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package Robots::Validate; |
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# ABSTRACT: Validate that IP addresses are associated with known robots |
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925
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use v5.10; |
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use Moo 1; |
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7637
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2159
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use MooX::Const v0.4.0; |
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176196
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use List::Util 1.33 qw/ first none /; |
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use Net::DNS::Resolver; |
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use Ref::Util qw/ is_plain_hashref /; |
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592
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1
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69
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use Types::Standard -types; |
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# RECOMMEND PREREQ: Type::Tiny::XS |
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# RECOMMEND PREREQ: Ref::Util::XS |
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4883
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use namespace::autoclean; |
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our $VERSION = 'v0.2.4'; |
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has resolver => ( |
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is => 'lazy', |
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isa => InstanceOf ['Net::DNS::Resolver'], |
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builder => 1, |
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); |
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29
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sub _build_resolver { |
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return Net::DNS::Resolver->new; |
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} |
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33
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34
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has robots => ( |
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is => 'const', |
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isa => ArrayRef [ |
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Dict [ |
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name => Str, |
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agent => Optional [RegexpRef], |
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domain => RegexpRef, |
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] |
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], |
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lazy => 1, |
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strict => 0, |
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builder => 1, |
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); |
47
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48
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sub _build_robots { |
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return [ |
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51
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{ |
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name => 'Applebot', |
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agent => qr/\bApplebot\b/, |
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domain => qr/\.applebot\.apple\.com$/, |
55
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}, |
56
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57
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{ |
58
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name => 'Arquivo.pt', |
59
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agent => qr/arquivo-web-crawler/, |
60
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domain => qr/\.arquivo\.pt$/, |
61
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}, |
62
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63
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{ |
64
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name => 'Baidu', |
65
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agent => qr/\bBaiduspider\b/, |
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domain => qr/\.crawl\.baidu\.com$/, |
67
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68
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}, |
69
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70
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{ |
71
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name => 'Bing', |
72
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agent => qr/\b(?:Bingbot|MSNBot|AdIdxBot|BingPreview)\b/i, |
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domain => qr/\.search\.msn\.com$/, |
74
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75
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}, |
76
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77
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{ |
78
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name => 'CocCoc', |
79
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agent => qr/\bcoccocbot-web\b/, |
80
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domain => qr/\.coccoc\.com$/, |
81
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}, |
82
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83
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{ |
84
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name => 'Embedly', |
85
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agent => qr/\bEmbedly\b/, |
86
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domain => qr/\.embed\.ly$/, |
87
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}, |
88
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89
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{ |
90
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name => 'Exabot', |
91
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agent => qr/\bExabot\b/i, |
92
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domain => qr/\.exabot\.com$/, |
93
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}, |
94
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95
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{ |
96
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name => 'Google', |
97
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agent => qr/\bGoogle(?:bot?)\b/i, |
98
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domain => qr/\.google(?:bot)?\.com$/, |
99
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}, |
100
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101
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{ |
102
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name => 'IONOS', |
103
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agent => qr/\bIonCrawl\b/, |
104
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domain => qr/\.1and1\.org$/, |
105
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}, |
106
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107
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{ |
108
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name => 'LinkedIn', |
109
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agent => qr/\bLinkedInBot\b/, |
110
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domain => qr/\.linkedin\.com$/, |
111
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}, |
112
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113
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{ |
114
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name => 'Mojeek', |
115
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agent => qr/\bMojeekBot\b/, |
116
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domain => qr/\.mojeek\.com$/, |
117
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}, |
118
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119
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{ |
120
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name => 'Neevabot', |
121
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agent => qr/\bNeevabot\b/, |
122
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domain => qr/\.neevabot\.com$/, |
123
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}, |
124
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125
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{ |
126
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name => 'PetalBot', |
127
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agent => qr/\bPetalBot\b/, |
128
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domain => qr/\.petalsearch\.com$/, |
129
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}, |
130
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131
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{ |
132
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name => 'Pinterest', |
133
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agent => qr/\bPinterest\b/, |
134
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domain => qr/\.pinterest\.com$/, |
135
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}, |
136
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137
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{ |
138
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name => 'Qwant', |
139
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agent => qr/\bQwantify\b/, |
140
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domain => qr/\.qwant\.com$/, |
141
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}, |
142
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143
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{ |
144
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name => 'SeznamBot', |
145
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agent => qr/\bSeznam\b/, |
146
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domain => qr/\.seznam\.cz$/, |
147
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}, |
148
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149
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{ |
150
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name => 'Sogou', |
151
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agent => qr/\bSogou\b/, |
152
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domain => qr/\.sogou\.com$/, |
153
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}, |
154
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155
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{ |
156
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name => 'Yahoo', |
157
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agent => qr/yahoo/i, |
158
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domain => qr/\.crawl\.yahoo\.net$/, |
159
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160
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}, |
161
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162
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{ |
163
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name => "Yandex", |
164
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agent => qr/Yandex/, |
165
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domain => qr/\.yandex\.(?:com|ru|net)$/, |
166
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}, |
167
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168
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{ |
169
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name => 'Yeti', |
170
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agent => qr/\bnaver\.me\b/, |
171
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domain => qr/\.naver\.com$/, |
172
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}, |
173
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174
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]; |
175
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} |
176
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177
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178
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has die_on_error => ( |
179
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is => 'lazy', |
180
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isa => Bool, |
181
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default => 0, |
182
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); |
183
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184
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185
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sub validate { |
186
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5
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5
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1
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10853
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my ( $self, $ip, $args ) = @_; |
187
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188
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5
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100
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66
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23
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if (is_plain_hashref($ip) && !$args) { |
189
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1
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4
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$args = { agent => $ip->{HTTP_USER_AGENT} }; |
190
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1
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3
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$ip = $ip->{REMOTE_ADDR}; |
191
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} |
192
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193
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5
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121
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my $res = $self->resolver; |
194
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195
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# Reverse DNS |
196
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197
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5
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40
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my $hostname; |
198
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199
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5
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100
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27
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if ( my $reply = $res->query($ip, 'PTR') ) { |
200
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4
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1084
|
($hostname) = map { $_->ptrdname } $reply->answer; |
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4
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45
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201
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} |
202
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else { |
203
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1
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50
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286
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die $res->errorstring if $self->die_on_error; |
204
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} |
205
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206
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5
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100
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101
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return unless $hostname; |
207
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208
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4
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100
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23
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$args //= {}; |
209
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210
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4
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6
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my $agent = $args->{agent}; |
211
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my @matches = |
212
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4
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100
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8
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grep { !$agent || $agent =~ $_->{agent} } @{ $self->robots }; |
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4
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98
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4
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87
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213
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214
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4
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50
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0
|
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22
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my $reply = $res->search( $hostname, "A" ) |
215
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|
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or $self->die_on_error && die $res->errorstring; |
216
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217
|
4
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50
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|
739
|
return unless $reply; |
218
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219
|
4
|
50
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25
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if ( |
220
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4
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4
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57
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none { $_ eq $ip } ( |
221
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4
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|
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12
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map { $_->address } |
222
|
4
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37
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grep { $_->can('address') } $reply->answer |
223
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|
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) |
224
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|
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) |
225
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{ |
226
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0
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0
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return; |
227
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if ( my $match = first { $hostname =~ $_->{domain} } @matches ) { |
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return { |
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%$match, |
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hostname => $hostname, |
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ip_address => $ip, |
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}; |
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} |
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} |
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1; |
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__END__ |
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=pod |
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=encoding UTF-8 |
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=head1 NAME |
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Robots::Validate - Validate that IP addresses are associated with known robots |
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=head1 VERSION |
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version v0.2.4 |
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=head1 SYNOPSIS |
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use Robots::Validate; |
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my $rv = Robots::Validate->new; |
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... |
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if ( $rs->validate( $ip, \%opts ) ) { ... } |
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=head1 DESCRIPTION |
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=head1 ATTRIBUTES |
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=head2 C<resolver> |
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This is the L<Net::DNS::Resolver> used for DNS lookups. |
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=head2 C<robots> |
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This is an array reference of rules with information about |
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robots. Each item is a hash reference with the following keys: |
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=over |
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=item C<name> |
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The name of the robot. |
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=item C<agent> |
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A regular expression for matching against user agent names. |
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=item C<domain> |
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A regular expression for matching against the hostname. |
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=back |
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=head2 C<die_on_error> |
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When true, L</validate> will die on a L</resolver> failure. |
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By default it is false. |
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=head1 METHODS |
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=head2 C<validate> |
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my $result = $rv->validate( $ip, \%opts ); |
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This method attempts to validate that an IP address belongs to a known |
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robot by first looking up the hostname that corresponds to the IP address, |
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and then validating that the hostname resolves to that IP address. |
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If this succeeds, it then checks if the hostname is associated with a |
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known web robot. |
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317
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If that succeeds, it returns a copy of the matched rule from L</robots>. |
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319
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You can specify the following C<%opts>: |
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321
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=over |
322
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323
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=item C<agent> |
324
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325
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This is the user-agent string. If it does not match, then the DNS lookkups |
326
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will not be performed. |
327
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328
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It is optional. |
329
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330
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=back |
331
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332
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Alternatively, you can pass in a Plack environment: |
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334
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my $result = $rv->validate($env); |
335
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336
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=head1 KNOWN ISSUES |
337
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338
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=head2 Undocumented Rules |
339
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340
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Many of these rules are not documented, but have been guessed from web |
341
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traffic. |
342
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343
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=head2 Limitations |
344
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345
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The current module can only be used for systems that consistently |
346
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support reverse DNS lookups. This means that it cannot be used to |
347
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validate some robots from |
348
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L<Facebook|https://developers.facebook.com/docs/sharing/webmasters/crawler> |
349
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or Twitter. |
350
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351
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=head1 SEE ALSO |
352
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353
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=over |
354
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355
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=item L<Verifying Bingbot|https://www.bing.com/webmaster/help/how-to-verify-bingbot-3905dc26> |
356
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357
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=item L<Verifying Googlebot|https://support.google.com/webmasters/answer/80553> |
358
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359
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=item L<How to check that a robot belongs to Yandex|https://yandex.com/support/webmaster/robot-workings/check-yandex-robots.html> |
360
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361
|
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=back |
362
|
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363
|
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|
=head1 SOURCE |
364
|
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365
|
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The development version is on github at L<https://github.com/robrwo/Robots-Validate> |
366
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and may be cloned from L<git://github.com/robrwo/Robots-Validate.git> |
367
|
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368
|
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|
=head1 BUGS |
369
|
|
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370
|
|
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|
Please report any bugs or feature requests on the bugtracker website |
371
|
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|
L<https://github.com/robrwo/Robots-Validate/issues> |
372
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373
|
|
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|
|
When submitting a bug or request, please include a test-file or a |
374
|
|
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|
|
patch to an existing test-file that illustrates the bug or desired |
375
|
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feature. |
376
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377
|
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|
=head1 AUTHOR |
378
|
|
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379
|
|
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|
Robert Rothenberg <rrwo@cpan.org> |
380
|
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381
|
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=head1 COPYRIGHT AND LICENSE |
382
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383
|
|
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|
This software is Copyright (c) 2018-2021 by Robert Rothenberg. |
384
|
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385
|
|
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|
This is free software, licensed under: |
386
|
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387
|
|
|
|
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|
|
The Artistic License 2.0 (GPL Compatible) |
388
|
|
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389
|
|
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=cut |