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+<?php
+/**
+ * StatusNet, the distributed open-source microblogging tool
+ *
+ * Utilities for theme files and paths
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category Paths
+ * @package StatusNet
+ * @author Brion Vibber <brion@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link http://status.net/
+ */
+
+if (!defined('STATUSNET') && !defined('LACONICA')) {
+ exit(1);
+}
+
+/**
+ * Encapsulation of the validation-and-save process when dealing with
+ * a user-uploaded StatusNet theme archive...
+ *
+ * @todo extract theme metadata from css/display.css
+ * @todo allow saving multiple themes
+ */
+class ThemeUploader
+{
+ protected $sourceFile;
+ protected $isUpload;
+ private $prevErrorReporting;
+
+ public function __construct($filename)
+ {
+ if (!class_exists('ZipArchive')) {
+ throw new Exception(_("This server cannot handle theme uploads without ZIP support."));
+ }
+ $this->sourceFile = $filename;
+ }
+
+ public static function fromUpload($name)
+ {
+ if (!isset($_FILES[$name]['error'])) {
+ throw new ServerException(_("Theme upload missing or failed."));
+ }
+ if ($_FILES[$name]['error'] != UPLOAD_ERR_OK) {
+ throw new ServerException(_("Theme upload missing or failed."));
+ }
+ return new ThemeUploader($_FILES[$name]['tmp_name']);
+ }
+
+ /**
+ * @param string $destDir
+ * @throws Exception on bogus files
+ */
+ public function extract($destDir)
+ {
+ $zip = $this->openArchive();
+
+ // First pass: validate but don't save anything to disk.
+ // Any errors will trip an exception.
+ $this->traverseArchive($zip);
+
+ // Second pass: now that we know we're good, actually extract!
+ $tmpDir = $destDir . '.tmp' . getmypid();
+ $this->traverseArchive($zip, $tmpDir);
+
+ $zip->close();
+
+ if (file_exists($destDir)) {
+ $killDir = $tmpDir . '.old';
+ $this->quiet();
+ $ok = rename($destDir, $killDir);
+ $this->loud();
+ if (!$ok) {
+ common_log(LOG_ERR, "Could not move old custom theme from $destDir to $killDir");
+ throw new ServerException(_("Failed saving theme."));
+ }
+ } else {
+ $killDir = false;
+ }
+
+ $this->quiet();
+ $ok = rename($tmpDir, $destDir);
+ $this->loud();
+ if (!$ok) {
+ common_log(LOG_ERR, "Could not move saved theme from $tmpDir to $destDir");
+ throw new ServerException(_("Failed saving theme."));
+ }
+
+ if ($killDir) {
+ $this->recursiveRmdir($killDir);
+ }
+ }
+
+ /**
+ *
+ */
+ protected function traverseArchive($zip, $outdir=false)
+ {
+ $sizeLimit = 2 * 1024 * 1024; // 2 megabyte space limit?
+ $blockSize = 4096; // estimated; any entry probably takes this much space
+
+ $totalSize = 0;
+ $hasMain = false;
+ $commonBaseDir = false;
+
+ for ($i = 0; $i < $zip->numFiles; $i++) {
+ $data = $zip->statIndex($i);
+ $name = str_replace('\\', '/', $data['name']);
+
+ if (substr($name, -1) == '/') {
+ // A raw directory... skip!
+ continue;
+ }
+
+ // Check the directory structure...
+ $path = pathinfo($name);
+ $dirs = explode('/', $path['dirname']);
+ $baseDir = array_shift($dirs);
+ if ($commonBaseDir === false) {
+ $commonBaseDir = $baseDir;
+ } else {
+ if ($commonBaseDir != $baseDir) {
+ throw new ClientException(_("Invalid theme: bad directory structure."));
+ }
+ }
+
+ foreach ($dirs as $dir) {
+ $this->validateFileOrFolder($dir);
+ }
+
+ // Is this a safe or skippable file?
+ if ($this->skippable($path['filename'], $path['extension'])) {
+ // Documentation and such... booooring
+ continue;
+ } else {
+ $this->validateFile($path['filename'], $path['extension']);
+ }
+
+ $fullPath = $dirs;
+ $fullPath[] = $path['basename'];
+ $localFile = implode('/', $fullPath);
+ if ($localFile == 'css/display.css') {
+ $hasMain = true;
+ }
+
+ $size = $data['size'];
+ $estSize = $blockSize * max(1, intval(ceil($size / $blockSize)));
+ $totalSize += $estSize;
+ if ($totalSize > $sizeLimit) {
+ $msg = sprintf(_("Uploaded theme is too large; " .
+ "must be less than %d bytes uncompressed."),
+ $sizeLimit);
+ throw new ClientException($msg);
+ }
+
+ if ($outdir) {
+ $this->extractFile($zip, $data['name'], "$outdir/$localFile");
+ }
+ }
+
+ if (!$hasMain) {
+ throw new ClientException(_("Invalid theme archive: " .
+ "missing file css/display.css"));
+ }
+ }
+
+ protected function skippable($filename, $ext)
+ {
+ $skip = array('txt', 'rtf', 'doc', 'docx', 'odt');
+ if (strtolower($filename) == 'readme') {
+ return true;
+ }
+ if (in_array(strtolower($ext), $skip)) {
+ return true;
+ }
+ return false;
+ }
+
+ protected function validateFile($filename, $ext)
+ {
+ $this->validateFileOrFolder($filename);
+ $this->validateExtension($ext);
+ // @fixme validate content
+ }
+
+ protected function validateFileOrFolder($name)
+ {
+ if (!preg_match('/^[a-z0-9_-]+$/i', $name)) {
+ $msg = _("Theme contains invalid file or folder name. " .
+ "Stick with ASCII letters, digits, underscore, and minus sign.");
+ throw new ClientException($msg);
+ }
+ return true;
+ }
+
+ protected function validateExtension($ext)
+ {
+ $allowed = array('css', 'png', 'gif', 'jpg', 'jpeg');
+ if (!in_array(strtolower($ext), $allowed)) {
+ $msg = sprintf(_("Theme contains file of type '.%s', " .
+ "which is not allowed."),
+ $ext);
+ throw new ClientException($msg);
+ }
+ return true;
+ }
+
+ /**
+ * @return ZipArchive
+ */
+ protected function openArchive()
+ {
+ $zip = new ZipArchive;
+ $ok = $zip->open($this->sourceFile);
+ if ($ok !== true) {
+ common_log(LOG_ERR, "Error opening theme zip archive: " .
+ "{$this->sourceFile} code: {$ok}");
+ throw new Exception(_("Error opening theme archive."));
+ }
+ return $zip;
+ }
+
+ /**
+ * @param ZipArchive $zip
+ * @param string $from original path inside ZIP archive
+ * @param string $to final destination path in filesystem
+ */
+ protected function extractFile($zip, $from, $to)
+ {
+ $dir = dirname($to);
+ if (!file_exists($dir)) {
+ $this->quiet();
+ $ok = mkdir($dir, 0755, true);
+ $this->loud();
+ if (!$ok) {
+ common_log(LOG_ERR, "Failed to mkdir $dir while uploading theme");
+ throw new ServerException(_("Failed saving theme."));
+ }
+ } else if (!is_dir($dir)) {
+ common_log(LOG_ERR, "Output directory $dir not a directory while uploading theme");
+ throw new ServerException(_("Failed saving theme."));
+ }
+
+ // ZipArchive::extractTo would be easier, but won't let us alter
+ // the directory structure.
+ $in = $zip->getStream($from);
+ if (!$in) {
+ common_log(LOG_ERR, "Couldn't open archived file $from while uploading theme");
+ throw new ServerException(_("Failed saving theme."));
+ }
+ $this->quiet();
+ $out = fopen($to, "wb");
+ $this->loud();
+ if (!$out) {
+ common_log(LOG_ERR, "Couldn't open output file $to while uploading theme");
+ throw new ServerException(_("Failed saving theme."));
+ }
+ while (!feof($in)) {
+ $buffer = fread($in, 65536);
+ fwrite($out, $buffer);
+ }
+ fclose($in);
+ fclose($out);
+ }
+
+ private function quiet()
+ {
+ $this->prevErrorReporting = error_reporting();
+ error_reporting($this->prevErrorReporting & ~E_WARNING);
+ }
+
+ private function loud()
+ {
+ error_reporting($this->prevErrorReporting);
+ }
+
+ private function recursiveRmdir($dir)
+ {
+ $list = dir($dir);
+ while (($file = $list->read()) !== false) {
+ if ($file == '.' || $file == '..') {
+ continue;
+ }
+ $full = "$dir/$file";
+ if (is_dir($full)) {
+ $this->recursiveRmdir($full);
+ } else {
+ unlink($full);
+ }
+ }
+ $list->close();
+ rmdir($dir);
+ }
+
+}
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