/
middleware.go
68 lines (54 loc) · 1.55 KB
/
middleware.go
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package main
import (
"fmt"
"net/http"
"time"
jwt "github.com/dgrijalva/jwt-go"
)
// SigningKey returns unique signing key
func SigningKey() string {
return fmt.Sprintf("%d", macAddress())
}
// isAuthorized middleware check incoming HTTP request token
// and authorize the user based on SigningKey
func isAuthorized(endpoint func(http.ResponseWriter, *http.Request)) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Header["Token"] != nil {
token, err := jwt.Parse(r.Header["Token"][0], func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("There was an error")
}
return SigningKey(), nil
})
if err != nil {
fmt.Fprintf(w, err.Error())
}
if token.Valid {
endpoint(w, r)
}
} else {
fmt.Fprintf(w, "Not Authorized")
}
})
}
// GenerateJWT generates JWT token
// Client should use the following format to place HTTP request:
//
// token, err := GenerateJWT()
// client := &http.Client{}
// req, _ := http.NewRequest("GET", someURL, nil)
// req.Header.Set("Token", token)
//
func GenerateJWT() (string, error) {
token := jwt.New(jwt.SigningMethodHS256)
claims := token.Claims.(jwt.MapClaims)
claims["authorized"] = true
claims["client"] = "ECM client"
claims["exp"] = time.Now().Add(time.Minute * 30).Unix()
tokenString, err := token.SignedString(SigningKey())
if err != nil {
fmt.Errorf("Something Went Wrong: %s", err.Error())
return "", err
}
return tokenString, nil
}