Method writeFile

pro/src/fsBox.ts:624–834

(
    key: string,
    content: ArrayBuffer,
    mtime: number,
    ctime: number
  )

  }

  async writeFile(
    key: string,
    content: ArrayBuffer,
    mtime: number,
    ctime: number
  ): Promise<Entity> {
    if (key.endsWith("/")) {
      throw Error(`should not call writeFile on ${key}`);
    }

    await this._init();

    const prevCachedEntity: BoxEntity | undefined = this.keyToBoxEntity[key];
    const prevFileID: string | undefined = prevCachedEntity?.id;

    const contentType =
      mime.contentType(mime.lookup(key) || DEFAULT_CONTENT_TYPE) ||
      DEFAULT_CONTENT_TYPE;

    let parentID: string | undefined = undefined;
    let parentFolderPath: string | undefined = undefined;

    // "xxx" => []
    // "xxx/yyy/zzz.md" => ["xxx", "xxx/yyy"]
    const folderLevels = getFolderLevels(key);
    if (folderLevels.length === 0) {
      // root
      parentID = this.baseDirID;
      parentFolderPath = "";
    } else {
      parentFolderPath = `${folderLevels[folderLevels.length - 1]}/`;
      if (!(parentFolderPath in this.keyToBoxEntity)) {
        throw Error(
          `parent of ${key}: ${parentFolderPath} is not created before??`
        );
      }
      parentID = this.keyToBoxEntity[parentFolderPath].id;
    }

    const fileItself = key.split("/").pop()!;

    const BIG_FILE_THRESHOLD = 20000000; // box api hard coded...
    if (content.byteLength <= BIG_FILE_THRESHOLD) {
      const formData = new FormData();
      const attributes = {
        name: fileItself,
        parent: { id: parentID },
        content_created_at: unixTimeToStr(ctime),
        content_modified_at: unixTimeToStr(mtime),
      };
      formData.append("attributes", JSON.stringify(attributes));
      formData.append("file", new Blob([content], { type: contentType }));

      let url = "";
      if (prevFileID === undefined) {
        // create new file
        // https://developer.box.com/reference/post-files-content/
        url = `https://upload.box.com/api/2.0/files/content`;