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jwtService.go
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jwtService.go
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package user
import (
"fmt"
"time"
"github.com/boliev/wordy/internal/domain"
"github.com/dgrijalva/jwt-go"
)
// JwtService struct
type JwtService struct {
Secret string
TokenDays int
}
// CreateJwtService JwtService constructor
func CreateJwtService(secret string, tokenDays int) *JwtService {
return &JwtService{
Secret: secret,
TokenDays: tokenDays,
}
}
// Create returns token from user id
func (j JwtService) Create(id int) (*domain.UserAuth, error) {
expiresAt := time.Now().UTC().AddDate(0, 0, j.TokenDays)
claims := &jwt.MapClaims{
"id": id,
"expiresAt": expiresAt.Unix(),
}
token, err := jwt.NewWithClaims(jwt.SigningMethodHS256, claims).SignedString([]byte(j.Secret))
if err != nil {
return nil, err
}
return &domain.UserAuth{
Token: token,
ExpiresAt: expiresAt,
}, nil
}
// Parse returns user id from token
func (j JwtService) Parse(tokenString string) (int, error) {
claims, err := j.parseClaims(tokenString)
if err != nil {
return 0, err
}
tm := time.Unix(int64(claims["expiresAt"].(float64)), 0)
if tm.Before(time.Now()) {
return 0, fmt.Errorf("token expired")
}
id, ok := claims["id"]
if !ok {
return 0, fmt.Errorf("wrong token")
}
return int(id.(float64)), nil
}
func (j JwtService) parseClaims(tokenString string) (jwt.MapClaims, error) {
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
// hmacSampleSecret is a []byte containing your secret, e.g. []byte("my_secret_key")
return []byte(j.Secret), nil
})
if err != nil {
return nil, err
}
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
return nil, fmt.Errorf("cant get claims from token")
}
if token.Valid != true {
return nil, fmt.Errorf("token is invalid")
}
return claims, nil
}