1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
require 'rack/utils'
require 'rack/request'
require 'action_dispatch/middleware/cookies'
require 'active_support/core_ext/object/blank'
module ActionDispatch
module Session
class SessionRestoreError < StandardError #:nodoc:
end
class AbstractStore
ENV_SESSION_KEY = 'rack.session'.freeze
ENV_SESSION_OPTIONS_KEY = 'rack.session.options'.freeze
# thin wrapper around Hash that allows us to lazily
# load session id into session_options
class OptionsHash < Hash
def initialize(by, env, default_options)
@by = by
@env = env
@session_id_loaded = false
merge!(default_options)
end
def [](key)
if key == :id
load_session_id! unless super(:id) || has_session_id?
end
super(key)
end
private
def has_session_id?
@session_id_loaded
end
def load_session_id!
self[:id] = @by.send(:extract_session_id, @env)
@session_id_loaded = true
end
end
class SessionHash < Hash
def initialize(by, env)
super()
@by = by
@env = env
@loaded = false
end
def [](key)
load_for_read!
super(key.to_s)
end
def has_key?(key)
load_for_read!
super(key.to_s)
end
def []=(key, value)
load_for_write!
super(key.to_s, value)
end
def to_hash
load_for_read!
h = {}.replace(self)
h.delete_if { |k,v| v.nil? }
h
end
def update(hash)
load_for_write!
super(hash.stringify_keys)
end
def delete(key)
load_for_write!
super(key.to_s)
end
def inspect
load_for_read!
super
end
def exists?
return @exists if instance_variable_defined?(:@exists)
@exists = @by.send(:exists?, @env)
end
def loaded?
@loaded
end
def destroy
clear
@by.send(:destroy, @env) if @by
@env[ENV_SESSION_OPTIONS_KEY][:id] = nil if @env && @env[ENV_SESSION_OPTIONS_KEY]
@loaded = false
end
private
def load_for_read!
load! if !loaded? && exists?
end
def load_for_write!
load! unless loaded?
end
def load!
id, session = @by.send(:load_session, @env)
@env[ENV_SESSION_OPTIONS_KEY][:id] = id
replace(session.stringify_keys)
@loaded = true
end
end
DEFAULT_OPTIONS = {
:key => '_session_id',
:path => '/',
:domain => nil,
:expire_after => nil,
:secure => false,
:httponly => true,
:cookie_only => true
}
def initialize(app, options = {})
@app = app
@default_options = DEFAULT_OPTIONS.merge(options)
@key = @default_options.delete(:key).freeze
@cookie_only = @default_options.delete(:cookie_only)
ensure_session_key!
end
def call(env)
prepare!(env)
response = @app.call(env)
session_data = env[ENV_SESSION_KEY]
options = env[ENV_SESSION_OPTIONS_KEY]
if !session_data.is_a?(AbstractStore::SessionHash) || session_data.loaded? || options[:expire_after]
session_data.send(:load!) if session_data.is_a?(AbstractStore::SessionHash) && !session_data.loaded?
sid = options[:id] || generate_sid
session_data = session_data.to_hash
value = set_session(env, sid, session_data)
return response unless value
cookie = { :value => value }
unless options[:expire_after].nil?
cookie[:expires] = Time.now + options.delete(:expire_after)
end
request = ActionDispatch::Request.new(env)
set_cookie(request, cookie.merge!(options))
end
response
end
private
def prepare!(env)
env[ENV_SESSION_KEY] = SessionHash.new(self, env)
env[ENV_SESSION_OPTIONS_KEY] = OptionsHash.new(self, env, @default_options)
end
def generate_sid
ActiveSupport::SecureRandom.hex(16)
end
def set_cookie(request, options)
if request.cookie_jar[@key] != options[:value] || !options[:expires].nil?
request.cookie_jar[@key] = options
end
end
def load_session(env)
stale_session_check! do
sid = current_session_id(env)
sid, session = get_session(env, sid)
[sid, session]
end
end
def extract_session_id(env)
stale_session_check! do
request = ActionDispatch::Request.new(env)
sid = request.cookies[@key]
sid ||= request.params[@key] unless @cookie_only
sid
end
end
def current_session_id(env)
env[ENV_SESSION_OPTIONS_KEY][:id]
end
def ensure_session_key!
if @key.blank?
raise ArgumentError, 'A key is required to write a ' +
'cookie containing the session data. Use ' +
'config.session_store SESSION_STORE, { :key => ' +
'"_myapp_session" } in config/application.rb'
end
end
def stale_session_check!
yield
rescue ArgumentError => argument_error
if argument_error.message =~ %r{undefined class/module ([\w:]*\w)}
begin
# Note that the regexp does not allow $1 to end with a ':'
$1.constantize
rescue LoadError, NameError => const_error
raise ActionDispatch::Session::SessionRestoreError, "Session contains objects whose class definition isn't available.\nRemember to require the classes for all objects kept in the session.\n(Original exception: #{const_error.message} [#{const_error.class}])\n"
end
retry
else
raise
end
end
def exists?(env)
current_session_id(env).present?
end
def get_session(env, sid)
raise '#get_session needs to be implemented.'
end
def set_session(env, sid, session_data)
raise '#set_session needs to be implemented and should return ' <<
'the value to be stored in the cookie (usually the sid)'
end
def destroy(env)
raise '#destroy needs to be implemented.'
end
end
end
end
|
