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add: direct faucet for c-chain (#2602)
* add: direct faucet for c-chain * good now
1 parent 7a3cfe6 commit 82512a7

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-345
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4 files changed

+896
-345
lines changed

‎app/api/cchain-faucet/route.ts

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import { NextRequest, NextResponse } from 'next/server';
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import { createWalletClient, http, parseEther, createPublicClient } from 'viem';
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import { privateKeyToAccount } from 'viem/accounts';
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import { avalancheFuji, avalanche } from 'viem/chains';
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import { getAuthSession } from '@/lib/auth/authSession';
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import { rateLimit } from '@/lib/rateLimit';
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const SERVER_PRIVATE_KEY = process.env.FAUCET_C_CHAIN_PRIVATE_KEY;
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const FAUCET_C_CHAIN_ADDRESS = process.env.FAUCET_C_CHAIN_ADDRESS;
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const FIXED_AMOUNT = '2';
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if (!SERVER_PRIVATE_KEY || !FAUCET_C_CHAIN_ADDRESS) {
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console.error('necessary environment variables for C-Chain faucet are not set');
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}
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interface TransferResponse {
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success: boolean;
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txHash?: string;
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sourceAddress?: string;
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destinationAddress?: string;
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amount?: string;
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message?: string;
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}
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async function transferCChainAVAX(
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sourcePrivateKey: string,
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sourceAddress: string,
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destinationAddress: string,
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isTestnet: boolean
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): Promise<{ txHash: string }> {
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const chain = isTestnet ? avalancheFuji : avalanche;
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const account = privateKeyToAccount(sourcePrivateKey as `0x${string}`);
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const walletClient = createWalletClient({
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account,
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chain,
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transport: http()
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});
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const publicClient = createPublicClient({
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chain,
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transport: http()
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});
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const balance = await publicClient.getBalance({
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address: sourceAddress as `0x${string}`
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});
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const amountToSend = parseEther(FIXED_AMOUNT);
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if (balance < amountToSend) {
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throw new Error('Insufficient faucet balance');
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}
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const txHash = await walletClient.sendTransaction({
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to: destinationAddress as `0x${string}`,
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value: amountToSend,
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});
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return { txHash };
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}
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async function validateFaucetRequest(request: NextRequest): Promise<NextResponse | null> {
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try {
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const session = await getAuthSession();
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if (!session?.user) {
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return NextResponse.json(
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{ success: false, message: 'Authentication required' },
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{ status: 401 }
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);
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}
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if (!SERVER_PRIVATE_KEY || !FAUCET_C_CHAIN_ADDRESS) {
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return NextResponse.json(
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{ success: false, message: 'Server not properly configured' },
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{ status: 500 }
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);
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}
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const searchParams = request.nextUrl.searchParams;
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const destinationAddress = searchParams.get('address');
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if (!destinationAddress) {
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return NextResponse.json(
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{ success: false, message: 'Destination address is required' },
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{ status: 400 }
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);
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}
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if (!/^0x[a-fA-F0-9]{40}$/.test(destinationAddress)) {
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return NextResponse.json(
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{ success: false, message: 'Invalid Ethereum address format' },
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{ status: 400 }
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);
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}
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if (destinationAddress.toLowerCase() === FAUCET_C_CHAIN_ADDRESS?.toLowerCase()) {
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return NextResponse.json(
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{ success: false, message: 'Cannot send tokens to the faucet address' },
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{ status: 400 }
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);
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}
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return null;
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} catch (error) {
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console.error('Validation failed:', error);
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return NextResponse.json(
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{
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success: false,
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message: error instanceof Error ? error.message : 'Failed to validate request'
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},
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{ status: 500 }
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);
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}
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}
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async function handleFaucetRequest(request: NextRequest): Promise<NextResponse> {
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try {
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const searchParams = request.nextUrl.searchParams;
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const destinationAddress = searchParams.get('address')!;
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const isTestnet = true;
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const tx = await transferCChainAVAX(
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SERVER_PRIVATE_KEY!,
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FAUCET_C_CHAIN_ADDRESS!,
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destinationAddress,
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isTestnet
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);
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const response: TransferResponse = {
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success: true,
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txHash: tx.txHash,
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sourceAddress: FAUCET_C_CHAIN_ADDRESS,
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destinationAddress,
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amount: FIXED_AMOUNT
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};
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return NextResponse.json(response);
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} catch (error) {
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console.error('C-Chain transfer failed:', error);
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const response: TransferResponse = {
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success: false,
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message: error instanceof Error ? error.message : 'Failed to complete transfer'
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};
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return NextResponse.json(response, { status: 500 });
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}
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}
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export async function GET(request: NextRequest): Promise<NextResponse> {
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const validationResponse = await validateFaucetRequest(request);
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if (validationResponse) {
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return validationResponse;
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}
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const rateLimitHandler = rateLimit(handleFaucetRequest, {
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windowMs: 24 * 60 * 60 * 1000,
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maxRequests: 1
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});
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return rateLimitHandler(request);
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}

‎toolbox/src/components/ConnectWallet/CChainFaucetButton.tsx

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"use client";
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import { useState } from "react";
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import {
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AlertDialog,
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AlertDialogAction,
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AlertDialogContent,
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AlertDialogDescription,
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AlertDialogFooter,
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AlertDialogHeader,
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AlertDialogTitle,
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} from "../AlertDialog";
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import { useWalletStore } from "../../stores/walletStore";
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const LOW_BALANCE_THRESHOLD = 1;
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export const CChainFaucetButton = () => {
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const { walletEVMAddress, isTestnet, cChainBalance, updateCChainBalance } =
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useWalletStore();
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const [isRequestingCTokens, setIsRequestingCTokens] = useState(false);
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const [isAlertDialogOpen, setIsAlertDialogOpen] = useState(false);
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const [alertDialogTitle, setAlertDialogTitle] = useState("Error");
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const [alertDialogMessage, setAlertDialogMessage] = useState("");
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const [isLoginError, setIsLoginError] = useState(false);
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const handleLogin = () => {
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window.location.href = "/login";
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};
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const handleCChainTokenRequest = async () => {
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if (isRequestingCTokens || !walletEVMAddress) return;
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setIsRequestingCTokens(true);
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try {
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const response = await fetch(
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`/api/cchain-faucet?address=${walletEVMAddress}`
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);
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const rawText = await response.text();
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let data;
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try {
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data = JSON.parse(rawText);
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} catch (parseError) {
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throw new Error(`Invalid response: ${rawText.substring(0, 100)}...`);
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}
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if (!response.ok) {
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if (response.status === 401) {
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throw new Error("Please login first");
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}
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if (response.status === 429) {
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throw new Error(
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data.message || "Rate limit exceeded. Please try again later."
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);
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}
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throw new Error(
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data.message || `Error ${response.status}: Failed to get tokens`
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);
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}
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if (data.success) {
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console.log("C-Chain token request successful, txHash:", data.txHash);
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setTimeout(() => updateCChainBalance(), 3000);
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} else {
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throw new Error(data.message || "Failed to get tokens");
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}
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} catch (error) {
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console.error("C-Chain token request error:", error);
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const errorMessage =
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error instanceof Error ? error.message : "Unknown error occurred";
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if (errorMessage.includes("login") || errorMessage.includes("401")) {
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setAlertDialogTitle("Authentication Required");
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setAlertDialogMessage(
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"You need to be logged in to request free tokens from the C-Chain Faucet."
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);
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setIsLoginError(true);
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setIsAlertDialogOpen(true);
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} else {
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setAlertDialogTitle("Faucet Request Failed");
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setAlertDialogMessage(errorMessage);
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setIsLoginError(false);
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setIsAlertDialogOpen(true);
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}
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} finally {
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setIsRequestingCTokens(false);
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}
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};
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if (!isTestnet) {
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return null;
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}
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return (
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<>
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<AlertDialog open={isAlertDialogOpen} onOpenChange={setIsAlertDialogOpen}>
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<AlertDialogContent>
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<AlertDialogHeader>
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<AlertDialogTitle>{alertDialogTitle}</AlertDialogTitle>
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<AlertDialogDescription>
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{alertDialogMessage}
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</AlertDialogDescription>
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</AlertDialogHeader>
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<AlertDialogFooter className="flex gap-2">
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{isLoginError ? (
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<>
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<AlertDialogAction
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onClick={handleLogin}
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className="bg-blue-500 hover:bg-blue-600"
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>
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Login
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</AlertDialogAction>
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<AlertDialogAction className="bg-zinc-200 hover:bg-zinc-300 text-zinc-800">
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Close
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</AlertDialogAction>
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</>
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) : (
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<AlertDialogAction>OK</AlertDialogAction>
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)}
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</AlertDialogFooter>
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</AlertDialogContent>
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</AlertDialog>
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<button
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onClick={handleCChainTokenRequest}
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disabled={isRequestingCTokens}
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className={`px-2 py-1 text-xs font-medium text-white rounded transition-colors ${
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cChainBalance < LOW_BALANCE_THRESHOLD
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? "bg-blue-500 hover:bg-blue-600 shimmer"
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: "bg-zinc-600 hover:bg-zinc-700"
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} ${isRequestingCTokens ? "opacity-50 cursor-not-allowed" : ""}`}
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title="Get free C-Chain AVAX"
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>
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{isRequestingCTokens ? "Requesting..." : "Faucet"}
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</button>
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</>
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);
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};

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