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      1 // Copyright (c) 2012 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 "chrome/browser/ui/singleton_tabs.h"
      6 
      7 #include "chrome/browser/profiles/profile.h"
      8 #include "chrome/browser/search/search.h"
      9 #include "chrome/browser/ui/browser.h"
     10 #include "chrome/browser/ui/browser_navigator.h"
     11 #include "chrome/browser/ui/tabs/tab_strip_model.h"
     12 #include "chrome/common/url_constants.h"
     13 #include "content/public/browser/browser_url_handler.h"
     14 #include "content/public/browser/web_contents.h"
     15 
     16 namespace chrome {
     17 namespace {
     18 
     19 // Returns true if two URLs are equal after taking |replacements| into account.
     20 bool CompareURLsWithReplacements(const GURL& url,
     21                                  const GURL& other,
     22                                  const url::Replacements<char>& replacements) {
     23   if (url == other)
     24     return true;
     25 
     26   GURL url_replaced = url.ReplaceComponents(replacements);
     27   GURL other_replaced = other.ReplaceComponents(replacements);
     28   return url_replaced == other_replaced;
     29 }
     30 
     31 }  // namespace
     32 
     33 void ShowSingletonTab(Browser* browser, const GURL& url) {
     34   NavigateParams params(GetSingletonTabNavigateParams(browser, url));
     35   Navigate(&params);
     36 }
     37 
     38 void ShowSingletonTabRespectRef(Browser* browser, const GURL& url) {
     39   NavigateParams params(GetSingletonTabNavigateParams(browser, url));
     40   params.ref_behavior = NavigateParams::RESPECT_REF;
     41   Navigate(&params);
     42 }
     43 
     44 void ShowSingletonTabOverwritingNTP(Browser* browser,
     45                                     const NavigateParams& params) {
     46   DCHECK(browser);
     47   NavigateParams local_params(params);
     48   content::WebContents* contents =
     49       browser->tab_strip_model()->GetActiveWebContents();
     50   if (contents) {
     51     const GURL& contents_url = contents->GetURL();
     52     if ((contents_url == GURL(kChromeUINewTabURL) || IsInstantNTP(contents) ||
     53          contents_url == GURL(url::kAboutBlankURL)) &&
     54         GetIndexOfSingletonTab(&local_params) < 0) {
     55       local_params.disposition = CURRENT_TAB;
     56     }
     57   }
     58 
     59   Navigate(&local_params);
     60 }
     61 
     62 NavigateParams GetSingletonTabNavigateParams(Browser* browser,
     63                                              const GURL& url) {
     64   NavigateParams params(browser, url, ui::PAGE_TRANSITION_AUTO_BOOKMARK);
     65   params.disposition = SINGLETON_TAB;
     66   params.window_action = NavigateParams::SHOW_WINDOW;
     67   params.user_gesture = true;
     68   params.tabstrip_add_types |= TabStripModel::ADD_INHERIT_OPENER;
     69   return params;
     70 }
     71 
     72 // Returns the index of an existing singleton tab in |params->browser| matching
     73 // the URL specified in |params|.
     74 int GetIndexOfSingletonTab(NavigateParams* params) {
     75   if (params->disposition != SINGLETON_TAB)
     76     return -1;
     77 
     78   // In case the URL was rewritten by the BrowserURLHandler we need to ensure
     79   // that we do not open another URL that will get redirected to the rewritten
     80   // URL.
     81   GURL rewritten_url(params->url);
     82   bool reverse_on_redirect = false;
     83   content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
     84       &rewritten_url,
     85       params->browser->profile(),
     86       &reverse_on_redirect);
     87 
     88   // If there are several matches: prefer the active tab by starting there.
     89   int start_index =
     90       std::max(0, params->browser->tab_strip_model()->active_index());
     91   int tab_count = params->browser->tab_strip_model()->count();
     92   for (int i = 0; i < tab_count; ++i) {
     93     int tab_index = (start_index + i) % tab_count;
     94     content::WebContents* tab =
     95         params->browser->tab_strip_model()->GetWebContentsAt(tab_index);
     96 
     97     GURL tab_url = tab->GetURL();
     98 
     99     // Skip view-source tabs. This is needed because RewriteURLIfNecessary
    100     // removes the "view-source:" scheme which leads to incorrect matching.
    101     if (tab_url.SchemeIs(content::kViewSourceScheme))
    102       continue;
    103 
    104     GURL rewritten_tab_url = tab_url;
    105     content::BrowserURLHandler::GetInstance()->RewriteURLIfNecessary(
    106       &rewritten_tab_url,
    107       params->browser->profile(),
    108       &reverse_on_redirect);
    109 
    110     url::Replacements<char> replacements;
    111     if (params->ref_behavior == NavigateParams::IGNORE_REF)
    112       replacements.ClearRef();
    113     if (params->path_behavior == NavigateParams::IGNORE_AND_NAVIGATE ||
    114         params->path_behavior == NavigateParams::IGNORE_AND_STAY_PUT) {
    115       replacements.ClearPath();
    116       replacements.ClearQuery();
    117     }
    118 
    119     if (CompareURLsWithReplacements(tab_url, params->url, replacements) ||
    120         CompareURLsWithReplacements(rewritten_tab_url,
    121                                     rewritten_url,
    122                                     replacements)) {
    123       params->target_contents = tab;
    124       return tab_index;
    125     }
    126   }
    127 
    128   return -1;
    129 }
    130 
    131 }  // namespace chrome
    132