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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "FaviconHelpers.h"

#include "nsICacheEntry.h"
#include "nsICachingChannel.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsIPrincipal.h"

#include "nsNavHistory.h"
#include "nsFaviconService.h"
#include "mozilla/storage.h"
#include "mozilla/Telemetry.h"
#include "nsNetUtil.h"
#include "nsPrintfCString.h"
#include "nsStreamUtils.h"
#include "nsIPrivateBrowsingChannel.h"
#include "nsISupportsPriority.h"
#include "nsContentUtils.h"
#include <algorithm>

using namespace mozilla::places;
using namespace mozilla::storage;

namespace mozilla {
namespace places {

namespace {

/**
 * Fetches information on a page from the Places database.
 *
 * @param aDBConn
 *        Database connection to history tables.
 * @param _page
 *        Page that should be fetched.
 */
nsresult
FetchPageInfo(const RefPtr<Database>& aDB,
              PageData& _page)
{
  MOZ_ASSERT(_page.spec.Length(), "Must have a non-empty spec!");
  MOZ_ASSERT(!NS_IsMainThread());

  // This query finds the bookmarked uri we want to set the icon for,
  // walking up to two redirect levels.
  nsCString query = nsPrintfCString(
    "SELECT h.id, h.favicon_id, h.guid, ( "
      "SELECT h.url FROM moz_bookmarks b WHERE b.fk = h.id "
      "UNION ALL " // Union not directly bookmarked pages.
      "SELECT url FROM moz_places WHERE id = ( "
        "SELECT COALESCE(grandparent.place_id, parent.place_id) as r_place_id "
        "FROM moz_historyvisits dest "
        "LEFT JOIN moz_historyvisits parent ON parent.id = dest.from_visit "
                                          "AND dest.visit_type IN (%d, %d) "
        "LEFT JOIN moz_historyvisits grandparent ON parent.from_visit = grandparent.id "
          "AND parent.visit_type IN (%d, %d) "
        "WHERE dest.place_id = h.id "
        "AND EXISTS(SELECT 1 FROM moz_bookmarks b WHERE b.fk = r_place_id) "
        "LIMIT 1 "
      ") "
    ") FROM moz_places h WHERE h.url_hash = hash(:page_url) AND h.url = :page_url",
    nsINavHistoryService::TRANSITION_REDIRECT_PERMANENT,
    nsINavHistoryService::TRANSITION_REDIRECT_TEMPORARY,
    nsINavHistoryService::TRANSITION_REDIRECT_PERMANENT,
    nsINavHistoryService::TRANSITION_REDIRECT_TEMPORARY
  );

  nsCOMPtr<mozIStorageStatement> stmt = aDB->GetStatement(query);
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"),
                                _page.spec);
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasResult;
  rv = stmt->ExecuteStep(&hasResult);
  NS_ENSURE_SUCCESS(rv, rv);
  if (!hasResult) {
    // The page does not exist.
    return NS_ERROR_NOT_AVAILABLE;
  }

  rv = stmt->GetInt64(0, &_page.id);
  NS_ENSURE_SUCCESS(rv, rv);
  bool isNull;
  rv = stmt->GetIsNull(1, &isNull);
  NS_ENSURE_SUCCESS(rv, rv);
  // favicon_id can be nullptr.
  if (!isNull) {
    rv = stmt->GetInt64(1, &_page.iconId);
    NS_ENSURE_SUCCESS(rv, rv);
  }
  rv = stmt->GetUTF8String(2, _page.guid);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->GetIsNull(3, &isNull);
  NS_ENSURE_SUCCESS(rv, rv);
  // The page could not be bookmarked.
  if (!isNull) {
    rv = stmt->GetUTF8String(3, _page.bookmarkedSpec);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  if (!_page.canAddToHistory) {
    // Either history is disabled or the scheme is not supported.  In such a
    // case we want to update the icon only if the page is bookmarked.

    if (_page.bookmarkedSpec.IsEmpty()) {
      // The page is not bookmarked.  Since updating the icon with a disabled
      // history would be a privacy leak, bail out as if the page did not exist.
      return NS_ERROR_NOT_AVAILABLE;
    }
    else {
      // The page, or a redirect to it, is bookmarked.  If the bookmarked spec
      // is different from the requested one, use it.
      if (!_page.bookmarkedSpec.Equals(_page.spec)) {
        _page.spec = _page.bookmarkedSpec;
        rv = FetchPageInfo(aDB, _page);
        NS_ENSURE_SUCCESS(rv, rv);
      }
    }
  }

  return NS_OK;
}

/**
 * Stores information on a icon in the database.
 *
 * @param aDBConn
 *        Database connection to history tables.
 * @param aIcon
 *        Icon that should be stored.
 */
nsresult
SetIconInfo(const RefPtr<Database>& aDB,
            const IconData& aIcon)
{
  MOZ_ASSERT(!NS_IsMainThread());

  nsCOMPtr<mozIStorageStatement> stmt = aDB->GetStatement(
    "INSERT OR REPLACE INTO moz_favicons "
      "(id, url, data, mime_type, expiration) "
    "VALUES ((SELECT id FROM moz_favicons WHERE url = :icon_url), "
            ":icon_url, :data, :mime_type, :expiration) "
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);
  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("icon_url"), aIcon.spec);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindBlobByName(NS_LITERAL_CSTRING("data"),
                            TO_INTBUFFER(aIcon.data), aIcon.data.Length());
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindUTF8StringByName(NS_LITERAL_CSTRING("mime_type"), aIcon.mimeType);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = stmt->BindInt64ByName(NS_LITERAL_CSTRING("expiration"), aIcon.expiration);
  NS_ENSURE_SUCCESS(rv, rv);

  rv = stmt->Execute();
  NS_ENSURE_SUCCESS(rv, rv);

  return NS_OK;
}

/**
 * Fetches information on a icon from the Places database.
 *
 * @param aDBConn
 *        Database connection to history tables.
 * @param _icon
 *        Icon that should be fetched.
 */
nsresult
FetchIconInfo(const RefPtr<Database>& aDB,
              IconData& _icon)
{
  MOZ_ASSERT(_icon.spec.Length(), "Must have a non-empty spec!");
  MOZ_ASSERT(!NS_IsMainThread());

  if (_icon.status & ICON_STATUS_CACHED) {
    return NS_OK;
  }

  nsCOMPtr<mozIStorageStatement> stmt = aDB->GetStatement(
    "SELECT id, expiration, data, mime_type "
    "FROM moz_favicons WHERE url = :icon_url"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  DebugOnly<nsresult> rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("icon_url"),
                                           _icon.spec);
  MOZ_ASSERT(NS_SUCCEEDED(rv));

  bool hasResult;
  rv = stmt->ExecuteStep(&hasResult);
  MOZ_ASSERT(NS_SUCCEEDED(rv));
  if (!hasResult) {
    // The icon does not exist yet, bail out.
    return NS_OK;
  }

  rv = stmt->GetInt64(0, &_icon.id);
  MOZ_ASSERT(NS_SUCCEEDED(rv));

  // Expiration can be nullptr.
  bool isNull;
  rv = stmt->GetIsNull(1, &isNull);
  MOZ_ASSERT(NS_SUCCEEDED(rv));
  if (!isNull) {
    rv = stmt->GetInt64(1, reinterpret_cast<int64_t*>(&_icon.expiration));
    MOZ_ASSERT(NS_SUCCEEDED(rv));
  }

  // Data can be nullptr.
  rv = stmt->GetIsNull(2, &isNull);
  MOZ_ASSERT(NS_SUCCEEDED(rv));
  if (!isNull) {
    uint8_t* data;
    uint32_t dataLen = 0;
    rv = stmt->GetBlob(2, &dataLen, &data);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
    _icon.data.Adopt(TO_CHARBUFFER(data), dataLen);
    // Read mime only if we have data.
    rv = stmt->GetUTF8String(3, _icon.mimeType);
    MOZ_ASSERT(NS_SUCCEEDED(rv));
  }

  return NS_OK;
}

nsresult
FetchIconURL(const RefPtr<Database>& aDB,
             const nsACString& aPageSpec,
             nsACString& aIconSpec)
{
  MOZ_ASSERT(!aPageSpec.IsEmpty(), "Page spec must not be empty.");
  MOZ_ASSERT(!NS_IsMainThread());

  aIconSpec.Truncate();

  nsCOMPtr<mozIStorageStatement> stmt = aDB->GetStatement(
    "SELECT f.url "
    "FROM moz_places h "
    "JOIN moz_favicons f ON h.favicon_id = f.id "
    "WHERE h.url_hash = hash(:page_url) AND h.url = :page_url"
  );
  NS_ENSURE_STATE(stmt);
  mozStorageStatementScoper scoper(stmt);

  nsresult rv = URIBinder::Bind(stmt, NS_LITERAL_CSTRING("page_url"),
                                aPageSpec);
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasResult;
  if (NS_SUCCEEDED(stmt->ExecuteStep(&hasResult)) && hasResult) {
    rv = stmt->GetUTF8String(0, aIconSpec);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return NS_OK;
}

/**
 * Tries to compute the expiration time for a icon from the channel.
 *
 * @param aChannel
 *        The network channel used to fetch the icon.
 * @return a valid expiration value for the fetched icon.
 */
PRTime
GetExpirationTimeFromChannel(nsIChannel* aChannel)
{
  MOZ_ASSERT(NS_IsMainThread());

  // Attempt to get an expiration time from the cache.  If this fails, we'll
  // make one up.
  PRTime expiration = -1;
  nsCOMPtr<nsICachingChannel> cachingChannel = do_QueryInterface(aChannel);
  if (cachingChannel) {
    nsCOMPtr<nsISupports> cacheToken;
    nsresult rv = cachingChannel->GetCacheToken(getter_AddRefs(cacheToken));
    if (NS_SUCCEEDED(rv)) {
      nsCOMPtr<nsICacheEntry> cacheEntry = do_QueryInterface(cacheToken);
      uint32_t seconds;
      rv = cacheEntry->GetExpirationTime(&seconds);
      if (NS_SUCCEEDED(rv)) {
        // Set the expiration, but make sure we honor our cap.
        expiration = PR_Now() + std::min((PRTime)seconds * PR_USEC_PER_SEC,
                                       MAX_FAVICON_EXPIRATION);
      }
    }
  }
  // If we did not obtain a time from the cache, use the cap value.
  return expiration < 0 ? PR_Now() + MAX_FAVICON_EXPIRATION
                        : expiration;
}

/**
 * Checks the icon and evaluates if it needs to be optimized.  In such a case it
 * will try to reduce its size through OptimizeFaviconImage method of the
 * favicons service.
 *
 * @param aIcon
 *        The icon to be evaluated.
 * @param aFaviconSvc
 *        Pointer to the favicons service.
 */
nsresult
OptimizeIconSize(IconData& aIcon,
                 nsFaviconService* aFaviconSvc)
{
  MOZ_ASSERT(NS_IsMainThread());

  // Even if the page provides a large image for the favicon (eg, a highres
  // image or a multiresolution .ico file), don't try to store more data than
  // needed.
  nsAutoCString newData, newMimeType;
  if (aIcon.data.Length() > MAX_FAVICON_FILESIZE) {
    nsresult rv = aFaviconSvc->OptimizeFaviconImage(TO_INTBUFFER(aIcon.data),
                                                    aIcon.data.Length(),
                                                    aIcon.mimeType,
                                                    newData,
                                                    newMimeType);
    if (NS_SUCCEEDED(rv) && newData.Length() < aIcon.data.Length()) {
      aIcon.data = newData;
      aIcon.mimeType = newMimeType;
    }
  }
  return NS_OK;
}

} // namespace

////////////////////////////////////////////////////////////////////////////////
//// AsyncFetchAndSetIconForPage

NS_IMPL_ISUPPORTS_INHERITED(
  AsyncFetchAndSetIconForPage
, Runnable
, nsIStreamListener
, nsIInterfaceRequestor
, nsIChannelEventSink
, mozIPlacesPendingOperation
)

AsyncFetchAndSetIconForPage::AsyncFetchAndSetIconForPage(
  IconData& aIcon
, PageData& aPage
, bool aFaviconLoadPrivate
, nsIFaviconDataCallback* aCallback
, nsIPrincipal* aLoadingPrincipal
) : mCallback(new nsMainThreadPtrHolder<nsIFaviconDataCallback>(aCallback))
  , mIcon(aIcon)
  , mPage(aPage)
  , mFaviconLoadPrivate(aFaviconLoadPrivate)
  , mLoadingPrincipal(new nsMainThreadPtrHolder<nsIPrincipal>(aLoadingPrincipal))
  , mCanceled(false)
{
  MOZ_ASSERT(NS_IsMainThread());
}

NS_IMETHODIMP
AsyncFetchAndSetIconForPage::Run()
{
  MOZ_ASSERT(!NS_IsMainThread());

  // Try to fetch the icon from the database.
  RefPtr<Database> DB = Database::GetDatabase();
  NS_ENSURE_STATE(DB);
  nsresult rv = FetchIconInfo(DB, mIcon);
  NS_ENSURE_SUCCESS(rv, rv);

  bool isInvalidIcon = mIcon.data.IsEmpty() ||
                       (mIcon.expiration && PR_Now() > mIcon.expiration);
  bool fetchIconFromNetwork = mIcon.fetchMode == FETCH_ALWAYS ||
                              (mIcon.fetchMode == FETCH_IF_MISSING && isInvalidIcon);

  if (!fetchIconFromNetwork) {
    // There is already a valid icon or we don't want to fetch a new one,
    // directly proceed with association.
    RefPtr<AsyncAssociateIconToPage> event =
        new AsyncAssociateIconToPage(mIcon, mPage, mCallback);
    DB->DispatchToAsyncThread(event);

    return NS_OK;
  }

  // Fetch the icon from the network, the request starts from the main-thread.
  // When done this will associate the icon to the page and notify.
  nsCOMPtr<nsIRunnable> event =
    NewRunnableMethod(this, &AsyncFetchAndSetIconForPage::FetchFromNetwork);
  return NS_DispatchToMainThread(event);
}

nsresult
AsyncFetchAndSetIconForPage::FetchFromNetwork() {
  MOZ_ASSERT(NS_IsMainThread());

  if (mCanceled) {
    return NS_OK;
  }

  // Ensure data is cleared, since it's going to be overwritten.
  if (mIcon.data.Length() > 0) {
    mIcon.data.Truncate(0);
    mIcon.mimeType.Truncate(0);
  }

  nsCOMPtr<nsIURI> iconURI;
  nsresult rv = NS_NewURI(getter_AddRefs(iconURI), mIcon.spec);
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIChannel> channel;
  rv = NS_NewChannel(getter_AddRefs(channel),
                     iconURI,
                     mLoadingPrincipal,
                     nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS |
                     nsILoadInfo::SEC_ALLOW_CHROME |
                     nsILoadInfo::SEC_DISALLOW_SCRIPT,
                     nsIContentPolicy::TYPE_INTERNAL_IMAGE_FAVICON);

  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIInterfaceRequestor> listenerRequestor =
    do_QueryInterface(reinterpret_cast<nsISupports*>(this));
  NS_ENSURE_STATE(listenerRequestor);
  rv = channel->SetNotificationCallbacks(listenerRequestor);
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIPrivateBrowsingChannel> pbChannel = do_QueryInterface(channel);
  if (pbChannel) {
    rv = pbChannel->SetPrivate(mFaviconLoadPrivate);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsCOMPtr<nsISupportsPriority> priorityChannel = do_QueryInterface(channel);
  if (priorityChannel) {
    priorityChannel->AdjustPriority(nsISupportsPriority::PRIORITY_LOWEST);
  }

  rv = channel->AsyncOpen2(this);
  if (NS_SUCCEEDED(rv)) {
    mRequest = channel;
  }
  return rv;
}

NS_IMETHODIMP
AsyncFetchAndSetIconForPage::Cancel()
{
  MOZ_ASSERT(NS_IsMainThread());
  if (mCanceled) {
    return NS_ERROR_UNEXPECTED;
  }
  mCanceled = true;
  if (mRequest) {
    mRequest->Cancel(NS_BINDING_ABORTED);
  }
  return NS_OK;
}

NS_IMETHODIMP
AsyncFetchAndSetIconForPage::OnStartRequest(nsIRequest* aRequest,
                                            nsISupports* aContext)
{
  // mRequest should already be set from ::FetchFromNetwork, but in the case of
  // a redirect we might get a new request, and we should make sure we keep a
  // reference to the most current request.
  mRequest = aRequest;
  if (mCanceled) {
    mRequest->Cancel(NS_BINDING_ABORTED);
  }
  return NS_OK;
}

NS_IMETHODIMP
AsyncFetchAndSetIconForPage::OnDataAvailable(nsIRequest* aRequest,
                                             nsISupports* aContext,
                                             nsIInputStream* aInputStream,
                                             uint64_t aOffset,
                                             uint32_t aCount)
{
  const size_t kMaxFaviconDownloadSize = 1 * 1024 * 1024;
  if (mIcon.data.Length() + aCount > kMaxFaviconDownloadSize) {
    mIcon.data.Truncate();
    return NS_ERROR_FILE_TOO_BIG;
  }

  nsAutoCString buffer;
  nsresult rv = NS_ConsumeStream(aInputStream, aCount, buffer);
  if (rv != NS_BASE_STREAM_WOULD_BLOCK && NS_FAILED(rv)) {
    return rv;
  }

  if (!mIcon.data.Append(buffer, fallible)) {
    mIcon.data.Truncate();
    return NS_ERROR_OUT_OF_MEMORY;
  }

  return NS_OK;
}


NS_IMETHODIMP
AsyncFetchAndSetIconForPage::GetInterface(const nsIID& uuid,
                                          void** aResult)
{
  return QueryInterface(uuid, aResult);
}


NS_IMETHODIMP
AsyncFetchAndSetIconForPage::AsyncOnChannelRedirect(
  nsIChannel*