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token.go
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token.go
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package auth
import (
"encoding/json"
"fmt"
"log"
"net/http"
"os"
"strings"
"time"
jwt "github.com/dgrijalva/jwt-go"
"github.com/google/uuid"
)
//CreateToken to generate the token
func CreateToken(userID uuid.UUID) (string, error) {
convertID := userID
claims := jwt.MapClaims{}
claims["authorized"] = true
claims["user_id"] = convertID.String()
claims["exp"] = time.Now().Add(time.Hour * 1999999).Unix() //Token expires after x hour
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString([]byte(os.Getenv("API_SECRET")))
}
//ExtractToken to extract the token
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 ""
}
//TokenValid to validate the token
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 []byte(os.Getenv("API_SECRET")), nil
})
if err != nil {
return err
}
if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
Pretty(claims)
}
return nil
}
//ExtractTokenID to extract the token ID
func ExtractTokenID(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 []byte(os.Getenv("API_SECRET")), nil
})
if err != nil {
return uuid.Nil, err
}
claims, ok := token.Claims.(jwt.MapClaims)
if ok && token.Valid {
uid, err := uuid.Parse(fmt.Sprintf("%s", claims["user_id"]))
if err != nil {
return uuid.Nil, err
}
return uid, nil
}
return uuid.Nil, nil
}
//Pretty display the claims licely in the terminal
func Pretty(data interface{}) {
b, err := json.MarshalIndent(data, "", " ")
if err != nil {
log.Println(err)
return
}
fmt.Println(string(b))
}