Initial setup for Compression Dictionary Transport

https://bugs.webkit.org/show_bug.cgi?id=295249

- Add build/runtime flag for compression dictionary transport.

- Add "compression-dictionary" destination type.
  whatwg/fetch#1854

- Add Link rel "compression-dictionary".
  whatwg/html#11619

Author: fred-wang

Source/WTF/Scripts/Preferences/UnifiedWebPreferences.yaml

@@ -1900,6 +1900,22 @@ CompositingRepaintCountersVisible:
     WebCore:
       default: false
 
+CompressionDictionaryEnabled:
+  type: bool
+  status: testable
+  category: networking
+  condition: ENABLE(COMPRESSION_DICTIONARY_TRANSPORT)
+  humanReadableName: "Compression Dictionary Transport"
+  humanReadableDescription: "Enable compression dictionary transport"
+  defaultValue:
+    WebKitLegacy:
+      default: false
+    WebKit:
+      default: false
+    WebCore:
+      default: false
+  sharedPreferenceForWebProcess: true
+
 CompressionStreamEnabled:
   type: bool
   status: stable

Source/WTF/wtf/PlatformEnableGlib.h

@@ -74,3 +74,7 @@
 #if ENABLE(WPE_PLATFORM) || PLATFORM(GTK)
 #define ENABLE_DAMAGE_TRACKING 1
 #endif
+
+#if PLATFORM(GTK)
+#define ENABLE_COMPRESSION_DICTIONARY_TRANSPORT 1
+#endif

Source/WebCore/Modules/fetch/FetchRequestDestination.idl

@@ -31,6 +31,7 @@ enum FetchRequestDestination {
     "",
     "audio",
     "audioworklet",
+    "compression-dictionary",
     "document",
     "embed",
     "environmentmap",

Source/WebCore/html/LinkRelAttribute.cpp

@@ -53,6 +53,11 @@ static constexpr SortedArrayMap linkTypes { WTF::toArray<std::pair<ComparableLet
     { "alternate"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isAlternate = true; } } },
     { "apple-touch-icon"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.iconType = LinkIconType::TouchIcon; } } },
     { "apple-touch-icon-precomposed"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.iconType = LinkIconType::TouchPrecomposedIcon; } } },
+#if ENABLE(COMPRESSSION_DICTIONARY_TRANSPORT)
+    { "compression-dictionary"_s, { [](auto) { return document.settings().compressionDictionaryEnabled(); }, [](auto relAttribute) { relAttribute.isCompressionDictionary = true; } } },
+#else
+    { "compression-dictionary"_s, { [](auto) { return false; }, [](auto) { } } },
+#endif
     { "dns-prefetch"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isDNSPrefetch = true; } } },
     { "expect"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isInternalResourceLink = true; } } },
     { "icon"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.iconType = LinkIconType::Favicon; } } },

Source/WebCore/html/LinkRelAttribute.h

@@ -56,6 +56,9 @@ struct LinkRelAttribute {
 #if ENABLE(WEB_PAGE_SPATIAL_BACKDROP)
     bool isSpatialBackdrop : 1 { false };
 #endif
+#if ENABLE(COMPRESSION_DICTIONARY_TRANSPORT)
+    bool isCompressionDictionary : 1 { false };
+#endif
 
     LinkRelAttribute() = default;
     LinkRelAttribute(Document&, StringView);

Source/WebCore/loader/FetchOptionsDestination.h

@@ -31,6 +31,7 @@ enum class FetchOptionsDestination : uint8_t {
     EmptyString,
     Audio,
     Audioworklet,
+    CompressionDictionary,
     Document,
     Embed,
     Environmentmap,

Source/WebCore/loader/LinkLoader.cpp

@@ -170,6 +170,8 @@ std::optional<CachedResource::Type> LinkLoader::resourceTypeFromAsAttribute(cons
         return CachedResource::Type::Script;
     case FetchRequestDestination::Document:
         return std::nullopt;
+    case FetchRequestDestination::CompressionDictionary:
+        return std::nullopt;
     case FetchRequestDestination::Embed:
         return std::nullopt;
     case FetchRequestDestination::Environmentmap:

Source/WebCore/platform/network/HTTPHeaderNames.in

@@ -38,6 +38,7 @@ Access-Control-Request-Headers
 Access-Control-Request-Method
 Age
 Authorization
+Available-Dictionary
 Cache-Control
 Clear-Site-Data
 Connection
@@ -60,6 +61,7 @@ Cross-Origin-Resource-Policy
 Date
 DNT
 Default-Style
+Dictionary-ID
 ETag
 Expect
 Expires
@@ -112,6 +114,7 @@ Trailer
 Transfer-Encoding
 Upgrade
 Upgrade-Insecure-Requests
+Use-As-Dictionary
 User-Agent
 Vary
 Via

Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp

@@ -425,6 +425,7 @@ bool NetworkLoadChecker::isAllowedByContentSecurityPolicy(const ResourceRequest&
             return false;
         // FIXME: Check CSP for non-importScripts() initiated loads.
         return true;
+    case FetchOptions::Destination::CompressionDictionary:
     case FetchOptions::Destination::EmptyString:
         return contentSecurityPolicy->allowConnectToSource(request.url(), { }, redirectResponseReceived, preRedirectURL);
     case FetchOptions::Destination::Audio:

Source/WebKit/NetworkProcess/NetworkResourceLoader.cpp

@@ -504,6 +504,7 @@ ResourceLoadInfo NetworkResourceLoader::resourceLoadInfo()
         case WebCore::FetchOptions::Destination::Audio:
             return ResourceLoadInfo::Type::Media;
         case WebCore::FetchOptions::Destination::Audioworklet:
+        case WebCore::FetchOptions::Destination::CompressionDictionary:
             return ResourceLoadInfo::Type::Other;
         case WebCore::FetchOptions::Destination::Document:
         case WebCore::FetchOptions::Destination::Iframe: