framework/bootstrap/class_FrameworkBootstrap.php

   1 <?php
   2 // Own namespace
   3 namespace Org\Mxchange\CoreFramework\Bootstrap;
   4
   5 // Import framework stuff
   6 use Org\Mxchange\CoreFramework\Configuration\FrameworkConfiguration;
   7 use Org\Mxchange\CoreFramework\Connection\Database\DatabaseConnection;
   8 use Org\Mxchange\CoreFramework\Connector\Database\DatabaseConnector;
   9 use Org\Mxchange\CoreFramework\Console\Tools\ConsoleTools;
  10 use Org\Mxchange\CoreFramework\EntryPoint\ApplicationEntryPoint;
  11 use Org\Mxchange\CoreFramework\Factory\ObjectFactory;
  12 use Org\Mxchange\CoreFramework\Generic\NullPointerException;
  13 use Org\Mxchange\CoreFramework\Helper\Application\ApplicationHelper;
  14 use Org\Mxchange\CoreFramework\Loader\ClassLoader;
  15 use Org\Mxchange\CoreFramework\Manager\ManageableApplication;
  16 use Org\Mxchange\CoreFramework\Middleware\Debug\DebugMiddleware;
  17 use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;
  18 use Org\Mxchange\CoreFramework\Registry\GenericRegistry;
  19 use Org\Mxchange\CoreFramework\Request\Requestable;
  20 use Org\Mxchange\CoreFramework\Response\Responseable;
  21
  22 // Import SPL stuff
  23 use \BadMethodCallException;
  24 use \InvalidArgumentException;
  25 use \SplFileInfo;
  26
  27 /**
  28  * A framework-bootstrap class which helps the frameworks to bootstrap ... ;-)
  29  *
  30  * @author              Roland Haeder <webmaster@ship-simu.org>
  31  * @version             0.0.0
  32  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2017 Core Developer Team
  33  * @license             GNU GPL 3.0 or any newer version
  34  * @link                http://www.ship-simu.org
  35  *
  36  * This program is free software: you can redistribute it and/or modify
  37  * it under the terms of the GNU General Public License as published by
  38  * the Free Software Foundation, either version 3 of the License, or
  39  * (at your option) any later version.
  40  *
  41  * This program is distributed in the hope that it will be useful,
  42  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  43  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  44  * GNU General Public License for more details.
  45  *
  46  * You should have received a copy of the GNU General Public License
  47  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  48  */
  49 final class FrameworkBootstrap {
  50
  51         /**
  52          * Detected server address
  53          */
  54         private static $serverAddress = NULL;
  55
  56         /**
  57          * Instance of a Requestable class
  58          */
  59         private static $requestInstance = NULL;
  60
  61         /**
  62          * Instance of a Responseable class
  63          */
  64         private static $responseInstance = NULL;
  65
  66         /**
  67          * Instance of a FrameworkConfiguration class
  68          */
  69         private static $configurationInstance = NULL;
  70
  71         /**
  72          * Database instance
  73          */
  74         private static $databaseInstance = NULL;
  75
  76         /*
  77          * Includes applications may have. They will be tried in the given order,
  78          * some will become soon deprecated.
  79          */
  80         private static $configAppIncludes = array(
  81                 // The ApplicationHelper class (required)
  82                 'class_ApplicationHelper' => 'required',
  83                 // Some debugging stuff (optional but can be committed)
  84                 'debug'                   => 'optional',
  85                 // Application's exception handler (optional but can be committed)
  86                 'exceptions'              => 'optional',
  87                 // Application's configuration file (committed, non-local specific)
  88                 'config'                  => 'required',
  89                 // Local configuration file (optional, not committed, listed in .gitignore)
  90                 'config-local'            => 'optional',
  91                 // Application data (deprecated)
  92                 'data'                    => 'deprecated',
  93                 // Application loader (deprecated)
  94                 'loader'                  => 'deprecated',
  95                 // Application initializer (deprecated)
  96                 'init'                    => 'deprecated',
  97                 // Application starter (deprecated)
  98                 'starter'                 => 'deprecated',
  99         );
 100
 101         /**
 102          * Private constructor, no instance is needed from this class as only
 103          * static methods exist.
 104          */
 105         private function __construct () {
 106                 // Prevent making instances from this "utilities" class
 107         }
 108
 109         /**
 110          * Some "getter" for a configuration instance, making sure, it is unique
 111          *
 112          * @return      $configurationInstance  An instance of a FrameworkConfiguration class
 113          */
 114         public static function getConfigurationInstance () {
 115                 // Is the instance there?
 116                 if (is_null(self::$configurationInstance)) {
 117                         // Init new instance
 118                         self::$configurationInstance = new FrameworkConfiguration();
 119                 } // END - if
 120
 121                 // Return it
 122                 return self::$configurationInstance;
 123         }
 124
 125         /**
 126          * "Getter" to get response/request type from analysis of the system.
 127          *
 128          * @return      $requestType    Analyzed request type
 129          */
 130         public static function getRequestTypeFromSystem () {
 131                 // Default is console
 132                 $requestType = 'console';
 133
 134                 // Is 'HTTP_HOST' set?
 135                 if (isset($_SERVER['HTTP_HOST'])) {
 136                         // Then it is a HTML response/request.
 137                         $requestType = 'html';
 138                 } // END - if
 139
 140                 // Return it
 141                 return $requestType;
 142         }
 143
 144         /**
 145          * Checks whether the given file/path is in open_basedir(). This does not
 146          * gurantee that the file is actually readable and/or writeable. If you need
 147          * such gurantee then please use isReadableFile() instead.
 148          *
 149          * @param       $fileInstance   An instance of a SplFileInfo class
 150          * @return      $isReachable    Whether it is within open_basedir()
 151          */
 152         public static function isReachableFilePath (SplFileInfo $fileInstance) {
 153                 // Is not reachable by default
 154                 $isReachable = false;
 155
 156                 // Get open_basedir parameter
 157                 $openBaseDir = trim(ini_get('open_basedir'));
 158
 159                 // Is it set?
 160                 if (!empty($openBaseDir)) {
 161                         // Check all entries
 162                         foreach (explode(PATH_SEPARATOR, $openBaseDir) as $dir) {
 163                                 // Check on existence
 164                                 if (substr($fileInstance->getPathname(), 0, strlen($dir)) == $dir) {
 165                                         // Is reachable
 166                                         $isReachable = true;
 167
 168                                         // Abort lookup as it has been found in open_basedir
 169                                         break;
 170                                 } // END - if
 171                         } // END - foreach
 172                 } else {
 173                         // If open_basedir is not set, all is allowed
 174                         $isReachable = true;
 175                 }
 176
 177                 // Return status
 178                 return $isReachable;
 179         }
 180
 181         /**
 182          * Checks whether the give file is within open_basedir() (done by
 183          * isReachableFilePath()), is actually a file and is readable.
 184          *
 185          * @param       $fileInstance   An instance of a SplFileInfo class
 186          * @return      $isReadable             Whether the file is readable (and therefor exists)
 187          */
 188         public static function isReadableFile (SplFileInfo $fileInstance) {
 189                 // Default is not readable
 190                 $isReadable = false;
 191
 192                 // Check if it is a file and readable
 193                 $isReadable = (
 194                         (
 195                                 self::isReachableFilePath($fileInstance)
 196                         ) && (
 197                                 $fileInstance->isFile()
 198                         ) && (
 199                                 $fileInstance->isReadable()
 200                         )
 201                 );
 202
 203                 // Return status
 204                 return $isReadable;
 205         }
 206
 207         /**
 208          * Loads given include file
 209          *
 210          * @param       $fileInstance   An instance of a SplFileInfo class
 211          * @return      void
 212          * @throws      InvalidArgumentException        If file was not found or not readable or deprecated
 213          */
 214         public static function loadInclude (SplFileInfo $fileInstance) {
 215                 // Trace message
 216                 //* NOISY-DEBUG: */ printf('[%s:%d]: fileInstance=%s - CALLED!' . PHP_EOL, __METHOD__, __LINE__, $fileInstance);
 217
 218                 // Should be there ...
 219                 if (!self::isReadableFile($fileInstance)) {
 220                         // Abort here
 221                         throw new InvalidArgumentException(sprintf('Cannot find fileInstance.pathname=%s.', $fileInstance->getPathname()));
 222                 } // END - if
 223
 224                 // Load it
 225                 require_once $fileInstance->getPathname();
 226
 227                 // Trace message
 228                 //* NOISY-DEBUG: */ printf('[%s:%d]: EXIT!' . PHP_EOL, __METHOD__, __LINE__);
 229         }
 230
 231         /**
 232          * Does the actual bootstrap
 233          *
 234          * @return      void
 235          */
 236         public static function doBootstrap () {
 237                 // Load basic include files to continue bootstrapping
 238                 self::loadInclude(new SplFileInfo(sprintf('%smain%sinterfaces%sclass_FrameworkInterface.php', ApplicationEntryPoint::detectFrameworkPath(), DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR)));
 239                 self::loadInclude(new SplFileInfo(sprintf('%smain%sclasses%sclass_BaseFrameworkSystem.php', ApplicationEntryPoint::detectFrameworkPath(), DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR)));
 240                 self::loadInclude(new SplFileInfo(sprintf('%smain%sinterfaces%sregistry%sclass_Registerable.php', ApplicationEntryPoint::detectFrameworkPath(), DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR, DIRECTORY_SEPARATOR)));
 241                 self::loadInclude(new SplFileInfo(sprintf('%sconfig%sclass_FrameworkConfiguration.php', ApplicationEntryPoint::detectFrameworkPath(), DIRECTORY_SEPARATOR)));
 242
 243                 // Load global configuration
 244                 self::loadInclude(new SplFileInfo(sprintf('%s%s', ApplicationEntryPoint::detectFrameworkPath(), 'config-global.php')));
 245         }
 246
 247         /**
 248          * Initializes the framework by scanning for all framework-relevant
 249          * classes, interfaces and exception. Then determine the request type and
 250          * initialize a Requestable instance which will then contain all request
 251          * parameter, also from CLI. Next step is to validate the application
 252          * (very basic).
 253          *
 254          * @return      void
 255          */
 256         public static function initFramework () {
 257                 /**
 258                  * 1) Load class loader and scan framework classes, interfaces and
 259                  *    exceptions.
 260                  */
 261                 self::scanFrameworkClasses();
 262
 263                 /*
 264                  * 2) Determine the request type, console or web and store request and
 265                  *    response here. This also initializes the request instance will
 266                  *    all given parameters (see doc-tag for possible sources of
 267                  *    parameters).
 268                  */
 269                 self::determineRequestType();
 270
 271                 /*
 272                  * 3) Now, that there are all request parameters being available, check
 273                  *    if 'application' is supplied. If it is not found, abort execution, if
 274                  *    found, continue below with next step.
 275                  */
 276                 self::validateApplicationParameter();
 277         }
 278
 279         /**
 280          * Initializes the detected application. This may fail if required files
 281          * are not found in the application's base path (not to be confused with
 282          * 'application_base_path' which only points to /some/foo/application/.
 283          *
 284          * @return      void
 285          */
 286         public static function prepareApplication () {
 287                 // Configuration entry 'detected_app_name' must be set, get it here, including full path
 288                 $application = self::getConfigurationInstance()->getConfigEntry('detected_app_name');
 289                 $fullPath    = self::getConfigurationInstance()->getConfigEntry('detected_full_app_path');
 290
 291                 /*
 292                  * Now check and load all files, found deprecated files will throw a
 293                  * warning at the user.
 294                  */
 295                 foreach (self::$configAppIncludes as $fileName => $status) {
 296                         // Construct file instance
 297                         $fileInstance = new SplFileInfo(sprintf('%s%s.php', $fullPath, $fileName));
 298
 299                         // Determine if this file is wanted/readable/deprecated
 300                         if (($status == 'required') && (!self::isReadableFile($fileInstance))) {
 301                                 // Nope, required file cannot be found/read from
 302                                 ApplicationEntryPoint::exitApplication(sprintf('Application "%s" does not have required file "%s.php". Please add it.', $application, $fileInstance->getBasename()));
 303                         } elseif (($fileInstance->isFile()) && (!$fileInstance->isReadable())) {
 304                                 // Found, not readable file
 305                                 ApplicationEntryPoint::exitApplication(sprintf('File "%s.php" from application "%s" cannot be read. Please fix CHMOD.', $fileInstance->getBasename(), $application));
 306                         } elseif (($status != 'required') && (!self::isReadableFile($fileInstance))) {
 307                                 // Not found but optional/deprecated file, skip it
 308                                 continue;
 309                         }
 310
 311                         // Is the file deprecated?
 312                         if ($status == 'deprecated') {
 313                                 // Issue warning
 314                                 trigger_error(sprintf('Deprecated file "%s.php" found, will not load it to avoid problems. Please remove it from your application "%s" to avoid this warning.', $fileName, $application), E_USER_WARNING);
 315
 316                                 // Skip loading deprecated file
 317                                 continue;
 318                         } // END - if
 319
 320                         // Load it
 321                         self::loadInclude($fileInstance);
 322                 } // END - foreach
 323
 324                 // Scan for application's classes, exceptions and interfaces
 325                 ClassLoader::scanApplicationClasses();
 326         }
 327
 328         /**
 329          * Starts a fully initialized application, the class ApplicationHelper must
 330          * be loaded at this point.
 331          *
 332          * @return      void
 333          */
 334         public static function startApplication () {
 335                 // Configuration entry 'detected_app_name' must be set, get it here
 336                 $application = self::getConfigurationInstance()->getConfigEntry('detected_app_name');
 337
 338                 // Is there an application helper instance?
 339                 $applicationInstance = call_user_func_array(
 340                         array(
 341                                 'Org\Mxchange\CoreFramework\Helper\Application\ApplicationHelper', 'getSelfInstance'
 342                         ), array()
 343                 );
 344
 345                 // Some sanity checks
 346                 if ((empty($applicationInstance)) || (is_null($applicationInstance))) {
 347                         // Something went wrong!
 348                         ApplicationEntryPoint::exitApplication(sprintf('[Main:] The application <span class="app_name">%s</span> could not be launched because the helper class <span class="class_name">%s</span> is not loaded.',
 349                                 $application,
 350                                 'Org\Mxchange\CoreFramework\Helper\Application\ApplicationHelper'
 351                         ));
 352                 } elseif (!is_object($applicationInstance)) {
 353                         // No object!
 354                         ApplicationEntryPoint::exitApplication(sprintf('[Main:] The application <span class="app_name">%s</span> could not be launched because &#39;app&#39; is not an object (%s).',
 355                                 $application,
 356                                 gettype($applicationInstance)
 357                         ));
 358                 } elseif (!($applicationInstance instanceof ManageableApplication)) {
 359                         // Missing interface
 360                         ApplicationEntryPoint::exitApplication(sprintf('[Main:] The application <span class="app_name">%s</span> could not be launched because &#39;app&#39; is lacking required interface ManageableApplication.',
 361                                 $application
 362                         ));
 363                 }
 364
 365                 // Now call all methods in one go
 366                 foreach (array('setupApplicationData', 'initApplication', 'launchApplication') as $methodName) {
 367                         // Debug message
 368                         //*NOISY-DEBUG: */ printf('[%s:%d]: Calling methodName=%s ...' . PHP_EOL, __METHOD__, __LINE__, $methodName);
 369
 370                         // Call method
 371                         call_user_func(array($applicationInstance, $methodName));
 372                 } // END - foreach
 373         }
 374
 375         /**
 376          * Initializes database instance, no need to double-call this method
 377          *
 378          * @return      void
 379          */
 380         public static function initDatabaseInstance () {
 381                 // Get application instance
 382                 $applicationInstance = ApplicationHelper::getSelfInstance();
 383
 384                 // Is the database instance already set?
 385                 if (self::getDatabaseInstance() instanceof DatabaseConnector) {
 386                         // Yes, then abort here
 387                         throw new BadMethodCallException('Method called twice.');
 388                 } // END - if
 389
 390                 // Initialize database layer
 391                 $databaseInstance = ObjectFactory::createObjectByConfiguredName(self::getConfigurationInstance()->getConfigEntry('database_type') . '_class');
 392
 393                 // Prepare database instance
 394                 $connectionInstance = DatabaseConnection::createDatabaseConnection(DebugMiddleware::getSelfInstance(), $databaseInstance);
 395
 396                 // Set it in application helper
 397                 self::setDatabaseInstance($connectionInstance);
 398         }
 399
 400         /**
 401          * Detects the server address (SERVER_ADDR) and set it in configuration
 402          *
 403          * @return      $serverAddress  The detected server address
 404          * @throws      UnknownHostnameException        If SERVER_NAME cannot be resolved to an IP address
 405          * @todo        Have to check some more entries from $_SERVER here
 406          */
 407         public static function detectServerAddress () {
 408                 // Is the entry set?
 409                 if (!isset(self::$serverAddress)) {
 410                         // Is it set in $_SERVER?
 411                         if (!empty($_SERVER['SERVER_ADDR'])) {
 412                                 // Set it from $_SERVER
 413                                 self::$serverAddress = $_SERVER['SERVER_ADDR'];
 414                         } elseif (isset($_SERVER['SERVER_NAME'])) {
 415                                 // Resolve IP address
 416                                 $serverIp = ConsoleTools::resolveIpAddress($_SERVER['SERVER_NAME']);
 417
 418                                 // Is it valid?
 419                                 if ($serverIp === false) {
 420                                         /*
 421                                          * Why is gethostbyname() returning the host name and not
 422                                          * false as many other PHP functions are doing? ;-(
 423                                          */
 424                                         throw new UnknownHostnameException(sprintf('Cannot resolve "%s" to an IP address. Please fix your setup.', $_SERVER['SERVER_NAME']));
 425                                 } // END - if
 426
 427                                 // Al fine, set it
 428                                 self::$serverAddress = $serverIp;
 429                         } else {
 430                                 // Run auto-detecting through console tools lib
 431                                 self::$serverAddress = ConsoleTools::acquireSelfIpAddress();
 432                         }
 433                 } // END - if
 434
 435                 // Return it
 436                 return self::$serverAddress;
 437         }
 438
 439         /**
 440          * Setter for default time zone (must be correct!)
 441          *
 442          * @param       $timezone       The timezone string (e.g. Europe/Berlin)
 443          * @return      $success        If timezone was accepted
 444          * @throws      NullPointerException    If $timezone is NULL
 445          * @throws      InvalidArgumentException        If $timezone is empty
 446          */
 447         public static function setDefaultTimezone ($timezone) {
 448                 // Is it null?
 449                 if (is_null($timezone)) {
 450                         // Throw NPE
 451                         throw new NullPointerException(NULL, BaseFrameworkSystem::EXCEPTION_IS_NULL_POINTER);
 452                 } elseif (!is_string($timezone)) {
 453                         // Is not a string
 454                         throw new InvalidArgumentException(sprintf('timezone[]=%s is not a string', gettype($timezone)));
 455                 } elseif ((is_string($timezone)) && (empty($timezone))) {
 456                         // Entry is empty
 457                         throw new InvalidArgumentException('timezone is empty');
 458                 }
 459
 460                 // Default success
 461                 $success = FALSE;
 462
 463                 /*
 464                  * Set desired time zone to prevent date() and related functions to
 465                  * issue an E_WARNING.
 466                  */
 467                 $success = date_default_timezone_set($timezone);
 468
 469                 // Return status
 470                 return $success;
 471         }
 472
 473         /**
 474          * Checks whether HTTPS is set in $_SERVER
 475          *
 476          * @return      $isset  Whether HTTPS is set
 477          * @todo        Test more fields
 478          */
 479         public static function isHttpSecured () {
 480                 return (
 481                         (
 482                                 (
 483                                         isset($_SERVER['HTTPS'])
 484                                 ) && (
 485                                         strtolower($_SERVER['HTTPS']) == 'on'
 486                                 )
 487                         ) || (
 488                                 (
 489                                         isset($_SERVER['HTTP_X_FORWARDED_PROTO'])
 490                                 ) && (
 491                                         strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https'
 492                                 )
 493                         )
 494                 );
 495         }
 496
 497         /**
 498          * Dectect and return the base URL for all URLs and forms
 499          *
 500          * @return      $baseUrl        Detected base URL
 501          */
 502         public static function detectBaseUrl () {
 503                 // Initialize the URL
 504                 $protocol = 'http';
 505
 506                 // Do we have HTTPS?
 507                 if (self::isHttpSecured()) {
 508                         // Add the >s< for HTTPS
 509                         $protocol = 'https';
 510                 } // END - if
 511
 512                 // Construct the full URL and secure it against CSRF attacks
 513                 $baseUrl = sprintf('%s://%s%s', $protocol, self::detectDomain(), self::detectScriptPath());
 514
 515                 // Return the URL
 516                 return $baseUrl;
 517         }
 518
 519         /**
 520          * Detect safely and return the full domain where this script is installed
 521          *
 522          * @return      $fullDomain             The detected full domain
 523          */
 524         public static function detectDomain () {
 525                 // Full domain is localnet.invalid by default
 526                 $fullDomain = 'localnet.invalid';
 527
 528                 // Is the server name there?
 529                 if (isset($_SERVER['SERVER_NAME'])) {
 530                         // Detect the full domain
 531                         $fullDomain = htmlentities(strip_tags($_SERVER['SERVER_NAME']), ENT_QUOTES);
 532                 } // END - if
 533
 534                 // Return it
 535                 return $fullDomain;
 536         }
 537
 538         /**
 539          * Detect safely the script path without trailing slash which is the glue
 540          * between "http://your-domain.invalid/" and "script-name.php"
 541          *
 542          * @return      $scriptPath             The script path extracted from $_SERVER['SCRIPT_NAME']
 543          */
 544         public static function detectScriptPath () {
 545                 // Default is empty
 546                 $scriptPath = '';
 547
 548                 // Is the scriptname set?
 549                 if (isset($_SERVER['SCRIPT_NAME'])) {
 550                         // Get dirname from it and replace back-slashes with slashes for lame OSes...
 551                         $scriptPath = str_replace("\\", '/', dirname($_SERVER['SCRIPT_NAME']));
 552                 } // END - if
 553
 554                 // Return it
 555                 return $scriptPath;
 556         }
 557
 558         /**
 559          * 1) Loads class scanner and scans all framework's classes and interfaces.
 560          * This method also registers the class loader's method autoLoad() for the
 561          * SPL auto-load feature. Remember that you can register additional methods
 562          * (not functions, please) for other libraries.
 563          *
 564          * Yes, I know about Composer, but I like to keep my class loader around.
 565          * You can always use mine as long as your classes have a namespace
 566          * according naming-convention: Vendor\Project\Group[\SubGroup]
 567          *
 568          * @return      void
 569          */
 570         private static function scanFrameworkClasses () {
 571                 // Include the class loader function
 572                 require self::getConfigurationInstance()->getConfigEntry('framework_base_path') . 'loader/class_ClassLoader.php';
 573
 574                 // Register auto-load function with the SPL
 575                 spl_autoload_register('Org\Mxchange\CoreFramework\Loader\ClassLoader::autoLoad');
 576
 577                 // Scan for all framework classes, exceptions and interfaces
 578                 ClassLoader::scanFrameworkClasses();
 579         }
 580
 581         /**
 582          * 2) Determines request/response type and stores the created
 583          * request/response instances in this object for later usage.
 584          *
 585          * @return      void
 586          */
 587         private static function determineRequestType () {
 588                 // Determine request type
 589                 $request = self::getRequestTypeFromSystem();
 590                 $requestType = self::getRequestTypeFromSystem();
 591
 592                 // Create a new request object
 593                 $requestInstance = ObjectFactory::createObjectByName(sprintf('Org\Mxchange\CoreFramework\Request\%sRequest', BaseFrameworkSystem::convertToClassName($request)));
 594
 595                 // Remember request instance here
 596                 self::setRequestInstance($requestInstance);
 597
 598                 // Do we have another response?
 599                 if ($requestInstance->isRequestElementSet('request')) {
 600                         // Then use it
 601                         $request = strtolower($requestInstance->getRequestElement('request'));
 602                         $requestType = $request;
 603                 } // END - if
 604
 605                 // ... and a new response object
 606                 $responseClass = sprintf('Org\Mxchange\CoreFramework\Response\%sResponse', BaseFrameworkSystem::convertToClassName($request));
 607                 $responseInstance = ObjectFactory::createObjectByName($responseClass);
 608
 609                 // Remember response instance here
 610                 self::setResponseInstance($responseInstance);
 611         }
 612
 613         /**
 614          * 3) Validate parameter 'application' if it is set and the application is there.
 615          *
 616          * @return      void
 617          */
 618         private static function validateApplicationParameter () {
 619                 // Is the parameter set?
 620                 if (!self::getRequestInstance()->isRequestElementSet('app')) {
 621                         /*
 622                          * Don't continue here, the application 'selector' is no longer
 623                          * supported and only existed as an idea to select the proper
 624                          * application (by user).
 625                          */
 626                         ApplicationEntryPoint::exitApplication('No application specified. Please provide a parameter "app" and retry.');
 627                 } // END - if
 628
 629                 // Get it for local usage
 630                 $application = self::getRequestInstance()->getRequestElement('app');
 631
 632                 // Secure it, by keeping out tags
 633                 $application = htmlentities(strip_tags($application), ENT_QUOTES);
 634
 635                 // Secure it a little more with a reg.exp.
 636                 $application = preg_replace('/([^a-z0-9_-])+/i', '', $application);
 637
 638                 // Construct FQPN (Full-Qualified Path Name) for ApplicationHelper class
 639                 $applicationPath = sprintf(
 640                         '%s%s%s',
 641                         self::getConfigurationInstance()->getConfigEntry('application_base_path'),
 642                         $application,
 643                         DIRECTORY_SEPARATOR
 644                 );
 645
 646                 // Full path for application
 647                 // Is the path there? This secures a bit the parameter (from untrusted source).
 648                 if ((!is_dir($applicationPath)) || (!is_readable($applicationPath))) {
 649                         // Not found or not readable
 650                         ApplicationEntryPoint::exitApplication(sprintf('Application "%s" not found.', $application));
 651                 } // END - if
 652
 653                 // Set the detected application's name and full path for later usage
 654                 self::getConfigurationInstance()->setConfigEntry('detected_full_app_path', $applicationPath);
 655                 self::getConfigurationInstance()->setConfigEntry('detected_app_name'     , $application);
 656         }
 657
 658         /**
 659          * Getter for request instance
 660          *
 661          * @return      $requestInstance        An instance of a Requestable class
 662          */
 663         public static function getRequestInstance () {
 664                 return self::$requestInstance;
 665         }
 666
 667         /**
 668          * Getter for response instance
 669          *
 670          * @return      $responseInstance       An instance of a Responseable class
 671          */
 672         public static function getResponseInstance () {
 673                 return self::$responseInstance;
 674         }
 675
 676         /**
 677          * Setter for request instance
 678          *
 679          * @param       $requestInstance        An instance of a Requestable class
 680          * @return      void
 681          */
 682         private static function setRequestInstance (Requestable $requestInstance) {
 683                 self::$requestInstance = $requestInstance;
 684         }
 685
 686         /**
 687          * Setter for response instance
 688          *
 689          * @param       $responseInstance       An instance of a Responseable class
 690          * @return      void
 691          */
 692         private static function setResponseInstance (Responseable $responseInstance) {
 693                 self::$responseInstance = $responseInstance;
 694         }
 695
 696         /**
 697          * Setter for database instance
 698          *
 699          * @param       $databaseInstance       An instance of a DatabaseConnection class
 700          * @return      void
 701          */
 702         public static function setDatabaseInstance (DatabaseConnection $databaseInstance) {
 703                 self::$databaseInstance = $databaseInstance;
 704         }
 705
 706         /**
 707          * Getter for database instance
 708          *
 709          * @return      $databaseInstance       An instance of a DatabaseConnection class
 710          */
 711         public static function getDatabaseInstance () {
 712                 // Return instance
 713                 return self::$databaseInstance;
 714         }
 715
 716 }