OpenInChromeController.m

#if !defined(__has_feature) || !__has_feature(objc_arc)
#error "This file requires ARC support."
#endif

// Copyright 2012-2014, Google Inc.
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//
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#import <UIKit/UIKit.h>

#import "OpenInChromeController.h"

static NSString * const kGoogleChromeHTTPScheme = @"googlechrome:";
static NSString * const kGoogleChromeHTTPSScheme = @"googlechromes:";

@implementation OpenInChromeController

+ (OpenInChromeController *)sharedInstance {
  static OpenInChromeController *sharedInstance;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    sharedInstance = [[self alloc] init];
  });
  return sharedInstance;
}

- (BOOL)isChromeInstalled {
  NSURL *simpleURL = [NSURL URLWithString:kGoogleChromeHTTPScheme];
  return [[UIApplication sharedApplication] canOpenURL:simpleURL];
}

- (BOOL)openInChrome:(NSURL *)url {
  if ([self isChromeInstalled]) {
    NSString *scheme = [url.scheme lowercaseString];
    // Replace the URL Scheme with the Chrome equivalent.
    NSString *chromeScheme = nil;
    if ([scheme isEqualToString:@"http"]) {
      chromeScheme = kGoogleChromeHTTPScheme;
    } else if ([scheme isEqualToString:@"https"]) {
      chromeScheme = kGoogleChromeHTTPSScheme;
    }

    // Proceed only if a valid Google Chrome URI Scheme is available.
    if (chromeScheme) {
      NSString *absoluteString = [url absoluteString];
      NSRange rangeForScheme = [absoluteString rangeOfString:@":"];
      NSString *urlNoScheme =
          [absoluteString substringFromIndex:rangeForScheme.location + 1];
      NSString *chromeURLString =
          [chromeScheme stringByAppendingString:urlNoScheme];
      NSURL *chromeURL = [NSURL URLWithString:chromeURLString];
      // Open the URL with Google Chrome.
      return [[UIApplication sharedApplication] openURL:chromeURL];
    }
  }
  return NO;
}

- (BOOL)openInChrome:(NSURL *)url
     withCallbackURL:(NSURL *)callbackURL
        createNewTab:(BOOL)createNewTab {
  // This deprecated API simply calls the supported -openInChrome: API.
  return [self openInChrome:url];
}
@end