When the download folder does not exist, change the download folder to a user's "Downloads"

chrome/browser/download/save_page_browsertest.cc

Index: chrome/browser/download/save_page_browsertest.cc
diff --git a/chrome/browser/download/save_page_browsertest.cc b/chrome/browser/download/save_page_browsertest.cc
index bb923a3e7307583b0a68bffcb0522d94631039af..da5790542c90f934f0cfab198b7611db07d79a9d 100644
--- a/chrome/browser/download/save_page_browsertest.cc
+++ b/chrome/browser/download/save_page_browsertest.cc
@@ -4,18 +4,26 @@
 
 #include "base/file_path.h"
 #include "base/file_util.h"
+#include "base/i18n/file_util_icu.h"
 #include "base/path_service.h"
 #include "base/scoped_temp_dir.h"
+#include "base/string_util.h"
+#include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/download/download_history.h"
 #include "chrome/browser/download/download_item.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/history/download_history_info.h"
+#include "chrome/browser/download/download_prefs.h"
+#include "chrome/browser/download/download_util.h"
+#include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/webui/active_downloads_ui.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/random.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
@@ -23,12 +31,16 @@
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/common/content_notification_types.h"
 #include "content/common/notification_service.h"
+#include "net/url_request/url_request_filter.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 static const FilePath::CharType* kTestDir = FILE_PATH_LITERAL("save_page");
 
+// The test file used in SavePageBrowserTest.SaveFolder3.
+static const FilePath kTestFile(FILE_PATH_LITERAL("a.htm"));
+
 static const char* kAppendedExtension =
 #if defined(OS_WIN)
     ".htm";
@@ -81,6 +93,59 @@ class SavePageBrowserTest : public InProcessBrowserTest {
 #endif
   }
 
+  // Changes the default folder prefs. This method saves the current folder
+  // for saving HTML, the current folder for saving downloaded files,
+  // the current user's "Downloads" folder and a save type (HTML only or
+  // complete HTML files), and then changes them to |website_save_dir|,
+  // |download_save_dir| and |save_type|, respectively.
+  // If we call this method, we must call RestoreDirectoryPrefs()
+  // after the test to restore the default folder prefs.
+  void ChangeDirectoryPrefs(
+      Profile* profile,
+      const FilePath& website_save_dir,
+      const FilePath& download_save_dir,
+      const SavePackage::SavePackageType save_type) {
+    DCHECK(profile);
+    PrefService* prefs = profile->GetPrefs();
+
+    ASSERT_TRUE(prefs->FindPreference(prefs::kDownloadDefaultDirectory));
+    prev_download_save_dir_ = prefs->GetFilePath(
+        prefs::kDownloadDefaultDirectory);
+
+    // Check whether the preference has the default folder for saving HTML.
+    // If not, initialize it with the default folder for downloaded files.
+    if (!prefs->FindPreference(prefs::kSaveFileDefaultDirectory)) {
+      prefs->RegisterFilePathPref(prefs::kSaveFileDefaultDirectory,
+                                  prev_download_save_dir_,
+                                  PrefService::UNSYNCABLE_PREF);
+    }
+    prev_website_save_dir_ = prefs->GetFilePath(
+        prefs::kSaveFileDefaultDirectory);
+
+    DownloadPrefs* download_prefs =
+        profile->GetDownloadManager()->download_prefs();
+    prev_save_type_ =
+        static_cast<SavePackage::SavePackageType>
+        (download_prefs->save_file_type());
+
+    prefs->SetFilePath(
+        prefs::kSaveFileDefaultDirectory, website_save_dir);
+    prefs->SetFilePath(
+        prefs::kDownloadDefaultDirectory, download_save_dir);
+    prefs->SetInteger(prefs::kSaveFileType, save_type);
+  }
+
+  // Restores the default folder prefs.
+  void RestoreDirectoryPrefs(Profile* profile) {
+    DCHECK(profile);
+    PrefService* prefs = profile->GetPrefs();
+    prefs->SetFilePath(
+        prefs::kSaveFileDefaultDirectory, prev_website_save_dir_);
+    prefs->SetFilePath(
+        prefs::kDownloadDefaultDirectory, prev_download_save_dir_);
+    prefs->SetInteger(prefs::kSaveFileType, prev_save_type_);
+  }
+
   DownloadManager* GetDownloadManager() const {
     DownloadManager* download_manager =
         browser()->profile()->GetDownloadManager();
@@ -107,6 +172,15 @@ class SavePageBrowserTest : public InProcessBrowserTest {
     MessageLoopForUI::current()->Quit();
   }
 
+  // Returns "src/chrome/test/data/{kTestFile}", whatever URL is given.
+  static net::URLRequestJob* FactoryForTestFile(
+      net::URLRequest* request, const std::string& scheme) {
+    FilePath test_dir;
+    EXPECT_TRUE(PathService::Get(chrome::DIR_TEST_DATA, &test_dir));
+    return new URLRequestMockHTTPJob(
+        request, test_dir.Append(kTestDir).Append(kTestFile));
+  }
+
   struct DownloadHistoryInfoMatch
     : public std::unary_function<DownloadHistoryInfo, bool> {
 
@@ -149,8 +223,15 @@ class SavePageBrowserTest : public InProcessBrowserTest {
 
   // Temporary directory we will save pages to.
   ScopedTempDir save_dir_;
+
+  // Temporarily stores the default folder prefs.
+  FilePath prev_website_save_dir_;
+  FilePath prev_download_save_dir_;
+  SavePackage::SavePackageType prev_save_type_;
 };
 
+}  // namespace
+
 IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, SaveHTMLOnly) {
   FilePath file_name(FILE_PATH_LITERAL("a.htm"));
   GURL url = URLRequestMockHTTPJob::GetMockUrl(
@@ -238,6 +319,214 @@ IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, SaveCompleteHTML) {
       dir.AppendASCII("1.css")));
 }
 
+// Checks if an HTML page is saved to the default folder for saving HTML
+// in the following situation:
+// The default folder for saving HTML exists.
+// The default folder for downloaded files exists.
+// The user's "Downloads" folder exists.
+IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, SaveFolder1) {
+  FilePath file(FILE_PATH_LITERAL("a.htm"));
+  GURL url = URLRequestMockHTTPJob::GetMockUrl(
+      FilePath(kTestDir).Append(file));
+  ui_test_utils::NavigateToURL(browser(), url);
+
+  TabContents* current_tab = browser()->GetSelectedTabContents();
+  ASSERT_TRUE(current_tab);
+  ASSERT_TRUE(browser()->profile());
+
+  ScopedTempDir website_save_dir, download_save_dir;
+  // Prepare the default folder for saving HTML.
+  ASSERT_TRUE(website_save_dir.CreateUniqueTempDir());
+  // Prepare the default folder for downloaded files.
+  ASSERT_TRUE(download_save_dir.CreateUniqueTempDir());
+
+  // Changes the default prefs.
+  ChangeDirectoryPrefs(
+      browser()->profile(),
+      website_save_dir.path(),
+      download_save_dir.path(),
+      SavePackage::SAVE_AS_ONLY_HTML);
+
+  string16 title = current_tab->SavePageBasedOnDefaultPrefs();
+  FilePath::StringType basename;
+#if defined(OS_WIN)
+  basename = UTF16ToWide(title);
+  basename.append(FILE_PATH_LITERAL(".htm"));
+#else
+  basename = UTF16ToASCII(title);
+  basename.append(FILE_PATH_LITERAL(".html"));
+#endif
+  file_util::ReplaceIllegalCharactersInPath(&basename, ' ');
+  FilePath downloaded_file = website_save_dir.path().Append(FilePath(basename));
+
+  EXPECT_EQ(url, WaitForSavePackageToFinish());
+
+  CheckDownloadUI(downloaded_file);
+
+  // Is the file downloaded to the default folder for saving HTML?
+  EXPECT_TRUE(file_util::PathExists(downloaded_file));
+  EXPECT_TRUE(file_util::ContentsEqual(
+      test_dir_.Append(FilePath(kTestDir)).Append(file),
+      downloaded_file));
+
+  RestoreDirectoryPrefs(browser()->profile());
+}
+
+// Checks if an HTML page is saved to the default folder for downloaded files
+// in the following situation:
+// The default folder for saving HTML does not exist.
+// The default folder for downloaded files exists.
+// The user's "Downloads" folder exists.
+IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, SaveFolder2) {
+  FilePath file(FILE_PATH_LITERAL("a.htm"));
+  GURL url = URLRequestMockHTTPJob::GetMockUrl(
+      FilePath(kTestDir).Append(file));
+  ui_test_utils::NavigateToURL(browser(), url);
+
+  TabContents* current_tab = browser()->GetSelectedTabContents();
+  ASSERT_TRUE(current_tab);
+  ASSERT_TRUE(browser()->profile());
+
+  ScopedTempDir download_save_dir;
+  // Prepare the default folder for saving downloaded files.
+  ASSERT_TRUE(download_save_dir.CreateUniqueTempDir());
+  // Prepare non-existent folder.
+  FilePath nonexistent_path(
+      FILE_PATH_LITERAL("/tmp/koakuma_mikity_moemoe_nyannyan"));
+  ASSERT_FALSE(file_util::PathExists(nonexistent_path));
+
+  // Changes the default prefs.
+  ChangeDirectoryPrefs(
+      browser()->profile(),
+      nonexistent_path,
+      download_save_dir.path(),
+      SavePackage::SAVE_AS_ONLY_HTML);
+
+  string16 title = current_tab->SavePageBasedOnDefaultPrefs();
+  FilePath::StringType basename;
+#if defined(OS_WIN)
+  basename = UTF16ToWide(title);
+  basename.append(FILE_PATH_LITERAL(".htm"));
+#else
+  basename = UTF16ToASCII(title);
+  basename.append(FILE_PATH_LITERAL(".html"));
+#endif
+  file_util::ReplaceIllegalCharactersInPath(&basename, ' ');
+  FilePath downloaded_file =
+      download_save_dir.path().Append(FilePath(basename));
+
+  EXPECT_EQ(url, WaitForSavePackageToFinish());
+
+  CheckDownloadUI(downloaded_file);
+
+  // Is the file downloaded to the default folder for downloaded files?
+  EXPECT_TRUE(file_util::PathExists(downloaded_file));
+  EXPECT_FALSE(file_util::PathExists(nonexistent_path));
+  EXPECT_TRUE(file_util::ContentsEqual(
+      test_dir_.Append(FilePath(kTestDir)).Append(file),
+      downloaded_file));
+
+  RestoreDirectoryPrefs(browser()->profile());
+}
+
+// Checks if an HTML page is saved to the user's "Downloads" folder
+// in the following situation:
+// The default folder for saving HTML does not exist.
+// The default folder for downloaded files does not exist.
+// The user's "Downloads" folder exists.
+//
+// This test creates and deletes a file on the user's real "Downloads" folder,
+// which is globally shared among all tests on the testing environment.
+// Therefore, if we run browser tests in parallel, the file created by one
+// browser test may be deleted by another broswer test when the file name
+// conflicts. In order to avoid this problem, we use a special mock URL
+// "http://mock.testfile.http/<random path>" for this download test.
+// Since we redirect "http://mock.testfile.http/<random path>" to
+// "chrome/test/data/{kTestFile}" using FactoryForTestFile(),
+// "chrome/test/data/{kTestFile}" is used for the file to be downloaded.
+// Then, the downloaded file is saved as a name "Downloads/<random path>",
+// which is a unique file name in the user's real "Downloads" folder.
+//
+// Ideally, in the first place, we should not use the user's "Downloads" folder.
+// Instead, we should create a temporary "Downloads" folder for each test.
+// However, we concluded that creating temporary "Downloads" folder for each
+// test requires very invasive code changes to many places. See also here:
+// http://codereview.chromium.org/6973052/
+IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, SaveFolder3) {
+  FilePath file(kTestFile);
+
+  // Redirects "http://mock.testfile.http/<random path>"
+  // to "src/chrome/test/data/{kTestFile}", whatever the <random path> is.
+  std::string kMockHostnameForTestFile = "mock.testfile.http";
+  net::URLRequestFilter* filter = net::URLRequestFilter::GetInstance();
+  filter->AddHostnameHandler(
+      "http", kMockHostnameForTestFile, FactoryForTestFile);
+  std::string random_string = Generate128BitRandomBase64String();
+  RemoveChars(random_string, "/", &random_string);
+  GURL url("http://" + kMockHostnameForTestFile + "/" + random_string);
+  ui_test_utils::NavigateToURL(browser(), url);
+
+  TabContents* current_tab = browser()->GetSelectedTabContents();
+  ASSERT_TRUE(current_tab);
+  ASSERT_TRUE(browser()->profile());
+
+  // Prepare non-existent folder.
+  FilePath nonexistent_path1(
+      FILE_PATH_LITERAL("/tmp/koakuma_mikity_moemoe_nyannyan"));
+  FilePath nonexistent_path2(
+      FILE_PATH_LITERAL("/tmp/koakuma_mikity_moemoe_pyonpyon"));
+  ASSERT_FALSE(file_util::PathExists(nonexistent_path1));
+  ASSERT_FALSE(file_util::PathExists(nonexistent_path2));
+
+  // Changes the default prefs.
+  ChangeDirectoryPrefs(
+      browser()->profile(),
+      nonexistent_path1,
+      nonexistent_path2,
+      SavePackage::SAVE_AS_ONLY_HTML);
+
+  string16 title = current_tab->SavePageBasedOnDefaultPrefs();
+  FilePath::StringType basename;
+#if defined(OS_WIN)
+  basename = UTF16ToWide(title);
+  basename.append(FILE_PATH_LITERAL(".htm"));
+#else
+  basename = UTF16ToASCII(title);
+  basename.append(FILE_PATH_LITERAL(".html"));
+#endif
+  file_util::ReplaceIllegalCharactersInPath(&basename, ' ');
+  FilePath default_download_dir =
+      download_util::GetDefaultDownloadDirectoryFromPathService();
+  FilePath downloaded_file =
+      default_download_dir.Append(FilePath(basename));
+  // Make sure that the target file does not exist.
+  // This fails when the file does not exist, but it is OK.
+  file_util::Delete(downloaded_file, false);
+  // Make sure that the temporary file does not exist.
+  FilePath temporary_file =
+      default_download_dir.Append(FilePath(
+          basename + FILE_PATH_LITERAL(".crdownload")));
+  // This fails when the file does not exist, but it is OK.
+  file_util::Delete(temporary_file, false);
+
+  EXPECT_EQ(url, WaitForSavePackageToFinish());
+
+  CheckDownloadUI(downloaded_file);
+
+  // Is the file downloaded to the user's "Downloads" directory?
+  EXPECT_TRUE(file_util::PathExists(downloaded_file));
+  EXPECT_FALSE(file_util::PathExists(nonexistent_path1));
+  EXPECT_FALSE(file_util::PathExists(nonexistent_path2));
+  EXPECT_TRUE(file_util::ContentsEqual(
+      test_dir_.Append(FilePath(kTestDir)).Append(file), downloaded_file));
+
+  // Clean up the generated files.
+  ASSERT_TRUE(file_util::Delete(downloaded_file, false));
+  ASSERT_TRUE(file_util::Delete(temporary_file, false));
+
+  RestoreDirectoryPrefs(browser()->profile());
+}
+
 IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, NoSave) {
   ui_test_utils::NavigateToURL(browser(), GURL(chrome::kAboutBlankURL));
   ASSERT_TRUE(browser()->command_updater()->SupportsCommand(IDC_SAVE_PAGE));
@@ -317,5 +606,3 @@ IN_PROC_BROWSER_TEST_F(SavePageBrowserTest, RemoveFromList) {
       test_dir_.Append(FilePath(kTestDir)).Append(file_name),
       full_file_name));
 }
-
-}