# All files / modules/storage/services storage.service.ts

95.9% Statements 117/122
90% Branches 36/40
100% Functions 17/17
96.46% Lines 109/113

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     import {
      Injectable,
      Logger,
      BadRequestException,
      NotFoundException,
      ForbiddenException,
    } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository, IsNull, Like, ILike } from 'typeorm';
    import { v4 as uuid } from 'uuid';
    import { FileEntity, FileStatus, FileVisibility } from '../entities/file.entity';
    import { PendingUploadEntity } from '../entities/pending-upload.entity';
    import { StorageUsageEntity } from '../entities/storage-usage.entity';
    import { S3Provider } from '../providers/s3.provider';
    import {
      GetUploadUrlDto,
      ConfirmUploadDto,
      ListFilesDto,
      UpdateFileDto,
      PresignedUrlResponseDto,
      FileResponseDto,
      FileListResponseDto,
      DownloadUrlResponseDto,
      StorageUsageResponseDto,
    } from '../dto';

    // Allowed MIME types
    const ALLOWED_MIME_TYPES: Record<string, string[]> = {
      images: ['image/jpeg', 'image/png', 'image/gif', 'image/webp', 'image/svg+xml'],
      documents: [
        'application/pdf',
        'application/msword',
        'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
      ],
      spreadsheets: [
        'application/vnd.ms-excel',
        'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
      ],
      data: ['text/csv', 'application/json', 'text/plain'],
    };

    const BLOCKED_EXTENSIONS = ['.exe', '.bat', '.sh', '.php', '.js', '.cmd', '.com', '.scr'];

    @Injectable()
    export class StorageService {
      private readonly logger = new Logger(StorageService.name);

      constructor(
        @InjectRepository(FileEntity)
        private readonly fileRepository: Repository<FileEntity>,
        @InjectRepository(PendingUploadEntity)
        private readonly pendingUploadRepository: Repository<PendingUploadEntity>,
        @InjectRepository(StorageUsageEntity)
        private readonly usageRepository: Repository<StorageUsageEntity>,
        private readonly s3Provider: S3Provider,
      ) {}

      async getUploadUrl(
        tenantId: string,
        userId: string,
        dto: GetUploadUrlDto,
      ): Promise<PresignedUrlResponseDto> {
        // Validate storage is configured
        if (!this.s3Provider.isConfigured()) {
          throw new BadRequestException('Storage not configured');
        }

        // Validate MIME type
        if (!this.isAllowedMimeType(dto.mimeType)) {
          throw new BadRequestException(`File type not allowed: ${dto.mimeType}`);
        }

        // Validate extension
        if (this.hasBlockedExtension(dto.filename)) {
          throw new BadRequestException('File extension not allowed');
        }

        // Check storage limits
        const canUpload = await this.canUpload(tenantId, dto.sizeBytes);
        if (!canUpload.allowed) {
          throw new ForbiddenException(canUpload.reason);
        }

        // Generate upload ID and path
        const uploadId = uuid();
        const folder = dto.folder || 'files';
        const path = this.s3Provider.generatePath(tenantId, folder, uploadId, dto.filename);
        const bucket = this.s3Provider.getBucket();

        // Get presigned URL
        const presigned = await this.s3Provider.getUploadUrl({
          bucket,
          key: path,
          contentType: dto.mimeType,
          contentLength: dto.sizeBytes,
          metadata: {
            'tenant-id': tenantId,
            'upload-id': uploadId,
            'user-id': userId,
          },
        });

        // Save pending upload
        const pendingUpload = this.pendingUploadRepository.create({
          id: uploadId,
          tenant_id: tenantId,
          user_id: userId,
          filename: this.sanitizeFilename(dto.filename),
          original_name: dto.filename,
          mime_type: dto.mimeType,
          size_bytes: dto.sizeBytes,
          folder,
          bucket,
          path,
          provider: this.s3Provider.getProvider(),
          expires_at: presigned.expiresAt,
        });

        await this.pendingUploadRepository.save(pendingUpload);

        return {
          uploadId,
          url: presigned.url,
          expiresAt: presigned.expiresAt,
          maxSize: dto.sizeBytes,
        };
      }

      async confirmUpload(
        tenantId: string,
        userId: string,
        dto: ConfirmUploadDto,
      ): Promise<FileResponseDto> {
        // Find pending upload
        const pending = await this.pendingUploadRepository.findOne({
          where: {
            id: dto.uploadId,
            tenant_id: tenantId,
            status: 'pending',
          },
        });

        if (!pending) {
          throw new NotFoundException('Upload not found or expired');
        }

        if (pending.expires_at < new Date()) {
          await this.pendingUploadRepository.update(pending.id, { status: 'expired' });
          throw new BadRequestException('Upload expired');
        }

        // Verify file exists in S3
        const headResult = await this.s3Provider.headObject(pending.path);
        if (!headResult) {
          await this.pendingUploadRepository.update(pending.id, { status: 'failed' });
          throw new BadRequestException('File not found in storage');
        }

        // Create file record
        const file = this.fileRepository.create({
          tenant_id: tenantId,
          uploaded_by: userId,
          filename: pending.filename,
          original_name: pending.original_name,
          mime_type: pending.mime_type,
          size_bytes: headResult.contentLength,
          bucket: pending.bucket,
          path: pending.path,
          provider: pending.provider,
          folder: pending.folder,
          status: FileStatus.READY,
          visibility: FileVisibility.PRIVATE,
          metadata: dto.metadata || {},
        });

        await this.fileRepository.save(file);

        // Mark pending as completed
        await this.pendingUploadRepository.update(pending.id, {
          status: 'completed',
          completed_at: new Date(),
        });

        return this.toFileResponse(file);
      }

      async listFiles(tenantId: string, dto: ListFilesDto): Promise<FileListResponseDto> {
        const { page = 1, limit = 20, folder, mimeType, search } = dto;
        const skip = (page - 1) * limit;

        const where: any = {
          tenant_id: tenantId,
          deleted_at: IsNull(),
          status: FileStatus.READY,
        };

        if (folder) {
          where.folder = folder;
        }

        if (mimeType) {
          where.mime_type = Like(`${mimeType}%`);
        }

        if (search) {
          where.original_name = ILike(`%${search}%`);
        }

        const [files, total] = await this.fileRepository.findAndCount({
          where,
          order: { created_at: 'DESC' },
          skip,
          take: limit,
        });

        return {
          data: files.map((f) => this.toFileResponse(f)),
          total,
          page,
          limit,
          totalPages: Math.ceil(total / limit),
        };
      }

      async getFile(tenantId: string, fileId: string): Promise<FileResponseDto> {
        const file = await this.fileRepository.findOne({
          where: {
            id: fileId,
            tenant_id: tenantId,
            deleted_at: IsNull(),
          },
        });

        if (!file) {
          throw new NotFoundException('File not found');
        }

        return this.toFileResponse(file);
      }

      async getDownloadUrl(tenantId: string, fileId: string): Promise<DownloadUrlResponseDto> {
        const file = await this.fileRepository.findOne({
          where: {
            id: fileId,
            tenant_id: tenantId,
            deleted_at: IsNull(),
            status: FileStatus.READY,
          },
        });

        if (!file) {
          throw new NotFoundException('File not found');
        }

        const result = await this.s3Provider.getDownloadUrl(file.path);

        return {
          url: result.url,
          expiresAt: result.expiresAt,
        };
      }

      async updateFile(
        tenantId: string,
        fileId: string,
        dto: UpdateFileDto,
      ): Promise<FileResponseDto> {
        const file = await this.fileRepository.findOne({
          where: {
            id: fileId,
            tenant_id: tenantId,
            deleted_at: IsNull(),
          },
        });

        if (!file) {
          throw new NotFoundException('File not found');
        }

        if (dto.folder) file.folder = dto.folder;
        if (dto.visibility) file.visibility = dto.visibility;
        if (dto.metadata) file.metadata = { ...file.metadata, ...dto.metadata };

        await this.fileRepository.save(file);

        return this.toFileResponse(file);
      }

      async deleteFile(tenantId: string, fileId: string): Promise<void> {
        const file = await this.fileRepository.findOne({
          where: {
            id: fileId,
            tenant_id: tenantId,
            deleted_at: IsNull(),
          },
        });

        if (!file) {
          throw new NotFoundException('File not found');
        }

        // Soft delete
        file.deleted_at = new Date();
        file.status = FileStatus.DELETED;
        await this.fileRepository.save(file);

        // Delete from S3 (optional - could be done via background job)
        try {
          await this.s3Provider.deleteObject(file.path);
        } catch (error) {
          this.logger.warn(`Failed to delete file from S3: ${file.path}`, error);
        }
      }

      async getUsage(tenantId: string): Promise<StorageUsageResponseDto> {
        let usage = await this.usageRepository.findOne({
          where: { tenant_id: tenantId },
        });

        if (!usage) {
          // Create default usage record
          usage = this.usageRepository.create({
            tenant_id: tenantId,
            total_files: 0,
            total_bytes: 0,
          });
          await this.usageRepository.save(usage);
        }

        // Get files by folder
        const folderStats = await this.fileRepository
          .createQueryBuilder('f')
          .select('f.folder', 'folder')
          .addSelect('COUNT(*)', 'count')
          .where('f.tenant_id = :tenantId', { tenantId })
          .andWhere('f.deleted_at IS NULL')
          .andWhere('f.status = :status', { status: FileStatus.READY })
          .groupBy('f.folder')
          .getRawMany();

        const filesByFolder: Record<string, number> = {};
        for (const stat of folderStats) {
          filesByFolder[stat.folder] = parseInt(stat.count, 10);
        }

        const usagePercent = usage.max_bytes
          ? Math.round((Number(usage.total_bytes) / Number(usage.max_bytes)) * 10000) / 100
          : 0;

        return {
          totalFiles: usage.total_files,
          totalBytes: Number(usage.total_bytes),
          maxBytes: usage.max_bytes ? Number(usage.max_bytes) : null,
          maxFileSize: usage.max_file_size ? Number(usage.max_file_size) : null,
          usagePercent,
          filesByFolder,
        };
      }

      // ==================== Helper Methods ====================

      private isAllowedMimeType(mimeType: string): boolean {
        const allAllowed = Object.values(ALLOWED_MIME_TYPES).flat();
        return allAllowed.includes(mimeType);
      }

      private hasBlockedExtension(filename: string): boolean {
        const lower = filename.toLowerCase();
        return BLOCKED_EXTENSIONS.some((ext) => lower.endsWith(ext));
      }

      private sanitizeFilename(filename: string): string {
        return filename.replace(/[^a-zA-Z0-9.-]/g, '_');
      }

      private async canUpload(
        tenantId: string,
        sizeBytes: number,
      ): Promise<{ allowed: boolean; reason?: string }> {
        const usage = await this.usageRepository.findOne({
          where: { tenant_id: tenantId },
        });

        if (!usage) {
          return { allowed: true };
        }

        if (usage.max_file_size && sizeBytes > Number(usage.max_file_size)) {
          return {
            allowed: false,
            reason: `File size exceeds limit (max: ${this.formatBytes(Number(usage.max_file_size))})`,
          };
        }

        Iif (
          usage.max_bytes &&
          Number(usage.total_bytes) + sizeBytes > Number(usage.max_bytes)
        ) {
          return {
            allowed: false,
            reason: `Storage limit exceeded (max: ${this.formatBytes(Number(usage.max_bytes))})`,
          };
        }

        return { allowed: true };
      }

      private formatBytes(bytes: number): string {
        if (bytes < 1024) return `${bytes} B`;
        Iif (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
        if (bytes < 1024 * 1024 * 1024) return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
        return `${(bytes / (1024 * 1024 * 1024)).toFixed(1)} GB`;
      }

      private toFileResponse(file: FileEntity): FileResponseDto {
        return {
          id: file.id,
          filename: file.filename,
          originalName: file.original_name,
          mimeType: file.mime_type,
          sizeBytes: Number(file.size_bytes),
          folder: file.folder,
          visibility: file.visibility,
          thumbnails: file.thumbnails,
          metadata: file.metadata,
          createdAt: file.created_at,
          updatedAt: file.updated_at,
        };
      }
    }