Merge pull request #5892 from AnalyticalGraphicsInc/local-resources

Allow local-running Cesium to load its resources

Author: mramato

CHANGES.md

@@ -2,6 +2,7 @@ Change Log
 ==========
 ### 1.39 - 2017-11-01
 
+* Added the ability to load Cesium's assets from the local file system if security permissions allow it. [#5830](https://github.com/AnalyticalGraphicsInc/cesium/issues/5830)
 * Added function that inserts missing namespace declarations into KML files. [#5860](https://github.com/AnalyticalGraphicsInc/cesium/pull/5860)
 * Added support for the layer.json `parentUrl` property in `CesiumTerrainProvider` to allow for compositing of tilesets.
 * Fixed a bug that caused KML ground overlays to appear distorted when rotation was applied. [#5914](https://github.com/AnalyticalGraphicsInc/cesium/issues/5914)

Source/Core/loadWithXhr.js

@@ -172,8 +172,14 @@ define([
             xhr.responseType = responseType;
         }
 
+        // While non-standard, file protocol always returns a status of 0 on success
+        var localFile = false;
+        if (typeof url === 'string') {
+            localFile = url.indexOf('file://') === 0;
+        }
+
         xhr.onload = function() {
-            if (xhr.status < 200 || xhr.status >= 300) {
+            if ((xhr.status < 200 || xhr.status >= 300) && !(localFile && xhr.status === 0)) {
                 deferred.reject(new RequestErrorEvent(xhr.status, xhr.response, xhr.getAllResponseHeaders()));
                 return;
             }