medusa-store/packages/modules/file/src/services/file-module-service.ts

import type { Readable } from "stream"
import {
  Context,
  CreateFileDTO,
  GetUploadFileUrlDTO,
  FileDTO,
  UploadFileUrlDTO,
  FileTypes,
  FilterableFileProps,
  FindConfig,
  ModuleJoinerConfig,
} from "@medusajs/framework/types"

import { joinerConfig } from "../joiner-config"
import FileProviderService from "./file-provider-service"
import { MedusaError } from "@medusajs/framework/utils"

type InjectedDependencies = {
  fileProviderService: FileProviderService
}

export default class FileModuleService implements FileTypes.IFileModuleService {
  protected readonly fileProviderService_: FileProviderService
  constructor({ fileProviderService }: InjectedDependencies) {
    this.fileProviderService_ = fileProviderService
  }

  __joinerConfig(): ModuleJoinerConfig {
    return joinerConfig
  }

  getProvider() {
    return this.fileProviderService_
  }

  createFiles(
    data: CreateFileDTO[],
    sharedContext?: Context
  ): Promise<FileDTO[]>
  createFiles(data: CreateFileDTO, sharedContext?: Context): Promise<FileDTO>

  async createFiles(
    data: CreateFileDTO[] | CreateFileDTO
  ): Promise<FileDTO[] | FileDTO> {
    const input = Array.isArray(data) ? data : [data]
    // TODO: Validate file mime type, have config for allowed types

    const files = await Promise.all(
      input.map((file) => this.fileProviderService_.upload(file))
    )
    const result = files.map((file) => ({
      id: file.key,
      url: file.url,
    }))

    return Array.isArray(data) ? result : result[0]
  }

  getUploadFileUrls(
    data: GetUploadFileUrlDTO[],
    sharedContext?: Context
  ): Promise<UploadFileUrlDTO[]>
  getUploadFileUrls(
    data: GetUploadFileUrlDTO,
    sharedContext?: Context
  ): Promise<UploadFileUrlDTO>

  async getUploadFileUrls(
    data: GetUploadFileUrlDTO[] | GetUploadFileUrlDTO
  ): Promise<UploadFileUrlDTO[] | UploadFileUrlDTO> {
    const input = Array.isArray(data) ? data : [data]

    const result = await Promise.all(
      input.map((file) => this.fileProviderService_.getPresignedUploadUrl(file))
    )

    return Array.isArray(data) ? result : result[0]
  }

  async deleteFiles(ids: string[], sharedContext?: Context): Promise<void>
  async deleteFiles(id: string, sharedContext?: Context): Promise<void>
  async deleteFiles(ids: string[] | string): Promise<void> {
    const input = Array.isArray(ids) ? ids : [ids]
    await this.fileProviderService_.delete(
      input.map((id) => {
        return { fileKey: id }
      })
    )
  }

  async retrieveFile(id: string): Promise<FileDTO> {
    const res = await this.fileProviderService_.getPresignedDownloadUrl({
      fileKey: id,
    })

    return {
      id,
      url: res,
    }
  }

  async listFiles(
    filters?: FilterableFileProps,
    config?: FindConfig<FileDTO>,
    sharedContext?: Context
  ): Promise<FileDTO[]> {
    if (!filters?.id) {
      throw new MedusaError(
        MedusaError.Types.INVALID_DATA,
        "Listing of files is only supported when filtering by ID."
      )
    }

    const ids = Array.isArray(filters?.id) ? filters?.id : [filters?.id]

    const res = await Promise.all(
      ids.map(async (id) => {
        const res = await this.fileProviderService_.getPresignedDownloadUrl({
          fileKey: id,
        })
        return { id, url: res }
      })
    )

    return res
  }

  async listAndCountFiles(
    filters?: FilterableFileProps,
    config?: FindConfig<FileDTO>,
    sharedContext?: Context
  ): Promise<[FileDTO[], number]> {
    if (!filters?.id) {
      throw new MedusaError(
        MedusaError.Types.INVALID_DATA,
        "Listing of files is only supported when filtering by ID."
      )
    }

    const ids = Array.isArray(filters?.id) ? filters?.id : [filters?.id]

    const res = await Promise.all(
      ids.map(async (id) => {
        const res = await this.fileProviderService_.getPresignedDownloadUrl({
          fileKey: id,
        })
        return { id, url: res }
      })
    )

    return [res, res.length]
  }

  /**
   * Get the file contents as a readable stream.
   *
   * @example
   * const stream = await fileModuleService.getAsStream("file_123")
   * writeable.pipe(stream)
   */
  getDownloadStream(id: string): Promise<Readable> {
    return this.fileProviderService_.getDownloadStream({ fileKey: id })
  }

  /**
   * Get the file contents as a Node.js Buffer
   *
   * @example
   * const contents = await fileModuleService.getAsBuffer("file_123")
   * contents.toString('utf-8')
   */
  getAsBuffer(id: string): Promise<Buffer> {
    return this.fileProviderService_.getAsBuffer({ fileKey: id })
  }
}