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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_condition.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/stringprintf.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/declarative_webrequest/request_stages.h"
#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h"
#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_constants.h"
#include "chrome/common/extensions/matcher/url_matcher.h"
#include "chrome/common/extensions/matcher/url_matcher_factory.h"
#include "net/url_request/url_request.h"
namespace keys = extensions::declarative_webrequest_constants;
namespace {
static extensions::URLMatcherConditionSet::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 kUnknownConditionAttribute[] = "Unknown condition attribute '%s'";
const char kInvalidTypeOfParamter[] = "Attribute '%s' has an invalid type";
} // namespace
namespace extensions {
namespace keys = declarative_webrequest_constants;
//
// 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) {
CHECK(url_matcher_conditions.get());
for (WebRequestConditionAttributes::const_iterator i =
condition_attributes_.begin(); i != condition_attributes_.end(); ++i) {
applicable_request_stages_ &= (*i)->GetStages();
}
}
WebRequestCondition::~WebRequestCondition() {}
bool WebRequestCondition::IsFulfilled(net::URLRequest* request,
RequestStages request_stage) const {
// All condition attributes must be fulfilled for a fulfilled condition.
if (!(request_stage & applicable_request_stages_)) {
// A condition that cannot be evaluated is considered as violated.
return false;
}
for (WebRequestConditionAttributes::const_iterator i =
condition_attributes_.begin(); i != condition_attributes_.end(); ++i) {
if (!(*i)->IsFulfilled(request, request_stage))
return false;
}
return true;
}
// static
scoped_ptr<WebRequestCondition> WebRequestCondition::Create(
URLMatcherConditionFactory* url_matcher_condition_factory,
const base::Value& condition,
std::string* error) {
const base::DictionaryValue* condition_dict = NULL;
if (!condition.GetAsDictionary(&condition_dict)) {
*error = kExpectedDictionary;
return scoped_ptr<WebRequestCondition>(NULL);
}
// Verify that we are dealing with a Condition whose type we understand.
std::string instance_type;
if (!condition_dict->GetString(keys::kInstanceTypeKey, &instance_type)) {
*error = kConditionWithoutInstanceType;
return scoped_ptr<WebRequestCondition>(NULL);
}
if (instance_type != keys::kRequestMatcherType) {
*error = kExpectedOtherConditionType;
return scoped_ptr<WebRequestCondition>(NULL);
}
WebRequestConditionAttributes attributes;
scoped_refptr<URLMatcherConditionSet> url_matcher_condition_set;
for (base::DictionaryValue::Iterator iter(*condition_dict);
iter.HasNext(); iter.Advance()) {
const std::string& condition_attribute_name = iter.key();
const Value& condition_attribute_value = iter.value();
if (condition_attribute_name == keys::kInstanceTypeKey) {
// Skip this.
} else if (condition_attribute_name == keys::kUrlKey) {
const base::DictionaryValue* dict = NULL;
if (!condition_attribute_value.GetAsDictionary(&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 if (WebRequestConditionAttribute::IsKnownType(
condition_attribute_name)) {
scoped_ptr<WebRequestConditionAttribute> attribute =
WebRequestConditionAttribute::Create(
condition_attribute_name,
&condition_attribute_value,
error);
if (attribute.get())
attributes.push_back(make_linked_ptr(attribute.release()));
} else {
*error = base::StringPrintf(kUnknownConditionAttribute,
condition_attribute_name.c_str());
}
if (!error->empty())
return scoped_ptr<WebRequestCondition>(NULL);
}
if (!url_matcher_condition_set) {
URLMatcherConditionSet::Conditions url_matcher_conditions;
url_matcher_conditions.insert(
url_matcher_condition_factory->CreateHostPrefixCondition(""));
url_matcher_condition_set =
new URLMatcherConditionSet(++g_next_id, url_matcher_conditions);
}
return scoped_ptr<WebRequestCondition>(
new WebRequestCondition(url_matcher_condition_set, attributes));
}
//
// WebRequestConditionSet
//
WebRequestConditionSet::WebRequestConditionSet(
const std::vector<linked_ptr<WebRequestCondition> >& conditions)
: conditions_(conditions) {
for (Conditions::iterator i = conditions_.begin(); i != conditions_.end();
++i) {
URLMatcherConditionSet::ID trigger_id =
(*i)->url_matcher_condition_set_id();
match_triggers_[trigger_id] = i->get();
}
}
WebRequestConditionSet::~WebRequestConditionSet() {}
bool WebRequestConditionSet::IsFulfilled(
URLMatcherConditionSet::ID url_match,
net::URLRequest* request,
RequestStages request_stage) const {
MatchTriggers::const_iterator trigger = match_triggers_.find(url_match);
DCHECK(trigger != match_triggers_.end());
DCHECK_EQ(url_match, trigger->second->url_matcher_condition_set_id());
return trigger->second->IsFulfilled(request, request_stage);
}
void WebRequestConditionSet::GetURLMatcherConditionSets(
URLMatcherConditionSet::Vector* condition_sets) const {
for (Conditions::const_iterator i = conditions_.begin();
i != conditions_.end(); ++i) {
condition_sets->push_back((*i)->url_matcher_condition_set());
}
}
// static
scoped_ptr<WebRequestConditionSet> WebRequestConditionSet::Create(
URLMatcherConditionFactory* url_matcher_condition_factory,
const AnyVector& conditions,
std::string* error) {
std::vector<linked_ptr<WebRequestCondition> > result;
for (AnyVector::const_iterator i = conditions.begin();
i != conditions.end(); ++i) {
CHECK(i->get());
scoped_ptr<WebRequestCondition> condition =
WebRequestCondition::Create(url_matcher_condition_factory,
(*i)->value(), error);
if (!error->empty())
return scoped_ptr<WebRequestConditionSet>(NULL);
result.push_back(make_linked_ptr(condition.release()));
}
return scoped_ptr<WebRequestConditionSet>(new WebRequestConditionSet(result));
}
} // namespace extensions
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