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package utils
import (
"crypto/rand"
"encoding/hex"
"fmt"
"regexp"
)
var (
kongVersionRegex = regexp.MustCompile(`^\d+\.\d+`)
)
// Empty checks if a string referenced by s or s itself is empty.
func Empty(s *string) bool {
return s == nil || *s == ""
}
// UUID will generate a random v14 unique identifier based upon random numbers
func UUID() string {
version := byte(4)
uuid := make([]byte, 16)
_, err := rand.Read(uuid)
if err != nil {
panic("failed to read from random generator: " + err.Error())
}
// Set version
uuid[6] = (uuid[6] & 0x0f) | (version << 4)
// Set variant
uuid[8] = (uuid[8] & 0xbf) | 0x80
buf := make([]byte, 36)
var dash byte = '-'
hex.Encode(buf[0:8], uuid[0:4])
buf[8] = dash
hex.Encode(buf[9:13], uuid[4:6])
buf[13] = dash
hex.Encode(buf[14:18], uuid[6:8])
buf[18] = dash
hex.Encode(buf[19:23], uuid[8:10])
buf[23] = dash
hex.Encode(buf[24:], uuid[10:])
return string(buf)
}
// CleanKongVersion takes a version of Kong and returns back a string in
// the form of `/major.minor` version. There are various dashes and dots
// and other descriptors in Kong version strings, which has often created
// confusion in code and incorrect parsing, and hence this function does
// not return the patch version (on which shouldn't rely on anyways).
func CleanKongVersion(version string) (string, error) {
matches := kongVersionRegex.FindStringSubmatch(version)
if len(matches) < 1 {
return "", fmt.Errorf("unknown Kong version")
}
return matches[0], nil
}
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