<?php    
/**
 * DekiReader
 * is a class for getting instant email notifications with DekiWiki, if someone
 * changes a site in your Watchlist
 *
 * This script is free to use for private and commercial purposes
 * Author: Evgeny Anisiforov
 * mailtO: jeff at ebesucher point de
 *
 * I spend a whole day on writing this, so 
 * Please just leave a comment in my blog, if you use this. ;)
 */ 
 
/**
 * The most problem about getting notifications is that DekiWiki requires us
 * to be logged in (with a cookie) to be able to view the full rss feed
 * of changes (including changed things)
 * This is a big problem, as the most rss read does not have such function.
 * This script emulates a login for each user to get the auth cookie
 * and then sends the contents of the RSS-feed to the specified email-address
 * It also takes care of marking old messages as read, so your users won't
 * get notifications more than one time
 * 
 * The best practice would be to use a cronjob to start DekiReader every X minutes.
 * like this:
          * / 10 * * * * cd /www/Cron_Jobs/DekiReader; nice php notifyfromdb.php
 
 * notice: this file has only the class definitions, of cource you need a script
 * to create an object of DekiReader and pass the userdata to it.
 * */
 
/*
* this script needs the PEAR-packages "http_client" and "http_request"
*/
require_once "HTTP/Request.php";
require_once "HTTP/Client.php";
 
define('ERROR_DEKIWIKI_WRONG_CREDENTIALS', 'ERROR_DEKIWIKI_WRONG_CREDENTIALS');
define('ERROR_WEB_SERVICE', 'ERROR_WEB_SERVICE');
 
/* ------- Cookie's creation for Deki Wiki ------- */
class DekiCookie {
    public $url = "http://wiki.ebesucher.in";
 
    /** thanks to kurdte from: http://wiki.developer.mindtouch.com/MindTouch_Deki/Specs/Authentication_Providers */
    public function getAuthToken($login, $password) {
        /* Request a value for the user's cookie */
        $url = $this->url."/@api/deki/users/authenticate/";
        $req =& new HTTP_Request($url);
        $req->setBasicAuth($login, $password);
        $response = $req->sendRequest();
 
        if (!PEAR::isError($response)) {
        $output=$req->getResponseBody();
 
        /* Authentication proccess : if the response contains 401 authentication failed, the user is not registered */
        if(strpos($output,"authentication")==0 && strpos($output,"401")==0)
        {
            //$cookie_deki=$req->getResponseCookies();
            return $output;
            //setcookie("authtoken",str_replace("\"","",$cookie_deki[0]['value']),time()+3600, '/');
        }
        else
        {
            $error = ERROR_DEKIWIKI_WRONG_CREDENTIALS;
        }
        }
        else {
            $response->getMessage();
            $error = ERROR_WEB_SERVICE;
        } 
    }
}
 
class DekiReader {
    /**
        array with the date of users to check
        every item must contain: username, password
        every item may contain: authtoken
    */
    public $userdata;
    public $url;
    public $emaildomain;
    private $domain;
    /** Directory to store cache-Data (what feed-messages did we
      * allready read? */
    public $cachedir = "cache/";
 
    /**
     *  creates a DekiReader
     *  $emaildomain = the domain for sender-address
     *  if not given, we'll take the domain
    */
    public function DekiReader($domain, $userdata, $emaildomain = false) {
        $this->domain = $domain;
        $this->url = $domain."/index.php?title=Special:Watchlist&feed=rss";
        $this->userdata = $userdata;
        if (!$emaildomain) {
            //delete http:// or https:// at the beginning
            $d = eregi_replace('^http://', '', $domain);
            $d = eregi_replace('^https://', '', $d);
            $this->emaildomain = $d;   
        }
        else {
            $this->emaildomain = $emaildomain;
        }    
    }
 
    /**
    * Returns the proper RFC 822 formatted date. 
    * @return string
    */
    public function RFCDate($timestamp) {
       $tz = date("Z", $timestamp);
       $tzs = ($tz < 0) ? "-" : "+";
       $tz = abs($tz);
       $tz = ($tz/3600)*100 + ($tz%3600)/60;
       $result = sprintf("%s %s%04d", date("D, j M Y H:i:s", $timestamp), $tzs, $tz);
 
       return $result;
    }
 
    /** convert the Dateformat of the Feed to a Timestamp */
    public function strangeDate2Timestamp($date) {
        $regs = array();
        preg_match('~((\d+)-(\d+)-(\d+))T((\d+):(\d+):(\d+))Z~is', $date, $regs);
 
        //date and time
        $d = $regs[0];
        $t = $regs[1];
        return mktime($regs[6], $regs[7], $regs[8], $regs[3], $regs[4], $regs[2]);
    }
 
    /** read the message cache for a user */
    public function getCache($username) {
        //we use username and feed-url to cache read messages
        $cache  = $this->getCacheFilename($username);
 
        //read the cache
        $contents = file_exists($cache) ? file_get_contents($cache) : '';
 
        return $contents;
    }
 
    //get the filename of the message cache for a username
    public function getCacheFilename($username) {
        return $this->cachedir.'rss_' . md5($username."@".$this->url) . '.txt';
    }
 
    //add something to messagecache
    public function addToCache($username, $url) {
        $handle = fopen($this->getCacheFilename($username), 'a');
        fwrite($handle, $url . "\r\n");
        fclose($handle);
    }
 
    public function run() {
        $deki = new DekiCookie();
        header('Content-Type: text/plain');
        foreach ($this->userdata as $user) {
            echo "trying to get ".$this->url." for user ".$user['username']."\n";
            $req = new HTTP_Request($this->url);            
            $req->setMethod(HTTP_REQUEST_METHOD_GET);
            //do we have an authtoken?
            if (!$user['authtoken']) {
                $user['authtoken'] = $deki->getAuthToken($user['username'], $user['password']);
                echo "estimated authtoken for user ".$user['username'].": ".$user['authtoken']."\n";
            }
            $req->addCookie("authtoken", $user['authtoken']);
            $req->sendRequest();
            $rss = $req->getResponseBody();
 
            $xml    = new SimpleXMLElement($rss);
            $cache_contents = $this->getCache($user['username']);
 
            //some output
            echo 'Feed: ' . (string)$xml->link['href'] . "\r\n";
 
            //iterate the items in the feed
 
            foreach ($xml->entry as $item) {
                $url = (string)$item->link['href'];
                $id          = (string)$item->id;
                //did we allready read this?
                if (strpos($cache_contents, $id) !== false) {
                    echo "   read: $id\r\n";    
                    continue;
                }
                else {
                    echo "   unread: $id\r\n";
                }
 
                // The data from the feed
                $authorname  = (string)$item->author->name;
                //delete scopes for better compartibility
                $authorname  = str_replace("(", "", $authorname);
                $authorname  = str_replace(")", "", $authorname);
                //here we don't have a read possibility to get the email of
                //the author, we just simulate it by adding our domain name
                //to the username (or you could write a function that does that better..)
                $author      = '"'.$authorname.'"'."<".$authorname."@".$this->emaildomain.">";
 
                $title       = (string)$item->title;
                $link        = (string)$item->link['href'];
                $pubDate     = (string)$item->published;
                //convert the date from the feed to a compartible date format
                //for the emails, so that we can see the correct date of
                //the posting in our email program
                $updatedtimestamp = $this->strangeDate2Timestamp((string)$item->updated);
                $updated     = $this->RFCDate($updatedtimestamp);
                //we want all tags between <summary> and </summary>, so just
                //iterate through the children
                $description = "";
                foreach ($item->summary->children() as $child)
                {
                    $description .= $child->asXML();
                }
 
 
 
                $to   = $user['email']; 
                $mail = "
                <html><head></head><body>
                Page: <a href=\"$url\">$title</a>
                $description
                </body></html>"; 
 
                mail($to, '[Wiki] ' . $title, $mail, "From: $author"
                     ."\nContent-Type: text/html; charset=utf-8"
                     ."\nDate: ".$updated
                     ); 
 
                // we have send a notification for this item, so send
                // write this to the cache
                $this->addToCache($user['username'], $id);
            }
        }
    }
}
 
?>

<?php
  //include some internal db stuff
 // ....
 
  //then
include_once("dekireader.php");
 
$watch_accounts = array("jeff", "sebastian");
if (count($watch_accounts)<1) die("Please define Accounts to watch!"); 
$sql = "SELECT Username as username, PW as password, Email as email FROM Admins WHERE Username IN ('".implode("','", $watch_accounts)."')";
$res = mysql_query($sql);
echo mysql_error();
$userdata = mysql_get_whole_result($res);
 
$dekireader =  new DekiReader('http://mywiki',
                              $userdata, 'myemaildomain.no');
 
$dekireader->run();        
 
?>

<?php
  $userdata = array(array(
            'username'  => 'jeff',
            'password'  => 'secret',
            //'authtoken' => 'something', //you could cache authtokens to make the script faster
            'email'     => 'bla@bla.bla'
            )); 
$dekireader =  new DekiReader('http://mywiki',
                              $userdata, 'myemaildomain.no');
 
$dekireader->run();        
?>