I think this could be really useful. Figuring out the folder keys easily means better distribution of google docs and assignments. Cool stuff.
Get Folders Google Spreadsheets App Script
One of my teachers was looking for a solution to pull the folder keys out of the folders created by Hapara so they could use them with other tools like Doctopus. I imagine this could be helpful with Classroom and other tools as well. To make it as simple as possible, my team and I put together this sheet. Drop it in any root folder and run “Get Folders” from the menu and it will pull the name, folder key, and url for any subfolders.