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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_content/content_condition.h"
#include "base/strings/stringprintf.h"
#include "base/values.h"
#include "chrome/browser/extensions/api/declarative_content/content_constants.h"
#include "components/url_matcher/url_matcher_factory.h"
using url_matcher::URLMatcherConditionFactory;
using url_matcher::URLMatcherConditionSet;
using url_matcher::URLMatcherFactory;
namespace keys = extensions::declarative_content_constants;
namespace {
static URLMatcherConditionSet::ID g_next_id = 0;
// TODO(jyasskin): 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 "
"declarativeContent.PageStateMatcher";
const char kUnknownConditionAttribute[] = "Unknown condition attribute '%s'";
const char kInvalidTypeOfParamter[] = "Attribute '%s' has an invalid type";
} // namespace
namespace extensions {
namespace keys = declarative_content_constants;
RendererContentMatchData::RendererContentMatchData() {}
RendererContentMatchData::~RendererContentMatchData() {}
//
// ContentCondition
//
ContentCondition::ContentCondition(
scoped_refptr<URLMatcherConditionSet> url_matcher_conditions,
const std::vector<std::string>& css_selectors)
: url_matcher_conditions_(url_matcher_conditions),
css_selectors_(css_selectors) {
CHECK(url_matcher_conditions.get());
}
ContentCondition::~ContentCondition() {}
bool ContentCondition::IsFulfilled(
const RendererContentMatchData& renderer_data) const {
if (!ContainsKey(renderer_data.page_url_matches,
url_matcher_conditions_->id()))
return false;
// All attributes must be fulfilled for a fulfilled condition.
for (std::vector<std::string>::const_iterator i =
css_selectors_.begin(); i != css_selectors_.end(); ++i) {
if (!ContainsKey(renderer_data.css_selectors, *i))
return false;
}
return true;
}
// static
scoped_ptr<ContentCondition> ContentCondition::Create(
const Extension* extension,
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<ContentCondition>();
}
// Verify that we are dealing with a Condition whose type we understand.
std::string instance_type;
if (!condition_dict->GetString(keys::kInstanceType, &instance_type)) {
*error = kConditionWithoutInstanceType;
return scoped_ptr<ContentCondition>();
}
if (instance_type != keys::kPageStateMatcherType) {
*error = kExpectedOtherConditionType;
return scoped_ptr<ContentCondition>();
}
scoped_refptr<URLMatcherConditionSet> url_matcher_condition_set;
std::vector<std::string> css_rules;
for (base::DictionaryValue::Iterator iter(*condition_dict);
!iter.IsAtEnd(); iter.Advance()) {
const std::string& condition_attribute_name = iter.key();
const base::Value& condition_attribute_value = iter.value();
if (condition_attribute_name == keys::kInstanceType) {
// Skip this.
} else if (condition_attribute_name == keys::kPageUrl) {
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 (condition_attribute_name == keys::kCss) {
const base::ListValue* css_rules_value = NULL;
if (condition_attribute_value.GetAsList(&css_rules_value)) {
for (size_t i = 0; i < css_rules_value->GetSize(); ++i) {
std::string css_rule;
if (!css_rules_value->GetString(i, &css_rule)) {
*error = base::StringPrintf(kInvalidTypeOfParamter,
condition_attribute_name.c_str());
break;
}
css_rules.push_back(css_rule);
}
} else {
*error = base::StringPrintf(kInvalidTypeOfParamter,
condition_attribute_name.c_str());
}
} else {
*error = base::StringPrintf(kUnknownConditionAttribute,
condition_attribute_name.c_str());
}
if (!error->empty())
return scoped_ptr<ContentCondition>();
}
if (!url_matcher_condition_set.get()) {
URLMatcherConditionSet::Conditions url_matcher_conditions;
url_matcher_conditions.insert(
url_matcher_condition_factory->CreateHostPrefixCondition(
std::string()));
url_matcher_condition_set =
new URLMatcherConditionSet(++g_next_id, url_matcher_conditions);
}
return scoped_ptr<ContentCondition>(
new ContentCondition(url_matcher_condition_set, css_rules));
}
} // namespace extensions
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