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diff --git a/lib/shared/dm-ops/dm-op-specs.js b/lib/shared/dm-ops/dm-op-specs.js
--- a/lib/shared/dm-ops/dm-op-specs.js
+++ b/lib/shared/dm-ops/dm-op-specs.js
@@ -5,6 +5,7 @@
import { createThreadSpec } from './create-thread-spec.js';
import type { DMOperationSpec } from './dm-op-spec.js';
import { joinThreadSpec } from './join-thread-spec.js';
+import { leaveThreadSpec } from './leave-thread-spec.js';
import { sendEditMessageSpec } from './send-edit-message-spec.js';
import { sendReactionMessageSpec } from './send-reaction-message-spec.js';
import { sendTextMessageSpec } from './send-text-message-spec.js';
@@ -20,4 +21,5 @@
[dmOperationTypes.SEND_EDIT_MESSAGE]: sendEditMessageSpec,
[dmOperationTypes.ADD_MEMBERS]: addMembersSpec,
[dmOperationTypes.JOIN_THREAD]: joinThreadSpec,
+ [dmOperationTypes.LEAVE_THREAD]: leaveThreadSpec,
});
diff --git a/lib/shared/dm-ops/leave-thread-spec.js b/lib/shared/dm-ops/leave-thread-spec.js
new file mode 100644
--- /dev/null
+++ b/lib/shared/dm-ops/leave-thread-spec.js
@@ -0,0 +1,76 @@
+// @flow
+
+import uuid from 'uuid';
+
+import type {
+ DMOperationSpec,
+ ProcessDMOperationUtilities,
+} from './dm-op-spec.js';
+import type { DMLeaveThreadOperation } from '../../types/dm-ops.js';
+import { messageTypes } from '../../types/message-types-enum.js';
+import type { ThickRawThreadInfo } from '../../types/minimally-encoded-thread-permissions-types.js';
+import { updateTypes } from '../../types/update-types-enum.js';
+import type { ClientUpdateInfo } from '../../types/update-types.js';
+import { userIsMember } from '../thread-utils.js';
+
+const leaveThreadSpec: DMOperationSpec<DMLeaveThreadOperation> = Object.freeze({
+ processDMOperation: async (
+ dmOperation: DMLeaveThreadOperation,
+ viewerID: string,
+ utilities: ProcessDMOperationUtilities,
+ ) => {
+ const { editorID, time, messageID, threadID } = dmOperation;
+
+ const threadInfoOptional = utilities.getThreadInfo(threadID);
+ if (!threadInfoOptional || !threadInfoOptional.thick) {
+ // We can't perform this operation now. It should be queued for later.
+ return {
+ rawMessageInfos: [],
+ updateInfos: [],
+ };
+ }
+ const threadInfo: ThickRawThreadInfo = threadInfoOptional;
+ if (!userIsMember(threadInfo, editorID)) {
+ return {
+ rawMessageInfos: [],
+ updateInfos: [],
+ };
+ }
+
+ const leaveThreadMessage = {
+ type: messageTypes.LEAVE_THREAD,
+ id: messageID,
+ threadID,
+ creatorID: editorID,
+ time,
+ };
+
+ const updateInfos: Array<ClientUpdateInfo> = [];
+ if (viewerID === editorID) {
+ updateInfos.push({
+ type: updateTypes.DELETE_THREAD,
+ id: uuid.v4(),
+ time,
+ threadID,
+ });
+ } else {
+ const updatedThreadInfo = {
+ ...threadInfo,
+ members: threadInfo.members.filter(member => member.id !== editorID),
+ };
+ updateInfos.push({
+ type: updateTypes.UPDATE_THREAD,
+ id: uuid.v4(),
+ time,
+ threadInfo: updatedThreadInfo,
+ });
+ }
+
+ return {
+ rawMessageInfos: [leaveThreadMessage],
+ updateInfos,
+ };
+ },
+});
+
+export { leaveThreadSpec };
diff --git a/lib/types/dm-ops.js b/lib/types/dm-ops.js
--- a/lib/types/dm-ops.js
+++ b/lib/types/dm-ops.js
@@ -29,6 +29,7 @@
SEND_EDIT_MESSAGE: 'send_edit_message',
ADD_MEMBERS: 'add_members',
JOIN_THREAD: 'join_thread',
+ LEAVE_THREAD: 'leave_thread',
});
export type DMOperationType = $Values<typeof dmOperationTypes>;
@@ -186,6 +187,22 @@
rawEntryInfos: t.list(rawEntryInfoValidator),
});
+export type DMLeaveThreadOperation = {
+ +type: 'leave_thread',
+ +editorID: string,
+ +time: number,
+ +messageID: string,
+ +threadID: string,
+};
+export const dmLeaveThreadOperation: TInterface<DMLeaveThreadOperation> =
+ tShape<DMLeaveThreadOperation>({
+ type: tString(dmOperationTypes.LEAVE_THREAD),
+ editorID: tUserID,
+ time: t.Number,
+ messageID: t.String,
+ threadID: t.String,
+ });
+
export type DMOperation =
| DMCreateThreadOperation
| DMCreateSidebarOperation
@@ -193,7 +210,8 @@
| DMSendReactionMessageOperation
| DMSendEditMessageOperation
| DMAddMembersOperation
- | DMJoinThreadOperation;
+ | DMJoinThreadOperation
+ | DMLeaveThreadOperation;
export const dmOperationValidator: TUnion<DMOperation> = t.union([
dmCreateThreadOperationValidator,
dmCreateSidebarOperationValidator,
@@ -202,6 +220,7 @@
dmSendEditMessageOperation,
dmAddMembersOperation,
dmJoinThreadOperation,
+ dmLeaveThreadOperation,
]);
export type DMOperationResult = {

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