1: # The LearningOnline Network
2: # RSS Feeder
3: #
4: # $Id: lonrss.pm,v 1.4 2005/11/18 19:32:05 albertel 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: $filename=~s/\.rss$//;
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)=@_;
78: my $feeds='';
79: my %feednames=&Apache::lonnet::dump('nohist_all_rss_feeds',$udom,$uname);
80: foreach my $feed (sort(keys(%feednames))) {
81: if ($feed!~/^error\:/) {
82: my $url='feed://'.$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.$feed.'.rss';
83: $feeds.='<li><a href="'.$url.'">'.
84: $feednames{$feed}.'</a><br /><tt>'.$url.'</tt></li>';
85: }
86: }
87: if ($feeds) {
88: return '<h4>'.&mt('Available RSS Feeds and Blogs').'</h4><ul>'.$feeds.'</ul>';
89: } else {
90: return '';
91: }
92: }
93:
94: {
95: my $feedcounter;
96: sub addentry {
97: $feedcounter++;
98: my $id=time.'00000'.$$.'00000'.$feedcounter;
99: return &editentry($id,@_);
100: }
101: }
102:
103: sub editentry {
104: my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enclength,$enctype)=@_;
105: my $feedname=&feedname($filename);
106: &Apache::lonnet::put('nohist_all_rss_feeds',
107: { &filterfeedname($filename) => &displayfeedname($filename,$uname,$udom) },
108: $udom,$uname);
109: return &Apache::lonnet::put($feedname,{
110: $id.'_title' => $title,
111: $id.'_description' => $description,
112: $id.'_link' => $url,
113: $id.'_enclosureurl' => $encurl,
114: $id.'_enclosurelength' => $enclength,
115: $id.'_enclosuretype' => $enctype,
116: $id.'_status' => $status},$udom,$uname);
117: }
118:
119: sub changestatus {
120: my ($id,$uname,$udom,$filename,$status)=@_;
121: my $feedname=&feedname($filename);
122: if ($status eq 'deleted') {
123: return &Apache::lonnet::del($feedname,[$id.'_title',
124: $id.'_description',
125: $id.'_link',
126: $id.'_enclosureurl',
127: $id.'_enclosurelength',
128: $id.'_enclosuretype',
129: $id.'_status'],$udom,$uname);
130: } else {
131: return &Apache::lonnet::put($feedname,{$id.'_status' => $status},$udom,$uname);
132: }
133: }
134:
135: sub handler {
136: my $r = shift;
137: &Apache::loncommon::content_type($r,'application/rss+xml');
138: $r->send_http_header;
139: return OK if $r->header_only;
140:
141: my (undef,undef,$udom,$uname,$filename)=split(/\//,$r->uri);
142: my $filterfeedname=&filterfeedname($filename);
143: my $feedname=&feedname($filename);
144: my $displayfeedname=&displayfeedname($filename,$uname,$udom);
145: $r->print("<rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1'>\n<channel>".
146: "\n<link>http://".$ENV{'HTTP_HOST'}.'/</link>'.
147: "\n<description>".&mt('An RSS Feed provided by the LON-CAPA Learning Content Management System').'</description>');
148: # Is this user for real?
149: my $homeserver=&Apache::lonnet::homeserver($uname,$udom);
150: if ($homeserver eq 'no_host') {
151: $r->print('<title>'.&mt('No feed available').'</title>');
152: } else {
153: # Course or user?
154: my $name='';
155: if ($uname=~/^\d/) {
156: my %cenv=&Apache::lonnet::dump('environment',$udom,$uname);
157: $name=$cenv{'description'};
158: } else {
159: $name=&Apache::loncommon::nickname($uname,$udom);
160: }
161: $r->print("\n<title>".&mt('LON-CAPA RSS Feed "[_1]" for [_2]',$displayfeedname,$name).'</title>');
162: # Render private items?
163: my $viewpubliconly=1;
164: if (($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
165: $viewpubliconly=0;
166: }
167: # Get feed items
168: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
169: foreach my $entry (sort(keys(%newsfeed))) {
170: if ($entry=~/^(\d+)\_status$/) {
171: my $id=$1;
172: if (($newsfeed{$id.'_status'} ne 'public') && ($viewpubliconly)) { next; }
173: if ($newsfeed{$id.'_status'} eq 'hidden') { next; }
174: $r->print("\n<item>\n<title>".$newsfeed{$id.'_title'}."</title>\n<description>".
175: $newsfeed{$id.'_description'}."</description>\n<link>"."http://".$ENV{'HTTP_HOST'}.
176: $newsfeed{$id.'_link'}."</link>\n");
177: if ($newsfeed{$id.'_enclosureurl'}) {
178: $r->print("\n<enclosure url='".$newsfeed{$id.'_enclosureurl'}."' length='".$newsfeed{$id.'_enclosurelength'}.
179: "' type='".$newsfeed{$id.'_enclosuretype'}."' />");
180: }
181: $r->print("\n<guid isPermaLink='false'>".$id.$filterfeedname.'_'.$udom.'_'.$uname."</guid></item>\n");
182: }
183: }
184: }
185: $r->print("\n</channel></rss>\n");
186: return OK;
187: }
188:
189: 1;
190: __END__
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