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<?php
declare(strict_types=1);
namespace Shaarli\Front\Controller\Visitor;
use Slim\Http\Request;
use Slim\Http\Response;
/**
* Class TagController
*
* Slim controller handle tags.
*/
class TagController extends ShaarliVisitorController
{
/**
* Add another tag in the current search through an HTTP redirection.
*
* @param array $args Should contain `newTag` key as tag to add to current search
*/
public function addTag(Request $request, Response $response, array $args): Response
{
$newTag = $args['newTag'] ?? null;
$referer = $this->container->environment['HTTP_REFERER'] ?? null;
// In case browser does not send HTTP_REFERER, we search a single tag
if (null === $referer) {
if (null !== $newTag) {
return $this->redirect($response, '/?searchtags='. urlencode($newTag));
}
return $this->redirect($response, '/');
}
$currentUrl = parse_url($referer);
parse_str($currentUrl['query'] ?? '', $params);
if (null === $newTag) {
return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
}
// Prevent redirection loop
if (isset($params['addtag'])) {
unset($params['addtag']);
}
// Check if this tag is already in the search query and ignore it if it is.
// Each tag is always separated by a space
$currentTags = isset($params['searchtags']) ? explode(' ', $params['searchtags']) : [];
$addtag = true;
foreach ($currentTags as $value) {
if ($value === $newTag) {
$addtag = false;
break;
}
}
// Append the tag if necessary
if (true === $addtag) {
$currentTags[] = trim($newTag);
}
$params['searchtags'] = trim(implode(' ', $currentTags));
// We also remove page (keeping the same page has no sense, since the results are different)
unset($params['page']);
return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
}
/**
* Remove a tag from the current search through an HTTP redirection.
*
* @param array $args Should contain `tag` key as tag to remove from current search
*/
public function removeTag(Request $request, Response $response, array $args): Response
{
$referer = $this->container->environment['HTTP_REFERER'] ?? null;
// If the referrer is not provided, we can update the search, so we failback on the bookmark list
if (empty($referer)) {
return $this->redirect($response, '/');
}
$tagToRemove = $args['tag'] ?? null;
$currentUrl = parse_url($referer);
parse_str($currentUrl['query'] ?? '', $params);
if (null === $tagToRemove) {
return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
}
// Prevent redirection loop
if (isset($params['removetag'])) {
unset($params['removetag']);
}
if (isset($params['searchtags'])) {
$tags = explode(' ', $params['searchtags']);
// Remove value from array $tags.
$tags = array_diff($tags, [$tagToRemove]);
$params['searchtags'] = implode(' ', $tags);
if (empty($params['searchtags'])) {
unset($params['searchtags']);
}
// We also remove page (keeping the same page has no sense, since the results are different)
unset($params['page']);
}
$queryParams = count($params) > 0 ? '?' . http_build_query($params) : '';
return $response->withRedirect(($currentUrl['path'] ?? './') . $queryParams);
}
}
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