2 // Based upon "Privacy Image Cache" by Tobias Hößl <https://github.com/CatoTH/>
4 define("PROXY_DEFAULT_TIME", 86400); // 1 Day
6 define("PROXY_SIZE_MICRO", "micro");
7 define("PROXY_SIZE_THUMB", "thumb");
8 define("PROXY_SIZE_SMALL", "small");
9 define("PROXY_SIZE_MEDIUM", "medium");
10 define("PROXY_SIZE_LARGE", "large");
12 require_once('include/security.php');
13 require_once("include/Photo.php");
15 function proxy_init() {
18 // Pictures are stored in one of the following ways:
19 // 1. If a folder "proxy" exists and is writeable, then use this for caching
20 // 2. If a cache path is defined, use this
21 // 3. If everything else failed, cache into the database
23 // Question: Do we really need these three methods?
25 if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
26 header('HTTP/1.1 304 Not Modified');
27 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
28 header('Etag: '.$_SERVER['HTTP_IF_NONE_MATCH']);
29 header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
30 header("Cache-Control: max-age=31536000");
31 if(function_exists('header_remove')) {
32 header_remove('Last-Modified');
33 header_remove('Expires');
34 header_remove('Cache-Control');
39 if(function_exists('header_remove')) {
40 header_remove('Pragma');
41 header_remove('pragma');
48 // If the cache path isn't there, try to create it
49 if (!is_dir($_SERVER["DOCUMENT_ROOT"]."/proxy"))
50 if (is_writable($_SERVER["DOCUMENT_ROOT"]))
51 mkdir($_SERVER["DOCUMENT_ROOT"]."/proxy");
53 // Checking if caching into a folder in the webroot is activated and working
54 $direct_cache = (is_dir($_SERVER["DOCUMENT_ROOT"]."/proxy") AND is_writable($_SERVER["DOCUMENT_ROOT"]."/proxy"));
56 // Look for filename in the arguments
57 if ((isset($a->argv[1]) OR isset($a->argv[2]) OR isset($a->argv[3])) AND !isset($_REQUEST["url"])) {
58 if (isset($a->argv[3]))
60 elseif (isset($a->argv[2]))
65 if (isset($a->argv[3]) and ($a->argv[3] == "thumb"))
68 // thumb, small, medium and large.
69 if (substr($url, -6) == ":micro") {
72 $url = substr($url, 0, -6);
73 } elseif (substr($url, -6) == ":thumb") {
76 $url = substr($url, 0, -6);
77 } elseif (substr($url, -6) == ":small") {
79 $url = substr($url, 0, -6);
81 } elseif (substr($url, -7) == ":medium") {
83 $url = substr($url, 0, -7);
84 $sizetype = ":medium";
85 } elseif (substr($url, -6) == ":large") {
87 $url = substr($url, 0, -6);
91 $pos = strrpos($url, "=.");
93 $url = substr($url, 0, $pos+1);
95 $url = str_replace(array(".jpg", ".jpeg", ".gif", ".png"), array("","","",""), $url);
97 $url = base64_decode(strtr($url, '-_', '+/'), true);
100 $_REQUEST['url'] = $url;
102 $direct_cache = false;
104 if (!$direct_cache) {
105 $urlhash = 'pic:' . sha1($_REQUEST['url']);
107 $cachefile = get_cachefile(hash("md5", $_REQUEST['url']));
108 if ($cachefile != '') {
109 if (file_exists($cachefile)) {
110 $img_str = file_get_contents($cachefile);
111 $mime = image_type_to_mime_type(exif_imagetype($cachefile));
113 header("Content-type: $mime");
114 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
115 header('Etag: "'.md5($img_str).'"');
116 header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
117 header("Cache-Control: max-age=31536000");
119 // reduce quality - if it isn't a GIF
120 if ($mime != "image/gif") {
121 $img = new Photo($img_str, $mime);
122 if($img->is_valid()) {
123 $img_str = $img->imageString();
136 if (!$direct_cache AND ($cachefile == "")) {
137 $r = q("SELECT * FROM `photo` WHERE `resource-id` = '%s' LIMIT 1", $urlhash);
139 $img_str = $r[0]['data'];
140 $mime = $r[0]["desc"];
141 if ($mime == "") $mime = "image/jpeg";
147 // It shouldn't happen but it does - spaces in URL
148 $_REQUEST['url'] = str_replace(" ", "+", $_REQUEST['url']);
150 $img_str = fetch_url($_REQUEST['url'],true, $redirects, 10);
152 $tempfile = tempnam(get_temppath(), "cache");
153 file_put_contents($tempfile, $img_str);
154 $mime = image_type_to_mime_type(exif_imagetype($tempfile));
157 // If there is an error then return a blank image
158 if ((substr($a->get_curl_code(), 0, 1) == "4") or (!$img_str)) {
159 $img_str = file_get_contents("images/blank.png");
161 $cachefile = ""; // Clear the cachefile so that the dummy isn't stored
163 $img = new Photo($img_str, "image/png");
164 if($img->is_valid()) {
165 $img->scaleImage(10);
166 $img_str = $img->imageString();
168 } else if (($mime != "image/jpeg") AND !$direct_cache AND ($cachefile == "")) {
169 $image = @imagecreatefromstring($img_str);
171 if($image === FALSE) die();
173 q("INSERT INTO `photo`
174 ( `uid`, `contact-id`, `guid`, `resource-id`, `created`, `edited`, `filename`, `album`, `height`, `width`, `desc`, `data`, `scale`, `profile`, `allow_cid`, `allow_gid`, `deny_cid`, `deny_gid` )
175 VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', '%s', %d, %d, '%s', '%s', '%s', '%s' )",
176 0, 0, get_guid(), dbesc($urlhash),
177 dbesc(datetime_convert()),
178 dbesc(datetime_convert()),
179 dbesc(basename(dbesc($_REQUEST["url"]))),
181 intval(imagesy($image)),
182 intval(imagesx($image)),
187 dbesc(''), dbesc(''), dbesc(''), dbesc('')
191 $img = new Photo($img_str, $mime);
192 if($img->is_valid()) {
193 if (!$direct_cache AND ($cachefile == ""))
194 $img->store(0, 0, $urlhash, $_REQUEST['url'], '', 100);
199 $img_str_orig = $img_str;
201 // reduce quality - if it isn't a GIF
202 if ($mime != "image/gif") {
203 $img = new Photo($img_str, $mime);
204 if($img->is_valid()) {
205 $img->scaleImage($size);
206 $img_str = $img->imageString();
210 // If there is a real existing directory then put the cache file there
211 // advantage: real file access is really fast
212 // Otherwise write in cachefile
213 if ($valid AND $direct_cache) {
214 file_put_contents($_SERVER["DOCUMENT_ROOT"]."/proxy/".proxy_url($_REQUEST['url'], true), $img_str_orig);
216 file_put_contents($_SERVER["DOCUMENT_ROOT"]."/proxy/".proxy_url($_REQUEST['url'], true).$sizetype, $img_str);
217 } elseif ($cachefile != '')
218 file_put_contents($cachefile, $img_str_orig);
220 header("Content-type: $mime");
222 // Only output the cache headers when the file is valid
224 header("Last-Modified: " . gmdate("D, d M Y H:i:s", time()) . " GMT");
225 header('Etag: "'.md5($img_str).'"');
226 header("Expires: " . gmdate("D, d M Y H:i:s", time() + (31536000)) . " GMT");
227 header("Cache-Control: max-age=31536000");
235 function proxy_url($url, $writemode = false, $size = "") {
240 // Only continue if it isn't a local image and the isn't deactivated
241 if (proxy_is_local_image($url)) {
242 $url = str_replace(normalise_link($a->get_baseurl())."/", $a->get_baseurl()."/", $url);
246 if (get_config("system", "proxy_disabled"))
249 // Creating a sub directory to reduce the amount of files in the cache directory
250 $basepath = $_SERVER["DOCUMENT_ROOT"]."/proxy";
252 $path = substr(hash("md5", $url), 0, 2);
254 if (is_dir($basepath) and $writemode)
255 if (!is_dir($basepath."/".$path)) {
256 mkdir($basepath."/".$path);
257 chmod($basepath."/".$path, 0777);
260 $path .= "/".strtr(base64_encode($url), '+/', '-_');
262 // Checking for valid extensions. Only add them if they are safe
263 $pos = strrpos($url, ".");
265 $extension = strtolower(substr($url, $pos+1));
266 $pos = strpos($extension, "?");
268 $extension = substr($extension, 0, $pos);
271 $extensions = array("jpg", "jpeg", "gif", "png");
273 if (in_array($extension, $extensions))
274 $path .= ".".$extension;
276 $proxypath = $a->get_baseurl()."/proxy/".$path;
281 // Too long files aren't supported by Apache
282 // Writemode in combination with long files shouldn't be possible
283 if ((strlen($proxypath) > 250) AND $writemode)
284 return (hash("md5", $url));
285 elseif (strlen($proxypath) > 250)
286 return ($a->get_baseurl()."/proxy/".hash("md5", $url)."?url=".urlencode($url));
290 return ($proxypath.$size);
297 function proxy_is_local_image($url) {
298 if ($url[0] == '/') return true;
300 if (strtolower(substr($url, 0, 5)) == "data:") return true;
302 // links normalised - bug #431
303 $baseurl = normalise_link(get_app()->get_baseurl());
304 $url = normalise_link($url);
305 return (substr($url, 0, strlen($baseurl)) == $baseurl);
308 function proxy_parse_query($var) {
310 * Use this function to parse out the query array element from
311 * the output of parse_url().
313 $var = parse_url($var, PHP_URL_QUERY);
314 $var = html_entity_decode($var);
315 $var = explode('&', $var);
318 foreach($var as $val) {
319 $x = explode('=', $val);
323 unset($val, $x, $var);
327 function proxy_img_cb($matches) {
329 // if the picture seems to be from another picture cache then take the original source
330 $queryvar = proxy_parse_query($matches[2]);
331 if (($queryvar['url'] != "") AND (substr($queryvar['url'], 0, 4) == "http"))
332 $matches[2] = urldecode($queryvar['url']);
334 // following line changed per bug #431
335 if (proxy_is_local_image($matches[2]))
336 return $matches[1] . $matches[2] . $matches[3];
338 return $matches[1].proxy_url(htmlspecialchars_decode($matches[2])).$matches[3];
341 function proxy_parse_html($html) {
343 $html = str_replace(normalise_link($a->get_baseurl())."/", $a->get_baseurl()."/", $html);
345 return preg_replace_callback("/(<img [^>]*src *= *[\"'])([^\"']+)([\"'][^>]*>)/siU", "proxy_img_cb", $html);