// Copyright (c) 2015 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#include "atom/browser/api/atom_api_cookies.h"

#include "atom/common/native_mate_converters/callback.h"
#include "atom/common/native_mate_converters/gurl_converter.h"
#include "atom/common/native_mate_converters/value_converter.h"
#include "base/bind.h"
#include "base/time/time.h"
#include "base/values.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "native_mate/dictionary.h"
#include "native_mate/object_template_builder.h"
#include "net/cookies/cookie_monster.h"
#include "net/cookies/cookie_store.h"
#include "net/cookies/cookie_util.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter.h"

#include "atom/common/node_includes.h"

using atom::api::Cookies;
using content::BrowserThread;

namespace {

bool GetCookieListFromStore(
    net::CookieStore* cookie_store,
    const std::string& url,
    const net::CookieMonster::GetCookieListCallback& callback) {
  DCHECK(cookie_store);
  GURL gurl(url);
  net::CookieMonster* monster = cookie_store->GetCookieMonster();
  // Empty url will match all url cookies.
  if (url.empty()) {
    monster->GetAllCookiesAsync(callback);
    return true;
  }

  if (!gurl.is_valid())
    return false;

  monster->GetAllCookiesForURLAsync(gurl, callback);
  return true;
}

void RunGetCookiesCallbackOnUIThread(v8::Isolate* isolate,
                                     const std::string& error_message,
                                     const net::CookieList& cookie_list,
                                     const Cookies::CookiesCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  v8::Locker locker(isolate);
  v8::HandleScope handle_scope(isolate);

  if (!error_message.empty()) {
    v8::Local<v8::Value> error = mate::ConvertToV8(isolate, error_message);
    callback.Run(error, v8::Null(isolate));
    return;
  }
  callback.Run(v8::Null(isolate), mate::ConvertToV8(isolate, cookie_list));
}

void RunRemoveCookiesCallbackOnUIThread(
    v8::Isolate* isolate,
    const std::string& error_message,
    const Cookies::CookiesCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  v8::Locker locker(isolate);
  v8::HandleScope handle_scope(isolate);

  if (!error_message.empty()) {
    v8::Local<v8::Value> error = mate::ConvertToV8(isolate, error_message);
    callback.Run(error, v8::Null(isolate));
    return;
  }

  callback.Run(v8::Null(isolate), v8::Null(isolate));
}

void RunSetCookiesCallbackOnUIThread(v8::Isolate* isolate,
                                     const std::string& error_message,
                                     bool set_success,
                                     const Cookies::CookiesCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  v8::Locker locker(isolate);
  v8::HandleScope handle_scope(isolate);

  if (!error_message.empty()) {
    v8::Local<v8::Value> error = mate::ConvertToV8(isolate, error_message);
    callback.Run(error, v8::Null(isolate));
    return;
  }
  if (!set_success) {
    v8::Local<v8::Value> error = mate::ConvertToV8(
        isolate, "Failed to set cookies");
    callback.Run(error, v8::Null(isolate));
  }

  callback.Run(v8::Null(isolate), v8::Null(isolate));
}

bool MatchesDomain(const base::DictionaryValue* filter,
                   const std::string& cookie_domain) {
  std::string filter_domain;
  if (!filter->GetString("domain", &filter_domain))
    return true;

  // Add a leading '.' character to the filter domain if it doesn't exist.
  if (net::cookie_util::DomainIsHostOnly(filter_domain))
    filter_domain.insert(0, ".");

  std::string sub_domain(cookie_domain);
  // Strip any leading '.' character from the input cookie domain.
  if (!net::cookie_util::DomainIsHostOnly(sub_domain))
    sub_domain = sub_domain.substr(1);

  // Now check whether the domain argument is a subdomain of the filter domain.
  for (sub_domain.insert(0, ".");
       sub_domain.length() >= filter_domain.length();) {
    if (sub_domain == filter_domain) {
      return true;
    }
    const size_t next_dot = sub_domain.find('.', 1);  // Skip over leading dot.
    sub_domain.erase(0, next_dot);
  }
  return false;
}

bool MatchesCookie(const base::DictionaryValue* filter,
                   const net::CanonicalCookie& cookie) {
  std::string name, domain, path;
  bool is_secure, session;
  if (filter->GetString("name", &name) && name != cookie.Name())
    return false;
  if (filter->GetString("path", &path) && path != cookie.Path())
    return false;
  if (!MatchesDomain(filter, cookie.Domain()))
    return false;
  if (filter->GetBoolean("secure", &is_secure) &&
      is_secure != cookie.IsSecure())
    return false;
  if (filter->GetBoolean("session", &session) &&
      session != cookie.IsPersistent())
    return false;
  return true;
}

}  // namespace

namespace mate {

template<>
struct Converter<net::CanonicalCookie> {
  static v8::Local<v8::Value> ToV8(v8::Isolate* isolate,
                                   const net::CanonicalCookie& val) {
    mate::Dictionary dict(isolate, v8::Object::New(isolate));
    dict.Set("name", val.Name());
    dict.Set("value", val.Value());
    dict.Set("domain", val.Domain());
    dict.Set("host_only", net::cookie_util::DomainIsHostOnly(val.Domain()));
    dict.Set("path", val.Path());
    dict.Set("secure", val.IsSecure());
    dict.Set("http_only", val.IsHttpOnly());
    dict.Set("session", val.IsPersistent());
    if (!val.IsPersistent())
      dict.Set("expirationDate", val.ExpiryDate().ToDoubleT());
    return dict.GetHandle();
  }
};

}  // namespace mate

namespace atom {

namespace api {

Cookies::Cookies(content::BrowserContext* browser_context)
    : request_context_getter_(browser_context->GetRequestContext()) {
}

Cookies::~Cookies() {
}

void Cookies::Get(const base::DictionaryValue& options,
                  const CookiesCallback& callback) {
  scoped_ptr<base::DictionaryValue> filter(
      options.DeepCopyWithoutEmptyChildren());

  content::BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
      base::Bind(&Cookies::GetCookiesOnIOThread, base::Unretained(this),
          Passed(&filter), callback));
}

void Cookies::GetCookiesOnIOThread(scoped_ptr<base::DictionaryValue> filter,
                                   const CookiesCallback& callback) {
  std::string url;
  filter->GetString("url", &url);
  if (!GetCookieListFromStore(GetCookieStore(), url,
          base::Bind(&Cookies::OnGetCookies, base::Unretained(this),
              Passed(&filter), callback))) {
    BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
        base::Bind(&RunGetCookiesCallbackOnUIThread, isolate(),
                   "Url is not valid", net::CookieList(), callback));
  }
}

void Cookies::OnGetCookies(scoped_ptr<base::DictionaryValue> filter,
                           const CookiesCallback& callback,
                           const net::CookieList& cookie_list) {
  net::CookieList result;
  for (const auto& cookie : cookie_list) {
    if (MatchesCookie(filter.get(), cookie))
      result.push_back(cookie);
  }
  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, base::Bind(
      &RunGetCookiesCallbackOnUIThread, isolate(), "", result, callback));
}

void Cookies::Remove(const mate::Dictionary& details,
                     const CookiesCallback& callback) {
  GURL url;
  std::string name;
  std::string error_message;
  if (!details.Get("url", &url) || !details.Get("name", &name)) {
    error_message = "Details(url, name) of removing cookie are required.";
  }
  if (error_message.empty() && !url.is_valid()) {
    error_message = "Url is not valid.";
  }
  if (!error_message.empty()) {
     RunRemoveCookiesCallbackOnUIThread(isolate(), error_message, callback);
     return;
  }
  content::BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
      base::Bind(&Cookies::RemoveCookiesOnIOThread, base::Unretained(this),
          url, name, callback));
}

void Cookies::RemoveCookiesOnIOThread(const GURL& url, const std::string& name,
                                      const CookiesCallback& callback) {
  GetCookieStore()->DeleteCookieAsync(url, name,
      base::Bind(&Cookies::OnRemoveCookies, base::Unretained(this), callback));
}

void Cookies::OnRemoveCookies(const CookiesCallback& callback) {
  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
      base::Bind(&RunRemoveCookiesCallbackOnUIThread, isolate(), "", callback));
}

void Cookies::Set(const base::DictionaryValue& options,
                  const CookiesCallback& callback) {
  std::string url;
  std::string error_message;
  if (!options.GetString("url", &url)) {
    error_message = "The url field is required.";
  }

  GURL gurl(url);
  if (error_message.empty() && !gurl.is_valid()) {
    error_message = "Url is not valid.";
  }

  if (!error_message.empty()) {
    RunSetCookiesCallbackOnUIThread(isolate(), error_message, false, callback);
    return;
  }

  scoped_ptr<base::DictionaryValue> details(
      options.DeepCopyWithoutEmptyChildren());

  content::BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
      base::Bind(&Cookies::SetCookiesOnIOThread, base::Unretained(this),
          Passed(&details), gurl, callback));
}

void Cookies::SetCookiesOnIOThread(scoped_ptr<base::DictionaryValue> details,
                                   const GURL& url,
                                   const CookiesCallback& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);

  std::string name, value, domain, path;
  bool secure = false;
  bool http_only = false;
  double expiration_date;

  details->GetString("name", &name);
  details->GetString("value", &value);
  details->GetString("domain", &domain);
  details->GetString("path", &path);
  details->GetBoolean("secure", &secure);
  details->GetBoolean("http_only", &http_only);

  base::Time expiration_time;
  if (details->GetDouble("expirationDate", &expiration_date)) {
    expiration_time = (expiration_date == 0) ?
        base::Time::UnixEpoch() :
        base::Time::FromDoubleT(expiration_date);
  }

  GetCookieStore()->GetCookieMonster()->SetCookieWithDetailsAsync(
      url,
      name,
      value,
      domain,
      path,
      expiration_time,
      secure,
      http_only,
      false,
      net::COOKIE_PRIORITY_DEFAULT,
      base::Bind(&Cookies::OnSetCookies, base::Unretained(this), callback));
}

void Cookies::OnSetCookies(const CookiesCallback& callback,
                           bool set_success) {
  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
      base::Bind(&RunSetCookiesCallbackOnUIThread, isolate(), "", set_success,
                 callback));
}

mate::ObjectTemplateBuilder Cookies::GetObjectTemplateBuilder(
    v8::Isolate* isolate) {
  return mate::ObjectTemplateBuilder(isolate)
      .SetMethod("get", &Cookies::Get)
      .SetMethod("remove", &Cookies::Remove)
      .SetMethod("set", &Cookies::Set);
}

net::CookieStore* Cookies::GetCookieStore() {
  return request_context_getter_->GetURLRequestContext()->cookie_store();
}

// static
mate::Handle<Cookies> Cookies::Create(
    v8::Isolate* isolate,
    content::BrowserContext* browser_context) {
  return mate::CreateHandle(isolate, new Cookies(browser_context));
}

}  // namespace api

}  // namespace atom
