// Copyright (c) 2010 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.
//
// Implementation of the MalwareDetails class.

#include "chrome/browser/safe_browsing/malware_details.h"

#include "chrome/browser/safe_browsing/safe_browsing_service.h"
#include "chrome/browser/tab_contents/navigation_entry.h"
#include "chrome/browser/tab_contents/tab_contents.h"
#include "chrome/browser/safe_browsing/report.pb.h"

// Create a MalwareDetails for the given tab. Runs in the UI thread.
MalwareDetails::MalwareDetails(
    TabContents* tab_contents,
    const SafeBrowsingService::UnsafeResource resource)
    : tab_contents_(tab_contents),
      resource_(resource) {
  StartCollection();
}

MalwareDetails::~MalwareDetails() {}

bool MalwareDetails::IsPublicUrl(const GURL& url) const {
  return url.SchemeIs("http");  // TODO(panayiotis): also skip internal urls.
}

void MalwareDetails::AddNode(const std::string& url,
                             const std::string& parent) {
  if (!IsPublicUrl(GURL(url)))
    return;
  linked_ptr<safe_browsing::ClientMalwareReportRequest::Resource> resource(
      new safe_browsing::ClientMalwareReportRequest::Resource());
  resource->set_url(url);
  if (!parent.empty() && IsPublicUrl(GURL(parent)))
    resource->set_parent(parent);
  urls_[url] = resource;
}

void MalwareDetails::StartCollection() {
  DVLOG(1) << "Starting to compute malware details.";
  report_.reset(new safe_browsing::ClientMalwareReportRequest());

  if (IsPublicUrl(resource_.url)) {
    report_->set_malware_url(resource_.url.spec());
  }

  GURL page_url = tab_contents_->GetURL();
  if (IsPublicUrl(page_url)) {
    report_->set_page_url(page_url.spec());
  }

  GURL referrer_url;
  NavigationEntry* nav_entry = tab_contents_->controller().GetActiveEntry();
  if (nav_entry) {
    referrer_url = nav_entry->referrer();
    if (IsPublicUrl(referrer_url)) {
      report_->set_referrer_url(referrer_url.spec());
    }
  }

  // Add the nodes, starting from the page url.
  AddNode(page_url.spec(), "");

  // Add the resource_url and its original url, if non-empty and different.
  if (!resource_.original_url.spec().empty() &&
      resource_.url != resource_.original_url) {
    // Add original_url, as the parent of resource_url.
    AddNode(resource_.original_url.spec(), "");
    AddNode(resource_.url.spec(), resource_.original_url.spec());
  } else {
    AddNode(resource_.url.spec(), "");
  }

  // Add the referrer url.
  if (nav_entry && !referrer_url.spec().empty()) {
    AddNode(referrer_url.spec(), "");
  }

  // Add all the urls in our |urls_| map to the |report_| protobuf.
  for (ResourceMap::const_iterator it = urls_.begin();
       it != urls_.end(); it++) {
    safe_browsing::ClientMalwareReportRequest::Resource* pb_resource =
        report_->add_nodes();
    pb_resource->CopyFrom(*(it->second));
  }
}

// Called from the SB Service on the IO thread.
const std::string* MalwareDetails::GetSerializedReport() {
  scoped_ptr<std::string> request_data(new std::string());
  if (!report_->SerializeToString(request_data.get())) {
    DLOG(ERROR) << "Unable to serialize the malware report.";
  }

  return request_data.release();
}