85 lines
1.7 KiB
Go
85 lines
1.7 KiB
Go
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package nostr
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import (
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"github.com/mailru/easyjson"
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)
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type Event struct {
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ID string
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PubKey string
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CreatedAt Timestamp
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Kind int
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Tags Tags
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Content string
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Sig string
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// anything here will be mashed together with the main event object when serializing
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extra map[string]any
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}
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// Event Stringer interface, just returns the raw JSON as a string.
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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() string {
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h := sha256.Sum256(evt.Serialize())
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return hex.EncodeToString(h[:])
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}
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// CheckID checks if the implied ID matches the given ID
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func (evt *Event) CheckID() bool {
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ser := evt.Serialize()
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h := sha256.Sum256(ser)
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const hextable = "0123456789abcdef"
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for i := 0; i < 32; i++ {
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b := hextable[h[i]>>4]
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if b != evt.ID[i*2] {
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return false
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}
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b = hextable[h[i]&0x0f]
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if b != evt.ID[i*2+1] {
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return false
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}
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}
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return true
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}
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// Serialize outputs a byte array that can be hashed/signed to identify/authenticate.
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// JSON encoding as defined in RFC4627.
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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)
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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, []byte(
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fmt.Sprintf(
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"[0,\"%s\",%d,%d,",
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evt.PubKey,
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evt.CreatedAt,
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evt.Kind,
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))...)
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// tags
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dst = evt.Tags.marshalTo(dst)
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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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