refactor: general code base refactor (#2950)

* refactor

* fix: bug in previous refactor

* chore: exclude phpcompat sniff due to bug in phpcompat

* fix: do not leak absolute paths

* refactor/fix: batch extensions checking, fix DOS issue

5 files changed, 77 insertions, 84 deletions

diff --git a/formats/AtomFormat.php b/formats/AtomFormat.php
index 5f564266..c611226f 100644
--- a/formats/AtomFormat.php
+++ b/formats/AtomFormat.php
@@ -18,17 +18,21 @@ class AtomFormat extends FormatAbstract
 
     public function stringify()
     {
-        $urlPrefix = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';
-        $urlHost = (isset($_SERVER['HTTP_HOST'])) ? $_SERVER['HTTP_HOST'] : '';
-        $urlPath = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : '';
-        $urlRequest = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
+        $https = $_SERVER['HTTPS'] ?? null;
+        $urlPrefix = $https === 'on' ? 'https://' : 'http://';
+        $urlHost = $_SERVER['HTTP_HOST'] ?? '';
+        $urlRequest = $_SERVER['REQUEST_URI'] ?? '';
 
         $feedUrl = $urlPrefix . $urlHost . $urlRequest;
 
         $extraInfos = $this->getExtraInfos();
-        $uri = !empty($extraInfos['uri']) ? $extraInfos['uri'] : REPOSITORY;
+        if (empty($extraInfos['uri'])) {
+            $uri = REPOSITORY;
+        } else {
+            $uri = $extraInfos['uri'];
+        }
 
-        $document = new DomDocument('1.0', $this->getCharset());
+        $document = new \DomDocument('1.0', $this->getCharset());
         $document->formatOutput = true;
         $feed = $document->createElementNS(self::ATOM_NS, 'feed');
         $document->appendChild($feed);
@@ -44,10 +48,10 @@ class AtomFormat extends FormatAbstract
         $id->appendChild($document->createTextNode($feedUrl));
 
         $uriparts = parse_url($uri);
-        if (!empty($extraInfos['icon'])) {
-            $iconUrl = $extraInfos['icon'];
-        } else {
+        if (empty($extraInfos['icon'])) {
             $iconUrl = $uriparts['scheme'] . '://' . $uriparts['host'] . '/favicon.ico';
+        } else {
+            $iconUrl = $extraInfos['icon'];
         }
         $icon = $document->createElement('icon');
         $feed->appendChild($icon);
@@ -94,11 +98,13 @@ class AtomFormat extends FormatAbstract
                 $entryID = 'urn:sha1:' . $item->getUid();
             }
 
-            if (empty($entryID)) { // Fallback to provided URI
+            if (empty($entryID)) {
+                // Fallback to provided URI
                 $entryID = $entryUri;
             }
 
-            if (empty($entryID)) { // Fallback to title and content
+            if (empty($entryID)) {
+                // Fallback to title and content
                 $entryID = 'urn:sha1:' . hash('sha1', $entryTitle . $entryContent);
             }
 
@@ -126,7 +132,7 @@ class AtomFormat extends FormatAbstract
             $title->setAttribute('type', 'html');
             $title->appendChild($document->createTextNode($entryTitle));
 
-            $entryTimestamp = gmdate(DATE_ATOM, $entryTimestamp);
+            $entryTimestamp = gmdate(\DATE_ATOM, $entryTimestamp);
             $published = $document->createElement('published');
             $entry->appendChild($published);
             $published->appendChild($document->createTextNode($entryTimestamp));
@@ -157,14 +163,14 @@ class AtomFormat extends FormatAbstract
 
             $content = $document->createElement('content');
             $content->setAttribute('type', 'html');
-            $content->appendChild($document->createTextNode($this->sanitizeHtml($entryContent)));
+            $content->appendChild($document->createTextNode(sanitize_html($entryContent)));
             $entry->appendChild($content);
 
             foreach ($item->getEnclosures() as $enclosure) {
                 $entryEnclosure = $document->createElement('link');
                 $entry->appendChild($entryEnclosure);
                 $entryEnclosure->setAttribute('rel', 'enclosure');
-                $entryEnclosure->setAttribute('type', getMimeType($enclosure));
+                $entryEnclosure->setAttribute('type', parse_mime_type($enclosure));
                 $entryEnclosure->setAttribute('href', $enclosure);
             }
 
diff --git a/formats/HtmlFormat.php b/formats/HtmlFormat.php
index d9ab65ef..6c916de6 100644
--- a/formats/HtmlFormat.php
+++ b/formats/HtmlFormat.php
@@ -7,9 +7,9 @@ class HtmlFormat extends FormatAbstract
     public function stringify()
     {
         $extraInfos = $this->getExtraInfos();
-        $title = htmlspecialchars($extraInfos['name']);
-        $uri = htmlspecialchars($extraInfos['uri']);
-        $donationUri = htmlspecialchars($extraInfos['donationUri']);
+        $title = e($extraInfos['name']);
+        $uri = e($extraInfos['uri']);
+        $donationUri = e($extraInfos['donationUri']);
         $donationsAllowed = Configuration::getConfig('admin', 'donations');
 
         // Dynamically build buttons for all formats (except HTML)
@@ -19,32 +19,39 @@ class HtmlFormat extends FormatAbstract
         $links = '';
 
         foreach ($formatFactory->getFormatNames() as $format) {
-            if (strcasecmp($format, 'HTML') === 0) {
+            if ($format === 'Html') {
                 continue;
             }
 
-            $query = str_ireplace('format=Html', 'format=' . $format, htmlentities($_SERVER['QUERY_STRING']));
-            $buttons .= $this->buildButton($format, $query) . PHP_EOL;
+            $queryString = $_SERVER['QUERY_STRING'];
+            $query = str_ireplace('format=Html', 'format=' . $format, htmlentities($queryString));
+            $buttons .= sprintf('<a href="./?%s"><button class="rss-feed">%s</button></a>', $query, $format) . "\n";
 
             $mime = $formatFactory->create($format)->getMimeType();
-            $links .= $this->buildLink($format, $query, $mime) . PHP_EOL;
+            $links .= sprintf('<link href="./?%s" title="%s" rel="alternate" type="%s">', $query, $format, $mime) . "\n";
         }
 
         if ($donationUri !== '' && $donationsAllowed) {
-            $buttons .= '<a href="'
-                        . $donationUri
-                        . '" target="_blank"><button class="highlight">Donate to maintainer</button></a>'
-                        . PHP_EOL;
-            $links .= '<link href="'
-                        . $donationUri
-                        . ' target="_blank"" title="Donate to Maintainer" rel="alternate">'
-                        . PHP_EOL;
+            $str = sprintf(
+                '<a href="%s" target="_blank"><button class="highlight">Donate to maintainer</button></a>',
+                $donationUri
+            );
+            $buttons .= $str;
+            $str1 = sprintf(
+                '<link href="%s target="_blank"" title="Donate to Maintainer" rel="alternate">',
+                $donationUri
+            );
+            $links .= $str1;
         }
 
         $entries = '';
         foreach ($this->getItems() as $item) {
-            $entryAuthor = $item->getAuthor() ? '<br /><p class="author">by: ' . $item->getAuthor() . '</p>' : '';
-            $entryTitle = $this->sanitizeHtml(strip_tags($item->getTitle()));
+            if ($item->getAuthor()) {
+                $entryAuthor = sprintf('<br /><p class="author">by: %s</p>', $item->getAuthor());
+            } else {
+                $entryAuthor = '';
+            }
+            $entryTitle = sanitize_html(strip_tags($item->getTitle()));
             $entryUri = $item->getURI() ?: $uri;
 
             $entryDate = '';
@@ -58,9 +65,8 @@ class HtmlFormat extends FormatAbstract
 
             $entryContent = '';
             if ($item->getContent()) {
-                $entryContent = '<div class="content">'
-                . $this->sanitizeHtml($item->getContent())
-                . '</div>';
+                $str2 = sprintf('<div class="content">%s</div>', sanitize_html($item->getContent()));
+                $entryContent = $str2;
             }
 
             $entryEnclosures = '';
@@ -69,7 +75,7 @@ class HtmlFormat extends FormatAbstract
 
                 foreach ($item->getEnclosures() as $enclosure) {
                     $template = '<li class="enclosure"><a href="%s" rel="noopener noreferrer nofollow">%s</a></li>';
-                    $url = $this->sanitizeHtml($enclosure);
+                    $url = sanitize_html($enclosure);
                     $anchorText = substr($url, strrpos($url, '/') + 1);
 
                     $entryEnclosures .= sprintf($template, $url, $anchorText);
@@ -84,7 +90,7 @@ class HtmlFormat extends FormatAbstract
 
                 foreach ($item->getCategories() as $category) {
                     $entryCategories .= '<li class="category">'
-                    . $this->sanitizeHtml($category)
+                    . sanitize_html($category)
                     . '</li>';
                 }
 
@@ -106,8 +112,6 @@ EOD;
         }
 
         $charset = $this->getCharset();
-
-        /* Data are prepared, now let's begin the "MAGIE !!!" */
         $toReturn = <<<EOD
 <!DOCTYPE html>
 <html>
@@ -136,19 +140,4 @@ EOD;
         $toReturn = mb_convert_encoding($toReturn, $this->getCharset(), 'UTF-8');
         return $toReturn;
     }
-
-    private function buildButton($format, $query)
-    {
-        return <<<EOD
-<a href="./?{$query}"><button class="rss-feed">{$format}</button></a>
-EOD;
-    }
-
-    private function buildLink($format, $query, $mime)
-    {
-        return <<<EOD
-<link href="./?{$query}" title="{$format}" rel="alternate" type="{$mime}">
-
-EOD;
-    }
 }
diff --git a/formats/JsonFormat.php b/formats/JsonFormat.php
index 3b2a29ab..bb9e81a2 100644
--- a/formats/JsonFormat.php
+++ b/formats/JsonFormat.php
@@ -25,10 +25,10 @@ class JsonFormat extends FormatAbstract
 
     public function stringify()
     {
-        $urlPrefix = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';
-        $urlHost = (isset($_SERVER['HTTP_HOST'])) ? $_SERVER['HTTP_HOST'] : '';
-        $urlPath = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : '';
-        $urlRequest = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
+        $https = $_SERVER['HTTPS'] ?? null;
+        $urlPrefix = $https === 'on' ? 'https://' : 'http://';
+        $urlHost = $_SERVER['HTTP_HOST'] ?? '';
+        $urlRequest = $_SERVER['REQUEST_URI'] ?? '';
 
         $extraInfos = $this->getExtraInfos();
 
@@ -52,7 +52,7 @@ class JsonFormat extends FormatAbstract
             $entryTitle = $item->getTitle();
             $entryUri = $item->getURI();
             $entryTimestamp = $item->getTimestamp();
-            $entryContent = $item->getContent() ? $this->sanitizeHtml($item->getContent()) : '';
+            $entryContent = $item->getContent() ? sanitize_html($item->getContent()) : '';
             $entryEnclosures = $item->getEnclosures();
             $entryCategories = $item->getCategories();
 
@@ -76,13 +76,13 @@ class JsonFormat extends FormatAbstract
                 ];
             }
             if (!empty($entryTimestamp)) {
-                $entry['date_modified'] = gmdate(DATE_ATOM, $entryTimestamp);
+                $entry['date_modified'] = gmdate(\DATE_ATOM, $entryTimestamp);
             }
             if (!empty($entryUri)) {
                 $entry['url'] = $entryUri;
             }
             if (!empty($entryContent)) {
-                if ($this->isHTML($entryContent)) {
+                if (is_html($entryContent)) {
                     $entry['content_html'] = $entryContent;
                 } else {
                     $entry['content_text'] = $entryContent;
@@ -93,7 +93,7 @@ class JsonFormat extends FormatAbstract
                 foreach ($entryEnclosures as $enclosure) {
                     $entry['attachments'][] = [
                         'url' => $enclosure,
-                        'mime_type' => getMimeType($enclosure)
+                        'mime_type' => parse_mime_type($enclosure)
                     ];
                 }
             }
@@ -121,13 +121,8 @@ class JsonFormat extends FormatAbstract
          * So consider this a hack.
          * Switch to JSON_INVALID_UTF8_IGNORE when PHP 7.2 is the latest platform requirement.
          */
-        $json = json_encode($data, JSON_PRETTY_PRINT | JSON_PARTIAL_OUTPUT_ON_ERROR);
+        $json = json_encode($data, \JSON_PRETTY_PRINT | \JSON_PARTIAL_OUTPUT_ON_ERROR);
 
         return $json;
     }
-
-    private function isHTML($text)
-    {
-        return (strlen(strip_tags($text)) != strlen($text));
-    }
 }
diff --git a/formats/MrssFormat.php b/formats/MrssFormat.php
index 45c2181f..f4067b73 100644
--- a/formats/MrssFormat.php
+++ b/formats/MrssFormat.php
@@ -33,22 +33,28 @@ class MrssFormat extends FormatAbstract
     protected const MRSS_NS = 'http://search.yahoo.com/mrss/';
 
     const ALLOWED_IMAGE_EXT = [
-        '.gif', '.jpg', '.png'
+        '.gif',
+        '.jpg',
+        '.png',
     ];
 
     public function stringify()
     {
-        $urlPrefix = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://';
-        $urlHost = (isset($_SERVER['HTTP_HOST'])) ? $_SERVER['HTTP_HOST'] : '';
-        $urlPath = (isset($_SERVER['PATH_INFO'])) ? $_SERVER['PATH_INFO'] : '';
-        $urlRequest = (isset($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : '';
+        $https = $_SERVER['HTTPS'] ?? null;
+        $urlPrefix = $https == 'on' ? 'https://' : 'http://';
+        $urlHost = $_SERVER['HTTP_HOST'] ?? '';
+        $urlRequest = $_SERVER['REQUEST_URI'] ?? '';
 
         $feedUrl = $urlPrefix . $urlHost . $urlRequest;
 
         $extraInfos = $this->getExtraInfos();
-        $uri = !empty($extraInfos['uri']) ? $extraInfos['uri'] : REPOSITORY;
+        if (empty($extraInfos['uri'])) {
+            $uri = REPOSITORY;
+        } else {
+            $uri = $extraInfos['uri'];
+        }
 
-        $document = new DomDocument('1.0', $this->getCharset());
+        $document = new \DomDocument('1.0', $this->getCharset());
         $document->formatOutput = true;
         $feed = $document->createElement('rss');
         $document->appendChild($feed);
@@ -103,16 +109,18 @@ class MrssFormat extends FormatAbstract
             $itemTimestamp = $item->getTimestamp();
             $itemTitle = $item->getTitle();
             $itemUri = $item->getURI();
-            $itemContent = $item->getContent() ? $this->sanitizeHtml($item->getContent()) : '';
+            $itemContent = $item->getContent() ? sanitize_html($item->getContent()) : '';
             $entryID = $item->getUid();
             $isPermaLink = 'false';
 
-            if (empty($entryID) && !empty($itemUri)) { // Fallback to provided URI
+            if (empty($entryID) && !empty($itemUri)) {
+                // Fallback to provided URI
                 $entryID = $itemUri;
                 $isPermaLink = 'true';
             }
 
-            if (empty($entryID)) { // Fallback to title and content
+            if (empty($entryID)) {
+                // Fallback to title and content
                 $entryID = hash('sha1', $itemTitle . $itemContent);
             }
 
@@ -139,7 +147,7 @@ class MrssFormat extends FormatAbstract
             if (!empty($itemTimestamp)) {
                 $entryPublished = $document->createElement('pubDate');
                 $entry->appendChild($entryPublished);
-                $entryPublished->appendChild($document->createTextNode(gmdate(DATE_RFC2822, $itemTimestamp)));
+                $entryPublished->appendChild($document->createTextNode(gmdate(\DATE_RFC2822, $itemTimestamp)));
             }
 
             if (!empty($itemContent)) {
@@ -152,10 +160,9 @@ class MrssFormat extends FormatAbstract
                 $entryEnclosure = $document->createElementNS(self::MRSS_NS, 'content');
                 $entry->appendChild($entryEnclosure);
                 $entryEnclosure->setAttribute('url', $enclosure);
-                $entryEnclosure->setAttribute('type', getMimeType($enclosure));
+                $entryEnclosure->setAttribute('type', parse_mime_type($enclosure));
             }
 
-            $entryCategories = '';
             foreach ($item->getCategories() as $category) {
                 $entryCategory = $document->createElement('category');
                 $entry->appendChild($entryCategory);
diff --git a/formats/PlaintextFormat.php b/formats/PlaintextFormat.php
index a1e125c7..c8c4e9d6 100644
--- a/formats/PlaintextFormat.php
+++ b/formats/PlaintextFormat.php
@@ -1,9 +1,5 @@
 <?php
 
-/**
-* Plaintext
-* Returns $this->items as raw php data.
-*/
 class PlaintextFormat extends FormatAbstract
 {
     const MIME_TYPE = 'text/plain';