435 lines
9.2 KiB
Go
435 lines
9.2 KiB
Go
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package ua
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import (
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"bytes"
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"regexp"
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"strings"
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)
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// UserAgent struct containg all determined datra from parsed user-agent string
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type UserAgent struct {
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Name string
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Version string
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OS string
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OSVersion string
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Device string
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Mobile bool
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Tablet bool
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Desktop bool
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Bot bool
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URL string
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String string
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}
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var ignore = map[string]struct{}{
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"KHTML, like Gecko": struct{}{},
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"U": struct{}{},
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"compatible": struct{}{},
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"Mozilla": struct{}{},
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"WOW64": struct{}{},
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}
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// Constants for browsers and operating systems for easier comparation
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const (
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Windows = "Windows"
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WindowsPhone = "Windows Phone"
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Android = "Android"
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MacOS = "macOS"
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IOS = "iOS"
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Linux = "Linux"
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Opera = "Opera"
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OperaMini = "Opera Mini"
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OperaTouch = "Opera Touch"
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Chrome = "Chrome"
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Firefox = "Firefox"
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InternetExplorer = "Internet Explorer"
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Safari = "Safari"
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Edge = "Edge"
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Vivaldi = "Vivaldi"
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Googlebot = "Googlebot"
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Twitterbot = "Twitterbot"
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FacebookExternalHit = "facebookexternalhit"
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Applebot = "Applebot"
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)
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// Parse user agent string returning UserAgent struct
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func Parse(userAgent string) UserAgent {
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ua := UserAgent{
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String: userAgent,
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}
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tokens := parse(userAgent)
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// check is there URL
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for k := range tokens {
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if strings.HasPrefix(k, "http://") || strings.HasPrefix(k, "https://") {
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ua.URL = k
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delete(tokens, k)
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break
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}
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}
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// OS lookup
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switch {
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case tokens.exists("Android"):
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ua.OS = Android
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ua.OSVersion = tokens[Android]
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for s := range tokens {
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if strings.HasSuffix(s, "Build") {
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ua.Device = strings.TrimSpace(s[:len(s)-5])
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ua.Tablet = strings.Contains(strings.ToLower(ua.Device), "tablet")
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}
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}
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case tokens.exists("iPhone"):
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ua.OS = IOS
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ua.OSVersion = tokens.findMacOSVersion()
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ua.Device = "iPhone"
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ua.Mobile = true
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case tokens.exists("iPad"):
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ua.OS = IOS
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ua.OSVersion = tokens.findMacOSVersion()
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ua.Device = "iPad"
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ua.Tablet = true
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case tokens.exists("Windows NT"):
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ua.OS = Windows
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ua.OSVersion = tokens["Windows NT"]
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ua.Desktop = true
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case tokens.exists("Windows Phone OS"):
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ua.OS = WindowsPhone
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ua.OSVersion = tokens["Windows Phone OS"]
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ua.Mobile = true
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case tokens.exists("Macintosh"):
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ua.OS = MacOS
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ua.OSVersion = tokens.findMacOSVersion()
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ua.Desktop = true
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case tokens.exists("Linux"):
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ua.OS = Linux
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ua.OSVersion = tokens[Linux]
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ua.Desktop = true
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}
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// for s, val := range sys {
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// fmt.Println(s, "--", val)
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// }
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switch {
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case tokens.exists("Googlebot"):
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ua.Name = Googlebot
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ua.Version = tokens[Googlebot]
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ua.Bot = true
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens.exists("Applebot"):
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ua.Name = Applebot
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ua.Version = tokens[Applebot]
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ua.Bot = true
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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ua.OS = ""
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case tokens["Opera Mini"] != "":
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ua.Name = OperaMini
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ua.Version = tokens[OperaMini]
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ua.Mobile = true
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case tokens["OPR"] != "":
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ua.Name = Opera
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ua.Version = tokens["OPR"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["OPT"] != "":
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ua.Name = OperaTouch
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ua.Version = tokens["OPT"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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// Opera on iOS
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case tokens["OPiOS"] != "":
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ua.Name = Opera
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ua.Version = tokens["OPiOS"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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// Chrome on iOS
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case tokens["CriOS"] != "":
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ua.Name = Chrome
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ua.Version = tokens["CriOS"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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// Firefox on iOS
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case tokens["FxiOS"] != "":
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ua.Name = Firefox
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ua.Version = tokens["FxiOS"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["Firefox"] != "":
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ua.Name = Firefox
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ua.Version = tokens[Firefox]
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_, ua.Mobile = tokens["Mobile"]
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_, ua.Tablet = tokens["Tablet"]
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case tokens["Vivaldi"] != "":
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ua.Name = Vivaldi
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ua.Version = tokens[Vivaldi]
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case tokens.exists("MSIE"):
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ua.Name = InternetExplorer
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ua.Version = tokens["MSIE"]
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case tokens["EdgiOS"] != "":
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ua.Name = Edge
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ua.Version = tokens["EdgiOS"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["Edge"] != "":
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ua.Name = Edge
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ua.Version = tokens["Edge"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["Edg"] != "":
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ua.Name = Edge
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ua.Version = tokens["Edg"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["EdgA"] != "":
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ua.Name = Edge
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ua.Version = tokens["EdgA"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["bingbot"] != "":
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ua.Name = "Bingbot"
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ua.Version = tokens["bingbot"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens["SamsungBrowser"] != "":
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ua.Name = "Samsung Browser"
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ua.Version = tokens["SamsungBrowser"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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// if chrome and Safari defined, find any other tokensent descr
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case tokens.exists(Chrome) && tokens.exists(Safari):
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name := tokens.findBestMatch(true)
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if name != "" {
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ua.Name = name
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ua.Version = tokens[name]
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break
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}
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fallthrough
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case tokens.exists("Chrome"):
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ua.Name = Chrome
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ua.Version = tokens["Chrome"]
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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case tokens.exists("Safari"):
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ua.Name = Safari
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if v, ok := tokens["Version"]; ok {
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ua.Version = v
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} else {
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ua.Version = tokens["Safari"]
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}
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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default:
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if ua.OS == "Android" && tokens["Version"] != "" {
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ua.Name = "Android browser"
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ua.Version = tokens["Version"]
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ua.Mobile = true
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} else {
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if name := tokens.findBestMatch(false); name != "" {
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ua.Name = name
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ua.Version = tokens[name]
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} else {
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ua.Name = ua.String
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}
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ua.Bot = strings.Contains(strings.ToLower(ua.Name), "bot")
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ua.Mobile = tokens.existsAny("Mobile", "Mobile Safari")
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}
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}
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// if tabler, switch mobile to off
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if ua.Tablet {
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ua.Mobile = false
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}
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// if not already bot, check some popular bots and weather URL is set
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if !ua.Bot {
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ua.Bot = ua.URL != ""
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}
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if !ua.Bot {
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switch ua.Name {
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case Twitterbot, FacebookExternalHit:
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ua.Bot = true
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}
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}
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return ua
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}
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func parse(userAgent string) (clients properties) {
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clients = make(map[string]string, 0)
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slash := false
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isURL := false
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var buff, val bytes.Buffer
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addToken := func() {
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if buff.Len() != 0 {
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s := strings.TrimSpace(buff.String())
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if _, ign := ignore[s]; !ign {
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if isURL {
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s = strings.TrimPrefix(s, "+")
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}
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if val.Len() == 0 { // only if value don't exists
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var ver string
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s, ver = checkVer(s) // determin version string and split
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clients[s] = ver
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} else {
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clients[s] = strings.TrimSpace(val.String())
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}
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}
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}
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buff.Reset()
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val.Reset()
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slash = false
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isURL = false
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}
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parOpen := false
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bua := []byte(userAgent)
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for i, c := range bua {
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//fmt.Println(string(c), c)
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switch {
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case c == 41: // )
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addToken()
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parOpen = false
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case parOpen && c == 59: // ;
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addToken()
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case c == 40: // (
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addToken()
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parOpen = true
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case slash && c == 32:
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addToken()
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case slash:
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val.WriteByte(c)
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case c == 47 && !isURL: // /
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if i != len(bua)-1 && bua[i+1] == 47 && (bytes.HasSuffix(buff.Bytes(), []byte("http:")) || bytes.HasSuffix(buff.Bytes(), []byte("https:"))) {
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buff.WriteByte(c)
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isURL = true
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} else {
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slash = true
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}
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default:
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buff.WriteByte(c)
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}
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}
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addToken()
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return clients
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}
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func checkVer(s string) (name, v string) {
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i := strings.LastIndex(s, " ")
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if i == -1 {
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return s, ""
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}
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//v = s[i+1:]
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switch s[:i] {
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case "Linux", "Windows NT", "Windows Phone OS", "MSIE", "Android":
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return s[:i], s[i+1:]
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default:
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return s, ""
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}
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// for _, c := range v {
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// if (c >= 48 && c <= 57) || c == 46 {
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// } else {
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// return s, ""
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// }
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// }
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// return s[:i], s[i+1:]
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}
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type properties map[string]string
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func (p properties) exists(key string) bool {
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_, ok := p[key]
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return ok
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}
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func (p properties) existsAny(keys ...string) bool {
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for _, k := range keys {
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if _, ok := p[k]; ok {
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return true
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}
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}
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return false
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}
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func (p properties) findMacOSVersion() string {
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for k, v := range p {
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if strings.Contains(k, "OS") {
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if ver := findVersion(v); ver != "" {
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return ver
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} else if ver = findVersion(k); ver != "" {
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return ver
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}
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}
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}
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return ""
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}
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// findBestMatch from the rest of the bunch
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// in first cycle only return key vith version value
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// if withVerValue is false, do another cycle and return any token
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func (p properties) findBestMatch(withVerOnly bool) string {
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n := 2
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if withVerOnly {
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n = 1
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}
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for i := 0; i < n; i++ {
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for k, v := range p {
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switch k {
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case Chrome, Firefox, Safari, "Version", "Mobile", "Mobile Safari", "Mozilla", "AppleWebKit", "Windows NT", "Windows Phone OS", Android, "Macintosh", Linux, "GSA":
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default:
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if i == 0 {
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|
|
if v != "" { // in first check, only return keys with value
|
||
|
|
return k
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
return k
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return ""
|
||
|
|
}
|
||
|
|
|
||
|
|
var rxMacOSVer = regexp.MustCompile("[_\\d\\.]+")
|
||
|
|
|
||
|
|
func findVersion(s string) string {
|
||
|
|
if ver := rxMacOSVer.FindString(s); ver != "" {
|
||
|
|
return strings.Replace(ver, "_", ".", -1)
|
||
|
|
}
|
||
|
|
return ""
|
||
|
|
}
|