feat(group): add updateMemberAddMode endpoint

Expose the WhatsApp protocol's group "member add mode" setting
(supported by Baileys via groupMemberAddMode) as a new endpoint, so
clients can toggle whether non-admin members are allowed to add
participants to a group.

POST /group/updateMemberAddMode/{instance}?groupJid=<jid>
body: { "mode": "admin_add" | "all_member_add" }

- admin_add       → only admins can add new members
- all_member_add  → any member can add new members (WhatsApp default)

Mirrors the existing pattern of updateSetting:
- DTO  : GroupUpdateMemberAddModeDto
- Schema: updateMemberAddModeSchema (validates mode enum)
- Service: WhatsappBaileysService.updateMemberAddMode
- Controller: GroupController.updateMemberAddMode
- Route: POST /group/updateMemberAddMode

No breaking change. No new dependency.

Author: hassankaid

src/api/controllers/group.controller.ts

@@ -9,6 +9,7 @@ import {
   GroupSendInvite,
   GroupSubjectDto,
   GroupToggleEphemeralDto,
+  GroupUpdateMemberAddModeDto,
   GroupUpdateParticipantDto,
   GroupUpdateSettingDto,
 } from '@api/dto/group.dto';
@@ -74,6 +75,10 @@ export class GroupController {
     return await this.waMonitor.waInstances[instance.instanceName].updateGSetting(update);
   }
 
+  public async updateMemberAddMode(instance: InstanceDto, update: GroupUpdateMemberAddModeDto) {
+    return await this.waMonitor.waInstances[instance.instanceName].updateMemberAddMode(update);
+  }
+
   public async toggleEphemeral(instance: InstanceDto, update: GroupToggleEphemeralDto) {
     return await this.waMonitor.waInstances[instance.instanceName].toggleEphemeral(update);
   }

src/api/dto/group.dto.ts

@@ -54,3 +54,7 @@ export class GroupUpdateSettingDto extends GroupJid {
 export class GroupToggleEphemeralDto extends GroupJid {
   expiration: 0 | 86400 | 604800 | 7776000;
 }
+
+export class GroupUpdateMemberAddModeDto extends GroupJid {
+  mode: 'admin_add' | 'all_member_add';
+}

src/api/integrations/channel/whatsapp/whatsapp.baileys.service.ts

@@ -26,6 +26,7 @@ import {
   GroupSendInvite,
   GroupSubjectDto,
   GroupToggleEphemeralDto,
+  GroupUpdateMemberAddModeDto,
   GroupUpdateParticipantDto,
   GroupUpdateSettingDto,
 } from '@api/dto/group.dto';
@@ -4588,6 +4589,15 @@ export class BaileysStartupService extends ChannelStartupService {
     }
   }
 
+  public async updateMemberAddMode(update: GroupUpdateMemberAddModeDto) {
+    try {
+      await this.client.groupMemberAddMode(update.groupJid, update.mode);
+      return { update: 'success', mode: update.mode };
+    } catch (error) {
+      throw new BadRequestException('Error updating member add mode', error.toString());
+    }
+  }
+
   public async toggleEphemeral(update: GroupToggleEphemeralDto) {
     try {
       await this.client.groupToggleEphemeral(update.groupJid, update.expiration);

src/api/routes/group.router.ts

@@ -10,6 +10,7 @@ import {
   GroupSendInvite,
   GroupSubjectDto,
   GroupToggleEphemeralDto,
+  GroupUpdateMemberAddModeDto,
   GroupUpdateParticipantDto,
   GroupUpdateSettingDto,
 } from '@api/dto/group.dto';
@@ -25,6 +26,7 @@ import {
   updateGroupDescriptionSchema,
   updateGroupPictureSchema,
   updateGroupSubjectSchema,
+  updateMemberAddModeSchema,
   updateParticipantsSchema,
   updateSettingsSchema,
 } from '@validate/validate.schema';
@@ -176,6 +178,16 @@ export class GroupRouter extends RouterBroker {
 
         res.status(HttpStatus.CREATED).json(response);
       })
+      .post(this.routerPath('updateMemberAddMode'), ...guards, async (req, res) => {
+        const response = await this.groupValidate<GroupUpdateMemberAddModeDto>({
+          request: req,
+          schema: updateMemberAddModeSchema,
+          ClassRef: GroupUpdateMemberAddModeDto,
+          execute: (instance, data) => groupController.updateMemberAddMode(instance, data),
+        });
+
+        res.status(HttpStatus.CREATED).json(response);
+      })
       .post(this.routerPath('toggleEphemeral'), ...guards, async (req, res) => {
         const response = await this.groupValidate<GroupToggleEphemeralDto>({
           request: req,

src/validate/group.schema.ts

@@ -191,3 +191,17 @@ export const updateGroupDescriptionSchema: JSONSchema7 = {
   required: ['groupJid', 'description'],
   ...isNotEmpty('groupJid', 'description'),
 };
+
+export const updateMemberAddModeSchema: JSONSchema7 = {
+  $id: v4(),
+  type: 'object',
+  properties: {
+    groupJid: { type: 'string' },
+    mode: {
+      type: 'string',
+      enum: ['admin_add', 'all_member_add'],
+    },
+  },
+  required: ['groupJid', 'mode'],
+  ...isNotEmpty('groupJid', 'mode'),
+};