Module: Erbac::ActiveRecordSupport::ClassMethods

Defined in:
lib/erbac/active_record_support.rb

Instance Method Summary collapse

Instance Method Details

#control_access ⇒ Object 



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
 
# File 'lib/erbac/active_record_support.rb', line 8

def control_access
  has_many Erbac.auth_assignment.pluralize.to_sym,
    dependent: :delete_all,
    class_name: Erbac.auth_assignment_class,
    foreign_key: "user_id"

	has_many Erbac.auth_item.pluralize.to_sym, 
    through: Erbac.auth_assignment.pluralize.to_sym,
    source: Erbac.auth_item.pluralize.to_sym

  define_method :check_access? do |*args|
    unless (args.first.is_a? Erbac.auth_item_class.constantize)
      raise TypeError, "Should pass in #{Erbac.auth_item_class} instance as the first parameter. Got #{args.first.to_s}", caller
    end

    check_access_recursive? args.first, args.extract_options!
  end

  define_method :execute_biz_rule? do |*args|
    item = args.first
    params = args.extract_options!
    if (item.is_a? Erbac.auth_item_class.constantize or item.is_a? Erbac.auth_assignment_class.constantize)
      bizrule_sandbox(item.bizrule, params, item.data)
    else
      raise TypeError, "Argument type not supported, should pass in #{Erbac.auth_item_class} or #{Erbac.auth_assignment_class} instance as the first parameter. Got #{item.class.to_s}", caller
    end
  end

  define_method :check_access_recursive? do |item, params={}|
    if bizrule_sandbox(item.bizrule, params, item.data)
      return true if Erbac.default_roles.include? item.name
      assignment = Erbac.auth_assignment_class.constantize.where(user_id: self, item_id: item).first
      if assignment
        return true if bizrule_sandbox(assignment.bizrule, params, assignment.data)
      end
      item.parents.each do |p|
        return true if check_access_recursive?(p, params)
      end
    end
    false
  end

  define_method :bizrule_sandbox do |bizrule, params={}, data=nil|
    if (bizrule.nil? or bizrule.empty?)
      true
    else
      proc do
      	# $SAFE = 3 how to change this ?
        Erbac.strict_check_mode ? (self.instance_eval bizrule) == true : (self.instance_eval bizrule) != false
      end.call
    end
  end

  send :protected, :check_access_recursive?, :bizrule_sandbox
  
  # add an anonymous singleton instance
  @anonymous = self.new
  class << self
  	define_method :anonymous do
  		@anonymous
  	end
  end

  define_method :anonymous_should_not_be_saved do
  	raise NoMethodError, "Anonymous object should not be saved!", caller if self.equal? self.class.anonymous
  end

  before_save :anonymous_should_not_be_saved

  define_method :anonymous? do
  	self.equal? @anonymous
  end

end

#control_auth_assignment ⇒ Object 



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
 
# File 'lib/erbac/active_record_support.rb', line 200

def control_auth_assignment
  attr_accessible :item_id, :user_id, :bizrule, :data

  belongs_to Erbac.user_class.underscore.pluralize.to_sym,
    class_name: Erbac.user_class,
    foreign_key: "user_id"

  belongs_to Erbac.auth_item.pluralize.to_sym,
    class_name: Erbac.auth_item_class,
    foreign_key: "item_id"

  protected

  # should marshal the data when it comes to database
  # make it transparent with the user
  define_method :marshal_around_save do |*args, &block|
    data = self.data
    self.data = Marshal.dump(data).force_encoding("UTF-8")
    block.call # it is a trick, search it!
    self.data = data
  end
  around_save :marshal_around_save

  define_method :marshal_after_find do
    begin # rescue marshal error and replace with nil
    	self.data = Marshal.restore self.data
    rescue ArgumentError
    	self.data = nil
    end
  end
  after_find :marshal_after_find

  send :private, :marshal_around_save, :marshal_after_find
end

#control_auth_item ⇒ Object 



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
 
# File 'lib/erbac/active_record_support.rb', line 83

def control_auth_item
  attr_accessible :name, :auth_type, :description, :bizrule, :data
  validates :name, uniqueness: true

  has_many Erbac.auth_assignment.pluralize.to_sym,
    dependent: :delete_all,
    class_name: Erbac.auth_assignment_class,
    foreign_key: "item_id"

  has_many Erbac.user_class.underscore.pluralize.to_sym, 
    through: Erbac.auth_assignment.pluralize.to_sym,
    source: Erbac.user_class.underscore.pluralize.to_sym

  has_and_belongs_to_many :parents,
    join_table: Erbac.auth_item_child_table,
    class_name: Erbac.auth_item_class,
    foreign_key: "child_id", association_foreign_key: "parent_id"

  has_and_belongs_to_many :children,
    join_table: Erbac.auth_item_child_table,
    class_name: Erbac.auth_item_class,
    foreign_key: "parent_id", association_foreign_key: "child_id"

  const_set("TYPE_OPERATION", 0)
  const_set("TYPE_TASK", 1)
  const_set("TYPE_ROLE", 2)

  
  define_method :add_child do |item|
    if self.name == item.name
      raise AuthItemRelationError, "Cannot add #{self.name} as a child of itself.", caller
    end

    check_item_child_type(item)

    if detect_loop?(item)
      raise AuthItemRelationError, "Cannot add #{child.name} as a child of #{self.name}. A loop has been detected.", caller 
    end

    self.children << item
  end

  define_method :remove_child do |item|
    self.children.delete item
  end

  define_method :has_child? do |item|
    self.children.include? item
  end

  define_method :assign do |user, bizrule=nil, data=nil|
    assignment = Erbac.auth_assignment_class.constantize.where({item_id: self, user_id: user}).first_or_create
    assignment.bizrule = bizrule
    assignment.data = data
    assignment.save
    assignment
  end

  define_method :revoke do |user|
    Erbac.auth_assignment_class.constantize.delete_all({item_id: self, user_id: user})
  end

  define_method :is_assigned? do |user|
    Erbac.auth_assignment_class.constantize.where({item_id: self, user_id: user}).any?
  end

  define_method :get_auth_assignment? do |user|
    Erbac.auth_assignment_class.constantize.where({item_id: self, user_id: user}).first
  end

  define_method :detect_loop? do |child|
    return true if (self.name == child.name)
    child.children.each do |g|
      return true if self.detect_loop?(g)
    end
    false
  end


  define_method :check_item_child_type do |child|
    unless (self.is_a? Erbac.auth_item_class.constantize)
      raise TypeError, "Should pass in #{Erbac.auth_item_class} instance as the first parameter. Got #{self.to_s}", caller
    end

    unless (child.is_a? Erbac.auth_item_class.constantize)
      raise TypeError, "Should pass in #{Erbac.auth_item_class} instance as the second parameter. Got #{child.to_s}", caller
    end

    if self.auth_type < child.auth_type
      raise Erbac::AuthItemRelationError, "Cannot add an itme of type #{AUTH_TYPES[child.auth_type]} to an item of type #{AUTH_TYPES[self.auth_type]}.", caller
    end
  end

  # should marshal the data when it comes to database
  # make it transparent with the user
  define_method :marshal_around_save do |*args, &block|
    data = self.data
    self.data = Marshal.dump(data).force_encoding("UTF-8")
    block.call # it is a trick, search it!
    self.data = data
  end
  around_save :marshal_around_save

  define_method :marshal_after_find do
  	begin # rescue marshal error and replace with nil
    	self.data = Marshal.restore self.data
    rescue ArgumentError
    	self.data = nil
    end
  end
  after_find :marshal_after_find

  send :protected, :detect_loop?, :check_item_child_type
  send :private, :marshal_around_save, :marshal_after_find

end