codeocean-scraper

Batch download student submission from codeocean

Setup

Clone project
Install gradle
Run gradle shadowJar
Project is now build as a self-contained jar file in build/libs

Running

Execute java -jar path/to/jar exerciseUrl targetDirectory deadline

Parameter explanation:

exerciseUrl: URL to the statistics page of the exercise you want to download. Should have the format https://codeocean.url/exercises/<someId>/statistics.
targetDirectory: All downloaded submissions will be saved under this directory. The directory must already exist.
deadline: The deadline of the exercise, if a submission was made after the deadline, a file called DEADLINE_EXCEEDED will be created in the output directory. Must be of the form YYYY-MM-DDThh:mm+tz:tz (in other words, an ISO 8601 date & time, as accepted by java.time.OffsetDateTime.parse).

Authentication

The scraper uses session keys to authenticate with CodeOcean. These are cached per CodeOcean installation in ~/.codeocean-scraper.json. If no cached session key exists or the cached one has been invalidated, you are prompted for an email and password to sign in.

Result

After execution the target directory will contain a subdirectory for each user.

Single file mode

If there was only one file associated with the exercises, these subdirectories can contain the following content:

name.java: Last submitted version.
name - ASSESSED AFTER SUBMIT.java: Version that was scored (but not submitted) after the last submitted version.
name - ASSESSED ONLY.java: Last assessed version, if no version was ever submitted.
name - NO ASSESS OR SUBMIT.java: No version was ever scored or submitted. Contains the last autosave.
name - TOP SCORE.java: Version with the highest score. Only included if not matched by any of the other criteria. If multiple such versions exists, the last one is chosen.
error.txt: Created if the server responded with an error when trying to download the submission page. Contains error details.

All *.java files will also contain an initial comment with the url to the submission page, and the score of the submission.

Multi file mode

If more than one file are associated with the exercise, the student directories may contain one or more subdirectories labeled SUBMIT, ASSESSED AFTER SUBMIT, ASSESSED ONLY, NO ASSESS OR SUBMIT or TOP SCORE. The meanings are the same as described above with SUBMIT being equivalent to no suffix (name.java). In this mode the metadata (url and score) will be placed in files called url.txt and score.txt withing the different subdirectories.