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[github/wallabag/wallabag.git] / inc / 3rdparty / libraries / feedwriter / FeedWriter.php

<?php\r
define('RSS2', 1, true);\r
define('JSON', 2, true);\r
define('JSONP', 3, true);\r
define('ATOM', 4, true);\r
\r
 /**\r
 * Univarsel Feed Writer class\r
 *\r
 * Genarate RSS2 or JSON (original: RSS 1.0, RSS2.0 and ATOM Feed)\r
 *\r
 * Modified for FiveFilters.org's Full-Text RSS project\r
 * to allow for inclusion of hubs, JSON output.\r
 * Stripped RSS1 and ATOM support.\r
 *\r
 * @package     UnivarselFeedWriter\r
 * @author      Anis uddin Ahmad <anisniit@gmail.com>\r
 * @link        http://www.ajaxray.com/projects/rss\r
 */\r
 class FeedWriter\r
 {\r
     private $self          = null;     // self URL - http://feed2.w3.org/docs/warning/MissingAtomSelfLink.html\r
     private $hubs          = array();  // PubSubHubbub hubs\r
     private $channels      = array();  // Collection of channel elements\r
     private $items         = array();  // Collection of items as object of FeedItem class.\r
     private $data          = array();  // Store some other version wise data\r
     private $CDATAEncoding = array();  // The tag names which have to encoded as CDATA\r
     private $xsl            = null;        // stylesheet to render RSS (used by Chrome)\r
     private $json            = null;        // JSON object\r
\r
     private $version   = null;\r
\r
    /**\r
    * Constructor\r
    *\r
    * @param    constant    the version constant (RSS2 or JSON).\r
    */\r
    function __construct($version = RSS2)\r
    {\r
        $this->version = $version;\r
\r
        // Setting default value for assential channel elements\r
        $this->channels['title']        = $version . ' Feed';\r
        $this->channels['link']         = 'http://www.ajaxray.com/blog';\r
\r
        //Tag names to encode in CDATA\r
        $this->CDATAEncoding = array('description', 'content:encoded', 'content', 'subtitle', 'summary');\r
    }\r
\r
    public function setFormat($format) {\r
        $this->version = $format;\r
    }\r
\r
    // Start # public functions ---------------------------------------------\r
\r
    /**\r
    * Set a channel element\r
    * @access   public\r
    * @param    srting  name of the channel tag\r
    * @param    string  content of the channel tag\r
    * @return   void\r
    */\r
    public function setChannelElement($elementName, $content)\r
    {\r
        $this->channels[$elementName] = $content ;\r
    }\r
\r
    /**\r
    * Set multiple channel elements from an array. Array elements\r
    * should be 'channelName' => 'channelContent' format.\r
    *\r
    * @access   public\r
    * @param    array   array of channels\r
    * @return   void\r
    */\r
    public function setChannelElementsFromArray($elementArray)\r
    {\r
        if(! is_array($elementArray)) return;\r
        foreach ($elementArray as $elementName => $content)\r
        {\r
            $this->setChannelElement($elementName, $content);\r
        }\r
    }\r
\r
    /**\r
    * Genarate the actual RSS/JSON file\r
    *\r
    * @access   public\r
    * @return   void\r
    */\r
    public function genarateFeed($withHeaders = true)\r
    {\r
        if ($withHeaders) {\r
          if ($this->version == RSS2) {\r
              header('Content-type: text/xml; charset=UTF-8');\r
              // this line prevents Chrome 20 from prompting download\r
              // used by Google: https://news.google.com/news/feeds?ned=us&topic=b&output=rss\r
              header('X-content-type-options: nosniff');\r
          } elseif ($this->version == JSON) {\r
              header('Content-type: application/json; charset=UTF-8');\r
          } elseif ($this->version == JSONP) {\r
              header('Content-type: application/javascript; charset=UTF-8');\r
          }\r
        }\r
\r
        if ($this->version == JSON || $this->version == JSONP) {\r
          $this->json = new stdClass();\r
        }\r
\r
\r
        $this->printHead();\r
        $this->printChannels();\r
        $this->printItems();\r
        $this->printTale();\r
        if ($this->version == JSON || $this->version == JSONP) {\r
            echo json_encode($this->json);\r
        }\r
    }\r
\r
    public function &getItems()\r
    {\r
    	return $this->items;\r
    }\r
\r
    /**\r
    * Create a new FeedItem.\r
    *\r
    * @access   public\r
    * @return   object  instance of FeedItem class\r
    */\r
    public function createNewItem()\r
    {\r
        $Item = new FeedItem($this->version);\r
        return $Item;\r
    }\r
\r
    /**\r
    * Add a FeedItem to the main class\r
    *\r
    * @access   public\r
    * @param    object  instance of FeedItem class\r
    * @return   void\r
    */\r
    public function addItem($feedItem)\r
    {\r
        $this->items[] = $feedItem;\r
    }\r
\r
    // Wrapper functions -------------------------------------------------------------------\r
\r
    /**\r
    * Set the 'title' channel element\r
    *\r
    * @access   public\r
    * @param    srting  value of 'title' channel tag\r
    * @return   void\r
    */\r
    public function setTitle($title)\r
    {\r
        $this->setChannelElement('title', $title);\r
    }\r
\r
    /**\r
    * Add a hub to the channel element\r
    *\r
    * @access   public\r
    * @param    string URL\r
    * @return   void\r
    */\r
    public function addHub($hub)\r
    {\r
        $this->hubs[] = $hub;\r
    }\r
\r
    /**\r
    * Set XSL URL\r
    *\r
    * @access   public\r
    * @param    string URL\r
    * @return   void\r
    */\r
    public function setXsl($xsl)\r
    {\r
        $this->xsl = $xsl;\r
    }\r
\r
    /**\r
    * Set self URL\r
    *\r
    * @access   public\r
    * @param    string URL\r
    * @return   void\r
    */\r
    public function setSelf($self)\r
    {\r
        $this->self = $self;\r
    }\r
\r
    /**\r
    * Set the 'description' channel element\r
    *\r
    * @access   public\r
    * @param    srting  value of 'description' channel tag\r
    * @return   void\r
    */\r
    public function setDescription($description)\r
    {\r
        $tag = ($this->version == ATOM)? 'subtitle' : 'description';\r
        $this->setChannelElement($tag, $description);\r
    }\r
\r
    /**\r
    * Set the 'link' channel element\r
    *\r
    * @access   public\r
    * @param    srting  value of 'link' channel tag\r
    * @return   void\r
    */\r
    public function setLink($link)\r
    {\r
        $this->setChannelElement('link', $link);\r
    }\r
\r
    /**\r
    * Set the 'image' channel element\r
    *\r
    * @access   public\r
    * @param    srting  title of image\r
    * @param    srting  link url of the imahe\r
    * @param    srting  path url of the image\r
    * @return   void\r
    */\r
    public function setImage($title, $link, $url)\r
    {\r
        $this->setChannelElement('image', array('title'=>$title, 'link'=>$link, 'url'=>$url));\r
    }\r
\r
    // End # public functions ----------------------------------------------\r
\r
    // Start # private functions ----------------------------------------------\r
\r
    /**\r
    * Prints the xml and rss namespace\r
    *\r
    * @access   private\r
    * @return   void\r
    */\r
    private function printHead()\r
    {\r
        if ($this->version == RSS2)\r
        {\r
            $out  = '<?xml version="1.0" encoding="utf-8"?>'."\n";\r
            if ($this->xsl) $out .= '<?xml-stylesheet type="text/xsl" href="'.htmlspecialchars($this->xsl).'"?>' . PHP_EOL;\r
            $out .= '<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:media="http://search.yahoo.com/mrss/">' . PHP_EOL;\r
            echo $out;\r
        }\r
        elseif ($this->version == JSON || $this->version == JSONP)\r
        {\r
            $this->json->rss = array('@attributes' => array('version' => '2.0'));\r
        }\r
    }\r
\r
    /**\r
    * Closes the open tags at the end of file\r
    *\r
    * @access   private\r
    * @return   void\r
    */\r
    private function printTale()\r
    {\r
        if ($this->version == RSS2)\r
        {\r
            echo '</channel>',PHP_EOL,'</rss>';\r
        }\r
        // do nothing for JSON\r
    }\r
\r
    /**\r
    * Creates a single node as xml format\r
    *\r
    * @access   private\r
    * @param    string  name of the tag\r
    * @param    mixed   tag value as string or array of nested tags in 'tagName' => 'tagValue' format\r
    * @param    array   Attributes(if any) in 'attrName' => 'attrValue' format\r
    * @return   string  formatted xml tag\r
    */\r
    private function makeNode($tagName, $tagContent, $attributes = null)\r
    {\r
        if ($this->version == RSS2)\r
        {\r
            $nodeText = '';\r
            $attrText = '';\r
            if (is_array($attributes))\r
            {\r
                foreach ($attributes as $key => $value)\r
                {\r
                    $attrText .= " $key=\"$value\" ";\r
                }\r
            }\r
            $nodeText .= "<{$tagName}{$attrText}>";\r
            if (is_array($tagContent))\r
            {\r
                foreach ($tagContent as $key => $value)\r
                {\r
                    $nodeText .= $this->makeNode($key, $value);\r
                }\r
            }\r
            else\r
            {\r
                //$nodeText .= (in_array($tagName, $this->CDATAEncoding))? $tagContent : htmlentities($tagContent);\r
                $nodeText .= htmlspecialchars($tagContent);\r
            }\r
            //$nodeText .= (in_array($tagName, $this->CDATAEncoding))? "]]></$tagName>" : "</$tagName>";\r
            $nodeText .= "</$tagName>";\r
            return $nodeText . PHP_EOL;\r
        }\r
        elseif ($this->version == JSON || $this->version == JSONP)\r
        {\r
            $tagName = (string)$tagName;\r
            $tagName = strtr($tagName, ':', '_');\r
            $node = null;\r
            if (!$tagContent && is_array($attributes) && count($attributes))\r
            {\r
                $node = array('@attributes' => $this->json_keys($attributes));\r
            } else {\r
                if (is_array($tagContent)) {\r
                    $node = $this->json_keys($tagContent);\r
                } else {\r
                    $node = $tagContent;\r
                }\r
            }\r
            return $node;\r
        }\r
        return ''; // should not get here\r
    }\r
\r
    private function json_keys(array $array) {\r
        $new = array();\r
        foreach ($array as $key => $val) {\r
            if (is_string($key)) $key = strtr($key, ':', '_');\r
            if (is_array($val)) {\r
                $new[$key] = $this->json_keys($val);\r
            } else {\r
                $new[$key] = $val;\r
            }\r
        }\r
        return $new;\r
    }\r
\r
    /**\r
    * @desc     Print channels\r
    * @access   private\r
    * @return   void\r
    */\r
    private function printChannels()\r
    {\r
        //Start channel tag\r
        if ($this->version == RSS2) {\r
            echo '<channel>' . PHP_EOL;\r
            // add hubs\r
            foreach ($this->hubs as $hub) {\r
                //echo $this->makeNode('link', '', array('rel'=>'hub', 'href'=>$hub, 'xmlns'=>'http://www.w3.org/2005/Atom'));\r
                echo '<link rel="hub"  href="'.htmlspecialchars($hub).'" xmlns="http://www.w3.org/2005/Atom" />' . PHP_EOL;\r
            }\r
            // add self\r
            if (isset($this->self)) {\r
                //echo $this->makeNode('link', '', array('rel'=>'self', 'href'=>$this->self, 'xmlns'=>'http://www.w3.org/2005/Atom'));\r
                echo '<link rel="self" href="'.htmlspecialchars($this->self).'" xmlns="http://www.w3.org/2005/Atom" />' . PHP_EOL;\r
            }\r
            //Print Items of channel\r
            foreach ($this->channels as $key => $value)\r
            {\r
                echo $this->makeNode($key, $value);\r
            }\r
        } elseif ($this->version == JSON || $this->version == JSONP) {\r
            $this->json->rss['channel'] = (object)$this->json_keys($this->channels);\r
        }\r
    }\r
\r
    /**\r
    * Prints formatted feed items\r
    *\r
    * @access   private\r
    * @return   void\r
    */\r
    private function printItems()\r
    {\r
        foreach ($this->items as $item) {\r
            $itemElements = $item->getElements();\r
\r
            echo $this->startItem();\r
\r
            if ($this->version == JSON || $this->version == JSONP) {\r
                $json_item = array();\r
            }\r
\r
            foreach ($itemElements as $thisElement) {\r
                foreach ($thisElement as $instance) {\r
                    if ($this->version == RSS2) {\r
                        echo $this->makeNode($instance['name'], $instance['content'], $instance['attributes']);\r
                    } elseif ($this->version == JSON || $this->version == JSONP) {\r
                        $_json_node = $this->makeNode($instance['name'], $instance['content'], $instance['attributes']);\r
                        if (count($thisElement) > 1) {\r
                            $json_item[strtr($instance['name'], ':', '_')][] = $_json_node;\r
                        } else {\r
                            $json_item[strtr($instance['name'], ':', '_')] = $_json_node;\r
                        }\r
                    }\r
                }\r
            }\r
            echo $this->endItem();\r
            if ($this->version == JSON || $this->version == JSONP) {\r
                if (count($this->items) > 1) {\r
                    $this->json->rss['channel']->item[] = $json_item;\r
                } else {\r
                    $this->json->rss['channel']->item = $json_item;\r
                }\r
            }\r
        }\r
    }\r
\r
    /**\r
    * Make the starting tag of channels\r
    *\r
    * @access   private\r
    * @return   void\r
    */\r
    private function startItem()\r
    {\r
        if ($this->version == RSS2)\r
        {\r
            echo '<item>' . PHP_EOL;\r
        }\r
        // nothing for JSON\r
    }\r
\r
    /**\r
    * Closes feed item tag\r
    *\r
    * @access   private\r
    * @return   void\r
    */\r
    private function endItem()\r
    {\r
        if ($this->version == RSS2)\r
        {\r
            echo '</item>' . PHP_EOL;\r
        }\r
        // nothing for JSON\r
    }\r
\r
    // End # private functions ----------------------------------------------\r
 }