79 lines
1.6 KiB
Go
79 lines
1.6 KiB
Go
// SPDX-License-Identifier: Apache-2.0
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// Copyright © 2022 Roberto Hidalgo <nidito@un.rob.mx>
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package auth
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import (
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"math/rand"
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"strings"
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"time"
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"github.com/upper/db/v4"
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)
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var letterSrc = rand.NewSource(time.Now().UnixNano())
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const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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const (
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// 6 bits to represent a letter index
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letterIdxBits = 6
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// All 1-bits, as many as letterIdxBits
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letterIdxMask = 1<<letterIdxBits - 1
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// # of letter indices fitting in 63 bits
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letterIdxMax = 63 / letterIdxBits
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)
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func NewToken() string {
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sb := strings.Builder{}
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n := 32
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sb.Grow(n)
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for i, cache, remain := n-1, letterSrc.Int63(), letterIdxMax; i >= 0; {
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if remain == 0 {
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cache, remain = letterSrc.Int63(), letterIdxMax
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}
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if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
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sb.WriteByte(letterBytes[idx])
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i--
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}
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cache >>= letterIdxBits
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remain--
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}
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return sb.String()
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}
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type Session struct {
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Token string `db:"token"`
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UserID int `db:"user"`
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Expires time.Time `db:"expires"`
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}
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type SessionUser struct {
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Token string `db:"token"`
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UserID int `db:"user"`
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Expires time.Time `db:"expires"`
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User `db:",inline"`
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}
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func (s *Session) Store(sess db.Session) db.Store {
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return sess.Collection("session")
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}
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func (s *Session) Expired() bool {
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return s.Expires.Before(time.Now())
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}
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func NewSession(user *User, table db.Collection) (*Session, error) {
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sess := &Session{
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Token: NewToken(),
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UserID: user.ID,
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Expires: user.TTL.FromNow(),
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}
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// delete previous sessions
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table.Find(db.Cond{"user": user.ID}).Delete()
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// insert new one
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_, err := table.Insert(sess)
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return sess, err
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}
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