Chromium 中js navigator对象c++实现分析

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一、Navigator 对象

Navigator 对象包罗有关浏览器的信息。

前端测试例子：
  1. <!DOCTYPE html>
  2. <html>
  3. <head>
  4. <meta charset="utf-8">
  5. <title>接口测试</title>
  6. </head>
  7. <body>
  8.        
  9. <div id="example"></div>
  10. <script>
  11. txt = "<p>浏览器代号: " + navigator.appCodeName + "</p>";
  12. txt+= "<p>浏览器名称: " + navigator.appName + "</p>";
  13. txt+= "<p>浏览器版本: " + navigator.appVersion + "</p>";
  14. txt+= "<p>启用Cookies: " + navigator.cookieEnabled + "</p>";
  15. txt+= "<p>硬件平台: " + navigator.platform + "</p>";
  16. txt+= "<p>用户代理: " + navigator.userAgent + "</p>";
  17. txt+= "<p>用户代理语言: " + navigator.language + "</p>";
  18. document.getElementById("example").innerHTML=txt;
  19. </script>
  21. </body>
  22. </html>
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二、Navigator对象c++代码实现如下：

    1）、Navigator接口界说third_party\blink\renderer\core\frame\navigator.idl 

              
  2. // https://html.spec.whatwg.org/C/#the-navigator-object
  4. [
  5.     Exposed=Window
  6. ] interface Navigator {
  7.     // objects implementing this interface also implement the interfaces given below
  9.     // TODO(foolip): vendorSub should be on NavigatorID.
  10.     [HighEntropy=Direct, MeasureAs=NavigatorVendorSub] readonly attribute DOMString vendorSub;
  12.     // TODO(foolip): productSub and vendor are not yet in the spec:
  13.     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=27954
  14.     [HighEntropy=Direct, MeasureAs=NavigatorProductSub] readonly attribute DOMString productSub;
  15.     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=27786
  16.     [HighEntropy=Direct, MeasureAs=NavigatorVendor] readonly attribute DOMString vendor;
  17. };
  19. Navigator includes NavigatorConcurrentHardware;
  20. Navigator includes NavigatorCookies;
  21. Navigator includes NavigatorDeviceMemory;
  22. Navigator includes NavigatorID;
  23. Navigator includes NavigatorLanguage;
  24. Navigator includes NavigatorOnLine;
  25. Navigator includes NavigatorAutomationInformation;
  26. Navigator includes NavigatorUA;
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    1.1）、third_party\blink\renderer\core\frame\navigator_id.idl

  3. // https://html.spec.whatwg.org/C/#client-identification
  5. interface mixin NavigatorID {
  6.     readonly attribute DOMString appCodeName; // constant "Mozilla"
  7.     readonly attribute DOMString appName; // constant "Netscape"
  8.     [HighEntropy=Direct, MeasureAs=NavigatorAppVersion] readonly attribute DOMString appVersion;
  9.     [HighEntropy=Direct, MeasureAs=NavigatorPlatform] readonly attribute DOMString platform;
  10.     readonly attribute DOMString product; // constant "Gecko"
  11.     // https://www.w3.org/Bugs/Public/show_bug.cgi?id=22555
  12.     // boolean taintEnabled(); // constant false
  13.     [HighEntropy=Direct, MeasureAs=NavigatorUserAgent] readonly attribute DOMString userAgent;
  14. };
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2）、Navigator接口c++实现文件：

2.1）、third_party\blink\renderer\core\frame\navigator.h
            third_party\blink\renderer\core\frame\navigator.cc
  2. #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_H_
  3. #define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_H_
  5. #include "third_party/blink/public/common/user_agent/user_agent_metadata.h"
  6. #include "third_party/blink/renderer/core/core_export.h"
  7. #include "third_party/blink/renderer/core/execution_context/navigator_base.h"
  8. #include "third_party/blink/renderer/platform/heap/garbage_collected.h"
  9. #include "third_party/blink/renderer/platform/supplementable.h"
  10. #include "third_party/blink/renderer/platform/wtf/forward.h"
  12. namespace blink {
  14. class CORE_EXPORT Navigator final : public NavigatorBase,
  15.                                     public Supplementable<Navigator> {
  16.   DEFINE_WRAPPERTYPEINFO();
  18. public:
  19.   explicit Navigator(ExecutionContext*);
  21.   // NavigatorCookies
  22.   bool cookieEnabled() const;
  24.   bool webdriver() const;
  26.   String productSub() const;
  27.   String vendor() const;
  28.   String vendorSub() const;
  30.   String platform() const override;
  32.   String GetAcceptLanguages() override;
  33.   void SetUserAgentMetadataForTesting(UserAgentMetadata);
  35.   void Trace(Visitor*) const override;
  37. private:
  38.   UserAgentMetadata metadata_;
  39. };
  41. }  // namespace blink
  43. #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_H_
复制代码
  2.2）、
        third_party\blink\renderer\core\frame\navigator_id.h
        third_party\blink\renderer\core\frame\navigator_id.cc
  2. #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_ID_H_
  3. #define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_ID_H_
  5. #include "third_party/blink/renderer/core/core_export.h"
  6. #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
  8. namespace blink {
  10. class CORE_EXPORT NavigatorID {
  11. public:
  12.   String appCodeName();
  13.   String appName();
  14.   String appVersion();
  15.   virtual String platform() const;
  16.   String product();
  17.   virtual String userAgent() const = 0;
  18. };
  20. }  // namespace blink
  22. #endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_NAVIGATOR_ID_H_
复制代码
3)、v8_navigator接口注册实现文件：

    out\Debug\gen\third_party\blink\renderer\bindings\modules\v8\v8_navigator.cc
    out\Debug\gen\third_party\blink\renderer\bindings\modules\v8\v8_navigator.h
   摘取其中navigator注册以及回调函数界说：
  1. v8::Local<v8::FunctionTemplate> interface_function_template = interface_template.As<v8::FunctionTemplate>();
  2. v8::Local<v8::Signature> signature = v8::Signature::New(isolate, interface_function_template);
  3. {
  4.   static const IDLMemberInstaller::AttributeConfig kAttributeTable[] = {
  5. {"vendorSub", VendorSubAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  6. {"productSub", ProductSubAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  7. {"vendor", VendorAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  8. {"maxTouchPoints", MaxTouchPointsAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  9. {"scheduling", SchedulingAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  10. {"userActivation", UserActivationAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  11. {"doNotTrack", DoNotTrackAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  12. {"geolocation", GeolocationAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  13. {"connection", ConnectionAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  14. {"plugins", PluginsAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  15. {"mimeTypes", MimeTypesAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  16. {"pdfViewerEnabled", PdfViewerEnabledAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  17. {"webkitTemporaryStorage", WebkitTemporaryStorageAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  18. {"webkitPersistentStorage", WebkitPersistentStorageAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  19. {"hardwareConcurrency", HardwareConcurrencyAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  20. {"cookieEnabled", CookieEnabledAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  21. {"appCodeName", AppCodeNameAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  22. {"appName", AppNameAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  23. {"appVersion", AppVersionAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  24. {"platform", PlatformAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  25. {"product", ProductAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  26. {"userAgent", UserAgentAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  27. {"language", LanguageAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  28. {"languages", LanguagesAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  29. {"onLine", OnLineAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  30. {"webdriver", WebdriverAttributeGetCallback, nullptr, unsigned(v8::None), unsigned(IDLMemberInstaller::FlagLocation::kPrototype), unsigned(IDLMemberInstaller::FlagWorld::kAllWorlds), unsigned(IDLMemberInstaller::FlagReceiverCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(IDLMemberInstaller::FlagCrossOriginCheck::kCheck), unsigned(v8::SideEffectType::kHasNoSideEffect), unsigned(V8PrivateProperty::CachedAccessor::kNone)},
  31. };
  32. IDLMemberInstaller::InstallAttributes(isolate, world, instance_template, prototype_template, interface_template, signature, kAttributeTable);
  33. }
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里面其他接口界说，可以自行根据属性值 搜刮idl文件。
4）、打开测试用例看下调用堆栈：

     AppVersionAttributeGetCallback【在v8_navigator.cc 】调用 NavigatorID::appVersion()【navigator_id.cc】。

至此分析完毕，必要改此处的可以在 navigator_id.cc里面做文章。

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