diff --git a/wall/lib/walls.inc b/wall/lib/walls.inc
index f367cf5c..d510b909 100755
--- a/wall/lib/walls.inc
+++ b/wall/lib/walls.inc
@@ -1,405 +1,404 @@
-<?php
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-require_once("parapara.inc");
-require_once("db.inc");
-require_once("exceptions.inc");
-require_once("UriUtils.inc");
-
-// When updating this, be sure to update wall.js as well
-define("WALLMAKER_SESSION_NAME", "WMSESSID");
-
-// Given a user id, returns an array of walls owned by that user with the 
-// following information:
-//
-//   wallId
-//   event name
-//   design thumb URL
-//   whether they will display in the gallery or not
-//   creation date (UTC)
-//   modification date (UTC)
-//
-// The results will be sorted by creation date such that recently created walls 
-// sort before older walls.
-
-function getWallSummaryForUser($email) {
-  // XXX Convert this to use exceptions
-  // Get connection
-  global $config;
-  $mdb2 =& MDB2::factory($config['db']['dsn']);
-  if (PEAR::isError($mdb2)) {
-    error_log('Error connecting to DB: ' . $mdb2->getMessage()
-               . ', ' . $mdb2->getDebugInfo());
-    return null;
-  }
-
-  // Run query
-  $res =& $mdb2->query(
-      'SELECT walls.wallId, walls.eventName, designs.thumbUrl,'
-    . ' walls.galleryDisplay, walls.createDate, walls.modifyDate, walls.designId'
-    . ' FROM users, walls'
-    . ' LEFT JOIN designs on designs.designId = walls.designId'
-    . ' WHERE users.email = '
-    . $mdb2->quote($email, 'text')
-    . '   AND walls.owner = users.userId'
-    . ' ORDER BY walls.createDate DESC');
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    return null;
-  }
-
-  // Process each array so we can tweak the values and make them a little less 
-  // bound to the db schema
-  $result = array();
-  $mdb2->setFetchMode(MDB2_FETCHMODE_ASSOC);
-  while ($row = $res->fetchRow()) {
-    $result[] =
-      array(
-        'wallId' => $row['wallid'],
-        'eventName' => $row['eventname'],
-        'thumb' => $row['thumburl'],
-        'designId' => intval($row['designid']),
-        'galleryDisplay' => !!($row['gallerydisplay']),
-        'createDate' => $row['createdate'],
-        'modifyDate' => $row['modifydate']
-      );
-  }
-
-  // Tidy up and finish
-  $mdb2->disconnect();
-
-  return $result;
-}
-
-function createWall($params) {
-  // Get connection
-  $conn =& getDbConnection();
-
-  // Validate owner email
-  $email = trim(@$params['ownerEmail']);
-  if (!strlen($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
-    error_log("Bad or missing email when creating wall");
-    throw new KeyedException('server-error', 'No email for user');
-  }
-
-  // Fetch user ID for owner
-  $ownerId = getOrCreateUserIdFromEmail($email);
-
-  // Validate title
-  $title = trim(@$params['title']);
-  if (!strlen($title)) {
-    error_log("Empty title");
-    throw new KeyedException('empty-title');
-  }
-  // XXX Test this
-  if (!isTitleUnique($title)) {
-    error_log("Even with title '$title' already exists.");
-    throw new KeyedException('duplicate-title');
-  }
-
-  // Validate ID
-  $designId = intval(@$params['design']);
-  if ($designId < 1) {
-    error_log("Bad design ID: $designId");
-    throw new KeyedException('design-not-found', 'Bad design ID');
-  }
-  if (!isDesignIdValid($designId)) {
-    error_log("Could't find design ID " . $designId);
-    throw new KeyedException('design-not-found', 'ID not found');
-  }
-
-  // Get URLs
-  $path      = getPathForTitle($title);
-  $wallUrl   = getWallUrlForPath($path);
-  $editorUrl = getWallUrlForPath($path);
-
-  $shortUrl = shortenUrl($wallUrl);
-  if ($shortUrl == $wallUrl)
-    $shortUrl = NULL;
-
-  $editorShortUrl = shortenUrl($editorUrl);
-  if ($editorShortUrl == $editorUrl)
-    $editorShortUrl = NULL;
-
-  $date = gmdate('Y-m-d H:i:s');
-
-  // Run query
-  $query =
-    'INSERT INTO walls'
-    . ' (owner, designId, eventName, galleryDisplay, urlPath, shortUrl,'
-    . '  editorShortUrl, createDate, modifyDate)'
-    . ' VALUES '
-    . '(' . $conn->quote($ownerId, 'integer')
-    . ',' . $conn->quote($designId, 'integer')
-    . ',' . $conn->quote($title, 'text')
-    . ',TRUE' // galleryDisplay
-    . ',' . $conn->quote($path, 'text')
-    . ',' . (($shortUrl) ? $conn->quote($shortUrl, 'text') : 'NULL')
-    . ',' . (($editorShortUrl) ? $conn->quote($editorShortUrl, 'text') : 'NULL')
-    . ',' . $conn->quote($date, 'timestamp')
-    . ',' . $conn->quote($date, 'timestamp')
-    . ')';
-  $res =& $conn->query($query);
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-
-  // Get ID of newly created wall
-  $wallId = $conn->lastInsertID('walls', 'wallId');
-  if (PEAR::isError($wallId)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-
-  return intval($wallId);
-}
-
-function getOrCreateUserIdFromEmail($email) {
-  $conn =& getDbConnection();
-  $res =& $conn->queryOne(
-      'SELECT userId FROM users WHERE email = '
-    . $conn->quote($email, 'text')
-    . ' LIMIT 1',
-    'integer');
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-
-  // If user does not exist, add a record for them
-  if ($res >= 1)
-    return $res;
-
-  $res =& $conn->query('INSERT INTO users (email) VALUES ('
-    . $conn->quote($email, 'text')
-    . ')');
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-
-  $ownerId = $conn->lastInsertID('users', 'userId');
-  if (PEAR::isError($ownerId)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-
-  return $ownerId;
-}
-
-function getWall($wallId) {
-  $conn =& getDbConnection();
-  $res =& $conn->query(
-      'SELECT walls.designId,eventName,eventDescr,eventLocation,eventType,eventFinish,urlPath,shortUrl,editorShortUrl,walls.duration,galleryDisplay,passcode,designs.duration AS defaultduration FROM walls,designs WHERE walls.designId = designs.designId AND wallId = '
-    . $conn->quote($wallId, 'integer')
-  );
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $result = array();
-  $conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
-  if ($row = $res->fetchRow()) {
-    $result["designId"] = $row['designid'];
-    $result["eventName"] = $row['eventname'];
-    $result["eventDescr"] = $row['eventdescr'];
-    $result["eventLocation"] = $row['eventlocation'];
-    $result["eventType"] = $row['eventtype'];
-    $result["eventFinish"] = $row['eventfinish'];
-    $result["urlPath"] = $row['urlpath'];
-    $result["shortUrl"] = $row['shorturl'];
-    $result["editorShortUrl"] = $row['editorshorturl'];
-    $result["galleryDisplay"] = $row['gallerydisplay'];
-    $result["duration"] = $row['duration'];
-    $result["defaultDuration"] = $row['defaultduration'];
-    $result["passcode"] = $row['passcode'] != NULL ? strlen($row['passcode']) : 0;
-  }
-  $conn->disconnect();
-  return $result;
-}
-
-function updateWall($wallId, $name, $value, $type) {
-  $conn =& getDbConnection();
-  $qvalue = $conn->quote($value, $type);
-  $qwallid = $conn->quote($wallId, 'integer');
-  $query = 'UPDATE walls SET '.$name.'='.$qvalue.' WHERE wallId = '.$qwallid;
-  $res =& $conn->query($query);
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $conn->disconnect();
-}
-
-// Returns NULL if the wall is not found
-function getWallIdFromPath($path) {
-  $conn =& getDbConnection();
-  $res =& $conn->queryOne(
-      'SELECT wallId FROM walls WHERE urlPath = '
-      . $conn->quote(rawurlencode($path), 'text')
-      . ' LIMIT 1',
-      'integer');
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  return $res;
-}
-
-function startNewSession($wallId, $datetime) {
-  $conn =& getDbConnection();
-  $qwallid = $conn->quote($wallId, 'integer');
-  $qdatetime = $conn->quote($datetime, 'timestamp');
-  $query = 'INSERT INTO sessions(wallId,beginDate) VALUES('.$wallId.','.$qdatetime.')';
-  $res =& $conn->query($query);
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $conn->disconnect();
-}
-
-function closeLastSession($wallId, $datetime) {
-  $conn =& getDbConnection();
-  $qwallid = $conn->quote($wallId, 'integer');
-  $qdatetime = $conn->quote($datetime, 'timestamp');
-  //makes temp table for (You can't specify target table 'sessions' for update in FROM clause)
-  $query = 'UPDATE sessions SET endDate='.$qdatetime.' WHERE endDate IS NULL AND wallId='.$wallId.' AND sessionId=(SELECT temp.sessionId FROM (SELECT MAX(sessionId) AS sessionID FROM sessions WHERE wallId='.$wallId.') AS temp)';
-  $res =& $conn->query($query);
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $conn->disconnect();
-}
-
-// Returns NULL if there is no active session for the wall
-function getActiveSession($wallId) {
-  $conn =& getDbConnection();
-  $date = gmdate('Y-m-d H:i:s');
-  $qdate = $conn->quote($date, 'timestamp');
-
-  $res =& $conn->queryOne(
-      'SELECT sessionId FROM sessions WHERE'
-      . ' wallId = ' . $conn->quote($wallId, 'integer')
-      . ' AND beginDate < ' . $qdate
-      . ' AND (endDate IS NULL OR endDate > ' . $qdate . ')',
-      'integer');
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  return $res;
-}
-
-function isTitleUnique($title) {
-  return !recordExists('walls', 'eventName', $title, 'text');
-}
-
-function isDesignIdValid($id) {
-  return recordExists('designs', 'designId', $id, 'integer');
-}
-
-function getWallUrlForPath($path) {
-  $scheme = 'http://';
-  $port   = intval($_SERVER['SERVER_PORT']) !== 80
-          ? ':' . $_SERVER['SERVER_PORT']
-          : '';
-  $path   = '/wall/' . $path;
-  $url    = $scheme . $_SERVER['SERVER_NAME'] . $port . $path;
-  return $url;
-}
-
-function getEditorUrlForPath($path) {
-  global $config;
-  return $config['editor']['url'] . $path;
-}
-
-function getPathForTitle($title) {
-  // Strip leading/trailing space, and
-  // convert fullwidth forms to halfwidth
-  $path = mb_convert_kana(trim($title), "as", "utf-8");
-  // Make lowercase, and
-  // convert whitespace to -
-  $path = strtr(strtolower($path), " \t", '--');
-  // URL encode
-  $path = rawurlencode($path);
-  // Check for duplicates
-  // If we have a clash, just generate a random ID and use that--the user can 
-  // make it something more sensible later if they wish
-  if (!isPathUnique($path))
-    $path = rawurlencode(uniqid());
-  return $path;
-}
-
-// Input: a URL-encoded path
-function isPathUnique($path) {
-  return !recordExists('walls', 'urlPath', $path, 'text');
-}
-
-function recordExists($table, $field, $value, $type) {
-  $conn =& getDbConnection();
-  $res =& $conn->query(
-      "SELECT * FROM $table WHERE $field = "
-      . $conn->quote($value, $type)
-      . " LIMIT 1");
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $exists = $res->numRows() > 0;
-  $res->free();
-  return $exists;
-}
-
-function getCurrentWallTimeByWallId($wallId) {
-  $conn =& getDbConnection();
-  $res =& $conn->query(
-      'SELECT walls.duration AS duration,designs.duration AS defaultduration FROM walls,designs WHERE walls.designId = designs.designId AND wallId = '
-    . $conn->quote($wallId, 'integer')
-  );
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
-  $currentDuration = 0;
-  if ($row = $res->fetchRow()) {
-    $duration = intval($row['duration']);
-    $defaultDuration = intval($row['defaultduration']);
-    $currentDuration = $duration != 0 ? $duration : $defaultDuration;
-  }
-  $conn->disconnect();
-  return getCurrentWallTimeByDuration($currentDuration);
-}
-
-function getCurrentWallDuration($wallId) {
-  $conn =& getDbConnection();
-  $res =& $conn->query(
-      'SELECT walls.duration AS duration,designs.duration AS defaultduration FROM walls,designs WHERE walls.designId = designs.designId AND wallId = '
-    . $conn->quote($wallId, 'integer')
-  );
-  if (PEAR::isError($res)) {
-    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
-    throw new KeyedException('db-error');
-  }
-  $conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
-  $currentDuration = 0;
-  if ($row = $res->fetchRow()) {
-    $duration = intval($row['duration']);
-    $defaultDuration = intval($row['defaultduration']);
-    $currentDuration = $duration != 0 ? $duration : $defaultDuration;
-  }
-  $conn->disconnect();
-  return $currentDuration;
-}
-
-function getCurrentWallTimeByDuration($duration) {
-  $timeparts = explode(" ",microtime());
-  $currentTimeMillis = bcadd(($timeparts[0]*1000),bcmul($timeparts[1],1000));
-  return $currentTimeMillis % $duration;
-}
-?>
+<?php
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+require_once("parapara.inc");
+require_once("db.inc");
+require_once("exceptions.inc");
+require_once("UriUtils.inc");
+
+// When updating this, be sure to update wall.js as well
+define("WALLMAKER_SESSION_NAME", "WMSESSID");
+
+// Given a user id, returns an array of walls owned by that user with the 
+// following information:
+//
+//   wallId
+//   event name
+//   design thumb URL
+//   whether they will display in the gallery or not
+//   creation date (UTC)
+//   modification date (UTC)
+//
+// The results will be sorted by creation date such that recently created walls 
+// sort before older walls.
+
+function getWallSummaryForUser($email) {
+  // XXX Convert this to use exceptions
+  // Get connection
+  global $config;
+  $mdb2 =& MDB2::factory($config['db']['dsn']);
+  if (PEAR::isError($mdb2)) {
+    error_log('Error connecting to DB: ' . $mdb2->getMessage()
+               . ', ' . $mdb2->getDebugInfo());
+    return null;
+  }
+
+  // Run query
+  $res =& $mdb2->query(
+      'SELECT walls.wallId, walls.eventName, designs.thumbUrl,'
+    . ' walls.galleryDisplay, walls.createDate, walls.modifyDate, walls.designId'
+    . ' FROM users, walls'
+    . ' LEFT JOIN designs on designs.designId = walls.designId'
+    . ' WHERE users.email = '
+    . $mdb2->quote($email, 'text')
+    . '   AND walls.owner = users.userId'
+    . ' ORDER BY walls.createDate DESC');
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    return null;
+  }
+
+  // Process each array so we can tweak the values and make them a little less 
+  // bound to the db schema
+  $result = array();
+  $mdb2->setFetchMode(MDB2_FETCHMODE_ASSOC);
+  while ($row = $res->fetchRow()) {
+    $result[] =
+      array(
+        'wallId' => $row['wallid'],
+        'eventName' => $row['eventname'],
+        'thumb' => $row['thumburl'],
+        'designId' => intval($row['designid']),
+        'galleryDisplay' => !!($row['gallerydisplay']),
+        'createDate' => $row['createdate'],
+        'modifyDate' => $row['modifydate']
+      );
+  }
+
+  // Tidy up and finish
+  $mdb2->disconnect();
+
+  return $result;
+}
+
+function createWall($params) {
+  // Get connection
+  $conn =& getDbConnection();
+
+  // Validate owner email
+  $email = trim(@$params['ownerEmail']);
+  if (!strlen($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
+    error_log("Bad or missing email when creating wall");
+    throw new KeyedException('server-error', 'No email for user');
+  }
+
+  // Fetch user ID for owner
+  $ownerId = getOrCreateUserIdFromEmail($email);
+
+  // Validate title
+  $title = trim(@$params['title']);
+  if (!strlen($title)) {
+    error_log("Empty title");
+    throw new KeyedException('empty-title');
+  }
+  // XXX Test this
+  if (!isTitleUnique($title)) {
+    error_log("Even with title '$title' already exists.");
+    throw new KeyedException('duplicate-title');
+  }
+
+  // Validate ID
+  $designId = intval(@$params['design']);
+  if ($designId < 1) {
+    error_log("Bad design ID: $designId");
+    throw new KeyedException('design-not-found', 'Bad design ID');
+  }
+  if (!isDesignIdValid($designId)) {
+    error_log("Could't find design ID " . $designId);
+    throw new KeyedException('design-not-found', 'ID not found');
+  }
+
+  // Get URLs
+  $path      = getPathForTitle($title);
+  $wallUrl   = getWallUrlForPath($path);
+  $editorUrl = getWallUrlForPath($path);
+
+  $shortUrl = shortenUrl($wallUrl);
+  if ($shortUrl == $wallUrl)
+    $shortUrl = NULL;
+
+  $editorShortUrl = shortenUrl($editorUrl);
+  if ($editorShortUrl == $editorUrl)
+    $editorShortUrl = NULL;
+
+  $date = gmdate('Y-m-d H:i:s');
+
+  // Run query
+  $query =
+    'INSERT INTO walls'
+    . ' (owner, designId, eventName, galleryDisplay, urlPath, shortUrl,'
+    . '  editorShortUrl, createDate, modifyDate)'
+    . ' VALUES '
+    . '(' . $conn->quote($ownerId, 'integer')
+    . ',' . $conn->quote($designId, 'integer')
+    . ',' . $conn->quote($title, 'text')
+    . ',TRUE' // galleryDisplay
+    . ',' . $conn->quote($path, 'text')
+    . ',' . (($shortUrl) ? $conn->quote($shortUrl, 'text') : 'NULL')
+    . ',' . (($editorShortUrl) ? $conn->quote($editorShortUrl, 'text') : 'NULL')
+    . ',' . $conn->quote($date, 'timestamp')
+    . ',' . $conn->quote($date, 'timestamp')
+    . ')';
+  $res =& $conn->query($query);
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+
+  // Get ID of newly created wall
+  $wallId = $conn->lastInsertID('walls', 'wallId');
+  if (PEAR::isError($wallId)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+
+  return intval($wallId);
+}
+
+function getOrCreateUserIdFromEmail($email) {
+  $conn =& getDbConnection();
+  $res =& $conn->queryOne(
+      'SELECT userId FROM users WHERE email = '
+    . $conn->quote($email, 'text')
+    . ' LIMIT 1',
+    'integer');
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+
+  // If user does not exist, add a record for them
+  if ($res >= 1)
+    return $res;
+
+  $res =& $conn->query('INSERT INTO users (email) VALUES ('
+    . $conn->quote($email, 'text')
+    . ')');
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+
+  $ownerId = $conn->lastInsertID('users', 'userId');
+  if (PEAR::isError($ownerId)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+
+  return $ownerId;
+}
+
+function getWall($wallId) {
+  $conn =& getDbConnection();
+  $res =& $conn->query(
+      'SELECT walls.designId,eventName,eventDescr,eventLocation,eventType,eventFinish,urlPath,shortUrl,editorShortUrl,walls.duration,galleryDisplay,passcode,designs.duration AS defaultduration FROM walls,designs WHERE walls.designId = designs.designId AND wallId = '
+    . $conn->quote($wallId, 'integer')
+  );
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $result = array();
+  $conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
+  if ($row = $res->fetchRow()) {
+    $result["designId"] = $row['designid'];
+    $result["eventName"] = $row['eventname'];
+    $result["eventDescr"] = $row['eventdescr'];
+    $result["eventLocation"] = $row['eventlocation'];
+    $result["eventType"] = $row['eventtype'];
+    $result["eventFinish"] = $row['eventfinish'];
+    $result["urlPath"] = $row['urlpath'];
+    $result["shortUrl"] = $row['shorturl'];
+    $result["editorShortUrl"] = $row['editorshorturl'];
+    $result["galleryDisplay"] = $row['gallerydisplay'];
+    $result["duration"] = $row['duration'];
+    $result["defaultDuration"] = $row['defaultduration'];
+    $result["passcode"] = $row['passcode'] != NULL ? strlen($row['passcode']) : 0;
+  }
+  $conn->disconnect();
+  return $result;
+}
+
+function updateWall($wallId, $name, $value, $type) {
+  $conn =& getDbConnection();
+  $qvalue = $conn->quote($value, $type);
+  $qwallid = $conn->quote($wallId, 'integer');
+  $query = 'UPDATE walls SET '.$name.'='.$qvalue.' WHERE wallId = '.$qwallid;
+  $res =& $conn->query($query);
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $conn->disconnect();
+}
+
+// Returns NULL if the wall is not found
+function getWallIdFromPath($path) {
+  $conn =& getDbConnection();
+  $res =& $conn->queryOne(
+      'SELECT wallId FROM walls WHERE urlPath = '
+      . $conn->quote(rawurlencode($path), 'text')
+      . ' LIMIT 1',
+      'integer');
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  return $res;
+}
+
+function startNewSession($wallId, $datetime) {
+  $conn =& getDbConnection();
+  $qwallid = $conn->quote($wallId, 'integer');
+  $qdatetime = $conn->quote($datetime, 'timestamp');
+  $query = 'INSERT INTO sessions(wallId,beginDate) VALUES('.$wallId.','.$qdatetime.')';
+  $res =& $conn->query($query);
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $conn->disconnect();
+}
+
+function closeLastSession($wallId, $datetime) {
+  $conn =& getDbConnection();
+  $qwallid = $conn->quote($wallId, 'integer');
+  $qdatetime = $conn->quote($datetime, 'timestamp');
+  //makes temp table for (You can't specify target table 'sessions' for update in FROM clause)
+  $query = 'UPDATE sessions SET endDate='.$qdatetime.' WHERE endDate IS NULL AND wallId='.$wallId.' AND sessionId=(SELECT temp.sessionId FROM (SELECT MAX(sessionId) AS sessionID FROM sessions WHERE wallId='.$wallId.') AS temp)';
+  $res =& $conn->query($query);
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $conn->disconnect();
+}
+
+// Returns NULL if there is no active session for the wall
+function getActiveSession($wallId) {
+  $conn =& getDbConnection();
+  $date = gmdate('Y-m-d H:i:s');
+  $qdate = $conn->quote($date, 'timestamp');
+
+  $res =& $conn->queryOne(
+      'SELECT sessionId FROM sessions WHERE'
+      . ' wallId = ' . $conn->quote($wallId, 'integer')
+      . ' AND beginDate < ' . $qdate
+      . ' AND (endDate IS NULL OR endDate > ' . $qdate . ')',
+      'integer');
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  return $res;
+}
+
+function isTitleUnique($title) {
+  return !recordExists('walls', 'eventName', $title, 'text');
+}
+
+function isDesignIdValid($id) {
+  return recordExists('designs', 'designId', $id, 'integer');
+}
+
+function getWallUrlForPath($path) {
+  $scheme = 'http://';
+  $port   = intval($_SERVER['SERVER_PORT']) !== 80
+          ? ':' . $_SERVER['SERVER_PORT']
+          : '';
+  $path   = '/wall/' . $path;
+  $url    = $scheme . $_SERVER['SERVER_NAME'] . $port . $path;
+  return $url;
+}
+
+function getEditorUrlForPath($path) {
+  global $config;
+  return $config['editor']['url'] . $path;
+}
+
+function getPathForTitle($title) {
+  // Strip leading/trailing space, and
+  // convert fullwidth forms to halfwidth
+  $path = mb_convert_kana(trim($title), "as", "utf-8");
+  // Make lowercase, and
+  // convert whitespace to -
+  $path = strtr(strtolower($path), " \t", '--');
+  // URL encode
+  $path = rawurlencode($path);
+  // Check for duplicates
+  // If we have a clash, just generate a random ID and use that--the user can 
+  // make it something more sensible later if they wish
+  if (!isPathUnique($path))
+    $path = rawurlencode(uniqid());
+  return $path;
+}
+
+// Input: a URL-encoded path
+function isPathUnique($path) {
+  return !recordExists('walls', 'urlPath', $path, 'text');
+}
+
+function recordExists($table, $field, $value, $type) {
+  $conn =& getDbConnection();
+  $res =& $conn->query(
+      "SELECT * FROM $table WHERE $field = "
+      . $conn->quote($value, $type)
+      . " LIMIT 1");
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $exists = $res->numRows() > 0;
+  $res->free();
+  return $exists;
+}
+
+function getCurrentWallTimeByWallId($wallId) {
+  $conn =& getDbConnection();
+  $res =& $conn->query(
+      'SELECT walls.duration AS duration,designs.duration AS defaultduration FROM walls,designs WHERE walls.designId = designs.designId AND wallId = '
+    . $conn->quote($wallId, 'integer')
+  );
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
+  $currentDuration = 0;
+  if ($row = $res->fetchRow()) {
+    $duration = intval($row['duration']);
+    $defaultDuration = intval($row['defaultduration']);
+    $currentDuration = $duration != 0 ? $duration : $defaultDuration;
+  }
+  $conn->disconnect();
+  return getCurrentWallTimeByDuration($currentDuration);
+}
+
+function getCurrentWallDuration($wallId) {
+  $conn =& getDbConnection();
+  $res =& $conn->query(
+      'SELECT walls.duration AS duration,designs.duration AS defaultduration FROM walls,designs WHERE walls.designId = designs.designId AND wallId = '
+    . $conn->quote($wallId, 'integer')
+  );
+  if (PEAR::isError($res)) {
+    error_log($res->getMessage() . ', ' . $res->getDebugInfo());
+    throw new KeyedException('db-error');
+  }
+  $conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
+  $currentDuration = 0;
+  if ($row = $res->fetchRow()) {
+    $duration = intval($row['duration']);
+    $defaultDuration = intval($row['defaultduration']);
+    $currentDuration = $duration != 0 ? $duration : $defaultDuration;
+  }
+  $conn->disconnect();
+  return $currentDuration;
+}
+
+function getCurrentWallTimeByDuration($duration) {
+  $currentTimeMillis = bcmul(microtime(true), 1000);
+  return bcmod($currentTimeMillis, $duration);
+}
+?>