mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
39952f4a5c
These APIs are primarily intended to let developers write custom 404 handlers. They can define an onBeforeHTTPError404() method on an Extension that gets added to Controller or RequestHandler. The SS_HTTPResponse_Exception object has also been tidied up to override the status info of any SS_HTTPResponse object that might get passed. This is mainly to make it easier for callers (such as ContentController and ModelAsController) to use RequestHandler::httpError() more consistently.
375 lines
15 KiB
PHP
375 lines
15 KiB
PHP
<?php
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/**
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* This class is the base class of any SilverStripe object that can be used to handle HTTP requests.
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*
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* Any RequestHandler object can be made responsible for handling its own segment of the URL namespace.
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* The {@link Director} begins the URL parsing process; it will parse the beginning of the URL to identify which
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* controller is being used. It will then call {@link handleRequest()} on that Controller, passing it the parameters that it
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* parsed from the URL, and the {@link SS_HTTPRequest} that contains the remainder of the URL to be parsed.
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*
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* You can use ?debug_request=1 to view information about the different components and rule matches for a specific URL.
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*
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* In SilverStripe, URL parsing is distributed throughout the object graph. For example, suppose that we have a search form
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* that contains a {@link TreeMultiSelectField} named "Groups". We want to use ajax to load segments of this tree as they are needed
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* rather than downloading the tree right at the beginning. We could use this URL to get the tree segment that appears underneath
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* Group #36: "admin/crm/SearchForm/field/Groups/treesegment/36"
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* - Director will determine that admin/crm is controlled by a new ModelAdmin object, and pass control to that.
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* Matching Director Rule: "admin/crm" => "ModelAdmin" (defined in mysite/_config.php)
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* - ModelAdmin will determine that SearchForm is controlled by a Form object returned by $this->SearchForm(), and pass control to that.
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* Matching $url_handlers: "$Action" => "$Action" (defined in RequestHandler class)
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* - Form will determine that field/Groups is controlled by the Groups field, a TreeMultiselectField, and pass control to that.
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* Matching $url_handlers: 'field/$FieldName!' => 'handleField' (defined in Form class)
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* - TreeMultiselectField will determine that treesegment/36 is handled by its treesegment() method. This method will return an HTML fragment that is output to the screen.
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* Matching $url_handlers: "$Action/$ID" => "handleItem" (defined in TreeMultiSelectField class)
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*
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* {@link RequestHandler::handleRequest()} is where this behaviour is implemented.
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*
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* @package framework
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* @subpackage control
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*/
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class RequestHandler extends ViewableData {
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/**
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* @var SS_HTTPRequest $request The request object that the controller was called with.
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* Set in {@link handleRequest()}. Useful to generate the {}
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*/
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protected $request = null;
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/**
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* The DataModel for this request
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*/
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protected $model = null;
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/**
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* This variable records whether RequestHandler::__construct()
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* was called or not. Useful for checking if subclasses have
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* called parent::__construct()
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*
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* @var boolean
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*/
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protected $brokenOnConstruct = true;
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/**
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* The default URL handling rules. This specifies that the next component of the URL corresponds to a method to
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* be called on this RequestHandlingData object.
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*
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* The keys of this array are parse rules. See {@link SS_HTTPRequest::match()} for a description of the rules available.
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*
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* The values of the array are the method to be called if the rule matches. If this value starts with a '$', then the
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* named parameter of the parsed URL wil be used to determine the method name.
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*/
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static $url_handlers = array(
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'$Action' => '$Action',
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);
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/**
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* Define a list of action handling methods that are allowed to be called directly by URLs.
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* The variable should be an array of action names. This sample shows the different values that it can contain:
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*
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* <code>
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* array(
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* 'someaction', // someaction can be accessed by anyone, any time
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* 'otheraction' => true, // So can otheraction
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* 'restrictedaction' => 'ADMIN', // restrictedaction can only be people with ADMIN privilege
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* 'complexaction' '->canComplexAction' // complexaction can only be accessed if $this->canComplexAction() returns true
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* );
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* </code>
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*
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* Form getters count as URL actions as well, and should be included in allowed_actions.
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* Form actions on the other handed (first argument to {@link FormAction()} shoudl NOT be included,
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* these are handled separately through {@link Form->httpSubmission}. You can control access on form actions
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* either by conditionally removing {@link FormAction} in the form construction,
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* or by defining $allowed_actions in your {@link Form} class.
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*/
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static $allowed_actions = null;
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public function __construct() {
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$this->brokenOnConstruct = false;
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// Check necessary to avoid class conflicts before manifest is rebuilt
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if(class_exists('NullHTTPRequest')) $this->request = new NullHTTPRequest();
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// This will prevent bugs if setDataModel() isn't called.
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$this->model = DataModel::inst();
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parent::__construct();
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}
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/**
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* Set the DataModel for this request.
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*/
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public function setDataModel($model) {
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$this->model = $model;
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}
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/**
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* Handles URL requests.
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*
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* - ViewableData::handleRequest() iterates through each rule in {@link self::$url_handlers}.
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* - If the rule matches, the named method will be called.
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* - If there is still more URL to be processed, then handleRequest()
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* is called on the object that that method returns.
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*
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* Once all of the URL has been processed, the final result is returned.
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* However, if the final result is an array, this
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* array is interpreted as being additional template data to customise the
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* 2nd to last result with, rather than an object
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* in its own right. This is most frequently used when a Controller's
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* action will return an array of data with which to
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* customise the controller.
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*
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* @param $request The {@link SS_HTTPRequest} object that is reponsible for distributing URL parsing
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* @uses SS_HTTPRequest
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* @uses SS_HTTPRequest->match()
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* @return SS_HTTPResponse|RequestHandler|string|array
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*/
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public function handleRequest(SS_HTTPRequest $request, DataModel $model) {
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// $handlerClass is used to step up the class hierarchy to implement url_handlers inheritance
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$handlerClass = ($this->class) ? $this->class : get_class($this);
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if($this->brokenOnConstruct) {
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user_error("parent::__construct() needs to be called on {$handlerClass}::__construct()", E_USER_WARNING);
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}
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$this->request = $request;
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$this->setDataModel($model);
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// We stop after RequestHandler; in other words, at ViewableData
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while($handlerClass && $handlerClass != 'ViewableData') {
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$urlHandlers = Config::inst()->get($handlerClass, 'url_handlers', Config::FIRST_SET);
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if($urlHandlers) foreach($urlHandlers as $rule => $action) {
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if(isset($_REQUEST['debug_request'])) Debug::message("Testing '$rule' with '" . $request->remaining() . "' on $this->class");
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if($params = $request->match($rule, true)) {
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// Backwards compatible setting of url parameters, please use SS_HTTPRequest->latestParam() instead
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//Director::setUrlParams($request->latestParams());
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if(isset($_REQUEST['debug_request'])) {
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Debug::message("Rule '$rule' matched to action '$action' on $this->class. Latest request params: " . var_export($request->latestParams(), true));
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}
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// Actions can reference URL parameters, eg, '$Action/$ID/$OtherID' => '$Action',
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if($action[0] == '$') $action = $params[substr($action,1)];
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if($this->checkAccessAction($action)) {
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if(!$action) {
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if(isset($_REQUEST['debug_request'])) Debug::message("Action not set; using default action method name 'index'");
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$action = "index";
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} else if(!is_string($action)) {
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user_error("Non-string method name: " . var_export($action, true), E_USER_ERROR);
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}
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try {
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if(!$this->hasMethod($action)) {
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return $this->httpError(404, "Action '$action' isn't available on class " . get_class($this) . ".");
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}
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$result = $this->$action($request);
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} catch(SS_HTTPResponse_Exception $responseException) {
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$result = $responseException->getResponse();
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}
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} else {
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return $this->httpError(403, "Action '$action' isn't allowed on class " . get_class($this) . ".");
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}
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if($result instanceof SS_HTTPResponse && $result->isError()) {
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if(isset($_REQUEST['debug_request'])) Debug::message("Rule resulted in HTTP error; breaking");
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return $result;
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}
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// If we return a RequestHandler, call handleRequest() on that, even if there is no more URL to parse.
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// It might have its own handler. However, we only do this if we haven't just parsed an empty rule ourselves,
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// to prevent infinite loops. Also prevent further handling of controller actions which return themselves
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// to avoid infinite loops.
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if($this !== $result && !$request->isEmptyPattern($rule) && is_object($result) && $result instanceof RequestHandler) {
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$returnValue = $result->handleRequest($request, $model);
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// Array results can be used to handle
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if(is_array($returnValue)) $returnValue = $this->customise($returnValue);
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return $returnValue;
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// If we return some other data, and all the URL is parsed, then return that
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} else if($request->allParsed()) {
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return $result;
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// But if we have more content on the URL and we don't know what to do with it, return an error.
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} else {
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return $this->httpError(404, "I can't handle sub-URLs of a $this->class object.");
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}
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return $this;
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}
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}
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$handlerClass = get_parent_class($handlerClass);
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}
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// If nothing matches, return this object
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return $this;
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}
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/**
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* Get a unified array of allowed actions on this controller (if such data is available) from both the controller
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* ancestry and any extensions.
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*
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* @return array|null
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*/
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public function allowedActions() {
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$actions = Config::inst()->get(get_class($this), 'allowed_actions');
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if($actions) {
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// convert all keys and values to lowercase to
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// allow for easier comparison, unless it is a permission code
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$actions = array_change_key_case($actions, CASE_LOWER);
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foreach($actions as $key => $value) {
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if(is_numeric($key)) $actions[$key] = strtolower($value);
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}
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return $actions;
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}
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}
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/**
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* Checks if this request handler has a specific action (even if the current user cannot access it).
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*
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* @param string $action
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* @return bool
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*/
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public function hasAction($action) {
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if($action == 'index') return true;
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$action = strtolower($action);
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$actions = $this->allowedActions();
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// Check if the action is defined in the allowed actions as either a
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// key or value. Note that if the action is numeric, then keys are not
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// searched for actions to prevent actual array keys being recognised
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// as actions.
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if(is_array($actions)) {
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$isKey = !is_numeric($action) && array_key_exists($action, $actions);
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$isValue = in_array($action, $actions, true);
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$isWildcard = (in_array('*', $actions) && $this->checkAccessAction($action));
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if($isKey || $isValue || $isWildcard) return true;
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}
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if(!is_array($actions) || !$this->config()->get('allowed_actions', Config::UNINHERITED | Config::EXCLUDE_EXTRA_SOURCES)) {
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if($action != 'init' && $action != 'run' && method_exists($this, $action)) return true;
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}
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return false;
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}
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/**
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* Check that the given action is allowed to be called from a URL.
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* It will interrogate {@link self::$allowed_actions} to determine this.
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*/
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public function checkAccessAction($action) {
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$actionOrigCasing = $action;
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$action = strtolower($action);
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$allowedActions = $this->allowedActions();
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if($allowedActions) {
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// check for specific action rules first, and fall back to global rules defined by asterisk
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foreach(array($action,'*') as $actionOrAll) {
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// check if specific action is set
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if(isset($allowedActions[$actionOrAll])) {
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$test = $allowedActions[$actionOrAll];
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if($test === true || $test === 1 || $test === '1') {
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// Case 1: TRUE should always allow access
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return true;
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} elseif(substr($test, 0, 2) == '->') {
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// Case 2: Determined by custom method with "->" prefix
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list($method, $arguments) = Object::parse_class_spec(substr($test, 2));
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return call_user_func_array(array($this, $method), $arguments);
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} else {
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// Case 3: Value is a permission code to check the current member against
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return Permission::check($test);
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}
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} elseif((($key = array_search($actionOrAll, $allowedActions, true)) !== false) && is_numeric($key)) {
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// Case 4: Allow numeric array notation (search for array value as action instead of key)
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return true;
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}
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}
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}
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// If we get here an the action is 'index', then it hasn't been specified, which means that
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// it should be allowed.
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if($action == 'index' || empty($action)) return true;
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if($allowedActions === null || !$this->config()->get('allowed_actions', Config::UNINHERITED | Config::EXCLUDE_EXTRA_SOURCES)) {
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// If no allowed_actions are provided, then we should only let through actions that aren't handled by magic methods
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// we test this by calling the unmagic method_exists.
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if(method_exists($this, $action)) {
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// Disallow any methods which aren't defined on RequestHandler or subclasses
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// (e.g. ViewableData->getSecurityID())
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$r = new ReflectionClass(get_class($this));
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if($r->hasMethod($actionOrigCasing)) {
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$m = $r->getMethod($actionOrigCasing);
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return ($m && is_subclass_of($m->getDeclaringClass()->getName(), 'RequestHandler'));
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} else {
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throw new Exception("method_exists() true but ReflectionClass can't find method - PHP is b0kred");
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}
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} else if(!$this->hasMethod($action)){
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// Return true so that a template can handle this action
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return true;
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}
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}
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return false;
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}
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/**
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* Throws a HTTP error response encased in a {@link SS_HTTPResponse_Exception}, which is later caught in
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* {@link RequestHandler::handleAction()} and returned to the user.
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*
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* @param int $errorCode
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* @param string $errorMessage Plaintext error message
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* @uses SS_HTTPResponse_Exception
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*/
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public function httpError($errorCode, $errorMessage = null) {
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// Call a handler method such as onBeforeHTTPError404
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$this->extend('onBeforeHTTPError' . $errorCode, $this->request);
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// Call a handler method such as onBeforeHTTPError, passing 404 as the first arg
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$this->extend('onBeforeHTTPError', $errorCode, $this->request);
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// Throw a new exception
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throw new SS_HTTPResponse_Exception($errorMessage, $errorCode);
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}
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/**
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* @deprecated 3.0 Use SS_HTTPRequest->isAjax() instead (through Controller->getRequest())
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*/
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public function isAjax() {
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Deprecation::notice('3.0', 'Use SS_HTTPRequest->isAjax() instead (through Controller->getRequest())');
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return $this->request->isAjax();
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}
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/**
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* Returns the SS_HTTPRequest object that this controller is using.
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* Returns a placeholder {@link NullHTTPRequest} object unless
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* {@link handleAction()} or {@link handleRequest()} have been called,
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* which adds a reference to an actual {@link SS_HTTPRequest} object.
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*
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* @return SS_HTTPRequest|NullHTTPRequest
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*/
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public function getRequest() {
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return $this->request;
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}
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/**
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* Typically the request is set through {@link handleAction()}
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* or {@link handleRequest()}, but in some based we want to set it manually.
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*
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* @param SS_HTTPRequest
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*/
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public function setRequest($request) {
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$this->request = $request;
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}
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}
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