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// Copyright (C) 2014 Miquel Sabaté Solà <mikisabate@gmail.com>
// This file is licensed under the MIT license.
// See the LICENSE file.
package user_agent
import (
"regexp"
"strings"
)
// Get the name of the bot from the website that may be in the given comment. If
// there is no website in the comment, then an empty string is returned.
func getFromSite(comment []string) string {
if len(comment) == 0 {
return ""
}
// Where we should check the website.
idx := 2
if len(comment) < 3 {
idx = 0
}
// Pick the site.
re := regexp.MustCompile("http://.+\\.\\w+")
results := re.FindStringSubmatch(comment[idx])
if len(results) == 1 {
// If it's a simple comment, just return the name of the site.
if idx == 0 {
return results[0]
}
// This is a large comment, usually the name will be in the previous
// field of the comment.
return strings.TrimSpace(comment[1])
}
return ""
}
// Returns true if the info that we currently have corresponds to the Google
// mobile bot. This function also modifies some attributes in the receiver
// accordingly.
func (p *UserAgent) googleBot() bool {
// This is a hackish way to detect Google's mobile bot.
if strings.Index(p.ua, "Googlebot") != -1 {
p.platform = ""
p.undecided = true
}
return p.undecided
}
// Set the attributes of the receiver as given by the parameters. All the other
// parameters are set to empty.
func (p *UserAgent) setSimple(name, version string, bot bool) {
p.bot = bot
if !bot {
p.mozilla = ""
}
p.browser.Name = name
p.browser.Version = version
p.browser.Engine = ""
p.browser.EngineVersion = ""
p.os = ""
p.localization = ""
}
// Fix some values for some weird browsers.
func (p *UserAgent) fixOther(sections []section) {
if len(sections) > 0 {
p.browser.Name = sections[0].name
p.browser.Version = sections[0].version
p.mozilla = ""
}
}
// Check if we're dealing with a bot or with some weird browser. If that is the
// case, the receiver will be modified accordingly.
func (p *UserAgent) checkBot(sections []section) {
// If there's only one element, and it's doesn't have the Mozilla string,
// check whether this is a bot or not.
if len(sections) == 1 && sections[0].name != "Mozilla" {
p.mozilla = ""
// Check whether the name has some suspicious "bot" in his name.
reg, _ := regexp.Compile("(?i)bot")
if reg.Match([]byte(sections[0].name)) {
p.setSimple(sections[0].name, "", true)
return
}
// Tough luck, let's try to see if it has a website in his comment.
if name := getFromSite(sections[0].comment); name != "" {
// First of all, this is a bot. Moreover, since it doesn't have the
// Mozilla string, we can assume that the name and the version are
// the ones from the first section.
p.setSimple(sections[0].name, sections[0].version, true)
return
}
// At this point we are sure that this is not a bot, but some weirdo.
p.setSimple(sections[0].name, sections[0].version, false)
} else {
// Let's iterate over the available comments and check for a website.
for _, v := range sections {
if name := getFromSite(v.comment); name != "" {
// Ok, we've got a bot name.
results := strings.SplitN(name, "/", 2)
version := ""
if len(results) == 2 {
version = results[1]
}
p.setSimple(results[0], version, true)
return
}
}
// We will assume that this is some other weird browser.
p.fixOther(sections)
}
}
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