83 lines
1.4 KiB
Go
83 lines
1.4 KiB
Go
package clean
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import (
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"strconv"
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"strings"
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)
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// ID sanitizes identifier tokens, for example, a session ID, a UUID, or some other string ID.
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func ID(s string) string {
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if s == "" || len(s) > 4096 {
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return ""
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}
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var prev rune
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// Remove all invalid characters.
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s = strings.Map(func(r rune) rune {
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if r == ' ' && (prev == 0 || prev == ' ') {
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return -1
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}
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prev = r
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switch r {
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case ' ', '"', '-', '+', '/', '=', '#', '$', '@', ':', ';', '_':
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return r
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}
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if (r < '0' || r > '9') && (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') {
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return -1
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}
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return r
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}, s)
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return s
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}
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// UID sanitizes unique identifier strings and returns them in lowercase.
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func UID(s string) string {
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if l := len(s); l < 16 || l > 64 {
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return ""
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}
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s = strings.ToLower(s)
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// Remove all invalid characters.
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s = strings.Map(func(r rune) rune {
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switch r {
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case '-', '_', ':':
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return r
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}
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if (r < '0' || r > '9') && (r < 'a' || r > 'z') {
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return -1
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}
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return r
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}, s)
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return s
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}
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// IdUint converts the string converted to an unsigned integer and 0 if the string is invalid.
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func IdUint(s string) uint {
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// Largest possible values:
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// UInt64: 18446744073709551615 (20 digits)
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// UInt32: 4294967295 (10 digits)
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if s == "" || reject(s, 10) {
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return 0
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}
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s = strings.TrimSpace(s)
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result, err := strconv.ParseUint(s, 10, 32)
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if err != nil {
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return 0
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}
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return uint(result)
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}
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