From 0d415fb3c9db41ee97b7ce933ebc84eab38a1fa4 Mon Sep 17 00:00:00 2001
From: zotlabs <mike@macgirvin.com>
Date: Sun, 7 Jan 2018 02:34:37 -0800
Subject: hubzilla issue #946

---
 Zotlabs/Lib/Img_filesize.php | 121 +++++++++++++++++++++++++++++++++++++++++++
 include/feedutils.php        |   9 +++-
 2 files changed, 128 insertions(+), 2 deletions(-)
 create mode 100644 Zotlabs/Lib/Img_filesize.php

diff --git a/Zotlabs/Lib/Img_filesize.php b/Zotlabs/Lib/Img_filesize.php
new file mode 100644
index 000000000..e7bef37e1
--- /dev/null
+++ b/Zotlabs/Lib/Img_filesize.php
@@ -0,0 +1,121 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+class Img_filesize {
+
+	private $url;
+
+	function __construct($url) {
+		$this->url = $url;
+	}
+
+	function getSize() {
+		$size = null;
+
+		if(stripos($this->url,z_root() . '/photo') !== false) {
+			$size = self::getLocalFileSize($this->url);
+		}
+		if(! $size) {
+			$size = getRemoteFileSize($this->url);
+		}
+
+		return $size;
+	}
+
+
+	static function getLocalFileSize($url) {
+	
+		$fname = basename($url);
+		$resolution = 0;
+	
+		if(strpos($fname,'.') !== false)
+			$fname = substr($fname,0,strpos($fname,'.'));
+	
+		if(substr($fname,-2,1) == '-') {
+			$resolution = intval(substr($fname,-1,1));
+			$fname = substr($fname,0,-2);
+		}
+			
+		$r = q("SELECT filesize FROM photo WHERE resource_id = '%s' AND imgscale = %d LIMIT 1",
+			dbesc($fname),
+			intval($resolution)
+		);
+		if($r) {
+			return $r[0]['filesize'];
+		}
+		return null;
+	}
+
+}
+
+/**
+ * Try to determine the size of a remote file by making an HTTP request for
+ * a byte range, or look for the content-length header in the response.
+ * The function aborts the transfer as soon as the size is found, or if no
+ * length headers are returned, it aborts the transfer.
+ *
+ * @return int|null null if size could not be determined, or length of content
+ */
+function getRemoteFileSize($url)
+{
+    $ch = curl_init($url);
+
+    $headers = array(
+        'Range: bytes=0-1',
+        'Connection: close',
+    );
+
+    $in_headers = true;
+    $size       = null;
+
+    curl_setopt($ch, CURLOPT_HEADER, 1);
+    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2450.0 Iron/46.0.2450.0');
+    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
+    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
+    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
+    curl_setopt($ch, CURLOPT_VERBOSE, 0); // set to 1 to debug
+    curl_setopt($ch, CURLOPT_STDERR, fopen('php://output', 'r'));
+
+    curl_setopt($ch, CURLOPT_HEADERFUNCTION, function($curl, $line) use (&$in_headers, &$size) {
+        $length = strlen($line);
+
+        if (trim($line) == '') {
+            $in_headers = false;
+        }
+
+        list($header, $content) = explode(':', $line, 2);
+        $header = strtolower(trim($header));
+
+        if ($header == 'content-range') {
+            // found a content-range header
+            list($rng, $s) = explode('/', $content, 2);
+            $size = (int)$s;
+            return 0; // aborts transfer
+        } else if ($header == 'content-length' && 206 != curl_getinfo($curl, CURLINFO_HTTP_CODE)) {
+            // found content-length header and this is not a 206 Partial Content response (range response)
+            $size = (int)$content;
+            return 0;
+        } else {
+            // continue
+            return $length;
+        }
+    });
+
+    curl_setopt($ch, CURLOPT_WRITEFUNCTION, function($curl, $data) use ($in_headers) {
+        if (!$in_headers) {
+            // shouldn't be here unless we couldn't determine file size
+            // abort transfer
+            return 0;
+        }
+
+        // write function is also called when reading headers
+        return strlen($data);
+    });
+
+    $result = curl_exec($ch);
+    $info   = curl_getinfo($ch);
+
+    return $size;
+}
\ No newline at end of file
diff --git a/include/feedutils.php b/include/feedutils.php
index 4638ef66a..5e48cb1ee 100644
--- a/include/feedutils.php
+++ b/include/feedutils.php
@@ -1801,12 +1801,17 @@ function compat_photos_list($s) {
 
 	if($found) {
 		foreach($matches as $match) {
-			$ret[] = [
+			$entry = [
 				'href' => $match[2],
-				'length' => 0,
 				'type' => guess_image_type($match[2])
 			];
+			$sizer = new \Zotlabs\Lib\Img_filesize($match[2]);
+			$size = $sizer->getSize();
+			if(intval($size)) {
+				$entry['length'] = intval($size);
+			}
 
+			$ret[] = $entry;
 		}
 	}
 
-- 
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