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annotate auth/session.go @ 193:1585c334e8a7

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More on persisting sessions.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Fri, 20 Jul 2018 18:32:11 +0200
parents 83d798ea9f58
children e85413e5befa
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1 package auth
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2
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3 import (
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4 "crypto/rand"
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5 "encoding/base64"
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6 "encoding/binary"
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7 "io"
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8 "time"
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9 )
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10
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11 type Session struct {
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12 ExpiresAt int64 `json:"expires"`
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13 User string `json:"user"`
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14 Password string `json:"password"`
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15 Roles []string `json:"roles"`
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16 }
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17
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18 const (
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19 sessionKeyLength = 20
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20 maxTokenValid = time.Hour * 3
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21 )
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22
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23 func NewSession(user, password string, roles []string) *Session {
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25 // Create the Claims
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26 return &Session{
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27 ExpiresAt: time.Now().Add(maxTokenValid).Unix(),
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28 User: user,
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29 Password: password,
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30 Roles: roles,
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31 }
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32 }
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33
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34 func (s *Session) serialize(w io.Writer) {
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35 binary.Write(w, binary.BigEndian, s.ExpiresAt)
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36 binary.Write(w, binary.BigEndian, s.User)
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37 binary.Write(w, binary.BigEndian, s.Password)
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38 binary.Write(w, binary.BigEndian, uint32(len(s.Roles)))
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39 for _, role := range s.Roles {
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40 binary.Write(w, binary.BigEndian, role)
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41 }
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42 }
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43
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44 func (s *Session) unserialize(r io.Reader) error {
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45 var x Session
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46 binary.Read(r, binary.BigEndian, &x.ExpiresAt)
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47 binary.Read(r, binary.BigEndian, &x.User)
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48 binary.Read(r, binary.BigEndian, &x.Password)
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49 var n uint32
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50 binary.Read(r, binary.BigEndian, &n)
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51 x.Roles = make([]string, n)
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52 for i := uint32(0); n > 0 && i < n; i++ {
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53 if err := binary.Read(r, binary.BigEndian, &x.Roles[i]); err != nil {
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54 return err
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55 }
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56 }
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57 *s = x
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58 return nil
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59 }
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61 func GenerateSessionKey() string {
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62 return base64.URLEncoding.EncodeToString(GenerateRandomKey(sessionKeyLength))
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63 }
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64
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65 func GenerateRandomKey(length int) []byte {
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66 k := make([]byte, length)
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67 if _, err := io.ReadFull(rand.Reader, k); err != nil {
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68 return nil
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69 }
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70 return k
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71 }
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72
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73 func GenerateSession(user, password string) (string, *Session, error) {
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74 roles, err := AllOtherRoles(user, password)
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75 if err != nil {
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76 return "", nil, err
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77 }
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78 token := GenerateSessionKey()
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79 session := NewSession(user, password, roles)
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80 ConnPool.Add(token, session)
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81 return token, session, nil
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82 }