Verify min and max longitude and latitude

Otherwise this can potentially lead to a fairly weird Elasticsearch error mentioned in https://github.com/pelias/pelias/issues/656

sanitizer/_geo_common.js

@@ -39,6 +39,18 @@ function sanitize_rect( key_prefix, clean, raw, bbox_is_required ) {
   properties.forEach(function(prop) {
     sanitize_coord(prop, clean, raw, true);
   });
+
+  var min_lat = parseFloat( raw[key_prefix + '.' + 'min_lat'] );
+  var max_lat = parseFloat( raw[key_prefix + '.' + 'max_lat'] );
+  if (min_lat > max_lat) {
+    throw new Error( util.format( 'min_lat is larger than max_lat in \'%s\'', key_prefix ) );
+  }
+
+  var min_lon = parseFloat( raw[key_prefix + '.' + 'min_lon'] );
+  var max_lon = parseFloat( raw[key_prefix + '.' + 'max_lon'] );
+  if (min_lon > max_lon) {
+    throw new Error( util.format( 'min_lon is larger than max_lon in \'%s\'', key_prefix ) );
+  }
 }
 
 /**

test/unit/sanitizer/_geo_common.js

@@ -216,8 +216,8 @@ module.exports.tests.rect = function(test, common) {
   test('valid rect quad', function (t) {
     var clean = {};
     var params = {
-      'boundary.rect.min_lat': -40.659,
+      'boundary.rect.min_lat': -41.614,
-      'boundary.rect.max_lat': -41.614,
+      'boundary.rect.max_lat': -40.659,
       'boundary.rect.min_lon': 174.612,
       'boundary.rect.max_lon': 176.333
     };
@@ -283,6 +283,21 @@ module.exports.tests.rect = function(test, common) {
     t.end();
   });
 
+  test('invalid rect - max/min switched', function (t) {
+    var clean = {};
+    var params = {
+      'boundary.rect.max_lat': 52.2387,
+      'boundary.rect.max_lon': 14.1367,
+      'boundary.rect.min_lat': 52.7945,
+      'boundary.rect.min_lon': 12.6398
+    };
+    var mandatory = false;
+
+    t.throws( function() {
+      sanitize.sanitize_rect( 'boundary.rect', clean, params, mandatory );
+    });
+    t.end();
+  });
 };
 
 module.exports.tests.circle = function(test, common) {