87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
package events
|
|
|
|
import (
|
|
"crypto/sha256"
|
|
"encoding/hex"
|
|
"strconv"
|
|
)
|
|
|
|
// GetID computes and returns the event ID as a lowercase, hex-encoded SHA-256 hash
|
|
// of the serialized event.
|
|
func GetID(e Event) string {
|
|
hash := GetIDBytes(e)
|
|
return hex.EncodeToString(hash[:])
|
|
}
|
|
|
|
// GetIDBytes computes and returns the event ID as a raw SHA256 digest
|
|
func GetIDBytes(e Event) [32]byte {
|
|
return sha256.Sum256(Serialize(e))
|
|
}
|
|
|
|
// Serialize returns the canonical JSON array representation of the event.
|
|
// used for ID computation: [0, pubkey, created_at, kind, tags, content].
|
|
func Serialize(e Event) []byte {
|
|
buf := make([]byte, 0, 100+len(e.Content)+len(e.Tags)*80)
|
|
return appendSerialized(buf, e)
|
|
}
|
|
|
|
func appendSerialized(dst []byte, e Event) []byte {
|
|
dst = append(dst, "[0,\""...)
|
|
dst = append(dst, e.PubKey...)
|
|
dst = append(dst, "\","...)
|
|
dst = strconv.AppendInt(dst, int64(e.CreatedAt), 10)
|
|
dst = append(dst, ',')
|
|
dst = strconv.AppendInt(dst, int64(e.Kind), 10)
|
|
dst = append(dst, ",["...)
|
|
for i, tag := range e.Tags {
|
|
if i > 0 {
|
|
dst = append(dst, ',')
|
|
}
|
|
dst = append(dst, '[')
|
|
for j, s := range tag {
|
|
if j > 0 {
|
|
dst = append(dst, ',')
|
|
}
|
|
dst = appendEscapedString(dst, s)
|
|
}
|
|
dst = append(dst, ']')
|
|
}
|
|
dst = append(dst, "],"...)
|
|
dst = appendEscapedString(dst, e.Content)
|
|
return append(dst, ']')
|
|
}
|
|
|
|
func appendEscapedString(dst []byte, s string) []byte {
|
|
dst = append(dst, '"')
|
|
for i := 0; i < len(s); i++ {
|
|
c := s[i]
|
|
switch {
|
|
case c == '"':
|
|
dst = append(dst, '\\', '"')
|
|
case c == '\\':
|
|
dst = append(dst, '\\', '\\')
|
|
case c >= 0x20:
|
|
dst = append(dst, c)
|
|
case c == 0x08:
|
|
dst = append(dst, '\\', 'b')
|
|
case c == 0x09:
|
|
dst = append(dst, '\\', 't')
|
|
case c == 0x0a:
|
|
dst = append(dst, '\\', 'n')
|
|
case c == 0x0c:
|
|
dst = append(dst, '\\', 'f')
|
|
case c == 0x0d:
|
|
dst = append(dst, '\\', 'r')
|
|
case c < 0x09:
|
|
dst = append(dst, '\\', 'u', '0', '0', '0', '0'+c)
|
|
case c < 0x10:
|
|
dst = append(dst, '\\', 'u', '0', '0', '0', 0x57+c)
|
|
case c < 0x1a:
|
|
dst = append(dst, '\\', 'u', '0', '0', '1', 0x20+c)
|
|
case c < 0x20:
|
|
dst = append(dst, '\\', 'u', '0', '0', '1', 0x47+c)
|
|
}
|
|
}
|
|
return append(dst, '"')
|
|
}
|