[core] Join group via code

fix #688

src/api/groups.controller.ts

@@ -23,6 +23,8 @@ import {
   CreateGroupRequest,
   DescriptionRequest,
   GroupsPaginationParams,
+  JoinGroupRequest,
+  JoinGroupResponse,
   ParticipantsRequest,
   SettingsSecurityChangeInfo,
   SubjectRequest,
@@ -44,6 +46,31 @@ export class GroupsController {
     return session.createGroup(request);
   }
 
+  @Get('join-info')
+  @SessionApiParam
+  @ApiOperation({ summary: 'Get info about the group before joining.' })
+  async joinInfoGroup(
+    @WorkingSessionParam session: WhatsappSession,
+    @Query() query: JoinGroupRequest,
+  ): Promise<any> {
+    // https://chat.whatsapp.com/123 => 123
+    const code = query.code.split('/').pop();
+    return session.joinInfoGroup(code);
+  }
+
+  @Post('join')
+  @SessionApiParam
+  @ApiOperation({ summary: 'Join group via code' })
+  async joinGroup(
+    @WorkingSessionParam session: WhatsappSession,
+    @Body() request: JoinGroupRequest,
+  ): Promise<JoinGroupResponse> {
+    // https://chat.whatsapp.com/123 => 123
+    const code = request.code.split('/').pop();
+    const id = await session.joinGroup(code);
+    return { id: id };
+  }
+
   @Get('')
   @SessionApiParam
   @ApiOperation({ summary: 'Get all groups.' })

src/core/abc/session.abc.ts

@@ -523,6 +523,14 @@ export abstract class WhatsappSession {
     throw new NotImplementedByEngineError();
   }
 
+  public joinGroup(code: string): Promise<string> {
+    throw new NotImplementedByEngineError();
+  }
+
+  public joinInfoGroup(code: string): Promise<any> {
+    throw new NotImplementedByEngineError();
+  }
+
   public getGroups(pagination: PaginationParams) {
     throw new NotImplementedByEngineError();
   }

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

@@ -1084,6 +1084,14 @@ export class WhatsappSessionNoWebCore extends WhatsappSession {
     return this.sock.groupCreate(request.name, participants);
   }
 
+  public joinGroup(code: string) {
+    return this.sock.groupAcceptInvite(code);
+  }
+
+  public joinInfoGroup(code: string) {
+    return this.sock.groupGetInviteInfo(code);
+  }
+
   public async getGroups(pagination: PaginationParams) {
     const groups = await this.store.getGroups(pagination);
     // return {id: group} mapping for backward compatability

src/core/engines/webjs/session.webjs.core.ts

@@ -762,6 +762,14 @@ export class WhatsappSessionWebJSCore extends WhatsappSession {
     return this.whatsapp.createGroup(request.name, participantIds);
   }
 
+  public joinGroup(code: string) {
+    return this.whatsapp.acceptInvite(code);
+  }
+
+  public joinInfoGroup(code: string) {
+    return this.whatsapp.getInviteInfo(code);
+  }
+
   public async getInfoAdminsOnly(id): Promise<SettingsSecurityChangeInfo> {
     const groupChat = (await this.whatsapp.getChatById(id)) as GroupChat;
     return {

src/structures/groups.dto.ts

@@ -57,6 +57,23 @@ export class CreateGroupRequest {
   participants: Array<Participant>;
 }
 
+export class JoinGroupRequest {
+  @ApiProperty({
+    description: 'Group code (123) or url (https://chat.whatsapp.com/123)',
+    example: 'https://chat.whatsapp.com/1234567890abcdef',
+  })
+  @IsString()
+  code: string;
+}
+
+export class JoinGroupResponse {
+  @ApiProperty({
+    description: 'Group ID',
+    example: '[email protected]',
+  })
+  id: string;
+}
+
 export enum GroupSortField {
   ID = 'id',
   SUBJECT = 'subject',