comments implement

src/modules/comment/application/services/comment-access.service.ts

@@ -0,0 +1,39 @@
+import { Inject, Injectable } from '@nestjs/common';
+import { COMMENT_REPOSITORY, type ICommentRepository } from '../../domain/repositories/comment.repository.interface.js';
+import { ISSUE_REPOSITORY, type IIssueRepository } from '../../../issue/domain/repositories/issue.repository.interface.js';
+import { Comment } from '../../domain/entities/comment.entity.js';
+import { CommentNotFoundException } from '../../domain/exceptions/comment-not-found.exception.js';
+
+@Injectable()
+export class CommentAccessService {
+  constructor(
+    @Inject(COMMENT_REPOSITORY)
+    private readonly commentRepository: ICommentRepository,
+    @Inject(ISSUE_REPOSITORY)
+    private readonly issueRepository: IIssueRepository,
+  ) {}
+
+  /** Видна ли задача пользователю (то же правило, что в IIssueRepository.findById) */
+  async isIssueVisible(issueId: number, userId: string): Promise<boolean> {
+    return (await this.issueRepository.findById(issueId, userId)) !== null;
+  }
+
+  /**
+   * Возвращает неудалённый комментарий, если его задача видна пользователю.
+   * Иначе — CommentNotFoundException, чтобы не раскрывать существование
+   * комментариев к чужим задачам.
+   */
+  async getVisibleComment(id: string, userId: string): Promise<Comment> {
+    const comment = await this.commentRepository.findById(id);
+    if (!comment || comment.isDeleted) {
+      throw new CommentNotFoundException(id);
+    }
+
+    const issue = await this.issueRepository.findById(comment.issueId, userId);
+    if (!issue) {
+      throw new CommentNotFoundException(id);
+    }
+
+    return comment;
+  }
+}

src/modules/comment/application/services/comment-author-expander.service.ts

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+import { Injectable } from '@nestjs/common';
+import { Comment } from '../../domain/entities/comment.entity.js';
+import { CommentDto } from '../dto/comment.dto.js';
+import { CommentApplicationMapper } from '../mappers/comment-application.mapper.js';
+import { GetUsersUseCase } from '../../../user/application/use-cases/get-users/get-users.use-case.js';
+import { GetUsersQuery } from '../../../user/application/use-cases/get-users/get-users.query.js';
+
+/** Раскрывает автора комментария (или списка комментариев) в полноценного пользователя */
+@Injectable()
+export class CommentAuthorExpanderService {
+  constructor(private readonly getUsersUseCase: GetUsersUseCase) {}
+
+  async expand(comment: Comment): Promise<CommentDto> {
+    const [dto] = await this.expandAll([comment]);
+    return dto!;
+  }
+
+  async expandAll(comments: Comment[]): Promise<CommentDto[]> {
+    if (comments.length === 0) return [];
+
+    const userIds = [...new Set(comments.map((comment) => comment.authorId).filter((id): id is string => Boolean(id)))];
+    const users = userIds.length > 0 ? await this.getUsersUseCase.execute(new GetUsersQuery(userIds)) : [];
+    const usersById = new Map(users.map((user) => [user.id, user]));
+
+    return comments.map((comment) => CommentApplicationMapper.toDto(comment, usersById));
+  }
+}

src/modules/comment/application/services/comment-events.service.ts

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+import { Injectable } from '@nestjs/common';
+import { Observable, Subject } from 'rxjs';
+import { CommentDto } from '../dto/comment.dto.js';
+
+export type CommentEventType = 'comment.created' | 'comment.updated' | 'comment.deleted';
+
+export interface CommentEvent {
+  type: CommentEventType;
+  comment: CommentDto;
+}
+
+/**
+ * In-process шина событий comment-модуля для SSE-подписчиков
+ * (по аналогии с IssueEventsService). Работает в пределах одного
+ * инстанса приложения — для нескольких инстансов понадобится Redis pub/sub.
+ */
+@Injectable()
+export class CommentEventsService {
+  private readonly events$ = new Subject<CommentEvent>();
+
+  emit(type: CommentEventType, comment: CommentDto): void {
+    this.events$.next({ type, comment });
+  }
+
+  onEvents(): Observable<CommentEvent> {
+    return this.events$.asObservable();
+  }
+}