golang gorilla/session 在检查会话时得到了空值。

huangapple
go评论116阅读模式
英文:

golang gorilla/session got nil value while checking session

问题

我已经导入了以下包：

  1. import (
  2.     "github.com/gorilla/sessions"
  3.     "github.com/gorilla/mux"
  5.     //CORS
  6.     "github.com/rs/cors"
  7.     "github.com/justinas/alice"  
  8. )

并定义了存储和主要方法如下：

  1. var store = sessions.NewCookieStore([]byte("something-very-secret")) 
  3. const My_UI = "http://localhost:3000"
  5. func init() {
  6.     store.Options = &sessions.Options{
  7.         Path:     "/",
  8.         MaxAge:   3600 * 1, // 1 hour
  9.         HttpOnly: true,
  10.     }
  11. }
  13. var router = mux.NewRouter() //MUX Handeler
  15. //MAIN Function
  17. func main() {
  18.     c := cors.New(cors.Options{
  19.         AllowedOrigins: []string{My_UI},
  20.     })
  22.     router.HandleFunc("/submitted", Login)
  23.     router.HandleFunc("/check", GetSession)
  24.     http.Handle("/", router)
  26.     chain := alice.New(c.Handler).Then(router) //CORS enable
  28.     fmt.Println("server started at port 8080")
  29.     http.ListenAndServe(":8080", chain)
  30. }

在我的方法中，我按照gorilla文档中的描述创建并设置了会话值：

  1. func Login(w http.ResponseWriter, r *http.Request) {     
  2.     fmt.Println("In login---------->")
  3.     sess := GetCon()                              //get connection session
  4.     defer sess.Close()                             //close session    
  5.     c := sess.DB("mydb").C("users")         //collection-> select db table
  7.     session1, _ := store.Get(r, "loginSession")  //login session
  9.     //parse json data  
  10.     form := LoginUser{}
  11.     err := json.NewDecoder(r.Body).Decode(&form)
  12.     if err !=nil {
  13.         fmt.Println(err)
  14.     }
  16.     //get query data
  17.     var result []Person
  19.     errc1 := c.Find(bson.M{"email":form.Email,"password":form.Password}).All(&result)
  20.         
  21.     if errc1 != nil {
  22.         js, err2 := json.Marshal("false")
  23.         if err2 != nil{return}
  24.         w.Header().Set("Content-Type", "application/json")
  25.         w.Write(js)        
  26.     } else {
  27.         if len(result)==0 {
  28.             if err2 != nil {
  29.                 return
  30.             }
  31.             w.Header().Set("Content-Type", "application/json")
  32.             w.Write(js)    
  33.         } else {
  34.             fmt.Println("Success")    
  35.             session1.Values["foo"] = "bar"  
  36.             session1.Save(r, w) 
  37.             fmt.Println("saved",session1)
  38.             js, err2 := json.Marshal(&result[0].Id)
  39.             if err2 != nil {return}
  40.             w.Header().Set("Content-Type", "application/json")
  41.             w.Write(js)    
  42.         }        
  43.     }   
  44. }

现在，如果我想在另一个方法中获取这个会话值，每次都得到nil。不知道我的代码出了什么问题。

  1. func GetSession(w http.ResponseWriter, r *http.Request) {
  2.     session1, _ := store.Get(r, "loginSession")
  3.     fmt.Println("Session in SessionHandler", session1)
  5.     if session.Values["foo"] == nil {
  6.         fmt.Println("not found", session.Values["foo"])
  7.     } else {
  8.         fmt.Println("value", session.Values["foo"])
  9.     }
  10. }
英文:

I have imported packages as

  1. import (
  2. "github.com/gorilla/sessions"
  3. "github.com/gorilla/mux"
  4. //CORS
  5. "github.com/rs/cors"
  6. "github.com/justinas/alice"  
  7. )

and defined store and main method as follow

  1. var store = sessions.NewCookieStore([]byte("something-very-secret")) 
  2. const My_UI="http://localhost:3000"
  3. func init() {
  4. store.Options = &sessions.Options{
  5. Path:     "/",
  6. MaxAge:   3600 * 1, // 1 hour
  7. HttpOnly: true,
  8. }
  9. }
  10. var router = mux.NewRouter() //MUX Handeler
  11. //MAIN Function
  12. func main() {
  13. c := cors.New(cors.Options{
  14. AllowedOrigins: []string{My_UI},
  15. })
  16. router.HandleFunc("/submitted",Login)
  17. router.HandleFunc("/check",GetSession)
  18. http.Handle("/", router)
  19. chain := alice.New(c.Handler).Then(router) //CORS enable
  20. fmt.Println("server started at port 8080")
  21. http.ListenAndServe(":8080", chain)
  22. }

In my method I’ve created and set session value as describe in gorilla doc

  1. func Login(w http.ResponseWriter, r *http.Request) {	     
  2. fmt.Println("In login----------->")
  3. sess := GetCon()                              //get connection session
  4. defer sess.Close() 							 //close session 	
  5. c := sess.DB("mydb").C("users")		 //collection-> select db table
  6. session1, _ := store.Get(r, "loginSession")  //login session
  7. //parse json data  
  8. form := LoginUser{}
  9. err := json.NewDecoder(r.Body).Decode(&form)
  10. if err !=nil {
  11. fmt.Println(err)
  12. }
  13. //get query data
  14. var result []Person
  15. errc1 := c.Find(bson.M{"email":form.Email,"password":form.Password}).All(&result)
  16. if errc1 != nil {
  17. js, err2 := json.Marshal("false")
  18. if err2 != nil{return}
  19. w.Header().Set("Content-Type", "application/json")
  20. w.Write(js)		
  21. } else {
  22. if len(result)==0 {
  23. if err2 != nil {
  24. return
  25. }
  26. w.Header().Set("Content-Type", "application/json")
  27. w.Write(js)	
  28. } else {
  29. fmt.Println("Success")	
  30. session1.Values["foo"] = "bar"  
  31. session1.Save(r, w) 
  32. fmt.Println("saved",session1)
  33. js, err2 := json.Marshal(&result[0].Id)
  34. if err2 != nil {return}
  35. w.Header().Set("Content-Type", "application/json")
  36. w.Write(js)	
  37. }		
  38. }	
  39. }

Now if i want to get this session value in another method i got nil every time. don't know what goes wrong in my code.

  1. func GetSession(w http.ResponseWriter, r *http.Request) {
  2. session1, _ := store.Get(r, "loginSession")
  3. fmt.Println("Session in SessionHandler",session1)
  4. if session.Values["foo"] == nil {
  5. fmt.Println("not found",session.Values["foo"]))
  6. } else {
  7. fmt.Println("value",session.Values["foo"])
  8. }
  9. }

答案1

得分: 2

你在GetSession函数中有一个错误。请将session变量更改为session1。

另外，为了检查session值是否存在，最好按照以下方式进行：

  1. session, err := store.Get(r, ssid)
  2. if err == nil {
  3.     if value, ok := session.Values["foo"].(string); ok {
  4.         session_data = value
  5.     }
  6. }
英文:

You got a mistake at your GetSession function. Please change session variable to session1

Also to check if session value is present better do it this way:

  1. session, err := store.Get(r, ssid)
  2. if err == nil {
  3. if value, ok := session.Values["foo"].(string); ok {
  4. session_data = value
  5. }
  6. }

答案2

得分: 1

我不知道你想要获取什么值，但我假设你想要一个字符串值。我编写了一个简单的 func GetFoo() 函数，用于从 session1.Values["foo"] 中获取字符串值。

完整的示例代码如下：

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"net/http"
  7. 	"github.com/gorilla/mux"
  8. 	"github.com/gorilla/sessions"
  9. 	"github.com/justinas/alice"
  10. 	"github.com/rs/cors"
  11. )
  13. var store = sessions.NewCookieStore([]byte("something-very-secret"))
  15. const My_UI = "http://localhost:3000"
  17. var router = mux.NewRouter() //MUX Handeler
  19. //MAIN Function
  20. func init() {
  21. 	store.Options = &sessions.Options{
  22. 		Path:     "/",
  23. 		MaxAge:   3600 * 1, // 1 hour
  24. 		HttpOnly: true,
  25. 	}
  26. }
  28. func main() {
  29. 	c := cors.New(cors.Options{
  30. 		AllowedOrigins: []string{My_UI},
  31. 	})
  32. 	router.HandleFunc("/login", Login)
  33. 	router.HandleFunc("/check", GetSession)
  34. 	http.Handle("/", router)
  35. 	chain := alice.New(c.Handler).Then(router) //CORS enable
  36. 	fmt.Println("server started at port 8080")
  37. 	http.ListenAndServe(":8080", chain)
  38. }
  40. func GetFoo(f interface{}) string {
  41. 	if f != nil {
  42. 		if foo, ok := f.(string); ok {
  43. 			return foo
  44. 		}
  45. 	}
  46. 	return ""
  47. }
  49. func GetSession(w http.ResponseWriter, r *http.Request) {
  50. 	session1, _ := store.Get(r, "loginSession")
  51. 	foo := GetFoo(session1.Values["foo"])
  52. 	if foo == "" {
  53. 		fmt.Println("Foo is not set! Login to set value.")
  54. 	} else {
  55. 		fmt.Println("Foo Value:", foo, ".")
  56. 	}
  57. }
  59. func Login(w http.ResponseWriter, r *http.Request) {
  60. 	// Save Foo
  61. 	session1, _ := store.Get(r, "loginSession")
  62. 	session1.Values["foo"] = "bar"
  63. 	session1.Save(r, w)
  64. }

请注意，这只是一个代码示例，你可能需要根据自己的需求进行修改。

英文:

I don't know what value you what to get, but I assume you want a string value. I wrote simple func GetFoo() to get string value from session1.Values["foo"].

Full example below:

  1. package main
  2. import (
  3. "fmt"
  4. "net/http"
  5. "github.com/gorilla/mux"
  6. "github.com/gorilla/sessions"
  7. "github.com/justinas/alice"
  8. "github.com/rs/cors"
  9. )
  10. var store = sessions.NewCookieStore([]byte("something-very-secret"))
  11. const My_UI = "http://localhost:3000"
  12. var router = mux.NewRouter() //MUX Handeler
  13. //MAIN Function
  14. func init() {
  15. store.Options = &sessions.Options{
  16. Path:     "/",
  17. MaxAge:   3600 * 1, // 1 hour
  18. HttpOnly: true,
  19. }
  20. }
  21. func main() {
  22. c := cors.New(cors.Options{
  23. AllowedOrigins: []string{My_UI},
  24. })
  25. router.HandleFunc("/login", Login)
  26. router.HandleFunc("/check", GetSession)
  27. http.Handle("/", router)
  28. chain := alice.New(c.Handler).Then(router) //CORS enable
  29. fmt.Println("server started at port 8080")
  30. http.ListenAndServe(":8080", chain)
  31. }
  32. func GetFoo(f interface{}) string {
  33. if f != nil {
  34. if foo, ok := f.(string); ok {
  35. return foo
  36. }
  37. }
  38. return ""
  39. }
  40. func GetSession(w http.ResponseWriter, r *http.Request) {
  41. session1, _ := store.Get(r, "loginSession")
  42. foo := GetFoo(session1.Values["foo"])
  43. if foo == "" {
  44. fmt.Println("Foo is not set! Login to set value.")
  45. } else {
  46. fmt.Println("Foo Value:", foo, ".")
  47. }
  48. }
  49. func Login(w http.ResponseWriter, r *http.Request) {
  50. // Save Foo
  51. session1, _ := store.Get(r, "loginSession")
  52. session1.Values["foo"] = "bar"
  53. session1.Save(r, w)
  54. }

huangapple
  • 本文由 发表于 2015年4月8日 19:07:47
  • 转载请务必保留本文链接：https://go.coder-hub.com/29512914.html
  • go
  • gorilla
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