generate-multichain-uniswap-standard-list.js

const fs = require('fs');
const path = require('path');
const contractMap = require('./buildindex.js');

const timestamp = new Date().toISOString();

function createUniswapTokenList() {
  const tokens = Object.entries(contractMap)
    .filter(([key]) => key.startsWith('eip155:'))
    .map(([key, data]) => {
      // Parse the CAIP-19 ID to extract chain and address information
      // Expected format: eip155:1/erc20:0xAddress
      const [chainPart, addressPart] = key.split('/');
      const chainId = parseInt(chainPart.split(':')[1], 10);
      const address = addressPart.split(':')[1];

      let logoURI = '';
      if (data.logo) {
        const logoFileName = data.logo.split('/').pop();
        logoURI = `https://raw.githubusercontent.com/MetaMask/contract-metadata/master/icons/${chainPart}/${addressPart}.${logoFileName.split('.').pop()}`;
      }

      return {
        chainId,
        address,
        name: data.name || '',
        symbol: data.symbol || '',
        decimals: data.decimals || 18,
        logoURI
      };
    });

  // Create the token list structure according to Uniswap standard
  const tokenList = {
    name: "MetaMask Token List",
    logoURI: "https://images.ctfassets.net/clixtyxoaeas/1ezuBGezqfIeifWdVtwU4c/d970d4cdf13b163efddddd5709164d2e/MetaMask-icon-Fox.svg",
    keywords: [
      "metamask",
    ],
    timestamp,
    tokens,
    version: {
      major: 1,
      minor: 0,
      patch: 0
    }
  };

  return tokenList;
}

const tokenList = createUniswapTokenList();
const outputPath = path.join(__dirname, 'metamask-uniswap-tokenlist.json');

try {
  fs.writeFileSync(
    outputPath,
    JSON.stringify(tokenList, null, 2),
    'utf8'
  );
  console.log(`Successfully wrote MetaMask Uniswap token list to ${outputPath}`);
} catch (error) {
  console.error('Error writing Uniswap token list:', error);
  process.exit(1);
}