Linux: handle external protocols, e.g. mailto: links.

chrome/common/platform_util_win.cc

 // 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.
 
 #include "chrome/common/platform_util.h"
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <commdlg.h>
 #include <dwmapi.h>
 #include <shellapi.h>
 #include <shlobj.h>
 
 #include "app/win_util.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/logging.h"
+#include "base/registry.h"
 #include "base/string_util.h"
+#include "googleurl/src/gurl.h"
 
 namespace platform_util {
 
 void ShowItemInFolder(const FilePath& full_path) {
   FilePath dir = full_path.DirName();
   // ParseDisplayName will fail if the directory is "C:", it must be "C:\\".
   if (dir.value() == L"" || !file_util::EnsureEndsWithSeparator(&dir))
     return;
 
   typedef HRESULT (WINAPI *SHOpenFolderAndSelectItemsFuncPtr)(
@@ skipping 49 matching lines @@
     {file_item},
   };
   (*open_folder_and_select_itemsPtr)(dir_item, arraysize(highlight),
                                      highlight, NULL);
 }
 
 void OpenItem(const FilePath& full_path) {
   win_util::OpenItemViaShell(full_path);
 }
 
+void OpenExternal(const GURL& url) {
+  // Quote the input scheme to be sure that the command does not have
+  // parameters unexpected by the external program. This url should already
+  // have been escaped.
+  std::string escaped_url = url.spec();
+  escaped_url.insert(0, "\"");
+  escaped_url += "\"";
+
+  // According to Mozilla in uriloader/exthandler/win/nsOSHelperAppService.cpp:
+  // "Some versions of windows (Win2k before SP3, Win XP before SP1) crash in
+  // ShellExecute on long URLs (bug 161357 on bugzilla.mozilla.org). IE 5 and 6
+  // support URLS of 2083 chars in length, 2K is safe."
+  const size_t kMaxUrlLength = 2048;
+  if (escaped_url.length() > kMaxUrlLength) {
+    NOTREACHED();
+    return;
+  }
+
+  RegKey key;
+  std::wstring registry_path = ASCIIToWide(url.scheme()) +
+                               L"\\shell\\open\\command";
+  key.Open(HKEY_CLASSES_ROOT, registry_path.c_str());
+  if (key.Valid()) {
+    DWORD size = 0;
+    key.ReadValue(NULL, NULL, &size);
+    if (size <= 2) {
+      // ShellExecute crashes the process when the command is empty.
+      // We check for "2" because it always returns the trailing NULL.
+      // TODO(nsylvain): we should also add a dialog to warn on errors. See
+      // bug 1136923.
+      return;
+    }
+  }
+
+  if (reinterpret_cast<ULONG_PTR>(ShellExecuteA(NULL, "open",
+                                                escaped_url.c_str(), NULL, NULL,
+                                                SW_SHOWNORMAL)) <= 32) {
+    // We fail to execute the call. We could display a message to the user.
+    // TODO(nsylvain): we should also add a dialog to warn on errors. See
+    // bug 1136923.
+    return;
+  }
+}
+
 gfx::NativeWindow GetTopLevel(gfx::NativeView view) {
   return GetAncestor(view, GA_ROOT);
 }
 
 string16 GetWindowTitle(gfx::NativeWindow window_handle) {
   std::wstring result;
   int length = ::GetWindowTextLength(window_handle) + 1;
   ::GetWindowText(window_handle, WriteInto(&result, length), length);
   return WideToUTF16(result);
 }
 
 bool IsWindowActive(gfx::NativeWindow window) {
   return ::GetForegroundWindow() == window;
 }
 
 bool IsVisible(gfx::NativeView view) {
   // MSVC complains if we don't include != 0.
   return ::IsWindowVisible(view) != 0;
 }
 
 }  // namespace platform_util