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package db
import (
"golang.org/x/crypto/bcrypt"
"crypto/rand"
"encoding/base64"
"database/sql"
)
func getNextUserId(db *sql.DB) (int, error) {
row := db.QueryRow("select coalesce(max(userid), 0) from users;")
if row.Err() != nil {
return -1, row.Err()
}
var id int
err := row.Scan(&id)
if err != nil {
return -1, err
}
return id+1, nil
}
func saltPassword(password string, salt []byte) []byte {
salted := []byte(password)
salted = append(salted, salt...)
return salted
}
func hashPassword(password string, salt []byte) ([]byte, error) {
salted := saltPassword(password, salt)
hash, err := bcrypt.GenerateFromPassword(salted, bcrypt.DefaultCost)
if err != nil {
return []byte{}, err
}
return hash, nil
}
func (p *Phlox) CreateUser(username, password string) (User, error) {
user := User{}
userId, err := getNextUserId(p.db)
if err != nil {
return user, err
}
salt := make([]byte, 10)
_, err = rand.Read(salt)
if err != nil {
return user, err
}
hash, err := hashPassword(password, salt)
if err != nil {
return user, err
}
hash64 := base64.StdEncoding.EncodeToString(hash)
salt64 := base64.StdEncoding.EncodeToString(salt)
_, err = p.db.Exec("insert into users (userid, username, passwordhash, salt) values (?, ?, ?, ?)", userId, username, hash64, salt64)
if err != nil {
return user, err
}
user.Id = userId
user.Name = username
user.PasswordHash = hash
user.Salt = salt
return user, nil
}
func (p *Phlox) DeleteUser(user User) error {
_, err := p.db.Exec("delete from users where userid=?;", user.Id)
return err
}
func (p *Phlox) SetPassword(user User, password string) error {
hash, err := hashPassword(password, user.Salt)
if err != nil {
return err
}
hash64 := base64.StdEncoding.EncodeToString(hash)
_, err = p.db.Exec("update users set passwordhash=? where userid=?;", hash64, user.Id)
return err
}
func extractUser(s Scanner) (User, error) {
var userid int
var username string
var hash64 string
var salt64 string
err := s.Scan(&userid, &username, &hash64, &salt64)
if err != nil {
return User{}, err
}
hash, err := base64.StdEncoding.DecodeString(hash64)
if err != nil {
return User{}, err
}
salt, err := base64.StdEncoding.DecodeString(salt64)
if err != nil {
return User{}, err
}
user := User{
Id: userid,
Name: username,
PasswordHash: hash,
Salt: salt,
}
return user, nil
}
func (p *Phlox) AuthenticateUser(username, password string) (bool, User, error) {
row := p.db.QueryRow("select * from users where username = ?;", username)
user, err := extractUser(row)
if err != nil {
return false, User{}, err
}
salted := saltPassword(password, user.Salt)
err = bcrypt.CompareHashAndPassword(user.PasswordHash, salted)
if err != nil {
// bad password
return false, User{}, nil
} else {
// success!
return true, user, nil
}
}
func (p *Phlox) GetByUsername(username string) (User, error) {
row := p.db.QueryRow("select * from users where username = ?;", username)
user, err := extractUser(row)
if err != nil {
return User{}, err
}
return user, nil
}
func (p *Phlox) GetById(id int) (User, error) {
row := p.db.QueryRow("select * from users where userid = ?;", id)
user, err := extractUser(row)
if err != nil {
return User{}, err
}
return user, nil
}
func (p *Phlox) AllUsers() ([]User, error) {
users := make([]User, 0)
rows, err := p.db.Query("select * from users;")
if err != nil {
return users, err
}
defer rows.Close()
for rows.Next() {
user, err := extractUser(rows)
if err != nil {
return users, err
}
users = append(users, user)
}
return users, nil
}
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