// Copyright (c) 2015 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 "libcef/browser/resource_context.h"

#include "libcef/browser/net/scheme_handler.h"
#include "libcef/browser/thread_util.h"
#include "libcef/common/net/scheme_registration.h"

#include "base/i18n/case_conversion.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "content/browser/resource_context_impl.h"
#include "content/public/browser/browser_thread.h"

#if defined(USE_NSS_CERTS)
#include "net/ssl/client_cert_store_nss.h"
#endif

#if defined(OS_WIN)
#include "net/ssl/client_cert_store_win.h"
#endif

#if defined(OS_MACOSX)
#include "net/ssl/client_cert_store_mac.h"
#endif

CefResourceContext::CefResourceContext(bool is_off_the_record)
    : is_off_the_record_(is_off_the_record) {
  // Using base::Unretained() is safe because both this callback and possible
  // deletion of |this| will execute on the IO thread, and this callback will
  // be executed first.
  CEF_POST_TASK(CEF_IOT, base::Bind(&CefResourceContext::InitOnIOThread,
                                    base::Unretained(this)));
}

CefResourceContext::~CefResourceContext() {}

std::unique_ptr<net::ClientCertStore>
CefResourceContext::CreateClientCertStore() {
#if defined(USE_NSS_CERTS)
  return std::unique_ptr<net::ClientCertStore>(new net::ClientCertStoreNSS(
      net::ClientCertStoreNSS::PasswordDelegateFactory()));
#elif defined(OS_WIN)
  return std::unique_ptr<net::ClientCertStore>(new net::ClientCertStoreWin());
#elif defined(OS_MACOSX)
  return std::unique_ptr<net::ClientCertStore>(new net::ClientCertStoreMac());
#elif defined(USE_OPENSSL)
  // OpenSSL does not use the ClientCertStore infrastructure. On Android client
  // cert matching is done by the OS as part of the call to show the cert
  // selection dialog.
  return std::unique_ptr<net::ClientCertStore>();
#else
#error Unknown platform.
#endif
}

void CefResourceContext::AddHandler(
    int render_process_id,
    int render_frame_id,
    int frame_tree_node_id,
    CefRefPtr<CefRequestContextHandler> handler) {
  CEF_REQUIRE_IOT();
  handler_map_.AddHandler(render_process_id, render_frame_id,
                          frame_tree_node_id, handler);
}

void CefResourceContext::RemoveHandler(int render_process_id,
                                       int render_frame_id,
                                       int frame_tree_node_id) {
  CEF_REQUIRE_IOT();
  handler_map_.RemoveHandler(render_process_id, render_frame_id,
                             frame_tree_node_id);
}

CefRefPtr<CefRequestContextHandler> CefResourceContext::GetHandler(
    int render_process_id,
    int render_frame_id,
    int frame_tree_node_id,
    bool require_frame_match) const {
  CEF_REQUIRE_IOT();
  return handler_map_.GetHandler(render_process_id, render_frame_id,
                                 frame_tree_node_id, require_frame_match);
}

void CefResourceContext::RegisterSchemeHandlerFactory(
    const std::string& scheme_name,
    const std::string& domain_name,
    CefRefPtr<CefSchemeHandlerFactory> factory) {
  CEF_REQUIRE_IOT();

  const std::string& scheme_lower = base::ToLowerASCII(scheme_name);
  std::string domain_lower;

  // Hostname is only supported for standard schemes.
  if (scheme::IsStandardScheme(scheme_lower)) {
    // Hostname might contain Unicode characters.
    domain_lower =
        base::UTF16ToUTF8(base::i18n::ToLower(base::UTF8ToUTF16(domain_name)));
  }

  const auto key = std::make_pair(scheme_lower, domain_lower);

  if (factory) {
    // Add or replace the factory.
    scheme_handler_factory_map_[key] = factory;
  } else {
    // Remove the existing factory, if any.
    auto it = scheme_handler_factory_map_.find(key);
    if (it != scheme_handler_factory_map_.end())
      scheme_handler_factory_map_.erase(it);
  }
}

void CefResourceContext::ClearSchemeHandlerFactories() {
  CEF_REQUIRE_IOT();

  scheme_handler_factory_map_.clear();

  // Restore the default internal handlers.
  scheme::RegisterInternalHandlers(this);
}

CefRefPtr<CefSchemeHandlerFactory> CefResourceContext::GetSchemeHandlerFactory(
    const GURL& url) {
  CEF_REQUIRE_IOT();

  if (scheme_handler_factory_map_.empty())
    return nullptr;

  const std::string& scheme_lower = url.scheme();
  const std::string& domain_lower =
      url.IsStandard() ? url.host() : std::string();

  if (!domain_lower.empty()) {
    // Sanity check.
    DCHECK(scheme::IsStandardScheme(scheme_lower)) << scheme_lower;

    // Try for a match with hostname first.
    const auto it = scheme_handler_factory_map_.find(
        std::make_pair(scheme_lower, domain_lower));
    if (it != scheme_handler_factory_map_.end())
      return it->second;
  }

  // Try for a match with no specified hostname.
  const auto it = scheme_handler_factory_map_.find(
      std::make_pair(scheme_lower, std::string()));
  if (it != scheme_handler_factory_map_.end())
    return it->second;

  return nullptr;
}

void CefResourceContext::InitOnIOThread() {
  CEF_REQUIRE_IOT();

  // Add the default internal handlers.
  scheme::RegisterInternalHandlers(this);
}