ae9a71034d
Add HTTP /v1 MVC, TCP send path, groups with server-side member-avatar collage, object-storage upload, and friends/favorites around the architecture-v3 layout. Co-authored-by: Cursor <cursoragent@cursor.com>
49 lines
821 B
Go
49 lines
821 B
Go
package entity
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import (
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"regexp"
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"strings"
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)
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const (
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SparkIDMin = 6
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SparkIDMax = 32
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)
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var sparkIDRe = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9_]{5,31}$`)
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func ValidSparkID(id string) bool {
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n := len(id)
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return n >= SparkIDMin && n <= SparkIDMax && sparkIDRe.MatchString(id)
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}
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// DefaultSparkID is a unique, letter-prefixed handle derived from the Snowflake id.
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func DefaultSparkID(userID int64) string {
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s := "s" + strings.ToLower(strconv36(userID))
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for len(s) < SparkIDMin {
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s += "0"
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}
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if len(s) > SparkIDMax {
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s = s[:SparkIDMax]
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}
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return s
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}
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func strconv36(n int64) string {
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if n < 0 {
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n = -n
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}
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const digits = "0123456789abcdefghijklmnopqrstuvwxyz"
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if n == 0 {
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return "0"
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}
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var buf [16]byte
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i := len(buf)
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for n > 0 {
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i--
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buf[i] = digits[n%36]
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n /= 36
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}
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return string(buf[i:])
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}
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