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token.go
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token.go
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/*
Copyright 2023 Drew Viles.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package auth
import (
"encoding/json"
"fmt"
jwt "github.com/dgrijalva/jwt-go"
"github.com/drew-viles/go-web-framework/environment"
"github.com/google/uuid"
"log"
"net/http"
"strings"
"time"
)
// CreateToken Creates a JSON Web Token.
func CreateToken(hashID uuid.UUID) (string, error) {
claims := jwt.MapClaims{}
claims["authorized"] = true
claims["hash_id"] = hashID.String()
claims["expr"] = time.Now().Add(time.Hour * 1).Unix()
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString(environment.GetAPISecret())
}
// ExtractTokenUserID will extract the users id stored within the token
func ExtractTokenUserID(r *http.Request) (uuid.UUID, error) {
tokenString := extractToken(r)
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return environment.GetAPISecret(), nil
})
if err != nil {
return uuid.Nil, err
}
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
var uid uuid.UUID
uid, err = uuid.Parse(claims["hash_id"].(string))
if err != nil {
return uuid.Nil, err
}
return uid, nil
}
return uuid.Nil, nil
}
// TokenValid takes a http request, checks for a token and validates it.
func TokenValid(r *http.Request) error {
tokenString := extractToken(r)
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return environment.GetAPISecret(), nil
})
if err != nil {
return err
}
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
pretty(claims)
}
return nil
}
// extractToken extracts a token from a http request
func extractToken(r *http.Request) string {
keys := r.URL.Query()
token := keys.Get("token")
if token != "" {
return token
}
bearerToken := r.Header.Get("Authorization")
if len(strings.Split(bearerToken, " ")) == 2 {
return strings.Split(bearerToken, " ")[1]
}
return ""
}
// pretty just prints things in a nice output
func pretty(data interface{}) {
b, err := json.MarshalIndent(data, "", " ")
if err != nil {
log.Println(err)
return
}
log.Printf("user authenticated: \n%s\n", string(b))
}