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users.go
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users.go
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package database
import (
"errors"
"golang.org/x/crypto/bcrypt"
)
type User struct {
ID int
Username string
Password string
}
func CreateUser(username, password string) error {
tx, err := db.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare("INSERT INTO users (username, password) VALUES (?, ?)")
if err != nil {
return err
}
hashedPassword, err := hashPassword(password)
if err != nil {
return err
}
_, err = stmt.Exec(username, hashedPassword)
if err != nil {
return err
}
err = tx.Commit()
if err != nil {
return err
}
return nil
}
func GetUserByID(id int) (User, error) {
var u User
row := db.QueryRow("SELECT * FROM users WHERE id = ?", id)
err := row.Scan(&u.ID, &u.Username, &u.Password)
if err != nil {
return User{}, err
}
return u, nil
}
func GetUserByUsername(username string) (User, error) {
var u User
row := db.QueryRow("SELECT * FROM users WHERE username = ?", username)
err := row.Scan(&u.ID, &u.Username, &u.Password)
if err != nil {
return User{}, err
}
return u, nil
}
func CheckUserLogin(username, password string) (bool, error) {
var u User
row := db.QueryRow("SELECT * FROM users WHERE username = ?", username)
err := row.Scan(&u.ID, &u.Username, &u.Password)
if err != nil {
return false, err
}
err = bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
if err != nil {
if errors.Is(err, bcrypt.ErrMismatchedHashAndPassword) {
// we don't need to return this error to the caller
return false, nil
}
return false, err
}
return true, nil
}
func UpdateUser(id int, user User) error {
tx, err := db.Begin()
if err != nil {
return err
}
stmt, err := tx.Prepare("UPDATE users SET username = ?, password = ? WHERE id = ?")
if err != nil {
return err
}
_, err = stmt.Exec(user.Username, user.Password, id)
if err != nil {
return err
}
err = tx.Commit()
if err != nil {
return err
}
return nil
}
func hashPassword(password string) (string, error) {
hashed, err := bcrypt.GenerateFromPassword([]byte(password), 10)
if err != nil {
return "", err
}
return string(hashed), nil
}