status-go/protocol/emoji_reaction.go

package protocol

import (
	"crypto/ecdsa"
	"encoding/json"
	"fmt"

	"github.com/golang/protobuf/proto"

	"github.com/status-im/status-go/eth-node/crypto"
	"github.com/status-im/status-go/eth-node/types"
	"github.com/status-im/status-go/protocol/protobuf"
)

// EmojiReaction represents an emoji reaction from a user in the application layer, used for persistence, querying and
// signaling
type EmojiReaction struct {
	protobuf.EmojiReaction

	// From is a public key of the author of the emoji reaction.
	From string `json:"from,omitempty"`

	// SigPubKey is the ecdsa encoded public key of the emoji reaction author
	SigPubKey *ecdsa.PublicKey `json:"-"`
}

// ID is the Keccak256() contatenation of From-ChatID-MessageID-EmojiType
func (e EmojiReaction) ID() string {
	return types.EncodeHex(crypto.Keccak256([]byte(fmt.Sprintf("%s%s%s%d", e.From, e.ChatId, e.MessageId, e.Type))))
}

// GetSigPubKey returns an ecdsa encoded public key
// this function is required to implement the ChatEntity interface
func (e EmojiReaction) GetSigPubKey() *ecdsa.PublicKey {
	return e.SigPubKey
}

// GetProtoBuf returns the struct's embedded protobuf struct
// this function is required to implement the ChatEntity interface
func (e EmojiReaction) GetProtobuf() proto.Message {
	return &e.EmojiReaction
}

// SetMessageType a setter for the MessageType field
// this function is required to implement the ChatEntity interface
func (e *EmojiReaction) SetMessageType(messageType protobuf.MessageType) {
	e.MessageType = messageType
}

func (e *EmojiReaction) MarshalJSON() ([]byte, error) {
	type EmojiAlias EmojiReaction
	item := struct {
		*EmojiAlias
		ID string `json:"id"`
	}{
		EmojiAlias: (*EmojiAlias)(e),
		ID:         e.ID(),
	}

	return json.Marshal(item)
}