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59 lines
1.0 KiB
59 lines
1.0 KiB
package generate
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import (
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"crypto/rand"
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"encoding/binary"
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mrand "math/rand"
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"strconv"
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"strings"
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)
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// ID generates an ID using crypto-random, falling back to math random when that fails
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// to avoid disrupting operation because of a faulty RNG.
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func ID(prefix string, length int) string {
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var data [32]byte
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result := strings.Builder{}
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result.Grow(length + 32)
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result.WriteString(prefix)
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pos := 0
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for result.Len() < length {
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if pos == 0 {
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randRead(data[:])
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}
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result.WriteString(strconv.FormatUint(binary.BigEndian.Uint64(data[pos:pos+8]), 36))
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pos = (pos + 8) % 32
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}
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return result.String()[:length]
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}
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func randRead(data []byte) {
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n, err := rand.Read(data)
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if err != nil {
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mrand.Read(data[n:])
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}
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}
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// PostID generates a post ID.
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func PostID() string {
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return ID("P", 16)
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}
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// StoryID generates a post ID.
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func StoryID() string {
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return ID("S", 16)
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}
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// ChapterID generates a post ID.
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func ChapterID() string {
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return ID("SC", 24)
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}
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// FileID generates a file ID.
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func FileID() string {
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return ID("F", 16)
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}
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