67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
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package utils
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import (
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"crypto/md5" // #nosec
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"encoding/hex"
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"math/rand"
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"os"
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"regexp"
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"time"
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"unsafe"
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)
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const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
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const (
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letterIdxBits = 6 // 6 bits to represent a letter index
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letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
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letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
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)
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func RandStringBytesMaskImprSrcUnsafe(n int) string {
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var src = rand.NewSource(time.Now().UnixNano())
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b := make([]byte, n)
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// A src.Int63() generates 63 random bits, enough for letterIdxMax characters!
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for i, cache, remain := n-1, src.Int63(), letterIdxMax; i >= 0; {
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if remain == 0 {
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cache, remain = src.Int63(), letterIdxMax
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}
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if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
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b[i] = letterBytes[idx]
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i--
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}
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cache >>= letterIdxBits
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remain--
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}
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return *(*string)(unsafe.Pointer(&b)) //#nosec
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}
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func MD5(plantext string) string {
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hash := md5.New() // #nosec
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hash.Write([]byte(plantext))
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return hex.EncodeToString(hash.Sum(nil))
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}
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func IsWindows() bool {
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return os.PathSeparator == '\\' && os.PathListSeparator == ';'
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}
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var ipv4Re = regexp.MustCompile(`(\d*\.).*(\.\d*)`)
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func ipv4Desensitize(ipv4Addr string) string {
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return ipv4Re.ReplaceAllString(ipv4Addr, "$1****$2")
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}
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var ipv6Re = regexp.MustCompile(`(\w*:\w*:).*(:\w*:\w*)`)
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func ipv6Desensitize(ipv6Addr string) string {
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return ipv6Re.ReplaceAllString(ipv6Addr, "$1****$2")
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}
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func IPDesensitize(ipAddr string) string {
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ipAddr = ipv4Desensitize(ipAddr)
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ipAddr = ipv6Desensitize(ipAddr)
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return ipAddr
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}
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