Use EIP-4361 login method

src/api/users.ts

@@ -81,6 +81,28 @@ export async function getAccessToken(user: UserLoginForm): Promise<string> {
   }
 }
 
+export async function getAccessTokenEip4361(
+  message: string,
+  signature: string,
+): Promise<string> {
+  const url = `${BACKEND_URL}/oauth/token`
+  const tokenRequestData = {
+    grant_type: "eip4361",
+    message: message,
+    signature: signature,
+  }
+  const response = await http(url, {
+    method: "POST",
+    json: tokenRequestData,
+  })
+  const data = await response.json()
+  if (response.status !== 200) {
+    throw new Error(data.message)
+  } else {
+    return data.access_token
+  }
+}
+
 export async function getCurrentUser(authToken: string): Promise<User | null> {
   const url = `${BACKEND_URL}/api/v1/accounts/verify_credentials`
   const response = await http(url, { authToken })

src/utils/ethereum.ts

@@ -58,3 +58,33 @@ export async function getWalletSignature(
   }
   return signature
 }
+
+function generateRandomString(len: number): string {
+  const arr = new Uint8Array(len / 2)
+  window.crypto.getRandomValues(arr)
+  return Array.from(arr, (val) => val.toString(16).padStart(2, "0")).join("")
+}
+
+export async function createEip4361_SignedMessage(
+  signer: Signer,
+  domain: string,
+  statement: string,
+): Promise<{ message: string, signature: string }> {
+  const address = await signer.getAddress()
+  const uri = window.location.origin
+  const nonce = generateRandomString(16)
+  const issuedAt = new Date().toISOString()
+  const message = `${domain} wants you to sign in with your Ethereum account:
+${address}
+
+${statement}
+
+URI: ${uri}
+Version: 1
+Chain ID: 1
+Nonce: ${nonce}
+Issued At: ${issuedAt}`
+
+  const signature = await signer.signMessage(message)
+  return { message, signature }
+}

src/views/LandingPage.vue

@@ -53,12 +53,23 @@
 <script lang="ts">
 import { Options, Vue, setup } from "vue-class-component"
 
-import { createUser, getAccessToken, getCurrentUser } from "@/api/users"
+import {
+  createUser,
+  getAccessToken,
+  getAccessTokenEip4361,
+  getCurrentUser,
+} from "@/api/users"
 import { InstanceInfo } from "@/api/instance"
 import Loader from "@/components/Loader.vue"
 import { useInstanceInfo } from "@/store/instance"
 import { useCurrentUser } from "@/store/user"
-import { getWeb3Provider, getWalletAddress, getWalletSignature } from "@/utils/ethereum"
+import {
+  getWeb3Provider,
+  getWallet,
+  getWalletAddress,
+  getWalletSignature,
+  createEip4361_SignedMessage,
+} from "@/utils/ethereum"
 
 @Options({
   components: { Loader },
@@ -120,24 +131,24 @@ export default class LandingPage extends Vue {
 
   async login() {
     this.loginErrorMessage = null
-    const provider = getWeb3Provider()
-    if (!provider || !this.store.instance) {
+    if (!this.store.instance) {
       return
     }
+    const instanceHost = this.store.instance.uri
     const loginMessage = this.store.instance.login_message
-    const walletAddress = await getWalletAddress(provider)
-    if (!walletAddress) {
+    const signer = await getWallet()
+    if (!signer) {
       return
     }
-    const signature = await getWalletSignature(provider, walletAddress, loginMessage)
-    if (!signature) {
-      return
-    }
-    const loginData = { wallet_address: walletAddress, signature }
+    const { message, signature } = await createEip4361_SignedMessage(
+      signer,
+      instanceHost,
+      loginMessage,
+    )
     let user
     let authToken
     try {
-      authToken = await getAccessToken(loginData)
+      authToken = await getAccessTokenEip4361(message, signature)
       user = await getCurrentUser(authToken)
     } catch (error) {
       this.loginErrorMessage = error.message