1: # The LearningOnline Network
2: # RSS Feeder
3: #
4: # $Id: lonrss.pm,v 1.15 2006/04/13 17:57:17 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: my $feedcounter;
40:
41: sub filterfeedname {
42: my $filename=shift;
43: $filename=~s/(\_rss\.html|\.rss)$//;
44: $filename=~s/\W//g;
45: $filename=~s/\_rssfeed$//;
46: $filename=~s/^nohist\_//;
47: return $filename;
48: }
49:
50: sub feedname {
51: return 'nohist_'.&filterfeedname(shift).'_rssfeed';
52: }
53:
54: sub displayfeedname {
55: my ($rawname,$uname,$udom)=@_;
56: my $filterfilename=&filterfeedname($rawname);
57: # do we have a stored name?
58: my %stored=&Apache::lonnet::get('nohist_all_rss_feeds',[$filterfilename],$udom,$uname);
59: if ($stored{$filterfilename}) { return $stored{$filterfilename}; }
60: # no, construct a name
61: my $name=$filterfilename;
62: if ($name=~/^CourseBlog/) {
63: $name=&mt('Course Blog');
64: if ($env{'course.'.$env{'request.course.id'}.'.description'}) {
65: $name.=' '.$env{'course.'.$env{'request.course.id'}.'.description'};
66: }
67: } else {
68: $name=~s/\_/ /g;
69: }
70: return $name;
71: }
72:
73: sub renamefeed {
74: my ($rawname,$uname,$udom,$newname)=@_;
75: return &Apache::lonnet::put('nohist_all_rss_feeds',
76: { &filterfeedname($rawname) => $newname },
77: $udom,$uname);
78: }
79:
80: sub advertisefeeds {
81: my ($uname,$udom,$edit)=@_;
82: my $feeds='';
83: my %feednames=&Apache::lonnet::dump('nohist_all_rss_feeds',$udom,$uname);
84: my $mode='public';
85: if ($edit) {
86: $mode='adm';
87: }
88: foreach my $feed (sort(keys(%feednames))) {
89: if ($feed!~/^error\:/) {
90: my $feedurl='http://'.$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.$feed.'.rss';
91: my $htmlurl='http://'.$ENV{'HTTP_HOST'}.'/'.$mode.'/'.$udom.'/'.$uname.'/'.$feed.'_rss.html';
92: $feeds.='<li>'.$feednames{$feed}.
93: '<br />'.($edit?&mt('Edit'):'HTML').': <a href="'.$htmlurl.'"><tt>'.$htmlurl.'</tt></a>'.
94: ($edit?'':'<br />RSS: <a href="'.$feedurl.'"><tt>'.$feedurl.'</tt></a>').'</li>';
95: }
96: }
97: if ($feeds) {
98: return '<h4>'.&mt('Available RSS Feeds and Blogs').'</h4><ul>'.$feeds.'</ul>';
99: } else {
100: return '';
101: }
102: }
103:
104: sub rss_link {
105: my ($url) = @_;
106: return qq|<link rel="alternate" type="application/rss+xml" title="Course Announcements" href="$url" />|;
107: }
108:
109: sub addentry {
110: $feedcounter++;
111: my $id=time.'00000'.$$.'00000'.$feedcounter;
112: return &editentry($id,@_);
113: }
114:
115: sub editentry {
116: my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enclength,$enctype)=@_;
117: if ($status eq 'deleted') {
118: return &changestatus($id,$uname,$udom,$filename,$status);
119: }
120: my $feedname=&feedname($filename);
121: &Apache::lonnet::put('nohist_all_rss_feeds',
122: { &filterfeedname($filename) => &displayfeedname($filename,$uname,$udom) },
123: $udom,$uname);
124: return &Apache::lonnet::put($feedname,{
125: $id.'_title' => $title,
126: $id.'_description' => $description,
127: $id.'_link' => $url,
128: $id.'_enclosureurl' => $encurl,
129: $id.'_enclosurelength' => $enclength,
130: $id.'_enclosuretype' => $enctype,
131: $id.'_status' => $status},$udom,$uname);
132: }
133:
134: sub changestatus {
135: my ($id,$uname,$udom,$filename,$status)=@_;
136: my $feedname=&feedname($filename);
137: if ($status eq 'deleted') {
138: return &Apache::lonnet::del($feedname,[$id.'_title',
139: $id.'_description',
140: $id.'_link',
141: $id.'_enclosureurl',
142: $id.'_enclosurelength',
143: $id.'_enclosuretype',
144: $id.'_status'],$udom,$uname);
145: } else {
146: return &Apache::lonnet::put($feedname,{$id.'_status' => $status},$udom,$uname);
147: }
148: }
149:
150: sub changed_js {
151: return <<ENDSCRIPT;
152: <script type="text/javascript">
153: function changed(tform,id) {
154: tform.elements[id+"_modified"].checked=true;
155: }
156: </script>
157: ENDSCRIPT
158: }
159:
160: sub handler {
161: my ($r) = @_;
162:
163: my $edit=0;
164: my $html=0;
165: my (undef,$mode,$udom,$uname,$filename)=split(/\//,$r->uri);
166: if (($mode eq 'adm') && ($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
167: $edit=1;
168: $html=1;
169: }
170: if ($filename=~/\.html$/) {
171: $html=1;
172: }
173: if ($html) {
174: &Apache::loncommon::content_type($r,'text/html');
175: } else {
176: # Workaround Mozilla/Firefox
177: # &Apache::loncommon::content_type($r,'application/rss+xml');
178: &Apache::loncommon::content_type($r,'text/xml');
179: }
180: $r->send_http_header;
181: return OK if $r->header_only;
182:
183: my $filterfeedname=&filterfeedname($filename);
184: my $feedname=&feedname($filename);
185: my $displayfeedname=&displayfeedname($filename,$uname,$udom);
186: if ($html) {
187: $r->print(&Apache::loncommon::start_page($displayfeedname,undef,
188: {'domain' => $udom,
189: 'force_register' =>
190: $env{'form.register'}}).
191: &changed_js());
192: } else {
193: $r->print("<rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1'>\n<channel>".
194: "\n<link>http://".$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.
195: $filterfeedname.'_rss.html</link>'.
196: "\n<description>".
197: &mt('An RSS Feed provided by the LON-CAPA Learning Content Management System').
198: '</description>');
199: }
200: # Do we have stuff to store?
201: if ($edit) {
202: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
203: foreach my $entry (sort(keys(%newsfeed)),$env{'form.newid'}.'_status') {
204: if ($entry=~/^(\d+)\_status$/) {
205: my $id=$1;
206: if ($env{'form.'.$id.'_modified'}) {
207: &editentry($id,$uname,$udom,$feedname,
208: $env{'form.'.$id.'_title'},
209: $env{'form.'.$id.'_description'},
210: $env{'form.'.$id.'_url'},
211: $env{'form.'.$id.'_status'});
212: }
213: }
214: }
215: }
216: $feedcounter++;
217: my $newid=time.'00000'.$$.'00000'.$feedcounter;
218: # Is this user for real?
219: my $homeserver=&Apache::lonnet::homeserver($uname,$udom);
220: if ($html) {
221: $r->print(&advertisefeeds($uname,$udom,$edit));
222: }
223: if ($homeserver eq 'no_host') {
224: $r->print(($html?'<h3>':'<title>').&mt('No feed available').($html?'</h3>':'</title>'));
225: } else {
226: # Course or user?
227: my $name='';
228: if ($uname=~/^\d/) {
229: my %cenv=&Apache::lonnet::dump('environment',$udom,$uname);
230: $name=$cenv{'description'};
231: } else {
232: $name=&Apache::loncommon::nickname($uname,$udom);
233: }
234: $r->print("\n".
235: ($html?'<h3>':'<title>').
236: &mt('LON-CAPA Feed "[_1]" for [_2]',$displayfeedname,$name).
237: ($html?'</h3>'.($edit?'<form method="post"><br />'.
238: &mt('Name of blog/journal').
239: ': <input type="text" size="50" name="newblogname" value="'.
240: $displayfeedname.'" />':'').'<ul>':'</title>'));
241: # Render private items?
242: my $viewpubliconly=1;
243: if (($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
244: $viewpubliconly=0;
245: }
246: # Get feed items
247: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
248: foreach my $entry (sort(keys(%newsfeed)),$newid.'_status') {
249: if ($entry=~/^(\d+)\_status$/) {
250: my $id=$1;
251: if ($edit) {
252: my %lt=&Apache::lonlocal::texthash('public' => 'public',
253: 'private' => 'private',
254: 'hidden' => 'hidden',
255: 'delete' => 'delete',
256: 'store' => 'Store changes');
257: my %status=();
258: unless ($newsfeed{$id.'_status'}) { $newsfeed{$id.'_status'}='public'; }
259: $status{$newsfeed{$id.'_status'}}='checked="checked"';
260: $r->print(<<ENDEDIT);
261: <li>
262: <label><input name='$id\_modified' type='checkbox' value="modified" /> $lt{'store'}</label>
263:
264: <label><input name='$id\_status' type="radio" value="public" $status{'public'} onClick="changed(this.form,'$id');" /> $lt{'public'}</label>
265:
266: <label><input name='$id\_status' type="radio" value="private" $status{'private'} onClick="changed(this.form,'$id');" /> $lt{'private'}</label>
267:
268: <label><input name='$id\_status' type="radio" value="hidden" $status{'hidden'} onClick="changed(this.form,'$id');" /> $lt{'hidden'}</label>
269:
270: <label><input name='$id\_status' type="radio" value="deleted" onClick="changed(this.form,'$id');" /> $lt{'delete'}</label>
271: <br />
272: <input name='$id\_title' type='text' size='80' value='$newsfeed{$id.'_title'}' onChange="changed(this.form,'$id');" /><br />
273: <textarea name='$id\_description' rows="6" cols="80" onChange="changed(this.form,'$id');">$newsfeed{$id.'_description'}</textarea><br />
274: <input name='$id\_link' type='text' size='80' value='$newsfeed{$id.'_link'}' onChange="changed(this.form,'$id');" />
275: <hr /></li>
276: ENDEDIT
277: } else {
278: if (($newsfeed{$id.'_status'} ne 'public') && ($viewpubliconly)) { next; }
279: if ($newsfeed{$id.'_status'} eq 'hidden') { next; }
280: $r->print("\n".($html?"\n<li><b>":"<item>\n<title>").$newsfeed{$id.'_title'}.
281: ($html?"</b><br />\n":"</title>\n<description>").
282: $newsfeed{$id.'_description'}.
283: ($html?"<br />\n<a href='":"</description>\n<link>").
284: "http://".$ENV{'HTTP_HOST'}.
285: $newsfeed{$id.'_link'}.
286: ($html?("'>".&mt('Read more')."</a><br />\n"):"</link>\n"));
287: if ($newsfeed{$id.'_enclosureurl'}) {
288: $r->print(($html?"<a href='":"\n<enclosure url='").
289: $newsfeed{$id.'_enclosureurl'}."' length='".$newsfeed{$id.'_enclosurelength'}.
290: "' type='".$newsfeed{$id.'_enclosuretype'}.($html?"'>".&mt('Enclosure')."</a>":"' />"));
291: }
292: if ($html) {
293: $r->print("\n<hr /></li>\n");
294: } else {
295: $r->print("\n<guid isPermaLink='false'>".$id.$filterfeedname.'_'.$udom.'_'.$uname."</guid></item>\n");
296: }
297: }
298: }
299: }
300: }
301: $r->print("\n".($html?'</ul>'.($edit?'<input type="hidden" name="newid" value="'.$newid.'"/><input type="submit" value="'.&mt('Store Marked Changes').'" /></form>':'').&Apache::loncommon::end_page():'</channel></rss>'."\n"));
302: return OK;
303: }
304: 1;
305: __END__
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