74 lines
1.4 KiB
Go
74 lines
1.4 KiB
Go
package rnd
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import (
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"strconv"
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"time"
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)
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// PPID returns a unique id with prefix as string.
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func PPID(prefix byte) string {
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result := make([]byte, 0, 16)
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result = append(result, prefix)
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result = append(result, strconv.FormatInt(time.Now().UTC().Unix(), 36)[0:6]...)
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result = append(result, Token(9)...)
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return string(result)
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}
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// IsPPID returns true if string is a unique id as generated by PhotoPrism.
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func IsPPID(s string, prefix byte) bool {
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if len(s) != 16 {
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return false
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}
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if !IsLowerAlnum(s) {
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return false
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}
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return prefix == 0 || s[0] == prefix
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}
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// IsHex returns true if the string only contains hex numbers, dashes and letters without whitespace.
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func IsHex(s string) bool {
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if s == "" {
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return false
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}
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for _, r := range s {
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if (r < 48 || r > 57) && (r < 97 || r > 102) && (r < 65 || r > 90) && r != 45 {
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return false
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}
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}
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return true
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}
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// IsLowerAlnum returns true if the string only contains alphanumeric ascii chars without whitespace.
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func IsLowerAlnum(s string) bool {
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if s == "" {
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return false
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}
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for _, r := range s {
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if (r < 48 || r > 57) && (r < 97 || r > 122) {
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return false
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}
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}
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return true
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}
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// IsUID returns true if string is a seemingly unique id.
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func IsUID(s string, prefix byte) bool {
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// Regular UUID.
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if len(s) == 36 && IsHex(s) {
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return true
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}
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// Not a known UID format.
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if len(s) != 16 {
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return false
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}
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return IsPPID(s, prefix)
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}
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