Using Uniswap universal router without permit2: A guide for web3.py
As a developer using web3.py and an account hosted by Geth node, you are probably aware of the importance of managing private keys. However, when it comes to implementing smart contracts on the Ethereum blockchain, certain requirements must be met to avoid security risks and to ensure compatibility with various platforms.
What is allowed2?
Allowing2 is a mechanism provided by the Ethereum Foundation that allows developers to sign transactions using a single private key, without revealing sensitive information about their wallet or account. This feature was introduced in 2017 as an alternative to the traditional signature scheme with public key used in the Ethereum network.
The problem with the signature generation of permit **
Unfortunately, web3.py does not accept the generation of signatures allowed2 from the box. According to the Ethereum documentation, it is currently accepted only by decentralized applications (DAPP) that use the web3.js library and are configured to use a private key to signing transactions.
Using Uniswap’s universal router
Fortunately, there is an alternative solution: using Uniswap’s universal router. The universal router allows you to perform intelligent contract functions on behalf of the Geth node without requiring direct access to your private key or to the signature that allows2.
To start with Uniswap’s universal router, follow these steps:
- Install UNISWAP Library : First, install UNISWAP Library for Python using PIP:
`Bash
PIP Install Uniswap
- Set up the universal router :
Uniswap offers a simple way to configure the universal router. You can do this by creating aConfig.
Here is an example of the config.jsona file for an account hosted by the Geth node:
Json
{
"node": {
"host": "
"Port": 8545,
"Privatekey": "
},
"Uniswaprouteraddresns": "0x ... address of universal router ..."
}
Replacewith the private key to your Geth node andwith the address of the universal router.
- Create a Web3 supplier :
To use Uniswap’s universal router, you will need to create a web3 supplier that can connect to your Geth node.
Here is an example using the «Eth-Apis» library:
`Python
from the import client et as ethclient
Create a new customer instance with your private key and other configuration details
Customer = EthClient (config = {"node": " "port": 8545, "Privatekey": "
Get a UNISWAP router instance
uniswap_rouuter = customer.uniswap ()
Execute a function using the universal router
Def executor_function (function):
result = function ()
Return result
@execut_function
def my_uniswap_function ():
Call UNISWAP feature here
pasha
- Call the function with Uniswap's universal router :
Now that you have created a web3 supplier and have performed your function using the UNISWAP router, you can directly name it without revealing sensitive information about your private key or permission signature.
Don't forget to replace
Please note that this is an example of implementation and may require additional changes to match your specific use case. Make sure you examine the Ethereum documentation and other resources for more information on the implementation of smart contracts in the Ethereum network.
