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package main
import (
"io"
"log"
"net/http"
"strings"
restful "github.com/emicklei/go-restful/v3"
"github.com/golang-jwt/jwt/v4"
)
// This example shows how to create a (Route) Filter that performs a JWT HS512 authentication.
//
// GET http://localhost:8080/secret
// and use shared-token as a shared secret.
var (
sharedSecret = []byte("shared-token")
)
func main() {
ws := new(restful.WebService)
ws.Route(ws.GET("/secret").Filter(authJWT).To(secretJWT))
restful.Add(ws)
log.Fatal(http.ListenAndServe(":8080", nil))
}
func secretJWT(req *restful.Request, resp *restful.Response) {
io.WriteString(resp, "42")
}
func validJWT(authHeader string) bool {
if !strings.HasPrefix(authHeader, "JWT ") {
return false
}
jwtToken := strings.Split(authHeader, " ")
if len(jwtToken) < 2 {
return false
}
parts := strings.Split(jwtToken[1], ".")
err := jwt.SigningMethodHS512.Verify(strings.Join(parts[0:2], "."), parts[2], sharedSecret)
if err != nil {
return false
}
return true
}
func authJWT(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
authHeader := req.HeaderParameter("Authorization")
if !validJWT(authHeader) {
resp.WriteErrorString(401, "401: Not Authorized")
return
}
chain.ProcessFilter(req, resp)
}
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