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helpers.go
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/
helpers.go
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package sfsapp
import (
"math/rand"
"path"
"strings"
)
const cStringLength = 16
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
const (
letterIdxBits = 6 // 6 bits to represent a letter index
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
)
// GenerateId -
func GenerateId() string {
b := make([]byte, cStringLength)
for i := 0; i < cStringLength; {
if idx := int(rand.Int63() & letterIdxMask); idx < len(letterBytes) {
b[i] = letterBytes[idx]
i++
}
}
return string(b)
}
// ShiftPath splits off the first component of p, which will be cleaned of
// relative components before processing. head will never contain a slash and
// tail will always be a rooted path without trailing slash.
func ShiftPath(p string) (head, tail string) {
p = path.Clean("/" + p)
i := strings.Index(p[1:], "/") + 1
if i <= 0 {
return p[1:], "/"
}
return p[1:i], p[i:]
}