includes/mod_roomReservationBookingsManager.inc

   1 <?php
   2 /**
   3  * @file mod_roomReservationBookingsManager.inc
   4  * Class to manage a set of bookings
   5  * @author Roland Hieber (roland.hieber@wilhelm-gym.net)
   6  * @date 23.11.2007
   7  *
   8  * Copyright © 2007 Roland Hieber
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining
  11  * copy of this software and associated documentation files (the "Software"),
  12  * to deal in the Software without restriction, including without limitation
  13  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  14  * and/or sell copies of the Software, and to permit persons to whom the
  15  * Software is furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  21  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  24  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  25  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  26  * THE SOFTWARE.
  27  */
  28
  29 require_once("sec/secure.inc");
  30 require_once("functions.inc");
  31 require_once("mod_room-reservation/mod_roomReservationConfig.inc");
  32 require_once("mod_room-reservation/mod_roomReservationBooking.inc");
  33 require_once("format.inc");
  34
  35 db_query("SET DATESTYLE = ISO;");
  36
  37 /**
  38  * Management of a set of bookings
  39  * @todo finish, document
  40  */
  41 class mod_roomReservationBookingsManager {
  42
  43   /** (mod_roomReservationConfig) Reference to the configuration object */
  44   protected $oCfg;
  45
  46   /***************************************************************************/
  47   /**
  48    * @name Constructor
  49    * @{
  50    * Constructor.
  51    * @param $oCfg (mod_roomReservationConfig) Reference to the configuration
  52    * @return mod_roomReservationBookingsManager
  53    */
  54   function __construct(mod_roomReservationConfig &$oCfg) {
  55     $this->oCfg = $oCfg;
  56   }
  57
  58   /***************************************************************************/
  59   /**
  60    * @}
  61    * @name Retrieving bookings
  62    * @{
  63    */
  64
  65   /**
  66    * Fetch a booking with the given unique ID from the SQL table
  67    * @param $nUid (int) Unique ID of the booking
  68    * @return mod_roomReservationBooking
  69    */
  70   public static function getBookingByUid($nUid) {
  71     $h = db_query("SELECT * FROM mod_roomreservation_bookings WHERE rrb_uid = $1;", $nUid);
  72     $a = pg_fetch_array($h);
  73     $o = new mod_roomReservationBooking($a["rrb_room"], strtotime($a["rrb_date"]),
  74       intval($a["rrb_tsfirst"]), intval($a["rrb_tslast"]), $a["rrb_act"],
  75       $a["rrb_reason"], intval($a["rrb_interval"]));
  76     $o->setUid(intval($a["rrb_uid"]));
  77     return $o;
  78   }
  79
  80   /**
  81    * Test if there is a booking which takes place on the specified position at
  82    * the specified date.
  83    * @param $strRoom (string) Name of the room
  84    * @param $tsDate (timestamp) The date
  85    * @param $nTimeslice (int) The number of the timeslice
  86    * @return mod_roomReservationBooking The booking which takes place on the
  87    *  specified time or <tt>null</tt> if no booking could be found.
  88    */
  89   public static function getBookingByTimeslice($strRoom, $tsDate,
  90     $nTimeslice) {
  91     $a = mod_roomReservationBookingsManager::getOverlappingBookings(
  92       new mod_roomReservationBooking($strRoom, $tsDate, $nTimeslice,
  93       $nTimeslice, null, null));
  94     return isset($a[0]) ? $a[0] : null;
  95   }
  96
  97   /**
  98    * Get all bookings in database which overlap with the given booking.
  99    * @param $ob (mod_roomReservationBooking) New booking that should be tested
 100    *  if it overlaps
 101    * @return array with elements of type mod_roomReservationBooking
 102    */
 103   public static function getOverlappingBookings(
 104     mod_roomReservationBooking $ob) {
 105     // TODO: Test for bookings that only take place every n.th week (modulo n)
 106
 107     // Two bookings overlap, when they are on the same day and if
 108     // old beginning < new ending  AND  old ending > new beginning
 109     $hQuery = db_query("SELECT * FROM mod_roomreservation_bookings WHERE ".
 110       "rrb_room = $1 AND ((rrb_interval > 0 AND EXTRACT(DOW FROM rrb_date) ".
 111       "= $2) OR (rrb_interval = 0 AND rrb_date = $3)) AND rrb_tsfirst <= ".
 112       "$4 AND rrb_tslast >= $5 ORDER BY rrb_tsfirst;", $ob->getRoom(),
 113       date("w", $ob->getDate()), date("Y-m-d", $ob->getDate()),
 114       intval($ob->getTsLast()), intval($ob->getTsFirst()));
 115     $aoReturn = array();
 116     while($aResult = pg_fetch_array($hQuery)) {
 117       $aoReturn[] = mod_roomReservationBookingsManager::getBookingByUid(
 118         $aResult["rrb_uid"]);
 119     }
 120     return $aoReturn;
 121   }
 122
 123   /***************************************************************************/
 124   /**
 125    * @}
 126    * @name Management of bookings
 127    * @{
 128    */
 129
 130   /**
 131    * Insert or update a booking in the database.
 132    * The function throws an AccessException if the user was not allowed to
 133    * write the booking, or an SQLException if there was an error while trying
 134    * to insert or update the booking into the database.
 135    * @param $ob (mod_roomReservationBooking) Booking to write to the database
 136    * @return (int) The UID of the written booking
 137    * @throws SQLException, AccessException
 138    * @todo document
 139    */
 140   function write(mod_roomReservationBooking $ob) {
 141     // protect access
 142     if(($ob->getUid() != null and !$this->oCfg->userIsAdmin() and
 143       !$this->userIsOwner($ob->nUid)) or
 144       ($ob->getUid() == null and !$this->oCfg->userCanBook())) {
 145       throw new AccessException(MOD_ROOM_RESERVATION_ERROR_ACCESS_DENIED);
 146     }
 147
 148     $strWhere = null;
 149     $strLog = "";
 150
 151     // check if everything is right and throw exceptions
 152     if(trim($ob->getAct()) == "") {
 153       $ob->setAct($SESSION["act"]);
 154     } elseif(!isAct($ob->getAct())) {
 155       throw new Exception(MOD_ROOM_RESERVATION_ERROR_NO_SUCH_ACCOUNT);
 156       return false;
 157     }
 158     if($ob->getTsFirst() > $ob->getTsLast()) {
 159       throw new SQLException(MOD_ROOM_RESERVATION_ERROR_END_BEFORE_BEGIN);
 160       return false;
 161     }
 162     if(trim($ob->getReason()) == "") {
 163       throw new SQLException(MOD_ROOM_RESERVATION_ERROR_NO_REASON);
 164       return false;
 165     }
 166
 167     // Test for overlapping bookings
 168     if($this->getOverlappingBookings($ob) != array()) {
 169       throw new SQLException(MOD_ROOM_RESERVATION_ERROR_BOOKING_OVERLAPS);
 170       return false;
 171     }
 172
 173     // Show real times in log, but don't use the user's locale!
 174     $oTsB = $this->oCfg->getTimesliceBeginnings(false);
 175     $oTsE = $this->oCfg->getTimesliceEndings(false);
 176
 177     // Update or insert?
 178     if($ob->getUid() == null) {
 179       // No UID yet, insert new booking
 180       $strLog = sprintf("Raum „%s“ am %s von %s bis %s gebucht ".
 181         "(Begründung: %s)", $ob->getRoom(), date("d\.m\.Y", $ob->getDate()),
 182         gmdate("G:i", $oTsB[$ob->getTsFirst()]), gmdate("G:i",
 183         $oTsE[$ob->getTsLast()]), $ob->getReason());
 184     } else {
 185       // Update an existing booking
 186       // @todo write old and new times into log
 187       $strWhere = "rs_uid = ".qdb(intval($ob->getUid()));
 188       $strLog = sprintf("Buchung im Raum „%s“ auf %s von %s bis %s ".
 189         "geändert (Begründung: „%s“)", $ob->getRoom(), date("d\.m\.Y",
 190         $ob->getDate()), gmdate("G:i", $oTsB[$ob->getTsFirst()]), gmdate("G:i",
 191         $oTsE[$ob->getTsLast()]), $ob->getReason());
 192     }
 193     $aPut["rrb_room"] = $ob->getRoom();
 194     $aPut["rrb_date"] = date("Y\-m\-d", $ob->getDate());
 195     $aPut["rrb_tsfirst"] = intval($ob->getTsFirst());
 196     $aPut["rrb_tslast"] = intval($ob->getTsLast());
 197     $aPut["rrb_act"] = $ob->getAct();
 198     $aPut["rrb_reason"] = $ob->getReason();
 199     $aPut["rrb_interval"] = intval($ob->getInterval());
 200
 201     // @todo test if the foreign keys are being violated and throw an error
 202     // message if neccessary
 203     db_store("mod_roomreservation_bookings", $aPut, $strWhere);
 204
 205     $hQuery = db_query("SELECT currval('mod_roomreservation_bookings_rrb_uid_seq');");
 206     $nNewUid = pg_fetch_result($hQuery, 0, "currval");
 207     ##############
 208     #FIXME remove this
 209     echo "inserted new UID: $nNewUid<br />";
 210     #####
 211
 212     rrInsertLog($strLog);
 213
 214     // Return new UID
 215     return $nNewUid;
 216   }
 217
 218   /**
 219    * Delete a booking from the database
 220    * @param $nUid (int) Unique ID of the booking
 221    * @return (bool) <tt>true</tt> on success, otherwise <tt>false</tt>.
 222    * @todo test
 223    */
 224   public function delete($nUid) {
 225     // Only administrators and owners are allowed to delete bookings
 226     if(!($this->oCfg->userIsAdmin() or $this->userIsOwner($nUid))) {
 227       throw new AccessException(MOD_ROOM_RESERVATION_ERROR_ACCESS_DENIED);
 228       return false;
 229     }
 230
 231     // Don't use the user's locale!
 232     $oTsB = $this->oCfg->getTimesliceBeginnings(false);
 233     $oTsE = $this->oCfg->getTimesliceEndings(false);
 234     $ob = $this->getBookingByUid($nUid);
 235     $strLog = sprintf("Buchung in Raum „%s“ am %s von %s bis %s ".
 236       "gelöscht (Begründung war: %s)", $ob->getRoom(), date("d\.m\.Y",
 237       $ob->getDate()), gmdate("G:i", $oTsB[$ob->getTsFirst()]), gmdate("G:i",
 238       $oTsE[$ob->getTsLast()]), $ob->getReason());
 239     // Delete it from the database
 240     if(!db_query("DELETE FROM mod_roomreservation_bookings WHERE ".
 241         "rrb_uid = $1;", $nUid)) {
 242       throw new SQLException(MOD_ROOM_RESERVATION_ERROR_SQL);
 243       return false;
 244     } else {
 245       rrInsertLog($strLog);
 246       return true;
 247     }
 248   }
 249
 250   /**
 251    * Determine if the current user is the owner of a specified error report.
 252    * If this function fails, call getLastError() to get more information.
 253    * @param $nID (int) Unique ID of the error report
 254    * @throws SQLException
 255    * @return bool
 256    */
 257   public static function userIsOwner($nID) {
 258     if(!isset($_SESSION["act"])) {
 259       return false;   // user is not logged in
 260     } else {
 261       $hQuery = db_query("SELECT rrb_act FROM mod_roomreservation_bookings WHERE ".
 262         "rrb_uid = $1;", intval($nID));
 263       if(!is_resource($hQuery)) {
 264         throw new SQLException(MOD_ROOM_RESERVATION_ERROR_SQL);
 265         return false;
 266       }
 267       $arResult = pg_fetch_array($hQuery);
 268       return ($arResult["rrb_act"] == $_SESSION["act"]);
 269     }
 270   }
 271 }
 272 ?>