git ssb

1
// Copyright 2012 Iris Couch, all rights reserved.
2
//
3
// Looking up and converting between various constants
4
5
var util = require('util')
6
7
module.exports = { 'type'           : swap_type
8
                 , 'class'          : swap_class
9
                 , 'type_to_label'  : type_to_label
10
                 , 'type_to_number' : type_to_number
11
                 , 'class_to_label' : class_to_label
12
                 , 'class_to_number': class_to_number
13
14
                 // For testing
15
                 , 'transpose'     : transpose
16
                 , 'mk_type_labels': mk_type_labels
17
                 }
18
19
var TYPE_LABELS   = mk_type_labels()
20
  , CLASS_LABELS  = mk_class_labels()
21
  , TYPE_NUMBERS  = transpose(TYPE_LABELS)
22
  , CLASS_NUMBERS = transpose(CLASS_LABELS)
23
24
function swap_type(obj) {
25
  return (typeof obj == 'string') ? type_to_number(obj) : type_to_label(obj)
26
}
27
28
function swap_class(obj) {
29
  return (typeof obj == 'string') ? class_to_number(obj) : class_to_label(obj)
30
}
31
32
function type_to_label(type) {
33
  if(isNaN(type) || typeof type != 'number' || type < 1 || type > 65535)
34
    throw new Error('Invalid record type: ' + type)
35
  return TYPE_LABELS[type]
36
}
37
38
function type_to_number(type) {
39
  if(typeof type != 'string')
40
    throw new Error('Type must be string: ' + type)
41
42
  var num = TYPE_NUMBERS[type]
43
  if(!num)
44
    throw new Error('No such type label: ' + type)
45
  else
46
    return num
47
}
48
49
function class_to_label(clas) {
50
  if(isNaN(clas) || typeof clas != 'number' || clas < 1 || clas > 65535)
51
    throw new Error('Invalid record class: ' + clas)
52
  return CLASS_LABELS[clas]
53
}
54
55
function class_to_number(clas) {
56
  if(typeof clas != 'string')
57
    throw new Error('Type must be string: ' + clas)
58
59
  var num = CLASS_NUMBERS[clas]
60
  if(!num)
61
    throw new Error('No such clas label: ' + clas)
62
  else
63
    return num
64
}
65
66
//
67
// Utilities
68
//
69
70
function transpose(obj) {
71
  var result = {}
72
  Object.keys(obj).forEach(function(key) {
73
    var val = obj[key]
74
    if(typeof val == 'string')
75
      result[val] = +key
76
  })
77
78
  return result
79
}
80
81
function mk_class_labels() {
82
  var classes =
83
    { 0: 'reserved'
84
    , 1: 'IN'
85
    , 2: null
86
    , 3: 'CH'
87
    , 4: 'HS'
88
    // 5 - 127 unassigned classes
89
    // 128 - 253 unassigned qclasses
90
    , 254: 'NONE'
91
    , 255: '*'
92
    // 256 - 32767 unassigned
93
    // 32768 - 57343 unassigned
94
    // 57344 - 65279 unassigned qclasses and metaclasses
95
    // 65280 - 65534 Private use
96
    , 65535: 'reserved'
97
    }
98
99
  var unassigned = [ [5,253], [256,65279] ]
100
  unassigned.forEach(function(pair) {
101
    var start = pair[0], stop = pair[1]
102
    for(var i = start; i <= stop; i++)
103
      classes[i] = null
104
  })
105
106
  for(var i = 65280; i <= 65534; i++)
107
    classes[i] = 'Private use'
108
109
  return classes
110
}
111
112
function mk_type_labels() {
113
  var types =
114
    { 0: null
115
    , 1: 'A'
116
    , 2: 'NS'
117
    , 3: 'MD'
118
    , 4: 'MF'
119
    , 5: 'CNAME'
120
    , 6: 'SOA'
121
    , 7: 'MB'
122
    , 8: 'MG'
123
    , 9: 'MR'
124
    , 10: 'NULL'
125
    , 11: 'WKS'
126
    , 12: 'PTR'
127
    , 13: 'HINFO'
128
    , 14: 'MINFO'
129
    , 15: 'MX'
130
    , 16: 'TXT'
131
    , 17: 'RP'
132
    , 18: 'AFSDB'
133
    , 19: 'X25'
134
    , 20: 'ISDN'
135
    , 21: 'RT'
136
    , 22: 'NSAP'
137
    , 23: 'NSAP-PTR'
138
    , 24: 'SIG'
139
    , 25: 'KEY'
140
    , 26: 'PX'
141
    , 27: 'GPOS'
142
    , 28: 'AAAA'
143
    , 29: 'LOC'
144
    , 30: 'NXT'
145
    , 31: 'EID'
146
    , 32: 'NIMLOC'
147
    , 33: 'SRV'
148
    , 34: 'ATMA'
149
    , 35: 'NAPTR'
150
    , 36: 'KX'
151
    , 37: 'CERT'
152
    , 38: 'A6'
153
    , 39: 'DNAME'
154
    , 40: 'SINK'
155
    , 41: 'OPT'
156
    , 42: 'APL'
157
    , 43: 'DS'
158
    , 44: 'SSHFP'
159
    , 45: 'IPSECKEY'
160
    , 46: 'RRSIG'
161
    , 47: 'NSEC'
162
    , 48: 'DNSKEY'
163
    , 49: 'DHCID'
164
    , 50: 'NSEC3'
165
    , 51: 'NSEC3PARAM'
166
    , 52: 'TLSA'
167
    // 53 - 54 unassigned
168
    , 55: 'HIP'
169
    , 56: 'NINFO'
170
    , 57: 'RKEY'
171
    , 58: 'TALINK'
172
    , 59: 'CDS'
173
    // 60 - 98 unassigned
174
    , 99: 'SPF'
175
    , 100: 'UINFO'
176
    , 101: 'UID'
177
    , 102: 'GID'
178
    , 103: 'UNSPEC'
179
    , 104: 'NID'
180
    , 105: 'L32'
181
    , 106: 'L64'
182
    , 107: 'LP'
183
    // 108 - 248 unassigned
184
    , 249: 'TKEY'
185
    , 250: 'TSIG'
186
    , 251: 'IXFR'
187
    , 252: 'AXFR'
188
    , 253: 'MAILB'
189
    , 254: 'MAILA'
190
    , 255: '*'
191
    , 256: 'URI'
192
    , 257: 'CAA'
193
    // 258 - 32767 unassigned
194
    , 32768: 'TA'
195
    , 32769: 'DLV'
196
    // 32770 - 65279 unassigned
197
    // 65280 - 65534 Private use
198
    , 65535: 'Reserved'
199
    }
200
201
  var unassigned = [ [53,54], [60,98], [108,248], [258,32767], [32770,65279] ]
202
  unassigned.forEach(function(pair) {
203
    var start = pair[0], stop = pair[1]
204
    for(var i = start; i <= stop; i++)
205
      types[i] = null
206
  })
207
208
  for(var i = 65280; i <= 65534; i++)
209
    types[i] = 'Private use'
210
211
  return types
212
}
213