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
|
%%%----------------------------------------------------------------------
%%% File : idna.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Support for IDNA (RFC3490)
%%% Created : 10 Apr 2004 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(idna).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
%-compile(export_all).
-export([domain_utf8_to_ascii/1,
domain_ucs2_to_ascii/1]).
domain_utf8_to_ascii(Domain) ->
domain_ucs2_to_ascii(utf8_to_ucs2(Domain)).
utf8_to_ucs2(S) ->
utf8_to_ucs2(S, "").
utf8_to_ucs2([], R) ->
lists:reverse(R);
utf8_to_ucs2([C | S], R) when C < 16#80 ->
utf8_to_ucs2(S, [C | R]);
utf8_to_ucs2([C1, C2 | S], R) when C1 < 16#E0 ->
utf8_to_ucs2(S, [((C1 band 16#1F) bsl 6) bor
(C2 band 16#3F) | R]);
utf8_to_ucs2([C1, C2, C3 | S], R) when C1 < 16#F0 ->
utf8_to_ucs2(S, [((C1 band 16#0F) bsl 12) bor
((C2 band 16#3F) bsl 6) bor
(C3 band 16#3F) | R]).
domain_ucs2_to_ascii(Domain) ->
case catch domain_ucs2_to_ascii1(Domain) of
{'EXIT', _Reason} ->
false;
Res ->
Res
end.
domain_ucs2_to_ascii1(Domain) ->
Parts = string:tokens(Domain, [16#002E, 16#3002, 16#FF0E, 16#FF61]),
ASCIIParts = lists:map(fun(P) ->
to_ascii(P)
end, Parts),
string:strip(lists:flatmap(fun(P) -> [$. | P] end, ASCIIParts),
left, $.).
% Domain names are already nameprep'ed in ejabberd, so we skiping this step
to_ascii(Name) ->
false = lists:any(
fun(C) when
( 0 =< C) and (C =< 16#2C) or
(16#2E =< C) and (C =< 16#2F) or
(16#3A =< C) and (C =< 16#40) or
(16#5B =< C) and (C =< 16#60) or
(16#7B =< C) and (C =< 16#7F) ->
true;
(_) ->
false
end, Name),
case Name of
[H | _] when H /= $- ->
true = lists:last(Name) /= $-
end,
ASCIIName = case lists:any(fun(C) -> C > 16#7F end, Name) of
true ->
true = case Name of
"xn--" ++ _ -> false;
_ -> true
end,
"xn--" ++ punycode_encode(Name);
false ->
Name
end,
L = length(ASCIIName),
true = (1 =< L) and (L =< 63),
ASCIIName.
%%% PUNYCODE (RFC3492)
-define(BASE, 36).
-define(TMIN, 1).
-define(TMAX, 26).
-define(SKEW, 38).
-define(DAMP, 700).
-define(INITIAL_BIAS, 72).
-define(INITIAL_N, 128).
punycode_encode(Input) ->
N = ?INITIAL_N,
Delta = 0,
Bias = ?INITIAL_BIAS,
Basic = lists:filter(fun(C) -> C =< 16#7f end, Input),
NonBasic = lists:filter(fun(C) -> C > 16#7f end, Input),
L = length(Input),
B = length(Basic),
SNonBasic = lists:usort(NonBasic),
Output1 = if
B > 0 -> Basic ++ "-";
true -> ""
end,
Output2 = punycode_encode1(Input, SNonBasic, B, B, L, N, Delta, Bias, ""),
Output1 ++ Output2.
punycode_encode1(Input, [M | SNonBasic], B, H, L, N, Delta, Bias, Out)
when H < L ->
Delta1 = Delta + (M - N) * (H + 1),
% let n = m
{NewDelta, NewBias, NewH, NewOut} =
lists:foldl(
fun(C, {ADelta, ABias, AH, AOut}) ->
if
C < M ->
{ADelta + 1, ABias, AH, AOut};
C == M ->
NewOut = punycode_encode_delta(ADelta, ABias, AOut),
NewBias = adapt(ADelta, H + 1, H == B),
{0, NewBias, AH + 1, NewOut};
true ->
{ADelta, ABias, AH, AOut}
end
end, {Delta1, Bias, H, Out}, Input),
punycode_encode1(
Input, SNonBasic, B, NewH, L, M + 1, NewDelta + 1, NewBias, NewOut);
punycode_encode1(Input, SNonBasic, B, H, L, N, Delta, Bias, Out) ->
lists:reverse(Out).
punycode_encode_delta(Delta, Bias, Out) ->
punycode_encode_delta(Delta, Bias, Out, ?BASE).
punycode_encode_delta(Delta, Bias, Out, K) ->
T = if
K =< Bias -> ?TMIN;
K >= Bias + ?TMAX -> ?TMAX;
true -> K - Bias
end,
if
Delta < T ->
[codepoint(Delta) | Out];
true ->
C = T + ((Delta - T) rem (?BASE - T)),
punycode_encode_delta((Delta - T) div (?BASE - T), Bias,
[codepoint(C) | Out], K + ?BASE)
end.
adapt(Delta, NumPoints, FirstTime) ->
Delta1 = if
FirstTime -> Delta div ?DAMP;
true -> Delta div 2
end,
Delta2 = Delta1 + (Delta1 div NumPoints),
adapt1(Delta2, 0).
adapt1(Delta, K) ->
if
Delta > ((?BASE - ?TMIN) * ?TMAX) div 2 ->
adapt1(Delta div (?BASE - ?TMIN), K + ?BASE);
true ->
K + (((?BASE - ?TMIN + 1) * Delta) div (Delta + ?SKEW))
end.
codepoint(C) ->
if
(0 =< C) and (C =< 25) ->
C + 97;
(26 =< C) and (C =< 35) ->
C + 22
end.
|
