better image caching

.gitignore

@@ -26,6 +26,7 @@ addon/
 widget/
 custom/
 /store/
+cache/
 # site apps
 apps/
 !doc/context/*/apps

Zotlabs/Daemon/Cron_weekly.php

@@ -51,6 +51,23 @@ class Cron_weekly {
 		// Check for dead sites
 		Master::Summon(array('Checksites'));
 
+
+		// clean up image cache - use site expiration or 180 days if not set
+		
+		$files = glob('cache/img/*/*');
+		$expire_days = intval(get_config('system','default_expire_days', 180);
+		$now = time();
+
+		if ($files) {
+			foreach ($files as $file) {
+				if (is_file($file)) {
+					if ($now - filemtime($file) >= 60 * 60 * 24 * $expire_days) {
+						unlink($file);
+					}
+				}
+			}
+		}
+
 		// update searchable doc indexes
 		// disabled until help system regenerated
 		// Master::Summon(array('Importdoc'));

Zotlabs/Module/Ca.php

@@ -0,0 +1,30 @@
+<?php
+namespace Zotlabs\Module;
+
+use Zotlabs\Web\Controller;
+
+class Ca extends Controller {
+
+	function get() {
+		if (argc() > 1) {
+			$path = 'cache/img/' . substr(argv(1),0,2) . '/' . argv(1);
+
+			if (file_exists($path)) {
+				$x = @getimagesize($path);
+				if ($x) {
+					header('Content-Type: ' . $x['mime']);
+				}
+				$infile = fopen($path,'rb');
+				$outfile = fopen('php://output','wb');
+				pipe_streams($infile,$outfile);
+				fclose($infile);
+				fclose($outfile);
+				killme();
+			}
+			if ($_GET['url']) {
+				goaway($url);
+			}
+		}
+		http_status_exit(404,'Not found');
+	}
+}

include/text.php

@@ -993,18 +993,38 @@ function linkify($s, $me = false) {
 }
 
 /**
- * @brief Replace media element using http url with https to a local redirector
- *  if using https locally.
+ * @brief implement image caching
  *
- * Looks for HTML tags containing src elements that are http when we're viewing an https page
- * Typically this throws an insecure content violation in the browser. So we redirect them
- * to a local redirector which uses https and which redirects to the selected content
+ * Note: This is named sslify because the old behaviour was only to proxy image fetches to
+ * non-SSL resources. Now all images are cached.
  *
  * @param string $s
  * @returns string
  */
 function sslify($s) {
 
+	if (! intval(get_config('system','cache_images', 1))) {
+
+		if (strpos(z_root(),'https:') === false) {
+			return $s;
+		}
+
+		// we'll only sslify img tags because media files will probably choke.
+
+		$pattern = "/\<img(.*?)src=\"(http\:.*?)\"(.*?)\>/";
+
+		$matches = null;
+		$cnt = preg_match_all($pattern,$s,$matches,PREG_SET_ORDER);
+		if ($cnt) {
+			foreach ($matches as $match) {
+				$filename = basename( parse_url($match[2], PHP_URL_PATH) );
+				$s = str_replace($match[2],z_root() . '/sslify/' . $filename . '?f=&url=' . urlencode($match[2]),$s);
+			}
+		}
+
+		return $s;
+	}
+
 	$pattern = "/\<img(.*?)src=\"(https?\:.*?)\"(.*?)\>/ism";
 
 	$matches = null;
@@ -1016,7 +1036,7 @@ function sslify($s) {
 			}
 			$cached = Img_cache::check($match[2],'cache/img');
 			if ($cached) {
-				$s = str_replace($match[2],z_root() . '/' . Img_cache::get_filename($match[2],'cache/img') . '?url=' . urlencode($match[2]),$s);
+				$s = str_replace($match[2],z_root() . '/ca/' . basename(Img_cache::get_filename($match[2],'cache/img')) . '?url=' . urlencode($match[2]),$s);
 			}
 		}
 	}

install/INSTALL.txt

@@ -105,9 +105,10 @@ web server platforms.
     - make sure folders *cache/smarty3* and *store* exist and are 
     writable by the webserver
 
+		mkdir -p "store"
         mkdir -p "cache/smarty3"
 		
-        chmod -R 777 store
+        chmod -R 777 store cache
 
         [This permission (777) is very dangerous and if you have sufficient
         privilege and knowledge you should make these directories writeable