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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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0
cache/images/.empty vendored Normal file
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7
classes/feeds.php
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@ -184,9 +184,10 @@ class Feeds extends Protected_Handler {
catchupArticlesById($this->link, $ids, $cmode);
} */
//if ($method == "ForceUpdate" && $feed && is_numeric($feed) > 0) {
// update_rss_feed($this->link, $feed, true);
//}
if ($method == "ForceUpdate" && $feed && is_numeric($feed) > 0) {
include "rssfuncs.php";
update_rss_feed($this->link, $feed, true);
}
if ($method == "MarkAllRead") {
catchup_feed($this->link, $feed, $cat_view);

11
classes/pref_feeds.php
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@ -448,12 +448,10 @@ class Pref_Feeds extends Protected_Handler {
$checked = "";
}
if (SIMPLEPIE_CACHE_IMAGES) {
print "<hr/><input dojoType=\"dijit.form.CheckBox\" type=\"checkbox\" id=\"cache_images\"
name=\"cache_images\"
$checked>&nbsp;<label for=\"cache_images\">".
__('Cache images locally (SimplePie only)')."</label>";
}
__('Cache images locally')."</label>";
$mark_unread_on_update = sql_bool_to_bool(db_fetch_result($result, 0, "mark_unread_on_update"));
@ -655,16 +653,13 @@ class Pref_Feeds extends Protected_Handler {
print "&nbsp;"; $this->batch_edit_cbox("always_display_enclosures", "always_display_enclosures_l");
if (SIMPLEPIE_CACHE_IMAGES) {
print "<br/><input disabled=\"1\" type=\"checkbox\" id=\"cache_images\"
name=\"cache_images\"
dojoType=\"dijit.form.CheckBox\">&nbsp;<label class='insensitive' id=\"cache_images_l\"
for=\"cache_images\">".
__('Cache images locally')."</label>";
print "&nbsp;"; $this->batch_edit_cbox("cache_images", "cache_images_l");
}
print "<br/><input disabled=\"1\" type=\"checkbox\" id=\"mark_unread_on_update\"
name=\"mark_unread_on_update\"
@ -741,11 +736,7 @@ class Pref_Feeds extends Protected_Handler {
$category_qpart_nocomma = "";
}
if (SIMPLEPIE_CACHE_IMAGES) {
$cache_images_qpart = "cache_images = $cache_images,";
} else {
$cache_images_qpart = "";
}
if (!$batch) {

6
config.php-dist
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@ -55,12 +55,6 @@
// *** Feed settings ***
// *********************
define('SIMPLEPIE_CACHE_IMAGES', false);
// Allow caching feed images when using SimplePie, to bypass hotlink
// prevention and such at expense of local disk space and bandwidth.
// Note that you (or your users) also have to enable image caching
// in feed editor.
define('DEFAULT_UPDATE_METHOD', 0);
// Which feed parsing library to use as default:
// 0 - Magpie

10
image.php
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@ -3,7 +3,13 @@
dirname(__FILE__) . "/include");
require_once "config.php";
require_once "lib/simplepie/simplepie.inc";
SimplePie_Misc::display_cached_file($_GET['i'], SIMPLEPIE_CACHE_DIR, 'spi');
$filename = CACHE_DIR . '/images/' . sha1($_GET['url']) . '.png';
if (file_exists($filename)) {
header("Content-type: image/png");
echo file_get_contents($filename);
} else {
header("Location: " . $_GET['url']);
}
?>

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.");
}
}
?>

19
mobile/image.php
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@ -1,6 +1,19 @@
<?php
require_once "../config.php";
require_once "../lib/simplepie/simplepie.inc";
set_include_path(get_include_path() . PATH_SEPARATOR .
dirname(__FILE__) . PATH_SEPARATOR .
dirname(dirname(__FILE__)) . PATH_SEPARATOR .
dirname(dirname(__FILE__)) . "/include" );
SimplePie_Misc::display_cached_file($_GET['i'], '../'.SIMPLEPIE_CACHE_DIR, 'spi');
require_once "config.php";
chdir('..');
$filename = CACHE_DIR . '/images/' . sha1($_GET['url']) . '.png';
if (file_exists($filename)) {
header("Content-type: image/png");
echo file_get_contents($filename);
} else {
header("Location: " . $_GET['url']);
}
?>