chrome里面的about Scheme

ゝ一世哀愁。 2022-09-30 00:36 201阅读 0赞

对about Scheme进行处理的地方：

D:/project/chrome/src/src/chrome/browser/browser\_url\_handler.cc的void BrowserURLHandler::InitURLHandlers()函数

// static
    void BrowserURLHandler::InitURLHandlers() {
      if (!url_handlers_.empty())
        return;
    
      // Visual Studio 2010 has problems converting NULL to the null pointer for
      // std::pair.  See http://connect.microsoft.com/VisualStudio/feedback/details/520043/error-converting-from-null-to-a-pointer-type-in-std-pair
      // It will work if we pass nullptr.
    #if defined(_MSC_VER) && _MSC_VER >= 1600
      URLHandler null_handler = nullptr;
    #else
      URLHandler null_handler = NULL;
    #endif
    
      // Add the default URL handlers.
      url_handlers_.push_back(
          HandlerPair(&ExtensionWebUI::HandleChromeURLOverride, null_handler));
      // about:
      url_handlers_.push_back(HandlerPair(&WillHandleBrowserAboutURL,
                                          null_handler));
      // chrome: & friends.
      url_handlers_.push_back(HandlerPair(&HandleWebUI, null_handler));
      // view-source:
      url_handlers_.push_back(HandlerPair(&HandleViewSource, &ReverseViewSource));
    }

D:/project/chrome/src/src/chrome/browser/browser\_about\_handler.cc 的bool WillHandleBrowserAboutURL(GURL\* url, Profile\* profile)

WillHandleBrowserAboutURL
    bool WillHandleBrowserAboutURL(GURL* url, Profile* profile) {
      // We only handle about: schemes.
      if (!url->SchemeIs(chrome::kAboutScheme))
        return false;
    
      // about:blank is special. Frames are allowed to access about:blank,
      // but they are not allowed to access other types of about pages.
      // Just ignore the about:blank and let the TAB_CONTENTS_WEB handle it.
      if (LowerCaseEqualsASCII(url->spec(), chrome::kAboutBlankURL))
        return false;
    
      // Rewrite about:cache/* URLs to chrome://view-http-cache/*
      if (StartsWithAboutSpecifier(*url, chrome::kAboutCacheURL)) {
        *url = RemapAboutURL(chrome::kNetworkViewCacheURL, *url);
        return true;
      }
    
    #if defined(OS_WIN)
      // Rewrite about:conflicts/* URLs to chrome://conflicts/*
      if (StartsWithAboutSpecifier(*url, chrome::kAboutConflicts)) {
        *url = GURL(chrome::kChromeUIConflictsURL);
        return true;
      }
    #endif
    
      // Rewrite about:flags to chrome://flags/.
      if (LowerCaseEqualsASCII(url->spec(), chrome::kAboutFlagsURL)) {
        *url = GURL(chrome::kChromeUIFlagsURL);
        return true;
      }
    
      // Rewrite about:net-internals/* URLs to chrome://net-internals/*
      if (StartsWithAboutSpecifier(*url, chrome::kAboutNetInternalsURL)) {
        *url = RemapAboutURL(chrome::kNetworkViewInternalsURL, *url);
        return true;
      }
    
      // Rewrite about:gpu/* URLs to chrome://gpu-internals/*
      if (StartsWithAboutSpecifier(*url, chrome::kAboutGpuURL)) {
        *url = RemapAboutURL(chrome::kGpuInternalsURL, *url);
        return true;
      }
    
      // Rewrite about:appcache-internals/* URLs to chrome://appcache/*
      if (StartsWithAboutSpecifier(*url, chrome::kAboutAppCacheInternalsURL)) {
        *url = RemapAboutURL(chrome::kAppCacheViewInternalsURL, *url);
        return true;
      }
    
      // Rewrite about:sync-internals/* URLs (and about:sync, too, for
      // legacy reasons) to chrome://sync-internals/*
      if (StartsWithAboutSpecifier(*url, chrome::kAboutSyncInternalsURL) ||
          StartsWithAboutSpecifier(*url, chrome::kAboutSyncURL)) {
        *url = RemapAboutURL(chrome::kSyncViewInternalsURL, *url);
        return true;
      }
    
      // Rewrite about:plugins to chrome://plugins/.
      if (LowerCaseEqualsASCII(url->spec(), chrome::kAboutPluginsURL)) {
        *url = GURL(chrome::kChromeUIPluginsURL);
        return true;
      }
    
      // Handle URL to crash the browser process.
      if (LowerCaseEqualsASCII(url->spec(), chrome::kAboutBrowserCrash)) {
        // Induce an intentional crash in the browser process.
        int* bad_pointer = NULL;
        *bad_pointer = 42;
        return true;
      }
    
      // Handle URLs to wreck the gpu process.
      GpuProcessHostUIShim* gpu_ui_shim = GpuProcessHostUIShim::GetForRenderer(0);
      if (gpu_ui_shim) {
        if (LowerCaseEqualsASCII(url->spec(), chrome::kAboutGpuCrashURL)) {
          gpu_ui_shim->SendAboutGpuCrash();
          return true;
        }
        if (LowerCaseEqualsASCII(url->spec(), chrome::kAboutGpuHangURL)) {
          gpu_ui_shim->SendAboutGpuHang();
          return true;
        }
      }
    
      // There are a few about: URLs that we hand over to the renderer. If the
      // renderer wants them, don't do any rewriting.
      if (chrome_about_handler::WillHandle(*url))
        return false;
    
      // Anything else requires our special handler; make sure it's initialized.
      InitializeAboutDataSource(profile);
    
      // Special case about:memory to go through a redirect before ending up on
      // the final page. See GetAboutMemoryRedirectResponse above for why.
      if (LowerCaseEqualsASCII(url->path(), kMemoryPath)) {
        *url = GURL("chrome://about/memory-redirect");
        return true;
      }
    
      // Rewrite the about URL to use chrome:. WebKit treats all about URLS the
      // same (blank page), so if we want to display content, we need another
      // scheme.
      std::string about_url = "chrome://about/";
      about_url.append(url->path());
      *url = GURL(about_url);
      return true;
    }

其中通过about:about可以看到所有支持的about Scheme。 about:net-internals， about:tcmalloc， about:gpu 可以了解很多chrome的细节。  
[![image][]][image 1]

这些about scheme的定义在D:/project/chrome/src/src/chrome/common/url\_constants.cc ：

url_constants.cc
    const char kAboutScheme[] = "about";
    const char kBlobScheme[] = "blob";
    const char kChromeDevToolsScheme[] = "chrome-devtools";
    const char kChromeInternalScheme[] = "chrome-internal";
    const char kChromeUIScheme[] = "chrome";
    const char kDataScheme[] = "data";
    const char kExtensionScheme[] = "chrome-extension";
    const char kFileScheme[] = "file";
    const char kFileSystemScheme[] = "filesystem";
    const char kFtpScheme[] = "ftp";
    const char kHttpScheme[] = "http";
    const char kHttpsScheme[] = "https";
    const char kJavaScriptScheme[] = "javascript";
    const char kMailToScheme[] = "mailto";
    const char kMetadataScheme[] = "metadata";
    const char kUserScriptScheme[] = "chrome-user-script";
    const char kViewSourceScheme[] = "view-source";
    
    #if defined(OS_CHROMEOS)
    const char kCrosScheme[] = "cros";
    #endif
    
    const char kStandardSchemeSeparator[] = "://";
    
    const char* kSavableSchemes[] = {
      kHttpScheme,
      kHttpsScheme,
      kFileScheme,
      kFtpScheme,
      kExtensionScheme,
      kChromeDevToolsScheme,
      kChromeUIScheme,
      NULL
    };
    
    const char kAboutAboutURL[] = "about:about";
    const char kAboutAppCacheInternalsURL[] = "about:appcache-internals";
    const char kAboutBlankURL[] = "about:blank";
    const char kAboutCacheURL[] = "about:cache";
    const char kAboutConflicts[] = "about:conflicts";
    const char kAboutCrashURL[] = "about:crash";
    const char kAboutKillURL[] = "about:kill";
    const char kAboutCreditsURL[] = "about:credits";
    const char kAboutDNSURL[] = "about:dns";
    const char kAboutFlagsURL[] = "about:flags";
    const char kAboutGpuURL[] = "about:gpu";
    const char kAboutGpuCrashURL[] = "about:gpucrash";
    const char kAboutGpuHangURL[] = "about:gpuhang";
    const char kAboutHangURL[] = "about:hang";
    const char kAboutHistogramsURL[] = "about:histograms";
    const char kAboutMemoryURL[] = "about:memory";
    const char kAboutNetInternalsURL[] = "about:net-internals";
    const char kAboutPluginsURL[] = "about:plugins";
    const char kAboutShorthangURL[] = "about:shorthang";
    const char kAboutSyncURL[] = "about:sync";
    const char kAboutSyncInternalsURL[] = "about:sync-internals";
    const char kAboutTermsURL[] = "about:terms";
    const char kAboutVersionURL[] = "about:version";
    
    // Use an obfuscated URL to make this nondiscoverable, we only want this
    // to be used for testing.
    const char kAboutBrowserCrash[] = "about:inducebrowsercrashforrealz";
    
    const char kChromeUIAboutAboutURL[] = "chrome://about/about";
    const char kChromeUIAboutCreditsURL[] = "chrome://about/credits";
    const char kChromeUIAboutURL[] = "chrome://settings/about";
    const char kChromeUIAppLauncherURL[] = "chrome://newtab/#mode=app-launcher";
    const char kChromeUIBookmarksURL[] = "chrome://bookmarks/";
    const char kChromeUIBugReportURL[] = "chrome://bugreport/";
    const char kChromeUIConflictsURL[] = "chrome://conflicts/";
    const char kChromeUIConstrainedHTMLTestURL[] = "chrome://constrained-test/";
    const char kChromeUICrashesURL[] = "chrome://crashes/";
    const char kChromeUIDevToolsURL[] = "chrome-devtools://devtools/";
    const char kChromeUIDownloadsURL[] = "chrome://downloads/";
    const char kChromeUIExtensionIconURL[] = "chrome://extension-icon/";
    const char kChromeUIExtensionsURL[] = "chrome://extensions/";
    const char kChromeUIFavIconURL[] = "chrome://favicon/";
    const char kChromeUIFlagsURL[] = "chrome://flags/";
    const char kChromeUIHistory2URL[] = "chrome://history2/";
    const char kChromeUIHistoryURL[] = "chrome://history/";
    const char kChromeUIIPCURL[] = "chrome://about/ipc";
    const char kChromeUIKeyboardURL[] = "chrome://keyboard/";
    const char kChromeUINewTabURL[] = "chrome://newtab";
    const char kChromeUIPluginsURL[] = "chrome://plugins/";
    const char kChromeUIPrintURL[] = "chrome://print/";
    const char kChromeUISettingsURL[] = "chrome://settings/";
    const char kChromeUITextfieldsURL[] = "chrome://textfields/";
    
    #if defined(OS_CHROMEOS)
    const char kChromeUIAboutOSCreditsURL[] = "chrome://about/os-credits";
    const char kChromeUIActivationMessage[] = "chrome://activationmessage/";
    const char kChromeUIFileBrowseURL[] = "chrome://filebrowse/";
    const char kChromeUICollectedCookiesURL[] = "chrome://collected-cookies/";
    const char kChromeUIImageBurnerURL[] = "chrome://imageburner/";
    const char kChromeUIKeyboardOverlayURL[] = "chrome://keyboardoverlay/";
    const char kChromeUIMediaplayerURL[] = "chrome://mediaplayer/";
    const char kChromeUIMobileSetupURL[] = "chrome://mobilesetup/";
    const char kChromeUIRegisterPageURL[] = "chrome://register/";
    const char kChromeUISlideshowURL[] = "chrome://slideshow/";
    const char kChromeUISystemInfoURL[] = "chrome://system/";
    const char kChromeUIUserImageURL[] = "chrome://userimage/";
    #endif
    
    // Keep this list sorted please.
    const char kChromeUIBookmarksHost[] = "bookmarks";
    const char kChromeUIBugReportHost[] = "bugreport";
    const char kChromeUIConflictsHost[] = "conflicts";
    const char kChromeUICrashesHost[] = "crashes";
    const char kChromeUIDevToolsHost[] = "devtools";
    const char kChromeUIDialogHost[] = "dialog";
    const char kChromeUIDownloadsHost[] = "downloads";
    const char kChromeUIExtensionIconHost[] = "extension-icon";
    const char kChromeUIExtensionsHost[] = "extensions";
    const char kChromeUIFavIconHost[] = "favicon";
    const char kChromeUIFlagsHost[] = "flags";
    const char kChromeUIGpuInternalsHost[] = "gpu-internals";
    const char kChromeUIHistoryHost[] = "history";
    const char kChromeUIHistory2Host[] = "history2";
    const char kChromeUIInspectorHost[] = "inspector";
    const char kChromeUIKeyboardHost[] = "keyboard";
    const char kChromeUINetInternalsHost[] = "net-internals";
    const char kChromeUINewTabHost[] = "newtab";
    const char kChromeUIPluginsHost[] = "plugins";
    const char kChromeUIPrintHost[] = "print";
    const char kChromeUIRemotingHost[] = "remoting";
    const char kChromeUIRemotingResourcesHost[] = "remotingresources";
    const char kChromeUIResourcesHost[] = "resources";
    const char kChromeUIScreenshotPath[] = "screenshots";
    const char kChromeUISettingsHost[] = "settings";
    const char kChromeUISyncInternalsHost[] = "sync-internals";
    const char kChromeUISyncResourcesHost[] = "syncresources";
    const char kChromeUITextfieldsHost[] = "textfields";
    const char kChromeUIThemePath[] = "theme";
    const char kChromeUIThumbnailPath[] = "thumb";
    
    #if defined(OS_CHROMEOS)
    const char kChromeUIActivationMessageHost[] = "activationmessage";
    const char kChromeUICollectedCookiesHost[] = "collected-cookies";
    const char kChromeUIFileBrowseHost[] = "filebrowse";
    const char kChromeUIImageBurnerHost[] = "imageburner";
    const char kChromeUIKeyboardOverlayHost[] = "keyboardoverlay";
    const char kChromeUIMediaplayerHost[] = "mediaplayer";
    const char kChromeUIMobileSetupHost[] = "mobilesetup";
    const char kChromeUIRegisterPageHost[] = "register";
    const char kChromeUISlideshowHost[] = "slideshow";
    const char kChromeUISystemInfoHost[] = "system";
    const char kChromeUIMenu[] = "menu";
    const char kChromeUIWrenchMenu[] = "wrench-menu";
    const char kChromeUINetworkMenu[] = "network-menu";
    const char kChromeUIUserImageHost[] = "userimage";
    #endif
    
    #if defined(OS_CHROMEOS) && defined(TOUCH_UI)
    const char kChromeUILoginContainerHost[] = "login-container";
    const char kChromeUILoginHost[] = "login";
    #endif
    
    const char kUnreachableWebDataURL[] = "chrome://chromewebdata/";
    
    const char kAppCacheViewInternalsURL[] = "chrome://appcache-internals/";
    
    const char kBlobViewInternalsURL[] = "chrome://blob-internals/";
    
    const char kCloudPrintResourcesURL[] = "chrome://cloudprintresources/";
    const char kCloudPrintResourcesHost[] = "cloudprintresources";
    const char kCloudPrintSetupHost[] = "cloudprintsetup";
    
    const char kNetworkViewInternalsURL[] = "chrome://net-internals/";
    const char kNetworkViewCacheURL[] = "chrome://view-http-cache/";
    
    const char kSyncViewInternalsURL[] = "chrome://sync-internals/";
    
    // GPU sub pages
    const char kGpuInternalsURL[] = "chrome://gpu-internals/";
    
    // Option sub pages.
    const char kAdvancedOptionsSubPage[] =  "advanced";
    const char kAutoFillSubPage[] = "autofill";
    const char kBrowserOptionsSubPage[] =  "browser";
    const char kClearBrowserDataSubPage[] = "clearBrowserData";
    const char kContentSettingsSubPage[] = "content";
    const char kContentSettingsExceptionsSubPage[] = "contentExceptions";
    const char kDefaultOptionsSubPage[] =  "";
    const char kImportDataSubPage[] = "importData";
    const char kInstantConfirmPage[] = "instantConfirm";
    const char kLanguageOptionsSubPage[] = "languages";
    const char kPersonalOptionsSubPage[] =  "personal";
    const char kPasswordManagerSubPage[] =  "passwords";
    const char kSearchEnginesSubPage[] = "searchEngines";
    #if defined(OS_CHROMEOS)
    const char kInternetOptionsSubPage[] = "internet";
    const char kSystemOptionsSubPage[] = "system";
    #endif
    
    const char kChromeHelpURL[] =
    #if defined(OS_CHROMEOS)
      "http://www.google.com/support/chromeos/";
    #else
      "http://www.google.com/support/chrome/";
    #endif
    
      const char kPageInfoHelpCenterURL[] =
    #if defined(OS_CHROMEOS)
        "http://www.google.com/support/chromeos/bin/answer.py?answer=95617";
    #else
        "http://www.google.com/support/chrome/bin/answer.py?answer=95617";
    #endif
    
    const char kCrashReasonURL[] =
    #if defined(OS_CHROMEOS)
        "http://www.google.com/support/chromeos/bin/answer.py?answer=1047340";
    #else
        "http://www.google.com/support/chrome/bin/answer.py?answer=95669";
    #endif
    
    // TODO: These are currently placeholders that point to the crash
    // docs.  See bug http://crosbug.com/10711
    const char kKillReasonURL[] =
    #if defined(OS_CHROMEOS)
        "http://www.google.com/support/chromeos/bin/answer.py?answer=1047340";
    #else
        "http://www.google.com/support/chrome/bin/answer.py?answer=95669";
    #endif
    
    const char kPrivacyLearnMoreURL[] =
    #if defined(OS_CHROMEOS)
        "http://www.google.com/support/chromeos/bin/answer.py?answer=1047334";
    #else
        "http://www.google.com/support/chrome/bin/answer.py?answer=114836";
    #endif
    
    const char kChromiumProjectURL[] = "http://code.google.com/chromium/";
    
    const char kLearnMoreReportingURL[] =
        "http://www.google.com/support/chrome/bin/answer.py?answer=96817";
    
    const char kOutdatedPluginLearnMoreURL[] =
        "http://www.google.com/support/chrome/bin/answer.py?answer=1181003";

[image]: /images/20220708/7315363437ae4da9800a728243756c3b.png
[image 1]: http://hi.csdn.net/attachment/201103/21/0_1300670526N830.gif