Upstream the iOS web_shell and supporting code

ios/web/shell/view_controller.mm

Index: ios/web/shell/view_controller.mm
diff --git a/ios/web/shell/view_controller.mm b/ios/web/shell/view_controller.mm
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "ios/web/shell/view_controller.h"
+
+#include "base/mac/objc_property_releaser.h"
+#import "base/mac/scoped_nsobject.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/sys_string_conversions.h"
+#include "ios/net/cookies/cookie_store_ios.h"
+#import "ios/net/crn_http_protocol_handler.h"
+#import "ios/web/navigation/crw_session_controller.h"
+#include "ios/web/navigation/web_load_params.h"
+#import "ios/web/net/crw_url_verifying_protocol_handler.h"
+#include "ios/web/net/request_tracker_factory_impl.h"
+#import "ios/web/net/web_http_protocol_handler_delegate.h"
+#include "ios/web/public/referrer.h"
+#import "ios/web/public/web_controller_factory.h"
+#include "ios/web/public/web_state/web_state.h"
+#include "ios/web/public/web_view_util.h"
+#include "ios/web/shell/shell_browser_state.h"
+#include "ios/web/web_state/ui/crw_web_controller.h"
+#include "ios/web/web_state/web_state_impl.h"
+#include "ui/base/page_transition_types.h"
+
+namespace {
+// Returns true if WKWebView should be used instead of UIWebView.
+// TODO(stuartmorgan): Decide on a better way to control this.
+bool UseWKWebView() {
+#if defined(FORCE_ENABLE_WKWEBVIEW)
+  return web::IsWKWebViewSupported();
+#else
+  return false;
+#endif
+}
+}
+
+@interface ViewController () {
+  web::BrowserState* _browserState;
+  base::scoped_nsobject<CRWWebController> _webController;
+  scoped_ptr<web::RequestTrackerFactoryImpl> _requestTrackerFactory;
+  scoped_ptr<web::WebHTTPProtocolHandlerDelegate> _httpProtocolDelegate;
+
+  base::mac::ObjCPropertyReleaser _propertyReleaser_ViewController;
+}
+@property(nonatomic, readwrite, retain) UITextField* field;
+@end
+
+@implementation ViewController
+
+@synthesize field = _field;
+@synthesize containerView = _containerView;
+@synthesize toolbarView = _toolbarView;
+
+- (instancetype)initWithBrowserState:(web::BrowserState*)browserState {
+  self = [super initWithNibName:@"MainView" bundle:nil];
+  if (self) {
+    _propertyReleaser_ViewController.Init(self, [ViewController class]);
+    _browserState = browserState;
+  }
+  return self;
+}
+
+- (void)dealloc {
+  net::HTTPProtocolHandlerDelegate::SetInstance(nullptr);
+  net::RequestTracker::SetRequestTrackerFactory(nullptr);
+  [super dealloc];
+}
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+
+  // Set up the toolbar buttons.
+  UIButton* back = [UIButton buttonWithType:UIButtonTypeCustom];
+  [back setImage:[UIImage imageNamed:@"toolbar_back"]
+        forState:UIControlStateNormal];
+  [back setFrame:CGRectMake(0, 0, 44, 44)];
+  [back setImageEdgeInsets:UIEdgeInsetsMake(5, 5, 4, 4)];
+  [back setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
+  [back addTarget:self
+                action:@selector(back)
+      forControlEvents:UIControlEventTouchUpInside];
+
+  UIButton* forward = [UIButton buttonWithType:UIButtonTypeCustom];
+  [forward setImage:[UIImage imageNamed:@"toolbar_forward"]
+           forState:UIControlStateNormal];
+  [forward setFrame:CGRectMake(44, 0, 44, 44)];
+  [forward setImageEdgeInsets:UIEdgeInsetsMake(5, 5, 4, 4)];
+  [forward setAutoresizingMask:UIViewAutoresizingFlexibleRightMargin];
+  [forward addTarget:self
+                action:@selector(forward)
+      forControlEvents:UIControlEventTouchUpInside];
+
+  base::scoped_nsobject<UITextField> field([[UITextField alloc]
+      initWithFrame:CGRectMake(88, 6, CGRectGetWidth([_toolbarView frame]) - 98,
+                               31)]);
+  [field setDelegate:self];
+  [field setBackground:[[UIImage imageNamed:@"textfield_background"]
+                           resizableImageWithCapInsets:UIEdgeInsetsMake(
+                                                           12, 12, 12, 12)]];
+  [field setAutoresizingMask:UIViewAutoresizingFlexibleWidth];
+  [field setKeyboardType:UIKeyboardTypeWebSearch];
+  [field setAutocorrectionType:UITextAutocorrectionTypeNo];
+  [field setClearButtonMode:UITextFieldViewModeWhileEditing];
+  self.field = field;
+
+  [_toolbarView addSubview:back];
+  [_toolbarView addSubview:forward];
+  [_toolbarView addSubview:field];
+
+  // Set up the network stack before creating the WebState.
+  [self setUpNetworkStack];
+
+  scoped_ptr<web::WebStateImpl> webState(new web::WebStateImpl(_browserState));
+  webState->GetNavigationManagerImpl().InitializeSession(nil, nil, NO, 0);
+  web::WebViewType webViewType =
+      UseWKWebView() ? web::WK_WEB_VIEW_TYPE : web::UI_WEB_VIEW_TYPE;
+  _webController.reset(web::CreateWebController(webViewType, webState.Pass()));
+  [_webController setDelegate:self];
+  [_webController setWebUsageEnabled:YES];
+
+  [[_webController view] setFrame:[_containerView bounds]];
+  [_containerView addSubview:[_webController view]];
+
+  web::WebLoadParams params(GURL("https://dev.chromium.org/"));
+  params.transition_type = ui::PAGE_TRANSITION_TYPED;
+  [_webController loadWithParams:params];
+}
+
+- (void)setUpNetworkStack {
+  // Disable the default cache.
+  [NSURLCache setSharedURLCache:nil];
+
+  _httpProtocolDelegate.reset(new web::WebHTTPProtocolHandlerDelegate(
+      _browserState->GetRequestContext()));
+  net::HTTPProtocolHandlerDelegate::SetInstance(_httpProtocolDelegate.get());
+  BOOL success = [NSURLProtocol registerClass:[CRNHTTPProtocolHandler class]];
+  DCHECK(success);
+  // The CRWURLVerifyingProtocolHandler is used to verify URL in the
+  // CRWWebController. It must be registered after the HttpProtocolHandler
+  // because handlers are called in the reverse order of declaration.
+  success =
+      [NSURLProtocol registerClass:[CRWURLVerifyingProtocolHandler class]];
+  DCHECK(success);
+  _requestTrackerFactory.reset(
+      new web::RequestTrackerFactoryImpl(std::string()));
+  net::RequestTracker::SetRequestTrackerFactory(_requestTrackerFactory.get());
+  net::CookieStoreIOS::SetCookiePolicy(net::CookieStoreIOS::ALLOW);
+}
+
+- (void)didReceiveMemoryWarning {
+  [super didReceiveMemoryWarning];
+}
+
+- (UIBarPosition)positionForBar:(id<UIBarPositioning>)bar {
+  if (bar == _toolbarView) {
+    return UIBarPositionTopAttached;
+  }
+  return UIBarPositionAny;
+}
+
+- (void)back {
+  if ([_webController canGoBack]) {
+    [_webController goBack];
+  }
+}
+
+- (void)forward {
+  if ([_webController canGoForward]) {
+    [_webController goForward];
+  }
+}
+
+- (BOOL)textFieldShouldReturn:(UITextField*)field {
+  GURL url = GURL(base::SysNSStringToUTF8([field text]));
+
+  // Do not try to load invalid URLs.
+  if (url.is_valid()) {
+    web::WebLoadParams params(url);
+    params.transition_type = ui::PAGE_TRANSITION_TYPED;
+    [_webController loadWithParams:params];
+  }
+
+  [field resignFirstResponder];
+  [self updateToolbar];
+  return YES;
+}
+
+- (void)updateToolbar {
+  // Do not update the URL if the text field is currently being edited.
+  if ([_field isFirstResponder]) {
+    return;
+  }
+
+  const GURL& url = [_webController webStateImpl]->GetVisibleURL();
+  [_field setText:base::SysUTF8ToNSString(url.spec())];
+}
+
+// -----------------------------------------------------------------------
+#pragma mark Bikeshedding Implementation
+
+// Overridden to allow this view controller to receive motion events by being
+// first responder when no other views are.
+- (BOOL)canBecomeFirstResponder {
+  return YES;
+}
+
+- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent*)event {
+  if (event.subtype == UIEventSubtypeMotionShake) {
+    [self updateToolbarColor];
+  }
+}
+
+- (void)updateToolbarColor {
+  // Cycle through the following set of colors:
+  NSArray* colors = @[
+    // Vanilla Blue.
+    [UIColor colorWithRed:0.337 green:0.467 blue:0.988 alpha:1.0],
+    // Vanilla Red.
+    [UIColor colorWithRed:0.898 green:0.110 blue:0.137 alpha:1.0],
+    // Blue Grey.
+    [UIColor colorWithRed:0.376 green:0.490 blue:0.545 alpha:1.0],
+    // Brown.
+    [UIColor colorWithRed:0.475 green:0.333 blue:0.282 alpha:1.0],
+    // Purple.
+    [UIColor colorWithRed:0.612 green:0.153 blue:0.690 alpha:1.0],
+    // Teal.
+    [UIColor colorWithRed:0.000 green:0.737 blue:0.831 alpha:1.0],
+    // Deep Orange.
+    [UIColor colorWithRed:1.000 green:0.341 blue:0.133 alpha:1.0],
+    // Indigo.
+    [UIColor colorWithRed:0.247 green:0.318 blue:0.710 alpha:1.0],
+    // Vanilla Green.
+    [UIColor colorWithRed:0.145 green:0.608 blue:0.141 alpha:1.0],
+    // Pinkerton.
+    [UIColor colorWithRed:0.914 green:0.118 blue:0.388 alpha:1.0],
+  ];
+
+  NSUInteger currentIndex = [colors indexOfObject:_toolbarView.barTintColor];
+  if (currentIndex == NSNotFound) {
+    currentIndex = 0;
+  }
+  NSUInteger newIndex = currentIndex + 1;
+  if (newIndex >= [colors count]) {
+    // TODO(rohitrao): Out of colors!  Consider prompting the user to pick their
+    // own color here.  Also consider allowing the user to choose the entire set
+    // of colors or allowing the user to choose color randomization.
+    newIndex = 0;
+  }
+  _toolbarView.barTintColor = [colors objectAtIndex:newIndex];
+}
+
+// -----------------------------------------------------------------------
+// WebDelegate implementation.
+
+- (void)webWillAddPendingURL:(const GURL&)url
+                  transition:(ui::PageTransition)transition {
+}
+- (void)webDidAddPendingURL {
+  [self updateToolbar];
+}
+- (void)webCancelStartLoadingRequest {
+}
+- (void)webDidStartLoadingURL:(const GURL&)currentUrl
+          shouldUpdateHistory:(BOOL)updateHistory {
+  [self updateToolbar];
+}
+- (void)webDidFinishWithURL:(const GURL&)url loadSuccess:(BOOL)loadSuccess {
+  [self updateToolbar];
+}
+
+- (CRWWebController*)webPageOrderedOpen:(const GURL&)url
+                               referrer:(const web::Referrer&)referrer
+                             windowName:(NSString*)windowName
+                           inBackground:(BOOL)inBackground {
+  return nil;
+}
+
+- (CRWWebController*)webPageOrderedOpenBlankWithReferrer:
+                         (const web::Referrer&)referrer
+                                            inBackground:(BOOL)inBackground {
+  return nil;
+}
+
+- (void)webPageOrderedClose {
+}
+- (void)goDelta:(int)delta {
+}
+- (void)openURLWithParams:(const web::WebState::OpenURLParams&)params {
+}
+- (BOOL)openExternalURL:(const GURL&)url {
+  return NO;
+}
+- (void)presentSSLError:(const net::SSLInfo&)info
+           forSSLStatus:(const web::SSLStatus&)status
+            recoverable:(BOOL)recoverable
+               callback:(SSLErrorCallback)shouldContinue {
+}
+- (void)presentSpoofingError {
+}
+- (void)webLoadCancelled:(const GURL&)url {
+}
+- (void)webDidUpdateHistoryStateWithPageURL:(const GURL&)pageUrl {
+}
+- (void)webController:(CRWWebController*)webController
+    retrievePlaceholderOverlayImage:(void (^)(UIImage*))block {
+}
+- (void)webController:(CRWWebController*)webController
+    onFormResubmissionForRequest:(NSURLRequest*)request
+                   continueBlock:(ProceduralBlock)continueBlock
+                     cancelBlock:(ProceduralBlock)cancelBlock {
+}
+- (void)webWillReload {
+}
+- (void)webWillInitiateLoadWithParams:(web::WebLoadParams&)params {
+}
+- (void)webDidUpdateSessionForLoadWithParams:(const web::WebLoadParams&)params
+                        wasInitialNavigation:(BOOL)initialNavigation {
+}
+- (void)webWillFinishHistoryNavigationFromEntry:(CRWSessionEntry*)fromEntry {
+}
+- (void)webWillGoDelta:(int)delta {
+}
+- (void)webDidPrepareForGoBack {
+}
+- (int)downloadImageAtUrl:(const GURL&)url
+            maxBitmapSize:(uint32_t)maxBitmapSize
+                 callback:
+                     (const web::WebState::ImageDownloadCallback&)callback {
+  return -1;
+}
+
+@end