Golang Gin：標題已經寫好了。想要用 200 覆蓋狀態碼 301

問題內容

我正在開發一個控制面板，並僱用了一些人來為我建立它。他們都逃走了，我只剩下清理義大利麵了。

我需要做的是：

• 拉出登入頁面
• 檢查登入資訊和發佈表單
• 發布成功後，重新導向至儀表板頁面

只是一個簡單的登入過程。問題是，當登入成功時，控制台進入此重定向循環，如下所示：

[gin] 2023/02/21 - 15:43:32 | 301 |  1.224601041s |             ::1 | post     "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:33 | 200 |    787.3905ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:33 | 200 |  197.989875ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:34 | 200 |  817.293166ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:34 | 200 |  206.107791ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:35 | 200 |  792.954375ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:35 | 200 |  201.972708ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:36 | 200 |  840.773625ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:36 | 200 |  198.680125ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:37 | 200 |  897.679708ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:37 | 200 |  200.759917ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:38 | 200 |   795.39975ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:38 | 200 |     196.538ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:39 | 200 |  844.680709ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:39 | 200 |  180.598084ms |             ::1 | get      "/login"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:40 | 200 |  814.666208ms |             ::1 | get      "/dashboard"
[gin-debug] [warning] headers were already written. wanted to override status code 301 with 200
[gin] 2023/02/21 - 15:43:40 | 200 |     210.281ms |             ::1 | get      "/login"

現在，由於我正在填補老開發人員的空缺，所以我仍在學習/golang 和 gin 的新手，所以對我來說，這只是裸露的......

據我了解，main()正在設定路由、中間件、載入模板然後運行引擎。

main.go

func main() {
    //gin.setmode(gin.releasemode) // uncomment for production

    // startup tasks
    startup()
    logging.loginfo("ran startup tasks...")

    // configure engine
    hostport := fmt.sprintf(
        "%s:%d",
        datamanagers.loadconfig().bshost,
        datamanagers.loadconfig().bsport)
    webengine := gin.default()
    webengine.settrustedproxies([]string{hostport})
    logging.loginfo("configured engine...")

    // load middleware
    store := cookie.newstore([]byte(randstr.string(64)))
    webengine.use(sessions.sessions("session", store))
    webengine.use(errorhandler.errorshandler500())
    logging.loginfo("loaded middleware...")

    // configure routes
    pubroutes := webengine.group("/")
    privroutes := webengine.group("/")
    routes.publicroutes(pubroutes)
    privroutes.use(middleware.authrequired)
    routes.privateroutes(privroutes)
    logging.loginfo("configured routes...")

    // non routables
    webengine.noroute(errorhandler.errorshandler404())
    logging.loginfo("configured non-routables...")

    // load template files
    loadtemplates(webengine)
    logging.loginfo("loaded templates...")

    // start the gin engine
    err := webengine.run(hostport)
    logging.loginfo("...blocksuite-webui loaded")
    logging.catch(err)
}

當存取 / 時，我會被重新導向到 /login，這會彈出登入表單。

我使用有效憑證提交表單，它會將我重定向到 /dashboard。我不知道成功登入後重定向是否正確，這就是原始開發人員所做的並且工作正常。

routes.go

#

func publicroutes(webengine *gin.routergroup) {
    webengine.get("/login", entry.logingethandler)
    webengine.post("/login", entry.loginposthandler)
    webengine.get("/", other.indexgethandler())
}
func privateroutes(webengine *gin.routergroup) {
    dashboardroutes := webengine.group("/dashboard")
    {
        dashboardroutes.get("/", dashboard.dashboardgethandler)
    }
}

login.go

#

func logingethandler(context *gin.context) {
    user := utility.getusersession(context).get("useremail")
    if user != nil {
        context.redirect(http.statusmovedpermanently, "/dashboard")
    }
    context.html(http.statusok, "login.html", gin.h{
        "sitekey":    datamanagers.getrecaptchasettings().sitekey,
        "enabled":    datamanagers.getrecaptchasettings().enabled,
        "content":    "",
        "success":    "",
        "serverlogo": brand.getbrandlogo(),
        "title":      "welcome back",
    })
}
func loginposthandler(context *gin.context) {
    user := utility.getusersession(context).get("useremail")
    if user != nil {
        context.redirect(http.statusmovedpermanently, "/dashboard")
        //return
    }
    useremail := utility.sanitize(context.postform("email"))
    password := utility.sanitize(context.postform("password"))
    rememberme := utility.sanitize(context.postform("rememberme"))
    //captcha := context.postform("g-recaptcha-response")
    if !utility.isemailvalid(useremail) {
        context.html(http.statusbadrequest, "login.html", gin.h{"content": "please enter a valid email address"})
        return
    }
    /*if helpers2.recaptchacheck(captcha) || datamanagers.getconfig().sitekey != "" {
        // success
    } else {
        if datamanagers.getconfig().enabled {
            context.html(http.statusbadrequest, "login.html", gin.h{"content": "please verify captcha"})
            return
        }
    }*/
    if utility.emptyuserpass(useremail, password) {
        context.html(http.statusbadrequest, "login.html", gin.h{"content": "email and password cannot be empty"})
        return
    }

    if utility.checkforwhitespaces(useremail, password) != nil {
        context.html(http.statusbadrequest, "login.html", gin.h{"content": "username and password can't contain spaces"})
        return
    }
    if !utility.checkuserpass(useremail, password) {
        context.html(http.statusunauthorized, "login.html", gin.h{"content": "incorrect username or password"})
        return
    }
    utility.newusersession(context, useremail)
    if rememberme == "yes" {
        utility.setsessionage(context)
    }
    context.redirect(http.statusmovedpermanently, "/dashboard")
}

然後，應該要載入 /dashboard 頁面。

dashboard.go

#

func dashboardgethandler(context *gin.context) {
    user := utility.getusersession(context).get("useremail")
    db := datamanagers.getdb()
    if user == nil {
        context.redirect(http.statusmovedpermanently, "/login")
    }
    [...]
    context.html(http.statusok, "dashboard.html", gin.h{
        "info":       info,
        "imageurl":   utility.getimage(user),
        "serverlogo": brand.getbrandicon(),
        "title":      "dashboard",
        "servername": datamanagers.getserverinfo().servername,
    })
}

（在 dashboard.go 程式碼中，我省略了將資料拉入儀表板的程式碼，因為它很長，並且認為沒有必要。）

• 我已經註解掉了dashboard.go 中的所有資料查詢，並添加了一個簡單的「hi」回應，但它仍然進行了重定向外觀。所以，我知道這個 gofile 提取資料的方式沒有任何問題。
• 我嘗試使用不同的 http 回應程式碼，例如 http.statusok 並且沒有骰子。
• 我在dashboard.go中驗證了會話資料確實正在寫入和保存。當載入儀表板 get 處理函數時，我能夠輸出會話資料。所以，我知道會話運作良好。
• 我更改了處理程序的編寫方式。以前，它的編碼如下：

func DashboardGetHandler() gin.HandlerFunc {
    return func(context *gin.Context) {
    [...]
    }
}

我完全沒有想法，我不知道接下來該去哪裡。謝謝！

正確答案

感謝所有提供幫助的人。我與前任開發人員取得了聯繫，他幫助我找出了問題所在。

在他的程式碼中，他創建了一個中間件函數，由於某種原因，該函數再次檢查會話。那段程式碼正在檢查會話 cookie 中不存在的舊變數。因此，我被踢回登入畫面。

因此，我所做的就是刪除該中間件，因為無論如何我都是在 login.go 中處理該中間件。

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