Client_max_body_size does not work for chunk uploading

JupyterHub
,
1

I am using JH on k8s version 3.3.7 behind a nginx. I just want the user to upload files with size less than 10M. So I added the configuration in nginx.conf “client_max_body_size 10M”. However, this does not prevent users uploading files that greater than 10M.
From the browser debug console, I can see that the file has been separated into chunks of size 1M, then they are sent to the sever side. I guess that’s why the nginx did not block this.

I see some relevant code of jupyterlab in packages.filebrowser.src.model.ts (may be the same code used in JH):

export const CHUNK_SIZE = 1024 * 1024;
async upload(file: File): Promise<Contents.IModel> {
    // We do not support Jupyter Notebook version less than 4, and Jupyter
    // Server advertises itself as version 1 and supports chunked
    // uploading. We assume any version less than 4.0.0 to be Jupyter Server
    // instead of Jupyter Notebook.
    const serverVersion = PageConfig.getNotebookVersion();
    const supportsChunked =
      serverVersion < [4, 0, 0] /* Jupyter Server */ ||
      serverVersion >= [5, 1, 0]; /* Jupyter Notebook >= 5.1.0 */
    const largeFile = file.size > LARGE_FILE_SIZE;

    if (largeFile && !supportsChunked) {
      const msg = this._trans.__(
        'Cannot upload file (>%1 MB). %2',
        LARGE_FILE_SIZE / (1024 * 1024),
        file.name
      );
      console.warn(msg);
      throw msg;
    }

    const err = 'File not uploaded';
    if (largeFile && !(await this._shouldUploadLarge(file))) {
      throw 'Cancelled large file upload';
    }
    await this._uploadCheckDisposed();
    await this.refresh();
    await this._uploadCheckDisposed();
    if (
      this._items.find(i => i.name === file.name) &&
      !(await shouldOverwrite(file.name))
    ) {
      throw err;
    }
    await this._uploadCheckDisposed();
    const chunkedUpload = supportsChunked && file.size > CHUNK_SIZE;
    return await this._upload(file, chunkedUpload);
  }

Is there a config to set the chunk size bigger or a workaround to only allow users upload files with size < 10M? Thanks.

2

JupyterHub won’t be able to block this since it only starts the server then passes everything through, so it’ll have to be in JupyterLab, or perhaps JupyterServer.

3

Thank you for the reply, moved it to the jupyterlab category.