fix($browser): normalize inputted URLs

Calls to `$browser.url` now normalize the inputted URL ensuring multiple
calls only differing in formatting do not force a browser `pushState`.

Normalization is done the same as the browser location URL and may
differ per browser and may be changed by browsers. Today no browsers
fully normalize URLs so this does not fix all instances of this issue.

See #16100
Closes #16606

src/ng/browser.js

@@ -108,6 +108,9 @@ function Browser(window, document, $log, $sniffer, $$taskTrackerFactory) {
     if (url) {
       var sameState = lastHistoryState === state;
 
+      // Normalize the inputted URL
+      url = urlResolve(url).href;
+
       // Don't change anything if previous and current URLs and states match. This also prevents
       // IE<10 from getting into redirect loop when in LocationHashbangInHtml5Url mode.
       // See https://github.com/angular/angular.js/commit/ffb2701

test/ng/browserSpecs.js

@@ -418,7 +418,7 @@ describe('browser', function() {
       browser.url('http://new.org');
 
       expect(pushState).toHaveBeenCalledOnce();
-      expect(pushState.calls.argsFor(0)[2]).toEqual('http://new.org');
+      expect(pushState.calls.argsFor(0)[2]).toEqual('http://new.org/');
 
       expect(replaceState).not.toHaveBeenCalled();
       expect(locationReplace).not.toHaveBeenCalled();
@@ -430,7 +430,7 @@ describe('browser', function() {
       browser.url('http://new.org', true);
 
       expect(replaceState).toHaveBeenCalledOnce();
-      expect(replaceState.calls.argsFor(0)[2]).toEqual('http://new.org');
+      expect(replaceState.calls.argsFor(0)[2]).toEqual('http://new.org/');
 
       expect(pushState).not.toHaveBeenCalled();
       expect(locationReplace).not.toHaveBeenCalled();
@@ -474,7 +474,7 @@ describe('browser', function() {
       sniffer.history = false;
       browser.url('http://new.org', true);
 
-      expect(locationReplace).toHaveBeenCalledWith('http://new.org');
+      expect(locationReplace).toHaveBeenCalledWith('http://new.org/');
 
       expect(pushState).not.toHaveBeenCalled();
       expect(replaceState).not.toHaveBeenCalled();
@@ -689,6 +689,73 @@ describe('browser', function() {
           expect(replaceState).not.toHaveBeenCalled();
           expect(locationReplace).not.toHaveBeenCalled();
         });
+
+        it('should not do pushState with a URL using relative protocol', function() {
+          browser.url('http://server/');
+
+          pushState.calls.reset();
+          replaceState.calls.reset();
+          locationReplace.calls.reset();
+
+          browser.url('//server');
+          expect(pushState).not.toHaveBeenCalled();
+          expect(replaceState).not.toHaveBeenCalled();
+          expect(locationReplace).not.toHaveBeenCalled();
+        });
+
+        it('should not do pushState with a URL only adding a trailing slash after domain', function() {
+          // A domain without a trailing /
+          browser.url('http://server');
+
+          pushState.calls.reset();
+          replaceState.calls.reset();
+          locationReplace.calls.reset();
+
+          // A domain from something such as window.location.href with a trailing slash
+          browser.url('http://server/');
+          expect(pushState).not.toHaveBeenCalled();
+          expect(replaceState).not.toHaveBeenCalled();
+          expect(locationReplace).not.toHaveBeenCalled();
+        });
+
+        it('should not do pushState with a URL only removing a trailing slash after domain', function() {
+          // A domain from something such as window.location.href with a trailing slash
+          browser.url('http://server/');
+
+          pushState.calls.reset();
+          replaceState.calls.reset();
+          locationReplace.calls.reset();
+
+          // A domain without a trailing /
+          browser.url('http://server');
+          expect(pushState).not.toHaveBeenCalled();
+          expect(replaceState).not.toHaveBeenCalled();
+          expect(locationReplace).not.toHaveBeenCalled();
+        });
+
+        it('should do pushState with a URL only adding a trailing slash after the path', function() {
+          browser.url('http://server/foo');
+
+          pushState.calls.reset();
+          replaceState.calls.reset();
+          locationReplace.calls.reset();
+
+          browser.url('http://server/foo/');
+          expect(pushState).toHaveBeenCalledOnce();
+          expect(fakeWindow.location.href).toEqual('http://server/foo/');
+        });
+
+        it('should do pushState with a URL only removing a trailing slash after the path', function() {
+          browser.url('http://server/foo/');
+
+          pushState.calls.reset();
+          replaceState.calls.reset();
+          locationReplace.calls.reset();
+
+          browser.url('http://server/foo');
+          expect(pushState).toHaveBeenCalledOnce();
+          expect(fakeWindow.location.href).toEqual('http://server/foo');
+        });
       };
     }
   });
@@ -1093,7 +1160,7 @@ describe('browser', function() {
     it('should not interfere with legacy browser url replace behavior', function() {
       inject(function($rootScope) {
         var current = fakeWindow.location.href;
-        var newUrl = 'notyet';
+        var newUrl = 'http://notyet/';
         sniffer.history = false;
         expect(historyEntriesLength).toBe(1);
         browser.url(newUrl, true);