Make a reaction to alter the JSON-LD

[whikloj]

GitHub Issue: Islandora/documentation#768

What does this Pull Request do?

Adds a hook to alter the normalized jsonld array before we encode it as JSON.

What's new?

hook_jsonld_alter_normalized_array(EntityInterface $entity, array &$normalized, array $context)

• Does this change require documentation to be updated? no
• Does this change add any new dependencies? no
• Does this change require any other modifications to be made to the repository
  (ie. Regeneration activity, etc.)? no
• Could this change impact execution of existing code? no

How should this be tested?

There is a test in here and I will also test it with a reaction in Islandora soon.

Interested parties

@dannylamb @mjordan

[dannylamb]

Another option to consider if you want to re-use the existing ContextProviders without messing with dependencies would be to fire a hook/alter from this module, and implement the hook/alter in islandora. There you can create your ContextProviders and execute your reactions. It would decouple jsonld from the context module and would be more mainstream Drupal-y.

Better than a submodule just to hold a handful of classes. 🤷‍♂️

But I'm fine with it for now. It's always something we can address later. You're definitely on the right path. I've checked out the PRs and am 👍 I'll try pulling them in and giving them a whirl.

[whikloj]

@dannylamb Some of these changes were because of the use of deprecated classes (EntityManager) and functions (drupal_basename) which is scheduled to be deprecated in 9. I figured I'd fix them up now so they don't get forgotten about.

[dannylamb]

Just tested in tandem with the Islandora PR