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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
package uasurfer
import (
"strings"
)
// Browser struct contains the lowercase name of the browser, along
// with its browser version number. Browser are grouped together without
// consideration for device. For example, Chrome (Chrome/43.0) and Chrome for iOS
// (CriOS/43.0) would both return as "chrome" (name) and 43.0 (version). Similarly
// Internet Explorer 11 and Edge 12 would return as "ie" and "11" or "12", respectively.
// type Browser struct {
// Name BrowserName
// Version struct {
// Major int
// Minor int
// Patch int
// }
// }
// Retrieve browser name from UA strings
func (u *UserAgent) evalBrowserName(ua string) bool {
// Blackberry goes first because it reads as MSIE & Safari
if strings.Contains(ua, "blackberry") || strings.Contains(ua, "playbook") || strings.Contains(ua, "bb10") || strings.Contains(ua, "rim ") {
u.Browser.Name = BrowserBlackberry
return u.isBot()
}
if strings.Contains(ua, "applewebkit") {
switch {
case strings.Contains(ua, "googlebot"):
u.Browser.Name = BrowserGoogleBot
case strings.Contains(ua, "opr/") || strings.Contains(ua, "opios/"):
u.Browser.Name = BrowserOpera
case strings.Contains(ua, "silk/"):
u.Browser.Name = BrowserSilk
case strings.Contains(ua, "edge/") || strings.Contains(ua, "iemobile/") || strings.Contains(ua, "msie "):
u.Browser.Name = BrowserIE
case strings.Contains(ua, "ucbrowser/") || strings.Contains(ua, "ucweb/"):
u.Browser.Name = BrowserUCBrowser
// Edge, Silk and other chrome-identifying browsers must evaluate before chrome, unless we want to add more overhead
case strings.Contains(ua, "chrome/") || strings.Contains(ua, "crios/") || strings.Contains(ua, "chromium/") || strings.Contains(ua, "crmo/"):
u.Browser.Name = BrowserChrome
case strings.Contains(ua, "android") && !strings.Contains(ua, "chrome/") && strings.Contains(ua, "version/") && !strings.Contains(ua, "like android"):
// Android WebView on Android >= 4.4 is purposefully being identified as Chrome above -- https://developer.chrome.com/multidevice/webview/overview
u.Browser.Name = BrowserAndroid
case strings.Contains(ua, "fxios"):
u.Browser.Name = BrowserFirefox
case strings.Contains(ua, " spotify/"):
u.Browser.Name = BrowserSpotify
// AppleBot uses webkit signature as well
case strings.Contains(ua, "applebot"):
u.Browser.Name = BrowserAppleBot
// presume it's safari unless an esoteric browser is being specified (webOSBrowser, SamsungBrowser, etc.)
case strings.Contains(ua, "like gecko") && strings.Contains(ua, "mozilla/") && strings.Contains(ua, "safari/") && !strings.Contains(ua, "linux") && !strings.Contains(ua, "android") && !strings.Contains(ua, "browser/") && !strings.Contains(ua, "os/"):
u.Browser.Name = BrowserSafari
// if we got this far and the device is iPhone or iPad, assume safari. Some agents don't actually contain the word "safari"
case strings.Contains(ua, "iphone") || strings.Contains(ua, "ipad"):
u.Browser.Name = BrowserSafari
// Google's search app on iPhone, leverages native Safari rather than Chrome
case strings.Contains(ua, " gsa/"):
u.Browser.Name = BrowserSafari
default:
goto notwebkit
}
return u.isBot()
}
notwebkit:
switch {
case strings.Contains(ua, "msie") || strings.Contains(ua, "trident"):
u.Browser.Name = BrowserIE
case strings.Contains(ua, "gecko") && (strings.Contains(ua, "firefox") || strings.Contains(ua, "iceweasel") || strings.Contains(ua, "seamonkey") || strings.Contains(ua, "icecat")):
u.Browser.Name = BrowserFirefox
case strings.Contains(ua, "presto") || strings.Contains(ua, "opera"):
u.Browser.Name = BrowserOpera
case strings.Contains(ua, "ucbrowser"):
u.Browser.Name = BrowserUCBrowser
case strings.Contains(ua, "applebot"):
u.Browser.Name = BrowserAppleBot
case strings.Contains(ua, "baiduspider"):
u.Browser.Name = BrowserBaiduBot
case strings.Contains(ua, "adidxbot") || strings.Contains(ua, "bingbot") || strings.Contains(ua, "bingpreview"):
u.Browser.Name = BrowserBingBot
case strings.Contains(ua, "duckduckbot"):
u.Browser.Name = BrowserDuckDuckGoBot
case strings.Contains(ua, "facebot") || strings.Contains(ua, "facebookexternalhit"):
u.Browser.Name = BrowserFacebookBot
case strings.Contains(ua, "googlebot"):
u.Browser.Name = BrowserGoogleBot
case strings.Contains(ua, "linkedinbot"):
u.Browser.Name = BrowserLinkedInBot
case strings.Contains(ua, "msnbot"):
u.Browser.Name = BrowserMsnBot
case strings.Contains(ua, "pingdom.com_bot"):
u.Browser.Name = BrowserPingdomBot
case strings.Contains(ua, "twitterbot"):
u.Browser.Name = BrowserTwitterBot
case strings.Contains(ua, "yandex") || strings.Contains(ua, "yadirectfetcher"):
u.Browser.Name = BrowserYandexBot
case strings.Contains(ua, "yahoo"):
u.Browser.Name = BrowserYahooBot
case strings.Contains(ua, "phantomjs"):
u.Browser.Name = BrowserBot
default:
u.Browser.Name = BrowserUnknown
}
return u.isBot()
}
// Retrieve browser version
// Methods used in order:
// 1st: look for generic version/#
// 2nd: look for browser-specific instructions (e.g. chrome/34)
// 3rd: infer from OS (iOS only)
func (u *UserAgent) evalBrowserVersion(ua string) {
// if there is a 'version/#' attribute with numeric version, use it -- except for Chrome since Android vendors sometimes hijack version/#
if u.Browser.Name != BrowserChrome && u.Browser.Version.findVersionNumber(ua, "version/") {
return
}
switch u.Browser.Name {
case BrowserChrome:
// match both chrome and crios
_ = u.Browser.Version.findVersionNumber(ua, "chrome/") || u.Browser.Version.findVersionNumber(ua, "crios/") || u.Browser.Version.findVersionNumber(ua, "crmo/")
case BrowserIE:
if u.Browser.Version.findVersionNumber(ua, "msie ") || u.Browser.Version.findVersionNumber(ua, "edge/") {
return
}
// get MSIE version from trident version https://en.wikipedia.org/wiki/Trident_(layout_engine)
if u.Browser.Version.findVersionNumber(ua, "trident/") {
// convert trident versions 3-7 to MSIE version
if (u.Browser.Version.Major >= 3) && (u.Browser.Version.Major <= 7) {
u.Browser.Version.Major += 4
}
}
case BrowserFirefox:
_ = u.Browser.Version.findVersionNumber(ua, "firefox/") || u.Browser.Version.findVersionNumber(ua, "fxios/")
case BrowserSafari: // executes typically if we're on iOS and not using a familiar browser
u.Browser.Version = u.OS.Version
// early Safari used a version number +1 to OS version
if (u.Browser.Version.Major <= 3) && (u.Browser.Version.Major >= 1) {
u.Browser.Version.Major++
}
case BrowserUCBrowser:
_ = u.Browser.Version.findVersionNumber(ua, "ucbrowser/")
case BrowserOpera:
_ = u.Browser.Version.findVersionNumber(ua, "opr/") || u.Browser.Version.findVersionNumber(ua, "opios/") || u.Browser.Version.findVersionNumber(ua, "opera/")
case BrowserSilk:
_ = u.Browser.Version.findVersionNumber(ua, "silk/")
case BrowserSpotify:
_ = u.Browser.Version.findVersionNumber(ua, "spotify/")
}
}
|
