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universal image caching and automatic cache directories maintenance

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This commit is contained in:
Andrew Dolgov
2011-12-26 13:11:08 +04:00
parent 7a5d9b95c4
commit 3c696512fc
7 changed files with 110 additions and 44 deletions
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81
include/rssfuncs.php
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@@ -136,6 +136,8 @@
WHERE id IN (%s)", implode(',', $feed_ids)));
}
expire_cached_files($debug);
// For each feed, we call the feed update function.
while ($line = array_pop($feeds_to_update)) {
@@ -364,15 +366,6 @@
$rss->set_output_encoding('UTF-8');
$rss->force_feed(true);
if (SIMPLEPIE_CACHE_IMAGES && $cache_images) {
if ($debug_enabled) {
_debug("enabling image cache");
}
$rss->set_image_handler("image.php", 'i');
}
if ($debug_enabled) {
_debug("feed update interval (sec): " .
get_feed_update_interval($link, $feed)*60);
@@ -685,9 +678,13 @@
}
}
if ($cache_images)
$entry_content = cache_images($entry_content, $site_url, $debug_enabled);
if ($_REQUEST["xdebug"] == 2) {
print "update_rss_feed: content: ";
print_r(htmlspecialchars($entry_content));
print "\n";
}
$entry_content_unescaped = $entry_content;
@@ -735,7 +732,7 @@
$entry_content = db_escape_string($entry_content, false);
$content_hash = "SHA1:" . sha1(strip_tags($entry_content));
$content_hash = "SHA1:x" . sha1(strip_tags($entry_content));
$entry_title = db_escape_string($entry_title);
$entry_link = db_escape_string($entry_link);
@@ -1311,7 +1308,71 @@
}
function cache_images($html, $site_url, $debug) {
$cache_dir = CACHE_DIR . "/images";
libxml_use_internal_errors(true);
$charset_hack = '<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>';
$doc = new DOMDocument();
$doc->loadHTML($charset_hack . $html);
$xpath = new DOMXPath($doc);
$entries = $xpath->query('(//img[@src])');
foreach ($entries as $entry) {
if ($entry->hasAttribute('src')) {
$src = rewrite_relative_url($site_url, $entry->getAttribute('src'));
$local_filename = CACHE_DIR . "/images/" . sha1($src) . ".png";
if ($debug) _debug("cache_images: downloading: $src to $local_filename");
if (!file_exists($local_filename)) {
$file_content = fetch_file_contents($src);
if ($file_content) {
file_put_contents($local_filename, $file_content);
}
}
if (file_exists($local_filename)) {
$entry->setAttribute('src', SELF_URL_PATH . '/image.php?url=' .
htmlspecialchars($src));
}
}
}
$node = $doc->getElementsByTagName('body')->item(0);
return $doc->saveXML($node);
}
function expire_cached_files($debug) {
foreach (array("magpie", "simplepie", "images") as $dir) {
$cache_dir = CACHE_DIR . "/$dir";
if ($debug) _debug("Expiring $cache_dir");
$num_deleted = 0;
if (is_writable($cache_dir)) {
$files = glob("$cache_dir/*");
foreach ($files as $file) {
if (time() - filemtime($file) > 86400*7) {
unlink($file);
++$num_deleted;
}
}
}
if ($debug) _debug("Removed $num_deleted files.");
}
}
?>