80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
package nostr
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import (
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"crypto/sha256"
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"encoding/hex"
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"strconv"
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"github.com/mailru/easyjson"
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)
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// Event represents a Nostr event.
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type Event struct {
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ID ID
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PubKey PubKey
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CreatedAt Timestamp
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Kind Kind
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Tags Tags
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Content string
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Sig [64]byte
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}
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func (evt Event) String() string {
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j, _ := easyjson.Marshal(evt)
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return string(j)
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}
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// GetID serializes and returns the event ID as a string.
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func (evt Event) GetID() ID {
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return sha256.Sum256(evt.Serialize())
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}
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// CheckID checks if the implied ID matches the given ID more efficiently.
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func (evt Event) CheckID() bool {
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return evt.GetID() == evt.ID
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}
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// Serialize outputs a byte array that can be hashed to produce the canonical event "id".
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func (evt Event) Serialize() []byte {
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// the serialization process is just putting everything into a JSON array
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// so the order is kept. See NIP-01
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dst := make([]byte, 0, 100+len(evt.Content)+len(evt.Tags)*80)
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return serializeEventInto(evt, dst)
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}
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func serializeEventInto(evt Event, dst []byte) []byte {
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// the header portion is easy to serialize
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// [0,"pubkey",created_at,kind,[
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dst = append(dst, `[0,"`...)
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dst = hex.AppendEncode(dst, evt.PubKey[:])
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dst = append(dst, `",`...)
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dst = append(dst, strconv.FormatInt(int64(evt.CreatedAt), 10)...)
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dst = append(dst, `,`...)
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dst = append(dst, strconv.FormatUint(uint64(evt.Kind), 10)...)
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dst = append(dst, `,`...)
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// tags
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dst = append(dst, '[')
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for i, tag := range evt.Tags {
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if i > 0 {
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dst = append(dst, ',')
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}
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// tag item
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dst = append(dst, '[')
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for i, s := range tag {
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if i > 0 {
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dst = append(dst, ',')
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}
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dst = escapeString(dst, s)
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}
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dst = append(dst, ']')
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}
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dst = append(dst, "],"...)
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// content needs to be escaped in general as it is user generated.
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dst = escapeString(dst, evt.Content)
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dst = append(dst, ']')
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return dst
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}
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