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main.go
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main.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"os"
"strings"
jwtmiddleware "github.com/auth0/go-jwt-middleware"
"github.com/codegangsta/negroni"
jwt "github.com/dgrijalva/jwt-go"
"github.com/gorilla/mux"
"github.com/joho/godotenv"
"github.com/rs/cors"
)
type Response struct {
Message string `json:"message"`
}
type Jwks struct {
Keys []JSONWebKeys `json:"keys"`
}
type JSONWebKeys struct {
Kty string `json:"kty"`
Kid string `json:"kid"`
Use string `json:"use"`
N string `json:"n"`
E string `json:"e"`
X5c []string `json:"x5c"`
}
func main() {
err := godotenv.Load()
if err != nil {
log.Print("Error loading .env file")
}
jwtMiddleware := jwtmiddleware.New(jwtmiddleware.Options{
ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
aud := os.Getenv("AUDIENCE")
checkAud := token.Claims.(jwt.MapClaims).VerifyAudience(aud, false)
if !checkAud {
return token, errors.New("Invalid audience.")
}
iss := "https://" + os.Getenv("DOMAIN") + "/"
checkIss := token.Claims.(jwt.MapClaims).VerifyIssuer(iss, false)
if !checkIss {
return token, errors.New("Invalid issuer.")
}
cert, err := getPemCert(token)
if err != nil {
panic(err.Error())
}
result, _ := jwt.ParseRSAPublicKeyFromPEM([]byte(cert))
return result, nil
},
SigningMethod: jwt.SigningMethodRS256,
})
c := cors.New(cors.Options{
AllowedOrigins: []string{"http://localhost:3000"},
AllowCredentials: true,
AllowedHeaders: []string{"Authorization"},
})
r := mux.NewRouter()
r.Handle("/api/public", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
message := "Hello from a public endpoint! You don't need to be authenticated to see this."
responseJSON(message, w, http.StatusOK)
}))
r.Handle("/api/private", negroni.New(
negroni.HandlerFunc(jwtMiddleware.HandlerWithNext),
negroni.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
message := "Hello from a private endpoint! You need to be authenticated to see this."
responseJSON(message, w, http.StatusOK)
}))))
r.Handle("/api/private-scoped", negroni.New(
negroni.HandlerFunc(jwtMiddleware.HandlerWithNext),
negroni.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
authHeaderParts := strings.Split(r.Header.Get("Authorization"), " ")
token := authHeaderParts[1]
hasScope := checkScope("read:messages", token)
if !hasScope {
message := "Insufficient scope."
responseJSON(message, w, http.StatusForbidden)
return
}
message := "Hello from a private endpoint! You need to be authenticated to see this."
responseJSON(message, w, http.StatusOK)
}))))
handler := c.Handler(r)
http.Handle("/", r)
fmt.Println("Listening on http://localhost:3010")
http.ListenAndServe("0.0.0.0:3010", handler)
}
type CustomClaims struct {
Scope string `json:"scope"`
jwt.StandardClaims
}
func checkScope(scope string, tokenString string) bool {
token, _ := jwt.ParseWithClaims(tokenString, &CustomClaims{}, nil)
claims, _ := token.Claims.(*CustomClaims)
hasScope := false
result := strings.Split(claims.Scope, " ")
for i := range result {
if result[i] == scope {
hasScope = true
}
}
return hasScope
}
func getPemCert(token *jwt.Token) (string, error) {
cert := ""
resp, err := http.Get("https://" + os.Getenv("DOMAIN") + "/.well-known/jwks.json")
if err != nil {
return cert, err
}
defer resp.Body.Close()
var jwks = Jwks{}
err = json.NewDecoder(resp.Body).Decode(&jwks)
if err != nil {
return cert, err
}
for k, _ := range jwks.Keys {
if token.Header["kid"] == jwks.Keys[k].Kid {
cert = "-----BEGIN CERTIFICATE-----\n" + jwks.Keys[k].X5c[0] + "\n-----END CERTIFICATE-----"
}
}
if cert == "" {
err := errors.New("Unable to find appropriate key.")
return cert, err
}
return cert, nil
}
func responseJSON(message string, w http.ResponseWriter, statusCode int) {
response := Response{message}
jsonResponse, err := json.Marshal(response)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(statusCode)
w.Write(jsonResponse)
}