[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_block.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::mac::ScopedBlock<AppIconURLProvider> _appIconURLProvider;
+}
+
++ (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) {
+    // TODO(ios): iOS code should default to "Chromium" branding.
+    // http://crbug.com/489270
+    _appIconURLProvider.reset(^(int width, int height) {
+      return [NSString
+          stringWithFormat:@"https://%@/Icon-%dx%d-%dx.png",
+                           @"ssl.gstatic.com/ios-apps/com.google.chrome.ios",
+                           width, height,
+                           [[UIScreen mainScreen] scale] == 1.0 ? 1 : 2];
+    }, base::scoped_policy::RETAIN);
+  }
+  return _appIconURLProvider.get()(width, height);
+}
+
+- (void)setCallbackSchemeForTesting:(NSString*)scheme {
+  _callbackScheme.reset([scheme copy]);
+}
+
+- (void)setAppIconURLProviderForTesting:(AppIconURLProvider)block {
+  _appIconURLProvider.reset(block, base::scoped_policy::RETAIN);
+}
+
+@end