Minigalnano/rss.php

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<?php
/*
* This file is part of MinigalNano: https://github.com/sebsauvage/MinigalNano
*
* MiniGal Nano is based on an original work by Thomas Rybak (© 2010)
*
* MinigalNano is licensed under the AGPL v3 (https://gnu.org/licenses/agpl-3.0.txt).
*/
/*============================*/
/* Gallery address definition */
/*============================*/
if (!empty($_SERVER['REQUEST_SCHEME'])) {
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$g_protocol = $_SERVER['REQUEST_SCHEME'];
} elseif (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
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$g_protocol = 'https';
} else {
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$g_protocol = 'http';
}
$g_host = $_SERVER['HTTP_HOST'];
$g_port = $_SERVER['SERVER_PORT'];
$g_path = dirname($_SERVER['REQUEST_URI']);
// remove default ports
if (($g_protocol == 'https' && $g_port == '443') ||
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($g_protocol == 'http' && $g_port == '80')) {
$g_port = '';
} else {
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$g_port = ':' . $g_port;
}
if ($g_path[0] != '/') {
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$g_path = '/' . $g_path;
}
$gallery_link = $g_protocol . '://' . $g_host . $g_port . $g_path;
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/*===================*/
/* Functions */
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/*===================*/
# Hardly inspired from here : codes-sources.commentcamarche.net/source/35937-creation-d-une-arborescenceI
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# Listing all files of a folder and sub folders.
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function listFiles(&$content, $folder, $keep_extensions, $SkipObjects) {
$dir = opendir($folder);
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// Loop on all contained on the folder
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while (false !== ($current = readdir($dir))) {
if ($current != '.' && $current != '..' && in_array($current, $SkipObjects) === false) {
if (is_dir($folder . '/' . $current)) {
ListFiles($content, $folder . '/' . $current, $keep_extensions, $SkipObjects);
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} else {
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$file_ext = strtolower(substr(strrchr($current, '.'), 1));
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// Should we display this extension ?
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if (in_array($file_ext, $keep_extensions)) {
$current_adress = $folder . '/' . $current;
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array_push($content, $current_adress);
}
}
}
}
closedir($dir);
return $content;
}
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# Paul's Simple Diff Algorithm v 0.1 : http://paulbutler.org/archives/a-simple-diff-algorithm-in-php/
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function diff($old, $new) {
$matrix = array();
$maxlen = 0;
foreach ($old as $oindex => $ovalue) {
$nkeys = array_keys($new, $ovalue);
foreach ($nkeys as $nindex) {
$matrix[$oindex][$nindex] = isset($matrix[$oindex - 1][$nindex - 1]) ?
$matrix[$oindex - 1][$nindex - 1] + 1 : 1;
if ($matrix[$oindex][$nindex] > $maxlen) {
$maxlen = $matrix[$oindex][$nindex];
$omax = $oindex + 1 - $maxlen;
$nmax = $nindex + 1 - $maxlen;
}
}
}
if ($maxlen == 0) {
return array(array('d' => $old, 'i' => $new));
}
return array_merge(
diff(array_slice($old, 0, $omax), array_slice($new, 0, $nmax)),
array_slice($new, $nmax, $maxlen),
diff(array_slice($old, $omax + $maxlen), array_slice($new, $nmax + $maxlen)));
}
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/*===================*/
/* Variables */
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/*===================*/
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require "config-default.php";
include "config.php";
$folder = "photos";
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$content = array();
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$content = listFiles($content, $folder, $keep_extensions, $skip_objects);
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usort($content, function ($a, $b) {return filemtime($a) < filemtime($b);});
if (is_writeable(".")) {
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$to_store = "";
$old_files_list = "db_old_files"; //list of files in ./photos
$db_feed_source = "db_feed_source";
$db_rss_timestamp = "db_rss_timestamp";
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// Init files
if (!file_exists($old_files_list)) {
file_put_contents($old_files_list, "");
}
if (!file_exists($db_feed_source)) {
file_put_contents($db_feed_source, "");
}
if (!file_exists($db_rss_timestamp)) {
file_put_contents($db_rss_timestamp, "");
}
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/*===================*/
/* Computing */
/*===================*/
#Todo : ajouter une condition : dois-je regénérer le flux ou utiliser les anciens fichiers ?
$temp = file_get_contents($db_feed_source);
$last_rss_gen = file_get_contents($db_rss_timestamp);
$current_time = time();
// If the RSS generation is already launched, don't do a second generation at the same time
if (($current_time - $last_rss_gen) > $rss_refresh_interval && file_exists("rss.locker") == false) {
file_put_contents("rss.locker", "");
file_put_contents($db_rss_timestamp, time());
// Load the list from files.
$old_files_list_content = explode("\n", file_get_contents($old_files_list));
$new_files_list_content = $content; #debug
// Generate and stock new elements
$differences = diff($old_files_list_content, $new_files_list_content);
for ($i = 0; $i < count($differences); $i++) {
if (is_array($differences[$i])) {
for ($j = 0; $j < count($differences[$i]["i"]); $j++) {
if (strlen($differences[$i]["i"][$j]) > 2) {
$to_store .= $differences[$i]["i"][$j] . "\n";
}
}
}
}
// Add new elements at the top of the feed's source
$temp = $to_store . $temp;
file_put_contents($db_feed_source, $temp);
// Store the current file list for the next generation
file_put_contents($old_files_list, join("/n", $content));
unlink("rss.locker");
}
$content = explode("\n", $temp);
}
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/*===================*/
/* XML Gen */
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/*===================*/
header('Content-Type: text/xml');
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echo "<?xml version='1.0' encoding='UTF-8'?>\n";
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echo "<rss version='2.0'>\n<channel>";
echo "<title>$title</title>";
echo "<link>$gallery_link</link>";
echo "<description>$description</description>\n";
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for ($i = 0; $i < $nb_items_rss && $i < count($content); $i++) {
if (empty($content[$i])) {
continue;
}
$link = $gallery_link . '/' . str_replace(' ', '%20', $content[$i]);
echo "<item>\n";
echo " <title>" . basename($link) . "</title>\n";
echo " <link>" . $link . "</link>\n";
echo " <guid>" . $link . "</guid>\n";
echo " <description><![CDATA[ <img src='" . $link . "'> ]]></description>\n";
echo " <pubDate>" . date("D, j M Y H:i:s O", filemtime($content[$i])) . "</pubDate>";
echo "</item>\n";
}
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echo "</channel></rss>\n";