721 ( https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol )
* Requires
* - The msg sender to be the owner, approved, or operator
* - The contract does not have to be paused
* @param from ( address ) The address of the current owner of the token
* @param to ( address ) The address to receive the ownership of the given token ID
* @param tokenId ( uint256 ) ID of the token to be transferred
*/
function safeTransferFrom(address from, address to, uint256 tokenId) public whenNotPaused {
super.safeTransferFrom(from, to, tokenId);
}
/**
* @dev Safely transfers the ownership of a given token ID to another address (Implements ERC71)
* Wrapper for function extended from ERC721 ( https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC721/ERC721.sol )
* Requires
* - The msg sender to be the owner, approved, or operator
* - The contract does not have to be paused
* @param from ( address ) The address of the current owner of the token
* @param to ( address ) The address to receive the ownership of the given token ID
* @param tokenId ( uint256 ) ID of the token to be transferred
* @param _data ( bytes ) Data to send along with a safe transfer check
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public whenNotPaused {
super.safeTransferFrom(from, to, tokenId, _data);
}
/**
* @dev Mint token to address
* @param eventId ( uint256 ) EventId for the new token
* @param to ( address ) The address that will receive the minted tokens.
* @return A boolean that indicates if the operation was successful.
*/
function mintToken(uint256 eventId, address to)
public whenNotPaused onlyEventMinter(eventId) returns (bool)
{
lastId += 1;
return _mintToken(eventId, lastId, to);
}
/**
* @dev Mint specific token to address.
* Requires
* - The msg sender to be the admin, or event minter for the specific event Id
* - The contract does not have to be paused
* @param eventId ( uint256 ) EventId for the new token
* @param tokenId ( uint256 ) Token Id for the new token
* @param to ( address ) The address that will receive the minted tokens.
* @return A boolean that indicates if the operation was successful.
*/
function mintToken(uint256 eventId, uint256 tokenId, address to)
public whenNotPaused onlyEventMinter(eventId) returns (bool)
{
return _mintToken(eventId, tokenId, to);
}
/**
* @dev Mint token to many addresses.
* Requires
* - The msg sender to be the admin, or event minter for the specific event Id
* - The contract does not have to be paused
* @param eventId ( uint256 ) EventId for the new token
* @param to ( array of address ) The addresses that will receive the minted tokens.
* @return A boolean that indicates if the operation was successful.
*/
function mintEventToManyUsers(uint256 eventId, address[] memory to)
public whenNotPaused onlyEventMinter(eventId) returns (bool)
{
for (uint256 i = 0; i < to.length; ++i) {
_mintToken(eventId, lastId + 1 + i, to[i]);
}
lastId += to.length;
return true;
}
/**
* @dev Mint many tokens to address.
* Requires
* - The msg sender to be the admin
* - The contract does not have to be paused
* @param eventIds ( array uint256 ) Event Ids to assing to user
* @param to ( address ) The address that will receive the minted tokens.
* @return A boolean that indicates if the operation was successful.
*/
function mintUserToManyEvents(uint256[] memory eventIds, address to)
public whenNotPaused onlyAdmin() returns (bool)
{
for (uint256 i = 0; i < eventIds.length; ++i) {
_mintToken(eventIds[i], lastId + 1 + i, to);
}
lastId += eventIds.length;
return true;
}
/**
* @dev Burns a specific ERC721 token.
* Requires
* - The msg sender to be the owner, approved, or admin
* @param tokenId ( uint256 ) Id of the ERC721 token to be burned.
*/
function burn(uint256 tokenId) public {
require(_isApprovedOrOwner(msg.sender, tokenId) || isAdmin(msg.sender), "Sender doesn't have permission");
_burn(tokenId);
}
function initialize(string memory __name, string memory __symbol, string memory __baseURI, address[] memory admins)
public initializer
{
ERC721.initialize();
ERC721Enumerable.initialize();
PoapRoles.initialize(msg.sender);
PoapPausable.initialize();
// Add the requested admins
for (uint256 i = 0; i < admins.length; ++i) {
_addAdmin(admins[i]);
}
_name = __name;
_symbol = __symbol;
_baseURI = __baseURI;
// Register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721_METADATA);
}
/**
* @dev Internal function to burn a specific token
* - Reverts if the token does not exist
* @param owner ( addreess ) The owner of the token to burn
* @param tokenId ( uint256 ) ID of the token being burned by the msg.sender
*/
function _burn(address owner, uint256 tokenId) internal {
super._burn(owner, tokenId);
delete _tokenEvent[tokenId];
}
/**
* @dev Internal function to mint tokens
* @param eventId ( uint256 ) EventId for the new token
* @param tokenId ( uint256 ) The token id to mint.
* @param to ( address ) The address that will receive the minted tokens.
* @return A boolean that indicates if the operation was successful.
*/
function _mintToken(uint256 eventId, uint256 tokenId, address to) internal returns (bool) {
_mint(to, tokenId);
_tokenEvent[tokenId] = eventId;
emit EventToken(eventId, tokenId);
return true;
}
/**
* @dev Function to convert uint to string
* Taken from https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
*/
function _uint2str(uint _i) internal pure returns (string memory _uintAsString) {
if (_i == 0) {
return "0";
}
uint j = _i;
uint len;
while (j != 0) {
len++;
j /= 10;
}
bytes memory bstr = new bytes(len);
uint k = len - 1;
while (_i != 0) {
bstr[k--] = byte(uint8(48 + _i % 10));
_i /= 10;
}
return string(bstr);
}
/**
* @dev Function to concat strings
* Taken from https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
*/
function _strConcat(string memory _a, string memory _b, string memory _c, string memory _d, string memory _e)
internal pure returns (string memory _concatenatedString)
{
bytes memory _ba = bytes(_a);
bytes memory _bb = bytes(_b);
bytes memory _bc = bytes(_c);
bytes memory _bd = bytes(_d);
bytes memory _be = bytes(_e);
string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
bytes memory babcde = bytes(abcde);
uint k = 0;
uint i = 0;
for (i = 0; i < _ba.length; i++) {
babcde[k++] = _ba[i];
}
for (i = 0; i < _bb.length; i++) {
babcde[k++] = _bb[i];
}
for (i = 0; i < _bc.length; i++) {
babcde[k++] = _bc[i];
}
for (i = 0; i < _bd.length; i++) {
babcde[k++] = _bd[i];
}
for (i = 0; i < _be.length; i++) {
babcde[k++] = _be[i];
}
return string(babcde);
}
/**
* @dev Admin can remove other Admin.
* @param account ( address ) Address of the admin to be removed
*/
function removeAdmin(address account) public onlyAdmin {
_removeAdmin(account);
}
}
pragma solidity >=0.4.24 <0.6.0;
/**
* @title Initializable
*
* @dev Helper contract to support initializer functions. To use it, replace
* the constructor with a function that has the `initializer` modifier.
* WARNING: Unlike constructors, initializer functions must be manually
* invoked. This applies both to deploying an Initializable contract, as well
* as extending an Initializable contract via inheritance.
* WARNING: When used with inheritance, manual care must be taken to not invoke
* a parent initializer twice, or ensure that all initializers are idempotent,
* because this is not dealt with automatically as with constructors.
*/
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 use in the initializer function of a contract.
*/
modifier initializer() {
require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");
bool wasInitializing = initializing;
initializing = true;
initialized = true;
_;
initializing = wasInitializing;
}
/// @dev Returns true if and only if the function is running in the constructor
function isConstructor() private view returns (bool) {
// extcodesize checks the size of the code stored in an address, and
// address returns the current address. Since the code is still not
// deployed when running a constructor, any checks on its code size will
// yield zero, making it an effective way to detect if a contract is
// under construction or not.
uint256 cs;
assembly { cs := extcodesize(address) }
return cs == 0;
}
// Reserved storage space to allow for layout changes in the future.
uint256[50] private ______gap;
}
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "../../math/SafeMath.sol";
import "../../utils/Address.sol";
import "../../drafts/Counters.sol";
import "../../introspection/ERC165.sol";
/**
* @title ERC721 Non-Fungible Token Standard basic implementation
* @dev see https://eips.ethereum.org/EIPS/eip-721
*/
contract ERC721 is Initializable, ERC165, IERC721 {
using SafeMath for uint256;
using Address for address;
using Counters for Counters.Counter;
// Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
// which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;
// Mapping from token ID to owner
mapping (uint256 => address) private _tokenOwner;
// Mapping from token ID to approved address
mapping (uint256 => address) private _tokenApprovals;
// Mapping from owner to number of owned token
mapping (address => Counters.Counter) private _ownedTokensCount;
// Mapping from owner to operator approvals
mapping (address => mapping (address => bool)) private _operatorApprovals;
bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
/*
* 0x80ac58cd ===
* bytes4(keccak256('balanceOf(address)')) ^
* bytes4(keccak256('ownerOf(uint256)')) ^
* bytes4(keccak256('approve(address,uint256)')) ^
* bytes4(keccak256('getApproved(uint256)')) ^
* bytes4(keccak256('setApprovalForAll(address,bool)')) ^
* bytes4(keccak256('isApprovedForAll(address,address)')) ^
* bytes4(keccak256('transferFrom(address,address,uint256)')) ^
* bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
* bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
*/
function initialize() public initializer {
ERC165.initialize();
// register the supported interfaces to conform to ERC721 via ERC165
_registerInterface(_INTERFACE_ID_ERC721);
}
function _hasBeenInitialized() internal view returns (bool) {
return supportsInterface(_INTERFACE_ID_ERC721);
}
/**
* @dev Gets the balance of the specified address
* @param owner address to query the balance of
* @return uint256 representing the amount owned by the passed address
*/
function balanceOf(address owner) public view returns (uint256) {
require(owner != address(0));
return _ownedTokensCount[owner].current();
}
/**
* @dev Gets the owner of the specified token ID
* @param tokenId uint256 ID of the token to query the owner of
* @return address currently marked as the owner of the given token ID
*/
function ownerOf(uint256 tokenId) public view returns (address) {
address owner = _tokenOwner[tokenId];
require(owner != address(0));
return owner;
}
/**
* @dev Approves another address to transfer the given token ID
* The zero address indicates there is no approved address.
* There can only be one approved address per token at a given time.
* Can only be called by the token owner or an approved operator.
* @param to address to be approved for the given token ID
* @param tokenId uint256 ID of the token to be approved
*/
function approve(address to, uint256 tokenId) public {
address owner = ownerOf(tokenId);
require(to != owner);
require(msg.sender == owner || isApprovedForAll(owner, msg.sender));
_tokenApprovals[tokenId] = to;
emit Approval(owner, to, tokenId);
}
/**
* @dev Gets the approved address for a token ID, or zero if no address set
* Reverts if the token ID does not exist.
* @param tokenId uint256 ID of the token to query the approval of
* @return address currently approved for the given token ID
*/
function getApproved(uint256 tokenId) public view returns (address) {
require(_exists(tokenId));
return _tokenApprovals[tokenId];
}
/**
* @dev Sets or unsets the approval of a given operator
* An operator is allowed to transfer all tokens of the sender on their behalf
* @param to operator address to set the approval
* @param approved representing the status of the approval to be set
*/
function setApprovalForAll(address to, bool approved) public {
require(to != msg.sender);
_operatorApprovals[msg.sender][to] = approved;
emit ApprovalForAll(msg.sender, to, approved);
}
/**
* @dev Tells whether an operator is approved by a given owner
* @param owner owner address which you want to query the approval of
* @param operator operator address which you want to query the approval of
* @return bool whether the given operator is approved by the given owner
*/
function isApprovedForAll(address owner, address operator) public view returns (bool) {
return _operatorApprovals[owner][operator];
}
/**
* @dev Transfers the ownership of a given token ID to another address
* Usage of this method is discouraged, use `safeTransferFrom` whenever possible
* Requires the msg.sender to be the owner, approved, or operator
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function transferFrom(address from, address to, uint256 tokenId) public {
require(_isApprovedOrOwner(msg.sender, tokenId));
_transferFrom(from, to, tokenId);
}
/**
* @dev Safely transfers the ownership of a given token ID to another address
* If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
* Requires the msg.sender to be the owner, approved, or operator
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function safeTransferFrom(address from, address to, uint256 tokenId) public {
safeTransferFrom(from, to, tokenId, "");
}
/**
* @dev Safely transfers the ownership of a given token ID to another address
* If the target address is a contract, it must implement `onERC721Received`,
* which is called upon a safe transfer, and return the magic value
* `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
* the transfer is reverted.
* Requires the msg.sender to be the owner, approved, or operator
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes data to send along with a safe transfer check
*/
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public {
transferFrom(from, to, tokenId);
require(_checkOnERC721Received(from, to, tokenId, _data));
}
/**
* @dev Returns whether the specified token exists
* @param tokenId uint256 ID of the token to query the existence of
* @return bool whether the token exists
*/
function _exists(uint256 tokenId) internal view returns (bool) {
address owner = _tokenOwner[tokenId];
return owner != address(0);
}
/**
* @dev Returns whether the given spender can transfer a given token ID
* @param spender address of the spender to query
* @param tokenId uint256 ID of the token to be transferred
* @return bool whether the msg.sender is approved for the given token ID,
* is an operator of the owner, or is the owner of the token
*/
function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
address owner = ownerOf(tokenId);
return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
}
/**
* @dev Internal function to mint a new token
* Reverts if the given token ID already exists
* @param to The address that will own the minted token
* @param tokenId uint256 ID of the token to be minted
*/
function _mint(address to, uint256 tokenId) internal {
require(to != address(0));
require(!_exists(tokenId));
_tokenOwner[tokenId] = to;
_ownedTokensCount[to].increment();
emit Transfer(address(0), to, tokenId);
}
/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* Deprecated, use _burn(uint256) instead.
* @param owner owner of the token to burn
* @param tokenId uint256 ID of the token being burned
*/
function _burn(address owner, uint256 tokenId) internal {
require(ownerOf(tokenId) == owner);
_clearApproval(tokenId);
_ownedTokensCount[owner].decrement();
_tokenOwner[tokenId] = address(0);
emit Transfer(owner, address(0), tokenId);
}
/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* @param tokenId uint256 ID of the token being burned
*/
function _burn(uint256 tokenId) internal {
_burn(ownerOf(tokenId), tokenId);
}
/**
* @dev Internal function to transfer ownership of a given token ID to another address.
* As opposed to transferFrom, this imposes no restrictions on msg.sender.
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function _transferFrom(address from, address to, uint256 tokenId) internal {
require(ownerOf(tokenId) == from);
require(to != address(0));
_clearApproval(tokenId);
_ownedTokensCount[from].decrement();
_ownedTokensCount[to].increment();
_tokenOwner[tokenId] = to;
emit Transfer(from, to, tokenId);
}
/**
* @dev Internal function to invoke `onERC721Received` on a target address
* The call is not executed if the target address is not a contract
* @param from address representing the previous owner of the given token ID
* @param to target address that will receive the tokens
* @param tokenId uint256 ID of the token to be transferred
* @param _data bytes optional data to send along with the call
* @return bool whether the call correctly returned the expected magic value
*/
function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
internal returns (bool)
{
if (!to.isContract()) {
return true;
}
bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data);
return (retval == _ERC721_RECEIVED);
}
/**
* @dev Private function to clear current approval of a given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function _clearApproval(uint256 tokenId) private {
if (_tokenApprovals[tokenId] != address(0)) {
_tokenApprovals[tokenId] = address(0);
}
}
uint256[50] private ______gap;
}
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "./IERC721Enumerable.sol";
import "./ERC721.sol";
import "../../introspection/ERC165.sol";
/**
* @title ERC-721 Non-Fungible Token with optional enumeration extension logic
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
contract ERC721Enumerable is Initializable, ERC165, ERC721, IERC721Enumerable {
// Mapping from owner to list of owned token IDs
mapping(address => uint256[]) private _ownedTokens;
// Mapping from token ID to index of the owner tokens list
mapping(uint256 => uint256) private _ownedTokensIndex;
// Array with all token ids, used for enumeration
uint256[] private _allTokens;
// Mapping from token id to position in the allTokens array
mapping(uint256 => uint256) private _allTokensIndex;
bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;
/*
* 0x780e9d63 ===
* bytes4(keccak256('totalSupply()')) ^
* bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
* bytes4(keccak256('tokenByIndex(uint256)'))
*/
/**
* @dev Constructor function
*/
function initialize() public initializer {
require(ERC721._hasBeenInitialized());
// register the supported interface to conform to ERC721Enumerable via ERC165
_registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
}
function _hasBeenInitialized() internal view returns (bool) {
return supportsInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
}
/**
* @dev Gets the token ID at a given index of the tokens list of the requested owner
* @param owner address owning the tokens list to be accessed
* @param index uint256 representing the index to be accessed of the requested tokens list
* @return uint256 token ID at the given index of the tokens list owned by the requested address
*/
function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
require(index < balanceOf(owner));
return _ownedTokens[owner][index];
}
/**
* @dev Gets the total amount of tokens stored by the contract
* @return uint256 representing the total amount of tokens
*/
function totalSupply() public view returns (uint256) {
return _allTokens.length;
}
/**
* @dev Gets the token ID at a given index of all the tokens in this contract
* Reverts if the index is greater or equal to the total number of tokens
* @param index uint256 representing the index to be accessed of the tokens list
* @return uint256 token ID at the given index of the tokens list
*/
function tokenByIndex(uint256 index) public view returns (uint256) {
require(index < totalSupply());
return _allTokens[index];
}
/**
* @dev Internal function to transfer ownership of a given token ID to another address.
* As opposed to transferFrom, this imposes no restrictions on msg.sender.
* @param from current owner of the token
* @param to address to receive the ownership of the given token ID
* @param tokenId uint256 ID of the token to be transferred
*/
function _transferFrom(address from, address to, uint256 tokenId) internal {
super._transferFrom(from, to, tokenId);
_removeTokenFromOwnerEnumeration(from, tokenId);
_addTokenToOwnerEnumeration(to, tokenId);
}
/**
* @dev Internal function to mint a new token
* Reverts if the given token ID already exists
* @param to address the beneficiary that will own the minted token
* @param tokenId uint256 ID of the token to be minted
*/
function _mint(address to, uint256 tokenId) internal {
super._mint(to, tokenId);
_addTokenToOwnerEnumeration(to, tokenId);
_addTokenToAllTokensEnumeration(tokenId);
}
/**
* @dev Internal function to burn a specific token
* Reverts if the token does not exist
* Deprecated, use _burn(uint256) instead
* @param owner owner of the token to burn
* @param tokenId uint256 ID of the token being burned
*/
function _burn(address owner, uint256 tokenId) internal {
super._burn(owner, tokenId);
_removeTokenFromOwnerEnumeration(owner, tokenId);
// Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund
_ownedTokensIndex[tokenId] = 0;
_removeTokenFromAllTokensEnumeration(tokenId);
}
/**
* @dev Gets the list of token IDs of the requested owner
* @param owner address owning the tokens
* @return uint256[] List of token IDs owned by the requested address
*/
function _tokensOfOwner(address owner) internal view returns (uint256[] storage) {
return _ownedTokens[owner];
}
/**
* @dev Private function to add a token to this extension's ownership-tracking data structures.
* @param to address representing the new owner of the given token ID
* @param tokenId uint256 ID of the token to be added to the tokens list of the given address
*/
function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
_ownedTokensIndex[tokenId] = _ownedTokens[to].length;
_ownedTokens[to].push(tokenId);
}
/**
* @dev Private function to add a token to this extension's token tracking data structures.
* @param tokenId uint256 ID of the token to be added to the tokens list
*/
function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
_allTokensIndex[tokenId] = _allTokens.length;
_allTokens.push(tokenId);
}
/**
* @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
* while the token is not assigned a new owner, the _ownedTokensIndex mapping is _not_ updated: this allows for
* gas optimizations e.g. when performing a transfer operation (avoiding double writes).
* This has O(1) time complexity, but alters the order of the _ownedTokens array.
* @param from address representing the previous owner of the given token ID
* @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
*/
function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
// To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
uint256 tokenIndex = _ownedTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary
if (tokenIndex != lastTokenIndex) {
uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];
_ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
}
// This also deletes the contents at the last position of the array
_ownedTokens[from].length--;
// Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by
// lastTokenId, or just over the end of the array if the token was the last one).
}
/**
* @dev Private function to remove a token from this extension's token tracking data structures.
* This has O(1) time complexity, but alters the order of the _allTokens array.
* @param tokenId uint256 ID of the token to be removed from the tokens list
*/
function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
// To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
// then delete the last slot (swap and pop).
uint256 lastTokenIndex = _allTokens.length.sub(1);
uint256 tokenIndex = _allTokensIndex[tokenId];
// When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
// rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
// an 'if' statement (like in _removeTokenFromOwnerEnumeration)
uint256 lastTokenId = _allTokens[lastTokenIndex];
_allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
_allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
// This also deletes the contents at the last position of the array
_allTokens.length--;
_allTokensIndex[tokenId] = 0;
}
uint256[50] private ______gap;
}
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "./IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional metadata extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
contract IERC721Metadata is Initializable, IERC721 {
function name() external view returns (string memory);
function symbol() external view returns (string memory);
function tokenURI(uint256 tokenId) external view returns (string memory);
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.5.0;
import "zos-lib/contracts/Initializable.sol";
import "openzeppelin-eth/contracts/access/Roles.sol";
/**
* @title Roles contract
* @dev Base contract which allows children to implement role system.
* - Users can:
* # Add event minter if Event Minter or Admin
* # Add Admin if Admin
* # Check if addr is Admin
* # Check if addr is Event Minter for Event ID
* # Renounce Admin role
* # Renounce Event Minter role
* # Remove Event Minter if Admin
* @author POAP
* - Developers:
* # Agustin Lavarello
* # Rodrigo Manuel Navarro Lajous
* # Ramiro Gonzales
**/
contract PoapRoles is Initializable {
using Roles for Roles.Role;
/**
* @dev Emmited when an Admin is added
*/
event AdminAdded(address indexed account);
/**
* @dev Emmited when an Admin is removed
*/
event AdminRemoved(address indexed account);
/**
* @dev Emmited when an Event Minter is added
*/
event EventMinterAdded(uint256 indexed eventId, address indexed account);
/**
* @dev Emmited when an Event Minter is removed
*/
event EventMinterRemoved(uint256 indexed eventId, address indexed account);
Roles.Role private _admins;
mapping(uint256 => Roles.Role) private _minters;
function initialize(address sender) public initializer {
if (!isAdmin(sender)) {
_addAdmin(sender);
}
}
/**
* @dev Modifier to make a function callable only by the Admin.
*/
modifier onlyAdmin() {
require(isAdmin(msg.sender), "Sender is not Admin");
_;
}
/**
* @dev Modifier to make a function callable only by the Event Minter for especific Event Id.
* @param eventId ( uint256 ) The Event Id to check.
*/
modifier onlyEventMinter(uint256 eventId) {
require(isEventMinter(eventId, msg.sender), "Sender is not Event Minter");
_;
}
/**
* @dev Checks if address is Admin.
* @param account ( address ) The address to be checked.
* @return bool representing if the adddress is admin.
*/
function isAdmin(address account) public view returns (bool) {
return _admins.has(account);
}
/**
* @dev Checks if address is Event Minter for especific Event.
* @param eventId ( uint256 ) The Event ID to check.
* @param account ( address ) The address to be checked.
* @return bool representing if the adddress is Event Minter.
*/
function isEventMinter(uint256 eventId, address account) public view returns (bool) {
return isAdmin(account) || _minters[eventId].has(account);
}
/**
* @dev Function to add an Event Minter for especefic Event ID
* Requires
* - The msg sender to be the admin or Event Minter for the especific Event ID
* @param eventId ( uint256 ) The ID of the Event.
* @param account ( address ) The Address that will be granted permissions on the Event.
*/
function addEventMinter(uint256 eventId, address account) public onlyEventMinter(eventId) {
_addEventMinter(eventId, account);
}
/**
* @dev Function to add an Admin.
* Requires
* - The msg sender to be the admin.
* @param account ( address ) The Address that will be granted permissions as Admin.
*/
function addAdmin(address account) public onlyAdmin {
_addAdmin(account);
}
/**
* @dev Function renounce as Event Minter for especefic Event ID
* Requires
* - The msg sender to be an Event Minter for the especific Event ID
* @param eventId ( uint256 ) The ID of the Event.
*/
function renounceEventMinter(uint256 eventId) public {
_removeEventMinter(eventId, msg.sender);
}
/**
* @dev Function renounce as Admin
* Requires
* - The msg sender to be an Admin
*/
function renounceAdmin() public {
_removeAdmin(msg.sender);
}
/**
* @dev Function remove Event Minter for especif Event ID
* Requires
* - The msg sender to be an Admin
* @param eventId ( uint256 ) The ID of the Event.
* @param account ( address ) The Address that will be removed permissions as Event Minter for especific ID.
*/
function removeEventMinter(uint256 eventId, address account) public onlyAdmin {
_removeEventMinter(eventId, account);
}
/**
* @dev Internal function to add Event Minter
* @param eventId ( uint256 ) The ID of the Event.
* @param account ( address ) The Address that will be granted permissions on the Event.
*/
function _addEventMinter(uint256 eventId, address account) internal {
_minters[eventId].add(account);
emit EventMinterAdded(eventId, account);
}
/**
* @dev Internal function to add Admin
* @param account ( address ) The Address that will be granted permissions as Admin.
*/
function _addAdmin(address account) internal {
_admins.add(account);
emit AdminAdded(account);
}
/**
* @dev Internal function to remove Event Minter for especif Event ID
* @param eventId ( uint256 ) The ID of the Event.
* @param account ( address ) The Address that will be removed permissions as Event Minter for especific ID.
*/
function _removeEventMinter(uint256 eventId, address account) internal {
_minters[eventId].remove(account);
emit EventMinterRemoved(eventId, account);
}
/**
* @dev Internal function to remove an Admin
* @param account ( address ) The Address that will be removed permissions as Admin.
*/
function _removeAdmin(address account) internal {
_admins.remove(account);
emit AdminRemoved(account);
}
// For future extensions
uint256[50] private ______gap;
}
// SPDX-License-Identifier: agpl-3.0
pragma solidity ^0.5.0;
import "zos-lib/contracts/Initializable.sol";
import "./PoapRoles.sol";
/**
* @title Pausable contract
* @dev Base contract which allows children to implement an emergency stop mechanism.
* - Users can:
* # Pause contract if admin
* # Unpause contract if admin
* @author POAP
* - Developers:
* # Agustin Lavarello
* # Rodrigo Manuel Navarro Lajous
* # Ramiro Gonzales
**/
contract PoapPausable is Initializable, PoapRoles {
/**
* @dev Emmited when contract is paused
*/
event Paused(address account);
/**
* @dev Emmited when contract is unpaused
*/
event Unpaused(address account);
// Boolean to save if contract is paused
bool private _paused;
function initialize() public initializer {
_paused = false;
}
/**
* @dev Get if contract is paused
* @return ( bool ) If contract is paused
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!_paused, "Contract is Paused");
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(_paused, "Contract is not Paused");
_;
}
/**
* @dev Called by the owner to pause, triggers stopped state.
* Requires
* - The msg sender to be the admin
* - The contract does not have to be paused
*/
function pause() public onlyAdmin whenNotPaused {
_paused = true;
emit Paused(msg.sender);
}
/**
* @dev Called by the owner to pause, triggers unstopped state.
* Requires
* - The msg sender to be the admin
* - The contract does not have to be paused
*/
function unpause() public onlyAdmin whenPaused {
_paused = false;
emit Unpaused(msg.sender);
}
// For future extensions
uint256[50] private ______gap;
}
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "../../introspection/IERC165.sol";
/**
* @title ERC721 Non-Fungible Token Standard basic interface
* @dev see https://eips.ethereum.org/EIPS/eip-721
*/
contract IERC721 is Initializable, IERC165 {
event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
event ApprovalForAll(address indexed owner, address indexed operator, bool approved);
function balanceOf(address owner) public view returns (uint256 balance);
function ownerOf(uint256 tokenId) public view returns (address owner);
function approve(address to, uint256 tokenId) public;
function getApproved(uint256 tokenId) public view returns (address operator);
function setApprovalForAll(address operator, bool _approved) public;
function isApprovedForAll(address owner, address operator) public view returns (bool);
function transferFrom(address from, address to, uint256 tokenId) public;
function safeTransferFrom(address from, address to, uint256 tokenId) public;
function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}
pragma solidity ^0.5.2;
/**
* @title ERC721 token receiver interface
* @dev Interface for any contract that wants to support safeTransfers
* from ERC721 asset contracts.
*/
contract IERC721Receiver {
/**
* @notice Handle the receipt of an NFT
* @dev The ERC721 smart contract calls this function on the recipient
* after a `safeTransfer`. This function MUST return the function selector,
* otherwise the caller will revert the transaction. The selector to be
* returned can be obtained as `this.onERC721Received.selector`. This
* function MAY throw to revert and reject the transfer.
* Note: the ERC721 contract address is always the message sender.
* @param operator The address which called `safeTransferFrom` function
* @param from The address which previously owned the token
* @param tokenId The NFT identifier which is being transferred
* @param data Additional data with no specified format
* @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
*/
function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data)
public returns (bytes4);
}
pragma solidity ^0.5.2;
/**
* @title SafeMath
* @dev Unsigned math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two unsigned integers, reverts on overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two unsigned integers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
pragma solidity ^0.5.2;
/**
* Utility library of inline functions on addresses
*/
library Address {
/**
* 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.
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
}
pragma solidity ^0.5.2;
import "../math/SafeMath.sol";
/**
* @title Counters
* @author Matt Condon (@shrugs)
* @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
* of elements in a mapping, issuing ERC721 ids, or counting request ids
*
* Include with `using Counters for Counters.Counter;`
* Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the SafeMath
* overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
* directly accessed.
*/
library Counters {
using SafeMath for uint256;
struct Counter {
// This variable should never be directly accessed by users of the library: interactions must be restricted to
// the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
// this feature: see https://github.com/ethereum/solidity/issues/4637
uint256 _value; // default: 0
}
function current(Counter storage counter) internal view returns (uint256) {
return counter._value;
}
function increment(Counter storage counter) internal {
counter._value += 1;
}
function decrement(Counter storage counter) internal {
counter._value = counter._value.sub(1);
}
}
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "./IERC165.sol";
/**
* @title ERC165
* @author Matt Condon (@shrugs)
* @dev Implements ERC165 using a lookup table.
*/
contract ERC165 is Initializable, IERC165 {
bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
/*
* 0x01ffc9a7 ===
* bytes4(keccak256('supportsInterface(bytes4)'))
*/
/**
* @dev a mapping of interface id to whether or not it's supported
*/
mapping(bytes4 => bool) private _supportedInterfaces;
/**
* @dev A contract implementing SupportsInterfaceWithLookup
* implement ERC165 itself
*/
function initialize() public initializer {
_registerInterface(_INTERFACE_ID_ERC165);
}
/**
* @dev implement supportsInterface(bytes4) using a lookup table
*/
function supportsInterface(bytes4 interfaceId) public view returns (bool) {
return _supportedInterfaces[interfaceId];
}
/**
* @dev internal method for registering an interface
*/
function _registerInterface(bytes4 interfaceId) internal {
require(interfaceId != 0xffffffff);
_supportedInterfaces[interfaceId] = true;
}
uint256[50] private ______gap;
}
pragma solidity ^0.5.2;
/**
* @title IERC165
* @dev https://eips.ethereum.org/EIPS/eip-165
*/
interface IERC165 {
/**
* @notice Query if a contract implements an interface
* @param interfaceId The interface identifier, as specified in ERC-165
* @dev Interface identification is specified in ERC-165. This function
* uses less than 30,000 gas.
*/
function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
pragma solidity ^0.5.2;
import "zos-lib/contracts/Initializable.sol";
import "./IERC721.sol";
/**
* @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
* @dev See https://eips.ethereum.org/EIPS/eip-721
*/
contract IERC721Enumerable is Initializable, IERC721 {
function totalSupply() public view returns (uint256);
function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId);
function tokenByIndex(uint256 index) public view returns (uint256);
}
pragma solidity ^0.5.2;
/**
* @title Roles
* @dev Library for managing addresses assigned to a Role.
*/
library Roles {
struct Role {
mapping (address => bool) bearer;
}
/**
* @dev give an account access to this role
*/
function add(Role storage role, address account) internal {
require(account != address(0));
require(!has(role, account));
role.bearer[account] = true;
}
/**
* @dev remove an account's access to this role
*/
function remove(Role storage role, address account) internal {
require(account != address(0));
require(has(role, account));
role.bearer[account] = false;
}
/**
* @dev check if an account has this role
* @return bool
*/
function has(Role storage role, address account) internal view returns (bool) {
require(account != address(0));
return role.bearer[account];
}
}