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  1. XWiki Platform
  2. XWIKI-14000

Uploading a file near to the configured max size limit results in a generic server error

    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 7.4.5
    • Fix Version/s: None
    • Component/s: Attachments
    • Labels:
      None
    • Difficulty:
      Unknown
    • Similar issues:

      Description

      Repro on vanilla XWiki 7.4.5 install, which uses a Maximum File Size limit of 32.0 MiB, or 33554432 bytes:

      1. Create a file that is exactly 32.0 MiB. On MacOS this can be done with: mkfile $((32 * 1024 * 1024)) ~/32mb.out
      2. Upload the file as an attachment to XWiki.
      3. Observe generic server error: "An error occurred while uploading 32mb.out"
      4. Generate a 33.0 MiB file and try uploading it.
      5. Observe specific correct user-friendly error: The file 33mb.out is too large. Please choose files under 32.0 mb"

      The above can be repeated with different file sizes and the following pattern is then seen:

      SIZE_LIMIT - 500 bytes: upload is successful
      SIZE_LIMIT - 384 bytes: An error occurred while uploading <filename>
      SIZE_LIMIT bytes: An error occurred while uploading <filename>
      SIZE_LIMIT + 128 bytes: An error occurred while uploading <filename>
      SIZE_LIMIT + 1024 bytes: The file <filename> is too large. Please choose files under 32.0 mb"

      I haven't done a full analysis to discover precisely in what range of values the generic error gets produced, but it definitely seems to only be a problem if the uploaded file is within <= 1024 bytes of the Maximum File Size setting.

      From a user perspective this is problematic because the error message doesn't tell them why their upload failed. I think the desired behavior is either that the upload succeeds or you get the user-friendly "is too large" error.

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            • Assignee:
              Unassigned
              Reporter:
              joelthor Joel Thornton
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                Updated:
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