fix(repository): Move backend code into subdirectory

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

backend/src/api/private/groups/groups.controller.ts

@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: 2022 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+import { Controller, Get, Param, UseGuards } from '@nestjs/common';
+import { ApiTags } from '@nestjs/swagger';
+
+import { GroupInfoDto } from '../../../groups/group-info.dto';
+import { GroupsService } from '../../../groups/groups.service';
+import { SessionGuard } from '../../../identity/session.guard';
+import { ConsoleLoggerService } from '../../../logger/console-logger.service';
+import { OpenApi } from '../../utils/openapi.decorator';
+
+@UseGuards(SessionGuard)
+@OpenApi(401, 403)
+@ApiTags('groups')
+@Controller('groups')
+export class GroupsController {
+  constructor(
+    private readonly logger: ConsoleLoggerService,
+    private groupService: GroupsService,
+  ) {
+    this.logger.setContext(GroupsController.name);
+  }
+
+  @Get(':groupName')
+  @OpenApi(200)
+  async getGroup(@Param('groupName') groupName: string): Promise<GroupInfoDto> {
+    return this.groupService.toGroupDto(
+      await this.groupService.getGroupByName(groupName),
+    );
+  }
+}