如何访问用户电子邮件而不需要访问用户的整个配置文件？
我在下面调用oauthConfig.Exchange后得到的tok似乎没有提供访问“ID令牌”的编程方式，即使我在作用域中包含“email”。

import (
  ...
  "github.com/gin-gonic/gin"
  "golang.org/x/oauth2"
  "golang.org/x/oauth2/google"
  "google.golang.org/api/gmail/v1",
  "google.golang.org/api/option"
)

var (
  ctx = context.Background()

  oauthConfig = &oauth2.Config{
    ClientID: ...,
    ClientSecret: ...,
    RedirectURL: ...,

    // ... but it looks like what I want is userinfo.email
    Scopes: [ "https://www.googleapis.com/auth/userinfo.profile" ],

    Endpoint: google.Endpoint,
  }
)

// Handler for the redirect URL.
func redirectHandler(c *gin.Context) {
  tok, _ := oauthConfig.Exchange(ctx, c.Query("code"))
  httpClient := oauthConfig.Client(ctx, tok)
  gmailService, _ := gmail.NewService(ctx, option.WithHTTPClient(httpClient)
  userProfile, _ := gmailService.Users.GetProfile("me").Do()

  // And now we have the user's email address
  // userProfile.EmailAddress
}

// Omitting main etc.

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