Better publication and count of active fires in current map

imports/modules/server/other-checks.js

@@ -0,0 +1,25 @@
+import { check, Match } from 'meteor/check';
+
+export const validZoom = Match.Where((zoom) => {
+  // http://wiki.openstreetmap.org/wiki/Zoom_levels
+  check(zoom, Number);
+  return zoom >= 0 && zoom <= 19;
+});
+
+// https://github.com/3stack-software/meteor-match-library
+export function NumberBetween(min, max) {
+  return Match.Where((x) => {
+    check(x, Number);
+    return min <= x && x <= max;
+  });
+}
+
+export function NullOr(type) {
+  return Match.Where((x) => {
+    if (x === null) {
+      return true;
+    }
+    check(x, type);
+    return true;
+  });
+}