如何从授权标头中提取JWT

Question

I have a curl request as such:

curl -XPOST -H 'Content-Type: application/json' -H 'Authorization: sso-jwt JWT_STRING' http://localhost:50051/doSomething -d '{"note": "Here's a note"}'

I'm using echo.Context to parse this request. I require extracting the Common Name(CN) from the JWT_STRING. This is how far I've got:

tokenString, err := request.HeaderExtractor{"Authorization"}.ExtractToken(c.Request())
    if err == nil {
        fmt.Println(tokenString)
    } else {
        fmt.Println(err)
    }

The above prints:

sso-jwt JWT_STRING whereas I want JWT_STRING.

Is there a way to achieve this in a better way? (Besides using string manipulation to extract only JWT_STRING).

This code lies inside my handler func which has the following signature: func (lock *Lock) DoSomething(c echo.Context) error {}

EDIT

The following works for me:

reqToken := c.Request().Header.Get("Authorization")
splitToken := strings.Split(reqToken, "sso-jwt ")
reqToken = splitToken[1]
fmt.Println(reqToken)

However, is it the best way to achieve this?

Answer 1

The most trivial way to achieve this is to use the strings.TrimPrefix function as follows:

token := strings.TrimPrefix(c.Request().Header.Get("Authorization"), "sso-jwt ")

This is normal and usually apart of the process I use to deal with retrieving Bearer JWTs in authentication middleware.