使用 Ethereum 登录 (SIWE)
使用 Ethereum 登录 (SIWE) 插件允许用户按照 ERC-4361 标准 使用其 Ethereum 钱包进行身份验证。此插件通过允许您实现自己的消息验证和 nonce 生成逻辑来提供灵活性。
安装
添加服务器插件
将 SIWE 插件添加到您的 auth 配置中:
import { betterAuth } from "better-auth";
import { siwe } from "better-auth/plugins";
export const auth = betterAuth({
plugins: [
siwe({
domain: "example.com",
emailDomainName: "example.com", // optional
anonymous: false, // optional, default is true
getNonce: async () => {
// Implement your nonce generation logic here
return "your-secure-random-nonce";
},
verifyMessage: async (args) => {
// Implement your SIWE message verification logic here
// This should verify the signature against the message
return true; // return true if signature is valid
},
ensLookup: async (args) => {
// Optional: Implement ENS lookup for user names and avatars
return {
name: "user.eth",
avatar: "https://example.com/avatar.png"
};
},
}),
],
});迁移数据库
运行迁移或生成架构,以向数据库添加必要的字段和表。
npx @better-auth/cli migratenpx @better-auth/cli generate请参阅 架构 部分以手动添加字段。
添加客户端插件
import { createAuthClient } from "better-auth/client";
import { siweClient } from "better-auth/client/plugins";
export const authClient = createAuthClient({
plugins: [siweClient()],
});使用方法
生成 Nonce
在签署 SIWE 消息之前,您需要为钱包地址生成一个 nonce:
const { data, error } = await authClient.siwe.nonce({
walletAddress: "0x1234567890abcdef1234567890abcdef12345678",
chainId: 1, // optional for Ethereum mainnet, required for other chains. Defaults to 1
});
if (data) {
console.log("Nonce:", data.nonce);
}使用 Ethereum 登录
生成 nonce 并创建 SIWE 消息后,验证签名以进行身份验证:
const { data, error } = await authClient.siwe.verify({
message: "Your SIWE message string",
signature: "0x...", // The signature from the user's wallet
walletAddress: "0x1234567890abcdef1234567890abcdef12345678",
chainId: 1, // optional for Ethereum mainnet, required for other chains. Must match Chain ID in SIWE message
email: "user@example.com", // optional, required if anonymous is false
});
if (data) {
console.log("Authentication successful:", data.user);
}特定链示例
以下是不同区块链网络的示例:
// Ethereum 主网 (chainId 可以省略,默认值为 1)
const { data, error } = await authClient.siwe.verify({
message,
signature,
walletAddress,
// chainId: 1 (default)
});// Polygon (chainId 必需)
const { data, error } = await authClient.siwe.verify({
message,
signature,
walletAddress,
chainId: 137, // Required for Polygon
});// Arbitrum (chainId 必需)
const { data, error } = await authClient.siwe.verify({
message,
signature,
walletAddress,
chainId: 42161, // Required for Arbitrum
});// Base (chainId 必需)
const { data, error } = await authClient.siwe.verify({
message,
signature,
walletAddress,
chainId: 8453, // Required for Base
});chainId 必须与 SIWE 消息中指定的链 ID 匹配。如果消息的链 ID 与 chainId 参数不匹配,验证将失败并返回 401 错误。
配置选项
服务器选项
SIWE 插件接受以下配置选项:
- domain: 您的应用程序域名(用于 SIWE 消息生成,必需)
- emailDomainName: 当不使用匿名模式创建用户帐户时的电子邮件域名。默认为来自您的基本 URL 的域名
- anonymous: 是否允许无需电子邮件的匿名登录。默认为
true - getNonce: 为每次登录尝试生成唯一 nonce 的函数。您必须实现此函数以返回加密安全的随机字符串。必须返回
Promise<string> - verifyMessage: 验证已签署 SIWE 消息的函数。接收消息详细信息并应返回
Promise<boolean> - ensLookup: 可选函数,用于查询 Ethereum 地址的 ENS 名称和头像
客户端选项
SIWE 客户端插件不需要任何配置选项,但如果需要未来扩展性,您可以传递它们:
import { createAuthClient } from "better-auth/client";
import { siweClient } from "better-auth/client/plugins";
export const authClient = createAuthClient({
plugins: [
siweClient({
// Optional client configuration can go here
}),
],
});架构
SIWE 插件添加了一个 walletAddress 表来存储用户钱包关联:
| 字段 | 类型 | 描述 |
|---|---|---|
| id | string | 主键 |
| userId | string | 引用 user.id |
| address | string | Ethereum 钱包地址 |
| chainId | number | 链 ID(例如,Ethereum 主网为 1) |
| isPrimary | boolean | 是否为用户的主要钱包 |
| createdAt | date | 创建时间戳 |
示例实现
以下是一个完整的示例,展示如何实现 SIWE 身份验证:
import { betterAuth } from "better-auth";
import { siwe } from "better-auth/plugins";
import { generateRandomString } from "better-auth/crypto";
import { verifyMessage, createPublicClient, http } from "viem";
import { mainnet } from "viem/chains";
export const auth = betterAuth({
database: {
// your database configuration
},
plugins: [
siwe({
domain: "myapp.com",
emailDomainName: "myapp.com",
anonymous: false,
getNonce: async () => {
// Generate a cryptographically secure random nonce
return generateRandomString(32);
},
verifyMessage: async ({ message, signature, address }) => {
try {
// Verify the signature using viem (recommended)
const isValid = await verifyMessage({
address: address as `0x${string}`,
message,
signature: signature as `0x${string}`,
});
return isValid;
} catch (error) {
console.error("SIWE verification failed:", error);
return false;
}
},
ensLookup: async ({ walletAddress }) => {
try {
// Optional: lookup ENS name and avatar using viem
// You can use viem's ENS utilities here
const client = createPublicClient({
chain: mainnet,
transport: http(),
});
const ensName = await client.getEnsName({
address: walletAddress as `0x${string}`,
});
const ensAvatar = ensName
? await client.getEnsAvatar({
name: ensName,
})
: null;
return {
name: ensName || walletAddress,
avatar: ensAvatar || "",
};
} catch {
return {
name: walletAddress,
avatar: "",
};
}
},
}),
],
});