@lifi/sdk/src/_esm/core/EVM/checkPermitSupport.js

LI.FI Any-to-Any Cross-Chain-Swap SDK

import { ChainType } from '@lifi/types';
import { config } from '../../config.js';
import { getActionWithFallback } from './getActionWithFallback.js';
import { getAllowance } from './getAllowance.js';
import { getNativePermit } from './permits/getNativePermit.js';
import { getPublicClient } from './publicClient.js';
/**
 * Checks what permit types are supported for a token on a specific chain.
 * Checks in order:
 * 1. Native permit (EIP-2612) support
 * 2. Permit2 availability and allowance
 *
 * @param chain - The chain to check permit support on
 * @param tokenAddress - The token address to check
 * @param ownerAddress - The address that would sign the permit
 * @param amount - The amount to check allowance against for Permit2
 * @returns Object indicating which permit types are supported
 */
export const checkPermitSupport = async ({ chain, tokenAddress, ownerAddress, amount, }) => {
    const provider = config.getProvider(ChainType.EVM);
    let client = await provider?.getWalletClient?.();
    if (!client) {
        client = await getPublicClient(chain.id);
    }
    const nativePermit = await getActionWithFallback(client, getNativePermit, 'getNativePermit', {
        chainId: chain.id,
        tokenAddress,
        spenderAddress: chain.permit2Proxy,
        amount,
    });
    let permit2Allowance;
    // Check Permit2 allowance if available on chain
    if (chain.permit2) {
        permit2Allowance = await getAllowance(client, tokenAddress, ownerAddress, chain.permit2);
    }
    return {
        nativePermitSupported: !!nativePermit,
        permit2AllowanceSufficient: !!permit2Allowance && permit2Allowance >= amount,
    };
};
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