363 lines
10 KiB
TypeScript
363 lines
10 KiB
TypeScript
// Copyright 2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import Long from 'long';
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import { ReceiptCredentialPresentation } from '@signalapp/libsignal-client/zkgroup';
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import { isNumber } from 'lodash';
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import { assertDev, strictAssert } from '../util/assert';
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import { dropNull, shallowDropNull } from '../util/dropNull';
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import { SignalService as Proto } from '../protobuf';
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import { deriveGroupFields } from '../groups';
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import * as Bytes from '../Bytes';
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import type {
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ProcessedAttachment,
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ProcessedDataMessage,
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ProcessedGroupV2Context,
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ProcessedQuote,
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ProcessedContact,
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ProcessedPreview,
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ProcessedSticker,
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ProcessedReaction,
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ProcessedDelete,
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ProcessedGiftBadge,
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} from './Types.d';
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import { GiftBadgeStates } from '../components/conversation/Message';
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import { APPLICATION_OCTET_STREAM, stringToMIMEType } from '../types/MIME';
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import { SECOND, DurationInSeconds } from '../util/durations';
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import type { AnyPaymentEvent } from '../types/Payment';
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import { PaymentEventKind } from '../types/Payment';
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import { filterAndClean } from '../types/BodyRange';
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const FLAGS = Proto.DataMessage.Flags;
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export const ATTACHMENT_MAX = 32;
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export function processAttachment(
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attachment: Proto.IAttachmentPointer
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): ProcessedAttachment;
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export function processAttachment(
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attachment?: Proto.IAttachmentPointer | null
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): ProcessedAttachment | undefined;
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export function processAttachment(
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attachment?: Proto.IAttachmentPointer | null
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): ProcessedAttachment | undefined {
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if (!attachment) {
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return undefined;
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}
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const { cdnId } = attachment;
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const hasCdnId = Long.isLong(cdnId) ? !cdnId.isZero() : Boolean(cdnId);
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const { contentType, digest, key, size } = attachment;
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if (!isNumber(size)) {
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throw new Error('Missing size on incoming attachment!');
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}
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return {
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...shallowDropNull(attachment),
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cdnId: hasCdnId ? String(cdnId) : undefined,
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contentType: contentType
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? stringToMIMEType(contentType)
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: APPLICATION_OCTET_STREAM,
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digest: digest ? Bytes.toBase64(digest) : undefined,
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key: key ? Bytes.toBase64(key) : undefined,
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size,
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};
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}
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export function processGroupV2Context(
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groupV2?: Proto.IGroupContextV2 | null
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): ProcessedGroupV2Context | undefined {
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if (!groupV2) {
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return undefined;
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}
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strictAssert(groupV2.masterKey, 'groupV2 context without masterKey');
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const data = deriveGroupFields(groupV2.masterKey);
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return {
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masterKey: Bytes.toBase64(groupV2.masterKey),
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revision: dropNull(groupV2.revision),
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groupChange: groupV2.groupChange
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? Bytes.toBase64(groupV2.groupChange)
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: undefined,
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id: Bytes.toBase64(data.id),
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secretParams: Bytes.toBase64(data.secretParams),
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publicParams: Bytes.toBase64(data.publicParams),
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};
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}
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export function processPayment(
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payment?: Proto.DataMessage.IPayment | null
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): AnyPaymentEvent | undefined {
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if (!payment) {
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return undefined;
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}
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if (payment.notification != null) {
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return {
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kind: PaymentEventKind.Notification,
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note: payment.notification.note ?? null,
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};
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}
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if (payment.activation != null) {
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if (
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payment.activation.type ===
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Proto.DataMessage.Payment.Activation.Type.REQUEST
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) {
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return { kind: PaymentEventKind.ActivationRequest };
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}
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if (
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payment.activation.type ===
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Proto.DataMessage.Payment.Activation.Type.ACTIVATED
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) {
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return { kind: PaymentEventKind.Activation };
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}
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}
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return undefined;
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}
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export function processQuote(
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quote?: Proto.DataMessage.IQuote | null
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): ProcessedQuote | undefined {
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if (!quote) {
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return undefined;
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}
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return {
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id: quote.id?.toNumber(),
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authorUuid: dropNull(quote.authorUuid),
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text: dropNull(quote.text),
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attachments: (quote.attachments ?? []).map(attachment => {
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return {
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contentType: dropNull(attachment.contentType),
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fileName: dropNull(attachment.fileName),
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thumbnail: processAttachment(attachment.thumbnail),
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};
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}),
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bodyRanges: filterAndClean(quote.bodyRanges),
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type: quote.type || Proto.DataMessage.Quote.Type.NORMAL,
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};
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}
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export function processContact(
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contact?: ReadonlyArray<Proto.DataMessage.IContact> | null
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): ReadonlyArray<ProcessedContact> | undefined {
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if (!contact) {
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return undefined;
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}
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return contact.map(item => {
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return {
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...item,
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avatar: item.avatar
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? {
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avatar: processAttachment(item.avatar.avatar),
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isProfile: Boolean(item.avatar.isProfile),
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}
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: undefined,
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};
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});
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}
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function isLinkPreviewDateValid(value: unknown): value is number {
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return (
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typeof value === 'number' &&
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!Number.isNaN(value) &&
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Number.isFinite(value) &&
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value > 0
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);
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}
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function cleanLinkPreviewDate(value?: Long | null): number | undefined {
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const result = value?.toNumber();
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return isLinkPreviewDateValid(result) ? result : undefined;
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}
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export function processPreview(
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preview?: ReadonlyArray<Proto.DataMessage.IPreview> | null
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): ReadonlyArray<ProcessedPreview> | undefined {
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if (!preview) {
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return undefined;
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}
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return preview.map(item => {
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return {
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url: dropNull(item.url),
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title: dropNull(item.title),
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image: item.image ? processAttachment(item.image) : undefined,
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description: dropNull(item.description),
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date: cleanLinkPreviewDate(item.date),
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};
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});
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}
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export function processSticker(
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sticker?: Proto.DataMessage.ISticker | null
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): ProcessedSticker | undefined {
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if (!sticker) {
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return undefined;
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}
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return {
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packId: sticker.packId ? Bytes.toHex(sticker.packId) : undefined,
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packKey: sticker.packKey ? Bytes.toBase64(sticker.packKey) : undefined,
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stickerId: dropNull(sticker.stickerId),
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emoji: dropNull(sticker.emoji),
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data: processAttachment(sticker.data),
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};
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}
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export function processReaction(
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reaction?: Proto.DataMessage.IReaction | null
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): ProcessedReaction | undefined {
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if (!reaction) {
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return undefined;
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}
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return {
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emoji: dropNull(reaction.emoji),
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remove: Boolean(reaction.remove),
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targetAuthorUuid: dropNull(reaction.targetAuthorUuid),
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targetTimestamp: reaction.targetTimestamp?.toNumber(),
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};
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}
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export function processDelete(
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del?: Proto.DataMessage.IDelete | null
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): ProcessedDelete | undefined {
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if (!del) {
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return undefined;
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}
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return {
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targetSentTimestamp: del.targetSentTimestamp?.toNumber(),
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};
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}
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export function processGiftBadge(
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giftBadge: Proto.DataMessage.IGiftBadge | null | undefined
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): ProcessedGiftBadge | undefined {
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if (
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!giftBadge ||
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!giftBadge.receiptCredentialPresentation ||
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giftBadge.receiptCredentialPresentation.length === 0
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) {
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return undefined;
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}
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const receipt = new ReceiptCredentialPresentation(
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Buffer.from(giftBadge.receiptCredentialPresentation)
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);
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return {
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expiration: Number(receipt.getReceiptExpirationTime()) * SECOND,
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id: undefined,
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level: Number(receipt.getReceiptLevel()),
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receiptCredentialPresentation: Bytes.toBase64(
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giftBadge.receiptCredentialPresentation
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),
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state: GiftBadgeStates.Unopened,
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};
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}
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export function processDataMessage(
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message: Proto.IDataMessage,
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envelopeTimestamp: number
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): ProcessedDataMessage {
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/* eslint-disable no-bitwise */
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// Now that its decrypted, validate the message and clean it up for consumer
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// processing
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// Note that messages may (generally) only perform one action and we ignore remaining
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// fields after the first action.
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if (!message.timestamp) {
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throw new Error('Missing timestamp on dataMessage');
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}
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const timestamp = message.timestamp?.toNumber();
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if (envelopeTimestamp !== timestamp) {
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throw new Error(
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`Timestamp ${timestamp} in DataMessage did not ` +
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`match envelope timestamp ${envelopeTimestamp}`
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);
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}
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const result: ProcessedDataMessage = {
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body: dropNull(message.body),
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attachments: (message.attachments ?? []).map(
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(attachment: Proto.IAttachmentPointer) => processAttachment(attachment)
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),
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groupV2: processGroupV2Context(message.groupV2),
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flags: message.flags ?? 0,
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expireTimer: DurationInSeconds.fromSeconds(message.expireTimer ?? 0),
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profileKey:
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message.profileKey && message.profileKey.length > 0
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? Bytes.toBase64(message.profileKey)
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: undefined,
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timestamp,
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payment: processPayment(message.payment),
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quote: processQuote(message.quote),
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contact: processContact(message.contact),
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preview: processPreview(message.preview),
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sticker: processSticker(message.sticker),
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requiredProtocolVersion: dropNull(message.requiredProtocolVersion),
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isViewOnce: Boolean(message.isViewOnce),
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reaction: processReaction(message.reaction),
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delete: processDelete(message.delete),
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bodyRanges: filterAndClean(message.bodyRanges),
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groupCallUpdate: dropNull(message.groupCallUpdate),
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storyContext: dropNull(message.storyContext),
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giftBadge: processGiftBadge(message.giftBadge),
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};
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const isEndSession = Boolean(result.flags & FLAGS.END_SESSION);
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const isExpirationTimerUpdate = Boolean(
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result.flags & FLAGS.EXPIRATION_TIMER_UPDATE
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);
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const isProfileKeyUpdate = Boolean(result.flags & FLAGS.PROFILE_KEY_UPDATE);
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// The following assertion codifies an assumption: 0 or 1 flags are set, but never
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// more. This assumption is fine as of this writing, but may not always be.
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const flagCount = [
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isEndSession,
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isExpirationTimerUpdate,
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isProfileKeyUpdate,
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].filter(Boolean).length;
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assertDev(
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flagCount <= 1,
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`Expected exactly <=1 flags to be set, but got ${flagCount}`
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);
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if (isEndSession) {
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result.body = undefined;
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result.attachments = [];
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return result;
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}
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if (isExpirationTimerUpdate) {
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result.body = undefined;
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result.attachments = [];
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} else if (isProfileKeyUpdate) {
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result.body = undefined;
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result.attachments = [];
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} else if (result.flags !== 0) {
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throw new Error(`Unknown flags in message: ${result.flags}`);
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}
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const attachmentCount = result.attachments.length;
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if (attachmentCount > ATTACHMENT_MAX) {
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throw new Error(
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`Too many attachments: ${attachmentCount} included in one message, ` +
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`max is ${ATTACHMENT_MAX}`
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);
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}
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return result;
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}
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