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package db
import (
"context"
"crypto/rand"
"crypto/sha256"
"database/sql"
"encoding/hex"
"errors"
"fmt"
"strings"
"time"
_ "github.com/go-sql-driver/mysql"
)
const (
tokenLength = 32
accessTokenTTL = 24 * time.Hour
)
// Account represents a verified account with its current tokens.
type Account struct {
ID int64 `json:"-"`
Username string `json:"username"`
RefreshToken string `json:"refresh_token"`
AccessToken string `json:"access_token"`
AccessTokenExpiry time.Time `json:"access_token_expires"`
CreatedAt time.Time `json:"created_at"`
}
// DB wraps sql.DB for wikiapiserver.
type DB struct {
conn *sql.DB
}
// Connect opens a MariaDB connection, pings it, and returns a ready DB.
func Connect(dsn string) (*DB, error) {
sqlDB, err := sql.Open("mysql", dsn)
if err != nil {
return nil, fmt.Errorf("open mysql: %w", err)
}
if err := sqlDB.Ping(); err != nil {
return nil, fmt.Errorf("ping mysql: %w", err)
}
sqlDB.SetMaxOpenConns(25)
sqlDB.SetMaxIdleConns(10)
sqlDB.SetConnMaxLifetime(5 * time.Minute)
return &DB{conn: sqlDB}, nil
}
// Close shuts down the connection pool.
func (d *DB) Close() error {
return d.conn.Close()
}
// Ping checks database liveness.
func (d *DB) Ping(ctx context.Context) error {
return d.conn.PingContext(ctx)
}
// --- crypto helpers ---
func randomHex(n int) (string, error) {
b := make([]byte, n)
if _, err := rand.Read(b); err != nil {
return "", fmt.Errorf("crypto rand: %w", err)
}
return hex.EncodeToString(b), nil
}
func sha256hex(s string) string {
h := sha256.Sum256([]byte(s))
return hex.EncodeToString(h[:])
}
// --- error helpers ---
func isDupKeyError(err error) bool {
return err != nil && strings.Contains(err.Error(), "1062")
}
// --- queries ---
// CreateAccount inserts a new row with plaintext password and fresh tokens.
func (d *DB) CreateAccount(ctx context.Context, username, plaintextPW string) (*Account, error) {
rt, err := randomHex(tokenLength)
if err != nil {
return nil, err
}
at, err := randomHex(tokenLength)
if err != nil {
return nil, err
}
res, err := d.conn.ExecContext(ctx,
`INSERT INTO account (username, password, refresh_token, access_token, access_token_created)
VALUES (?, ?, SHA2(?, 256), SHA2(?, 256), NOW())`,
username, plaintextPW, rt, at,
)
if err != nil {
if isDupKeyError(err) {
return nil, errors.New("username already exists")
}
return nil, fmt.Errorf("insert account: %w", err)
}
id, err := res.LastInsertId()
if err != nil {
return nil, err
}
now := time.Now()
return &Account{
ID: id,
Username: username,
RefreshToken: rt,
AccessToken: at,
AccessTokenExpiry: now.Add(accessTokenTTL),
CreatedAt: now,
}, nil
}
// Authenticate verifies plaintext credentials and returns fresh tokens.
func (d *DB) Authenticate(ctx context.Context, username, plaintextPW string) (*Account, error) {
var storedPW string
err := d.conn.QueryRowContext(ctx,
`SELECT password FROM account WHERE username = ?`, username,
).Scan(&storedPW)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, errors.New("invalid credentials")
}
return nil, fmt.Errorf("query user: %w", err)
}
if storedPW != plaintextPW {
return nil, errors.New("invalid credentials")
}
// Look up account id, then rotate tokens
var id int64
if err := d.conn.QueryRowContext(ctx,
`SELECT id FROM account WHERE username = ?`, username,
).Scan(&id); err != nil {
return nil, fmt.Errorf("lookup id: %w", err)
}
return d.RotateTokens(ctx, id)
}
// RotateTokens generates new refresh + access tokens for an account.
func (d *DB) RotateTokens(ctx context.Context, id int64) (*Account, error) {
rt, err := randomHex(tokenLength)
if err != nil {
return nil, err
}
at, err := randomHex(tokenLength)
if err != nil {
return nil, err
}
res, err := d.conn.ExecContext(ctx,
`UPDATE account SET refresh_token = SHA2(?, 256), access_token = SHA2(?, 256), access_token_created = NOW()
WHERE id = ?`, rt, at, id)
if err != nil {
return nil, fmt.Errorf("rotate tokens: %w", err)
}
if affected, _ := res.RowsAffected(); affected == 0 {
return nil, errors.New("account not found")
}
var username string
if err := d.conn.QueryRowContext(ctx,
`SELECT username FROM account WHERE id = ?`, id,
).Scan(&username); err != nil {
return nil, fmt.Errorf("lookup username: %w", err)
}
now := time.Now()
return &Account{
ID: id,
Username: username,
RefreshToken: rt,
AccessToken: at,
AccessTokenExpiry: now.Add(accessTokenTTL),
CreatedAt: now,
}, nil
}
// RefreshByToken looks up an account by its refresh token and rotates both tokens.
func (d *DB) RefreshByToken(ctx context.Context, refreshToken string) (*Account, error) {
var id int64
err := d.conn.QueryRowContext(ctx,
`SELECT id FROM account WHERE refresh_token = SHA2(?, 256)`, refreshToken,
).Scan(&id)
if err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, errors.New("invalid refresh token")
}
return nil, fmt.Errorf("lookup refresh token: %w", err)
}
return d.RotateTokens(ctx, id)
}
// HealthCheck runs a trivial query to verify DB liveness.
func (d *DB) HealthCheck(ctx context.Context) error {
_, err := d.conn.ExecContext(ctx, "SELECT 1")
return err
}
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