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<?php |
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namespace SilverStripe\Control; |
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use SilverStripe\Core\Convert; |
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use InvalidArgumentException; |
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/** |
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* Handle the X-Pjax header that AJAX responses may provide, returning the |
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* fragment, or, in the case of non-AJAX form submissions, redirecting back |
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* to the submitter. |
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* |
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* X-Pjax ensures that users won't end up seeing the unstyled form HTML in |
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* their browser. |
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* |
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* If a JS error prevents the Ajax overriding of form submissions from happening. |
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* |
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* It also provides better non-JS operation. |
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* |
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* Caution: This API is volatile, and might eventually be replaced by a generic |
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* action helper system for controllers. |
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*/ |
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class PjaxResponseNegotiator |
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{ |
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/** |
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* See {@link respond()} |
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* |
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* @var array |
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*/ |
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protected $callbacks = array(); |
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protected $response = null; |
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/** |
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* Overriden fragments (if any). Otherwise uses fragments from the request. |
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*/ |
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protected $fragmentOverride = null; |
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/** |
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* @param array $callbacks |
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* @param HTTPResponse $response An existing response to reuse (optional) |
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*/ |
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public function __construct($callbacks = array(), $response = null) |
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{ |
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$this->callbacks = $callbacks; |
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$this->response = $response; |
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} |
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public function getResponse() |
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{ |
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if (!$this->response) { |
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$this->response = new HTTPResponse(); |
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} |
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return $this->response; |
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} |
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public function setResponse($response) |
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{ |
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$this->response = $response; |
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} |
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/** |
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* Out of the box, the handler "CurrentForm" value, which will return the rendered form. |
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* Non-Ajax calls will redirect back. |
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* |
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* @param HTTPRequest $request |
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* @param array $extraCallbacks List of anonymous functions or callables returning either a string |
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* or HTTPResponse, keyed by their fragment identifier. The 'default' key can |
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* be used as a fallback for non-ajax responses. |
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* @return HTTPResponse |
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* @throws HTTPResponse_Exception |
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*/ |
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public function respond(HTTPRequest $request, $extraCallbacks = array()) |
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{ |
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// Prepare the default options and combine with the others |
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$callbacks = array_merge($this->callbacks, $extraCallbacks); |
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$response = $this->getResponse(); |
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$responseParts = array(); |
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if (isset($this->fragmentOverride)) { |
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$fragments = $this->fragmentOverride; |
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} elseif ($fragmentStr = $request->getHeader('X-Pjax')) { |
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$fragments = explode(',', $fragmentStr); |
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} else { |
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if ($request->isAjax()) { |
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throw new HTTPResponse_Exception("Ajax requests to this URL require an X-Pjax header.", 400); |
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} elseif (empty($callbacks['default'])) { |
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throw new HTTPResponse_Exception("Missing default response handler for this URL", 400); |
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} |
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$response->setBody(call_user_func($callbacks['default'])); |
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return $response; |
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} |
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// Execute the fragment callbacks and build the response. |
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foreach ($fragments as $fragment) { |
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if (isset($callbacks[$fragment])) { |
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$res = call_user_func($callbacks[$fragment]); |
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$responseParts[$fragment] = $res ? (string) $res : $res; |
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} else { |
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throw new HTTPResponse_Exception("X-Pjax = '$fragment' not supported for this URL.", 400); |
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} |
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} |
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$response->setBody(Convert::raw2json($responseParts)); |
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$response->addHeader('Content-Type', 'text/json'); |
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return $response; |
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} |
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/** |
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* @param string $fragment |
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* @param Callable $callback |
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*/ |
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public function setCallback($fragment, $callback) |
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{ |
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$this->callbacks[$fragment] = $callback; |
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} |
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/** |
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* Set up fragment overriding - will completely replace the incoming fragments. |
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* |
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* @param array $fragments Fragments to insert. |
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* @return $this |
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*/ |
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public function setFragmentOverride($fragments) |
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{ |
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if (!is_array($fragments)) { |
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throw new InvalidArgumentException("fragments must be an array"); |
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} |
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$this->fragmentOverride = $fragments; |
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return $this; |
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} |
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/** |
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* @return array |
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*/ |
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public function getFragmentOverride() |
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{ |
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return $this->fragmentOverride; |
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} |
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} |
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silverstripe /
silverstripe-framework
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