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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "nsISupports.idl"

interface nsIURI;
interface nsIPrincipal;
interface mozIPlacesPendingOperation;
interface nsIFaviconDataCallback;

[scriptable, uuid(e81e0b0c-b9f1-4c2e-8f3c-b809933cf73c)]
interface nsIFaviconService : nsISupports
{
  // The favicon is being loaded from a private browsing window
  const unsigned long FAVICON_LOAD_PRIVATE = 1;
  // The favicon is being loaded from a non-private browsing window
  const unsigned long FAVICON_LOAD_NON_PRIVATE = 2;

  /**
   * The limit in bytes of the size of favicons in memory and passed via the
   * favicon protocol.
   */
  const unsigned long MAX_FAVICON_BUFFER_SIZE = 65536;

  /**
   * For a given icon URI, this will return a URI that will result in the image.
   * In most cases, this is an annotation URI.  For chrome URIs, this will do
   * nothing but returning the input URI.
   *
   * No validity checking is done. If you pass an icon URI that we've never
   * seen, you'll get back a URI that references an invalid icon. The moz-anno
   * protocol handler's special case for "favicon" annotations will resolve
   * invalid icons to the default icon, although without caching.
   * For invalid chrome URIs, you'll get a broken image.
   *
   * @param aFaviconURI
   *        The URI of an icon in the favicon service.
   * @return A URI that will give you the icon image.  This is NOT the URI of
   *         the icon as set on the page, but a URI that will give you the
   *         data out of the favicon service.  For a normal page with a
   *         favicon we've stored, this will be an annotation URI which will
   *         then cause the corresponding favicon data to be loaded async from
   *         this service.  For pages where we don't have a favicon, this will
   *         be a chrome URI of the default icon. For chrome URIs, the
   *         output will be the same as the input.
   */
  nsIURI getFaviconLinkForIcon(in nsIURI aFaviconURI);

  /**
   * Expire all known favicons from the database.
   *
   * @note This is an async method.
   *       On successful completion a "places-favicons-expired" notification is
   *       dispatched through observer's service.
   */
  void expireAllFavicons();

  /**
   * Sets the default size returned by preferredSizeFromURI when the uri doesn't
   * specify a size ref. If this is not invoked first, or 0 is passed to it,
   * preferredSizeFromURI() will return UINT16_MAX, that matches the biggest
   * icon available.
   */
  void setDefaultIconURIPreferredSize(in unsigned short aDefaultSize);

  /**
   * Tries to extract the preferred size from an icon uri ref fragment.
   *
   * @param aURI
   *        The URI to parse.
   * @return The preferred size, or a default size set through
   *         setDefaultIconURIPreferredSize, or UINT16_MAX if neither are set.
   */
  unsigned short preferredSizeFromURI(in nsIURI aURI);

  /**
   * The default favicon URI
   */
  readonly attribute nsIURI defaultFavicon;

  /**
   * The default favicon mimeType
   */
  readonly attribute AUTF8String defaultFaviconMimeType;

  /**
   * Declares that a given page uses a favicon with the given URI and
   * attempts to fetch and save the icon data by loading the favicon URI
   * through an async network request.
   *
   * If the icon data already exists, we won't try to reload the icon unless
   * aForceReload is true.  Similarly, if the icon is in the failed favicon
   * cache we won't do anything unless aForceReload is true, in which case
   * we'll try to reload the favicon.
   *
   * This function will only save favicons for pages that are already stored in
   * the database, like visited pages or bookmarks.  For any other URIs, it
   * will succeed but do nothing.  This function will also ignore the error
   * page favicon URI (see FAVICON_ERRORPAGE_URL below).
   *
   * Icons that fail to load will automatically be added to the failed favicon
   * cache, and this function will not save favicons for non-bookmarked URIs
   * when history is disabled.
   *
   * @note This function is identical to
   *       nsIFaviconService::setAndLoadFaviconForPage.
   *
   * @param aPageURI
   *        URI of the page whose favicon is being set.
   * @param aFaviconURI
   *        URI of the favicon to associate with the page.
   * @param aForceReload
   *        If aForceReload is false, we try to reload the favicon only if we
   *        don't have it or it has expired from the cache.  Setting
   *        aForceReload to true causes us to reload the favicon even if we
   *        have a usable copy.
   * @param aFaviconLoadType
   *        Set to FAVICON_LOAD_PRIVATE if the favicon is loaded from a private
   *        browsing window.  Set to FAVICON_LOAD_NON_PRIVATE otherwise.
   * @param [optional] aCallback
   *        Once we're done setting and/or fetching the favicon, we invoke this
   *        callback.
   * @param [optional] aLoadingPrincipal
   *        Principal of the page whose favicon is being set. If this argument
   *        is omitted, the loadingPrincipal defaults to the nullPrincipal.
   * @param [optional] aRequestContextID
   *        used to inform Necko of how to link the
   *        favicon request with other requests in the same tab.
   *
   * @see nsIFaviconDataCallback in nsIFaviconService.idl.
   */
  mozIPlacesPendingOperation setAndFetchFaviconForPage(
    in nsIURI aPageURI,
    in nsIURI aFaviconURI,
    in boolean aForceReload,
    in unsigned long aFaviconLoadType,
    [optional] in nsIFaviconDataCallback aCallback,
    [optional] in nsIPrincipal aLoadingPrincipal,
    [optional] in unsigned long long aRequestContextID);

  /**
   * Sets the data for a given favicon URI either by replacing existing data in
   * the database or taking the place of otherwise fetched icon data when
   * calling setAndFetchFaviconForPage later.
   *
   * Favicon data for favicon URIs that are not associated with a page URI via
   * setAndFetchFaviconForPage will be stored in memory, but may be expired at
   * any time, so you should make an effort to associate favicon URIs with page
   * URIs as soon as possible.
   *
   * It's better to not use this function for chrome: icon URIs since you can
   * reference the chrome image yourself. getFaviconLinkForIcon/Page will ignore
   * any associated data if the favicon URI is "chrome:" and just return the
   * same chrome URI.
   *
   * This function does NOT send out notifications that the data has changed.
   * Pages using this favicons that are visible in history or bookmarks views
   * will keep the old icon until they have been refreshed by other means.
   *
   * This function tries to optimize the favicon size, if it is bigger
   * than a defined limit we will try to convert it to a 16x16 png image.
   * If the conversion fails and favicon is still bigger than our max accepted
   * size it won't be saved.
   *
   * @param aFaviconURI
   *        URI of the favicon whose data is being set.
   * @param aData
   *        Binary contents of the favicon to save
   * @param aMimeType
   *        MIME type of the data to store.  This is important so that we know
   *        what to report when the favicon is used.  You should always set this
   *        param unless you are clearing an icon.
   * @param [optional] aExpiration
   *        Time in microseconds since the epoch when this favicon expires.
   *        Until this time, we won't try to load it again.
   * @throws NS_ERROR_FAILURE
   *         Thrown if the favicon is overbloated and won't be saved to the db.
   */
  void replaceFaviconData(in nsIURI aFaviconURI,
                          in Array<octet> aData,
                          in AUTF8String aMimeType,
                          [optional] in PRTime aExpiration);

  /**
   * Same as replaceFaviconData but the data is provided by a string
   * containing a data URL.
   *
   * @see replaceFaviconData
   *
   * @param aFaviconURI
   *        URI of the favicon whose data is being set.
   * @param aDataURL
   *        string containing a data URL that represents the contents of
   *        the favicon to save
   * @param [optional] aExpiration
   *        Time in microseconds since the epoch when this favicon expires.
   *        Until this time, we won't try to load it again.
   * @param [optional] aLoadingPrincipal
   *        Principal of the page whose favicon is being set. If this argument
   *        is omitted, the loadingPrincipal defaults to the nullPrincipal.
   * @throws NS_ERROR_FAILURE
   *         Thrown if the favicon is overbloated and won't be saved to the db.
   */
  void replaceFaviconDataFromDataURL(in nsIURI aFaviconURI,
                                     in AString aDataURL,
                                     [optional] in PRTime aExpiration,
                                     [optional] in nsIPrincipal aLoadingPrincipal);

  /**
   * Retrieves the favicon URI associated to the given page, if any.
   *
   * @param aPageURI
   *        URI of the page whose favicon URI we're looking up.
   * @param aCallback
   *        This callback is always invoked to notify the result of the lookup.
   *        The aURI parameter will be the favicon URI, or null when no favicon
   *        is associated with the page or an error occurred while fetching it.
   *        aDataLen will be always 0, aData will be an empty array, and
   *        aMimeType will be an empty string, regardless of whether a favicon
   *        was found.
   * @param [optional] aPreferredWidth
   *        The preferred icon width, 0 for the biggest available.
   *
   * @note If a favicon specific to this page cannot be found, this will try to
   *       fallback to the /favicon.ico for the root domain.
   *
   * @see nsIFaviconDataCallback in nsIFaviconService.idl.
   */
  void getFaviconURLForPage(in nsIURI aPageURI,
                            in nsIFaviconDataCallback aCallback,
                            [optional] in unsigned short aPreferredWidth);

  /**
   * Retrieves the favicon URI and data associated to the given page, if any.
   * If the page icon is not available, it will try to return the root domain
   * icon data, when it's known.
   *
   * @param aPageURI
   *        URI of the page whose favicon URI and data we're looking up.
   * @param aCallback
   *        This callback is always invoked to notify the result of the lookup.  The aURI
   *        parameter will be the favicon URI, or null when no favicon is
   *        associated with the page or an error occurred while fetching it.  If
   *        aURI is not null, the other parameters may contain the favicon data.
   *        However, if no favicon data is currently associated with the favicon
   *        URI, aDataLen will be 0, aData will be an empty array, and aMimeType
   *        will be an empty string.
   * @param [optional] aPreferredWidth
   *        The preferred icon width, 0 for the biggest available.
   * @note If a favicon specific to this page cannot be found, this will try to
   *       fallback to the /favicon.ico for the root domain.
   *
   * @see nsIFaviconDataCallback in nsIFaviconService.idl.
   */
  void getFaviconDataForPage(in nsIURI aPageURI,
                             in nsIFaviconDataCallback aCallback,
                             [optional] in unsigned short aPreferredWidth);

  /**
   * Copies cached favicons from a page to another one.
   *
   * @param aFromPageURI
   *        URI of the originating page.
   * @param aToPageURI
   *        URI of the destination page.
   * @param aFaviconLoadType
   *        Set to FAVICON_LOAD_PRIVATE if the copy is started from a private
   *        browsing window.  Set to FAVICON_LOAD_NON_PRIVATE otherwise.
   * @param [optional] aCallback
   *        Once we're done copying the favicon, we invoke this callback.
   *        If a copy has been done, the callback will report one of the
   *        favicons uri as aFaviconURI, otherwise all the params will be null.
   */
  void copyFavicons(in nsIURI aFromPageURI,
                    in nsIURI aToPageURI,
                    in unsigned long aFaviconLoadType,
                    [optional] in nsIFaviconDataCallback aCallback);
};

[scriptable, function, uuid(c85e5c82-b70f-4621-9528-beb2aa47fb44)]
interface nsIFaviconDataCallback : nsISupports
{
  /**
   * Called when the required favicon's information is available.
   *
   * It's up to the invoking method to state if the callback is always invoked,
   * or called on success only.  Check the method documentation to ensure that.
   *
   * The caller will receive the most information we can gather on the icon,
   * but it's not guaranteed that all of them will be set.  For some method
   * we could not know the favicon's data (it could just be too expensive to
   * get it, or the method does not require we actually have any data).
   * It's up to the caller to check aDataLen > 0 before using any data-related
   * information like mime-type or data itself.
   *
   * @param aFaviconURI
   *        Receives the "favicon URI" (not the "favicon link URI") associated
   *        to the requested page.  This can be null if there is no associated
   *        favicon URI, or the callback is notifying a failure.
   * @param aDataLen
   *        Size of the icon data in bytes.  Notice that a value of 0 does not
   *        necessarily mean that we don't have an icon.
   * @param aData
   *        Icon data, or an empty array if aDataLen is 0.
   * @param aMimeType
   *        Mime type of the icon, or an empty string if aDataLen is 0.
   * @param aWidth
   *        Width of the icon. 0 if the width is unknown or if the icon is
   *        vectorial.
   *
   * @note If you want to open a network channel to access the favicon, it's
   *       recommended that you call the getFaviconLinkForIcon method to convert
   *       the "favicon URI" into a "favicon link URI".
   */
  void onComplete(in nsIURI aFaviconURI,
                  in unsigned long aDataLen,
                  [const,array,size_is(aDataLen)] in octet aData,
                  in AUTF8String aMimeType,
                  in unsigned short aWidth);
};

%{C++

/**
 * Notification sent when all favicons are expired.
 */
#define NS_PLACES_FAVICONS_EXPIRED_TOPIC_ID "places-favicons-expired"

#define FAVICON_DEFAULT_URL "chrome://mozapps/skin/places/defaultFavicon.svg"
#define FAVICON_DEFAULT_MIMETYPE "image/svg+xml"

#define FAVICON_ERRORPAGE_URL "chrome://global/skin/icons/warning.svg"

%}