fix($routeProvider): do not deep-copy route definition objects

Deep-copying route definition objects can break specific custom implementations of `$sce` (used to
trust a `templateUrl` as RESOURCE_URL). The purpose of copying route definition objects was to guard
against the user's modifying the route definition object after route registration, while still
capturing inherited properties.
As suggested by @IgorMinar in angular#14699 (comment),
we can achieve both _and_ support custom `$sce` implementations, by shallow-copying instead.

This is an alternative implementation for angular#14699, which avoids the breaking change.

Fixes angular#14478
Closes angular#14699

Closes angular#14750

angularFiles.js

@@ -5,6 +5,7 @@ var angularFiles = {
     'src/minErr.js',
     'src/Angular.js',
     'src/loader.js',
+    'src/shallowCopy.js',
     'src/stringify.js',
     'src/AngularPublic.js',
     'src/jqLite.js',
@@ -128,6 +129,7 @@ var angularFiles = {
       'src/ngResource/resource.js'
     ],
     'ngRoute': [
+      'src/shallowCopy.js',
       'src/ngRoute/route.js',
       'src/ngRoute/routeParams.js',
       'src/ngRoute/directive/ngView.js'

src/Angular.js

@@ -57,7 +57,6 @@
   includes: true,
   arrayRemove: true,
   copy: true,
-  shallowCopy: true,
   equals: true,
   csp: true,
   jq: true,
@@ -933,31 +932,6 @@ function copy(source, destination) {
   }
 }
 
-/**
- * Creates a shallow copy of an object, an array or a primitive.
- *
- * Assumes that there are no proto properties for objects.
- */
-function shallowCopy(src, dst) {
-  if (isArray(src)) {
-    dst = dst || [];
-
-    for (var i = 0, ii = src.length; i < ii; i++) {
-      dst[i] = src[i];
-    }
-  } else if (isObject(src)) {
-    dst = dst || {};
-
-    for (var key in src) {
-      if (!(key.charAt(0) === '$' && key.charAt(1) === '$')) {
-        dst[key] = src[key];
-      }
-    }
-  }
-
-  return dst || src;
-}
-
 
 /**
  * @ngdoc function

src/ngRoute/route.js

@@ -1,5 +1,11 @@
 'use strict';
 
+/* global shallowCopy: false */
+
+// There are necessary for `shallowCopy()` (included via `src/shallowCopy.js`)
+var isArray = angular.isArray;
+var isObject = angular.isObject;
+
 /**
  * @ngdoc module
  * @name ngRoute
@@ -160,7 +166,7 @@ function $RouteProvider() {
    */
   this.when = function(path, route) {
     //copy original route object to preserve params inherited from proto chain
-    var routeCopy = angular.copy(route);
+    var routeCopy = shallowCopy(route);
     if (angular.isUndefined(routeCopy.reloadOnSearch)) {
       routeCopy.reloadOnSearch = true;
     }

src/shallowCopy.js

@@ -0,0 +1,28 @@
+'use strict';
+
+/* global shallowCopy: true */
+
+/**
+ * Creates a shallow copy of an object, an array or a primitive.
+ *
+ * Assumes that there are no proto properties for objects.
+ */
+function shallowCopy(src, dst) {
+  if (isArray(src)) {
+    dst = dst || [];
+
+    for (var i = 0, ii = src.length; i < ii; i++) {
+      dst[i] = src[i];
+    }
+  } else if (isObject(src)) {
+    dst = dst || {};
+
+    for (var key in src) {
+      if (!(key.charAt(0) === '$' && key.charAt(1) === '$')) {
+        dst[key] = src[key];
+      }
+    }
+  }
+
+  return dst || src;
+}

src/stringify.js

@@ -1,6 +1,6 @@
 'use strict';
 
-/* global: toDebugString: true */
+/* global toDebugString: true */
 
 function serializeObject(obj) {
   var seen = [];

test/ngRoute/routeSpec.js

@@ -900,6 +900,87 @@ describe('$route', function() {
   });
 
 
+  it('should not get affected by modifying the route definition object after route registration',
+    function() {
+      module(function($routeProvider) {
+        var rdo = {};
+
+        rdo.templateUrl = 'foo.html';
+        $routeProvider.when('/foo', rdo);
+
+        rdo.templateUrl = 'bar.html';
+        $routeProvider.when('/bar', rdo);
+      });
+
+      inject(function($location, $rootScope, $route) {
+        $location.path('/bar');
+        $rootScope.$digest();
+        expect($location.path()).toBe('/bar');
+        expect($route.current.templateUrl).toBe('bar.html');
+
+        $location.path('/foo');
+        $rootScope.$digest();
+        expect($location.path()).toBe('/foo');
+        expect($route.current.templateUrl).toBe('foo.html');
+      });
+    }
+  );
+
+
+  it('should use the property values of the passed in route definition object directly',
+    function() {
+      var $routeProvider;
+
+      module(function(_$routeProvider_) {
+        $routeProvider = _$routeProvider_;
+      });
+
+      inject(function($location, $rootScope, $route, $sce) {
+        var sceWrappedUrl = $sce.trustAsResourceUrl('foo.html');
+        $routeProvider.when('/foo', {templateUrl: sceWrappedUrl});
+
+        $location.path('/foo');
+        $rootScope.$digest();
+        expect($location.path()).toBe('/foo');
+        expect($route.current.templateUrl).toBe(sceWrappedUrl);
+      });
+    }
+  );
+
+
+  it('should support custom `$sce` implementations', function() {
+    function MySafeResourceUrl(val) {
+      var self = this;
+      this._val = val;
+      this.getVal = function() {
+        return (this !== self) ? null : this._val;
+      };
+    }
+
+    var $routeProvider;
+
+    module(function($provide, _$routeProvider_) {
+      $routeProvider = _$routeProvider_;
+
+      $provide.decorator('$sce', function($delegate) {
+        $delegate.trustAsResourceUrl = function(url) { return new MySafeResourceUrl(url); };
+        $delegate.getTrustedResourceUrl = function(v) { return v.getVal(); };
+        $delegate.valueOf = function(v) { return v.getVal(); };
+        return $delegate;
+      });
+    });
+
+    inject(function($location, $rootScope, $route, $sce) {
+      $routeProvider.when('/foo', {templateUrl: $sce.trustAsResourceUrl('foo.html')});
+
+      $location.path('/foo');
+      $rootScope.$digest();
+      expect($location.path()).toBe('/foo');
+      expect($sce.valueOf($route.current.templateUrl)).toBe('foo.html');
+    });
+  });
+
+
   describe('redirection', function() {
     it('should support redirection via redirectTo property by updating $location', function() {
       module(function($routeProvider) {