英文:
Is the Go Appengine tutorial missing LoginURL redirect statements?
问题
当我运行演示代码时，我没有被重定向到Google账号登录界面。
教程中提到：“请注意，如果用户未登录，则HTTP状态码302 Found会将浏览器重定向到Google账号登录界面。”
代码中似乎缺少一些内容，例如：
if u == nil {
url, _ := user.LoginURL(ctx, "/")
fmt.Fprintf(w, `<a href="%s">Sign in or register</a>`, url)
return
}
如果我理解有误，请问当前的代码是如何将用户重定向到登录界面的？
英文:
I'm not getting redirected to the Google account sign-in screen when I run the demo code.
https://cloud.google.com/appengine/docs/standard/go/getting-started/authenticating-users
The tutorial mentions: "Note that if the user is not signed in, an HTTP status code of 302 Found redirects the browser to the Google account sign-in screen."
func sign(w http.ResponseWriter, r *http.Request) {
// [START new_context]
c := appengine.NewContext(r)
// [END new_context]
g := Greeting{
Content: r.FormValue("content"),
Date: time.Now(),
}
// [START if_user]
if u := user.Current(c); u != nil {
g.Author = u.String()
}
key := datastore.NewIncompleteKey(c, "Greeting", guestbookKey(c))
_, err := datastore.Put(c, key, &g)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/", http.StatusFound)
// [END if_user]
}
Source code:
https://github.com/GoogleCloudPlatform/appengine-guestbook-go/blob/part4-usingdatastore/hello.go
It seems something is missing e.g.:
if u == nil {
url, _ := user.LoginURL(ctx, "/")
fmt.Fprintf(w, `<a href="%s">Sign in or register</a>`, url)
return
}
If I'm wrong, how does the current code redirect user to the sign-in screen?
答案1
得分: 1
你是正确的。要登录用户，你需要将他们重定向到上面的LoginURL。一旦用户访问此URL，应用引擎将允许他们使用他们的Google账号登录。
然而，你上面提供的示例代码并不要求用户登录。如果用户已登录，代码会获取他们的ID，并将其用作问候语的作者。如果没有登录，代码会将用户标记为匿名，如下模板所示：
{{with .Author}}
<p><b>{{.}}</b> 写道：</p>
{{else}}
<p>一个匿名人写道：</p>
{{end}}
英文:
You are correct. To log in a user, you'll have to redirect them to a LoginURL as above. Once a user accesses this URL, app engine will let them log in using their google account.
However, the example code you've linked above does not require a user to be logged in. If a user is logged in, the code gets their ID and uses that as the greeting's author. If not, it just calls the user anonymous, as per the template:
{{with .Author}}
<p><b>{{.}}</b> wrote:</p>
{{else}
<p>An anonymous person wrote:</p>
{{end}}
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