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parser.go
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parser.go
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package samesite
import (
"regexp"
"strconv"
)
var (
iosVersion12Regexp *regexp.Regexp = regexp.MustCompile(`\(iP.+; CPU .*OS 12[_\d]*.*\)`)
macosxVersionTenFourteenRegexp *regexp.Regexp = regexp.MustCompile(`\(Macintosh;.*Mac OS X 10_14[_\d]*.*\)`)
safariRegexp *regexp.Regexp = regexp.MustCompile(`Version\/.* Safari\/`)
macEmbeddedBrowserRegexp *regexp.Regexp = regexp.MustCompile(`^Mozilla\/[\.\d]+ \(Macintosh;.*Mac OS X [_\d]+\) AppleWebKit\/[\.\d]+ \(KHTML, like Gecko\)$`)
chromiumBasedRegexp *regexp.Regexp = regexp.MustCompile(`Chrom(e|ium)/(\d+)`)
chromiumVersionRegexp *regexp.Regexp = regexp.MustCompile(`Chrom[^ \/]+\/(\d+)[\.\d]*`)
ucbrowserRegexp *regexp.Regexp = regexp.MustCompile(`UCBrowser\/`)
ucbrowserVersionRegexp *regexp.Regexp = regexp.MustCompile(`UCBrowser\/(\d+)\.(\d+)\.(\d+)[\.\d]* `)
)
// Parser is an struct with the logic to extract information from an user agent string.
type Parser struct {
userAgent string
}
// NewParser returns a parser based on custom regexp expressions.
func NewParser(userAgent string) *Parser {
return &Parser{
userAgent: userAgent,
}
}
func (c *Parser) hasWebKitSameSiteBug() bool {
return c.isIosVersionTwelve() || (c.isMacosxVersionTenFourteen() && (c.isSafari() || c.isMacEmbeddedBrowser()))
}
func (c *Parser) dropsUnrecognizedSameSiteCookies() bool {
if c.isChromiumBased() {
return c.isChromiumVersionBetweenFiftyOneandSixtySeven()
}
return c.isUcBrowser() && !c.isUcBrowserVersionAtLeastTwelveThirteenTwo()
}
func (c *Parser) isIosVersionTwelve() bool {
return iosVersion12Regexp.MatchString(c.userAgent)
}
func (c *Parser) isMacosxVersionTenFourteen() bool {
return macosxVersionTenFourteenRegexp.MatchString(c.userAgent)
}
func (c *Parser) isSafari() bool {
return safariRegexp.MatchString(c.userAgent) && !c.isChromiumBased()
}
func (c *Parser) isMacEmbeddedBrowser() bool {
return macEmbeddedBrowserRegexp.MatchString(c.userAgent)
}
func (c *Parser) isChromiumBased() bool {
return chromiumBasedRegexp.MatchString(c.userAgent)
}
func (c *Parser) isChromiumVersionBetweenFiftyOneandSixtySeven() bool {
res := chromiumVersionRegexp.FindAllStringSubmatch(c.userAgent, -1)
if len(res) == 1 {
version, _ := strconv.Atoi(res[0][1])
return (version >= 51) && (version < 67)
}
return true
}
func (c *Parser) isUcBrowser() bool {
return ucbrowserRegexp.MatchString(c.userAgent)
}
func (c *Parser) isUcBrowserVersionAtLeastTwelveThirteenTwo() bool {
twelve := 12
thirteen := 13
two := 2
res := ucbrowserVersionRegexp.FindAllStringSubmatch(c.userAgent, -1)
if len(res) == 1 {
majorVersion, _ := strconv.Atoi(res[0][1])
if majorVersion != twelve {
return majorVersion > twelve
}
minorVersion, _ := strconv.Atoi(res[0][2])
if minorVersion != thirteen {
return minorVersion > thirteen
}
buildVersion, _ := strconv.Atoi(res[0][3])
return buildVersion >= two
}
return false
}