feat(NOWEB): expose group member-share-history-mode as a settable endpoint (#2283)

src/api/groups.controller.ts

@@ -41,6 +41,7 @@ import {
   JoinGroupResponse,
   ParticipantsRequest,
   SettingsMemberAddMode,
+  SettingsMemberShareHistoryMode,
   SettingsMembershipApproval,
   SettingsSecurityChangeInfo,
   SubjectRequest,
@@ -346,6 +347,28 @@ export class GroupsController {
     return session.getMemberAddMode(id);
   }
 
+  @Put(':id/settings/security/member-share-history-mode')
+  @SessionApiParam
+  @GroupIdApiParam
+  @CheckPolicies(CanSession(Action.Send, FromParam('session')))
+  @ApiOperation({
+    summary:
+      'Update settings - members can send message history to new members',
+    description:
+      'Updates the group settings for whether members can share message history with new members, or only admins can.',
+  })
+  @UsePipes(new ValidationPipe({ transform: true, whitelist: true }))
+  setMemberShareHistoryMode(
+    @WorkingSessionParam session: WhatsappSession,
+    @Param('id') id: string,
+    @Body() request: SettingsMemberShareHistoryMode,
+  ) {
+    return session.setMemberShareHistoryMode(
+      id,
+      request.membersCanShareHistory,
+    );
+  }
+
   @Put(':id/settings/security/membership-approval')
   @SessionApiParam
   @GroupIdApiParam

src/core/abc/session.abc.ts

@@ -1025,6 +1025,10 @@ export abstract class WhatsappSession {
     throw new NotImplementedByEngineError();
   }
 
+  public setMemberShareHistoryMode(id, value) {
+    throw new NotImplementedByEngineError();
+  }
+
   public getMembershipApprovalMode(
     id: string,
   ): Promise<SettingsMembershipApproval> {

src/core/engines/noweb/session.noweb.core.ts

@@ -28,6 +28,7 @@ import makeWASocket, {
 import { WACallEvent } from '@adiwajshing/baileys/lib/Types/Call';
 import { BaileysEventMap } from '@adiwajshing/baileys/lib/Types/Events';
 import { GroupMetadata } from '@adiwajshing/baileys/lib/Types/GroupMetadata';
+import { executeWMexQuery } from '@adiwajshing/baileys/lib/Socket/mex';
 import {
   Label as NOWEBLabel,
   LabelActionBody,
@@ -168,6 +169,7 @@ import {
   GroupParticipant,
   ParticipantsRequest,
   SettingsMemberAddMode,
+  SettingsMemberShareHistoryMode,
   SettingsMembershipApproval,
   SettingsSecurityChangeInfo,
 } from '@waha/structures/groups.dto';
@@ -296,6 +298,14 @@ export interface NowebConfig {
   waVersion: WAVersion;
 }
 
+// WhatsApp Web MEX (w:mex) doc/query_id for the group property mutation that sets
+// "members can send message history to new members". Captured from WhatsApp Web's
+// WAWebMexUpdateGroupPropertyJobMutation on 2026-09-25 (see whatsapp-rust
+// wacore/src/iq/mex_operations.rs, mod update_group_property). WhatsApp rotates these
+// ids when Web is updated -- if this mutation starts failing, re-capture the query_id
+// from a fresh WhatsApp Web session before assuming the endpoint itself is broken.
+const MEX_QUERY_ID_UPDATE_GROUP_PROPERTY = '9418211574894172';
+
 export class WhatsappSessionNoWebCore extends WhatsappSession {
   private START_ATTEMPT_DELAY_SECONDS = 2;
   private AUTO_RESTART_AFTER_SECONDS = 28 * 60;
@@ -2238,6 +2248,25 @@ export class WhatsappSessionNoWebCore extends WhatsappSession {
     return await this.sock.groupMemberAddMode(id, mode);
   }
 
+  @Activity()
+  public async setMemberShareHistoryMode(id, value) {
+    const mode = value ? 'ALL_MEMBER_SHARE' : 'ADMIN_SHARE';
+    const result = await executeWMexQuery<{ state?: string }>(
+      { group_id: id, update: { member_share_group_history_mode: mode } },
+      MEX_QUERY_ID_UPDATE_GROUP_PROPERTY,
+      'xwa2_group_update_property',
+      this.sock.query,
+      this.sock.generateMessageTag,
+    );
+    if (result?.state !== 'ACTIVE') {
+      throw new Error(
+        `Failed to set member share history mode for group '${id}': ` +
+          `unexpected state '${result?.state}'`,
+      );
+    }
+    return result;
+  }
+
   public async getMembershipApprovalMode(
     id: string,
   ): Promise<SettingsMembershipApproval> {

src/structures/groups.dto.ts

@@ -31,6 +31,11 @@ export class SettingsMemberAddMode {
   membersCanAddNewMember: boolean = true;
 }
 
+export class SettingsMemberShareHistoryMode {
+  @IsBoolean()
+  membersCanShareHistory: boolean = true;
+}
+
 export class SettingsMembershipApproval {
   @IsBoolean()
   newMembersApprovalRequired: boolean = false;