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// Copyright (c) 2006-2009 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/browser/shell_integration.h"
#include <fcntl.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <vector>
#include "base/file_path.h"
#include "base/file_util.h"
#include "base/message_loop.h"
#include "base/path_service.h"
#include "base/process_util.h"
#include "base/string_tokenizer.h"
#include "base/string_util.h"
#include "base/task.h"
#include "base/thread.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/chrome_paths.h"
#include "googleurl/src/gurl.h"
namespace {
const char* GetDesktopName() {
#if defined(GOOGLE_CHROME_BUILD)
return "google-chrome.desktop";
#else // CHROMIUM_BUILD
static const char* name = NULL;
if (!name) {
// Allow $CHROME_DESKTOP to override the built-in value, so that development
// versions can set themselves as the default without interfering with
// non-official, packaged versions using the built-in value.
name = getenv("CHROME_DESKTOP");
if (!name)
name = "chromium-browser.desktop";
}
return name;
#endif
}
bool GetDesktopShortcutTemplate(std::string* output) {
std::vector<std::string> search_paths;
const char* xdg_data_home = getenv("XDG_DATA_HOME");
if (xdg_data_home)
search_paths.push_back(xdg_data_home);
const char* xdg_data_dirs = getenv("XDG_DATA_DIRS");
if (xdg_data_dirs) {
StringTokenizer tokenizer(xdg_data_dirs, ":");
while (tokenizer.GetNext()) {
search_paths.push_back(tokenizer.token());
}
}
std::string template_filename(GetDesktopName());
for (std::vector<std::string>::const_iterator i = search_paths.begin();
i != search_paths.end(); ++i) {
FilePath path = FilePath(*i).Append(template_filename);
if (file_util::PathExists(path))
return file_util::ReadFileToString(path, output);
}
return false;
}
class CreateDesktopShortcutTask : public Task {
public:
CreateDesktopShortcutTask(const GURL& url, const string16& title)
: url_(url),
title_(title) {
}
virtual void Run() {
// TODO(phajdan.jr): Report errors from this function, possibly as infobars.
FilePath desktop_path;
if (!PathService::Get(chrome::DIR_USER_DESKTOP, &desktop_path))
return;
desktop_path =
desktop_path.Append(ShellIntegration::GetDesktopShortcutFilename(url_));
if (file_util::PathExists(desktop_path))
return;
std::string template_contents;
if (!GetDesktopShortcutTemplate(&template_contents))
return;
std::string contents = ShellIntegration::GetDesktopFileContents(
template_contents, url_, title_);
int bytes_written = file_util::WriteFile(desktop_path, contents.data(),
contents.length());
if (bytes_written != static_cast<int>(contents.length())) {
file_util::Delete(desktop_path, false);
}
}
private:
const GURL url_; // URL of the web application.
const string16 title_; // Title displayed to the user.
DISALLOW_COPY_AND_ASSIGN(CreateDesktopShortcutTask);
};
} // namespace
// We delegate the difficult of setting the default browser in Linux desktop
// environments to a new xdg utility, xdg-settings. We'll have to include a copy
// of it for this to work, obviously, but that's actually the suggested approach
// for xdg utilities anyway.
bool ShellIntegration::SetAsDefaultBrowser() {
std::vector<std::string> argv;
argv.push_back("xdg-settings");
argv.push_back("set");
argv.push_back("default-web-browser");
argv.push_back(GetDesktopName());
// xdg-settings internally runs xdg-mime, which uses mv to move newly-created
// files on top of originals after making changes to them. In the event that
// the original files are owned by another user (e.g. root, which can happen
// if they are updated within sudo), mv will prompt the user to confirm if
// standard input is a terminal (otherwise it just does it). So make sure it's
// not, to avoid locking everything up waiting for mv.
int devnull = open("/dev/null", O_RDONLY);
if (devnull < 0)
return false;
base::file_handle_mapping_vector no_stdin;
no_stdin.push_back(std::make_pair(devnull, STDIN_FILENO));
base::ProcessHandle handle;
if (!base::LaunchApp(argv, no_stdin, false, &handle)) {
close(devnull);
return false;
}
close(devnull);
int success_code;
base::WaitForExitCode(handle, &success_code);
return success_code == EXIT_SUCCESS;
}
bool ShellIntegration::IsDefaultBrowser() {
std::vector<std::string> argv;
argv.push_back("xdg-settings");
argv.push_back("check");
argv.push_back("default-web-browser");
argv.push_back(GetDesktopName());
std::string reply;
if (!base::GetAppOutput(CommandLine(argv), &reply)) {
// If xdg-settings fails, we assume that we should pretend we're the default
// browser to avoid giving repeated prompts to set ourselves as the default.
// TODO(mdm): Really, being the default browser should be a ternary query:
// yes, no, and "don't know" so the UI can reflect this more accurately.
return true;
}
// Allow any reply that starts with "yes".
return reply.find("yes") == 0;
}
bool ShellIntegration::IsFirefoxDefaultBrowser() {
std::vector<std::string> argv;
argv.push_back("xdg-settings");
argv.push_back("get");
argv.push_back("default-web-browser");
std::string browser;
// We don't care about the return value here.
base::GetAppOutput(CommandLine(argv), &browser);
return browser.find("irefox") != std::string::npos;
}
FilePath ShellIntegration::GetDesktopShortcutFilename(const GURL& url) {
std::wstring filename = UTF8ToWide(url.spec()) + L".desktop";
file_util::ReplaceIllegalCharacters(&filename, '_');
// Return BaseName to be absolutely sure we're not vulnerable to a directory
// traversal attack.
return FilePath::FromWStringHack(filename).BaseName();
}
std::string ShellIntegration::GetDesktopFileContents(
const std::string& template_contents, const GURL& url,
const string16& title) {
// See http://standards.freedesktop.org/desktop-entry-spec/latest/
std::string output_buffer;
StringTokenizer tokenizer(template_contents, "\n");
while (tokenizer.GetNext()) {
// TODO(phajdan.jr): Add the icon.
if (tokenizer.token().substr(0, 5) == "Exec=") {
std::string exec_path = tokenizer.token().substr(5);
StringTokenizer exec_tokenizer(exec_path, " ");
std::string final_path;
while (exec_tokenizer.GetNext()) {
if (exec_tokenizer.token() != "%U")
final_path += exec_tokenizer.token() + " ";
}
std::string app_switch(StringPrintf("\"--app=%s\"",
url.spec().c_str()));
ReplaceSubstringsAfterOffset(&app_switch, 0, "%", "%%");
output_buffer += std::string("Exec=") + final_path + app_switch + "\n";
} else if (tokenizer.token().substr(0, 5) == "Name=") {
std::string final_title = UTF16ToUTF8(title);
// Make sure no endline characters can slip in and possibly introduce
// additional lines (like Exec, which makes it a security risk). Also
// use the URL as a default when the title is empty.
if (final_title.empty() ||
final_title.find("\n") != std::string::npos ||
final_title.find("\r") != std::string::npos)
final_title = url.spec();
output_buffer += StringPrintf("Name=%s\n", final_title.c_str());
} else if (tokenizer.token().substr(0, 8) == "Comment=") {
// Skip the line.
} else {
output_buffer += tokenizer.token() + "\n";
}
}
return output_buffer;
}
void ShellIntegration::CreateDesktopShortcut(const GURL& url,
const string16& title) {
g_browser_process->file_thread()->message_loop()->PostTask(FROM_HERE,
new CreateDesktopShortcutTask(url, title));
}
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