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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
* Copyright (C) 2010 Google Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_HTML_PRELOAD_SCANNER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_PARSER_HTML_PRELOAD_SCANNER_H_
#include <memory>
#include <utility>
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/optional.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/css/media_values_cached.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/html/parser/compact_html_token.h"
#include "third_party/blink/renderer/core/html/parser/css_preload_scanner.h"
#include "third_party/blink/renderer/core/html/parser/html_token.h"
#include "third_party/blink/renderer/core/html/parser/preload_request.h"
#include "third_party/blink/renderer/core/page/viewport_description.h"
#include "third_party/blink/renderer/platform/text/segmented_string.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
typedef wtf_size_t TokenPreloadScannerCheckpoint;
class HTMLParserOptions;
class HTMLTokenizer;
class SegmentedString;
struct CORE_EXPORT CachedDocumentParameters {
USING_FAST_MALLOC(CachedDocumentParameters);
public:
enum class LazyLoadImageEnabledState {
kDisabled,
kEnabledExplicit,
kEnabledAutomatic
};
explicit CachedDocumentParameters(Document*);
CachedDocumentParameters() = default;
bool do_html_preload_scanning;
Length default_viewport_min_width;
bool viewport_meta_zero_values_quirk;
bool viewport_meta_enabled;
network::mojom::ReferrerPolicy referrer_policy;
SubresourceIntegrity::IntegrityFeatures integrity_features;
bool lazyload_policy_enforced;
LocalFrame::LazyLoadImageEnabledState lazy_load_image_enabled_state;
};
class TokenPreloadScanner {
USING_FAST_MALLOC(TokenPreloadScanner);
public:
enum class ScannerType { kMainDocument, kInsertion };
TokenPreloadScanner(const KURL& document_url,
std::unique_ptr<CachedDocumentParameters>,
const MediaValuesCached::MediaValuesCachedData&,
const ScannerType,
bool priority_hints_origin_trial_enabled);
~TokenPreloadScanner();
void Scan(const HTMLToken&,
const SegmentedString&,
PreloadRequestStream& requests,
base::Optional<ViewportDescription>*,
bool* is_csp_meta_tag);
void Scan(const CompactHTMLToken&,
const SegmentedString&,
PreloadRequestStream& requests,
base::Optional<ViewportDescription>*,
bool* is_csp_meta_tag);
void SetPredictedBaseElementURL(const KURL& url) {
predicted_base_element_url_ = url;
}
// A TokenPreloadScannerCheckpoint is valid until the next call to rewindTo,
// at which point all outstanding checkpoints are invalidated.
TokenPreloadScannerCheckpoint CreateCheckpoint();
void RewindTo(TokenPreloadScannerCheckpoint);
private:
class StartTagScanner;
template <typename Token>
inline void ScanCommon(const Token&,
const SegmentedString&,
PreloadRequestStream& requests,
base::Optional<ViewportDescription>*,
bool* is_csp_meta_tag);
template <typename Token>
void UpdatePredictedBaseURL(const Token&);
struct Checkpoint {
Checkpoint(const KURL& predicted_base_element_url,
bool in_style,
bool in_script,
size_t template_count)
: predicted_base_element_url(predicted_base_element_url),
in_style(in_style),
in_script(in_script),
template_count(template_count) {}
KURL predicted_base_element_url;
bool in_style;
bool in_script;
size_t template_count;
};
struct PictureData {
PictureData() : source_size(0.0), source_size_set(false), picked(false) {}
String source_url;
float source_size;
bool source_size_set;
bool picked;
};
CSSPreloadScanner css_scanner_;
const KURL document_url_;
KURL predicted_base_element_url_;
bool in_style_;
bool in_picture_;
bool in_script_;
PictureData picture_data_;
size_t template_count_;
std::unique_ptr<CachedDocumentParameters> document_parameters_;
Persistent<MediaValuesCached> media_values_;
ClientHintsPreferences client_hints_preferences_;
ScannerType scanner_type_;
// TODO(domfarolino): Remove this once Priority Hints is no longer in Origin
// Trial (see https://crbug.com/821464). This member exists because
// HTMLPreloadScanner has no access to an ExecutionContext*, and therefore
// cannot determine an Origin Trial's status, so we accept this information in
// the constructor and set this flag accordingly.
bool priority_hints_origin_trial_enabled_;
bool did_rewind_ = false;
Vector<Checkpoint> checkpoints_;
DISALLOW_COPY_AND_ASSIGN(TokenPreloadScanner);
};
class CORE_EXPORT HTMLPreloadScanner {
USING_FAST_MALLOC(HTMLPreloadScanner);
public:
HTMLPreloadScanner(const HTMLParserOptions&,
const KURL& document_url,
std::unique_ptr<CachedDocumentParameters>,
const MediaValuesCached::MediaValuesCachedData&,
const TokenPreloadScanner::ScannerType);
~HTMLPreloadScanner();
void AppendToEnd(const SegmentedString&);
PreloadRequestStream Scan(const KURL& document_base_element_url,
base::Optional<ViewportDescription>*,
bool& has_csp_meta_tag);
private:
TokenPreloadScanner scanner_;
SegmentedString source_;
HTMLToken token_;
std::unique_ptr<HTMLTokenizer> tokenizer_;
DISALLOW_COPY_AND_ASSIGN(HTMLPreloadScanner);
};
} // namespace blink
#endif
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