alexcons alexcons - 3 years ago 216
reST (reStructuredText) Question

Mixed named and unnamed function parameters

I have this function for authenticating JWT tokens (not middleware), which says:

package main

import (
"net/http"
"log"
"fmt"
"github.com/dgrijalva/jwt-go"
)

func ValidateToken(w http.ResponseWriter, r *http.Request) *jwt.Token {

//parse token
token, err := jwt.ParseFromRequest(r, func(token *jwt.Token) (interface{}, err error) {
return VerifyKey, nil
})

//validate token
if err != nil {

switch err.(type) {

//something went wrong during validation
case *jwt.ValidationError:
vErr := err.(*jwt.ValidationError)

switch vErr.Errors {

case jwt.ValidationErrorExpired:
w.WriteHeader(http.StatusUnauthorized)
fmt.Fprintln(w, "Token expired")
return nil

default:
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintln(w, "Error parsing token")
log.Printf("Validation error: %v\n", err)
return nil
}


//something else went wrong
default:
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintln(w, "Error parsing token")
log.Printf("Validation error: %v\n", err)
return nil
}

}

return token

}


Then, in my handlers, I call this function to get the token and check if it is valid using the Valid property in the JWT Token struct. However, when I run the web server, I get an error on line 13, saying:

Mixed named and unnamed function parameters


Line 13 is the jwt.ParseFromRequest() call. Any thoughts on what I am doing wrong? I am new to Go.

Answer Source

You are defining a function inline (of type jwt.Keyfunc), but not binding it to anything. If VerifyKey is of type jwt.Keyfunc, then you can just change line 13 to

token, err := jwt.ParseFromRequest(r, VerifyKey)
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