Because of subdirectories, adding a new project requires restarting Sipi

[benjamingeer]

Knora PR dasch-swiss/dsp-api#1191 puts a Knora project ID in the IIIF URL, and stores each project's images in a different directory. We also want to use Sipi's subdir_levels feature inside each of these project directories. But Sipi only creates subdirectories on startup, which means that every time we add a new project, we have to restart Sipi. Could Sipi add the subdirectories on the fly?

Maybe there could be a function like helper.filename_hash, which just returned the hashed directory path, without the filename. Then there could be a function like server.fs.mkdir to create a directory and all of its parent directories if they don't exist. Then a Lua script could do something like this:

project_dir = config.imgroot .. '/' .. project_id
success, hash_path = helper.filename_hash_path(filename)
hash_path_in_project_dir = project_dir .. '/' .. hash_path
server.fs.mkdirs(hash_path_in_project_dir)
file_path = hash_path_in_project_dir .. '/' .. filename
success, error_msg = uploaded_image:write(file_path)

[benjamingeer]

After discussion with @lrosenth and @subotic: the directories will be created at startup, but there will also be a new Sipi admin route for adding a new project directory.