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diff --git a/lib/shared/thread-utils.js b/lib/shared/thread-utils.js
--- a/lib/shared/thread-utils.js
+++ b/lib/shared/thread-utils.js
@@ -60,6 +60,7 @@
threadTypes,
threadPermissions,
threadTypeIsCommunityRoot,
+ assertThreadType,
} from '../types/thread-types';
import { type ClientUpdateInfo, updateTypes } from '../types/update-types';
import type {
@@ -272,6 +273,34 @@
const locallyUniqueThreadIDRegex =
'pending/(type[0-9]+/[0-9]+(\\+[0-9]+)*|sidebar/[0-9]+)';
+type LocallyUniqueThreadIDContents = {
+ +threadType: ThreadType,
+ +memberIDs: $ReadOnlyArray<string>,
+ +sourceMessageID: ?string,
+};
+
+function parseLocallyUniqueThreadID(
+ pendingThreadID: string,
+): ?LocallyUniqueThreadIDContents {
+ const locallyUniqueRegex = new RegExp(`^${locallyUniqueThreadIDRegex}$`);
+ const pendingThreadIDMatches = locallyUniqueRegex.exec(pendingThreadID);
+ if (!pendingThreadIDMatches) {
+ return null;
+ }
+ const [threadTypeString, threadKey] = pendingThreadIDMatches[1].split('/');
+ const threadType =
+ threadTypeString === 'sidebar'
+ ? threadTypes.SIDEBAR
+ : assertThreadType(Number(threadTypeString.replace('type', '')));
+ const memberIDs = threadTypeString === 'sidebar' ? [] : threadKey.split('+');
+ const sourceMessageID = threadTypeString === 'sidebar' ? threadKey : null;
+ return {
+ threadType,
+ memberIDs,
+ sourceMessageID,
+ };
+}
+
type CreatePendingThreadArgs = {
+viewerID: string,
+threadType: ThreadType,
@@ -1385,6 +1414,7 @@
getSingleOtherUser,
getLocallyUniqueThreadID,
locallyUniqueThreadIDRegex,
+ parseLocallyUniqueThreadID,
createPendingThread,
createPendingThreadItem,
createPendingSidebar,
diff --git a/lib/shared/thread-utils.test.js b/lib/shared/thread-utils.test.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/thread-utils.test.js
@@ -0,0 +1,60 @@
+// @flow
+
+import { threadTypes } from '../types/thread-types';
+import { parseLocallyUniqueThreadID } from './thread-utils';
+
+describe('parseLocallyUniqueThreadID(pendingThreadID: string)', () => {
+ it('should return correct data for real pending sidebar ID', () => {
+ const sidebarResult = {
+ threadType: threadTypes.SIDEBAR,
+ memberIDs: [],
+ sourceMessageID: '12345',
+ };
+ expect(parseLocallyUniqueThreadID('pending/sidebar/12345')).toStrictEqual(
+ sidebarResult,
+ );
+ });
+
+ it('should return correct data for real pending sidebar ID', () => {
+ const pendingPersonalResult = {
+ threadType: threadTypes.PERSONAL,
+ memberIDs: ['83810', '86622'],
+ sourceMessageID: null,
+ };
+ expect(
+ parseLocallyUniqueThreadID('pending/type6/83810+86622'),
+ ).toStrictEqual(pendingPersonalResult);
+
+ const pendingCommunityOpenResult = {
+ threadType: threadTypes.COMMUNITY_OPEN_SUBTHREAD,
+ memberIDs: ['83810', '86622', '83889'],
+ sourceMessageID: null,
+ };
+ expect(
+ parseLocallyUniqueThreadID('pending/type3/83810+86622+83889'),
+ ).toStrictEqual(pendingCommunityOpenResult);
+ });
+
+ it('should return null when there are missing information in ID', () => {
+ expect(parseLocallyUniqueThreadID('pending/type4/')).toBeNull();
+ expect(parseLocallyUniqueThreadID('type12/83810+86622')).toBeNull();
+ expect(parseLocallyUniqueThreadID('pending/83810')).toBeNull();
+ expect(parseLocallyUniqueThreadID('pending')).toBeNull();
+ expect(parseLocallyUniqueThreadID('')).toBeNull();
+ expect(parseLocallyUniqueThreadID('pending/something/12345')).toBeNull();
+ });
+
+ it('should return null when the format is invalid', () => {
+ expect(parseLocallyUniqueThreadID('someothertext/type1/12345')).toBeNull();
+ expect(
+ parseLocallyUniqueThreadID('pending/type6/12312+++11+12'),
+ ).toBeNull();
+ expect(parseLocallyUniqueThreadID('pending/type3/83810+')).toBeNull();
+ });
+
+ it('should throw invariant violation when thread type is invalid ', () => {
+ expect(() =>
+ parseLocallyUniqueThreadID('pending/type123/12345'),
+ ).toThrowError('number is not ThreadType enum');
+ });
+});

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