7 files changed, 378 insertions, 13 deletions

diff --git a/application/FeedBuilder.php b/application/FeedBuilder.php
new file mode 100644
index 00000000..ddefe6ce
--- /dev/null
+++ b/application/FeedBuilder.php
@@ -0,0 +1,279 @@
+<?php
+
+/**
+ * FeedBuilder class.
+ *
+ * Used to build ATOM and RSS feeds data.
+ */
+class FeedBuilder
+{
+    /**
+     * @var string Constant: RSS feed type.
+     */
+    public static $FEED_RSS = 'rss';
+
+    /**
+     * @var string Constant: ATOM feed type.
+     */
+    public static $FEED_ATOM = 'atom';
+
+    /**
+     * @var string Default language if the locale isn't set.
+     */
+    public static $DEFAULT_LANGUAGE = 'en-en';
+
+    /**
+     * @var int Number of links to display in a feed by default.
+     */
+    public static $DEFAULT_NB_LINKS = 50;
+
+    /**
+     * @var LinkDB instance.
+     */
+    protected $linkDB;
+
+    /**
+     * @var string RSS or ATOM feed.
+     */
+    protected $feedType;
+
+    /**
+     * @var array $_SERVER.
+     */
+    protected $serverInfo;
+
+    /**
+     * @var array $_GET.
+     */
+    protected $userInput;
+
+    /**
+     * @var boolean True if the user is currently logged in, false otherwise.
+     */
+    protected $isLoggedIn;
+
+    /**
+     * @var boolean Use permalinks instead of direct links if true.
+     */
+    protected $usePermalinks;
+
+    /**
+     * @var boolean true to hide dates in feeds.
+     */
+    protected $hideDates;
+
+    /**
+     * @var string PubSub hub URL.
+     */
+    protected $pubsubhubUrl;
+
+    /**
+     * @var string server locale.
+     */
+    protected $locale;
+
+    /**
+     * @var DateTime Latest item date.
+     */
+    protected $latestDate;
+
+    /**
+     * Feed constructor.
+     *
+     * @param LinkDB  $linkDB        LinkDB instance.
+     * @param string  $feedType      Type of feed.
+     * @param array   $serverInfo    $_SERVER.
+     * @param array   $userInput     $_GET.
+     * @param boolean $isLoggedIn True if the user is currently logged in, false otherwise.
+     */
+    public function __construct($linkDB, $feedType, $serverInfo, $userInput, $isLoggedIn)
+    {
+        $this->linkDB = $linkDB;
+        $this->feedType = $feedType;
+        $this->serverInfo = $serverInfo;
+        $this->userInput = $userInput;
+        $this->isLoggedIn = $isLoggedIn;
+    }
+
+    /**
+     * Build data for feed templates.
+     *
+     * @return array Formatted data for feeds templates.
+     */
+    public function buildData()
+    {
+        // Optionally filter the results:
+        $linksToDisplay = $this->linkDB->filterSearch($this->userInput);
+
+        $nblinksToDisplay = $this->getNbLinks(count($linksToDisplay));
+
+        // Can't use array_keys() because $link is a LinkDB instance and not a real array.
+        $keys = array();
+        foreach ($linksToDisplay as $key => $value) {
+            $keys[] = $key;
+        }
+
+        $pageaddr = escape(index_url($this->serverInfo));
+        $linkDisplayed = array();
+        for ($i = 0; $i < $nblinksToDisplay && $i < count($keys); $i++) {
+            $linkDisplayed[$keys[$i]] = $this->buildItem($linksToDisplay[$keys[$i]], $pageaddr);
+        }
+
+        $data['language'] = $this->getTypeLanguage();
+        $data['pubsubhub_url'] = $this->pubsubhubUrl;
+        $data['last_update'] = $this->getLatestDateFormatted();
+        $data['show_dates'] = !$this->hideDates || $this->isLoggedIn;
+        // Remove leading slash from REQUEST_URI.
+        $data['self_link'] = $pageaddr . escape(ltrim($this->serverInfo['REQUEST_URI'], '/'));
+        $data['index_url'] = $pageaddr;
+        $data['usepermalinks'] = $this->usePermalinks === true;
+        $data['links'] = $linkDisplayed;
+
+        return $data;
+    }
+
+    /**
+     * Build a feed item (one per shaare).
+     *
+     * @param array  $link     Single link array extracted from LinkDB.
+     * @param string $pageaddr Index URL.
+     *
+     * @return array Link array with feed attributes.
+     */
+    protected function buildItem($link, $pageaddr)
+    {
+        $link['guid'] = $pageaddr .'?'. smallHash($link['linkdate']);
+        // Check for both signs of a note: starting with ? and 7 chars long.
+        if ($link['url'][0] === '?' && strlen($link['url']) === 7) {
+            $link['url'] = $pageaddr . $link['url'];
+        }
+        if ($this->usePermalinks === true) {
+            $permalink = '<a href="'. $link['url'] .'" title="Direct link">Direct link</a>';
+        } else {
+            $permalink = '<a href="'. $link['guid'] .'" title="Permalink">Permalink</a>';
+        }
+        $link['description'] = format_description($link['description']) . PHP_EOL .'<br>&#8212; '. $permalink;
+
+        $date = DateTime::createFromFormat(LinkDB::LINK_DATE_FORMAT, $link['linkdate']);
+
+        if ($this->feedType == self::$FEED_RSS) {
+            $link['iso_date'] = $date->format(DateTime::RSS);
+        } else {
+            $link['iso_date'] = $date->format(DateTime::ATOM);
+        }
+
+        // Save the more recent item.
+        if (empty($this->latestDate) || $this->latestDate < $date) {
+            $this->latestDate = $date;
+        }
+
+        $taglist = array_filter(explode(' ', $link['tags']), 'strlen');
+        uasort($taglist, 'strcasecmp');
+        $link['taglist'] = $taglist;
+
+        return $link;
+    }
+
+    /**
+     * Assign PubSub hub URL.
+     *
+     * @param string $pubsubhubUrl PubSub hub url.
+     */
+    public function setPubsubhubUrl($pubsubhubUrl)
+    {
+        $this->pubsubhubUrl = $pubsubhubUrl;
+    }
+
+    /**
+     * Set this to true to use permalinks instead of direct links.
+     *
+     * @param boolean $usePermalinks true to force permalinks.
+     */
+    public function setUsePermalinks($usePermalinks)
+    {
+        $this->usePermalinks = $usePermalinks;
+    }
+
+    /**
+     * Set this to true to hide timestamps in feeds.
+     *
+     * @param boolean $hideDates true to enable.
+     */
+    public function setHideDates($hideDates)
+    {
+        $this->hideDates = $hideDates;
+    }
+
+    /**
+     * Set the locale. Used to show feed language.
+     *
+     * @param string $locale The locale (eg. 'fr_FR.UTF8').
+     */
+    public function setLocale($locale)
+    {
+        $this->locale = strtolower($locale);
+    }
+
+    /**
+     * Get the language according to the feed type, based on the locale:
+     *
+     *   - RSS format: en-us (default: 'en-en').
+     *   - ATOM format: fr (default: 'en').
+     *
+     * @return string The language.
+     */
+    public function getTypeLanguage()
+    {
+        // Use the locale do define the language, if available.
+        if (! empty($this->locale) && preg_match('/^\w{2}[_\-]\w{2}/', $this->locale)) {
+            $length = ($this->feedType == self::$FEED_RSS) ? 5 : 2;
+            return str_replace('_', '-', substr($this->locale, 0, $length));
+        }
+        return ($this->feedType == self::$FEED_RSS) ? 'en-en' : 'en';
+    }
+
+    /**
+     * Format the latest item date found according to the feed type.
+     *
+     * Return an empty string if invalid DateTime is passed.
+     *
+     * @return string Formatted date.
+     */
+    protected function getLatestDateFormatted()
+    {
+        if (empty($this->latestDate) || !$this->latestDate instanceof DateTime) {
+            return '';
+        }
+
+        $type = ($this->feedType == self::$FEED_RSS) ? DateTime::RSS : DateTime::ATOM;
+        return $this->latestDate->format($type);
+    }
+
+    /**
+     * Returns the number of link to display according to 'nb' user input parameter.
+     *
+     * If 'nb' not set or invalid, default value: $DEFAULT_NB_LINKS.
+     * If 'nb' is set to 'all', display all filtered links (max parameter).
+     *
+     * @param int $max maximum number of links to display.
+     *
+     * @return int number of links to display.
+     */
+    public function getNbLinks($max)
+    {
+        if (empty($this->userInput['nb'])) {
+            return self::$DEFAULT_NB_LINKS;
+        }
+
+        if ($this->userInput['nb'] == 'all') {
+            return $max;
+        }
+
+        $intNb = intval($this->userInput['nb']);
+        if (! is_int($intNb) || $intNb == 0) {
+            return self::$DEFAULT_NB_LINKS;
+        }
+
+        return $intNb;
+    }
+}
diff --git a/application/LinkDB.php b/application/LinkDB.php
index 1b505620..a62341fc 100644
--- a/application/LinkDB.php
+++ b/application/LinkDB.php
@@ -341,17 +341,71 @@ You use the community supported version of the original Shaarli project, by Seba
     }
 
     /**
-     * Filter links.
+     * Returns the shaare corresponding to a smallHash.
      *
-     * @param string $type          Type of filter.
-     * @param mixed  $request       Search request, string or array.
+     * @param string $request QUERY_STRING server parameter.
+     *
+     * @return array $filtered array containing permalink data.
+     *
+     * @throws LinkNotFoundException if the smallhash is malformed or doesn't match any link.
+     */
+    public function filterHash($request)
+    {
+        $request = substr($request, 0, 6);
+        $linkFilter = new LinkFilter($this->_links);
+        return $linkFilter->filter(LinkFilter::$FILTER_HASH, $request);
+    }
+
+    /**
+     * Returns the list of articles for a given day.
+     *
+     * @param string $request day to filter. Format: YYYYMMDD.
+     *
+     * @return array list of shaare found.
+     */
+    public function filterDay($request) {
+        $linkFilter = new LinkFilter($this->_links);
+        return $linkFilter->filter(LinkFilter::$FILTER_DAY, $request);
+    }
+
+    /**
+     * Filter links according to search parameters.
+     *
+     * @param array  $filterRequest Search request content. Supported keys:
+     *                                - searchtags: list of tags
+     *                                - searchterm: term search
      * @param bool   $casesensitive Optional: Perform case sensitive filter
      * @param bool   $privateonly   Optional: Returns private links only if true.
      *
-     * @return array filtered links
+     * @return array filtered links, all links if no suitable filter was provided.
      */
-    public function filter($type = '', $request = '', $casesensitive = false, $privateonly = false)
+    public function filterSearch($filterRequest = array(), $casesensitive = false, $privateonly = false)
     {
+        // Filter link database according to parameters.
+        $searchtags = !empty($filterRequest['searchtags']) ? escape($filterRequest['searchtags']) : '';
+        $searchterm = !empty($filterRequest['searchterm']) ? escape($filterRequest['searchterm']) : '';
+
+        // Search tags + fullsearch.
+        if (empty($type) && ! empty($searchtags) && ! empty($searchterm)) {
+            $type = LinkFilter::$FILTER_TAG | LinkFilter::$FILTER_TEXT;
+            $request = array($searchtags, $searchterm);
+        }
+        // Search by tags.
+        elseif (! empty($searchtags)) {
+            $type = LinkFilter::$FILTER_TAG;
+            $request = $searchtags;
+        }
+        // Fulltext search.
+        elseif (! empty($searchterm)) {
+            $type = LinkFilter::$FILTER_TEXT;
+            $request = $searchterm;
+        }
+        // Otherwise, display without filtering.
+        else {
+            $type = '';
+            $request = '';
+        }
+
         $linkFilter = new LinkFilter($this->_links);
         return $linkFilter->filter($type, $request, $casesensitive, $privateonly);
     }
diff --git a/application/LinkFilter.php b/application/LinkFilter.php
index 3fd803cb..5e0d8015 100644
--- a/application/LinkFilter.php
+++ b/application/LinkFilter.php
@@ -44,7 +44,7 @@ class LinkFilter
      * Filter links according to parameters.
      *
      * @param string $type          Type of filter (eg. tags, permalink, etc.).
-     * @param string $request       Filter content.
+     * @param mixed  $request       Filter content.
      * @param bool   $casesensitive Optional: Perform case sensitive filter if true.
      * @param bool   $privateonly   Optional: Only returns private links if true.
      *
@@ -110,6 +110,8 @@ class LinkFilter
      * @param string $smallHash permalink hash.
      *
      * @return array $filtered array containing permalink data.
+     *
+     * @throws LinkNotFoundException if the smallhash doesn't match any link.
      */
     private function filterSmallHash($smallHash)
     {
@@ -121,6 +123,11 @@ class LinkFilter
                 return $filtered;
             }
         }
+
+        if (empty($filtered)) {
+            throw new LinkNotFoundException();
+        }
+
         return $filtered;
     }
 
@@ -318,3 +325,8 @@ class LinkFilter
         return array_filter(explode(' ', trim($tagsOut)), 'strlen');
     }
 }
+
+class LinkNotFoundException extends Exception
+{
+    protected $message = 'The link you are trying to reach does not exist or has been deleted.';
+}
diff --git a/application/LinkUtils.php b/application/LinkUtils.php
index 26dd6b67..d8dc8b5e 100644
--- a/application/LinkUtils.php
+++ b/application/LinkUtils.php
@@ -9,7 +9,7 @@
  */
 function html_extract_title($html)
 {
-    if (preg_match('!<title>(.*)</title>!is', $html, $matches)) {
+    if (preg_match('!<title>(.*?)</title>!is', $html, $matches)) {
         return trim(str_replace("\n", ' ', $matches[1]));
     }
     return false;
diff --git a/application/Router.php b/application/Router.php
index 6185f08e..a1e594a0 100644
--- a/application/Router.php
+++ b/application/Router.php
@@ -15,6 +15,10 @@ class Router
 
     public static $PAGE_DAILY = 'daily';
 
+    public static $PAGE_FEED_ATOM = 'atom';
+
+    public static $PAGE_FEED_RSS = 'rss';
+
     public static $PAGE_TOOLS = 'tools';
 
     public static $PAGE_CHANGEPASSWORD = 'changepasswd';
@@ -49,7 +53,7 @@ class Router
      * @param array  $get      $_SERVER['GET'].
      * @param bool   $loggedIn true if authenticated user.
      *
-     * @return self::page found.
+     * @return string page found.
      */
     public static function findPage($query, $get, $loggedIn)
     {
@@ -79,6 +83,14 @@ class Router
             return self::$PAGE_DAILY;
         }
 
+        if (startsWith($query, 'do='. self::$PAGE_FEED_ATOM)) {
+            return self::$PAGE_FEED_ATOM;
+        }
+
+        if (startsWith($query, 'do='. self::$PAGE_FEED_RSS)) {
+            return self::$PAGE_FEED_RSS;
+        }
+
         // At this point, only loggedin pages.
         if (!$loggedIn) {
             return self::$PAGE_LINKLIST;
diff --git a/application/Updater.php b/application/Updater.php
index 773a1ffa..58c13c07 100644
--- a/application/Updater.php
+++ b/application/Updater.php
@@ -137,7 +137,7 @@ class Updater
      */
     public function updateMethodRenameDashTags()
     {
-        $linklist = $this->linkDB->filter();
+        $linklist = $this->linkDB->filterSearch();
         foreach ($linklist as $link) {
             $link['tags'] = preg_replace('/(^| )\-/', '$1', $link['tags']);
             $link['tags'] = implode(' ', array_unique(LinkFilter::tagsStrToArray($link['tags'], true)));
diff --git a/application/Utils.php b/application/Utils.php
index 3d819716..5b8ca508 100644
--- a/application/Utils.php
+++ b/application/Utils.php
@@ -63,14 +63,22 @@ function endsWith($haystack, $needle, $case=true)
 
 /**
  * Htmlspecialchars wrapper
+ * Support multidimensional array of strings.
  *
- * @param string $str the string to escape.
+ * @param mixed $input Data to escape: a single string or an array of strings.
  *
  * @return string escaped.
  */
-function escape($str)
+function escape($input)
 {
-    return htmlspecialchars($str, ENT_COMPAT, 'UTF-8', false);
+    if (is_array($input)) {
+        $out = array();
+        foreach($input as $key => $value) {
+            $out[$key] = escape($value);
+        }
+        return $out;
+    }
+    return htmlspecialchars($input, ENT_COMPAT, 'UTF-8', false);
 }
 
 /**
@@ -226,7 +234,7 @@ function space2nbsp($text)
  *
  * @return string formatted description.
  */
-function format_description($description, $redirector) {
+function format_description($description, $redirector = false) {
     return nl2br(space2nbsp(text2clickable($description, $redirector)));
 }