Mercurial > gemma
annotate pkg/auth/store.go @ 1401:178f5beeab03
client: (minor) fix header formatting
author | Fadi Abbud <fadi.abbud@intevation.de> |
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date | Wed, 28 Nov 2018 16:15:14 +0100 |
parents | 9e0beb373690 |
children | 0db742c7813d |
rev | line source |
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1 // This is Free Software under GNU Affero General Public License v >= 3.0 |
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2 // without warranty, see README.md and license for details. |
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3 // |
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4 // SPDX-License-Identifier: AGPL-3.0-or-later |
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5 // License-Filename: LICENSES/AGPL-3.0.txt |
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6 // |
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7 // Copyright (C) 2018 by via donau |
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH |
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9 // Software engineering by Intevation GmbH |
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10 // |
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11 // Author(s): |
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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13 |
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14 package auth |
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15 |
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16 import ( |
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17 "bytes" |
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18 "errors" |
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19 "log" |
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20 "time" |
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21 |
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22 bolt "github.com/etcd-io/bbolt" |
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23 ) |
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24 |
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25 // ErrNoSuchToken is returned if a given token does not |
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26 // exists th the session store. |
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27 var ErrNoSuchToken = errors.New("No such token") |
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28 |
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29 // Sessions is the global connection pool. |
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30 var Sessions *SessionStore |
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31 |
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32 // SessionStore encapsulates a set of currently active sessions. |
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33 type SessionStore struct { |
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34 storage *bolt.DB |
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35 sessions map[string]*Session |
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36 cmds chan func() |
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37 } |
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38 |
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39 var sessionsBucket = []byte("sessions") |
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40 |
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41 // NewSessionStore creates a new session store. |
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42 // If the filename is empty the session are only hold in memory. |
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43 // If the filename is not empty the sessions are mirrored to |
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44 // a file with this name. Use the later option if you want |
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45 // a persistent session store. |
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46 func NewSessionStore(filename string) (*SessionStore, error) { |
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47 |
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48 ss := &SessionStore{ |
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49 sessions: make(map[string]*Session), |
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50 cmds: make(chan func()), |
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51 } |
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52 if err := ss.openStorage(filename); err != nil { |
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53 return nil, err |
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54 } |
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55 go ss.run() |
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56 return ss, nil |
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57 } |
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58 |
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59 // openStorage opens a storage file. |
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60 func (ss *SessionStore) openStorage(filename string) error { |
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61 |
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62 // No file, nothing to restore/persist. |
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63 if filename == "" { |
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64 return nil |
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65 } |
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66 |
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67 db, err := bolt.Open(filename, 0600, nil) |
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68 if err != nil { |
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69 return err |
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70 } |
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71 |
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72 err = db.Update(func(tx *bolt.Tx) error { |
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73 b, err := tx.CreateBucketIfNotExists(sessionsBucket) |
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74 if err != nil { |
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75 return err |
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76 } |
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77 |
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78 // pre-load sessions |
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79 c := b.Cursor() |
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80 |
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81 for k, v := c.First(); k != nil; k, v = c.Next() { |
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82 var session Session |
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83 if err := session.deserialize(bytes.NewReader(v)); err != nil { |
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84 return err |
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85 } |
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86 ss.sessions[string(k)] = &session |
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87 } |
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88 |
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89 return nil |
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90 }) |
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91 |
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92 if err != nil { |
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93 db.Close() |
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94 return err |
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95 } |
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96 |
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97 ss.storage = db |
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98 return nil |
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99 } |
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100 |
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101 func (ss *SessionStore) run() { |
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102 for { |
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103 select { |
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104 case cmd := <-ss.cmds: |
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105 cmd() |
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106 case <-time.After(time.Minute * 5): |
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107 ss.cleanToken() |
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108 } |
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109 } |
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110 } |
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111 |
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112 func (ss *SessionStore) cleanToken() { |
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113 now := time.Now() |
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114 for token, session := range ss.sessions { |
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115 expires := time.Unix(session.ExpiresAt, 0) |
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116 if expires.Before(now) { |
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117 delete(ss.sessions, token) |
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118 ss.remove(token) |
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119 } |
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120 } |
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121 } |
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122 |
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123 func (ss *SessionStore) remove(token string) { |
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124 if ss.storage == nil { |
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125 return |
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126 } |
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127 err := ss.storage.Update(func(tx *bolt.Tx) error { |
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128 b := tx.Bucket(sessionsBucket) |
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129 return b.Delete([]byte(token)) |
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130 }) |
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131 if err != nil { |
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132 log.Printf("error: %v\n", err) |
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133 } |
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134 } |
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135 |
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136 // Delete removes a session identified by its token from the |
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137 // session store. Returns true if there was such s session. |
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138 func (ss *SessionStore) Delete(token string) bool { |
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139 res := make(chan bool) |
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140 ss.cmds <- func() { |
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141 if _, found := ss.sessions[token]; !found { |
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142 res <- false |
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143 return |
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144 } |
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145 delete(ss.sessions, token) |
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146 ss.remove(token) |
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147 res <- true |
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148 } |
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149 return <-res |
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150 } |
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151 |
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152 func (ss *SessionStore) store(token string, session *Session) { |
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153 if ss.storage == nil { |
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154 return |
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155 } |
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156 err := ss.storage.Update(func(tx *bolt.Tx) error { |
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157 b := tx.Bucket(sessionsBucket) |
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158 var buf bytes.Buffer |
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159 if err := session.serialize(&buf); err != nil { |
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160 return err |
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161 } |
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162 return b.Put([]byte(token), buf.Bytes()) |
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163 }) |
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164 if err != nil { |
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165 log.Printf("error: %v\n", err) |
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166 } |
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|
167 } |
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168 |
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169 // Add puts a session into the session store identified by |
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170 // a given token. An old session with the same key will |
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171 // be replaced. |
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172 func (ss *SessionStore) Add(token string, session *Session) { |
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173 res := make(chan struct{}) |
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174 |
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175 ss.cmds <- func() { |
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176 defer close(res) |
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|
177 s := ss.sessions[token] |
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178 if s == nil { |
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179 s = session |
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180 ss.sessions[token] = session |
199
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181 } |
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|
182 s.touch() |
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|
183 ss.store(token, s) |
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|
184 } |
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|
185 |
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|
186 <-res |
190
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|
187 } |
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188 |
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189 // Renew refreshes a session. It takes an old token to |
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190 // identify a session and returns a new token with the |
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191 // freshed up one. |
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192 func (ss *SessionStore) Renew(token string) (string, error) { |
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|
193 |
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|
194 type result struct { |
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|
195 newToken string |
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|
196 err error |
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|
197 } |
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|
198 |
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|
199 resCh := make(chan result) |
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200 |
513
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201 ss.cmds <- func() { |
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202 session := ss.sessions[token] |
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203 if session == nil { |
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|
204 resCh <- result{err: ErrNoSuchToken} |
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|
205 } else { |
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206 delete(ss.sessions, token) |
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207 ss.remove(token) |
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|
208 newToken := generateSessionKey() |
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209 // TODO: Ensure that this is not racy! |
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210 session.ExpiresAt = time.Now().Add(maxTokenValid).Unix() |
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|
211 ss.sessions[newToken] = session |
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|
212 ss.store(newToken, session) |
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213 resCh <- result{newToken: newToken} |
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214 } |
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|
215 } |
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216 |
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217 r := <-resCh |
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218 return r.newToken, r.err |
190
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219 } |
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220 |
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221 // Session returns the session associated with given token. |
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222 // Returns nil if no matching session was found. |
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223 func (ss *SessionStore) Session(token string) *Session { |
202
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diff
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|
224 res := make(chan *Session) |
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225 ss.cmds <- func() { |
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226 session := ss.sessions[token] |
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227 if session == nil { |
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228 res <- nil |
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229 } else { |
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230 session.touch() |
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231 ss.store(token, session) |
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232 res <- session |
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233 } |
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234 } |
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235 return <-res |
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236 } |
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237 |
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238 // Logout removes all sessions of a given user from the session store. |
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239 func (ss *SessionStore) Logout(user string) { |
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240 ss.cmds <- func() { |
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241 for token, session := range ss.sessions { |
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242 if session.User == user { |
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243 delete(ss.sessions, token) |
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244 ss.remove(token) |
240
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245 } |
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246 } |
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247 } |
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248 } |
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249 |
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250 // Shutdown closes the session store. |
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251 // If using the persistent mode the backing session database is closed. |
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252 func (ss *SessionStore) Shutdown() error { |
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253 if db := ss.storage; db != nil { |
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254 log.Println("info: shutdown persistent session store.") |
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255 ss.storage = nil |
193
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256 return db.Close() |
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257 } |
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258 log.Println("info: shutdown in-memory session store.") |
190
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259 return nil |
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260 } |