Questions tagged [openzeppelin-contracts]
OpenZeppelin Contracts is a library for secure smart contract development. It provides implementations of standards like ERC20 and ERC721 which you can deploy as-is or extend to suit your needs, as well as Solidity components to build custom contracts and more complex decentralized systems.
282
questions
0
votes
0
answers
5
views
How to know if it is the correct address and calldata when holders call the propose function?
The propose function in the governance contract from OZ can receive any random address and calldata.
When the proposal is executed with the execution function in timeLockcontroller from OZ, the ...
- 159
0
votes
0
answers
7
views
What are the pros and cons of using OpenZeppelin ERC20Votes?
I want to use this extension for an ERC20 token.
What are the pros and cons (if any) of adding this to it?
- 538
0
votes
0
answers
22
views
Different address using Create2 due to difference in byteCode(type(ERC1967Proxy).creationCode and ethers.getContractFactory("ERC1967Proxy").bytecode
I am currently facing an issue while trying to calculate the address of a SimpleAccount contract using getCreate2Address() from ethers.utils in JavaScript. I noticed that the address I receive is ...
- 11
0
votes
1
answer
16
views
How can i pass constructor args to test solidity contracts in Hardhat?
I am using openzepplin with role based access control to create erc-20 token
constructor(address minter, address burner) ERC20("ArtPlace Token", "ARTP") {
_mint(msg.sender, ...
- 1
0
votes
0
answers
13
views
how to clone (minimal proxy pattern) a governance contract from OpenZeppelin
I am trying to clone oz's governance contract.
However, it looks very complicated.
Many contracts are inherited, and there are some values are set up in their constructors.
In this case, how am I ...
- 159
0
votes
0
answers
15
views
How can I make my solidity skill too strong?
I am solidity developer and have been coding in solidity for 6 months. I have made 6-7 projects with solidity. I want to make my solidity skill very strong. Give me some tips how can I do it?
- 595
0
votes
0
answers
6
views
Help me to make my idea clean on initializer, reinitializer and disableinitializer
Openzeppelin has a solidity script initializable.sol which has some modifiers and internal functions. I wanna clear my idea on these. I am describing what i know about it, correct me if i am wrong.
...
- 595
0
votes
0
answers
54
views
Derived contract must override function "supportsInterface". Two or more base classes define function with same name and parameter types
TypeError: Derived contract must override function "supportsInterface". Two or more base classes define function with same name and parameter types.
--> royalty.sol:9:1:
|
9 | contract ...
0
votes
1
answer
19
views
how to receive values from openzeppelin royaltyInfo function
trying to implement like this
uint[2] memory royalty = royaltyInfo(_tokenId, price);
payable(royalty[0]).transfer(royalty[1]);
but getting error
TypeError: Different number of components on the left ...
0
votes
0
answers
10
views
how to use onlyGovernance modifier?
I want to use onlyGovernance modifier in my contracts. I have a governance contract but I want to use this modifier that is not a governance contract. I want to use it so I can restrict some of my ...
- 212
1
vote
1
answer
53
views
onlyInitializing vs initializer in OpenZeppelin Upgradeable Contracts
I'm reading the OpenZeppelin documentation about upgradeable contracts, and I'm getting a bit confused with these modifiers:
initializer
onlyInitializing
I think I understand how initializer works. ...
- 1,451
0
votes
1
answer
31
views
When should I use ReentrancyGuard in a smart contract?
I am looking at the ReentrancyGuard smart contract from Open Zeppelin and I don't understand when I have to use it.
Is it necessary in all my smart contracts or do I only have to add it in some ...
- 538
1
vote
1
answer
16
views
Can a diamond Contract be cloned?
Error: invalid address or ENS name (argument="name", value=undefined, code=INVALID_ARGUMENT, version=contracts/5.7.0)
So this is the error that occured. I am trying to implement diamond ...
1
vote
1
answer
33
views
@openzeppelin/contracts import failed
The issue I am having is when I am trying to compile my contract, I am getting multiple errors for ERC721. As imported ERC721 is importing more contracts, as seen from the errors, the issue is that it ...
- 13
2
votes
1
answer
95
views
How many storage gaps to add at the end of Base Upgradeable Contracts?
I have read about adding Storage gaps at the end of Base Upgradeable Contracts for reserving storage slots. More detailed explaination in Openzeppelin Docs here.
But what is the exact amount of ...
3
votes
1
answer
156
views
What are Hooks and How are they used? Went thorough the explanation on the topic but can't wrap my head around it
So in the ERC720 contract there is a _transfer function which is calling a hook named _beforeTokenTransfer().
As we see in the image _beforeTokenTransfer is called and I understand it may be calling ...
3
votes
2
answers
66
views
Is there anything called conditional access control in solidity?
So here is my problem .
I have 2 users of my DApp : Admin and User
Admin is the contract owner and can access admin panel of my DApp . User is a normal user having something like a conditional access ....
- 302
2
votes
1
answer
82
views
Can I change Openzeppelin access control without having the right permissions?
If you check this link: openzeppelin github access control
you will notice they use 2 function for granting a role:
function grantRole(bytes32 role, address account) public virtual override onlyRole(...
- 33
2
votes
2
answers
312
views
Expected string literal (path), "*" or alias list
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol&...
- 23
0
votes
1
answer
32
views
Why the default mint() signatures in OpenZeppelin's ERC1155 wizard use "onlyOwner" modifier?
If you visit OpenZeppelin's ERC1155 wizard (https://wizard.openzeppelin.com/#erc1155) and check the "Mintable" checkbox, two functions will be created in the contract:
function mint(address ...
- 139
1
vote
1
answer
681
views
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/utils' is not defined by "exports" in node_modules\ethers\package.json
Hello everyone I am trying to deploy my ERC721Upgradeable NFT Marketplace Smart Contracts in the local hardhat network but I am getting a error regarding it. I am using Openzeppelin's Upgradeable ...
0
votes
0
answers
23
views
To hash or not to hash strings for bytes32 AccessControl roles
Is there a preferred/safest way to declare roles for Openzeppelin's AccessControl.sol?
I would imagine a straight assignment of a bytes32 from a string would be sufficient for role creation as long as ...
0
votes
1
answer
36
views
Getting error while making ERC721 soul bound
I am making a soul-bound NFT using openzeppelin and foundry in solidity ^0.8.13
And for that, I am overriding the _beforeTokenTransfer but on that function, I am getting an error.
Function has ...
- 74
1
vote
1
answer
36
views
Read value from DelegateCall
I would like to implement a whitelist using AccessControl of openzeppelin. Let's say I have the following setup:
Contract A: It's doing some stuff but only for users that are whitelisted.
// SPDX-...
- 11
1
vote
1
answer
67
views
How to permission the initialize function in upgradeable contracts?
From what I understand, for UUPS proxies: the proxy contract is ERC1967Proxy.sol from OpenZeppelin Contracts and the implementation contract should inherit from UUPSUpgradeable.sol in OpenZeppelin ...
- 578
0
votes
1
answer
88
views
how to implement a crowdsale using the current version of openzeppelin 4.X
I develop smart contracts and I really like to use openzeppelin libraries for this, I know how to implement ICO using Crowdsale.sol contract from openzeppelin, but there is no such contract in the ...
- 127
0
votes
0
answers
39
views
Generate EDSCA recoverable signature for use with OpenZeppelin EDSCA contract (Embedded/C/C++ Hardware wallet)
I'd like to sign a message on an Arduino-compatible microcontroller, and create a recoverable signature which can be used with EIP-191 and Ethereum's erecover / OpenZeppelin's ECDSA smart contracts to ...
- 101
0
votes
0
answers
41
views
Transaction has been reverted by the EVM, error while minting through the contract
The contract was working fine, It already minted 3201 NFTs and now suddenly I face the error Transaction has been reverted by the EVM
The max_supply is set to 5000 and hence thats not a problem too.
...
0
votes
2
answers
34
views
Approve and disapprove a transaction
i want to develop a contract student in which student sign a transaction to update its record and owner would be able to approve or disapprove this transaction how would I able to do this.
- 13
0
votes
0
answers
30
views
Can Ethereum smart contract sell token at fixed price that includes gas fee?
I am new to solidity and Ethereum in general.
I am using openZeppelin lib and trying to modify an existing contract that exchanges ERC-1155 tokens so, that the price it expects to be payed for token ...
0
votes
1
answer
405
views
Use cases of UUPS proxies over Transparent?
What are the use cases where UUPS proxies are more suitable apart from achieving immutability as the logic to update the contract resides in the Logic contract rather than proxies.
Thank you!
- 5
0
votes
1
answer
129
views
My Openzepplin ERC-721 import is not compiling
Creating a minting capability for my dApp. Cannot compile due to solidity version error I believe.
// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;
import "@openzeppelin/...
0
votes
1
answer
33
views
In an ERC721 contract how to create a status variable that saves -1 to indicate that an nft owner decided to transfer it to another address
In an ERC721 contract how to create a status variable that saves -1 to indicate that an nft owner address no longer owns it because it has decided to transfer it to another address.
In order to ...
0
votes
1
answer
68
views
non payable function with payable modifier
I have a non payable function to propose function. It has a modifier called isSubmitFeePaid. Modifier call a payable function. I am writing a script to propose. But problem is when i try call purpose ...
- 61
0
votes
1
answer
119
views
Governance Contract too large for Test Net Deployment
I am trying to deploy this governance contract, created using OpenZeppelin Template and it gives me the ERROR:
Warning: Contract code size is 29977 bytes and exceeds 24576 bytes (a limit introduced in ...
0
votes
1
answer
134
views
TokenOfOwnerByIndex throws exception in one function but works on another with the same loop
I do Not understand how Erc721.tokenOfOwnerByIndex can not pass its require in this simple case:
function cancelAllSales() external onlyOwner {
require(_powerSwitch == false, "System is still ...
0
votes
1
answer
267
views
How can i verify more params with _hashTypedDataV4 from openzeppelin?
i'm trying to implement a 712 typed signature with openzeppelin:
The contract has two functions:
struct ProofData {
address user;
}
bytes32 constant TYPE_HASH_EASY = keccak256("ProofData(...
- 101
0
votes
1
answer
282
views
users -> proxy -> proxy -> smart contract
I'm writing smart contract for Ethereum using Solidity and OpenZeppelin. I wish to implement this kind of situation
Where I deploy a proxy for each user and a proxy uses the same smart contract with ...
- 3
1
vote
1
answer
255
views
How does the openzeppelin library Bitmaps actually work?
The openzeppelin provides a data structure library namely BitMaps which can be found here -
https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/structs/BitMaps.sol
Can ...
- 23
1
vote
1
answer
1k
views
How does tokenURI is set in the ERC721 implementation?
Recently, I was studying the ERC721 smart contract and came across something which I coult not understand.
Look at the following code -
function tokenURI(uint256 tokenId) public view virtual ...
- 23
0
votes
1
answer
64
views
Upgrade contract version for upgradeable contracs
Case:
We have a bunch of contracts with version 6.0.0.
The upgradeability implemented using @openzeppelin/contracts-ethereum-package libraries
How can I upgrade the solidity version to latest and ...
- 1
0
votes
0
answers
87
views
Unable to initialize OpenZeppelin Clone contract during Hardhat Test (Error: VM Exception)
I'm trying to create clones of my implementation contract (EIP-1167) using the OpenZeppelin Clones library, however I keep getting a VM Exception Error.
This is the 'Initialize' function of my ...
- 100
4
votes
0
answers
108
views
Why does Ownable.sol from OpenZeppelin rely so much on the use of functions?
I wondered why OpenZeppelin relies so much on the use of functions when, at first glance, they seem unnecessary for such elementary operations. For example, take the Ownable.sol contract. Why isn't ...
- 51
1
vote
0
answers
122
views
UUPS upgradeable contract call fails with delegatecall error when calling newly added functions
I created an upgradeable contract adhering to the UUPS standard following this guide here. I then added some new functions, deployed the upgrade using the upgrades plugin upgrades.prepareUpgrade() ...
- 294
1
vote
1
answer
252
views
How can I clone a contract (using Openzeppelin 'clones') which contains a chainlink vrfCoordinator address in it's constructor?
I'm trying to clone a Lottery contract which contains Chainlink VRF Coordinator address as part of the contructor. This is the constructor of the main contract which I'd like to clone:
constructor(...
- 100
0
votes
1
answer
130
views
What is the purpose of this line of code in OpenZeppelin's ERC-20 example?
I was wondering how if(currentAllowance != type(uint256).max) worked in the following function from OpenZeppelin's ERC-20 template. I understand the purpose of this line -- to make sure there's no ...
- 95
1
vote
0
answers
43
views
OpenZeppelin AccessControl state shared between contracts rather that inheriting
I have contracts Marketplace and Escrow, and I want to share AccessControl state between the two, for instance I want to be able to grant and check roles from both contracts but having one source of ...
- 113
0
votes
1
answer
209
views
Hardhat — Can't verify an ERC20 token on Rinkeby
I am creating an ERC20 token using Openzeppelin's ERC20 contract, I wrote the deploy script using hardhat-deploy and it is running. But, when trying to run the hardhat verify script on that smart ...
- 133
0
votes
1
answer
549
views
I am unable to import the safe math library in my 0.6.12 version of my compiler
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import &...
1
vote
0
answers
115
views
Trouble with Solidity Compiler Version when combining Aave and Openzeppelin in Foundry
I'm trying to follow this tutorial by Patrick Collins on Flashloans but in Foundry: https://www.youtube.com/watch?v=Aw7yvGFtOvI&t=328s
When in try to forge build I get the following error:
: src\...
- 21