application/front/controller/visitor/TagController.php

   1 <?php
   2
   3 declare(strict_types=1);
   4
   5 namespace Shaarli\Front\Controller\Visitor;
   6
   7 use Slim\Http\Request;
   8 use Slim\Http\Response;
   9
  10 /**
  11  * Class TagController
  12  *
  13  * Slim controller handle tags.
  14  */
  15 class TagController extends ShaarliVisitorController
  16 {
  17     /**
  18      * Add another tag in the current search through an HTTP redirection.
  19      *
  20      * @param array $args Should contain `newTag` key as tag to add to current search
  21      */
  22     public function addTag(Request $request, Response $response, array $args): Response
  23     {
  24         $newTag = $args['newTag'] ?? null;
  25         $referer = $this->container->environment['HTTP_REFERER'] ?? null;
  26
  27         // In case browser does not send HTTP_REFERER, we search a single tag
  28         if (null === $referer) {
  29             if (null !== $newTag) {
  30                 return $this->redirect($response, '/?searchtags='. urlencode($newTag));
  31             }
  32
  33             return $this->redirect($response, '/');
  34         }
  35
  36         $currentUrl = parse_url($referer);
  37         parse_str($currentUrl['query'] ?? '', $params);
  38
  39         if (null === $newTag) {
  40             return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
  41         }
  42
  43         // Prevent redirection loop
  44         if (isset($params['addtag'])) {
  45             unset($params['addtag']);
  46         }
  47
  48         // Check if this tag is already in the search query and ignore it if it is.
  49         // Each tag is always separated by a space
  50         $currentTags = isset($params['searchtags']) ? explode(' ', $params['searchtags']) : [];
  51
  52         $addtag = true;
  53         foreach ($currentTags as $value) {
  54             if ($value === $newTag) {
  55                 $addtag = false;
  56                 break;
  57             }
  58         }
  59
  60         // Append the tag if necessary
  61         if (true === $addtag) {
  62             $currentTags[] = trim($newTag);
  63         }
  64
  65         $params['searchtags'] = trim(implode(' ', $currentTags));
  66
  67         // We also remove page (keeping the same page has no sense, since the results are different)
  68         unset($params['page']);
  69
  70         return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
  71     }
  72
  73     /**
  74      * Remove a tag from the current search through an HTTP redirection.
  75      *
  76      * @param array $args Should contain `tag` key as tag to remove from current search
  77      */
  78     public function removeTag(Request $request, Response $response, array $args): Response
  79     {
  80         $referer = $this->container->environment['HTTP_REFERER'] ?? null;
  81
  82         // If the referrer is not provided, we can update the search, so we failback on the bookmark list
  83         if (empty($referer)) {
  84             return $this->redirect($response, '/');
  85         }
  86
  87         $tagToRemove = $args['tag'] ?? null;
  88         $currentUrl = parse_url($referer);
  89         parse_str($currentUrl['query'] ?? '', $params);
  90
  91         if (null === $tagToRemove) {
  92             return $response->withRedirect(($currentUrl['path'] ?? './') .'?'. http_build_query($params));
  93         }
  94
  95         // Prevent redirection loop
  96         if (isset($params['removetag'])) {
  97             unset($params['removetag']);
  98         }
  99
 100         if (isset($params['searchtags'])) {
 101             $tags = explode(' ', $params['searchtags']);
 102             // Remove value from array $tags.
 103             $tags = array_diff($tags, [$tagToRemove]);
 104             $params['searchtags'] = implode(' ', $tags);
 105
 106             if (empty($params['searchtags'])) {
 107                 unset($params['searchtags']);
 108             }
 109
 110             // We also remove page (keeping the same page has no sense, since the results are different)
 111             unset($params['page']);
 112         }
 113
 114         $queryParams = count($params) > 0 ? '?' . http_build_query($params) : '';
 115
 116         return $response->withRedirect(($currentUrl['path'] ?? './') . $queryParams);
 117     }
 118 }