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<?php
/*
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2006 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id: block-random.php 13338 2006-03-27 15:32:14Z jenst $
*/
/*
* This block selects a random photo for display. It will only display photos
* from albums that are visible to the public. It will not display hidden
* photos.
*
* Once a day (or whatever you set CACHE_EXPIRED to) we scan all albums and
* create a cache file listing each public album and the number of photos it
* contains. For all subsequent attempts we use that cache file. This means
* that if you change your albums around it may take a day before this block
* starts (or stops) displaying them.
*
* If your Gallery is embedded and you call it via an URL,
* make sure you are giving the needed paramters.
*
* *Nuke:
* http://<URL to your Nuke>/modules.php?op=modload&name=gallery&file=index&include=block-random.php
*
* Mambo / Joomla :
* http://<URL to Mambo>/index.php?option=com_gallery&Itemid=XXX
*/
// Random block does not require authentication of any sort... don't use sessions
$GALLERY_NO_SESSIONS = 1;
require(dirname(__FILE__) . "/init.php");
define('CACHE_FILE', $gallery->app->albumDir . "/block-random.dat");
define('CACHE_EXPIRED', $gallery->app->blockRandomCache);
// Check the cache file to see if it's up to date
$rebuild = 1;
if (fs_file_exists(CACHE_FILE)) {
$stat = fs_stat(CACHE_FILE);
$mtime = $stat[9];
if ((time() - $mtime) < CACHE_EXPIRED) {
$rebuild = 0;
}
}
if ($rebuild) {
scanAlbums();
saveGalleryBlockRandomCache();
} else {
readGalleryBlockRandomCache();
}
$i = 0;
do {
$success = doPhoto();
$i++;
} while (empty($success) && $i < $gallery->app->blockRandomAttempts);
if (empty($success)) {
echo _("No photo chosen.");
}
function doPhoto() {
$album = chooseAlbum();
if (!empty($album)) {
$index = choosePhoto($album);
}
if (!empty($index)) {
$id = $album->getPhotoId($index);
$caption = $album->getCaption($index) ? '<br>'. $album->getCaption($index) : '';
$photoUrl = makeAlbumUrl($album->fields['name'], $id);
$imageUrl = $album->getThumbnailTag($index);
$albumUrl = makeAlbumUrl($album->fields['name']);
$albumTitle = $album->fields['title'];
?>
<div class="random-block">
<div class="random-block-photo">
<a href="<?php echo $photoUrl; ?>"><?php echo $imageUrl; ?></a>
<?php echo $caption; ?>
</div>
<?php printf (_("From album: %s"), "<a href=\"$albumUrl\">$albumTitle</a>"); ?>
</div>
<?php
return 1;
} else {
return 0;
}
}
/*
* --------------------------------------------------
* Support functions
* --------------------------------------------------
*/
function saveGalleryBlockRandomCache() {
global $cache;
safe_serialize($cache, CACHE_FILE);
}
function readGalleryBlockRandomCache() {
global $cache;
$sCache = getFile(CACHE_FILE);
$cache = unserialize($sCache);
}
function choosePhoto($album) {
global $cache;
$count = $cache[$album->fields["name"]];
if ($count == 0) {
// Shouldn't happen
return null;
} elseif ($count == 1) {
$choose = 1;
if ($album->isAlbum($choose)) {
return null;
}
} else {
$choose = mt_rand(1, $count);
$wrap = 0;
while ($album->isHiddenRecurse($choose) || $album->isAlbum($choose)) {
$choose++;
if ($choose > $album->numPhotos(1)) {
$choose = 1;
$wrap++;
if ($wrap == 2) {
return null;
}
}
}
}
return $choose;
}
function chooseAlbum() {
global $cache;
/*
* The odds that an album will be selected is proportional
* to the number of (visible) items in the album.
*/
$total = 0;
foreach ($cache as $name => $count) {
if (empty($choose)) {
$choose = $name;
}
$total += $count;
if ($total != 0 && ($total == 1 || mt_rand(1, $total) <= $count)) {
$choose = $name;
}
}
if ($choose) {
$album = new Album();
$album->load($choose);
return $album;
} else {
return null;
}
}
function scanAlbums() {
global $cache;
global $gallery;
$cache = array();
$everybody = $gallery->userDB->getEverybody();
$albumDB = new AlbumDB();
foreach ($albumDB->albumList as $tmpAlbum) {
if ($tmpAlbum->canReadRecurse($everybody->getUid()) && !$tmpAlbum->isHiddenRecurse()) {
$seeHidden = $everybody->canWriteToAlbum($tmpAlbum);
$numPhotos = $tmpAlbum->numPhotos($seeHidden);
$name = $tmpAlbum->fields["name"];
if ($numPhotos > 0) {
$cache[$name] = $numPhotos;
}
}
}
}
?>
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