英文:
parsing strings and substrings
问题
我正在尝试解码（而不是验证）一个JWT令牌并从其主体中读取值。而且我的代码部分还处理非JWT令牌。因此，我需要处理普通令牌（比如某个字符串）和JWT令牌。
为了实现这一目标，我使用“.”来拆分令牌以读取JWT主体的值，但问题是当我获取非JWT令牌（没有“.”）时会出现“索引超出范围”的问题。
以下是代码示例：
package main
import (
"fmt"
"strings"
"encoding/base64"
"encoding/json"
)
func main() {
token := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ"
//nonJwtToken := "xxxxxxx"
// 如果传递了非JWT令牌，下面的代码应该优雅地抛出错误
data, err := base64.RawURLEncoding.DecodeString(strings.Trim(strings.Split(token, ".")[1], "."))
if err !=nil {
fmt.Printf("error: ", err)
}
var result map[string]interface{}
err = json.Unmarshal(data, &result)
fmt.Println(result["name"])
fmt.Println(err)
}
请注意，我不是在尝试验证JWT，我只是解码JWT并从中读取值。
对此有任何建议将不胜感激。
英文:
I am trying to decode(not validate) a JWT token and read values from its body. And this part of my code also deals with non JWT tokens. So I need to handle both normal tokens (lets say some string) and JWT tokens.
To achieve that, I am splitting token with "." to read JWT body values, but the problem is "index out of range" when I get non JWT tokens(no '.'s)
package main
import (
"fmt"
"strings"
"encoding/base64"
"encoding/json"
)
func main() {
token := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWV9.TJVA95OrM7E2cBab30RMHrHDcEfxjoYZgeFONFh7HgQ"
//nonJwtToken := "xxxxxxx"
// below line should gracefull throw error if it passed nonJwtToken
data, err := base64.RawURLEncoding.DecodeString(strings.Trim(strings.Split(token, ".")[1], "."))
if err !=nil {
fmt.Printf("error rahu : " , err)
}
var result map[string]interface{}
err = json.Unmarshal(data, &result)
fmt.Println(result["name"])
fmt.Println(err)
}
Note that I am not trying to validate JWT, all I am doing is just decoding JWT and reading values from it.
Any suggestions on this would be greatly appreciated.
答案1
得分: 0
根据@RayfenWindspear的评论中提到的，你应该检查Split返回的切片的长度，另外，你不需要从一个以“.”分割的字符串中去掉“.”，因为结果中已经省略了点号。
ts := strings.Split(token, ".")
if len(ts) <= 1 {
return ErrNonJWTToken
}
data, err := base64.RawURLEncoding.DecodeString(ts[1])
https://play.golang.org/p/NPw7dnBTsh
英文:
As mentioned in the comment by @RayfenWindspear you should check the length of the slice returned by Split, also you don't need to Trim "." from a string that's the result of a split on "." as the dots are omitted from the result.
ts := strings.Split(token, ".")
if len(ts) <= 1 {
return ErrNonJWTToken
}
data, err := base64.RawURLEncoding.DecodeString(ts[1])
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