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service.go
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service.go
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package users
import (
"log"
"os"
"time"
"github.com/devisions/go-mux-jwt-gorm-starter/api/rest/config"
"github.com/devisions/go-mux-jwt-gorm-starter/api/rest/tokens"
"github.com/devisions/go-mux-jwt-gorm-starter/app"
"github.com/dgrijalva/jwt-go"
"golang.org/x/crypto/bcrypt"
)
// UserService
type UserService interface {
Authenticate(email, password string) (*tokens.JWTToken, error)
Register(name, email, password string) (*User, error)
GetByID(id uint) (*User, error)
}
func NewUserService(store UserStore) UserService {
return &userService{
userStore: store,
}
}
// Implementation of the UserService.
type userService struct {
userStore UserStore
}
func (us *userService) Authenticate(email, password string) (*tokens.JWTToken, error) {
user, err := us.userStore.GetByEmail(email)
if err != nil {
log.Printf("Error at authenticate: %s\n", err)
return nil, err
}
if user.checkPassword(password) {
return generateJWT(*user)
}
return nil, app.ErrInvalidCreds.AsError()
}
func (us *userService) Register(name, email, password string) (*User, error) {
user := User{
Name: name,
Email: email,
Hash: us.hashPassword(password),
}
if err := us.userStore.Create(&user); err != nil {
return nil, err
}
return &user, nil
}
func (us *userService) GetByID(id uint) (*User, error) {
return us.userStore.GetByID(id)
}
func (us *userService) hashPassword(password string) string {
bytes, _ := bcrypt.GenerateFromPassword([]byte(password), 4)
return string(bytes)
}
// generateJWT generates a signed JWT with user details as claims.
func generateJWT(user User) (*tokens.JWTToken, error) {
signingKey := []byte(os.Getenv(config.JwtSignKey))
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
"exp": time.Now().Add(1 * time.Hour).Unix(),
"user_id": int(user.ID),
"name": user.Name,
"email": user.Email,
})
tokenString, err := token.SignedString(signingKey)
if err != nil {
log.Printf("Error while generating jwt: %s\n", err)
}
return &tokens.JWTToken{
Token: tokenString,
}, err
}