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+<?php
+
+/**
+ * Move user's data directories from using username to registration date
+ */
+
+/**
+ * Generates a file matrix like Elgg 1.0 did
+ *
+ * @param string $username Username of user
+ *
+ * @return string File matrix path
+ */
+function file_matrix_1_0($username) {
+ $matrix = "";
+
+ $len = strlen($username);
+ if ($len > 5) {
+ $len = 5;
+ }
+
+ for ($n = 0; $n < $len; $n++) {
+ if (ctype_alnum($username[$n])) {
+ $matrix .= $username[$n] . "/";
+ }
+ }
+
+ return $matrix . $username . "/";
+}
+
+
+/**
+ * Generate a file matrix like Elgg 1.1, 1.2 and 1.5
+ *
+ * @param string $filename The filename
+ *
+ * @return string
+ */
+function file_matrix_1_1($filename) {
+ $matrix = "";
+
+ $name = $filename;
+ $filename = mb_str_split($filename);
+ if (!$filename) {
+ return false;
+ }
+
+ $len = count($filename);
+ if ($len > 5) {
+ $len = 5;
+ }
+
+ for ($n = 0; $n < $len; $n++) {
+ $matrix .= $filename[$n] . "/";
+ }
+
+ return $matrix . $name . "/";
+}
+
+/**
+ * Handle splitting multibyte strings
+ *
+ * @param string $string String to split.
+ * @param string $charset Charset to use.
+ *
+ * @return array|false
+ */
+function mb_str_split($string, $charset = 'UTF8') {
+ if (is_callable('mb_substr')) {
+ $length = mb_strlen($string);
+ $array = array();
+
+ while ($length) {
+ $array[] = mb_substr($string, 0, 1, $charset);
+ $string = mb_substr($string, 1, $length, $charset);
+
+ $length = mb_strlen($string);
+ }
+
+ return $array;
+ } else {
+ return str_split($string);
+ }
+
+ return false;
+}
+
+
+/**
+ * 1.6 style file matrix
+ *
+ * @param string $filename The filename
+ *
+ * @return string
+ */
+function file_matrix_1_6($filename) {
+ $invalid_fs_chars = '*\'\\/"!$%^&*.%(){}[]#~?<>;|¬`@-+=';
+
+ $matrix = "";
+
+ $name = $filename;
+ $filename = mb_str_split($filename);
+ if (!$filename) {
+ return false;
+ }
+
+ $len = count($filename);
+ if ($len > 5) {
+ $len = 5;
+ }
+
+ for ($n = 0; $n < $len; $n++) {
+
+ // Prevent a matrix being formed with unsafe characters
+ $char = $filename[$n];
+ if (strpos($invalid_fs_chars, $char) !== false) {
+ $char = '_';
+ }
+
+ $matrix .= $char . "/";
+ }
+
+ return $matrix . $name . "/";
+}
+
+
+/**
+ * Scans a directory and moves any files from $from to $to
+ * preserving structure and handling existing paths.
+ * Will no overwrite files in $to.
+ *
+ * TRAILING SLASHES REQUIRED.
+ *
+ * @param string $from From dir.
+ * @param string $to To dir.
+ * @param bool $move True to move, false to copy.
+ * @param string $preference to|from If file collisions, which dir has preference.
+ *
+ * @return bool
+ */
+function merge_directories($from, $to, $move = false, $preference = 'to') {
+ if (!$entries = scandir($from)) {
+ return false;
+ }
+
+ // character filtering needs to be elsewhere.
+ if (!is_dir($to)) {
+ mkdir($to, 0700, true);
+ }
+
+ if ($move === true) {
+ $f = 'rename';
+ } else {
+ $f = 'copy';
+ }
+
+ foreach ($entries as $entry) {
+ if ($entry == '.' || $entry == '..') {
+ continue;
+ }
+
+ $from_path = $from . $entry;
+ $to_path = $to . $entry;
+
+ // check to see if the path exists and is a dir, if so, recurse.
+ if (is_dir($from_path) && is_dir($to_path)) {
+ $from_path .= '/';
+ $to_path .= '/';
+ merge_directories($from_path, $to_path, $move, $preference);
+
+ // since it's a dir that already exists we don't need to move it
+ continue;
+ }
+
+ // only move if target doesn't exist or if preference is for the from dir
+ if (!file_exists($to_path) || $preference == 'from') {
+
+ if ($f($from_path, $to_path)) {
+ //elgg_dump("Moved/Copied $from_path to $to_path");
+ }
+ } else {
+ //elgg_dump("Ignoring $from_path -> $to_path");
+ }
+ }
+}
+
+/**
+ * Create a 1.7 style user file matrix based upon date.
+ *
+ * @param int $guid Guid of owner
+ *
+ * @return string File matrix path
+ */
+function user_file_matrix($guid) {
+ // lookup the entity
+ $user = get_entity($guid);
+ if ($user->type != 'user') {
+ // only to be used for user directories
+ return FALSE;
+ }
+
+ $time_created = date('Y/m/d', $user->time_created);
+ return "$time_created/$user->guid/";
+}
+
+global $DB_QUERY_CACHE, $DB_PROFILE, $ENTITY_CACHE;
+/**
+ * Upgrade file locations
+ */
+$users = mysql_query("SELECT guid, username
+ FROM {$CONFIG->dbprefix}users_entity WHERE username != ''");
+while ($user = mysql_fetch_object($users)) {
+ $DB_QUERY_CACHE = $DB_PROFILE = $ENTITY_CACHE = array();
+
+ $to = $CONFIG->dataroot . user_file_matrix($user->guid);
+ foreach (array('1_0', '1_1', '1_6') as $version) {
+ $function = "file_matrix_$version";
+ $from = $CONFIG->dataroot . $function($user->username);
+ merge_directories($from, $to, $move = TRUE, $preference = 'from');
+ }
+}