148 lines
4.8 KiB
PHP
148 lines
4.8 KiB
PHP
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<?php
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// Does not use cookies for sessions since the only session exists between
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// two requests where the URL of the second request is defined below.
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ini_set('session.use_cookies', '0');
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$compress = strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false;
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function mhtml($name, $data)
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{
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return "Content-Type: multipart/related; boundary=\"----\"\n".
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"\n".
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"------\n".
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"Content-Location:$name\n".
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"Content-Transfer-Encoding:base64\n".
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"\n".
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$data.
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"=\n".
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"------\n";
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}
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// Uses wire-compression for response
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if ($compress)
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{
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ob_start();
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ob_start("ob_gzhandler");
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}
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// Converts an uploaded file to a base64 MHTML response
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// which is inserted via injected JavaScript on the client-side.
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if ($_SERVER["REQUEST_METHOD"] == "POST")
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{
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$tmpfile = $_FILES["upfile"]["tmp_name"];
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header("Content-Type: text/html");
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echo "<html>\n";
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echo "<head>\n";
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echo "</head>\n";
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echo "<body>\n";
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echo "<script type=\"text/javascript\">\n";
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// Shows an error message on the client-side if the file is larger than
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// 32 KB, which is the maximum size foe data URIs in IE8.
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if (filesize($tmpfile) > 32768)
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{
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echo "alert(\"File exceeds the maximum allowed size. File must be less than 32KB.\");\n";
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}
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else
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{
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$img = file_get_contents($tmpfile);
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$data = base64_encode($img);
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// Makes the name unique by adding a timestamp as a postfix
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$name = $_FILES["upfile"]["name"]."-".mktime();
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// Stores the file in the session which only exists between this and the
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// next request. The subsequent request is handled in the else branch.
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// Note that the request destroys the session and its contents, however,
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// in IE the MHTML resource is only loaded once and kept in the browser.
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if ($_POST["dataurl"] == "false")
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{
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// In theory, up to 4K in 300 cookies can be used to transfer the data
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// directly in the GET request of the image to avoid a session state.
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// This can be done by splitting the base64 data into 4K cookies in the
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// insert method in the client and then forcing an image prefetch with
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// the respective MHTML URL for the image. On the server-side all we
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// we need to do is fetch the content location (get param) and data.
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// In practice most servers have a header size limit of 8-16K.
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session_start();
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$url = "'mhtml:'+window.location.href+'?PHPSESSID=".session_id()."&img=$name!$name'";
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$_SESSION["image"] = "<!--\n".mhtml($name, $data)."-->\n";
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}
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else
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{
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$url = "null";
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}
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echo "window.parent.insert(\"$name\", \"data:image/png,".$data."\", $url);\n";
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}
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// NOTE: Ignore "Failed to load resource" error in Chrome,
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// see http://code.google.com/p/chromium/issues/detail?id=29180
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echo "var iframe = window.parent.document.getElementById('embedimageframe');\n";
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echo "iframe.parentNode.removeChild(iframe);";
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echo "</script>\n";
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echo "</body>\n";
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echo "</html>\n";
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}
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// Fetches the given image and encodes it as a MHTM page.
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// On the client-side the page is used as is and the
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// base64 encoded data is extracted and put into an
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// mxImageBundle for storage with the diagram.
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else if (isset($_GET["url"]))
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{
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$url = $_GET["url"];
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$img = file_get_contents($url);
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// Enables caching of this response
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header("Content-Type: text/plain");
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header("Cache-Control: private");
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header("Expires: Thu, 15 Apr 2030 20:00:00 GMT");
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echo "<!--\n".mhtml("image", base64_encode($img))."-->\n";
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}
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// Returns the MHTML stored in the session.
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else if (isset($_GET["PHPSESSID"]))
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{
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header("Content-Type: text/plain");
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// Gets the image from the session and destroys the session (since we do
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// not use session cookies there is no need to delete a cookie here).
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session_start();
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echo $_SESSION["image"];
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session_destroy();
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}
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else
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{
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header("Content-Type: text/html");
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$userAgent = strtoupper(getenv("HTTP_USER_AGENT"));
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$dataUrl = strpos($userAgent, "MSIE 6") === false &&
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strpos($userAgent, "MSIE 7") === false;
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// In a real-world environment the following would be done for each entry
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// of the image bundle in an XML file for a diagram.
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$name = "myImage";
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$data = "R0lGODlhEAAQAMIGAAAAAICAAICAgP//AOzp2O3r2////////yH+FUNyZWF0ZWQgd2l0aCBUaGUgR0lNUAAh+QQBCgAHACwAAAAAEAAQAAADTXi63AowynnAMDfjPUDlnAAJhmeBFxAEloliKltWmiYCQvfVr6lBPB1ggxN1hilaSSASFQpIV5HJBDyHpqK2ejVRm2AAgZCdmCGO9CIBADs";
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$mhtml = ($dataUrl) ? "" : "\n".mhtml($name, $data);
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$bundle = "bundle.putImage('myImage', 'data:image/png,$data=', 'mhtml:' + window.location.href + '!$name');";
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// Replaces the placeholders in the template with the data from above.
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// Note: In a production environment you should use a template engine.
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$page = file_get_contents("embedimage.html");
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$page = str_replace("%mhtml%", $mhtml, $page);
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$page = str_replace("%dataUrl%", ($dataUrl) ? "true" : "false", $page);
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$page = str_replace("%bundle%", $bundle, $page);
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echo $page;
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}
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// Flushes the compression buffers
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if ($compress)
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{
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ob_end_flush();
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ob_end_flush();
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}
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?>
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