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<?php
/**
* Base controller class.
* Controllers are the cornerstone of all site functionality in SilverStripe. The {@link Director}
* selects a controller to pass control to, and then calls {@link run()}. This method will execute
* the appropriate action - either by calling the action method, or displaying the action's template.
*
* See {@link getTemplate()} for information on how the template is chosen.
* @package framework
* @subpackage control
*/
class Controller extends RequestHandler implements TemplateGlobalProvider {
/**
* @var array $urlParams An array of arguments extracted from the URL
*/
protected $urlParams;
/**
* @var array $requestParams Contains all GET and POST parameters
* passed to the current {@link SS_HTTPRequest}.
* @uses SS_HTTPRequest->requestVars()
*/
protected $requestParams;
/**
* @var string $action The URL part matched on the current controller as
* determined by the "$Action" part of the {@link $url_handlers} definition.
* Should correlate to a public method on this controller.
* Used in {@link render()} and {@link getViewer()} to determine
* action-specific templates.
*/
protected $action;
/**
* The {@link Session} object for this controller
*/
protected $session;
/**
* Stack of current controllers.
* Controller::$controller_stack[0] is the current controller.
*/
protected static $controller_stack = array();
protected $basicAuthEnabled = true;
/**
* @var SS_HTTPResponse $response The response object that the controller returns.
* Set in {@link handleRequest()}.
*/
protected $response;
/**
* Default URL handlers - (Action)/(ID)/(OtherID)
*/
static $url_handlers = array(
'$Action//$ID/$OtherID' => 'handleAction',
);
static $allowed_actions = array(
'handleAction',
'handleIndex',
);
/**
* Initialisation function that is run before any action on the controller is called.
*
* @uses BasicAuth::requireLogin()
*/
public function init() {
if($this->basicAuthEnabled) BasicAuth::protect_site_if_necessary();
// Directly access the session variable just in case the Group or Member tables don't yet exist
if(Session::get('loggedInAs') && Security::database_is_ready()) {
$member = Member::currentUser();
if($member) {
if(!headers_sent()) Cookie::set("PastMember", true, 90, null, null, false, true);
DB::query("UPDATE \"Member\" SET \"LastVisited\" = " . DB::getConn()->now()
. " WHERE \"ID\" = $member->ID", null);
}
}
// This is used to test that subordinate controllers are actually calling parent::init() - a common bug
$this->baseInitCalled = true;
}
/**
* Returns a link to this controller. Overload with your own Link rules if they exist.
*/
public function Link() {
return get_class($this) .'/';
}
/**
* Executes this controller, and return an {@link SS_HTTPResponse} object with the result.
*
* This method first does a few set-up activities:
* - Push this controller ont to the controller stack -
* see {@link Controller::curr()} for information about this.
* - Call {@link init()}
* - Defer to {@link RequestHandler->handleRequest()} to determine which action
* should be executed
*
* Note: $requestParams['executeForm'] support was removed,
* make the following change in your URLs:
* "/?executeForm=FooBar" -> "/FooBar"
* Also make sure "FooBar" is in the $allowed_actions of your controller class.
*
* Note: You should rarely need to overload run() -
* this kind of change is only really appropriate for things like nested
* controllers - {@link ModelAsController} and {@link RootURLController}
* are two examples here. If you want to make more
* orthodox functionality, it's better to overload {@link init()} or {@link index()}.
*
* Important: If you are going to overload handleRequest,
* make sure that you start the method with $this->pushCurrent()
* and end the method with $this->popCurrent().
* Failure to do this will create weird session errors.
*
* @param $request The {@link SS_HTTPRequest} object that is responsible
* for distributing request parsing.
* @return SS_HTTPResponse The response that this controller produces,
* including HTTP headers such as redirection info
*/
public function handleRequest(SS_HTTPRequest $request, DataModel $model) {
if(!$request) user_error("Controller::handleRequest() not passed a request!", E_USER_ERROR);
$this->pushCurrent();
$this->urlParams = $request->allParams();
$this->request = $request;
$this->response = new SS_HTTPResponse();
$this->setDataModel($model);
$this->extend('onBeforeInit');
// Init
$this->baseInitCalled = false;
$this->init();
if(!$this->baseInitCalled) {
user_error("init() method on class '$this->class' doesn't call Controller::init()."
. "Make sure that you have parent::init() included.", E_USER_WARNING);
}
$this->extend('onAfterInit');
// If we had a redirection or something, halt processing.
if($this->response->isFinished()) {
$this->popCurrent();
return $this->response;
}
$body = parent::handleRequest($request, $model);
if($body instanceof SS_HTTPResponse) {
if(isset($_REQUEST['debug_request'])) {
Debug::message("Request handler returned SS_HTTPResponse object to $this->class controller;"
. "returning it without modification.");
}
$this->response = $body;
} else {
if($body instanceof Object && $body->hasMethod('getViewer')) {
if(isset($_REQUEST['debug_request'])) {
Debug::message("Request handler $body->class object to $this->class controller;"
. "rendering with template returned by $body->class::getViewer()");
}
$body = $body->getViewer($request->latestParam('Action'))->process($body);
}
$this->response->setBody($body);
}
ContentNegotiator::process($this->response);
HTTP::add_cache_headers($this->response);
$this->popCurrent();
return $this->response;
}
/**
* Controller's default action handler. It will call the method named in $Action, if that method exists.
* If $Action isn't given, it will use "index" as a default.
*/
public function handleAction($request, $action) {
foreach($request->latestParams() as $k => $v) {
if($v || !isset($this->urlParams[$k])) $this->urlParams[$k] = $v;
}
$this->action = $action;
$this->requestParams = $request->requestVars();
if($this->hasMethod($action)) {
$result = parent::handleAction($request, $action);
// If the action returns an array, customise with it before rendering the template.
if(is_array($result)) {
return $this->getViewer($action)->process($this->customise($result));
} else {
return $result;
}
} else {
return $this->getViewer($action)->process($this);
}
}
public function setURLParams($urlParams) {
$this->urlParams = $urlParams;
}
/**
* @return array The parameters extracted from the URL by the {@link Director}.
*/
public function getURLParams() {
return $this->urlParams;
}
/**
* Returns the SS_HTTPResponse object that this controller is building up.
* Can be used to set the status code and headers
*/
public function getResponse() {
return $this->response;
}
protected $baseInitCalled = false;
/**
* Return the object that is going to own a form that's being processed, and handle its execution.
* Note that the result needn't be an actual controller object.
*/
public function getFormOwner() {
// Get the appropraite ocntroller: sometimes we want to get a form from another controller
if(isset($this->requestParams['formController'])) {
$formController = Director::getControllerForURL($this->requestParams['formController']);
while(is_a($formController, 'NestedController')) {
$formController = $formController->getNestedController();
}
return $formController;
} else {
return $this;
}
}
/**
* This is the default action handler used if a method doesn't exist.
* It will process the controller object with the template returned by {@link getViewer()}
*/
public function defaultAction($action) {
return $this->getViewer($action)->process($this);
}
/**
* Returns the action that is being executed on this controller.
*/
public function getAction() {
return $this->action;
}
/**
* Return an SSViewer object to process the data
* @return SSViewer The viewer identified being the default handler for this Controller/Action combination
*/
public function getViewer($action) {
// Hard-coded templates
if($this->templates[$action]) {
$templates = $this->templates[$action];
} else if($this->templates['index']) {
$templates = $this->templates['index'];
} else if($this->template) {
$templates = $this->template;
} else {
// Add action-specific templates for inheritance chain
$templates = array();
$parentClass = $this->class;
if($action && $action != 'index') {
$parentClass = $this->class;
while($parentClass != "Controller") {
$templates[] = strtok($parentClass,'_') . '_' . $action;
$parentClass = get_parent_class($parentClass);
}
}
// Add controller templates for inheritance chain
$parentClass = $this->class;
while($parentClass != "Controller") {
$templates[] = strtok($parentClass,'_');
$parentClass = get_parent_class($parentClass);
}
$templates[] = 'Controller';
// remove duplicates
$templates = array_unique($templates);
}
return new SSViewer($templates);
}
public function hasAction($action) {
return parent::hasAction($action) || $this->hasActionTemplate($action);
}
/**
* Removes all the "action" part of the current URL and returns the result.
* If no action parameter is present, returns the full URL
* @static
* @return String
*/
public function removeAction($fullURL, $action = null) {
if (!$action) $action = $this->getAction(); //default to current action
$returnURL = $fullURL;
if (($pos = strpos($fullURL, $action)) !== false) {
$returnURL = substr($fullURL,0,$pos);
}
return $returnURL;
}
/**
* Returns TRUE if this controller has a template that is specifically designed to handle a specific action.
*
* @param string $action
* @return bool
*/
public function hasActionTemplate($action) {
if(isset($this->templates[$action])) return true;
$parentClass = $this->class;
$templates = array();
while($parentClass != 'Controller') {
$templates[] = strtok($parentClass, '_') . '_' . $action;
$parentClass = get_parent_class($parentClass);
}
return SSViewer::hasTemplate($templates);
}
/**
* Render the current controller with the templates determined
* by {@link getViewer()}.
*
* @param array $params Key-value array for custom template variables (Optional)
* @return string Parsed template content
*/
public function render($params = null) {
$template = $this->getViewer($this->getAction());
// if the object is already customised (e.g. through Controller->run()), use it
$obj = ($this->customisedObj) ? $this->customisedObj : $this;
if($params) $obj = $this->customise($params);
return $template->process($obj);
}
/**
* Call this to disable site-wide basic authentication for a specific contoller.
* This must be called before Controller::init(). That is, you must call it in your controller's
* init method before it calls parent::init().
*/
public function disableBasicAuth() {
$this->basicAuthEnabled = false;
}
/**
* Returns the current controller
* @returns Controller
*/
public static function curr() {
if(Controller::$controller_stack) {
return Controller::$controller_stack[0];
} else {
user_error("No current controller available", E_USER_WARNING);
}
}
/**
* Tests whether we have a currently active controller or not
* @return boolean True if there is at least 1 controller in the stack.
*/
public static function has_curr() {
return Controller::$controller_stack ? true : false;
}
/**
* Returns true if the member is allowed to do the given action.
* @param perm The permission to be checked, such as 'View'.
* @param member The member whose permissions need checking. Defaults to the currently logged
* in user.
* @return boolean
*/
public function can($perm, $member = null) {
if(!$member) $member = Member::currentUser();
if(is_array($perm)) {
$perm = array_map(array($this, 'can'), $perm, array_fill(0, count($perm), $member));
return min($perm);
}
if($this->hasMethod($methodName = 'can' . $perm)) {
return $this->$methodName($member);
} else {
return true;
}
}
//---------------------------------------------------------------------------------------------------------------
/**
* Pushes this controller onto the stack of current controllers.
* This means that any redirection, session setting, or other things that rely on Controller::curr() will now
* write to this controller object.
*/
public function pushCurrent() {
array_unshift(self::$controller_stack, $this);
// Create a new session object
if(!$this->session) {
if(isset(self::$controller_stack[1])) {
$this->session = self::$controller_stack[1]->getSession();
} else {
$this->session = new Session(null);
}
}
}
/**
* Pop this controller off the top of the stack.
*/
public function popCurrent() {
if($this === self::$controller_stack[0]) {
array_shift(self::$controller_stack);
} else {
user_error("popCurrent called on $this->class controller, but it wasn't at the top of the stack",
E_USER_WARNING);
}
}
/**
* Redirect to the given URL.
*/
public function redirect($url, $code=302) {
if(!$this->response) $this->response = new SS_HTTPResponse();
if($this->response->getHeader('Location') && $this->response->getHeader('Location') != $url) {
user_error("Already directed to " . $this->response->getHeader('Location')
. "; now trying to direct to $url", E_USER_WARNING);
return;
}
// Attach site-root to relative links, if they have a slash in them
if($url=="" || $url[0]=='?' || (substr($url,0,4) != "http" && $url[0] != "/" && strpos($url,'/') !== false)) {
$url = Director::baseURL() . $url;
}
$this->response->redirect($url, $code);
}
/**
* Redirect back. Uses either the HTTP_REFERER or a manually set request-variable called "BackURL".
* This variable is needed in scenarios where not HTTP-Referer is sent (
* e.g when calling a page by location.href in IE).
* If none of the two variables is available, it will redirect to the base
* URL (see {@link Director::baseURL()}).
* @uses redirect()
*/
public function redirectBack() {
// Don't cache the redirect back ever
HTTP::set_cache_age(0);
$url = null;
// In edge-cases, this will be called outside of a handleRequest() context; in that case,
// redirect to the homepage - don't break into the global state at this stage because we'll
// be calling from a test context or something else where the global state is inappropraite
if($this->request) {
if($this->request->requestVar('BackURL')) {
$url = $this->request->requestVar('BackURL');
} else if($this->request->getHeader('Referer')) {
$url = $this->request->getHeader('Referer');
}
}
if(!$url) $url = Director::baseURL();
// absolute redirection URLs not located on this site may cause phishing
if(Director::is_site_url($url)) {
return $this->redirect($url);
} else {
return false;
}
}
/**
* Tests whether a redirection has been requested.
* @return string If redirect() has been called, it will return the URL redirected to. Otherwise, it will
* return null;
*/
public function redirectedTo() {
return $this->response && $this->response->getHeader('Location');
}
/**
* Get the Session object representing this Controller's session
* @return Session
*/
public function getSession() {
return $this->session;
}
/**
* Set the Session object.
*/
public function setSession(Session $session) {
$this->session = $session;
}
/**
* Joins two or more link segments together, putting a slash between them if necessary.
* Use this for building the results of {@link Link()} methods.
* If either of the links have query strings,
* then they will be combined and put at the end of the resulting url.
*
* Caution: All parameters are expected to be URI-encoded already.
*
* @param String
* @return String
*/
public static function join_links() {
$args = func_get_args();
$result = "";
$querystrings = array();
$fragmentIdentifier = null;
foreach($args as $arg) {
// Find fragment identifier - keep the last one
if(strpos($arg,'#') !== false) {
list($arg, $fragmentIdentifier) = explode('#',$arg,2);
}
// Find querystrings
if(strpos($arg,'?') !== false) {
list($arg, $suffix) = explode('?',$arg,2);
$querystrings[] = $suffix;
}
if((is_string($arg) && $arg) || is_numeric($arg)) {
$arg = (string)$arg;
if($result && substr($result,-1) != '/' && $arg[0] != '/') $result .= "/$arg";
else $result .= (substr($result, -1) == '/' && $arg[0] == '/') ? ltrim($arg, '/') : $arg;
}
}
if($querystrings) $result .= '?' . implode('&', $querystrings);
if($fragmentIdentifier) $result .= "#$fragmentIdentifier";
return $result;
}
public static function get_template_global_variables() {
return array(
'CurrentPage' => 'curr',
);
}
}
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