53 lines
866 B
Go
53 lines
866 B
Go
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package build
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import (
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"crypto/rand"
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"crypto/sha1"
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"encoding"
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"encoding/hex"
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"fmt"
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"path/filepath"
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)
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type ID [sha1.Size]byte
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var (
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_ = encoding.TextMarshaler(ID{})
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_ = encoding.TextUnmarshaler(&ID{})
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)
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func (id ID) String() string {
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return hex.EncodeToString(id[:])
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}
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func (id ID) Path() string {
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return filepath.Join(hex.EncodeToString(id[:1]), hex.EncodeToString(id[:]))
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}
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func (id ID) MarshalText() ([]byte, error) {
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return []byte(hex.EncodeToString(id[:])), nil
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}
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func (id *ID) UnmarshalText(b []byte) error {
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raw, err := hex.DecodeString(string(b))
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if err != nil {
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return err
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}
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if len(raw) != len(id) {
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return fmt.Errorf("invalid id size: %q", b)
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}
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copy(id[:], raw)
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return nil
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}
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func NewID() ID {
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var id ID
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_, err := rand.Read(id[:])
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if err != nil {
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panic(fmt.Sprintf("crypto/rand is unavailable: %v", err))
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}
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return id
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}
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