wings/system/strings.go

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package system
import (
"math/rand"
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"regexp"
"strings"
)
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var ipTrimRegex = regexp.MustCompile(`(:\d*)?$`)
const characters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
// RandomString generates a random string of alpha-numeric characters using a
// pseudo-random number generator. The output of this function IS NOT cryptographically
// secure, it is used solely for generating random strings outside a security context.
func RandomString(n int) string {
var b strings.Builder
b.Grow(n)
for i := 0; i < n; i++ {
b.WriteByte(characters[rand.Intn(len(characters))])
}
return b.String()
}
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// TrimIPSuffix removes the internal port value from an IP address to ensure we're only
// ever working directly with the IP address.
func TrimIPSuffix(s string) string {
return ipTrimRegex.ReplaceAllString(s, "")
}