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    1: # The LearningOnline Network
    2: # RSS Feeder
    3: #
    4: # $Id: lonrss.pm,v 1.14 2006/04/13 16:23:03 www Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: 
   29: package Apache::lonrss;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common);
   33: use Apache::loncommon;
   34: use Apache::lonnet;
   35: use Apache::lontexconvert;
   36: use Apache::lonlocal;
   37: use Apache::lonhtmlcommon;
   38: 
   39: sub filterfeedname {
   40:     my $filename=shift;
   41:     $filename=~s/(\_rss\.html|\.rss)$//;
   42:     $filename=~s/\W//g;
   43:     return $filename;
   44: }
   45: 
   46: sub feedname {
   47:     return 'nohist_'.&filterfeedname(shift).'_rssfeed';
   48: }
   49: 
   50: sub displayfeedname {
   51:     my ($rawname,$uname,$udom)=@_;
   52:     my $filterfilename=&filterfeedname($rawname);
   53: # do we have a stored name?
   54:     my %stored=&Apache::lonnet::get('nohist_all_rss_feeds',[$filterfilename],$udom,$uname);
   55:     if ($stored{$filterfilename}) { return $stored{$filterfilename}; }
   56: # no, construct a name
   57:     my $name=$filterfilename; 
   58:     if ($name=~/^CourseBlog/) {
   59:         $name=&mt('Course Blog');
   60: 	if ($env{'course.'.$env{'request.course.id'}.'.description'}) {
   61: 	    $name.=' '.$env{'course.'.$env{'request.course.id'}.'.description'};
   62: 	}
   63:     } else {
   64: 	$name=~s/\_/ /g;
   65:     }
   66:     return $name;
   67: }
   68: 
   69: sub renamefeed {
   70:     my ($rawname,$uname,$udom,$newname)=@_;
   71:     return &Apache::lonnet::put('nohist_all_rss_feeds',
   72: 				{ &filterfeedname($rawname) => $newname },
   73: 				$udom,$uname);
   74: }
   75: 
   76: sub advertisefeeds {
   77:     my ($uname,$udom,$edit)=@_;
   78:     my $feeds='';
   79:     my %feednames=&Apache::lonnet::dump('nohist_all_rss_feeds',$udom,$uname);
   80:     my $mode='public';
   81:     if ($edit) {
   82: 	$mode='adm';
   83:     }
   84:     foreach my $feed (sort(keys(%feednames))) {
   85: 	if ($feed!~/^error\:/) {
   86: 	    my $feedurl='http://'.$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.$feed.'.rss';
   87: 	    my $htmlurl='http://'.$ENV{'HTTP_HOST'}.'/'.$mode.'/'.$udom.'/'.$uname.'/'.$feed.'_rss.html';
   88: 	    $feeds.='<li>'.$feednames{$feed}.
   89: 		'<br />'.($edit?&mt('Edit'):'HTML').': <a href="'.$htmlurl.'"><tt>'.$htmlurl.'</tt></a>'.
   90: 		($edit?'':'<br />RSS: <a href="'.$feedurl.'"><tt>'.$feedurl.'</tt></a>').'</li>';
   91: 	}
   92:     }
   93:     if ($feeds) {
   94: 	return '<h4>'.&mt('Available RSS Feeds and Blogs').'</h4><ul>'.$feeds.'</ul>';
   95:     } else {
   96:         return '';
   97:     }
   98: }
   99: 
  100: sub rss_link {
  101:     my ($url) = @_;
  102:     return qq|<link rel="alternate" type="application/rss+xml" title="Course Announcements" href="$url" />|;
  103: 
  104: }
  105: 
  106: {
  107:     my $feedcounter;
  108:     sub addentry {
  109: 	$feedcounter++;
  110: 	my $id=time.'00000'.$$.'00000'.$feedcounter;
  111: 	return &editentry($id,@_);
  112:     }
  113: }
  114: 
  115: sub editentry {
  116:     my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enclength,$enctype)=@_;
  117:     my $feedname=&feedname($filename);
  118:     &Apache::lonnet::put('nohist_all_rss_feeds',
  119: 			 { &filterfeedname($filename) => &displayfeedname($filename,$uname,$udom) },
  120: 			 $udom,$uname);
  121:     return &Apache::lonnet::put($feedname,{
  122: 	$id.'_title' => $title,
  123: 	$id.'_description' => $description,
  124: 	$id.'_link' => $url,
  125: 	$id.'_enclosureurl' => $encurl,
  126: 	$id.'_enclosurelength' => $enclength,
  127: 	$id.'_enclosuretype' => $enctype,
  128: 	$id.'_status' => $status},$udom,$uname);
  129: }
  130: 
  131: sub changestatus {
  132:     my ($id,$uname,$udom,$filename,$status)=@_;
  133:     my $feedname=&feedname($filename);
  134:     if ($status eq 'deleted') {
  135: 	return &Apache::lonnet::del($feedname,[$id.'_title',
  136: 					       $id.'_description',
  137: 					       $id.'_link',
  138: 					       $id.'_enclosureurl',
  139: 					       $id.'_enclosurelength',
  140: 					       $id.'_enclosuretype',
  141: 					       $id.'_status'],$udom,$uname);
  142:     } else {
  143: 	return &Apache::lonnet::put($feedname,{$id.'_status' => $status},$udom,$uname);
  144:     }
  145: }
  146: 
  147: sub changed_js {
  148:     return <<ENDSCRIPT;
  149: <script type="text/javascript">
  150:     function changed(tform,id) {
  151:         tform.elements[id+"_modified"].checked=true;
  152:     }
  153: </script>
  154: ENDSCRIPT
  155: }
  156: 
  157: sub handler {
  158:     my ($r) = @_;
  159: 
  160:     my $edit=0;
  161:     my $html=0;
  162:     my (undef,$mode,$udom,$uname,$filename)=split(/\//,$r->uri);
  163:     if (($mode eq 'adm') && ($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
  164: 	$edit=1;
  165: 	$html=1;
  166:     }
  167:     if ($filename=~/\.html$/) {
  168: 	$html=1;
  169:     }
  170:     if ($html) {
  171: 	&Apache::loncommon::content_type($r,'text/html');
  172:     } else {
  173: # Workaround Mozilla/Firefox
  174: #	&Apache::loncommon::content_type($r,'application/rss+xml');
  175: 	&Apache::loncommon::content_type($r,'text/xml');
  176:     }
  177:     $r->send_http_header;
  178:     return OK if $r->header_only;
  179: 
  180:     my $filterfeedname=&filterfeedname($filename);
  181:     my $feedname=&feedname($filename);
  182:     my $displayfeedname=&displayfeedname($filename,$uname,$udom);
  183:     if ($html) {
  184: 	$r->print(&Apache::loncommon::start_page($displayfeedname,undef,
  185: 						 {'domain'         => $udom,
  186: 						  'force_register' =>
  187: 						      $env{'form.register'}}).
  188: 		  &changed_js());
  189: 
  190:     } else {
  191: 	$r->print("<rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1'>\n<channel>".
  192: 		  "\n<link>http://".$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.
  193: 		  $filterfeedname.'_rss.html</link>'.
  194: 		  "\n<description>".
  195: 		  &mt('An RSS Feed provided by the LON-CAPA Learning Content Management System').
  196: 		  '</description>');
  197:     }
  198: # Is this user for real?
  199:     my $homeserver=&Apache::lonnet::homeserver($uname,$udom);
  200:     if ($html) {
  201: 	$r->print(&advertisefeeds($uname,$udom,$edit));
  202:     } 
  203:     if ($homeserver eq 'no_host') {
  204: 	$r->print(($html?'<h3>':'<title>').&mt('No feed available').($html?'</h3>':'</title>'));
  205:     } else {
  206: # Course or user?
  207: 	my $name='';
  208: 	if ($uname=~/^\d/) {
  209: 	    my %cenv=&Apache::lonnet::dump('environment',$udom,$uname);
  210: 	    $name=$cenv{'description'};
  211: 	} else {
  212: 	    $name=&Apache::loncommon::nickname($uname,$udom);
  213: 	}
  214:         $r->print("\n".
  215: 		  ($html?'<h3>':'<title>').
  216: 		  &mt('LON-CAPA Feed "[_1]" for [_2]',$displayfeedname,$name).
  217: 		  ($html?'</h3>'.($edit?'<form method="post"><br />'.
  218: 				  &mt('Name of blog/journal').
  219: 				  ': <input type="text" size="50" name="newblogname" value="'.
  220: 				  $displayfeedname.'" />':'').'<ul>':'</title>'));
  221: # Render private items?
  222:         my $viewpubliconly=1;
  223:         if (($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
  224: 	    $viewpubliconly=0;
  225: 	}
  226: # Get feed items
  227:         my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
  228: 	foreach my $entry (sort(keys(%newsfeed))) {
  229: 	    if ($entry=~/^(\d+)\_status$/) {
  230: 		my $id=$1;
  231: 		if ($edit) {
  232: 		    my %lt=&Apache::lonlocal::texthash('public' => 'public',
  233: 						       'private' => 'private',
  234: 						       'hidden' => 'hidden',
  235: 						       'delete' => 'delete',
  236: 						       'store' => 'Store changes');
  237: 		    my %status=();
  238: 		    $status{$newsfeed{$id.'_status'}}='checked="checked"';
  239: 		    $r->print(<<ENDEDIT);
  240: <li>
  241: <label><input name='$id\_modified' type='checkbox' /> $lt{'store'}</label>
  242: &nbsp;&nbsp;
  243: <label><input name='$id\_status' type="radio" value="public" $status{'public'} onClick="changed(this.form,'$id');" /> $lt{'public'}</label>
  244: &nbsp;&nbsp;
  245: <label><input name='$id\_status' type="radio" value="private" $status{'private'} onClick="changed(this.form,'$id');" /> $lt{'private'}</label>
  246: &nbsp;&nbsp;
  247: <label><input name='$id\_status' type="radio" value="hidden" $status{'hidden'} onClick="changed(this.form,'$id');" /> $lt{'hidden'}</label>
  248: &nbsp;&nbsp;
  249: <label><input name='$id\_status' type="radio" value="delete" onClick="changed(this.form,'$id');" /> $lt{'delete'}</label>
  250: <br />
  251: <input name='$id\_title' type='text' size='80' value='$newsfeed{$id.'_title'}' onChange="changed(this.form,'$id');" /><br />
  252: <textarea name='$id\_description' rows="6" cols="80" onChange="changed(this.form,'$id');">$newsfeed{$id.'_description'}</textarea><br />
  253: <input name='$id\_link' type='text' size='80' value='$newsfeed{$id.'_link'}' onChange="changed(this.form,'$id');" />
  254: <hr /></li>
  255: ENDEDIT
  256: 		} else {
  257: 		    if (($newsfeed{$id.'_status'} ne 'public') && ($viewpubliconly)) { next; }
  258: 		    if ($newsfeed{$id.'_status'} eq 'hidden') { next; }
  259: 		    $r->print("\n".($html?"\n<li><b>":"<item>\n<title>").$newsfeed{$id.'_title'}.
  260: 			      ($html?"</b><br />\n":"</title>\n<description>").
  261: 			      $newsfeed{$id.'_description'}.
  262: 			      ($html?"<br />\n<a href='":"</description>\n<link>").
  263: 			      "http://".$ENV{'HTTP_HOST'}.
  264: 			      $newsfeed{$id.'_link'}.
  265: 			      ($html?("'>".&mt('Read more')."</a><br />\n"):"</link>\n"));
  266: 		    if ($newsfeed{$id.'_enclosureurl'}) {
  267: 			$r->print(($html?"<a href='":"\n<enclosure url='").
  268: 				  $newsfeed{$id.'_enclosureurl'}."' length='".$newsfeed{$id.'_enclosurelength'}.
  269: 				  "' type='".$newsfeed{$id.'_enclosuretype'}.($html?"'>".&mt('Enclosure')."</a>":"' />"));
  270: 		    }
  271: 		    if ($html) {
  272: 			$r->print("\n<hr /></li>\n");
  273: 		    } else {
  274: 			$r->print("\n<guid isPermaLink='false'>".$id.$filterfeedname.'_'.$udom.'_'.$uname."</guid></item>\n");
  275: 		    }
  276: 		}
  277: 	    }
  278: 	}
  279:     }
  280:     $r->print("\n".($html?'</ul>'.($edit?'<input type="submit" value="'.&mt('Store Marked Changes').'" /></form>':'').&Apache::loncommon::end_page():'</channel></rss>'."\n"));
  281:     return OK;
  282: } 
  283: 1;
  284: __END__