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token.go
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token.go
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package user
import (
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"strings"
"time"
jwt "github.com/golang-jwt/jwt/v4"
)
var TokenExpiration int
var ApiSecret string
func CreateToken(email string) (string, error) {
claims := jwt.MapClaims{}
claims["authorized"] = true
claims["email"] = email
claims["exp"] = time.Now().Add(time.Minute * time.Duration(TokenExpiration)).Unix()
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
return token.SignedString([]byte(ApiSecret))
}
// Check if token is valid, if valid returns the associated email
func TokenValid(r *http.Request) (string, 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(ApiSecret), nil
})
if err != nil {
return "", err
}
// Token should be valid at this point, otherwise Parse would
// have returned an error. To be safe though we still validate...
if !token.Valid {
return "", errors.New("invalid token")
}
claims := token.Claims.(jwt.MapClaims)
return claims["email"].(string), nil
}
func TokenClaims(token *jwt.Token) (jwt.MapClaims, error) {
if token == nil || !token.Valid {
return nil, errors.New("invalid token")
}
claims, ok := token.Claims.(jwt.MapClaims)
if ok {
Pretty(claims)
return claims, nil
}
return nil, errors.New("invalid 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 ""
}
func ExtractTokenID(token string) (string, error) {
jwtToken, err := jwt.Parse(token, 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(ApiSecret), nil
})
if err != nil {
return "", err
}
claims, ok := jwtToken.Claims.(jwt.MapClaims)
if ok && jwtToken.Valid {
email := claims["email"].(string)
return email, nil
}
return "", nil
}
//Pretty display the claims nicely in the terminal
func Pretty(data interface{}) {
b, err := json.MarshalIndent(data, "", " ")
if err != nil {
log.Println(err)
return
}
fmt.Println(string(b))
}