min/max lat/lon to form bbox from the input params

sanitiser/_geo.js

@@ -46,22 +46,23 @@ function sanitize( req ){
   }
 
   // bbox 
+  // bbox = bottom_left lat, bottom_left lon, top_right lat, top_right lon
+  // bbox = left,bottom,right,top
+  // bbox = min Longitude , min Latitude , max Longitude , max Latitude 
   if (params.bbox) {
     var bbox = [];
     var bboxArr = params.bbox.split(',');
-    if( Array.isArray(bboxArr) && bboxArr.length === 4 ){
-      bboxArr.forEach(function(latlon, index) {
+    if( Array.isArray(bboxArr) && bboxArr.length === 4 ) {
+      bbox = bboxArr.filter(function(latlon, index) {
         latlon = parseFloat(latlon, 10);
-        if ( !(index % 2 === 0 ? is_invalid_lat(latlon) : is_invalid_lon(latlon)) ) {
-          bbox.push(latlon);
-        }
+        return !(index % 2 === 0 ? is_invalid_lat(latlon) : is_invalid_lon(latlon)); 
       });
       if (bbox.length === 4) {
         clean.bbox = {
-          top   : bbox[0],
-          right : bbox[1],
-          bottom: bbox[2],
-          left  : bbox[3]
+          top   : Math.max(bbox[0], bbox[2]),
+          right : Math.max(bbox[1], bbox[3]),
+          bottom: Math.min(bbox[0], bbox[2]),
+          left  : Math.min(bbox[1], bbox[3])
         };
       } else {
         return {

test/unit/sanitiser/suggest.js

@@ -143,7 +143,7 @@ module.exports.tests.sanitize_bbox = function(test, common) {
       sanitize({ input: 'test', lat: 0, lon: 0, bbox: bbox }, function( err, clean ){
         var expected = JSON.parse(JSON.stringify( defaultClean ));
         t.equal(err, undefined, 'no error');
-        t.deepEqual(clean, expected, 'clean set correctly');
+        t.deepEqual(clean, expected, 'falling back on 50km distance from centroid');
       });
     });
     t.end();
@@ -156,10 +156,10 @@ module.exports.tests.sanitize_bbox = function(test, common) {
           return parseInt(i);
         });
         expected.bbox = {
-          top   : bboxArray[0],
-          right : bboxArray[1],
-          bottom: bboxArray[2],
-          left  : bboxArray[3]
+          top   : Math.max(bboxArray[0], bboxArray[2]),
+          right : Math.max(bboxArray[1], bboxArray[3]),
+          bottom: Math.min(bboxArray[0], bboxArray[2]),
+          left  : Math.min(bboxArray[1], bboxArray[3])
         };
         t.equal(err, undefined, 'no error');
         t.deepEqual(clean, expected, 'clean set correctly (' + bbox + ')');