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.
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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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