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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_H_
#define EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_H_
#include <map>
#include <set>
#include <string>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "components/url_matcher/url_matcher.h"
#include "extensions/browser/api/declarative/declarative_rule.h"
#include "extensions/browser/api/declarative_webrequest/webrequest_condition_attribute.h"
#include "net/http/http_response_headers.h"
namespace extensions {
struct WebRequestInfo;
// Container for information about a URL request to determine which
// rules apply to the request.
struct WebRequestData {
WebRequestData(const WebRequestInfo* request, RequestStage stage);
WebRequestData(const WebRequestInfo* request,
RequestStage stage,
const net::HttpResponseHeaders* original_response_headers);
~WebRequestData();
// The network request that is currently being processed.
raw_ptr<const WebRequestInfo> request;
// The stage (progress) of the network request.
RequestStage stage;
raw_ptr<const net::HttpResponseHeaders> original_response_headers;
};
// Adds information about URL matches to WebRequestData.
struct WebRequestDataWithMatchIds {
explicit WebRequestDataWithMatchIds(const WebRequestData* request_data);
~WebRequestDataWithMatchIds();
raw_ptr<const WebRequestData> data;
std::set<base::MatcherStringPattern::ID> url_match_ids;
};
// Representation of a condition in the Declarative WebRequest API. A condition
// consists of several attributes. Each of these attributes needs to be
// fulfilled in order for the condition to be fulfilled.
//
// We distinguish between two types of conditions:
// - URL Matcher conditions are conditions that test the URL of a request.
// These are treated separately because we use a URLMatcher to efficiently
// test many of these conditions in parallel by using some advanced
// data structures. The URLMatcher tells us if all URL Matcher conditions
// are fulfilled for a WebRequestCondition.
// - All other conditions are represented as WebRequestConditionAttributes.
// These conditions are probed linearly (only if the URL Matcher found a hit).
//
// TODO(battre) Consider making the URLMatcher an owner of the
// URLMatcherConditionSet and only pass a pointer to URLMatcherConditionSet
// in url_matcher_condition_set(). This saves some copying in
// WebRequestConditionSet::GetURLMatcherConditionSets.
class WebRequestCondition {
public:
using MatchData = WebRequestDataWithMatchIds;
WebRequestCondition(
scoped_refptr<url_matcher::URLMatcherConditionSet> url_matcher_conditions,
const WebRequestConditionAttributes& condition_attributes);
WebRequestCondition(const WebRequestCondition&) = delete;
WebRequestCondition& operator=(const WebRequestCondition&) = delete;
~WebRequestCondition();
// Factory method that instantiates a WebRequestCondition according to
// the description `condition` passed by the extension API.
static std::unique_ptr<WebRequestCondition> Create(
const Extension* extension,
url_matcher::URLMatcherConditionFactory* url_matcher_condition_factory,
const base::Value& condition,
std::string* error);
// Returns whether the request matches this condition.
bool IsFulfilled(const MatchData& request_data) const;
// If this condition has url attributes, appends them to `condition_sets`.
void GetURLMatcherConditionSets(
url_matcher::URLMatcherConditionSet::Vector* condition_sets) const;
// Returns a bit vector representing extensions::RequestStage. The bit vector
// contains a 1 for each request stage during which the condition can be
// tested.
int stages() const { return applicable_request_stages_; }
private:
// URL attributes of this condition.
scoped_refptr<url_matcher::URLMatcherConditionSet> url_matcher_conditions_;
// All non-UrlFilter attributes of this condition.
WebRequestConditionAttributes condition_attributes_;
// Bit vector indicating all RequestStage during which all
// `condition_attributes_` can be evaluated.
int applicable_request_stages_;
};
using WebRequestConditionSet = DeclarativeConditionSet<WebRequestCondition>;
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_H_
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