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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "content/public/browser/host_zoom_map.h"
      6 
      7 #include <algorithm>
      8 #include <string>
      9 #include <vector>
     10 
     11 #include "base/bind.h"
     12 #include "base/file_util.h"
     13 #include "base/files/file_path.h"
     14 #include "base/memory/ref_counted.h"
     15 #include "base/memory/scoped_ptr.h"
     16 #include "base/path_service.h"
     17 #include "base/prefs/pref_service.h"
     18 #include "base/strings/stringprintf.h"
     19 #include "base/values.h"
     20 #include "chrome/browser/chrome_page_zoom.h"
     21 #include "chrome/browser/profiles/profile.h"
     22 #include "chrome/browser/ui/browser.h"
     23 #include "chrome/browser/ui/tabs/tab_strip_model.h"
     24 #include "chrome/common/chrome_constants.h"
     25 #include "chrome/common/chrome_paths.h"
     26 #include "chrome/common/pref_names.h"
     27 #include "chrome/test/base/in_process_browser_test.h"
     28 #include "chrome/test/base/testing_profile.h"
     29 #include "chrome/test/base/ui_test_utils.h"
     30 #include "content/public/test/test_utils.h"
     31 #include "net/dns/mock_host_resolver.h"
     32 #include "net/test/embedded_test_server/embedded_test_server.h"
     33 #include "net/test/embedded_test_server/http_response.h"
     34 #include "testing/gmock/include/gmock/gmock.h"
     35 #include "url/gurl.h"
     36 
     37 namespace {
     38 
     39 class ZoomLevelChangeObserver {
     40  public:
     41   explicit ZoomLevelChangeObserver(Profile* profile)
     42       : message_loop_runner_(new content::MessageLoopRunner) {
     43     content::HostZoomMap* host_zoom_map = static_cast<content::HostZoomMap*>(
     44         content::HostZoomMap::GetForBrowserContext(profile));
     45     subscription_ = host_zoom_map->AddZoomLevelChangedCallback(base::Bind(
     46         &ZoomLevelChangeObserver::OnZoomLevelChanged, base::Unretained(this)));
     47   }
     48 
     49   void BlockUntilZoomLevelForHostHasChanged(const std::string& host) {
     50     while (!std::count(changed_hosts_.begin(), changed_hosts_.end(), host)) {
     51       message_loop_runner_->Run();
     52       message_loop_runner_ = new content::MessageLoopRunner;
     53     }
     54     changed_hosts_.clear();
     55   }
     56 
     57  private:
     58   void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change) {
     59     changed_hosts_.push_back(change.host);
     60     message_loop_runner_->Quit();
     61   }
     62 
     63   scoped_refptr<content::MessageLoopRunner> message_loop_runner_;
     64   std::vector<std::string> changed_hosts_;
     65   scoped_ptr<content::HostZoomMap::Subscription> subscription_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(ZoomLevelChangeObserver);
     68 };
     69 
     70 }  // namespace
     71 
     72 class HostZoomMapBrowserTest : public InProcessBrowserTest {
     73  public:
     74   HostZoomMapBrowserTest() {}
     75 
     76  protected:
     77   void SetDefaultZoomLevel(double level) {
     78     browser()->profile()->GetPrefs()->SetDouble(
     79         prefs::kDefaultZoomLevel, level);
     80   }
     81 
     82   double GetZoomLevel(const GURL& url) {
     83     content::HostZoomMap* host_zoom_map = static_cast<content::HostZoomMap*>(
     84         content::HostZoomMap::GetForBrowserContext(browser()->profile()));
     85     return host_zoom_map->GetZoomLevelForHostAndScheme(url.scheme(),
     86                                                        url.host());
     87   }
     88 
     89   std::vector<std::string> GetHostsWithZoomLevels() {
     90     typedef content::HostZoomMap::ZoomLevelVector ZoomLevelVector;
     91     content::HostZoomMap* host_zoom_map = static_cast<content::HostZoomMap*>(
     92         content::HostZoomMap::GetForBrowserContext(browser()->profile()));
     93     content::HostZoomMap::ZoomLevelVector zoom_levels =
     94         host_zoom_map->GetAllZoomLevels();
     95     std::vector<std::string> results;
     96     for (ZoomLevelVector::const_iterator it = zoom_levels.begin();
     97          it != zoom_levels.end(); ++it)
     98       results.push_back(it->host);
     99     return results;
    100   }
    101 
    102   std::vector<std::string> GetHostsWithZoomLevelsFromPrefs() {
    103     PrefService* prefs = browser()->profile()->GetPrefs();
    104     const base::DictionaryValue* values =
    105         prefs->GetDictionary(prefs::kPerHostZoomLevels);
    106     std::vector<std::string> results;
    107     if (values) {
    108       for (base::DictionaryValue::Iterator it(*values);
    109            !it.IsAtEnd(); it.Advance())
    110         results.push_back(it.key());
    111     }
    112     return results;
    113   }
    114 
    115   GURL ConstructTestServerURL(const char* url_template) {
    116     return GURL(base::StringPrintf(
    117         url_template, embedded_test_server()->port()));
    118   }
    119 
    120  private:
    121   scoped_ptr<net::test_server::HttpResponse> HandleRequest(
    122       const net::test_server::HttpRequest& request) {
    123     return scoped_ptr<net::test_server::HttpResponse>(
    124         new net::test_server::BasicHttpResponse);
    125   }
    126 
    127   // BrowserTestBase:
    128   virtual void SetUpOnMainThread() OVERRIDE {
    129     ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
    130     embedded_test_server()->RegisterRequestHandler(base::Bind(
    131         &HostZoomMapBrowserTest::HandleRequest, base::Unretained(this)));
    132     host_resolver()->AddRule("*", "127.0.0.1");
    133   }
    134 
    135   DISALLOW_COPY_AND_ASSIGN(HostZoomMapBrowserTest);
    136 };
    137 
    138 class HostZoomMapSanitizationBrowserTest : public HostZoomMapBrowserTest {
    139  public:
    140   HostZoomMapSanitizationBrowserTest() {}
    141 
    142  private:
    143   // InProcessBrowserTest:
    144   virtual bool SetUpUserDataDirectory() OVERRIDE {
    145     // Zoom-related preferences demonstrating the two problems that could be
    146     // caused by the bug. They incorrectly contain a per-host zoom level for the
    147     // empty host; and a value for 'host1' that only differs from the default by
    148     // epsilon. Neither should have been persisted.
    149     const char kBrokenPrefs[] =
    150         "{'profile': {"
    151         "   'default_zoom_level': 1.2,"
    152         "   'per_host_zoom_levels': {'': 1.1, 'host1': 1.20001, 'host2': 1.3}"
    153         "}}";
    154     std::string broken_prefs(kBrokenPrefs);
    155     std::replace(broken_prefs.begin(), broken_prefs.end(), '\'', '\"');
    156 
    157     base::FilePath user_data_directory, path_to_prefs;
    158     PathService::Get(chrome::DIR_USER_DATA, &user_data_directory);
    159     path_to_prefs = user_data_directory
    160         .AppendASCII(TestingProfile::kTestUserProfileDir)
    161         .Append(chrome::kPreferencesFilename);
    162     base::CreateDirectory(path_to_prefs.DirName());
    163     base::WriteFile(path_to_prefs, broken_prefs.c_str(), broken_prefs.size());
    164     return true;
    165   }
    166 
    167   DISALLOW_COPY_AND_ASSIGN(HostZoomMapSanitizationBrowserTest);
    168 };
    169 
    170 // Regression test for crbug.com/364399.
    171 IN_PROC_BROWSER_TEST_F(HostZoomMapBrowserTest, ToggleDefaultZoomLevel) {
    172   const double default_zoom_level = content::ZoomFactorToZoomLevel(1.5);
    173 
    174   const char kTestURLTemplate1[] = "http://host1:%d/";
    175   const char kTestURLTemplate2[] = "http://host2:%d/";
    176 
    177   ZoomLevelChangeObserver observer(browser()->profile());
    178 
    179   GURL test_url1 = ConstructTestServerURL(kTestURLTemplate1);
    180   ui_test_utils::NavigateToURL(browser(), test_url1);
    181 
    182   SetDefaultZoomLevel(default_zoom_level);
    183   observer.BlockUntilZoomLevelForHostHasChanged(test_url1.host());
    184   EXPECT_TRUE(
    185       content::ZoomValuesEqual(default_zoom_level, GetZoomLevel(test_url1)));
    186 
    187   GURL test_url2 = ConstructTestServerURL(kTestURLTemplate2);
    188   ui_test_utils::NavigateToURLWithDisposition(
    189       browser(), test_url2, NEW_FOREGROUND_TAB,
    190       ui_test_utils::BROWSER_TEST_WAIT_FOR_NAVIGATION);
    191   EXPECT_TRUE(
    192       content::ZoomValuesEqual(default_zoom_level, GetZoomLevel(test_url2)));
    193 
    194   content::WebContents* web_contents =
    195       browser()->tab_strip_model()->GetActiveWebContents();
    196   chrome_page_zoom::Zoom(web_contents, content::PAGE_ZOOM_OUT);
    197   observer.BlockUntilZoomLevelForHostHasChanged(test_url2.host());
    198   EXPECT_FALSE(
    199       content::ZoomValuesEqual(default_zoom_level, GetZoomLevel(test_url2)));
    200 
    201   chrome_page_zoom::Zoom(web_contents, content::PAGE_ZOOM_IN);
    202   observer.BlockUntilZoomLevelForHostHasChanged(test_url2.host());
    203   EXPECT_TRUE(
    204       content::ZoomValuesEqual(default_zoom_level, GetZoomLevel(test_url2)));
    205 
    206   // Now both tabs should be at the default zoom level, so there should not be
    207   // any per-host values saved either to Pref, or internally in HostZoomMap.
    208   EXPECT_TRUE(GetHostsWithZoomLevels().empty());
    209   EXPECT_TRUE(GetHostsWithZoomLevelsFromPrefs().empty());
    210 }
    211 
    212 // Test that garbage data from crbug.com/364399 is cleared up on startup.
    213 IN_PROC_BROWSER_TEST_F(HostZoomMapSanitizationBrowserTest, ClearOnStartup) {
    214   EXPECT_THAT(GetHostsWithZoomLevels(), testing::ElementsAre("host2"));
    215   EXPECT_THAT(GetHostsWithZoomLevelsFromPrefs(), testing::ElementsAre("host2"));
    216 }
    217