Add missing proxy.php

app/courses/proxy.php

@@ -0,0 +1,145 @@
+<?php
+/* For licensing terms, see /license.txt */
+
+/**
+ * Script needed in order to avoid mixed content in links inside a learning path
+ * In order to use this file you have to:
+ *
+ * 1. Modify configuration.php and add this setting: $_configuration['lp_fix_embed_content'] = true;
+ * 2. Copy this file in app/courses/proxy.php
+ * 3. Change your .htaccess in order to let the proxy.php to be read inside app/courses
+ *
+ */
+
+require_once '../config/configuration.php';
+
+/**
+ * Returns "%" or "px"
+ *
+ * 800px => function returns "px"
+ * 800% => function returns %
+ *
+ * @param string $value
+ * @return string
+ */
+function addPixelOrPercentage($value)
+{
+    $addPixel = strpos($value, 'px');
+    $addPixel = !($addPixel === false);
+    $addCharacter = '';
+    if ($addPixel == false) {
+        $addPercentage = strpos($value, '%');
+        $addPercentage = !($addPercentage === false);
+        if ($addPercentage) {
+            $addCharacter = '%';
+        }
+    } else {
+        $addCharacter = 'px';
+    }
+
+    return $addCharacter;
+}
+
+function get_http_response_code($theURL)
+{
+    $headers = get_headers($theURL);
+
+    return substr($headers[0], 9, 3);
+}
+
+
+$height = isset($_GET['height']) ? (int) $_GET['height'].addPixelOrPercentage($_GET['height']) : '';
+$width = isset($_GET['width']) ? (int) $_GET['width'].addPixelOrPercentage($_GET['width'])  : '';
+$vars = isset($_GET['flashvars']) ? htmlentities($_GET['flashvars']) : '';
+$src = isset($_GET['src']) ? htmlentities($_GET['src']) : '';
+$id = isset($_GET['id']) ? htmlentities($_GET['id']) : '';
+$type = isset($_GET['type']) ? $_GET['type'] : 'flash';
+
+// Fixes URL like: https://www.vopspsy.ugent.be/pdfs/download.php?own=mvsteenk&file=caleidoscoop.pdf
+if (strpos($src, 'download.php') !== false) {
+    $src = str_replace('download.php', 'download.php?', $src);
+    $src .= isset($_GET['own']) ? '&own='.htmlentities($_GET['own']) : '';
+    $src .= isset($_GET['file']) ? '&file='.htmlentities($_GET['file']) : '';
+}
+
+$result = get_http_response_code($src);
+$urlToTest = parse_url($src, PHP_URL_HOST);
+$g = stream_context_create (array('ssl' => array('capture_peer_cert' => true)));
+$r = @stream_socket_client("ssl://$urlToTest:443", $errno, $errstr, 30, STREAM_CLIENT_CONNECT, $g);
+$cont = stream_context_get_params($r);
+$convertToSecure = false;
+
+$certinfo = openssl_x509_parse($cont['options']['ssl']['peer_certificate']);
+if (isset($certinfo) && isset($certinfo['subject']) && isset($certinfo['subject']['CN'])) {
+    $certUrl = $certinfo['subject']['CN'];
+    $parsed = parse_url($certUrl);
+
+    // Remove www from URL
+    $parsedUrl = preg_replace('#^(http(s)?://)?w{3}\.#', '$1', $certUrl);
+
+    if ($urlToTest == $certUrl || $parsedUrl == $urlToTest) {
+        $convertToSecure = true;
+    }
+
+    if ($urlToTest != $certUrl) {
+        // url and cert url are different this will show a warning in browsers
+        // use normal "http" version
+        $result = false;
+    }
+}
+
+if ($result == false) {
+    $src = str_replace('https', 'http', $src);
+}
+
+if ($convertToSecure) {
+    $src = str_replace('http', 'https', $src);
+}
+
+$result = '';
+switch ($type) {
+    case 'link':
+        // Check if links comes from a course
+        $srcParts = explode('/', $src);
+        $srcParts = array_filter($srcParts);
+        $srcParts = array_values($srcParts);
+
+        if (isset($srcParts[0], $srcParts[2]) && $srcParts[0] === 'courses' && $srcParts[2] === 'document') {
+            $src = $_configuration['root_web'].$src;
+        }
+
+        if (strpos($src, 'http') === false) {
+            $src = "http://$src";
+        }
+        header('Location: '.$src);
+        exit;
+        break;
+    case 'iframe':
+        $result = '<iframe src="'.$src.'" width="'.$width.'" height="'.$height.'" ></iframe>';
+        break;
+    case 'flash':
+        $result =  '
+        <object 
+            id="'.$id.'" width="'.$width.'" height="'.$height.'" align="center"
+            codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0">
+            <param name="id" value="'.$id.'">
+            <param name="width" value="'.$width.'">
+            <param name="height" value="'.$height.'">
+            <param name="bgcolor" value="#ffffff">
+            <param name="align" value="center">
+            <param name="allowfullscreen" value="true">
+            <param name="allowscriptaccess" value="always">
+            <param name="quality" value="high">
+            <param name="wmode" value="transparent">
+            <param name="flashvars" value="'.$vars.'">
+            <param name="src" value="'.$src.'">
+            <embed 
+                id="'.$id.'" width="'.$width.'" height="'.$height.'" bgcolor="#ffffff" align="center" 
+                allowfullscreen="true" allowscriptaccess="always" quality="high" wmode="transparent" 
+                flashvars="'.$vars.'" src="'.$src.'"
+                type="application/x-shockwave-flash" 
+            >
+        </object>';
+}
+
+echo $result;