Method open

src/backend/Dropbox.ts:490–530

(path: string, flags: FileFlag, mode: number, cb: BFSCallback<File>)

  }

  public open(path: string, flags: FileFlag, mode: number, cb: BFSCallback<File>): void {
    // Try and get the file's contents
    this._client.readFile(path, (error, content, dbStat) => {
      if (error) {
        // If the file's being opened for reading and doesn't exist, return an
        // error
        if (flags.isReadable()) {
          cb(this.convert(error, path));
        } else {
          switch (error.status) {
            // If it's being opened for writing or appending, create it so that
            // it can be written to
            case Dropbox.ApiError.NOT_FOUND:
              const ab = new ArrayBuffer(0);
              return this._writeFileStrict(path, ab, (error2: ApiError, stat?: Dropbox.File.Stat) => {
                if (error2) {
                  cb(error2);
                } else {
                  const file = this._makeFile(path, flags, stat!, arrayBuffer2Buffer(ab));
                  cb(null, file);
                }
              });
            default:
              return cb(this.convert(error, path));
          }
        }
      } else {
        // No error
        let buffer: Buffer;
        // Dropbox.js seems to set `content` to `null` rather than to an empty
        // buffer when reading an empty file. Not sure why this is.
        if (content === null) {
          buffer = emptyBuffer();
        } else {
          buffer = arrayBuffer2Buffer(content!);
        }
        const file = this._makeFile(path, flags, dbStat!, buffer);
        return cb(null, file);
      }
    });
  }

  public _writeFileStrict(p: string, data: ArrayBuffer, cb: BFSCallback<Dropbox.File.Stat>): void {
    const parent = path.dirname(p);