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<?php |
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declare(strict_types=1); |
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/** |
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* balloon |
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* |
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* @copyright Copryright (c) 2012-2018 gyselroth GmbH (https://gyselroth.com) |
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* @license GPL-3.0 https://opensource.org/licenses/GPL-3.0 |
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*/ |
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namespace Balloon\App\Notification; |
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use Balloon\Filesystem\Node\AttributeDecorator; |
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use Balloon\Filesystem\Node\NodeInterface; |
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use Balloon\Server; |
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use Balloon\Server\AttributeDecorator as RoleAttributeDecorator; |
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use Balloon\Server\User; |
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use InvalidArgumentException; |
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class TemplateHandler |
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{ |
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/** |
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* Attribute decorator. |
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* |
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* @var AttributeDecorator |
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*/ |
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protected $decorator; |
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/** |
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* Role Attribute decorator. |
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* |
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* @var RoleAttributeDecorator |
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*/ |
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protected $role_decorator; |
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/** |
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* Asset directory. |
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* |
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* @var string |
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*/ |
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protected $asset_dir = __DIR__.DIRECTORY_SEPARATOR.'assets'; |
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/** |
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* Fallback locale. |
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* |
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* @var string |
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*/ |
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protected $fallback_locale = 'en_US'; |
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/** |
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* Loaded locales. |
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* |
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* @var array |
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*/ |
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protected $locales = []; |
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/** |
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* Server. |
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* |
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* @var string |
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*/ |
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protected $server; |
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/** |
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* Server context. |
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* |
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* @var array |
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*/ |
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protected $context = []; |
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/** |
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* Constructor. |
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*/ |
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public function __construct(Server $server, AttributeDecorator $decorator, RoleAttributeDecorator $role_decorator) |
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{ |
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$this->decorator = $decorator; |
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$this->role_decorator = $role_decorator; |
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$this->context['server_url'] = $server->getServerUrl(); |
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} |
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/** |
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* Set config. |
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* |
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* @param iterable $config |
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* |
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* @return TemplateHandler |
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*/ |
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public function setOptions(?Iterable $config = null): self |
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{ |
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if (null === $config) { |
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return $this; |
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} |
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foreach ($config as $option => $value) { |
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switch ($option) { |
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case 'asset_dir': |
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case 'fallback_locale': |
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$this->{$option} = (string) $value; |
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break; |
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default: |
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throw new InvalidArgumentException('invalid option '.$option.' given'); |
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} |
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} |
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return $this; |
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} |
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/** |
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* Parse body. |
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*/ |
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public function getBody(string $notification, array $context = []): string |
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{ |
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return $this->parseString($notification, 'body', $context + $this->context); |
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} |
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/** |
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* Parse subject. |
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*/ |
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public function getSubject(string $notification, array $context = []): string |
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{ |
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return $this->parseString($notification, 'subject', $context + $this->context); |
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} |
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/** |
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* Render template. |
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*/ |
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public function renderTemplate(string $notification, string $template, array $context = []): string |
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{ |
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$path = $this->asset_dir.DIRECTORY_SEPARATOR.'templates'.DIRECTORY_SEPARATOR.$template; |
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$context += [ |
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'subject' => $this->parseString($notification, 'subject', $context + $this->context), |
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'body' => $this->parseString($notification, 'body', $context + $this->context), |
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]; |
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$template = new Template($path, $this->getLocale($context), $context + $this->context); |
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return $template->render(); |
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} |
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/** |
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* Load locale. |
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*/ |
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protected function loadLocale(string $locale): ?array |
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{ |
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if (isset($this->locales[$locale])) { |
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return $this->locales[$locale]; |
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} |
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$path = $this->asset_dir.DIRECTORY_SEPARATOR.'locales'.DIRECTORY_SEPARATOR.$locale.'.json'; |
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if (is_readable($path)) { |
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$i18n = json_decode(file_get_contents($path)); |
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if (json_last_error() !== 0) { |
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throw new Exception\TemplateInvalidLocale('locale '.$locale.' is invalid json'); |
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} |
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return $this->locales[$locale] = json_decode(file_get_contents($path), true); |
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} |
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return null; |
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} |
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/** |
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* Get correct locale for context. |
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*/ |
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protected function getLocale(array $context) |
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{ |
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$locale = null; |
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if (isset($context['user'])) { |
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$locale = $context['user']->getAttributes()['locale']; |
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} elseif (isset($context['sender'])) { |
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$locale = $context['sender']->getAttributes()['locale']; |
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} |
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$i18n = $this->loadLocale($locale); |
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if ($i18n === null) { |
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$locale = $this->fallback_locale; |
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$i18n = $this->loadLocale($locale); |
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} |
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if ($i18n === null) { |
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throw new Exception\TemplateInvalidLocale('locale '.$locale.' does not exists'); |
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} |
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return $i18n; |
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} |
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/** |
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* Parse locale string. |
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*/ |
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protected function parseString(string $notification, string $type, array $context): string |
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{ |
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$i18n = $this->getLocale($context); |
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if (!isset($i18n['type'][$notification][$type])) { |
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throw new Exception\TemplateInvalidLocale('locale does not have a type '.$type); |
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} |
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$string = $i18n['type'][$notification][$type]; |
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if (isset($context['node'])) { |
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$string = $this->decorateNode($string, $context['node']); |
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} |
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if (isset($context['user'])) { |
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$string = $this->decorateUser($string, $context['user']); |
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} |
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return $this->decorate($string, $context); |
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} |
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/** |
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* Replace variables. |
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*/ |
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protected function decorate(string $template, array $context): string |
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{ |
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return preg_replace_callback('/\{([^}\.]*)\}/', function ($match) use ($context) { |
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$key = $match[1]; |
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if (isset($context[$key])) { |
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return $context[$key]; |
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} |
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}, $template); |
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} |
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/** |
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* Replace variables. |
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*/ |
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protected function decorateNode(string $template, NodeInterface $node): string |
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{ |
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$decorator = $this->decorator; |
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return preg_replace_callback('/(\{node\.(([a-z]\.*)+)\})/', function ($match) use ($node, $decorator) { |
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$key = explode('.', $match[2]); |
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$key = array_shift($key); |
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$attrs = $decorator->decorate($node, [$key]); |
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return $this->getArrayValue($attrs, $match[2]); |
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}, $template); |
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} |
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/** |
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* Replace variables. |
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*/ |
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protected function decorateUser(string $template, User $user): string |
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{ |
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$role_decorator = $this->role_decorator; |
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return preg_replace_callback('/(\{user\.(([a-z]\.*)+)\})/', function ($match) use ($user, $role_decorator) { |
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$key = explode('.', $match[2]); |
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$key = array_shift($key); |
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$attrs = $role_decorator->decorate($user, [$key]); |
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return $this->getArrayValue($attrs, $match[2]); |
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}, $template); |
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} |
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/** |
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* Get array value via string path. |
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*/ |
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protected function getArrayValue(Iterable $array, string $path, string $separator = '.') |
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{ |
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if (isset($array[$path])) { |
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return $array[$path]; |
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} |
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$keys = explode($separator, $path); |
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foreach ($keys as $key) { |
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if (!isset($array[$key])) { |
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return ''; |
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} |
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$array = $array[$key]; |
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} |
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return $array; |
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} |
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} |
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Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: