forked from TrueCloudLab/lego
73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
package internal
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import (
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"crypto/sha1"
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"fmt"
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"io"
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"time"
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)
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func authToken(userName string, wapiPass string) string {
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return sha1string(userName + sha1string(wapiPass) + czechHourString())
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}
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func sha1string(txt string) string {
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h := sha1.New()
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_, _ = io.WriteString(h, txt)
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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func czechHourString() string {
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return formatHour(czechHour())
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}
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func czechHour() int {
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tryZones := []string{"Europe/Prague", "Europe/Paris", "CET"}
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for _, zoneName := range tryZones {
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loc, err := time.LoadLocation(zoneName)
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if err == nil {
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return time.Now().In(loc).Hour()
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}
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}
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// hopefully this will never be used
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// this is fallback for containers without tzdata installed
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return utcToCet(time.Now().UTC()).Hour()
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}
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func utcToCet(utc time.Time) time.Time {
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// https://en.wikipedia.org/wiki/Central_European_Time
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// As of 2011, all member states of the European Union observe summer time (daylight saving time),
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// from the last Sunday in March to the last Sunday in October.
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// States within the CET area switch to Central European Summer Time (CEST -- UTC+02:00) for the summer.[1]
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utcMonth := utc.Month()
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if utcMonth < time.March || utcMonth > time.October {
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return utc.Add(time.Hour)
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}
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if utcMonth > time.March && utcMonth < time.October {
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return utc.Add(time.Hour * 2)
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}
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dayOff := 0
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breaking := time.Date(utc.Year(), utcMonth+1, dayOff, 1, 0, 0, 0, time.UTC)
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for {
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if breaking.Weekday() == time.Sunday {
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break
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}
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dayOff--
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breaking = time.Date(utc.Year(), utcMonth+1, dayOff, 1, 0, 0, 0, time.UTC)
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if dayOff < -7 {
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panic("safety exit to avoid infinite loop")
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}
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}
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if (utcMonth == time.March && utc.Before(breaking)) || (utcMonth == time.October && utc.After(breaking)) {
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return utc.Add(time.Hour)
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}
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return utc.Add(time.Hour * 2)
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}
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func formatHour(hour int) string {
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return fmt.Sprintf("%02d", hour)
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}
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