From 388d4dfa88e843237ebe57e9a0376d0cd58c0f51 Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@madoka.volgo-balt.ru>
Date: Thu, 23 Mar 2017 15:19:25 +0300
Subject: [PATCH] enable caching of media in article enclosures

---
 include/functions2.php |  5 +++++
 include/rssfuncs.php   | 29 ++++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/include/functions2.php b/include/functions2.php
index 9d6eb9330..e00a0ba13 100644
--- a/include/functions2.php
+++ b/include/functions2.php
@@ -1816,6 +1816,11 @@
 
 		if (db_num_rows($result) > 0) {
 			while ($line = db_fetch_assoc($result)) {
+
+				if (file_exists(CACHE_DIR . '/images/' . sha1($line["content_url"]))) {
+					$line["content_url"] = get_self_url_prefix() . '/public.php?op=cached_url&hash=' . sha1($line["content_url"]);
+				}
+
 				array_push($rv, $line);
 			}
 		}
diff --git a/include/rssfuncs.php b/include/rssfuncs.php
index 997ea4594..c03e6681e 100644
--- a/include/rssfuncs.php
+++ b/include/rssfuncs.php
@@ -1083,6 +1083,9 @@
 					}
 				}
 
+				if ($cache_images && is_writable(CACHE_DIR . '/images'))
+					cache_enclosures($enclosures, $site_url, $debug_enabled);
+
 				if ($debug_enabled) {
 					_debug("article enclosures:", $debug_enabled);
 					print_r($enclosures);
@@ -1227,6 +1230,30 @@
 		return $rss;
 	}
 
+	function cache_enclosures($enclosures, $site_url, $debug) {
+		foreach ($enclosures as $enc) {
+
+			if (preg_match("/(image|audio|video)/", $enc[1])) {
+
+				$src = rewrite_relative_url($site_url, $enc[0]);
+
+				$local_filename = CACHE_DIR . "/images/" . sha1($src);
+
+				if ($debug) _debug("cache_enclosures: downloading: $src to $local_filename");
+
+				if (!file_exists($local_filename)) {
+					$file_content = fetch_file_contents($src);
+
+					if ($file_content && strlen($file_content) > _MIN_CACHE_FILE_SIZE) {
+						file_put_contents($local_filename, $file_content);
+					}
+				} else {
+					touch($local_filename);
+				}
+			}
+		}
+	}
+
 	function cache_media($html, $site_url, $debug) {
 		libxml_use_internal_errors(true);
 
@@ -1238,7 +1265,7 @@
 		$doc->loadHTML($charset_hack . $html);
 		$xpath = new DOMXPath($doc);
 
-		$entries = $xpath->query('(//img[@src])|(//video/source[@src])');
+		$entries = $xpath->query('(//img[@src])|(//video/source[@src])|(//audio/source[@src])');
 
 		foreach ($entries as $entry) {
 			if ($entry->hasAttribute('src') && strpos($entry->getAttribute('src'), "data:") !== 0) {