62 lines
1.5 KiB
Go
62 lines
1.5 KiB
Go
package ids
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import (
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"crypto/rand"
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"crypto/sha256"
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"encoding/binary"
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"strings"
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)
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const (
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alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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randomLength = 11
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)
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type Prefix string
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const (
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Project Prefix = "prj"
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Task Prefix = "tsk"
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Session Prefix = "ses"
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Snapshot Prefix = "snp"
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Review Prefix = "rev"
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InboxItem Prefix = "inb"
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InboxResponse Prefix = "rsp"
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Blob Prefix = "blb"
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LeadNote Prefix = "not"
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WorkflowDefinition Prefix = "wfd"
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WorkflowRun Prefix = "run"
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Send Prefix = "snd"
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Client Prefix = "cli"
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ClientRequest Prefix = "req"
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Transfer Prefix = "xfr"
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Terminal Prefix = "trm"
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SavedCommand Prefix = "cmd"
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Schedule Prefix = "sch"
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)
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func New(prefix Prefix) string {
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out := make([]byte, randomLength)
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buf := make([]byte, 1)
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for i := 0; i < len(out); {
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rand.Read(buf)
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if int(buf[0]) >= 256/len(alphabet)*len(alphabet) {
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continue
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}
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out[i] = alphabet[int(buf[0])%len(alphabet)]
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i++
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}
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return string(prefix) + string(out)
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}
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func Derive(prefix Prefix, parts ...string) string {
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sum := sha256.Sum256([]byte(strings.Join(parts, "\x00")))
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n := binary.BigEndian.Uint64(sum[:8])
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out := make([]byte, randomLength)
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for i := range out {
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out[i] = alphabet[n%uint64(len(alphabet))]
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n /= uint64(len(alphabet))
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}
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return string(prefix) + string(out)
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}
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