agriget/plugins/cache_starred_images/init.php

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PHP
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2019-03-22 22:17:29 +08:00
<?php
class Cache_Starred_Images extends Plugin implements IHandler {
/* @var PluginHost $host */
private $host;
private $cache_dir;
private $max_cache_attempts = 5; // per-article
function about() {
return array(1.0,
"Automatically cache Starred articles' images and HTML5 video files",
"fox",
true);
}
/**
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
function csrf_ignore($method) {
return false;
}
/**
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
function before($method) {
return true;
}
function after() {
return true;
}
function init($host) {
$this->host = $host;
$this->cache_dir = CACHE_DIR . "/starred-images/";
if (!is_dir($this->cache_dir)) {
mkdir($this->cache_dir);
}
if (is_dir($this->cache_dir)) {
if (!is_writable($this->cache_dir))
chmod($this->cache_dir, 0777);
if (is_writable($this->cache_dir)) {
$host->add_hook($host::HOOK_UPDATE_TASK, $this);
$host->add_hook($host::HOOK_HOUSE_KEEPING, $this);
$host->add_hook($host::HOOK_SANITIZE, $this);
$host->add_handler("public", "cache_starred_images_getimage", $this);
} else {
user_error("Starred cache directory is not writable.", E_USER_WARNING);
}
} else {
user_error("Unable to create starred cache directory.", E_USER_WARNING);
}
}
function cache_starred_images_getimage() {
ob_end_clean();
$hash = basename($_REQUEST["hash"]);
if ($hash) {
$filename = $this->cache_dir . "/" . basename($hash);
if (file_exists($filename)) {
header("Content-Disposition: attachment; filename=\"$hash\"");
send_local_file($filename);
} else {
header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
echo "File not found.";
}
}
}
/**
* @SuppressWarnings(PHPMD.UnusedLocalVariable)
*/
function hook_house_keeping() {
$files = glob($this->cache_dir . "/*.{png,mp4,status}", GLOB_BRACE);
$last_article_id = 0;
$article_exists = 1;
foreach ($files as $file) {
list ($article_id, $hash) = explode("-", basename($file));
if ($article_id != $last_article_id) {
$last_article_id = $article_id;
$sth = $this->pdo->prepare("SELECT id FROM ttrss_entries WHERE id = ?");
$sth->execute([$article_id]);
$article_exists = $sth->fetch();
}
if (!$article_exists) {
unlink($file);
}
}
}
/**
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
function hook_sanitize($doc, $site_url, $allowed_elements, $disallowed_attributes, $article_id) {
$xpath = new DOMXpath($doc);
if ($article_id) {
$entries = $xpath->query('(//img[@src])|(//video/source[@src])');
foreach ($entries as $entry) {
if ($entry->hasAttribute('src')) {
$src = rewrite_relative_url($site_url, $entry->getAttribute('src'));
$extension = $entry->tagName == 'source' ? '.mp4' : '.png';
$local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . $extension;
if (file_exists($local_filename)) {
$entry->setAttribute("src", get_self_url_prefix() .
"/public.php?op=cache_starred_images_getimage&method=image&hash=" .
$article_id . "-" . sha1($src) . $extension);
}
}
}
}
return $doc;
}
function hook_update_task() {
$res = $this->pdo->query("SELECT content, ttrss_user_entries.owner_uid, link, site_url, ttrss_entries.id, plugin_data
FROM ttrss_entries, ttrss_user_entries LEFT JOIN ttrss_feeds ON
(ttrss_user_entries.feed_id = ttrss_feeds.id)
WHERE ref_id = ttrss_entries.id AND
marked = true AND
(UPPER(content) LIKE '%<IMG%' OR UPPER(content) LIKE '%<VIDEO%') AND
site_url != '' AND
plugin_data NOT LIKE '%starred_cache_images%'
ORDER BY ".sql_random_function()." LIMIT 100");
$usth = $this->pdo->prepare("UPDATE ttrss_entries SET plugin_data = ? WHERE id = ?");
while ($line = $res->fetch()) {
if ($line["site_url"]) {
$success = $this->cache_article_images($line["content"], $line["site_url"], $line["owner_uid"], $line["id"]);
if ($success) {
$plugin_data = "starred_cache_images,${line['owner_uid']}:" . $line["plugin_data"];
$usth->execute([$plugin_data, $line['id']]);
}
}
}
}
/**
* @SuppressWarnings(PHPMD.UnusedFormalParameter)
*/
function cache_article_images($content, $site_url, $owner_uid, $article_id) {
libxml_use_internal_errors(true);
$status_filename = $this->cache_dir . $article_id . "-" . sha1($site_url) . ".status";
Debug::log("status: $status_filename", Debug::$LOG_EXTENDED);
if (file_exists($status_filename))
$status = json_decode(file_get_contents($status_filename), true);
else
$status = [];
$status["attempt"] += 1;
// only allow several download attempts for article
if ($status["attempt"] > $this->max_cache_attempts) {
Debug::log("too many attempts for $site_url", Debug::$LOG_VERBOSE);
return;
}
if (!file_put_contents($status_filename, json_encode($status))) {
user_error("unable to write status file: $status_filename", E_USER_WARNING);
return;
}
$doc = new DOMDocument();
$doc->loadHTML('<?xml encoding="UTF-8">' . $content);
$xpath = new DOMXPath($doc);
$entries = $xpath->query('(//img[@src])|(//video/source[@src])');
$success = false;
$has_images = false;
foreach ($entries as $entry) {
if ($entry->hasAttribute('src') && strpos($entry->getAttribute('src'), "data:") !== 0) {
$has_images = true;
$src = rewrite_relative_url($site_url, $entry->getAttribute('src'));
$extension = $entry->tagName == 'source' ? '.mp4' : '.png';
$local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . $extension;
Debug::log("cache_images: downloading: $src to $local_filename", Debug::$LOG_VERBOSE);
if (!file_exists($local_filename)) {
$file_content = fetch_file_contents(["url" => $src, "max_size" => MAX_CACHE_FILE_SIZE]);
if ($file_content) {
if (strlen($file_content) > MIN_CACHE_FILE_SIZE) {
file_put_contents($local_filename, $file_content);
}
$success = true;
}
} else {
$success = true;
}
}
}
return $success || !$has_images;
}
function api_version() {
return 2;
}
}