Implement access control on nodes and media using taxonomies

[mjordan]

Title (Goal)	Implement access control on nodes and media using taxonomies
Primary Actor	Repository admin
Scope	Specific service
Level	High
Story	As a repository admin, I want to restrict access to Islandora content using taxonomies. For example, nodes and media tagged with "foo" can only be viewed by users with the role "fooviewers" and only managed by users with the role "foomanagers."

[mjordan]

This use case applies more to Drupal than to Islandora. Related issue: #823. https://www.drupal.org/project/permissions_by_term appears to provide this functionality but we need to confirm that it does with some hands-on tests.

[rosiel]

I think this would fix #412 - if media (files) can be restricted independently of their metadata - especially if the file (payload) can be restricted independently of the file-specific metadata (file size, file type, other FITS-like characteristics that may be on the "media" object not the node representing the conceptual object).

[dannylamb]

We can (and are) doing this with islandora_demo, though there is nothing tied to it and you are free to use organic groups or whatever else you want :D