feat: add OAuth2 authentication (Google/GitHub/Discord)

src/services/users/oauth2/google/__utils__/utils.ts

@@ -0,0 +1,59 @@
+import querystring from 'node:querystring'
+
+import axios from 'axios'
+
+import { OAuthStrategy } from '../../../../../tools/utils/OAuthStrategy.js'
+
+export const GOOGLE_PROVIDER = 'google'
+export const GOOGLE_BASE_URL = 'https://accounts.google.com/o/oauth2/v2/auth'
+export const GOOGLE_OAUTH2_TOKEN = 'https://oauth2.googleapis.com/token'
+export const GOOGLE_USERINFO =
+  'https://www.googleapis.com/oauth2/v1/userinfo?alt=json'
+export const GOOGLE_CLIENT_ID =
+  process.env.GOOGLE_CLIENT_ID ?? 'GOOGLE_CLIENT_ID'
+export const GOOGLE_CLIENT_SECRET =
+  process.env.GOOGLE_CLIENT_SECRET ?? 'GOOGLE_CLIENT_SECRET'
+export const googleStrategy = new OAuthStrategy(GOOGLE_PROVIDER)
+
+export interface GoogleUser {
+  id: string
+  name: string
+  given_name: string
+  link: string
+  picture: string
+  locale: string
+}
+
+export interface GoogleTokens {
+  access_token: string
+  expires_in: number
+  token_type: string
+  scope: string
+  refresh_token?: string
+}
+
+export const getGoogleUserData = async (
+  code: string,
+  redirectURI: string
+): Promise<GoogleUser> => {
+  const { data: token } = await axios.post<GoogleTokens>(
+    GOOGLE_OAUTH2_TOKEN,
+    querystring.stringify({
+      client_id: GOOGLE_CLIENT_ID,
+      client_secret: GOOGLE_CLIENT_SECRET,
+      code,
+      redirect_uri: redirectURI,
+      grant_type: 'authorization_code'
+    }),
+    {
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+        Accept: 'application/json'
+      }
+    }
+  )
+  const { data: googleUser } = await axios.get<GoogleUser>(
+    `${GOOGLE_USERINFO}&access_token=${token.access_token}`
+  )
+  return googleUser
+}