go - oauth2 无法获取令牌：错误请求

Question

我编写了一个回调处理程序以使用 Google 帐户登录：

func GoogleCallbackHandler(w http.ResponseWriter, r *http.Request) {
    conf:=&oauth2.Config{
        ClientID:"700740834863-m4om9r91htn19htq2b6a05fu6vu4j7i5.apps.googleusercontent.com",
        ClientSecret:"...-rB",
        RedirectURL:"http://localhost:3000/auth/google/callback",
        Scopes:[]string{"profile"},
        Endpoint:google.Endpoint,
    }

    fmt.Println(conf.AuthCodeURL("state"))

    code := r.URL.Query().Get("code")

    token, err := conf.Exchange(oauth2.NoContext, code)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    client := conf.Client(oauth2.NoContext, token)
    resp, err := client.Get("https://www.googleapis.com/userinfo/v2/me")
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    raw, err := ioutil.ReadAll(resp.Body)
    defer resp.Body.Close()
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    var profile map[string]interface{}
    if err := json.Unmarshal(raw, &profile); err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    session, _ := util.GlobalSessions.SessionStart(w, r)
    defer session.SessionRelease(w)

    session.Set("id_token", token.Extra("id_token"))
    session.Set("access_token", token.AccessToken)
    session.Set("profile", profile)

    // // Redirect to logged in page

    http.Redirect(w, r, "/user", http.StatusMovedPermanently)
}

在main，我为处理程序提供服务

http.HandleFunc("/",route.IndexHandler)
http.HandleFunc("/auth/google/",route.GoogleCallbackHandler)
http.Handle("/user",negroni.New(
    negroni.HandlerFunc(route.IsAuthenticated),
    negroni.Wrap(http.HandlerFunc(route.UserHandler)),
))

我遇到了与旧问题相同的问题： oauth2 cannot fetch token: bad request

oauth2: cannot fetch token: 400 Bad Request
Response: {
  "error" : "invalid_request",
  "error_description" : "Missing required parameter: code"
}

上次我问了这个问题后，我设法用上面的代码修复了它，成功访问并获取数据，但是昨晚它突然又出现了这个错误，我不明白为什么它在上次之后不再工作几天使用完全相同的代码

如何从AuthCodeURL 获取code？有没有办法在不重定向到任何其他处理程序的情况下获取交换代码？我想在一个 this 处理程序中处理所有事情

Answer 1

我可以通过再添加一个处理程序来解决它

var (
    conf *oauth2.Config
)

func GoogleCallbackHandler(w http.ResponseWriter, r *http.Request) {
    conf=&oauth2.Config{
        ClientID:"700740834863-m4om9r91htn19htq2b6a05fu6vu4j7i5.apps.googleusercontent.com",
        ClientSecret:"...-rB",
        RedirectURL:"http://localhost:3000/auth/google/callback",
        Scopes:[]string{"profile"},
        Endpoint:google.Endpoint,
    }

    http.Redirect(w, r, conf.AuthCodeURL("state"), http.StatusMovedPermanently)
}

func GoogleLoginHandler(w http.ResponseWriter, r *http.Request) {
    code := r.URL.Query().Get("code")

    token, err := conf.Exchange(oauth2.NoContext, code)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    client := conf.Client(oauth2.NoContext, token)
    resp, err := client.Get("https://www.googleapis.com/userinfo/v2/me")
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    raw, err := ioutil.ReadAll(resp.Body)
    defer resp.Body.Close()
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    var profile map[string]interface{}
    if err := json.Unmarshal(raw, &profile); err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    session, _ := util.GlobalSessions.SessionStart(w, r)
    defer session.SessionRelease(w)

    session.Set("id_token", token.Extra("id_token"))
    session.Set("access_token", token.AccessToken)
    session.Set("profile", profile)

    http.Redirect(w, r, "/user", http.StatusMovedPermanently)
}