Merge pull request #1205 from ArthurHoaro/feature/opengraph

[github/shaarli/Shaarli.git] / plugins / markdown / markdown.php

diff --git a/plugins/markdown/markdown.php b/plugins/markdown/markdown.php
index de7c823dfa4731c9d71a593db3f2a1530fb41d25..08e64dae087e1a9828bd23d8c0f54680c485e263 100644 (file)
--- a/plugins/markdown/markdown.php
+++ b/plugins/markdown/markdown.php
@@ -6,6 +6,8 @@
  * Shaare's descriptions are parsed with Markdown.
  */
 
+use Shaarli\Config\ConfigManager;
+
 /*
  * If this tag is used on a shaare, the description won't be processed by Parsedown.
  */
@@ -26,7 +28,12 @@ function hook_markdown_render_linklist($data, $conf)
             $value = stripNoMarkdownTag($value);
             continue;
         }
-        $value['description'] = process_markdown($value['description'], $conf->get('security.markdown_escape', true));
+        $value['description_src'] = $value['description'];
+        $value['description'] = process_markdown(
+            $value['description'],
+            $conf->get('security.markdown_escape', true),
+            $conf->get('security.allowed_protocols')
+        );
     }
     return $data;
 }
@@ -46,7 +53,12 @@ function hook_markdown_render_feed($data, $conf)
             $value = stripNoMarkdownTag($value);
             continue;
         }
-        $value['description'] = process_markdown($value['description'], $conf->get('security.markdown_escape', true));
+        $value['description'] = reverse_feed_permalink($value['description']);
+        $value['description'] = process_markdown(
+            $value['description'],
+            $conf->get('security.markdown_escape', true),
+            $conf->get('security.allowed_protocols')
+        );
     }
 
     return $data;
@@ -62,18 +74,18 @@ function hook_markdown_render_feed($data, $conf)
  */
 function hook_markdown_render_daily($data, $conf)
 {
+    //var_dump($data);die;
     // Manipulate columns data
-    foreach ($data['cols'] as &$value) {
-        foreach ($value as &$value2) {
-            if (!empty($value2['tags']) && noMarkdownTag($value2['tags'])) {
-                $value2 = stripNoMarkdownTag($value2);
-                continue;
-            }
-            $value2['formatedDescription'] = process_markdown(
-                $value2['formatedDescription'],
-                $conf->get('security.markdown_escape', true)
-            );
+    foreach ($data['linksToDisplay'] as &$value) {
+        if (!empty($value['tags']) && noMarkdownTag($value['tags'])) {
+            $value = stripNoMarkdownTag($value);
+            continue;
         }
+        $value['formatedDescription'] = process_markdown(
+            $value['formatedDescription'],
+            $conf->get('security.markdown_escape', true),
+            $conf->get('security.allowed_protocols')
+        );
     }
 
     return $data;
@@ -127,7 +139,7 @@ function hook_markdown_render_includes($data)
         || $data['_PAGE_'] == Router::$PAGE_DAILY
         || $data['_PAGE_'] == Router::$PAGE_EDITLINK
     ) {
-        
+
         $data['css_files'][] = PluginManager::$PLUGINS_PATH . '/markdown/markdown.css';
     }
 
@@ -145,8 +157,13 @@ function hook_markdown_render_includes($data)
 function hook_markdown_render_editlink($data)
 {
     // Load help HTML into a string
-    $data['edit_link_plugin'][] = file_get_contents(PluginManager::$PLUGINS_PATH .'/markdown/help.html');
-
+    $txt = file_get_contents(PluginManager::$PLUGINS_PATH .'/markdown/help.html');
+    $translations = [
+        t('Description will be rendered with'),
+        t('Markdown syntax documentation'),
+        t('Markdown syntax'),
+    ];
+    $data['edit_link_plugin'][] = vsprintf($txt, $translations);
     // Add no markdown 'meta-tag' in tag list if it was never used, for autocompletion.
     if (! in_array(NO_MD_TAG, $data['tags'])) {
         $data['tags'][NO_MD_TAG] = 0;
@@ -199,6 +216,15 @@ function reverse_text2clickable($description)
             $descriptionLine
         );
 
+        // Make hashtag links markdown ready, otherwise the links will be ignored with escape set to true
+        if (!$codeBlockOn && !$codeLineOn) {
+            $descriptionLine = preg_replace(
+                '#<a href="([^ ]*)"'. $hashtagTitle .'>([^<]+)</a>#m',
+                '[$2]($1)',
+                $descriptionLine
+            );
+        }
+
         $descriptionOut .= $descriptionLine;
         if ($lineCount++ < count($descriptionLines) - 1) {
             $descriptionOut .= PHP_EOL;
@@ -231,6 +257,30 @@ function reverse_space2nbsp($description)
     return preg_replace('/(^| )&nbsp;/m', '$1 ', $description);
 }
 
+function reverse_feed_permalink($description)
+{
+    return preg_replace('@&#8212; <a href="([^"]+)" title="[^"]+">(\w+)</a>$@im', '&#8212; [$2]($1)', $description);
+}
+
+/**
+ * Replace not whitelisted protocols with http:// in given description.
+ *
+ * @param string $description      input description text.
+ * @param array  $allowedProtocols list of allowed protocols.
+ *
+ * @return string $description without malicious link.
+ */
+function filter_protocols($description, $allowedProtocols)
+{
+    return preg_replace_callback(
+        '#]\((.*?)\)#is',
+        function ($match) use ($allowedProtocols) {
+            return ']('. whitelist_protocols($match[1], $allowedProtocols) .')';
+        },
+        $description
+    );
+}
+
 /**
  * Remove dangerous HTML tags (tags, iframe, etc.).
  * Doesn't affect <code> content (already escaped by Parsedown).
@@ -256,7 +306,7 @@ function sanitize_html($description)
             $description);
     }
     $description = preg_replace(
-        '#(<[^>]+)on[a-z]*="?[^ "]*"?#is',
+        '#(<[^>]+\s)on[a-z]*="?[^ "]*"?#is',
         '$1',
         $description);
     return $description;
@@ -275,7 +325,7 @@ function sanitize_html($description)
  *
  * @return string HTML processed $description.
  */
-function process_markdown($description, $escape = true)
+function process_markdown($description, $escape = true, $allowedProtocols = [])
 {
     $parsedown = new Parsedown();
 
@@ -283,6 +333,7 @@ function process_markdown($description, $escape = true)
     $processedDescription = reverse_nl2br($processedDescription);
     $processedDescription = reverse_space2nbsp($processedDescription);
     $processedDescription = reverse_text2clickable($processedDescription);
+    $processedDescription = filter_protocols($processedDescription, $allowedProtocols);
     $processedDescription = unescape($processedDescription);
     $processedDescription = $parsedown
         ->setMarkupEscaped($escape)
@@ -296,3 +347,15 @@ function process_markdown($description, $escape = true)
 
     return $processedDescription;
 }
+
+/**
+ * This function is never called, but contains translation calls for GNU gettext extraction.
+ */
+function markdown_dummy_translation()
+{
+    // meta
+    t('Render shaare description with Markdown syntax.<br><strong>Warning</strong>:
+If your shaared descriptions contained HTML tags before enabling the markdown plugin,
+enabling it might break your page.
+See the <a href="https://github.com/shaarli/Shaarli/tree/master/plugins/markdown#html-rendering">README</a>.');
+}