英文:
How to iterate over the decoded claims of a Jwt token in Go?
问题
我正在参考这篇帖子（https://stackoverflow.com/questions/45405626/how-to-decode-a-jwt-token-in-go）来获取Jwt令牌的声明字段。以下是我根据这篇帖子使用的代码：
tokenString := "<YOUR TOKEN STRING>"claims := jwt.MapClaims{}token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {return []byte("<YOUR VERIFICATION KEY>"), nil})// ... 错误处理// 处理解码后的声明for key, val := range claims {fmt.Printf("Key: %v, value: %v\n", key, val)}
我成功获取了这些声明及其值。然而，在这个Jwt令牌中，有一个称为'scope'的声明字段，它具有字符串数组值，如'['openId'，'username'，'email']。
现在我想使用循环遍历这些值。
for _, v := range claims["scope"] {fmt.Println(v)}
然而，当我尝试循环遍历这个claims["scope"]时，我收到了一个错误消息：
"cannot range over claims["scope"] (type interface {})"
如何遍历这些claims["scope"]的值？另外，是否可以将其转换为其他形式，比如字符串数组或JSON，以便进行遍历？
谢谢。
英文:
I am referring to this post (https://stackoverflow.com/questions/45405626/how-to-decode-a-jwt-token-in-go) to get the claim fields of a Jwt token. Here are the code that I used based on this post:
tokenString := "<YOUR TOKEN STRING>"claims := jwt.MapClaims{}token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {return []byte("<YOUR VERIFICATION KEY>"), nil})// ... error handling// do something with decoded claimsfor key, val := range claims {fmt.Printf("Key: %v, value: %v\n", key, val)}
I managed to get those claims and its values. However, in this Jwt token, there is a claim field called 'scope', and it has a string array values, like '['openId','username','email'].
Now I want to iterate over these values using loop.
for _, v := range claims["scope"]{fmt.Println(v)}
However, when I try to loop over this claims ["scope"], I got an error message saying that:
> "cannot range over claims["scope"] (type interface {})".
How to iterate over these claims["scope"] values? Also, is it possible to convert it to other forms, like string array or json, to iterate over it?
Thanks.
答案1
得分: 2
有几种方法可以处理这个问题；最简单的方法可能是让库为您解码（playground）
type MyCustomClaims struct {Scope []string `json:"scope"`jwt.StandardClaims}claims := MyCustomClaims{}_, err := jwt.ParseWithClaims(tokenString, &claims, func(token *jwt.Token) (interface{}, error) {return []byte(sharedKey), nil})if err != nil {panic(err)}for _, s := range claims.Scope {fmt.Printf("%s\n", s)}
如果您想坚持使用您问题中使用的方法，那么您需要使用类型断言（playground - 有关更多信息，请参阅json文档）：
var claims jwt.MapClaims_, err := jwt.ParseWithClaims(tokenString, &claims, func(token *jwt.Token) (interface{}, error) {return []byte(sharedKey), nil})if err != nil {panic(err)}scope := claims["scope"]if scope == nil {panic("no scope")}scopeSlc, ok := scope.([]interface{})if !ok {panic("scope not a slice")}for _, s := range scopeSlc {sStr, ok := s.(string)if !ok {panic("slice member not a string")}fmt.Println(sStr)}
英文:
There are a few ways you can handle this; the simplest is probably to let the library decode things for you (playground)
type MyCustomClaims struct {Scope []string `json:"scope"`jwt.StandardClaims}claims := MyCustomClaims{}_, err := jwt.ParseWithClaims(tokenString, &claims, func(token *jwt.Token) (interface{}, error) {return []byte(sharedKey), nil})if err != nil {panic(err)}for _, s := range claims.Scope {fmt.Printf("%s\n", s)}
If you want to stick with the approach used in your question then you will need to use type assertions (playground - see the json docs for more info on this):
var claims jwt.MapClaims_, err := jwt.ParseWithClaims(tokenString, &claims, func(token *jwt.Token) (interface{}, error) {return []byte(sharedKey), nil})if err != nil {panic(err)}scope := claims["scope"]if scope == nil {panic("no scope")}scopeSlc, ok := scope.([]any)if !ok {panic("scope not a slice")}for _, s := range scopeSlc {sStr, ok := s.(string)if !ok {panic("slice member not a string")}fmt.Println(sStr)}
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