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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.
#include "extensions/browser/api/declarative_webrequest/webrequest_condition.h"
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
#include "components/url_matcher/url_matcher_factory.h"
#include "extensions/browser/api/declarative_webrequest/request_stage.h"
#include "extensions/browser/api/declarative_webrequest/webrequest_condition_attribute.h"
#include "extensions/browser/api/declarative_webrequest/webrequest_constants.h"
#include "extensions/browser/api/web_request/web_request_info.h"
using url_matcher::URLMatcherConditionFactory;
using url_matcher::URLMatcherConditionSet;
using url_matcher::URLMatcherFactory;
namespace keys = extensions::declarative_webrequest_constants;
namespace {
static base::MatcherStringPattern::ID g_next_id = 0;
// TODO(battre): improve error messaging to give more meaningful messages
// to the extension developer.
// Error messages:
const char kExpectedDictionary[] = "A condition has to be a dictionary.";
const char kConditionWithoutInstanceType[] = "A condition had no instanceType";
const char kExpectedOtherConditionType[] = "Expected a condition of type "
"declarativeWebRequest.RequestMatcher";
const char kInvalidTypeOfParamter[] = "Attribute '%s' has an invalid type";
const char kConditionCannotBeFulfilled[] = "A condition can never be "
"fulfilled because its attributes cannot all be tested at the "
"same time in the request life-cycle.";
} // namespace
namespace extensions {
namespace keys = declarative_webrequest_constants;
//
// WebRequestData
//
WebRequestData::WebRequestData(const WebRequestInfo* request,
RequestStage stage)
: request(request), stage(stage), original_response_headers(nullptr) {}
WebRequestData::WebRequestData(
const WebRequestInfo* request,
RequestStage stage,
const net::HttpResponseHeaders* original_response_headers)
: request(request),
stage(stage),
original_response_headers(original_response_headers) {}
WebRequestData::~WebRequestData() = default;
//
// WebRequestDataWithMatchIds
//
WebRequestDataWithMatchIds::WebRequestDataWithMatchIds(
const WebRequestData* request_data)
: data(request_data) {}
WebRequestDataWithMatchIds::~WebRequestDataWithMatchIds() = default;
//
// WebRequestCondition
//
WebRequestCondition::WebRequestCondition(
scoped_refptr<URLMatcherConditionSet> url_matcher_conditions,
const WebRequestConditionAttributes& condition_attributes)
: url_matcher_conditions_(url_matcher_conditions),
condition_attributes_(condition_attributes),
applicable_request_stages_(~0) {
for (WebRequestConditionAttributes::const_iterator i =
condition_attributes_.begin(); i != condition_attributes_.end(); ++i) {
applicable_request_stages_ &= (*i)->GetStages();
}
}
WebRequestCondition::~WebRequestCondition() = default;
bool WebRequestCondition::IsFulfilled(
const MatchData& request_data) const {
if (!(request_data.data->stage & applicable_request_stages_)) {
// A condition that cannot be evaluated is considered as violated.
return false;
}
// Check URL attributes if present.
if (url_matcher_conditions_.get() &&
!base::Contains(request_data.url_match_ids,
url_matcher_conditions_->id()))
return false;
// All condition attributes must be fulfilled for a fulfilled condition.
for (const auto& condition_attribute : condition_attributes_) {
if (!condition_attribute->IsFulfilled(*(request_data.data))) {
return false;
}
}
return true;
}
void WebRequestCondition::GetURLMatcherConditionSets(
URLMatcherConditionSet::Vector* condition_sets) const {
if (url_matcher_conditions_.get()) {
condition_sets->push_back(url_matcher_conditions_);
}
}
// static
std::unique_ptr<WebRequestCondition> WebRequestCondition::Create(
const Extension* extension,
URLMatcherConditionFactory* url_matcher_condition_factory,
const base::Value& condition,
std::string* error) {
const base::Value::Dict* condition_dict = condition.GetIfDict();
if (!condition_dict) {
*error = kExpectedDictionary;
return nullptr;
}
// Verify that we are dealing with a Condition whose type we understand.
const std::string* instance_type =
condition_dict->FindString(keys::kInstanceTypeKey);
if (!instance_type) {
*error = kConditionWithoutInstanceType;
return nullptr;
}
if (*instance_type != keys::kRequestMatcherType) {
*error = kExpectedOtherConditionType;
return nullptr;
}
WebRequestConditionAttributes attributes;
scoped_refptr<URLMatcherConditionSet> url_matcher_condition_set;
for (const auto entry : *condition_dict) {
const std::string& condition_attribute_name = entry.first;
const base::Value& condition_attribute_value = entry.second;
if (condition_attribute_name == keys::kInstanceTypeKey ||
condition_attribute_name ==
keys::kDeprecatedFirstPartyForCookiesUrlKey ||
condition_attribute_name == keys::kDeprecatedThirdPartyKey) {
// Skip this.
} else if (condition_attribute_name == keys::kUrlKey) {
const base::Value::Dict* dict = condition_attribute_value.GetIfDict();
if (!dict) {
*error = base::StringPrintf(kInvalidTypeOfParamter,
condition_attribute_name.c_str());
} else {
url_matcher_condition_set =
URLMatcherFactory::CreateFromURLFilterDictionary(
url_matcher_condition_factory, *dict, ++g_next_id, error);
}
} else {
scoped_refptr<const WebRequestConditionAttribute> attribute =
WebRequestConditionAttribute::Create(
condition_attribute_name,
&condition_attribute_value,
error);
if (attribute.get()) {
attributes.push_back(attribute);
}
}
if (!error->empty()) {
return nullptr;
}
}
auto result = std::make_unique<WebRequestCondition>(url_matcher_condition_set,
attributes);
if (!result->stages()) {
*error = kConditionCannotBeFulfilled;
return nullptr;
}
return result;
}
} // namespace extensions
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