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<?php |
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declare(strict_types=1); |
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namespace Nexendrie\Rss; |
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/** |
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* RSS Channel Generator |
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* |
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* @author Jakub Konečný |
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* @property string $title |
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* @property string $description |
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* @property string $link |
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* @property callable $dataSource |
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* @property int $shortenDescription |
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* @property string $dateTimeFormat |
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* @property callable $lastBuildDate |
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* @method void onBeforeGenerate(Generator $generator) |
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* @method void onAddItem(Generator $generator, \SimpleXMLElement $channel, RssChannelItem $itemDefinition, \SimpleXMLElement $item) |
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* @method void onAfterGenerate(Generator $generator) |
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*/ |
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final class Generator { |
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use \Nette\SmartObject; |
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/** @var string */ |
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protected $title = ""; |
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/** @var string */ |
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protected $description = ""; |
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/** @var string */ |
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protected $link = ""; |
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/** @var string */ |
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protected $dateTimeFormat = "Y-m-d H:i:s"; |
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/** @var callable|null */ |
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protected $dataSource = NULL; |
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/** @var int */ |
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protected $shortenDescription = 150; |
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/** @var callable */ |
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protected $lastBuildDate = "time"; |
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/** @var callable[] */ |
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public $onBeforeGenerate = []; |
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/** @var callable[] */ |
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public $onAddItem = []; |
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/** @var callable[] */ |
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public $onAfterGenerate = []; |
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public function getTitle(): string { |
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return $this->title; |
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} |
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public function setTitle(string $title) { |
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$this->title = $title; |
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} |
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public function getDescription(): string { |
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return $this->description; |
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} |
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public function setDescription(string $description) { |
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$this->description = $description; |
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} |
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public function getLink(): string { |
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return $this->link; |
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} |
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public function setLink(string $link) { |
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$this->link = $link; |
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} |
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public function setDataSource(callable $dataSource) { |
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$this->dataSource = $dataSource; |
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} |
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public function getShortenDescription(): int { |
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return $this->shortenDescription; |
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} |
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public function setShortenDescription(int $value) { |
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$this->shortenDescription = $value; |
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} |
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public function getDateTimeFormat(): string { |
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return $this->dateTimeFormat; |
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} |
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public function setDateTimeFormat(string $format) { |
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$this->dateTimeFormat = $format; |
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} |
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public function getLastBuildDate() { |
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return $this->lastBuildDate; |
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} |
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public function setLastBuildDate(callable $lastBuildDate) { |
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$this->lastBuildDate = $lastBuildDate; |
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} |
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/** |
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* @throws InvalidStateException |
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* @throws \InvalidArgumentException |
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*/ |
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protected function getData(): Collection { |
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if(is_null($this->dataSource)) { |
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throw new InvalidStateException("Data source for RSS generator is not set."); |
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} |
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$items = call_user_func($this->dataSource); |
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if(!$items instanceof Collection) { |
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throw new \InvalidArgumentException("Callback for data source for RSS generator has to return " . Collection::class . "."); |
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} |
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return $items; |
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} |
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protected function shortenDescription(string $description): string { |
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if($this->shortenDescription < 1) { |
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return $description; |
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} |
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$originalDescription = $description; |
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$description = substr($description, 0, $this->shortenDescription); |
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if($description !== $originalDescription) { |
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$description .= "..."; |
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} |
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return $description; |
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} |
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protected function writeProperty(\SimpleXMLElement &$channel, string $property): void { |
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if(isset($this->$property) AND $this->$property !== "") { |
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$channel->channel->{$property}[0][0] = $this->$property; |
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} |
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} |
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/** |
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* @throws InvalidStateException |
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* @throws \InvalidArgumentException |
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*/ |
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public function generate(): \SimpleXMLElement { |
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$this->onBeforeGenerate($this); |
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$items = $this->getData(); |
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$lastBuildDate = call_user_func($this->lastBuildDate); |
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if(!is_int($lastBuildDate)) { |
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throw new \InvalidArgumentException("Callback for last build date for RSS generator has to return integer."); |
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} |
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$channel = simplexml_load_file(__DIR__ . "/template.xml"); |
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$channel->channel->lastBuildDate[0][0] = date($this->dateTimeFormat, $lastBuildDate); |
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$this->writeProperty($channel, "link"); |
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$this->writeProperty($channel, "title"); |
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$this->writeProperty($channel, "description"); |
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/** @var RssChannelItem $item */ |
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foreach($items as $item) { |
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/** @var \SimpleXMLElement $i */ |
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$i = $channel->channel->addChild("item"); |
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$i->addChild("title", $item->title); |
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$i->addChild("link", $item->link); |
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$i->addChild("pubDate", $item->pubDate); |
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$i->addChild("description", $this->shortenDescription($item->description)); |
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$this->onAddItem($this, $channel, $item, $i); |
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} |
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$this->onAfterGenerate($this); |
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return $channel; |
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} |
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/** |
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* @throws InvalidStateException |
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* @throws \InvalidArgumentException |
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*/ |
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public function response(): RssResponse { |
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try { |
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return new RssResponse($this->generate()); |
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} catch(InvalidStateException | \InvalidArgumentException $e) { |
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throw $e; |
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} |
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} |
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} |
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?> |
nexendrie /
rss
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