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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_rule.h"
#include "base/logging.h"
#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_action.h"
#include "chrome/browser/extensions/api/declarative_webrequest/webrequest_condition.h"
#include "chrome/browser/extensions/api/web_request/web_request_api_helpers.h"
#include "chrome/browser/extensions/api/web_request/web_request_permissions.h"
#include "chrome/browser/extensions/extension_info_map.h"
#include "chrome/common/extensions/extension.h"
namespace {
const char kInvalidActionDatatype[] = "An action of a rule set had an invalid "
"structure that should have been caught by the JSON validator.";
const char kActionCannotBeExecuted[] = "An action can never be executed "
"because there are is no time in the request life-cycle during which the "
"conditions can be checked and the action can possibly be executed.";
} // namespace
namespace extensions {
WebRequestRule::WebRequestRule(
const GlobalRuleId& id,
base::Time extension_installation_time,
scoped_ptr<WebRequestConditionSet> conditions,
scoped_ptr<WebRequestActionSet> actions,
Priority priority)
: id_(id),
extension_installation_time_(extension_installation_time),
conditions_(conditions.release()),
actions_(actions.release()),
priority_(priority) {
CHECK(conditions_.get());
CHECK(actions_.get());
}
WebRequestRule::~WebRequestRule() {}
// static
bool WebRequestRule::CheckConsistency(
WebRequestConditionSet* conditions,
WebRequestActionSet* actions,
std::string* error) {
// Actions and conditions can be checked and executed in specific phases
// of each web request. We consider a rule inconsistent if there is an action
// that cannot be triggered by any condition.
for (WebRequestActionSet::Actions::const_iterator action_iter =
actions->actions().begin();
action_iter != actions->actions().end();
++action_iter) {
bool found_matching_condition = false;
for (WebRequestConditionSet::Conditions::const_iterator condition_iter =
conditions->conditions().begin();
condition_iter != conditions->conditions().end() &&
!found_matching_condition;
++condition_iter) {
// Test the intersection of bit masks, this is intentionally & and not &&.
if ((*action_iter)->GetStages() & (*condition_iter)->stages())
found_matching_condition = true;
}
if (!found_matching_condition) {
*error = kActionCannotBeExecuted;
return false;
}
}
return true;
}
// static
scoped_ptr<WebRequestRule> WebRequestRule::Create(
URLMatcherConditionFactory* url_matcher_condition_factory,
const std::string& extension_id,
base::Time extension_installation_time,
linked_ptr<RulesRegistry::Rule> rule,
std::string* error) {
scoped_ptr<WebRequestRule> error_result;
scoped_ptr<WebRequestConditionSet> conditions =
WebRequestConditionSet::Create(
url_matcher_condition_factory, rule->conditions, error);
if (!error->empty())
return error_result.Pass();
CHECK(conditions.get());
bool bad_message = false;
scoped_ptr<WebRequestActionSet> actions =
WebRequestActionSet::Create(rule->actions, error, &bad_message);
if (bad_message) {
// TODO(battre) Export concept of bad_message to caller, the extension
// should be killed in case it is true.
*error = kInvalidActionDatatype;
return error_result.Pass();
}
if (!error->empty() || bad_message)
return error_result.Pass();
CHECK(actions.get());
if (!CheckConsistency(conditions.get(), actions.get(), error)) {
DCHECK(!error->empty());
return error_result.Pass();
}
CHECK(rule->priority.get());
int priority = *(rule->priority);
GlobalRuleId rule_id(extension_id, *(rule->id));
return scoped_ptr<WebRequestRule>(
new WebRequestRule(rule_id, extension_installation_time,
conditions.Pass(), actions.Pass(), priority));
}
std::list<LinkedPtrEventResponseDelta> WebRequestRule::CreateDeltas(
const ExtensionInfoMap* extension_info_map,
const RequestData& request_data,
bool crosses_incognito) const {
return actions_->CreateDeltas(extension_info_map, extension_id(),
request_data, crosses_incognito,
extension_installation_time_);
}
int WebRequestRule::GetMinimumPriority() const {
return actions_->GetMinimumPriority();
}
} // namespace extensions
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