问题内容
我正在开发一个控制面板，并雇用了一些人来为我构建它。他们都逃走了，我只剩下清理意大利面了。
我需要做的是：
- 拉出登录页面
- 检查登录信息和发布表单
- 发布成功后，重定向至仪表板页面
只是一个简单的登录过程。问题是，当登录成功时，控制台进入此重定向循环，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"
现在，由于我正在填补老开发人员的空缺，所以我仍在学习/golang 和 gin 的新手，所以对我来说，这只是裸露的......
立即学习“go语言免费学习笔记（深入）”；
据我了解，main()正在配置路由、中间件、加载模板然后运行引擎。
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)
}
当访问 / 时，我会被重定向到 /login，这会弹出登录表单。
我使用有效凭据提交表单，它会将我重定向到 /dashboard。我不知道成功登录后重定向是否正确，这就是原始开发人员所做的并且工作正常。
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")
}
然后，应该加载 /dashboard 页面。
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 代码中，我省略了将数据拉入仪表板的代码，因为它很长，并且认为没有必要。）
- 我已经注释掉了dashboard.go 中的所有数据查询，并添加了一个简单的“hi”响应，但它仍然进行了重定向外观。所以，我知道这个 gofile 提取数据的方式没有任何问题。
- 我尝试使用不同的 http 响应代码，例如
http.statusok并且没有骰子。 - 我在dashboard.go中验证了会话数据确实正在写入和保存。当加载仪表板 get 处理函数时，我能够输出会话数据。所以，我知道会话运行良好。
- 我更改了处理程序的编写方式。以前，它的编码如下：
func DashboardGetHandler() gin.HandlerFunc {
return func(context *gin.Context) {
[...]
}
}
我完全没有想法，不知道接下来该去哪里。谢谢！
正确答案
感谢所有提供帮助的人。我与前任开发人员取得了联系，他帮助我找出了问题所在。
在他的代码中，他创建了一个中间件函数，由于某种原因，该函数再次检查会话。那段代码正在检查会话 cookie 中不存在的旧变量。因此，我被踢回登录屏幕。
因此，我所做的就是删除该中间件，因为无论如何我都是在 login.go 中处理该中间件。
