api.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # Iris Studios Shared Object Framework [#]issoversion[#]
   5 || # Copyright ©2002-[#]year[#] Iris Studios, Inc.
   6 || #
   7 || # This program is free software; you can redistribute it and/or modify
   8 || # it under the terms of the GNU General Public License as published by
   9 || # the Free Software Foundation; version [#]gpl[#] of the License.
  10 || #
  11 || # This program is distributed in the hope that it will be useful, but
  12 || # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13 || # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  14 || # more details.
  15 || #
  16 || # You should have received a copy of the GNU General Public License along
  17 || # with this program; if not, write to the Free Software Foundation, Inc.,
  18 || # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  19 || ###################################################################
  20 \*=====================================================================*/
  21
  22 /**
  23 * Abstract Datamanger API
  24 * api.php
  25 *
  26 * @package      ISSO
  27 */
  28
  29 if (!defined('REQ_AUTO'))
  30 {
  31         /**
  32         * Auto-increasing value
  33         */
  34         define('REQ_AUTO', -1);
  35
  36         /**
  37         * Set by a cusotm set_*() function
  38         */
  39         define('REQ_SET', 2);
  40
  41         /**
  42         * Index for cleaning type
  43         */
  44         define('F_TYPE', 0);
  45
  46         /**
  47         * Index for requirement type
  48         */
  49         define('F_REQ', 1);
  50
  51         /**
  52         * Index for verification type
  53         */
  54         define('F_VERIFY', 2);
  55
  56         /**
  57         * Index for relation
  58         */
  59         define('F_RELATION', 3);
  60
  61         /**
  62         * Relation index for file name, relative to ISSO->apppath
  63         */
  64         define('F_RELATION_FILE', 0);
  65
  66         /**
  67         * Relation index for class name
  68         */
  69         define('F_RELATION_CLASS', 1);
  70
  71         /**
  72         * Relation index for field-link alternate name
  73         */
  74         define('F_RELATION_ALTFIELD', 2);
  75 }
  76
  77 /**
  78 * Abstract API
  79 *
  80 * Abstract class that is used as an API base for most common database interaction
  81 * schemes. Creates a simple structure that holds data and can update, delete, and
  82 * insert.
  83 *
  84 * @author               Iris Studios, Inc.
  85 * @copyright    Copyright ©2002 - [#]year[#], Iris Studios, Inc.
  86 * @version              $Revision$
  87 * @package              ISSO
  88 *
  89 */
  90 class API
  91 {
  92         /**
  93         * Registry object
  94         * @var  object
  95         * @access       protected
  96         */
  97         var $registry = null;
  98
  99         /**
 100         * Fields: used for verification and sanitization
 101         * NAME => array(TYPE, REQUIRED, VERIFY METHOD (:self for self-named method), RELATION => array(FILE, CLASS IN FILE, ALTERNATE FIELD NAME))
 102         * @var  array
 103         * @access       protected
 104         */
 105         var $fields = array();
 106
 107         /**
 108         * Values array: sanitized and verified field values
 109         * @var  array
 110         * @access       public
 111         */
 112         var $values = array();
 113
 114         /**
 115         * Fields that were manually set with set(), not by using set_existing()
 116         * @var  array
 117         * @access       private
 118         */
 119         var $setfields = array();
 120
 121         /**
 122         * An array of all of the processed relations on an object
 123         * @var  array
 124         * @access       public
 125         */
 126         var $relations = array();
 127
 128         /**
 129         * WHERE condition
 130         * @var  string
 131         * @access       private
 132         */
 133         var $condition = '';
 134
 135         /**
 136         * The object table row; a fetched row that represents this instance
 137         * @var  array
 138         * @access       public
 139         */
 140         var $objdata = array();
 141
 142         /**
 143         * Insert ID from the insert() command
 144         * @var  integer
 145         * @access       public
 146         */
 147         var $insertid = 0;
 148
 149         /**
 150         * Pre- and post-action method stoppers
 151         * @var  array
 152         * @access       public
 153         */
 154         var $norunners = array();
 155
 156         /**
 157         * The relations to execute on
 158         * @var  array
 159         * @access       public
 160         */
 161         var $dorelations = array('fetch');
 162
 163         /**
 164         * Error list that has been generated
 165         * @var  array
 166         * @access       private
 167         */
 168         var $errors = array();
 169
 170         // ###################################################################
 171         /**
 172         * Constructor: cannot instantiate class directly
 173         */
 174         function __construct(&$registry)
 175         {
 176                 if (!is_subclass_of($this, 'API'))
 177                 {
 178                         trigger_error('Cannot instantiate the API module directly', E_USER_ERROR);
 179                 }
 180
 181                 if (!is_object($registry))
 182                 {
 183                         trigger_error('The passed registry is not an object', E_USER_ERROR);
 184                 }
 185
 186                 $this->registry =& $registry;
 187         }
 188
 189         // ###################################################################
 190         /**
 191         * (PHP 4) Constructor
 192         */
 193         function API(&$registry)
 194         {
 195                 $this->__construct($registry);
 196         }
 197
 198         // ###################################################################
 199         /**
 200         * Constructs an error for the error handler to receive
 201         *
 202         * @access       protected
 203         *
 204         * @param        string  Error message
 205         */
 206         function error($message)
 207         {
 208                 $this->errors[] = $message;
 209
 210                 // we want to explicitly specify silence
 211                 if (APIError() == 'silent')
 212                 {
 213                         return;
 214                 }
 215
 216                 if (!is_callable(APIError()))
 217                 {
 218                         trigger_error('No APIError() handler has been set', E_USER_WARNING);
 219                 }
 220
 221                 call_user_func(APIError(), $message);
 222         }
 223
 224         // ###################################################################
 225         /**
 226         * Returns the error list. This is because we don't want people mucking
 227         * with the error system. It will return an empty array if there are
 228         * no errors.
 229         *
 230         * @access       public
 231         *
 232         * @return       array   Array of errors
 233         */
 234         function check_errors()
 235         {
 236                 if (sizeof($this->errors) < 1)
 237                 {
 238                         return array();
 239                 }
 240
 241                 return $this->errors;
 242         }
 243
 244         // ###################################################################
 245         /**
 246         * Sets a value, sanitizes it, and verifies it
 247         *
 248         * @access       public
 249         *
 250         * @param        string  Field name
 251         * @param        mixed   Value
 252         * @param        bool    Do clean?
 253         * @param        bool    Do verify?
 254         */
 255         function set($field, $value, $doclean = true, $doverify = true)
 256         {
 257                 if (!isset($this->fields["$field"]))
 258                 {
 259                         trigger_error('Field `' . $field . '` is not valid', E_USER_WARNING);
 260                         return;
 261                 }
 262
 263                 $this->values["$field"] = ($doclean ? $this->registry->clean($value, $this->fields["$field"][F_TYPE]) : $value);
 264
 265                 $this->setfields["$field"] = $field;
 266
 267                 if (isset($this->fields["$field"][F_VERIFY]) AND $doverify)
 268                 {
 269                         if ($this->fields["$field"][F_VERIFY] == ':self')
 270                         {
 271                                 $verify = $this->{"verify_$field"}($field);
 272                         }
 273                         else
 274                         {
 275                                 $verify = $this->{$this->fields["$field"][F_VERIFY]}($field);
 276                         }
 277
 278                         if ($verify !== true)
 279                         {
 280                                 if ($verify === false)
 281                                 {
 282                                         $this->error(sprintf($this->registry->modules['localize']->string('Validation of %1$s failed'), $field));
 283                                 }
 284                                 else
 285                                 {
 286                                         $this->error($verify);
 287                                 }
 288                         }
 289                 }
 290         }
 291
 292         // ###################################################################
 293         /**
 294         * Sets the condition to use in the WHERE clause; if not passed, then
 295         * it calculates it from the REQ_AUTO field
 296         *
 297         * @access       public
 298         *
 299         * @param        string  WHERE conditional bit
 300         */
 301         function set_condition($condition = '')
 302         {
 303                 if ($condition != '')
 304                 {
 305                         $this->condition = $condition;
 306                 }
 307                 else
 308                 {
 309                         foreach ($this->fields AS $name => $options)
 310                         {
 311                                 if ($options[F_REQ] == REQ_AUTO)
 312                                 {
 313                                         if (!$this->values["$name"])
 314                                         {
 315                                                 trigger_error('Cannot determine condition from the REQ_AUTO field because it is not set', E_USER_WARNING);
 316                                                 continue;
 317                                         }
 318
 319                                         $this->condition = "$name = " . $this->prepare_field_for_sql($name);
 320                                 }
 321                         }
 322
 323                         if ($this->condition == '')
 324                         {
 325                                 trigger_error('No REQ_AUTO fields are present and therefore the condition cannot be created', E_USER_WARNING);
 326                         }
 327                 }
 328         }
 329
 330         // ###################################################################
 331         /**
 332         * Sets existing data into $values where it's not already present
 333         *
 334         * @access       public
 335         */
 336         function set_existing()
 337         {
 338                 static $run;
 339                 if ($run)
 340                 {
 341                         return;
 342                 }
 343
 344                 $this->fetch();
 345
 346                 foreach ($this->objdata AS $field => $value)
 347                 {
 348                         if (!isset($this->values["$field"]))
 349                         {
 350                                 $this->values["$field"] = $value;
 351                         }
 352                 }
 353
 354                 $run = true;
 355         }
 356
 357         // ###################################################################
 358         /**
 359         * Fetches a record based on the condition
 360         *
 361         * @access       public
 362         */
 363         function fetch()
 364         {
 365                 if ($this->condition == '')
 366                 {
 367                         trigger_error('Condition is empty: cannot fetch', E_USER_ERROR);
 368                 }
 369
 370                 $this->run_action_method('pre_fetch');
 371
 372                 $result = $this->registry->modules[ISSO_DB_LAYER]->query_first("SELECT * FROM {$this->prefix}{$this->table} WHERE {$this->condition}");
 373                 if (!$result)
 374                 {
 375                         $this->error($this->registry->modules['localize']->string('No records were returned'));
 376                         return;
 377                 }
 378
 379                 $this->run_action_method('post_fetch');
 380
 381                 $this->objdata = $result;
 382
 383                 foreach ($this->objdata AS $key => $value)
 384                 {
 385                         if (!isset($this->values["$key"]))
 386                         {
 387                                 $this->values["$key"] = $value;
 388                         }
 389                 }
 390
 391                 $this->call_relations('fetch');
 392         }
 393
 394         // ###################################################################
 395         /**
 396         * Inserts a record in the database
 397         *
 398         * @access       public
 399         */
 400         function insert()
 401         {
 402                 $this->verify();
 403
 404                 $this->run_action_method('pre_insert');
 405
 406                 foreach ($this->setfields AS $field)
 407                 {
 408                         $fields[] = $field;
 409                         $values[] = $this->prepare_field_for_sql($field);
 410                 }
 411
 412                 $this->registry->modules[ISSO_DB_LAYER]->query("INSERT INTO {$this->prefix}{$this->table} (" . implode(',', $fields) . ") VALUES (" . implode(',', $values) . ")");
 413
 414                 if (strcasecmp(ISSO_DB_LAYER, 'DB_PostgreSQL') == 0)
 415                 {
 416                         foreach ($this->fields AS $field => $info)
 417                         {
 418                                 if ($info[F_REQ] == REQ_AUTO)
 419                                 {
 420                                         $autofield = $field;
 421                                         break;
 422                                 }
 423                         }
 424
 425                         $this->insertid = $this->registry->modules[ISSO_DB_LAYER]->insert_id($this->prefix . $this->table, $autofield);
 426                 }
 427                 else
 428                 {
 429                         $this->insertid = $this->registry->modules[ISSO_DB_LAYER]->insert_id();
 430                 }
 431
 432                 $this->run_action_method('post_insert');
 433         }
 434
 435         // ###################################################################
 436         /**
 437         * Updates a record in the database using the data in $vaues
 438         *
 439         * @access       public
 440         */
 441         function update()
 442         {
 443                 if ($this->condition == '')
 444                 {
 445                         trigger_error('Condition is empty: cannot fetch', E_USER_ERROR);
 446                 }
 447
 448                 $this->run_action_method('pre_update');
 449
 450                 foreach ($this->setfields AS $field)
 451                 {
 452                         $updates[] = "$field = " . $this->prepare_field_for_sql($field);
 453                 }
 454                 $updates = implode(', ', $updates);
 455
 456                 $this->registry->modules[ISSO_DB_LAYER]->query("UPDATE {$this->prefix}{$this->table} SET $updates WHERE {$this->condition}");
 457
 458                 $this->run_action_method('post_update');
 459         }
 460
 461         // ###################################################################
 462         /**
 463         * Deletes a record
 464         *
 465         * @access       public
 466         */
 467         function delete()
 468         {
 469                 if ($this->condition == '')
 470                 {
 471                         trigger_error('Condition is empty: cannot fetch', E_USER_ERROR);
 472                 }
 473
 474                 $this->set_existing();
 475
 476                 $this->run_action_method('pre_delete');
 477
 478                 $this->registry->modules[ISSO_DB_LAYER]->query("DELETE FROM {$this->prefix}{$this->table} WHERE {$this->condition}");
 479
 480                 $this->run_action_method('post_delete');
 481         }
 482
 483         // ###################################################################
 484         /**
 485         * Verifies that all required fields are set
 486         *
 487         * @access       private
 488         */
 489         function verify()
 490         {
 491                 foreach ($this->fields AS $name => $options)
 492                 {
 493                         if ($options[F_REQ] == REQ_YES)
 494                         {
 495                                 if (!isset($this->values["$name"]))
 496                                 {
 497                                         $this->error(sprintf($this->registry->modules['localize']->string('Required field %1$s was not set'), $name));
 498                                 }
 499                         }
 500                         else if ($options[F_REQ] == REQ_SET)
 501                         {
 502                                 $this->{"set_$name"}();
 503                         }
 504                 }
 505         }
 506
 507         // ###################################################################
 508         /**
 509         * Runs a pre- or post-action method for database commands
 510         *
 511         * @access       private
 512         *
 513         * @param        string  Action to run
 514         */
 515         function run_action_method($method)
 516         {
 517                 if (in_array($method, $this->norunners))
 518                 {
 519                         return;
 520                 }
 521
 522                 $actmethod = (method_exists($this, $method) ? $this->$method() : '');
 523         }
 524
 525         // ###################################################################
 526         /**
 527         * Determines if it's safe to run a relation; if so, it will return
 528         * the WHERE SQL clause
 529         *
 530         * @access       public
 531         *
 532         * @param        string  Operation to run
 533         */
 534         function call_relations($method)
 535         {
 536                 if (!in_array($method, $this->dorelations))
 537                 {
 538                         return;
 539                 }
 540
 541                 foreach ($this->fields AS $field => $info)
 542                 {
 543                         $value = (isset($this->values["$field"]) ? $this->values["$field"] : $this->objdata["$field"]);
 544                         if ($value == null OR !is_array($info[F_RELATION]))
 545                         {
 546                                 continue;
 547                         }
 548
 549                         if (!file_exists($this->registry->get('apppath') . $info[F_RELATION][F_RELATION_FILE]))
 550                         {
 551                                 trigger_error("Could not load the relation file for field '$field'");
 552                         }
 553
 554                         require_once($this->registry->get('apppath') . $info[F_RELATION][F_RELATION_FILE]);
 555
 556                         $this->relations["$field"] = new $info[F_RELATION][F_RELATION_CLASS]($this->registry);
 557                         $this->relations["$field"]->set(($info[F_RELATION][F_RELATION_ALTFIELD] ? $info[F_RELATION][F_RELATION_ALTFIELD] : $field), $value);
 558                         $this->relations["$field"]->set_condition();
 559                         $this->relations["$field"]->$method();
 560                 }
 561         }
 562
 563         // ###################################################################
 564         /**
 565         * Prepares a value for use in a SQL query; it encases and escapes
 566         * strings and string-like values
 567         *
 568         * @access       private
 569         *
 570         * @param        string  Field name
 571         *
 572         * @return       string  Prepared value entry
 573         */
 574         function prepare_field_for_sql($name)
 575         {
 576                 $type = $this->fields["$name"][F_TYPE];
 577
 578                 if ($type == TYPE_NOCLEAN OR $type == TYPE_STR OR $type == TYPE_STRUN)
 579                 {
 580                         return "'" . $this->registry->escape($this->values["$name"]) . "'";
 581                 }
 582                 else if ($type == TYPE_BOOL)
 583                 {
 584                         return ($this->values["$name"] == true ? "'1'" : "'0'");
 585                 }
 586                 else
 587                 {
 588                         return $this->values["$name"];
 589                 }
 590         }
 591
 592         // ###################################################################
 593         /**
 594         * Verify field: not a zero value
 595         *
 596         * @access       protected
 597         */
 598         function verify_nozero($field)
 599         {
 600                 if ($this->values["$field"] == 0)
 601                 {
 602                         return false;
 603                 }
 604
 605                 return true;
 606         }
 607
 608         // ###################################################################
 609         /**
 610         * Verify field: not empty
 611         *
 612         * @access       protected
 613         */
 614         function verify_noempty($field)
 615         {
 616                 if (empty($this->values["$field"]))
 617                 {
 618                         return false;
 619                 }
 620
 621                 return true;
 622         }
 623 }
 624
 625 // ###################################################################
 626 /**
 627 * Setter and getter method for the API error reporting system. Passing
 628 * a name will cause the set, no arguments will cause the get.
 629 *
 630 * @access       public
 631 *
 632 * @param        mixed   Method name in callable form
 633 *
 634 * @return       mixed   Method name in callable form
 635 */
 636 function APIError($new = null)
 637 {
 638         static $caller, $prev;
 639
 640         if ($new === -1)
 641         {
 642                 $caller = $prev;
 643         }
 644         else if ($new !== null)
 645         {
 646                 $prev = $caller;
 647                 $caller = $new;
 648         }
 649
 650         return $caller;
 651 }
 652
 653 /*=====================================================================*\
 654 || ###################################################################
 655 || # $HeadURL$
 656 || # $Id$
 657 || ###################################################################
 658 \*=====================================================================*/
 659 ?>