inc/class_erErrorReportManager.inc

   1 <?php
   2 /**
   3  * @file class_erErrorReportManager.inc -- management of multiple error reports
   4  * @author Roland Hieber (roland.hieber@wilhelm-gym.net)
   5  * @date 18.10.2007
   6  *
   7  * Copyright © 2007 Roland Hieber
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27
  28 require_once("mod_error-reporter/class_erErrorReport.inc");
  29 require_once("mod_error-reporter/class_erConfig.inc");
  30 require_once("mod_error-reporter/functions.inc");
  31 require_once("db.inc");
  32 require_once("user.inc");
  33
  34 db_query("SET DATESTYLE = ISO ");
  35
  36 /**
  37  * @page errorreportmanager_constants erErrorReportManager Constants
  38  * @section errorreportmanager_sorting Sorting constants
  39  * - @b ER_ERM_SORT_UID: Array is sorted by unique ID
  40  * - @b ER_ERM_SORT_DATE: Array is sorted by the creation date
  41  * - @b ER_ERM_SORT_OWNER: Array is sorted by owner of the error report
  42  * - @b ER_ERM_SORT_MACHINE: Array is sorted by the machine to which the
  43  *      report refers
  44  * - @b ER_ERM_SORT_TEXT: Array is sorted by text / notes
  45  * - @b ER_ERM_SORT_COMMENT: Array is sorted by comment
  46  * - @b ER_ERM_SORT_COMMENTOWNER: Array is sorted by the account name of the
  47  *      person who wrote the comment
  48  * - @b ER_ERM_SORT_VISIBILITY: Array is sorted by hide status
  49  * @section errorreportmanager_sorting_dir Sorting direction constants
  50  * - @b ER_ERM_SORT_ASC: Array is sorted in ascending order
  51  * - @b ER_ERM_SORT_DESC: Array is sorted in descending order
  52  */
  53 define("ER_ERM_SORT_UID", 0);          /*< sort by unique ID */
  54 define("ER_ERM_SORT_DATE", 1);         /*< sort by date */
  55 define("ER_ERM_SORT_OWNER", 2);        /*< sort by owner */
  56 define("ER_ERM_SORT_MACHINE", 3);      /*< sort by machine to which the */
  57                                        /*< report refers */
  58 define("ER_ERM_SORT_TEXT", 4);         /*< sort by text*/
  59 define("ER_ERM_SORT_COMMENT", 5);      /*< sort by comment */
  60 define("ER_ERM_SORT_COMMENTOWNER", 6); /*< sort by account name of the */
  61                                        /*< person who wrote the comment */
  62 define("ER_ERM_SORT_VISIBILITY", 6);   /*< sort by visibility */
  63
  64 define("ER_ERM_SORT_ASC", 0);          /*< sort ascending */
  65 define("ER_ERM_SORT_DESC", 1);         /*< sort descending */
  66
  67 /**
  68  * Management of error reports
  69  *
  70  * This class allows a comprehensive management of error reports.
  71  *
  72  * @par Error reports management
  73  * To add an error reports, simply create an instance of this class and call
  74  * writeErrorReport() with an erErrorReport object as the only parameter. If
  75  * the $nUid member of the erErrorReport object is <tt>null</tt>,
  76  * writeErrorReport() will use the next ID which is not used in the table.
  77  *
  78  * @par
  79  * An error report that has been written to the database can be changed using
  80  * writeErrorReport(), setting the $nUid member of the erErrorReport parameter
  81  * to the UID of the error report to be changed.
  82  *
  83  * @par
  84  * To change the visibility of an error report to @e hidden, call
  85  * setErrorReportDoneFlag() with the UID of the error report and set the second
  86  * parameter to <tt>false</tt>.
  87  *
  88  * @par
  89  * To delete an error report from the database, call deleteErrorReport() with
  90  * the UID of the error report you want to delete.
  91  *
  92  * @par
  93  * Error reports can be retrieved by their UID (getErrorReportByID()), by
  94  * creation date (getErrorReportsByDate()), by owner (getErrorReportsByOwner()),
  95  * by machine to which the report refers (getErrorReportsByMachine()) and by
  96  * the person who wrote the comment (getErrorReportsByCommentOwner()). All
  97  * error reports in the database can be retrieved using getErrorReports(). All
  98  * of these functions return a object of type erErrorReport or an array of
  99  * erErrorReport objects.
 100  *
 101  * @par Example
 102  * The following example creates a new error report “This doesn’t work”, written
 103  * by the user “testuser” on February 5, 2007, which refers to the machine
 104  * “Client-26” and is not visible for non-admin users. Then it adds a nice
 105  * comment, makes the error report visible and writes it to the database.
 106  * @code
 107  * <?php
 108  * require_once("class_erErrorReportManager.inc");
 109  * $obj = new erErrorReportManager;
 110  * $em = new erErrorReport(strtotime("2007-02-05"), "testuser", "Client-26",
 111  *   "This doesn’t work", false);
 112  * $em->setComment("We know that already", "admin");
 113  * // $em->nUid is null, so writeErrorReport() calculates the UID by itself
 114  * $nNewID = $obj->writeErrorReport($em);
 115  * @endcode
 116  */
 117
 118 class erErrorReportManager {
 119
 120
 121   /**
 122    * (object of type erConfig) pointer to the configuration class
 123    */
 124   protected $objcfg;
 125
 126   /**
 127    * Constructor
 128    * @param $objcfg (object of type erConfig) Pointer to the configuration
 129    * class for retrieving the
 130    *  configuration data
 131    * @return erErrorReportManager
 132    */
 133   public function __construct(&$objcfg) {
 134     $this->objcfg = &$objcfg;
 135   }
 136
 137   /////////////////////////////////// QUERYING /////////////////////////////////
 138
 139   /**
 140    * @name Quering
 141    * @{ */
 142
 143   /**
 144    * Get the number of reported errors
 145    * @return int
 146    */
 147   public function getNumErrorReports() {
 148     $ar = pg_fetch_array(db_query("SELECT COUNT(*) AS count FROM ".
 149       "mod_errorreporter;"), 0);
 150     return intval($ar["count"]);
 151   }
 152
 153   /**
 154    * Get all error reports in the database.
 155    * If this function fails, it returns <tt>null</tt>. Call getLastError() to
 156    *  get more information.
 157    * @param $arcSort (array of constants) Defines the sorting of the returned
 158    *  array. See the documentation of the $arcSort parameter of
 159    *  buildOrderByClause() for more information.
 160    * @return array of objects of type erErrorReport
 161    */
 162   public function getErrorReports($arcSort = array(ER_ERM_SORT_UID =>
 163     ER_ERM_SORT_ASC)) {
 164     return $this->readFromSQL("", $arcSort);
 165   }
 166
 167   /**
 168    * Get an error report by its unique ID in database.
 169    * If this function fails, it returns <tt>null</tt>.
 170    * @param $nID (int) ID of the error report
 171    * @return erErrorReport
 172    */
 173   public function getErrorReportByID($nID) {
 174     $arReturn = $this->readFromSQL("er_uid = ".qdb(intval($nID)));
 175     if(is_array($arReturn) and count($arReturn) > 0) {
 176       return $arReturn[0]; // return as scalar
 177     } else {
 178       return null;
 179     }
 180   }
 181
 182   /**
 183    * Get all error reports which have been created on the specified date.
 184    * If this function fails, it returns <tt>null</tt>. Call getLastError() to
 185    *  get more information.
 186    * @param $tsDate (timestamp) Date
 187    * @param $arcSort (array of constants) Defines the sorting of the returned
 188    *  array. See the documentation of the $arcSort parameter of
 189    *  buildOrderByClause() for more information.
 190    * @return array of objects of type erErrorReport
 191    */
 192   public function getErrorReportsByDate($tsDate, $arcSort =
 193     array(ER_ERM_SORT_UID => ER_ERM_SORT_ASC)) {
 194     return $this->readFromSQL("er_date = ".qdb(date("Y\-m\-d", $tsDate)), $arcSort);
 195   }
 196
 197   /**
 198    * Get all error reports which have been created by the specified user.
 199    * If this function fails, it returns <tt>null</tt>. Call getLastError() to
 200    * get more information.
 201    * @param $strAct (string) Account name
 202    * @param $arcSort (array of constants) Defines the sorting of the returned
 203    *  array. See the documentation of the $arcSort parameter of
 204    *  buildOrderByClause() for more information.
 205    * @return array of objects of type erErrorReport
 206    */
 207   public function getErrorReportsByOwner($strAct, $arcSort =
 208     array(ER_ERM_SORT_UID => ER_ERM_SORT_ASC)) {
 209     return $this->readFromSQL("er_act = ".qdb($strAct), $arcSort);
 210   }
 211
 212   /**
 213    * Get all error reports which are related to a specified machine.
 214    * If this function fails, it returns <tt>null</tt>. Call getLastError() to
 215    *  get more information.
 216    * @param $strMachine (string) Machine name
 217    * @param $arcSort (array of constants) Defines the sorting of the returned
 218    *  array. See the documentation of the $arcSort parameter of
 219    *  buildOrderByClause() for more information.
 220    * @return array of objects of type erErrorReport
 221    */
 222   public function getErrorReportsByMachine($strMachine,
 223     $arcSort = array(ER_ERM_SORT_UID => ER_ERM_SORT_ASC)) {
 224     return $this->readFromSQL("er_machine = ".qdb($strMachine), $arcSort);
 225   }
 226
 227   /**
 228    * Get all error reports which have been commented by the specified user.
 229    * If this function fails, it returns <tt>null</tt>. Call getLastError() to
 230    *  get more information.
 231    * @param $strAct (string) Account name
 232    * @param $arcSort (array of constants) Defines the sorting of the returned
 233    *  array. See the documentation of the $arcSort parameter of
 234    *  buildOrderByClause() for more information.
 235    * @return array of objects of type erErrorReport
 236    */
 237   public function getErrorReportsByCommentOwner($strAct,
 238     $arcSort = array(ER_ERM_SORT_UID => ER_ERM_SORT_ASC)) {
 239     return $this->readFromSQL("er_commentact = ".qdb($strAct), $arcSort);
 240   }
 241
 242   /*@}*/
 243
 244   /**
 245    * Get datasets from the SQL tables.
 246    * This function should not be called directly. Use the getBy* functions
 247    *  instead. If this function fails, it returns <tt>null</tt>. Call
 248    *  getLastError() to get more information.
 249    * @internal
 250    * @param $strWhere (string) Parameters for the SQL WHERE clause
 251    * @param $arcSort (array of constants) Defines the sorting of the returned
 252    *  array. See the documentation of the $arcSort parameter of
 253    *  buildOrderByClause() for more information.
 254    * @return array of objects of type erErrorReport
 255    */
 256   protected function readFromSQL($strWhere = "", $arcSort =
 257     array(ER_ERM_SORT_UID => ER_ERM_SORT_ASC)) {
 258     $arReturn = array();
 259
 260     // only allow visible reports for non-admins, but all reports for
 261     // admins and owners
 262     if($this->objcfg->userIsAdmin()) {
 263       $strWhereClause = (trim($strWhere) == "") ? "" : "WHERE $strWhere";
 264     } else {
 265       $strWhereClause = "WHERE ".((trim($strWhere) == "") ? "" :
 266         "$strWhere AND ").sprintf("((er_act = '%s') or (er_hidden IS NULL OR ".
 267         " NOT er_hidden))", $_SESSION["act"]);
 268     }
 269
 270     $strSortClause = $this->buildOrderByClause($arcSort);
 271
 272     // fetch the error reports
 273     $hQuery = db_query("SELECT * FROM mod_errorreporter $strWhereClause ".
 274       "$strSortClause;");
 275     if(!is_resource($hQuery)) {
 276       setLastError(ER_ERROR_SQL);
 277       return null;
 278     }
 279     while($arResult = pg_fetch_array($hQuery)) {
 280       $er = new erErrorReport(strtotime($arResult["er_date"]),
 281         $arResult["er_act"], $arResult["er_machine"], $arResult["er_text"],
 282         $arResult["er_hidden"] == "t");
 283       $er->setUid($arResult["er_uid"]);
 284       $er->setComment($arResult["er_comment"], $arResult["er_commentact"]);
 285       $arReturn[] = $er;
 286     }
 287     return $arReturn;
 288   }
 289
 290   /**
 291    * Build a ORDER BY clause from an array.
 292    * This helper function takes an array of sorting constants as input and
 293    * returns an ORDER BY clause. The values in the clause are in the same order
 294    * as the constants in the array. The function in the following example
 295    * returns an ORDER BY clause where the datasets are first sorted ascending
 296    * by visibility, then descending by the machine name to which they refer and
 297    * finally ascending by their UID:
 298    * @code
 299    * $strOrder = buildOrderClause(array(
 300    *   ER_ERM_SORT_VISIBILITY => ER_ERM_SORT_ASC,
 301    *   ER_ERM_SORT_MACHINE => ER_ERM_SORT_DESC,
 302    *   ER_ERM_SORT_UID => ER_ERM_SORT_ASC));
 303    * echo $strOrder;
 304    * @endcode
 305    * The output is: <tt>ORDER BY er_hidden ASC, er_machine DESC, er_uid ASC</tt>
 306    * @internal
 307    * @param $arcSort (array of constants) The array which declares the order of
 308    * the SQL rows. Use @ref errorreportmanager_sorting as keys and
 309    * @ref errorreportmanager_sorting_dir as values.
 310    * @return string
 311    */
 312   protected function buildOrderByClause($arcSort) {
 313     // build the sorting clause
 314     $arstrSort = array();
 315     foreach($arcSort as $cSort => $cDir) {
 316       switch($cSort) {
 317         case ER_ERM_SORT_UID:
 318           $arstrSort[] = "er_uid ".($cDir == ER_ERM_SORT_DESC ? "DESC" : "ASC");
 319           break;
 320         case ER_ERM_SORT_DATE:
 321           $arstrSort[] = "er_date ".($cDir == ER_ERM_SORT_DESC ? "DESC" :
 322             "ASC");
 323           break;
 324         case ER_ERM_SORT_OWNER:
 325           $arstrSort[] = "er_act ".($cDir == ER_ERM_SORT_DESC ? "DESC" : "ASC");
 326           break;
 327         case ER_ERM_SORT_MACHINE:
 328           $arstrSort[] = "er_machine ".($cDir == ER_ERM_SORT_DESC ? "DESC" :
 329             "ASC");
 330           break;
 331         case ER_ERM_SORT_TEXT:
 332           $arstrSort[] = "er_text ".($cDir == ER_ERM_SORT_DESC ? "DESC" :
 333             "ASC");
 334           break;
 335         case ER_ERM_SORT_COMMENT:
 336           $arstrSort[] = "er_comment ".($cDir == ER_ERM_SORT_DESC ? "DESC" :
 337             "ASC");
 338           break;
 339         case ER_ERM_SORT_COMMENTOWNER:
 340           $arstrSort[] = "er_commentact ".($cDir == ER_ERM_SORT_DESC ? "DESC" :
 341             "ASC");
 342           break;
 343         case ER_ERM_SORT_VISIBILITY:
 344           $arstrSort[] = "er_hidden ".($cDir == ER_ERM_SORT_DESC ? "DESC" :
 345             "ASC");
 346           break;
 347       }
 348     }
 349     return ("ORDER BY ".join(", ", $arstrSort));
 350   }
 351
 352   ////////////////////////// ERROR MESSAGE MANAGEMENT //////////////////////////
 353
 354   /**
 355    * @name Error report management
 356    * @{
 357    */
 358
 359   /**
 360    * Insert or update an error report in the database.
 361    * When the $nUid member of the $erErrorReport object is <tt>null</tt>, a new
 362    * unique ID is assigned and the error report is written to the database.
 363    * Otherwise, the record having the respective UID in the table is updated.
 364    * @param $er (erErrorReport)
 365    * @return (int) The unique ID of the inserted or updated record.
 366    * @throws Exception
 367    */
 368   public function writeErrorReport(erErrorReport $er) {
 369     if(!$this->objcfg->userHasAccess() and (!$this->userIsOwner($er->nUid) or
 370       ($er->getUid() == null and !($this->objcfg->userIsAdmin())))) {
 371       throw new Exception(ER_ERROR_ACCESS_DENIED);
 372     }
 373
 374     $strWhere = null;
 375     $strLog = "";
 376
 377     // Update or insert?
 378     $arPut = array();
 379     if($er->getUid() == null) {
 380       // er_uid is now serial
 381       /*$hQuery = db_query("SELECT MAX(er_uid) AS id FROM mod_errorreporter;");
 382       if(!is_resource($hQuery)) {
 383         setLastError(ER_ERROR_SQL);
 384         return -1;
 385       }
 386       $arResult = pg_fetch_array($hQuery);
 387       $er->setUid(intval($arResult["id"]) + 1);*/
 388       $strLog = sprintf("Fehlermeldung für Rechner „%s“ eingetragen.",
 389         $er->getMachine());
 390     } else {
 391       $strWhere = "er_uid = ".qdb(intval($er->getUid()));
 392       $oOldReport = $this->getErrorReportByID($er->getUid());
 393       $strLog = sprintf("Fehlermeldung geändert, Rechner war „%s“, Text war ".
 394         "„%s“. Neuer Rechner: „%s“, neuer Text: „%s“, Kommentar: %s",
 395         $oOldReport->getMachine(), $oOldReport->getText(), $er->getMachine(),
 396         $er->getText(), (strlen($er->getComment()) > 0) ?
 397         "„" . $er->getComment() . "“" : "(leer)");
 398     }
 399     $arPut["er_date"] = date("Y\-m\-d\ G\:i\:s", $er->getDate());
 400     $arPut["er_act"] = $er->getOwner();
 401     $arPut["er_machine"] = $er->getMachine();
 402     $arPut["er_text"] = $er->getText();
 403     $arPut["er_comment"] = $er->getComment();
 404     $arPut["er_commentact"] = $er->getCommentOwner();
 405     $arPut["er_hidden"] = $er->isHidden() ? "true" : "false";
 406     db_store("mod_errorreporter", $arPut, $strWhere);
 407
 408     erInsertLog($strLog);
 409
 410     // send notification mail, but only if the message is new
 411     if($this->objcfg->isMailNotify() and $er->getUid() == null) {
 412       $strMailText = sprintf("<html><body>\nEin Benutzer hat eine ".
 413         "Fehlermeldung mit dem Fehlermeldungs-Assistenten abgeschickt. ".
 414         "Nachfolgend finden sich Angaben über den Fehler.\n".
 415         "<table>\n<tr><td>Fehler gemeldet von:</td><td>%s</td></tr>\n".
 416         "<tr><td>Datum:</td><td>%s</td></tr>\n".
 417         "<tr><td>Betroffener Rechner:</td><td>%s</td></tr>\n".
 418         "<tr><td colspan='2'>%s</td></tr>\n</table>\n<hr />\n".
 419         "Diese Mail wurde automatisch generiert.\n".
 420         "</body></html>", q(erGetRealUserName($er->getOwner())),
 421         q(date("d\.m\.Y\ G\:i\:s", $er->getDate())), q($er->getMachine()),
 422         q($er->getText()));
 423       $strMailSubject = sprintf("%s hat einen Fehler im System gemeldet",
 424         q(erGetRealUserName($er->getOwner())));
 425       $strMailHeader = sprintf("From: %s <%s>\n".
 426         "Content-Type: text/html; charset=utf-8",
 427         q(erGetRealUserName($er->getOwner())), user_mail_addr($er->getOwner()));
 428       mail($this->objcfg->getMailNotifyAddr(), $strMailSubject, $strMailText,
 429         $strMailHeader);
 430     }
 431
 432     return $er->getUid();
 433   }
 434
 435   /**
 436    * Delete an error report from the database.
 437    * @param $nErrorReportID (int) Unique ID of the error report to delete or -1
 438    *  if an error occured. In this case, call getLastError() to get more
 439    *  information.
 440    */
 441   public function deleteErrorReport($nErrorReportID) {
 442     if(!($this->objcfg->userIsAdmin() or $this->userIsOwner($nErrorReportID))) {
 443       setLastError(ER_ERROR_ACCESS_DENIED);
 444       return -1;
 445     }
 446
 447     $oOldReport = $this->getErrorReportByID($nErrorReportID);
 448     db_query(sprintf("DELETE FROM mod_errorreporter WHERE er_uid = '%d';",
 449       intval($nErrorReportID)));
 450     erInsertLog(sprintf("Fehlermeldung gelöscht, Rechner war „%s“, Text war ".
 451       "„%s“", $oOldReport->getMachine(), $oOldReport->getText()));
 452   }
 453
 454   /**
 455    * Determine if the current user is the owner of a specified error report.
 456    * If this function fails, call getLastError() to get more information.
 457    * @param $nID (int) Unique ID of the error report
 458    * @return bool
 459    */
 460   public function userIsOwner($nID) {
 461     if(!$_SESSION["act"]) {
 462       return false;   // user is not logged in
 463     } else {
 464       $hQuery = db_query(sprintf("SELECT er_act FROM mod_errorreporter WHERE ".
 465         "er_uid = %d;", intval($nID)));
 466       if(!is_resource($hQuery)) {
 467         setLastError(ER_ERROR_SQL);
 468         return false;
 469       }
 470       $arResult = pg_fetch_array($hQuery);
 471       return ($arResult["er_act"] == $_SESSION["act"]);
 472     }
 473   }
 474 }
 475 ?>