MetaMask SDKをNext.jsで実装する方法

npx create-next-app@latest
✔ What is your project named? … next-metamask-template
✔ Would you like to use TypeScript? … No / Yes
✔ Would you like to use ESLint? … No / Yes
✔ Would you like to use Tailwind CSS? … No / Yes
✔ Would you like to use `src/` directory? … No / Yes
✔ Would you like to use App Router? (recommended) … No / Yes
✔ Would you like to customize the default import alias (@/*)? … No / Yes
コピー

Would you like to use TypeScript (recommended)? no / yes
Which style would you like to use? › Default
Which color would you like to use as base color? › Slate
Where is your global CSS file? › › app/globals.css
Do you want to use CSS variables for colors? › no / yes
Where is your tailwind.config.js located? › tailwind.config.js
Configure the import alias for components: › @/components
Configure the import alias for utils: › @/lib/utils
Are you using React Server Components? › no / yes
コピー

"use client";

import Link from "next/link";

import WalletIcon from "../public/icons/WalletIcon";

import { Button } from "./ui/button";

import { useSDK, MetaMaskProvider } from "@metamask/sdk-react";
import { formatAddress } from "../lib/utils";
import {
  Popover,
  PopoverTrigger,
  PopoverContent,
} from "@/components/ui/popover";

export const ConnectWalletButton = () => {
  const { sdk, connected, connecting, account } = useSDK();

  const connect = async () => {
    try {
      await sdk?.connect();
    } catch (err) {
      console.warn(`No accounts found`, err);
    }
  };

  const disconnect = () => {
    if (sdk) {
      sdk.terminate();
    }
  };

  return (
    <div className="relative">
      {connected ? (
        <Popover>
          <PopoverTrigger>
            <Button>{formatAddress(account)}</Button>
          </PopoverTrigger>
          <PopoverContent className="mt-2 w-44 bg-gray-100 border rounded-md shadow-lg right-0 z-10 top-10">
            
              Disconnect
            
          </PopoverContent>
        </Popover>
      ) : (
        <Button disabled={connecting} onClick={connect}>
          <WalletIcon className="mr-2 h-4 w-4" /> Connect Wallet
        </Button>
      )}
    </div>
  );
};
コピー

export const NavBar = () => {
  const host =
    typeof window !== "undefined" ? window.location.host : "defaultHost";

  const sdkOptions = {
    logging: { developerMode: false },
    checkInstallationImmediately: false,
    dappMetadata: {
      name: "Next-Metamask-Boilerplate",
      url: host, // using the host constant defined above
    },
  };

  return (
    <nav className="flex items-center justify-between max-w-screen-xl px-6 mx-auto py-7 rounded-xl">
      <Link href="/" className="flex gap-1 px-6">
        <span className="hidden text-2xl font-bold sm:block">
          <span className="text-gray-900">Template</span>
        </span>
      </Link>
      <div className="flex gap-4 px-6">
        <MetaMaskProvider debug={false} sdkOptions={sdkOptions}>
          <ConnectWalletButton />
        </MetaMaskProvider>
      </div>
    </nav>
  );
};

export default NavBar;
コピー

import { clsx, type ClassValue } from "clsx";
import { twMerge } from "tailwind-merge";

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}
コピー

export const formatBalance = (rawBalance: string) => {
  const balance = (parseInt(rawBalance) / 1000000000000000000).toFixed(2);
  return balance;
};

export const formatChainAsNum = (chainIdHex: string) => {
  const chainIdNum = parseInt(chainIdHex);
  return chainIdNum;
};

export const formatAddress = (addr: string | undefined) => {
  return `${addr?.substring(0, 8)}...`;
};
コピー