silverstripe-framework/src/Control/Controller.php
2018-06-13 11:33:45 +12:00

720 lines
21 KiB
PHP

<?php
namespace SilverStripe\Control;
use SilverStripe\Core\ClassInfo;
use SilverStripe\Dev\Debug;
use SilverStripe\Dev\Deprecation;
use SilverStripe\ORM\FieldType\DBHTMLText;
use SilverStripe\Security\BasicAuth;
use SilverStripe\Security\BasicAuthMiddleware;
use SilverStripe\Security\Member;
use SilverStripe\Security\Security;
use SilverStripe\View\SSViewer;
use SilverStripe\View\TemplateGlobalProvider;
/**
* Controllers are the cornerstone of all site functionality in SilverStripe. The {@link Director}
* selects a controller to pass control to, and then calls {@link handleRequest()}. 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.
*/
class Controller extends RequestHandler implements TemplateGlobalProvider
{
/**
* An array of arguments extracted from the URL.
*
* @var array
*/
protected $urlParams;
/**
* Contains all GET and POST parameters passed to the current {@link HTTPRequest}.
*
* @var array
*/
protected $requestParams;
/**
* The URL part matched on the current controller as determined by the "$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.
*
* @var string
*/
protected $action;
/**
* Stack of current controllers. Controller::$controller_stack[0] is the current controller.
*
* @var array
*/
protected static $controller_stack = array();
/**
* Assign templates for this controller.
* Map of action => template name
*
* @var array
*/
protected $templates = [];
/**
* @deprecated 4.1.0...5.0.0 Add this controller's url to
* SilverStripe\Security\BasicAuthMiddleware.URLPatterns injected property instead of setting false
* @var bool
*/
protected $basicAuthEnabled = true;
/**
* The response object that the controller returns.
*
* Set in {@link handleRequest()}.
*
* @var HTTPResponse
*/
protected $response;
/**
* Default URL handlers.
*
* @var array
*/
private static $url_handlers = array(
'$Action//$ID/$OtherID' => 'handleAction',
);
/**
* @var array
*/
private static $allowed_actions = array(
'handleAction',
'handleIndex',
);
/**
* Initialisation function that is run before any action on the controller is called.
*
* @uses BasicAuth::requireLogin()
*/
protected function init()
{
// @todo This will be removed in 5.0 and will be controlled by middleware instead
if ($this->basicAuthEnabled) {
BasicAuth::protect_site_if_necessary();
}
// This is used to test that subordinate controllers are actually calling parent::init() - a common bug
$this->baseInitCalled = true;
}
/**
* A stand in function to protect the init function from failing to be called as well as providing before and
* after hooks for the init function itself
*
* This should be called on all controllers before handling requests
*/
public function doInit()
{
//extension hook
$this->extend('onBeforeInit');
// Safety call
$this->baseInitCalled = false;
$this->init();
if (!$this->baseInitCalled) {
$class = static::class;
user_error(
"init() method on class '{$class}' doesn't call Controller::init()."
. "Make sure that you have parent::init() included.",
E_USER_WARNING
);
}
$this->extend('onAfterInit');
}
/**
* {@inheritdoc}
*
* Also set the URLParams
*/
public function setRequest($request)
{
$return = parent::setRequest($request);
$this->setURLParams($this->getRequest()->allParams());
return $return;
}
/**
* A bootstrap for the handleRequest method
*
* @todo setDataModel and setRequest are redundantly called in parent::handleRequest() - sort this out
*
* @param HTTPRequest $request
*/
protected function beforeHandleRequest(HTTPRequest $request)
{
//Set up the internal dependencies (request, response)
$this->setRequest($request);
//Push the current controller to protect against weird session issues
$this->pushCurrent();
$this->setResponse(new HTTPResponse());
//kick off the init functionality
$this->doInit();
}
/**
* Cleanup for the handleRequest method
*/
protected function afterHandleRequest()
{
//Pop the current controller from the stack
$this->popCurrent();
}
/**
* Executes this controller, and return an {@link HTTPResponse} object with the result.
*
* This method defers to {@link RequestHandler->handleRequest()} to determine which action
* should be executed
*
* Note: You should rarely need to overload handleRequest() -
* 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->beforeHandleRequest()
* and end the method with $this->afterHandleRequest()
*
* @param HTTPRequest $request
* @return HTTPResponse
*/
public function handleRequest(HTTPRequest $request)
{
if (!$request) {
user_error("Controller::handleRequest() not passed a request!", E_USER_ERROR);
}
//set up the controller for the incoming request
$this->beforeHandleRequest($request);
//if the before handler manipulated the response in a way that we shouldn't proceed, then skip our request
// handling
if (!$this->getResponse()->isFinished()) {
//retrieve the response for the request
$response = parent::handleRequest($request);
//prepare the response (we can receive an assortment of response types (strings/objects/HTTPResponses)
$this->prepareResponse($response);
}
//after request work
$this->afterHandleRequest();
//return the response
return $this->getResponse();
}
/**
* Prepare the response (we can receive an assortment of response types (strings/objects/HTTPResponses) and
* changes the controller response object appropriately
*
* @param HTTPResponse|Object $response
*/
protected function prepareResponse($response)
{
if ($response instanceof HTTPResponse) {
if (isset($_REQUEST['debug_request'])) {
$class = static::class;
Debug::message(
"Request handler returned HTTPResponse object to {$class} controller;"
. "returning it without modification."
);
}
$this->setResponse($response);
} else {
// Could be Controller, or ViewableData_Customised controller wrapper
if (ClassInfo::hasMethod($response, 'getViewer')) {
if (isset($_REQUEST['debug_request'])) {
$class = static::class;
$responseClass = get_class($response);
Debug::message(
"Request handler {$responseClass} object to {$class} controller;"
. "rendering with template returned by {$responseClass}::getViewer()"
);
}
$response = $response->getViewer($this->getAction())->process($response);
}
$this->getResponse()->setBody($response);
}
//deal with content if appropriate
ContentNegotiator::process($this->getResponse());
}
/**
* Controller's default action handler. It will call the method named in "$Action", if that method
* exists. If "$Action" isn't given, it will use "index" as a default.
*
* @param HTTPRequest $request
* @param string $action
*
* @return DBHTMLText|HTTPResponse
*/
protected function handleAction($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;
}
}
// Fall back to index action with before/after handlers
$beforeResult = $this->extend('beforeCallActionHandler', $request, $action);
if ($beforeResult) {
return reset($beforeResult);
}
$result = $this->getViewer($action)->process($this);
$afterResult = $this->extend('afterCallActionHandler', $request, $action, $result);
if ($afterResult) {
return reset($afterResult);
}
return $result;
}
/**
* @param array $urlParams
* @return $this
*/
public function setURLParams($urlParams)
{
$this->urlParams = $urlParams;
return $this;
}
/**
* Returns the parameters extracted from the URL by the {@link Director}.
*
* @return array
*/
public function getURLParams()
{
return $this->urlParams;
}
/**
* Returns the HTTPResponse object that this controller is building up. Can be used to set the
* status code and headers.
*
* @return HTTPResponse
*/
public function getResponse()
{
if (!$this->response) {
$this->setResponse(new HTTPResponse());
}
return $this->response;
}
/**
* Sets the HTTPResponse object that this controller is building up.
*
* @param HTTPResponse $response
*
* @return $this
*/
public function setResponse(HTTPResponse $response)
{
$this->response = $response;
return $this;
}
/**
* @var bool
*/
protected $baseInitCalled = false;
/**
* 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()}.
*
* @param string $action
* @return DBHTMLText
*/
public function defaultAction($action)
{
return $this->getViewer($action)->process($this);
}
/**
* Returns the action that is being executed on this controller.
*
* @return string
*/
public function getAction()
{
return $this->action;
}
/**
* Return the viewer identified being the default handler for this Controller/Action combination.
*
* @param string $action
*
* @return SSViewer
*/
public function getViewer($action)
{
// Hard-coded templates
if (isset($this->templates[$action]) && $this->templates[$action]) {
$templates = $this->templates[$action];
} elseif (isset($this->templates['index']) && $this->templates['index']) {
$templates = $this->templates['index'];
} elseif ($this->template) {
$templates = $this->template;
} else {
// Build templates based on class hierarchy
$actionTemplates = [];
$classTemplates = [];
$parentClass = static::class;
while ($parentClass !== parent::class) {
// _action templates have higher priority
if ($action && $action != 'index') {
$actionTemplates[] = strtok($parentClass, '_') . '_' . $action;
}
// class templates have lower priority
$classTemplates[] = strtok($parentClass, '_');
$parentClass = get_parent_class($parentClass);
}
// Add controller templates for inheritance chain
$templates = array_unique(array_merge($actionTemplates, $classTemplates));
}
return SSViewer::create($templates);
}
/**
* @param string $action
*
* @return bool
*/
public function hasAction($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.
*
* @param string $fullURL
* @param null|string $action
*
* @return string
*/
public function removeAction($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;
}
/**
* Return the class that defines the given action, so that we know where to check allowed_actions.
* Overrides RequestHandler to also look at defined templates.
*
* @param string $action
*
* @return string
*/
protected function definingClassForAction($action)
{
$definingClass = parent::definingClassForAction($action);
if ($definingClass) {
return $definingClass;
}
$class = static::class;
while ($class != 'SilverStripe\\Control\\RequestHandler') {
$templateName = strtok($class, '_') . '_' . $action;
if (SSViewer::hasTemplate($templateName)) {
return $class;
}
$class = get_parent_class($class);
}
return null;
}
/**
* 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 = static::class;
$templates = array();
while ($parentClass != __CLASS__) {
$templates[] = strtok($parentClass, '_') . '_' . $action;
$parentClass = get_parent_class($parentClass);
}
return SSViewer::hasTemplate($templates);
}
/**
* Render the current controller with the templates determined by {@link getViewer()}.
*
* @param array $params
*
* @return string
*/
public function render($params = null)
{
$template = $this->getViewer($this->getAction());
// if the object is already customised (e.g. through Controller->run()), use it
$obj = $this->getCustomisedObj() ?: $this;
if ($params) {
$obj = $this->customise($params);
}
return $template->process($obj);
}
/**
* Call this to disable site-wide basic authentication for a specific controller. This must be
* called before Controller::init(). That is, you must call it in your controller's init method
* before it calls parent::init().
*
* @deprecated 4.1.0...5.0.0 Add this controller's url to
* SilverStripe\Security\BasicAuthMiddleware.URLPatterns injected property instead of setting false
*/
public function disableBasicAuth()
{
Deprecation::notice(
'5.0',
'Add this controller\'s url to ' . BasicAuthMiddleware::class . '.URLPatterns injected property instead'
);
$this->basicAuthEnabled = false;
}
/**
* Returns the current controller.
*
* @return Controller
*/
public static function curr()
{
if (Controller::$controller_stack) {
return Controller::$controller_stack[0];
}
user_error("No current controller available", E_USER_WARNING);
return null;
}
/**
* Tests whether we have a currently active controller or not. True if there is at least 1
* controller in the stack.
*
* @return bool
*/
public static function has_curr()
{
return Controller::$controller_stack ? true : false;
}
/**
* Returns true if the member is allowed to do the given action. Defaults to the currently logged
* in user.
*
* @param string $perm
* @param null|member $member
*
* @return bool
*/
public function can($perm, $member = null)
{
if (!$member) {
$member = Security::getCurrentUser();
}
if (is_array($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.
*
* Note: Ensure this controller is assigned a request with a valid session before pushing
* it to the stack.
*/
public function pushCurrent()
{
// Ensure this controller has a valid session
$this->getRequest()->getSession();
array_unshift(self::$controller_stack, $this);
}
/**
* Pop this controller off the top of the stack.
*/
public function popCurrent()
{
if ($this === self::$controller_stack[0]) {
array_shift(self::$controller_stack);
} else {
$class = static::class;
user_error(
"popCurrent called on {$class} controller, but it wasn't at the top of the stack",
E_USER_WARNING
);
}
}
/**
* Redirect to the given URL.
*
* @param string $url
* @param int $code
* @return HTTPResponse
*/
public function redirect($url, $code = 302)
{
if ($this->getResponse()->getHeader('Location') && $this->getResponse()->getHeader('Location') != $url) {
user_error("Already directed to " . $this->getResponse()->getHeader('Location')
. "; now trying to direct to $url", E_USER_WARNING);
return null;
}
$response = parent::redirect($url, $code);
$this->setResponse($response);
return $response;
}
/**
* Tests whether a redirection has been requested. If redirect() has been called, it will return
* the URL redirected to. Otherwise, it will return null.
*
* @return null|string
*/
public function redirectedTo()
{
return $this->getResponse() && $this->getResponse()->getHeader('Location');
}
/**
* 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|array $arg,.. One or more link segments, or list of link segments as an array
* @return string
*/
public static function join_links($arg = null)
{
if (func_num_args() === 1 && is_array($arg)) {
$args = $arg;
} else {
$args = func_get_args();
}
$result = "";
$queryargs = 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('?', $arg, 2);
parse_str($suffix, $localargs);
$queryargs = array_merge($queryargs, $localargs);
}
if ((is_string($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, '/') : $arg;
}
}
}
if ($queryargs) {
$result .= '?' . http_build_query($queryargs);
}
if ($fragmentIdentifier) {
$result .= "#$fragmentIdentifier";
}
return $result;
}
/**
* @return array
*/
public static function get_template_global_variables()
{
return array(
'CurrentPage' => 'curr',
);
}
}