Progress on file system UI

app/imports/api/users/methods/updateFileStorageUsed.js

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+import { ValidatedMethod } from 'meteor/mdg:validated-method';
+import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
+import ArchiveCreatureFiles from '/imports/api/creature/archive/ArchiveCreatureFiles.js';
+import UserImages from '/imports/api/files/UserImages.js';
+const fileCollections = [ArchiveCreatureFiles, UserImages];
+
+const updateFileStorageUsed = new ValidatedMethod({
+  name: 'users.recalculateFileStorageUsed',
+  validate: null,
+  mixins: [RateLimiterMixin],
+  rateLimit: {
+    numRequests: 5,
+    timeInterval: 5000,
+  },
+  run() {
+    const userId = Meteor.userId();
+    if (!userId) throw new Meteor.Error('No user',
+      'You must be logged in to recalculate your file use');
+    const user = Meteor.users.findOne(userId);
+    if (!user) {
+      throw new Meteor.Error('noUser', 'User not found');
+    }
+    updateFileStorageUsedWork(userId);
+  }
+});
+
+export default updateFileStorageUsed;
+
+export function updateFileStorageUsedWork(userId) {
+  if (!userId) {
+    throw new Meteor.Error('idRequired',
+    'No user ID was provided to update file storage used')
+  }
+
+  let sum = 0;
+  fileCollections.forEach(collection => {
+    collection.find({ userId }, { fields: { size: 1 } }).forEach(file => {
+      sum += file.size;
+    });
+  });
+
+  Meteor.users.update(userId, {
+    $set: {
+      fileStorageUsed: sum,
+    }
+  });
+}
+
+export function incrementFileStorageUsed(userId, amount) {
+  if (!userId) {
+    throw new Meteor.Error('idRequired',
+      'No user ID was provided to update file storage used')
+  }
+  
+  const user = Meteor.users.findOne(userId);
+  if (!user) {
+    throw new Meteor.Error('noUser', 'User not found');
+  }
+
+  if (user.fileStorageUsed === undefined) {
+    // The user doesn't have a current value for storage used, calculate it
+    // from scratch
+    updateFileStorageUsedWork(userId);
+  } else {
+    Meteor.users.update(userId, {
+      $inc: {
+        fileStorageUsed: amount,
+      }
+    });
+  }
+}