Secure computer-implemented execution and evaluation of programming assignments for on demand courses

A computer system comprising:

• a processor;
• a memory;
• and
• a repository including an online course,
• the processor and memory configured to:
• receive a student's output for a programming assignment in the online course;
• receive code for a custom grader application for grading the student's output;
• create a base custom grader container including the code for the custom grader application;
• associate the base custom grader container with the online course included in the repository;
• evaluate the base custom grader container by executing the custom grader application in the base custom grader container;
• determine that the custom grader application violates a predetermined criterion;
• modify the base custom grader container to prevent the executing of the custom grader application from violating the predetermined criterion;
• and
• store, in the repository and in association with the online course, the modified base custom grader container including the custom grader application as a custom grader container image.

A computer system including a processor and a memory having instructions stored thereon, the instructions, when executed by the processor, causing the computing system to:

• receive code for a custom grader application;
• create a base custom grader container including the code for the custom grader application;
• associate the base custom grader container with an online course included in a repository;
• evaluate the base custom grader container by executing the custom grader application in the base custom grader container;
• determine that the custom grader application violates a predetermined criterion;
• modify the base custom grader container to prevent the executing of the custom grader application from violating the predetermined criterion;
• and
• store, in the repository and in association with the online course, the modified base custom grader container including the custom grader application as a custom grader container image.