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/*
* Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_LOADER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_LOADER_H_
#include "third_party/blink/public/mojom/script/script_type.mojom-blink-forward.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/container_node.h"
#include "third_party/blink/renderer/core/html/cross_origin_attribute.h"
#include "third_party/blink/renderer/core/script/pending_script.h"
#include "third_party/blink/renderer/core/script/script_scheduling_type.h"
#include "third_party/blink/renderer/core/speculation_rules/speculation_rule_set.h"
#include "third_party/blink/renderer/platform/bindings/name_client.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_finish_observer.h"
#include "third_party/blink/renderer/platform/loader/fetch/script_fetch_options.h"
#include "third_party/blink/renderer/platform/wtf/text/text_encoding.h"
#include "third_party/blink/renderer/platform/wtf/text/text_position.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class Resource;
class ResourceFetcher;
class ScriptElementBase;
class Script;
class ScriptResource;
class ScriptWebBundle;
class Modulator;
class CORE_EXPORT ScriptLoader final : public ResourceFinishObserver,
public NameClient {
public:
ScriptLoader(ScriptElementBase*, const CreateElementFlags);
~ScriptLoader() override;
void Trace(Visitor*) const override;
const char* NameInHeapSnapshot() const override { return "ScriptLoader"; }
String DebugName() const override { return "ScriptLoader"; }
// Script type at the time of #prepare-the-script-element. Import maps are
// included here but not in `mojom::blink::ScriptType` because import maps are
// handled differently from ordinal scripts after PrepareScript().
enum class ScriptTypeAtPrepare : uint8_t {
kClassic,
kModule,
kImportMap,
kSpeculationRules,
kWebBundle,
kInvalid
};
static ScriptTypeAtPrepare GetScriptTypeAtPrepare(
const String& type_attribute_value,
const String& language_attribute_value);
static bool BlockForNoModule(ScriptTypeAtPrepare, bool nomodule);
static network::mojom::CredentialsMode ModuleScriptCredentialsMode(
CrossOriginAttributeValue);
// Indicate whether the caller of `PrepareScript()` allows
// `kParserBlockingInline` scripts. This matches with the spec:
//
// <spec href="https://html.spec.whatwg.org/C/#prepare-the-script-element"
// step="32.2">... either the parser that created el is an XML parser or it's
// an HTML parser whose script nesting level is not greater than one,
// ...</spec>
enum ParserBlockingInlineOption { kDeny, kAllow };
// https://html.spec.whatwg.org/C/#prepare-the-script-element
// Returns a `PendingScript` when the script is to be managed by the parser
// and the parser should perform some remaining steps of
// `#prepare-the-script-element`. Otherwise returns a `nullptr`, i.e.
// - when called from non-parser call sites,
// - when no scripts are to be evaluated, or
// - when the script is handled by ScriptLoader/ScriptRunner, not by parsers.
[[nodiscard]] PendingScript* PrepareScript(
ParserBlockingInlineOption,
const TextPosition& script_start_position);
bool IsParserInserted() const { return parser_inserted_; }
bool AlreadyStarted() const { return already_started_; }
bool IsForceAsync() const { return force_async_; }
ScriptTypeAtPrepare GetScriptType() const { return script_type_; }
// Helper functions used by our parent classes.
void DidNotifySubtreeInsertionsToDocument();
void ChildrenChanged(const ContainerNode::ChildrenChange&);
void HandleSourceAttribute(const String& source_url);
void HandleAsyncAttribute();
void Removed();
void DocumentBaseURLChanged();
private:
// ResourceFinishObserver. This should be used only for managing
// `resource_keep_alive_` lifetime and shouldn't be used for script
// evaluation.
void NotifyFinished() override;
// Helpers that implement parts of `PrepareScript()` that should be called
// only from `PrepareScript()`.
bool IsScriptForEventSupported() const;
PendingScript* TakePendingScript(ScriptSchedulingType);
// Get the effective script text (after Trusted Types checking).
String GetScriptText() const;
void FetchModuleScriptTree(const KURL&,
ResourceFetcher*,
Modulator*,
const ScriptFetchOptions&);
// Calculate ScriptSchedulingType per spec (#prepare-the-script-element Steps
// 31-32), before any intervention applied.
ScriptSchedulingType GetScriptSchedulingTypePerSpec(
Document& element_document,
ParserBlockingInlineOption) const;
// Methods to add/remove a SpeculationRuleSet in DocumentSpeculationRules.
// Only used for <script type="speculationrules">.
void AddSpeculationRuleSet(SpeculationRuleSet::Source* source);
SpeculationRuleSet* RemoveSpeculationRuleSet();
Member<ScriptElementBase> element_;
// <spec href="https://html.spec.whatwg.org/C/#parser-document">... initially
// null. It is set by the HTML parser and the XML parser on script elements
// they insert, ...</spec>
//
// We use a WeakMember here because we're keeping the parser-inserted
// information separately from the parser document, so ScriptLoader doesn't
// need to keep the parser document alive.
WeakMember<Document> parser_document_;
// A PendingScript is first created in PrepareScript() and stored in
// |prepared_pending_script_|.
// Later, TakePendingScript() is called, and its caller holds a reference
// to the PendingScript instead and |prepared_pending_script_| is cleared.
Member<PendingScript> prepared_pending_script_;
// This is used only to keep the ScriptResource of a classic script alive
// and thus to keep it on MemoryCache, even after script execution, as long
// as ScriptLoader is alive. crbug.com/778799
Member<Resource> resource_keep_alive_;
// This is created only for <script type=webbundle>, representing a webbundle
// mapping rule and its loader.
Member<ScriptWebBundle> script_web_bundle_;
// Speculation rule set registered by this script, if applicable.
Member<SpeculationRuleSet> speculation_rule_set_;
// https://html.spec.whatwg.org/C/#script-processing-model
// "A script element has several associated pieces of state.":
// <spec href="https://html.spec.whatwg.org/C/#already-started">... initially
// false.</spec>
bool already_started_ = false;
// <spec href="https://html.spec.whatwg.org/C/#parser-inserted">... script
// elements with non-null parser documents are known as
// parser-inserted.</spec>
//
// Note that we don't actually implement "parser inserted" in terms of a
// non-null |parser_document_| like the spec, because it is possible for
// |CreateElementFlags::created_by_parser_| to be true even when
// |CreateElementFlags::parser_document_| is null. Therefore, we have to
// store this information separately.
bool parser_inserted_ = false;
// <spec href="https://html.spec.whatwg.org/C/#script-force-async">...
// initially true. ...</spec>
bool force_async_ = true;
// <spec href="https://html.spec.whatwg.org/C/#concept-script-type">...
// initially null. It is determined when the element is prepared, based on the
// type attribute of the element at that time.</spec>
ScriptTypeAtPrepare script_type_ = ScriptTypeAtPrepare::kInvalid;
// <spec href="https://html.spec.whatwg.org/C/#concept-script-external">
// ... initially false. It is determined when the script is prepared, based on
// the src attribute of the element at that time.</spec>
bool is_external_script_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_SCRIPT_SCRIPT_LOADER_H_
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