qortal-ui/crypto/api/transactions/chat/ChatTransaction.js

import ChatBase from './ChatBase'
import nacl from '../../deps/nacl-fast'
import ed2curve from '../../deps/ed2curve'
import { Sha256 } from 'asmcrypto.js'
import { CHAT_REFERENCE_FEATURE_TRIGGER_TIMESTAMP } from '../../constants'

export default class ChatTransaction extends ChatBase {
	constructor() {
		super()
		this.type = 18
		this.fee = 0
	}

	set recipientPublicKey(recipientPublicKey) {
		this._base58RecipientPublicKey = recipientPublicKey instanceof Uint8Array ? this.constructor.Base58.encode(recipientPublicKey) : recipientPublicKey
		this._recipientPublicKey = this.constructor.Base58.decode(this._base58RecipientPublicKey)
	}

	set proofOfWorkNonce(proofOfWorkNonce) {
		this._proofOfWorkNonce = this.constructor.utils.int32ToBytes(proofOfWorkNonce)
	}

	set recipient(recipient) {
		this._recipient = recipient instanceof Uint8Array ? recipient : this.constructor.Base58.decode(recipient)
		this._hasReceipient = new Uint8Array(1)
		this._hasReceipient[0] = 1
	}

	set hasChatReference(hasChatReference) {
		this._hasChatReference = new Uint8Array(1)
		this._hasChatReference[0] = hasChatReference
	}

	set chatReference(chatReference) {
		this._chatReference = chatReference instanceof Uint8Array ? chatReference : this.constructor.Base58.decode(chatReference)
	}

	set message(message) {
		this.messageText = message;
		this._message = this.constructor.utils.stringtoUTF8Array(message)
		this._messageLength = this.constructor.utils.int32ToBytes(this._message.length)
	}

	set isEncrypted(isEncrypted) {
		this._isEncrypted = new Uint8Array(1)
		this._isEncrypted[0] = isEncrypted

		if (isEncrypted === 1) {
			const convertedPrivateKey = ed2curve.convertSecretKey(this._keyPair.privateKey)
			const convertedPublicKey = ed2curve.convertPublicKey(this._recipientPublicKey)
			const sharedSecret = new Uint8Array(32)
			nacl.lowlevel.crypto_scalarmult(sharedSecret, convertedPrivateKey, convertedPublicKey)

			this._chatEncryptionSeed = new Sha256().process(sharedSecret).finish().result
			this._encryptedMessage = nacl.secretbox(this._message, this._lastReference.slice(0, 24), this._chatEncryptionSeed)
		}

		this._myMessage = isEncrypted === 1 ? this._encryptedMessage : this._message
		this._myMessageLenth = isEncrypted === 1 ? this.constructor.utils.int32ToBytes(this._myMessage.length) : this._messageLength
	}

	set isText(isText) {
		this._isText = new Uint8Array(1)
		this._isText[0] = isText
	}

	get params() {
		const params = super.params
		params.push(
			this._proofOfWorkNonce,
			this._hasReceipient,
			this._recipient,
			this._myMessageLenth,
			this._myMessage,
			this._isEncrypted,
			this._isText,
			this._feeBytes
		)

		// After the feature trigger timestamp we need to include chat reference
		if (new Date(this._timestamp).getTime() >= CHAT_REFERENCE_FEATURE_TRIGGER_TIMESTAMP) {
			params.push(this._hasChatReference)

			if (this._hasChatReference[0] == 1) {
				params.push(this._chatReference)
			}
		}
		return params
	}
}