Vastly improved new character UX

Characters now can limit which libraries they allow

app/imports/api/library/getCreatureLibraryIds.js

@@ -0,0 +1,39 @@
+import LibraryCollections from '/imports/api/library/LibraryCollections.js';
+import Creatures from '/imports/api/creature/creatures/Creatures.js';
+import getUserLibraryIds from './getUserLibraryIds';
+import { intersection, union } from 'lodash';
+
+export default function getCreatureLibraryIds(creature, userId) {
+  if (!userId) return [];
+
+  // Get the ids of libraries the user is permitted to view
+  const userLibIds = getUserLibraryIds(userId);
+
+  // If given a creature Id, get the creature document
+  if (typeof creature === 'string') {
+    creature = Creatures.findOne(creature, {
+      fields: {
+        allowedLibraries: 1,
+        allowedLibraryCollections: 1,
+      }
+    });
+    if (!creature) return [];
+  }
+
+  // If the creature does not restrict the libraries, let it use them all
+  if (!creature.allowedLibraryCollections && !creature.allowedLibraries) {
+    return userLibIds;
+  }
+  
+  // Get the ids of the libraries that the creature allows
+  const allowedCollections = creature.allowedLibraryCollections || [];
+  let creatureLibIds = creature.allowedLibraries || [];
+  LibraryCollections.find({
+    _id: { $in: allowedCollections }
+  }, { fields: { libraries: 1 } }).forEach(collection => {
+    creatureLibIds = union(creatureLibIds, collection.libraries);
+  });
+
+  // return all the ids that the creature allows and the user can view
+  return intersection(userLibIds, creatureLibIds);
+}