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1 files changed, 241 insertions, 0 deletions

diff --git a/includes/backend.class.php b/includes/backend.class.php
new file mode 100644
index 000000000..865ec2e77
--- /dev/null
+++ b/includes/backend.class.php
@@ -0,0 +1,241 @@
+<?
+
+include "function.inc";
+
+class backend {
+
+  // Channel properties:
+  var $id;
+  var $url;
+  var $site;
+  var $file;
+  var $contact;
+  var $timestamp;
+
+  // Contains the raw rdf/rss/xml file:
+  var $data;
+
+  // Contains the parsed rdf/rss/xml file:
+  var $headlines = array();   // latest headlines
+
+
+  #####
+  # Syntax.......: backend(...);
+  # Description..: Constructor - initializes the internal variables.
+  #
+  function backend($id, $site, $url, $file, $contact, $timout = 1800) {
+    ### Get channel info:
+    $result = db_query("SELECT * FROM channel WHERE id = '$id' OR site = '$site'");
+
+    if ($channel = db_fetch_object($result)) {
+      ### Initialize internal variables:
+      $this->id = $channel->id;
+      $this->site = $channel->site;
+      $this->file = $channel->file;
+      $this->url = $channel->url;
+      $this->contact = $channel->contact;
+      $this->timestamp = $channel->timestamp;
+
+      ### Check to see whether we have to update our headlines first:
+      if (time() - $this->timestamp > $timout) $this->url2sql();
+
+      ### Read headlines:
+      $result = db_query("SELECT * FROM headlines WHERE id = $this->id ORDER BY number");
+      while ($headline = db_fetch_object($result)) {
+        array_push($this->headlines, "<A HREF=\"$headline->link\">$headline->title</A>");
+      }
+
+    }
+    else {
+      $this->site = $site;
+      $this->url = $url;
+      $this->file = $file;
+      $this->contact = $contact;
+    }
+  }
+
+  #####
+  # Syntax.......: rdf2sql(optional timout value in seconds);
+  # Description..: Reads a RDF file from a server, parses it and inserts
+  #                the fresh data in a MySQL table.
+  #
+  function rdf2sql($timout = 10) {
+    if ($this->file) {
+      ### Decode URL:
+      $url = parse_url($this->file);
+      $host = $url[host];
+      $port = $url[port] ? $url[port] : 80;
+      $path = $url[path];
+     
+      // print "<PRE><B>Debug:</B> $url - $host - $port - $path</PRE>";
+ 
+      ### Retrieve data from website:
+      $fp = fsockopen($host, $port, &$errno, &$errstr, $timout);
+
+      if ($fp) {
+        ### Get data from URL:
+        fputs($fp, "GET $path HTTP/1.0\n");
+        fputs($fp, "User-Agent: headline grabber\n");
+        fputs($fp, "Host: ". $host ."\n");
+        fputs($fp, "Accept: */*\n\n");
+
+        while(!feof($fp)) $data .= fgets($fp, 128);
+        
+        // print "<PRE>$data</PRE><HR>";
+
+        if (strstr($data, "200 OK")) {
+
+          ### Remove existing entries:
+          $result = db_query("DELETE FROM headlines WHERE id = $this->id");
+
+          ### Strip all 'junk':
+          $data = ereg_replace("<?xml.*/image>", "", $data);
+          $data = ereg_replace("</rdf.*", "", $data);
+          $data = chop($data);
+     
+          ### Iterating through our data processing each entry/item:
+          $items = explode("</item>", $data);
+          $number = 0;
+
+          for (reset($items); $item = current($items); next($items)) {
+            ### Extract data:
+            $link = ereg_replace(".*<link>", "", $item);
+            $link = ereg_replace("</link>.*", "", $link);
+            $title = ereg_replace(".*<title>", "", $item);
+            $title = ereg_replace("</title>.*", "", $title); 
+
+            ### Clean headlines:
+            $title = stripslashes(fixquotes($title));
+           
+            ### Count the number of stories:
+            $number += 1;
+
+            ### Insert item in database:
+            $result = db_query("INSERT INTO headlines (id, title, link, number) VALUES('$this->id', '$title', '$link', '$number')");
+          }
+ 
+          ### Mark channels as being updated:
+          $result = db_query("UPDATE channel SET timestamp = '". time() ."' WHERE id = $this->id");
+          $this->timestamp = time();
+        }
+        else print "<HR>RDF parser: 404 error?<BR><BR><PRE>$data</PRE><HR>";
+      }
+    }
+  }
+
+
+  #####
+  # Syntax.......: rss2sql(optional timout value in seconds);
+  # Description..: Reads a RSS file from a server, parses it and inserts
+  #                the fresh data in a MySQL table.
+  #
+  function rss2sql($timout = 10) {
+    print "backend->rss2sql : TODO<BR>";
+  }
+
+
+  #####
+  # Syntax.......: xml2sql(optional timout value in seconds);
+  # Description..: Reads a XML file from a server, parses it and inserts
+  #                the fresh data in a MySQL table.
+  #
+  function xml2sql($timout = 10) {
+    print "backend->xml2sql : TODO<BR>";
+  }
+
+
+  #####
+  # Syntax.......: url2sql(optional timout value in seconds);
+  # Description..: Generic function to fetch fresh headlines.  It checks whether
+  #                we are dealing with a remote RDF, RSS or XML file and calls
+  #                the appropriate function to fetch the headline.  The function
+  #                is an abstraction towards the programmer as he doesn't need
+  #                to know with what file extension we are dealing.
+  #
+  function url2sql($timout = 10) {
+    if (strstr($this->file, ".rdf")) $this->rdf2sql($timout);
+    if (strstr($this->file, ".rss")) $this->rss2sql($timout);
+    if (strstr($this->file, ".xml")) $this->xml2sql($timout);
+  }
+
+
+  #####
+  # Syntax.......: 
+  # Description..: 
+  #
+  function displayHeadlines($timout = 1800) {
+    global $theme;
+
+    ### Get channel info:
+    $result = db_query("SELECT * FROM channel WHERE site = '$this->site'");
+
+    if ($this->id) {
+
+      ### Check to see whether we have to update our headlines first:
+      if (time() - $this->timestamp > $timout) $this->url2sql();
+
+      ### Grab headlines from database:
+      $result = db_query("SELECT * FROM headlines WHERE id = $this->id ORDER BY number");
+      while ($headline = db_fetch_object($result)) {
+        $content .= "<LI><A HREF=\"$headline->link\">$headline->title</A></LI>";
+      }
+      ### Add timestamp:
+      $update = round((time() - $this->timestamp) / 60);
+      $content .= "<P ALIGN=\"right\">[ <A HREF=\"backend.php?op=reset&site=$this->site\"><FONT COLOR=\"$theme->hlcolor2\">reset</FONT></A> | updated $update min. ago ]</P>";      
+      
+      ### Display box:
+      $theme->box("$this->site", $content);
+    }
+    else print "<P>Warning: something whiched happened: specified channel could not be found in database.</P>";
+  }
+
+
+  #####
+  # Syntax.......: add()
+  # Description..: Adds this backend to the database.
+  #
+  function add() {
+    ### Add channel:    
+    $result = db_query("INSERT INTO channel (site, file, url, contact, timestamp) VALUES ('$this->site', '$this->file', '$this->url', '$this->contact', 42)");
+  }
+
+
+  #####
+  # Syntax.......: delete()
+  # Description..: Deletes this backend
+  #
+  function delete() {
+    ### Delete channel:    
+    $result = db_query("DELETE FROM channel WHERE id = $this->id");
+
+    ### Delete headlines:
+    $result = db_query("DELETE FROM headlines WHERE id = $this->id");    
+  }
+
+  #####
+  # Syntax.......: refresh()
+  # Description..: Deletes all headlines associated with this backend.
+  #
+  function refresh() {
+    ### Delete headlines:
+    $result = db_query("DELETE FROM headlines WHERE id = $this->id");    
+
+    ### Mark channel as invalid to enforce an update:
+    $result = db_query("UPDATE channel SET timestamp = 42 WHERE id = $this->id");    
+  }
+
+  #####
+  # Syntax.......: dump()
+  # Description..: Dumps the content of this class to screen.
+  #
+  function dump() {
+    print "<B>Dump backend:</B><BR>";
+    print "Id: $this->id<BR>";
+    print "Site: $this->site<BR>";
+    print "URL: $this->url<BR>";
+    print "File: $this->file<BR>";
+    print "Contact: $this->contact<BR>";
+  }
+}
+
+?>