Class: GoogleSafeBrowsing::ResponseHelper

Inherits:
Object
  • Object
show all
Defined in:
lib/google_safe_browsing/response_helper.rb

Class Method Summary collapse

Class Method Details

.escape_and_join(values) ⇒ Object 



198
199
200
201
202
 
# File 'lib/google_safe_browsing/response_helper.rb', line 198

def self.escape_and_join(values)
  values.map do |v|
    ActiveRecord::Base::sanitize(v)
  end.join(', ')
end

.parse_data_line(line) ⇒ Object 



187
188
189
190
191
192
193
194
195
196
 
# File 'lib/google_safe_browsing/response_helper.rb', line 187

def self.parse_data_line(line)
  split_line = line.split(':')

  ret = {}
  ret[ :action ]        = split_line[0]
  ret[ :chunk_number ]  = split_line[1].to_i
  ret[ :hash_length ]   = split_line[2].to_i
  ret[ :chunk_length ]  = split_line[3].to_i
  ret
end

.parse_data_response(response) ⇒ Object 



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
 
# File 'lib/google_safe_browsing/response_helper.rb', line 20

def self.parse_data_response(response)
  ret = {}

  ret[:lists] = []
  ret[:data_urls] = {}

  current_list = ''
  response.split("\n").each do |line|
    vals = line.split(':')
    case vals[0]
    when 'n'
      ret[:delay_seconds] = vals[1].to_i
      @delay_seconds = ret[:delay_seconds].to_i
    when 'i'
      ret[:lists] << vals[1]
      current_list = vals[1]
      ret[:data_urls][current_list] = []
    when 'u'
      ret[:data_urls][current_list] << vals[1]
    when 'r'
      # reset (delete all data and try again)
    when 'ad'
      # vals[1] is a CHUNKLIST number or range representing add chunks to delete
      # we can also delete the associated Shavar Hashes
      # we no longer have to report that we received these chunks
      chunk_number_clause = ChunkHelper.chunklist_to_sql(vals[1])
      AddShavar.delete_all([ "list = ? and (?)", current_list, chunk_number_clause ])
    when 'sd'
      # vals[1] is a CHUNKLIST number or range representing sub chunks to delete
      # we no longer have to report that we received these chunks
      chunk_number_clause = ChunkHelper.chunklist_to_sql(vals[1])
      SubShavar.delete_all([ "list = ? and (?)", current_list, chunk_number_clause ])
    end
  end

  ret
end

.parse_full_hash_response(response) ⇒ Object 



3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 
# File 'lib/google_safe_browsing/response_helper.rb', line 3

def self.parse_full_hash_response(response)
  f = StringIO.new(response)

  full_hashes = []
  while(! f.eof? )
    hash = {}

    meta = f.gets.chomp.split(':')
    hash[:list] = meta[0]
    hash[:add_chunk_num] = meta[1]

    hash[:full_hash] = f.read(meta[2].to_i).unpack('H*')[0]
    full_hashes << hash
  end
  full_hashes
end

.pop_and_join(records) ⇒ Object 



204
205
206
 
# File 'lib/google_safe_browsing/response_helper.rb', line 204

def self.pop_and_join(records)
  records.pop(10000).join(', ')
end

.receive_data(url, list) ⇒ Object 



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
 
# File 'lib/google_safe_browsing/response_helper.rb', line 58

def self.receive_data(url, list)
  urls = url.split(',')
  url = urls[0]
  mac = urls[1]

  open(url) do |f|
    body = f.read

    unless mac.blank? || HttpHelper.valid_mac?(body, mac)
      raise InvalidMACVerification
    end

    f.rewind

    while(line = f.gets)
      line_actions = parse_data_line(line)

      chunk  = f.read(line_actions[:chunk_length])
      # f iterator is now set for next chunk

      add_attrs = { :chunk_number => line_actions[:chunk_number],
                :list => list, :prefix => nil, :host_key => nil
              }

      case line_actions[:action]
      when 'a'
        if line_actions[:chunk_length] == 0
          record_add_shavar_to_insert(add_attrs)
        else
          chunk_iterator = chunk.bytes.to_enum
          counter = 0
          begin
            while true
              add_attrs[:host_key] = BinaryHelper.read_bytes_as_hex(chunk_iterator, 4)
              count = chunk_iterator.next
              if count > 0
                count.times do |i|
                  add_attrs[:prefix] = BinaryHelper.read_bytes_as_hex(chunk_iterator, line_actions[:hash_length])
                  record_add_shavar_to_insert(add_attrs)
                end
              else
                add_attrs[:prefix] = add_attrs[:host_key]
                record_add_shavar_to_insert(add_attrs)
              end
              counter += 1
            end
          rescue StopIteration
            puts "Added #{counter} host_keys for add chunk number #{line_actions[:chunk_number]}"
          end
        end
      when 's'
        sub_attrs = add_attrs.merge({ :add_chunk_number => nil })
        if line_actions[:chunk_length] == 0
          record_sub_shavar_to_insert(sub_attrs)
        else
          chunk_iterator = chunk.bytes.to_enum
          counter = 0
          begin
            while true
              sub_attrs[:host_key] = BinaryHelper.read_bytes_as_hex(chunk_iterator, 4)
              count = chunk_iterator.next
              if count > 0
                count.times do |i|
                  sub_attrs[:add_chunk_number] = BinaryHelper.unpack_add_chunk_num(BinaryHelper.read_bytes_from(chunk_iterator, 4))
                  sub_attrs[:prefix] = BinaryHelper.read_bytes_as_hex(chunk_iterator, line_actions[:hash_length])
                  record_sub_shavar_to_insert(sub_attrs)
                end
              else
                sub_attrs[:add_chunk_number] = BinaryHelper.unpack_add_chunk_num(BinaryHelper.read_bytes_from(chunk_iterator, 4))
                sub_attrs[:prefix] = sub_attrs[:host_key]
                record_sub_shavar_to_insert(sub_attrs)
              end
              counter += 1
            end
          rescue StopIteration
            puts "Added #{counter} host_keys for sub chunk number #{line_actions[:chunk_number]}"
          end
        end
      else
        puts "neither a nor s ======================================================="
      end

    end
  end

  while @add_shavar_values && @add_shavar_values.any?
    AddShavar.connection.execute "      INSERT INTO gsb_add_shavars (prefix, host_key, chunk_number, list)\n      VALUES \#{pop_and_join @add_shavar_values}\n      SQL\n  end\n  while @sub_shavar_values && @sub_shavar_values.any?\n  SubShavar.connection.execute <<-SQL\n    INSERT INTO gsb_sub_shavars (prefix,\n                                 host_key,\n                                 add_chunk_number,\n                                 chunk_number,\n                                 list)\n    VALUES \#{pop_and_join @sub_shavar_values}\n    SQL\n  end\n\n  FullHash.connection.execute <<-SQL\n    DELETE FROM gsb_full_hashes\n    USING gsb_full_hashes\n    INNER JOIN  gsb_sub_shavars ON\n    gsb_sub_shavars.add_chunk_number = gsb_full_hashes.add_chunk_number\n    AND gsb_sub_shavars.list = gsb_full_hashes.list;\n    SQL\n\n  @add_shavar_values = []\n  @sub_shavar_values = []\nend\n"

.record_add_shavar_to_insert(h) ⇒ Object 



172
173
174
175
176
 
# File 'lib/google_safe_browsing/response_helper.rb', line 172

def self.record_add_shavar_to_insert(h)
  @add_shavar_values ||= []
  values = [ h[:prefix], h[:host_key], h[:chunk_number], h[:list] ]
  @add_shavar_values << "(#{escape_and_join values})"
end

.record_sub_shavar_to_insert(h) ⇒ Object 



177
178
179
180
181
182
183
184
185
 
# File 'lib/google_safe_browsing/response_helper.rb', line 177

def self.record_sub_shavar_to_insert(h)
  @sub_shavar_values ||= []
  values = [ h[:prefix],
             h[:host_key],
             h[:add_chunk_number],
             h[:chunk_number],
             h[:list] ]
  @sub_shavar_values << "(#{escape_and_join values})"
end