[iOS] Upstream URL utilities

ios/chrome/browser/chrome_url_util.mm

+// Copyright 2012 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/chrome/browser/chrome_url_util.h"
+
+#import <UIKit/UIKit.h>
+
+#include "base/logging.h"
+#include "base/mac/scoped_nsobject.h"
+#include "base/strings/string_util.h"
+#include "base/strings/sys_string_conversions.h"
+#include "ios/chrome/browser/chrome_url_constants.h"
+#import "ios/net/url_scheme_util.h"
+#include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
+#include "url/gurl.h"
+
+bool UrlIsExternalFileReference(const GURL& url) {
+  return url.SchemeIs(ios::GetChromeBrowserProvider()->GetChromeUIScheme()) &&
+         LowerCaseEqualsASCII(url.host(), kChromeUIExternalFileHost);
+}
+
+NSURL* UrlToLaunchChrome() {
+  // Determines the target URL scheme that will launch Chrome.
+  NSString* scheme = [[ChromeAppConstants sharedInstance] getBundleURLScheme];
+  return [NSURL URLWithString:[NSString stringWithFormat:@"%@://", scheme]];
+}
+
+NSURL* UrlOfChromeAppIcon(int width, int height) {
+  NSString* url =
+      [[ChromeAppConstants sharedInstance] getChromeAppIconURLOfWidth:width
+                                                               height:height];
+  return [NSURL URLWithString:url];
+}
+
+bool UrlHasChromeScheme(const GURL& url) {
+  return url.SchemeIs(ios::GetChromeBrowserProvider()->GetChromeUIScheme());
+}
+
+bool UrlHasChromeScheme(NSURL* url) {
+  return net::UrlSchemeIs(
+      url, base::SysUTF8ToNSString(
+               ios::GetChromeBrowserProvider()->GetChromeUIScheme()));
+}
+
+@implementation ChromeAppConstants {
+  base::scoped_nsobject<NSString> callbackScheme_;
+  base::scoped_nsprotocol<AppIconURLProvider> appIconURLProvider_;

[rohitrao (ping after 24h), 2015/05/18 13:34:56]

Want to switch to leading underscores for these variables?

[sdefresne, 2015/05/18 14:19:54]

Done and changed the block to use base::mac::ScopedBlock.

+}
+
++ (ChromeAppConstants*)sharedInstance {
+  static ChromeAppConstants* g_instance = [[ChromeAppConstants alloc] init];
+  return g_instance;
+}
+
+- (NSString*)getBundleURLScheme {
+  if (!callbackScheme_) {
+    NSSet* allowableSchemes =
+        [NSSet setWithObjects:@"googlechrome", @"chromium", nil];
+    NSDictionary* info = [[NSBundle mainBundle] infoDictionary];
+    NSArray* urlTypes = [info objectForKey:@"CFBundleURLTypes"];
+    for (NSDictionary* urlType in urlTypes) {
+      DCHECK([urlType isKindOfClass:[NSDictionary class]]);
+      NSArray* schemes = [urlType objectForKey:@"CFBundleURLSchemes"];
+      if (!schemes)
+        continue;
+      DCHECK([schemes isKindOfClass:[NSArray class]]);
+      for (NSString* scheme in schemes) {
+        if ([allowableSchemes containsObject:scheme])
+          callbackScheme_.reset([scheme copy]);
+      }
+    }
+  }
+  DCHECK([callbackScheme_ length]);
+  return callbackScheme_;
+}
+
+- (NSString*)getChromeAppIconURLOfWidth:(int)width height:(int)height {
+  if (!appIconURLProvider_) {
+    appIconURLProvider_.reset([^(int width, int height) {
+      return [NSString
+          stringWithFormat:@"https://%@/Icon-%dx%d-%dx.png",
+                           @"ssl.gstatic.com/ios-apps/com.google.chrome.ios",

[rohitrao (ping after 24h), 2015/05/18 13:34:56]

We should consider debranding this.

[sdefresne, 2015/05/18 14:19:54]

Added a TODO.

+                           width, height,
+                           [[UIScreen mainScreen] scale] == 1.0 ? 1 : 2];
+    } copy]);
+  }
+  return appIconURLProvider_.get()(width, height);
+}
+
+- (void)setCallbackSchemeForTesting:(NSString*)scheme {
+  callbackScheme_.reset([scheme copy]);
+}
+
+- (void)setAppIconURLProviderForTesting:(AppIconURLProvider)block {
+  appIconURLProvider_.reset([block copy]);
+}
+
+@end