5 files changed, 600 insertions, 0 deletions

diff --git a/application/formatter/BookmarkDefaultFormatter.php b/application/formatter/BookmarkDefaultFormatter.php
new file mode 100644
index 00000000..7550c556
--- /dev/null
+++ b/application/formatter/BookmarkDefaultFormatter.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+/**
+ * Class BookmarkDefaultFormatter
+ *
+ * Default bookmark formatter.
+ * Escape values for HTML display and automatically add link to URL and hashtags.
+ *
+ * @package Shaarli\Formatter
+ */
+class BookmarkDefaultFormatter extends BookmarkFormatter
+{
+    /**
+     * @inheritdoc
+     */
+    public function formatTitle($bookmark)
+    {
+        return escape($bookmark->getTitle());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatDescription($bookmark)
+    {
+        $indexUrl = ! empty($this->contextData['index_url']) ? $this->contextData['index_url'] : '';
+        return format_description(escape($bookmark->getDescription()), $indexUrl);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function formatTagList($bookmark)
+    {
+        return escape($bookmark->getTags());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatTagString($bookmark)
+    {
+        return implode(' ', $this->formatTagList($bookmark));
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatUrl($bookmark)
+    {
+        if (! empty($this->contextData['index_url']) && (
+            startsWith($bookmark->getUrl(), '?') || startsWith($bookmark->getUrl(), '/')
+        )) {
+            return $this->contextData['index_url'] . escape($bookmark->getUrl());
+        }
+        return escape($bookmark->getUrl());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function formatRealUrl($bookmark)
+    {
+        if (! empty($this->contextData['index_url']) && (
+                startsWith($bookmark->getUrl(), '?') || startsWith($bookmark->getUrl(), '/')
+            )) {
+            return $this->contextData['index_url'] . escape($bookmark->getUrl());
+        }
+        return escape($bookmark->getUrl());
+    }
+
+    /**
+     * @inheritdoc
+     */
+    protected function formatThumbnail($bookmark)
+    {
+        return escape($bookmark->getThumbnail());
+    }
+}
diff --git a/application/formatter/BookmarkFormatter.php b/application/formatter/BookmarkFormatter.php
new file mode 100644
index 00000000..c82c3452
--- /dev/null
+++ b/application/formatter/BookmarkFormatter.php
@@ -0,0 +1,256 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+use DateTime;
+use Shaarli\Config\ConfigManager;
+use Shaarli\Bookmark\Bookmark;
+
+/**
+ * Class BookmarkFormatter
+ *
+ * Abstract class processing all bookmark attributes through methods designed to be overridden.
+ *
+ * @package Shaarli\Formatter
+ */
+abstract class BookmarkFormatter
+{
+    /**
+     * @var ConfigManager
+     */
+    protected $conf;
+
+    /**
+     * @var array Additional parameters than can be used for specific formatting
+     *            e.g. index_url for Feed formatting
+     */
+    protected $contextData = [];
+
+    /**
+     * LinkDefaultFormatter constructor.
+     * @param ConfigManager $conf
+     */
+    public function __construct(ConfigManager $conf)
+    {
+        $this->conf = $conf;
+    }
+
+    /**
+     * Convert a Bookmark into an array usable by templates and plugins.
+     *
+     * All Bookmark attributes are formatted through a format method
+     * that can be overridden in a formatter extending this class.
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return array formatted representation of a Bookmark
+     */
+    public function format($bookmark)
+    {
+        $out['id'] = $this->formatId($bookmark);
+        $out['shorturl'] = $this->formatShortUrl($bookmark);
+        $out['url'] = $this->formatUrl($bookmark);
+        $out['real_url'] = $this->formatRealUrl($bookmark);
+        $out['title'] = $this->formatTitle($bookmark);
+        $out['description'] = $this->formatDescription($bookmark);
+        $out['thumbnail'] = $this->formatThumbnail($bookmark);
+        $out['taglist'] = $this->formatTagList($bookmark);
+        $out['tags'] = $this->formatTagString($bookmark);
+        $out['sticky'] = $bookmark->isSticky();
+        $out['private'] = $bookmark->isPrivate();
+        $out['class'] = $this->formatClass($bookmark);
+        $out['created'] = $this->formatCreated($bookmark);
+        $out['updated'] = $this->formatUpdated($bookmark);
+        $out['timestamp'] = $this->formatCreatedTimestamp($bookmark);
+        $out['updated_timestamp'] = $this->formatUpdatedTimestamp($bookmark);
+        return $out;
+    }
+
+    /**
+     * Add additional data available to formatters.
+     * This is used for example to add `index_url` in description's links.
+     *
+     * @param string $key   Context data key
+     * @param string $value Context data value
+     */
+    public function addContextData($key, $value)
+    {
+        $this->contextData[$key] = $value;
+    }
+
+    /**
+     * Format ID
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return int formatted ID
+     */
+    protected function formatId($bookmark)
+    {
+        return $bookmark->getId();
+    }
+
+    /**
+     * Format ShortUrl
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted ShortUrl
+     */
+    protected function formatShortUrl($bookmark)
+    {
+        return $bookmark->getShortUrl();
+    }
+
+    /**
+     * Format Url
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Url
+     */
+    protected function formatUrl($bookmark)
+    {
+        return $bookmark->getUrl();
+    }
+
+    /**
+     * Format RealUrl
+     * Legacy: identical to Url
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted RealUrl
+     */
+    protected function formatRealUrl($bookmark)
+    {
+        return $bookmark->getUrl();
+    }
+
+    /**
+     * Format Title
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Title
+     */
+    protected function formatTitle($bookmark)
+    {
+        return $bookmark->getTitle();
+    }
+
+    /**
+     * Format Description
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Description
+     */
+    protected function formatDescription($bookmark)
+    {
+        return $bookmark->getDescription();
+    }
+
+    /**
+     * Format Thumbnail
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Thumbnail
+     */
+    protected function formatThumbnail($bookmark)
+    {
+        return $bookmark->getThumbnail();
+    }
+
+    /**
+     * Format Tags
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return array formatted Tags
+     */
+    protected function formatTagList($bookmark)
+    {
+        return $bookmark->getTags();
+    }
+
+    /**
+     * Format TagString
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted TagString
+     */
+    protected function formatTagString($bookmark)
+    {
+        return implode(' ', $bookmark->getTags());
+    }
+
+    /**
+     * Format Class
+     * Used to add specific CSS class for a link
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return string formatted Class
+     */
+    protected function formatClass($bookmark)
+    {
+        return $bookmark->isPrivate() ? 'private' : '';
+    }
+
+    /**
+     * Format Created
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return DateTime instance
+     */
+    protected function formatCreated(Bookmark $bookmark)
+    {
+        return $bookmark->getCreated();
+    }
+
+    /**
+     * Format Updated
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return DateTime instance
+     */
+    protected function formatUpdated(Bookmark $bookmark)
+    {
+        return $bookmark->getUpdated();
+    }
+
+    /**
+     * Format CreatedTimestamp
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return int formatted CreatedTimestamp
+     */
+    protected function formatCreatedTimestamp(Bookmark $bookmark)
+    {
+        if (! empty($bookmark->getCreated())) {
+            return $bookmark->getCreated()->getTimestamp();
+        }
+        return 0;
+    }
+
+    /**
+     * Format UpdatedTimestamp
+     *
+     * @param Bookmark $bookmark instance
+     *
+     * @return int formatted UpdatedTimestamp
+     */
+    protected function formatUpdatedTimestamp(Bookmark $bookmark)
+    {
+        if (! empty($bookmark->getUpdated())) {
+            return $bookmark->getUpdated()->getTimestamp();
+        }
+        return 0;
+    }
+}
diff --git a/application/formatter/BookmarkMarkdownFormatter.php b/application/formatter/BookmarkMarkdownFormatter.php
new file mode 100644
index 00000000..7797bfbf
--- /dev/null
+++ b/application/formatter/BookmarkMarkdownFormatter.php
@@ -0,0 +1,204 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+use Shaarli\Config\ConfigManager;
+
+/**
+ * Class BookmarkMarkdownFormatter
+ *
+ * Format bookmark description into Markdown format.
+ *
+ * @package Shaarli\Formatter
+ */
+class BookmarkMarkdownFormatter extends BookmarkDefaultFormatter
+{
+    /**
+     * When this tag is present in a bookmark, its description should not be processed with Markdown
+     */
+    const NO_MD_TAG = 'nomarkdown';
+
+    /** @var \Parsedown instance */
+    protected $parsedown;
+
+    /** @var bool used to escape HTML in Markdown or not.
+     *            It MUST be set to true for shared instance as HTML content can
+     *            introduce XSS vulnerabilities.
+     */
+    protected $escape;
+
+    /**
+     * @var array List of allowed protocols for links inside bookmark's description.
+     */
+    protected $allowedProtocols;
+
+    /**
+     * LinkMarkdownFormatter constructor.
+     *
+     * @param ConfigManager $conf instance
+     */
+    public function __construct(ConfigManager $conf)
+    {
+        parent::__construct($conf);
+        $this->parsedown = new \Parsedown();
+        $this->escape = $conf->get('security.markdown_escape', true);
+        $this->allowedProtocols = $conf->get('security.allowed_protocols', []);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function formatDescription($bookmark)
+    {
+        if (in_array(self::NO_MD_TAG, $bookmark->getTags())) {
+            return parent::formatDescription($bookmark);
+        }
+
+        $processedDescription = $bookmark->getDescription();
+        $processedDescription = $this->filterProtocols($processedDescription);
+        $processedDescription = $this->formatHashTags($processedDescription);
+        $processedDescription = $this->reverseEscapedHtml($processedDescription);
+        $processedDescription = $this->parsedown
+            ->setMarkupEscaped($this->escape)
+            ->setBreaksEnabled(true)
+            ->text($processedDescription);
+        $processedDescription = $this->sanitizeHtml($processedDescription);
+
+        if (!empty($processedDescription)) {
+            $processedDescription = '<div class="markdown">'. $processedDescription . '</div>';
+        }
+
+        return $processedDescription;
+    }
+
+    /**
+     * Remove the NO markdown tag if it is present
+     *
+     * @inheritdoc
+     */
+    protected function formatTagList($bookmark)
+    {
+        $out = parent::formatTagList($bookmark);
+        if (($pos = array_search(self::NO_MD_TAG, $out)) !== false) {
+            unset($out[$pos]);
+            return array_values($out);
+        }
+        return $out;
+    }
+
+    /**
+     * Replace not whitelisted protocols with http:// in given description.
+     * Also adds `index_url` to relative links if it's specified
+     *
+     * @param string $description      input description text.
+     *
+     * @return string $description without malicious link.
+     */
+    protected function filterProtocols($description)
+    {
+        $allowedProtocols = $this->allowedProtocols;
+        $indexUrl = ! empty($this->contextData['index_url']) ? $this->contextData['index_url'] : '';
+
+        return preg_replace_callback(
+            '#]\((.*?)\)#is',
+            function ($match) use ($allowedProtocols, $indexUrl) {
+                $link = startsWith($match[1], '?') || startsWith($match[1], '/') ? $indexUrl : '';
+                $link .= whitelist_protocols($match[1], $allowedProtocols);
+                return ']('. $link.')';
+            },
+            $description
+        );
+    }
+
+    /**
+     * Replace hashtag in Markdown links format
+     * E.g. `#hashtag` becomes `[#hashtag](?addtag=hashtag)`
+     * It includes the index URL if specified.
+     *
+     * @param string $description
+     *
+     * @return string
+     */
+    protected function formatHashTags($description)
+    {
+        $indexUrl = ! empty($this->contextData['index_url']) ? $this->contextData['index_url'] : '';
+
+        /*
+         * To support unicode: http://stackoverflow.com/a/35498078/1484919
+         * \p{Pc} - to match underscore
+         * \p{N} - numeric character in any script
+         * \p{L} - letter from any language
+         * \p{Mn} - any non marking space (accents, umlauts, etc)
+         */
+        $regex = '/(^|\s)#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/mui';
+        $replacement = '$1[#$2]('. $indexUrl .'?addtag=$2)';
+
+        $descriptionLines = explode(PHP_EOL, $description);
+        $descriptionOut = '';
+        $codeBlockOn = false;
+        $lineCount = 0;
+
+        foreach ($descriptionLines as $descriptionLine) {
+            // Detect line of code: starting with 4 spaces,
+            // except lists which can start with +/*/- or `2.` after spaces.
+            $codeLineOn = preg_match('/^    +(?=[^\+\*\-])(?=(?!\d\.).)/', $descriptionLine) > 0;
+            // Detect and toggle block of code
+            if (!$codeBlockOn) {
+                $codeBlockOn = preg_match('/^```/', $descriptionLine) > 0;
+            } elseif (preg_match('/^```/', $descriptionLine) > 0) {
+                $codeBlockOn = false;
+            }
+
+            if (!$codeBlockOn && !$codeLineOn) {
+                $descriptionLine = preg_replace($regex, $replacement, $descriptionLine);
+            }
+
+            $descriptionOut .= $descriptionLine;
+            if ($lineCount++ < count($descriptionLines) - 1) {
+                $descriptionOut .= PHP_EOL;
+            }
+        }
+
+        return $descriptionOut;
+    }
+
+    /**
+     * Remove dangerous HTML tags (tags, iframe, etc.).
+     * Doesn't affect <code> content (already escaped by Parsedown).
+     *
+     * @param string $description input description text.
+     *
+     * @return string given string escaped.
+     */
+    protected function sanitizeHtml($description)
+    {
+        $escapeTags = array(
+            'script',
+            'style',
+            'link',
+            'iframe',
+            'frameset',
+            'frame',
+        );
+        foreach ($escapeTags as $tag) {
+            $description = preg_replace_callback(
+                '#<\s*'. $tag .'[^>]*>(.*</\s*'. $tag .'[^>]*>)?#is',
+                function ($match) {
+                    return escape($match[0]);
+                },
+                $description
+            );
+        }
+        $description = preg_replace(
+            '#(<[^>]+\s)on[a-z]*="?[^ "]*"?#is',
+            '$1',
+            $description
+        );
+        return $description;
+    }
+
+    protected function reverseEscapedHtml($description)
+    {
+        return unescape($description);
+    }
+}
diff --git a/application/formatter/BookmarkRawFormatter.php b/application/formatter/BookmarkRawFormatter.php
new file mode 100644
index 00000000..bc372273
--- /dev/null
+++ b/application/formatter/BookmarkRawFormatter.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+/**
+ * Class BookmarkRawFormatter
+ *
+ * Used to retrieve bookmarks as array with raw values.
+ * Warning: Do NOT use this for HTML content as it can introduce XSS vulnerabilities.
+ *
+ * @package Shaarli\Formatter
+ */
+class BookmarkRawFormatter extends BookmarkFormatter {}
diff --git a/application/formatter/FormatterFactory.php b/application/formatter/FormatterFactory.php
new file mode 100644
index 00000000..0d2c0466
--- /dev/null
+++ b/application/formatter/FormatterFactory.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Shaarli\Formatter;
+
+use Shaarli\Config\ConfigManager;
+
+/**
+ * Class FormatterFactory
+ *
+ * Helper class used to instantiate the proper BookmarkFormatter.
+ *
+ * @package Shaarli\Formatter
+ */
+class FormatterFactory
+{
+    /** @var ConfigManager instance */
+    protected $conf;
+
+    /**
+     * FormatterFactory constructor.
+     *
+     * @param ConfigManager $conf
+     */
+    public function __construct(ConfigManager $conf)
+    {
+        $this->conf = $conf;
+    }
+
+    /**
+     * Instanciate a BookmarkFormatter depending on the configuration or provided formatter type.
+     *
+     * @param string|null $type force a specific type regardless of the configuration
+     *
+     * @return BookmarkFormatter instance.
+     */
+    public function getFormatter($type = null)
+    {
+        $type = $type ? $type : $this->conf->get('formatter', 'default');
+        $className = '\\Shaarli\\Formatter\\Bookmark'. ucfirst($type) .'Formatter';
+        if (!class_exists($className)) {
+            $className = '\\Shaarli\\Formatter\\BookmarkDefaultFormatter';
+        }
+
+        return new $className($this->conf);
+    }
+}