External protocol dialog support for the Mac....

chrome/browser/cocoa/external_protocol_dialog.mm

+// Copyright (c) 2009 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 "chrome/browser/cocoa/external_protocol_dialog.h"
+
+#include "app/l10n_util_mac.h"
+#include "base/message_loop.h"
+#include "base/sys_string_conversions.h"
+#include "chrome/browser/external_protocol_handler.h"
+#include "grit/chromium_strings.h"
+#include "grit/generated_resources.h"
+
+///////////////////////////////////////////////////////////////////////////////
+// ExternalProtocolHandler
+
+// static
+void ExternalProtocolHandler::RunExternalProtocolDialog(
+    const GURL& url, int render_process_host_id, int routing_id) {
+  [[ExternalProtocolDialogController alloc] initWithGURL:&url];
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// ExternalProtocolDialogController
+
+@interface ExternalProtocolDialogController(Private)
+- (void)alertEnded:(NSAlert *)alert
+        returnCode:(int)returnCode
+       contextInfo:(void*)contextInfo;
+- (string16)appNameForProtocol;
+@end
+
+@implementation ExternalProtocolDialogController
+- (id)initWithGURL:(const GURL*)url {
+  DCHECK_EQ(MessageLoop::TYPE_UI, MessageLoop::current()->type());
+
+  url_ = *url;
+  creation_time_ = base::Time::Now();
+
+  string16 appName = [self appNameForProtocol];
+  if (appName.length() == 0) {
+    // No registered apps for this protocol; give up and go home.
+    [self autorelease];
+    return nil;
+  }
+
+  alert_ = [[NSAlert alloc] init];
+
+  [alert_ setMessageText:
+      l10n_util::GetNSStringWithFixup(IDS_EXTERNAL_PROTOCOL_TITLE)];
+
+  NSButton* allowButton = [alert_ addButtonWithTitle:
+      l10n_util::GetNSStringWithFixup(IDS_EXTERNAL_PROTOCOL_OK_BUTTON_TEXT)];
+  [allowButton setKeyEquivalent:@""];  // disallow as default
+  [alert_ addButtonWithTitle:
+      l10n_util::GetNSStringWithFixup(IDS_CANCEL)];
+
+  NSString* urlString = l10n_util::GetNSStringFWithFixup(
+      IDS_EXTERNAL_PROTOCOL_INFORMATION,
+      ASCIIToUTF16(url_.scheme() + ":"),
+      ASCIIToUTF16(url_.possibly_invalid_spec()));
+  NSString* appString = l10n_util::GetNSStringFWithFixup(
+      IDS_EXTERNAL_PROTOCOL_APPLICATION_TO_LAUNCH,
+      appName);
+  NSString* warningString =
+      l10n_util::GetNSStringWithFixup(IDS_EXTERNAL_PROTOCOL_WARNING);
+  NSString* informativeText =
+      [NSString stringWithFormat:@"%@\n\n%@\n\n%@",
+                                 urlString,
+                                 appString,
+                                 warningString];

[TVL, 2009/10/06 14:41:02]

drive by- maybe a comment as to why this is always save from an l10n pov? 
(ie-windows does the same thing, etc.)

[Avi (use Gerrit), 2009/10/06 14:48:43]

Yes, the other platforms do the same thing, but why would this be an issue? CR
has Bidirectional Category B which is Neutral.

+
+  [alert_ setInformativeText:informativeText];
+
+  [alert_ setShowsSuppressionButton:YES];
+  [[alert_ suppressionButton] setTitle:
+      l10n_util::GetNSStringWithFixup(IDS_EXTERNAL_PROTOCOL_CHECKBOX_TEXT)];
+
+  [alert_ beginSheetModalForWindow:nil  // nil here makes it app-modal
+                     modalDelegate:self
+                    didEndSelector:@selector(alertEnded:returnCode:contextInfo:)
+                       contextInfo:nil];
+
+  return self;
+}
+
+- (void)dealloc {
+  [alert_ release];
+
+  [super dealloc];
+}
+
+- (void)alertEnded:(NSAlert *)alert
+        returnCode:(int)returnCode
+       contextInfo:(void*)contextInfo {
+  ExternalProtocolHandler::BlockState blockState =
+      ExternalProtocolHandler::UNKNOWN;
+  switch (returnCode) {
+    case NSAlertFirstButtonReturn:
+      blockState = ExternalProtocolHandler::DONT_BLOCK;
+      break;
+    case NSAlertSecondButtonReturn:
+      blockState = ExternalProtocolHandler::BLOCK;
+      break;
+    default:
+      NOTREACHED();
+  }
+
+  // Set the "don't warn me again" info if the protocol was blocked ("cancel"
+  // always means "make this dialog go away with no permanent effect" no matter
+  // what).
+  if ([[alert_ suppressionButton] state] == NSOnState &&
+      blockState == ExternalProtocolHandler::BLOCK) {
+    ExternalProtocolHandler::SetBlockState(UTF8ToWide(url_.scheme()),
+                                           blockState);
+  }
+
+  if (blockState == ExternalProtocolHandler::DONT_BLOCK) {
+    UMA_HISTOGRAM_LONG_TIMES("clickjacking.launch_url",
+                             base::Time::Now() - creation_time_);
+
+    ExternalProtocolHandler::LaunchUrlWithoutSecurityCheck(url_);
+  }
+
+  [self autorelease];
+}
+
+- (string16)appNameForProtocol {
+  NSURL* url = [NSURL URLWithString:
+      base::SysUTF8ToNSString(url_.possibly_invalid_spec())];
+  CFURLRef openingApp = NULL;
+  OSStatus status = LSGetApplicationForURL((CFURLRef)url,
+                                           kLSRolesAll,
+                                           NULL,
+                                           &openingApp);
+  if (status != noErr) {
+    // likely kLSApplicationNotFoundErr
+    return string16();
+  }
+  NSString* appPath = [(NSURL*)openingApp path];
+  CFRelease(openingApp);  // NOT A BUG; LSGetApplicationForURL retains for us
+  NSString* appDisplayName =
+      [[NSFileManager defaultManager] displayNameAtPath:appPath];
+
+  return base::SysNSStringToUTF16(appDisplayName);
+}
+
+@end