1: # The LearningOnline Network
2: # RSS Feeder
3: #
4: # $Id: lonrss.pm,v 1.21 2006/05/11 17:38:44 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:
40: sub filterfeedname {
41: my $filename=shift;
42: $filename=~s/(\_rss\.html|\.rss)$//;
43: $filename=~s/\W//g;
44: $filename=~s/\_rssfeed$//;
45: $filename=~s/^nohist\_//;
46: return $filename;
47: }
48:
49: sub feedname {
50: return 'nohist_'.&filterfeedname(shift).'_rssfeed';
51: }
52:
53: sub displayfeedname {
54: my ($rawname,$uname,$udom)=@_;
55: my $filterfilename=&filterfeedname($rawname);
56: # do we have a stored name?
57: my %stored=&Apache::lonnet::get('nohist_all_rss_feeds',[$filterfilename,'feed_display_option_'.$filterfilename],$udom,$uname);
58: if ($stored{$filterfilename}) { return ($stored{$filterfilename},$stored{'feed_display_option_'.$filterfilename}); }
59: # no, construct a name
60: my $name=$filterfilename;
61: if ($name=~/^CourseBlog/) {
62: $name=&mt('Course Blog');
63: if ($env{'course.'.$env{'request.course.id'}.'.description'}) {
64: $name.=' '.$env{'course.'.$env{'request.course.id'}.'.description'};
65: }
66: } else {
67: $name=~s/\_/ /g;
68: }
69: return ($name,$stored{'feed_display_option_'.$filterfilename});
70: }
71:
72: sub namefeed {
73: my ($rawname,$uname,$udom,$newname)=@_;
74: return &Apache::lonnet::put('nohist_all_rss_feeds',
75: { &filterfeedname($rawname) => $newname },
76: $udom,$uname);
77: }
78:
79: sub changefeeddisplay {
80: my ($rawname,$uname,$udom,$newstatus)=@_;
81: return &Apache::lonnet::put('nohist_all_rss_feeds',
82: { 'feed_display_option_'.&filterfeedname($rawname) => $newstatus },
83: $udom,$uname);
84: }
85:
86: sub advertisefeeds {
87: my ($uname,$udom,$edit)=@_;
88: my $feeds='';
89: my %feednames=&Apache::lonnet::dump('nohist_all_rss_feeds',$udom,$uname);
90: my $mode='public';
91: if ($edit) {
92: $mode='adm';
93: }
94: foreach my $feed (sort(keys(%feednames))) {
95: if (($feed!~/^error\:/) && ($feed!~/^feed\_display\_option\_/)) {
96: my $feedurl='http://'.$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.$feed.'.rss';
97: my $htmlurl='http://'.$ENV{'HTTP_HOST'}.'/'.$mode.'/'.$udom.'/'.$uname.'/'.$feed.'_rss.html';
98: if ($feednames{'feed_display_option_'.$feed} eq 'hidden') {
99: if ($edit) {
100: $feeds.='<li><i>'.$feednames{$feed}.'</i><br />'.&mt('Hidden').': <a href="'.$htmlurl.'"><tt>'.$htmlurl.'</tt></a></li>';
101: }
102: } else {
103: $feeds.='<li><b>'.$feednames{$feed}.
104: '</b><br />'.($edit?&mt('Edit'):'HTML').': <a href="'.$htmlurl.'"><tt>'.$htmlurl.'</tt></a>'.
105: '<br />RSS: <a href="'.$feedurl.'"><tt>'.$feedurl.'</tt></a></li>';
106: }
107: }
108: }
109: if ($feeds) {
110: return '<h4>'.&mt('Available RSS Feeds and Blogs').'</h4><ul>'.$feeds.'</ul>';
111: } else {
112: return '';
113: }
114: }
115:
116: sub rss_link {
117: my ($url) = @_;
118: return qq|<link rel="alternate" type="application/rss+xml" title="Course Announcements" href="$url" />|;
119: }
120:
121: {
122: my $feedcounter;
123: sub get_new_feed_id {
124: $feedcounter++;
125: return time().'00000'.$$.'00000'.$feedcounter;
126: }
127: }
128:
129: sub addentry {
130: my $id=&get_new_feed_id();
131: return &editentry($id,@_);
132: }
133:
134: sub editentry {
135: my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enctype)=@_;
136: if ($status eq 'deleted') {
137: return &changestatus($id,$uname,$udom,$filename,$status);
138: }
139: my $feedname=&feedname($filename);
140: &Apache::lonnet::put('nohist_all_rss_feeds',
141: { &filterfeedname($filename) => &displayfeedname($filename,$uname,$udom) },
142: $udom,$uname);
143: return &Apache::lonnet::put($feedname,{
144: $id.'_title' => $title,
145: $id.'_description' => $description,
146: $id.'_link' => $url,
147: $id.'_enclosureurl' => $encurl,
148: $id.'_enclosuretype' => $enctype,
149: $id.'_status' => $status},$udom,$uname);
150: }
151:
152: sub changestatus {
153: my ($id,$uname,$udom,$filename,$status)=@_;
154: my $feedname=&feedname($filename);
155: if ($status eq 'deleted') {
156: return &Apache::lonnet::del($feedname,[$id.'_title',
157: $id.'_description',
158: $id.'_link',
159: $id.'_enclosureurl',
160: $id.'_enclosuretype',
161: $id.'_status'],$udom,$uname);
162: } else {
163: return &Apache::lonnet::put($feedname,{$id.'_status' => $status},$udom,$uname);
164: }
165: }
166:
167: sub changed_js {
168: return <<ENDSCRIPT;
169: <script type="text/javascript">
170: function changed(tform,id) {
171: tform.elements[id+"_modified"].checked=true;
172: }
173: </script>
174: ENDSCRIPT
175: }
176:
177: sub determine_enclosure_types {
178: my ($url)=@_;
179: my ($ending)=($url=~/\.(\w+)$/);
180: return &Apache::loncommon::filemimetype($ending);
181: }
182:
183: sub course_blog_link {
184: my ($id,$title,$description,$url,$encurl,$enctype)=@_;
185: if ($env{'request.course.id'}) {
186: return &add_blog_entry_link($id,
187: $env{'course.'.$env{'request.course.id'}.'.num'},
188: $env{'course.'.$env{'request.course.id'}.'.domain'},
189: 'Course_Announcements',
190: $title,$description,$url,'public',$encurl,$enctype,
191: &mt('Add to Course Announcements'));
192: } else {
193: return '';
194: }
195: }
196:
197: sub add_blog_entry_link {
198: my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enctype,$linktext)=@_;
199: return "<a href='/adm/$udom/$uname/".&filterfeedname($filename).'_rss.html?queryid='.
200: &Apache::lonnet::escape($id).
201: '&title='.&Apache::lonnet::escape($title).
202: '&description='.&Apache::lonnet::escape($description).
203: '&url='.&Apache::lonnet::escape($url).
204: '&status='.&Apache::lonnet::escape($status).
205: '&encurl='.&Apache::lonnet::escape($encurl).
206: '&enctype='.&Apache::lonnet::escape($enctype).
207: "'>".$linktext.'</a>';
208:
209: }
210:
211: sub handler {
212: my ($r) = @_;
213:
214: my $edit=0;
215: my $html=0;
216: my (undef,$mode,$udom,$uname,$filename)=split(/\//,$r->uri);
217: if (($mode eq 'adm') && ($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
218: $edit=1;
219: $html=1;
220: }
221: if (($mode eq 'adm') && (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
222: $edit=1;
223: $html=1;
224: }
225: if ($filename=~/\.html$/) {
226: $html=1;
227: }
228: if ($html) {
229: &Apache::loncommon::content_type($r,'text/html');
230: } else {
231: # Workaround Mozilla/Firefox
232: # &Apache::loncommon::content_type($r,'application/rss+xml');
233: &Apache::loncommon::content_type($r,'text/xml');
234: }
235: $r->send_http_header;
236: return OK if $r->header_only;
237:
238: my $filterfeedname=&filterfeedname($filename);
239: my $feedname=&feedname($filename);
240: my ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
241: if ($html) {
242: $r->print(&Apache::loncommon::start_page(($displayfeedname?$displayfeedname:&mt("Available RSS Feeds and Blogs")),undef,
243: {'domain' => $udom,
244: 'force_register' =>
245: $env{'form.register'}}).
246: &changed_js());
247: } else { # render RSS
248: $r->print("<rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1'>\n<channel>".
249: "\n<link>http://".$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.
250: $filterfeedname.'_rss.html</link>'.
251: "\n<description>".
252: &mt('An RSS Feed provided by the LON-CAPA Learning Content Management System').
253: '</description>');
254: }
255: # This will be the entry id for new additions to the blog
256: my $newid = &get_new_feed_id();
257: # Is this user for real?
258: my $homeserver=&Apache::lonnet::homeserver($uname,$udom);
259: if ($html) {
260: # Any new feeds or renaming of feeds?
261: if ($edit) {
262: # Hide a feed?
263: if ($env{'form.hidethisblog'}) {
264: &changefeeddisplay($feedname,$uname,$udom,'hidden');
265: ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
266: }
267: # Advertise a feed?
268: if ($env{'form.advertisethisblog'}) {
269: &changefeeddisplay($feedname,$uname,$udom,'public');
270: ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
271: }
272: # New feed?
273: if ($env{'form.namenewblog'}=~/\w/) {
274: &namefeed($env{'form.namenewblog'},$uname,$udom,$env{'form.namenewblog'});
275: }
276: # Old feed that is being renamed?
277: if (($displayfeedname) && ($env{'form.newblogname'}=~/\w/)) {
278: if ($env{'form.newblogname'} ne $displayfeedname) {
279: &namefeed($feedname,$uname,$udom,$env{'form.newblogname'});
280: ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
281: }
282: }
283: }
284: $r->print(&advertisefeeds($uname,$udom,$edit));
285: }
286: if ($homeserver eq 'no_host') {
287: $r->print(($html?'<h3>':'<title>').&mt('No feed available').($html?'</h3>':'</title>'));
288: } else { # is indeed a user
289: # Course or user?
290: my $name='';
291: if ($uname=~/^\d/) {
292: my %cenv=&Apache::lonnet::dump('environment',$udom,$uname);
293: $name=$cenv{'description'};
294: } else {
295: $name=&Apache::loncommon::nickname($uname,$udom);
296: }
297: # Add a new feed
298: if (($html) && ($edit)) {
299: $r->print('<form method="post">');
300: $r->print(&mt('Name for New Feed').": <input type='text' size='40' name='namenewblog' />");
301: $r->print('<input type="submit" value="'.&mt('Start a New Feed').'" />');
302: $r->print('</form>');
303: }
304: if ($displayfeedname) { # this is an existing feed
305: # Anything to store?
306: if ($edit) {
307: # check if this was called with a query string
308: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['queryid']);
309: if ($env{'form.queryid'}) {
310: # yes, collect the remainder
311: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
312: ['title',
313: 'description',
314: 'url',
315: 'status',
316: 'enclosureurl',
317: 'enclosuretype']);
318: # my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enctype)=@_;
319:
320: &editentry($env{'form.queryid'},
321: $uname,$udom,$filename,
322: $env{'form.title'},
323: $env{'form.description'},
324: $env{'form.url'},
325: $env{'form.status'},
326: $env{'form.encurl'},
327: $env{'form.enctype'}
328: );
329: }
330: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
331: foreach my $entry (sort(keys(%newsfeed)),$env{'form.newid'}.'_status') {
332: if ($entry=~/^(\d+)\_status$/) {
333: my $id=$1;
334: if ($env{'form.'.$id.'_modified'}) {
335: &editentry($id,$uname,$udom,$feedname,
336: $env{'form.'.$id.'_title'},
337: $env{'form.'.$id.'_description'},
338: $env{'form.'.$id.'_url'},
339: $env{'form.'.$id.'_status'},
340: $env{'form.'.$id.'_enclosureurl'},
341: $env{'form.'.$id.'_enclosuretype'},
342: );
343: }
344: }
345: }
346: } #done storing
347:
348: $r->print("\n".
349: ($html?'<hr /><h3>':'<title>').
350: &mt('LON-CAPA Feed "[_1]" for [_2]',$displayfeedname,$name).
351: ($displayoption eq 'hidden'?' ('.&mt('Hidden').')':'').
352: ($html?'</h3>'.($edit?'<form method="post"><br />'.
353: &mt('Name of this Feed').
354: ': <input type="text" size="50" name="newblogname" value="'.
355: $displayfeedname.'" />':'').'<ul>':'</title>'));
356: # Render private items?
357: my $viewpubliconly=1;
358: if (($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
359: $viewpubliconly=0;
360: }
361: # Get feed items
362: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
363: foreach my $entry (sort(keys(%newsfeed)),$newid.'_status') {
364: if ($entry=~/^(\d+)\_status$/) { # is an entry
365: my $id=$1;
366: if ($edit) {
367: my %lt=&Apache::lonlocal::texthash('public' => 'public',
368: 'private' => 'private',
369: 'hidden' => 'hidden',
370: 'delete' => 'delete',
371: 'store' => 'Store changes',
372: 'title' => 'Title',
373: 'link' => 'Link',
374: 'description' => 'Description');
375: my %status=();
376: unless ($newsfeed{$id.'_status'}) { $newsfeed{$id.'_status'}='public'; }
377: $status{$newsfeed{$id.'_status'}}='checked="checked"';
378: $r->print(<<ENDEDIT);
379: <li>
380: <label><input name='$id\_modified' type='checkbox' value="modified" /> $lt{'store'}</label>
381:
382: <label><input name='$id\_status' type="radio" value="public" $status{'public'} onClick="changed(this.form,'$id');" /> $lt{'public'}</label>
383:
384: <label><input name='$id\_status' type="radio" value="private" $status{'private'} onClick="changed(this.form,'$id');" /> $lt{'private'}</label>
385:
386: <label><input name='$id\_status' type="radio" value="hidden" $status{'hidden'} onClick="changed(this.form,'$id');" /> $lt{'hidden'}</label>
387:
388: <label><input name='$id\_status' type="radio" value="deleted" onClick="changed(this.form,'$id');" /> $lt{'delete'}</label>
389: <br />
390: $lt{'title'}:
391: <input name='$id\_title' type='text' size='60' value='$newsfeed{$id.'_title'}' onChange="changed(this.form,'$id');" /><br />
392: $lt{'description'}:<br />
393: <textarea name='$id\_description' rows="6" cols="80" onChange="changed(this.form,'$id');">$newsfeed{$id.'_description'}</textarea><br />
394: $lt{'link'}:
395: <input name='$id\_link' type='text' size='60' value='$newsfeed{$id.'_link'}' onChange="changed(this.form,'$id');" />
396: <hr /></li>
397: ENDEDIT
398: } else { # not in edit mode, just displaying
399: if (($newsfeed{$id.'_status'} ne 'public') && ($viewpubliconly)) { next; }
400: if ($newsfeed{$id.'_status'} eq 'hidden') { next; }
401: $r->print("\n".($html?"\n<li><b>":"<item>\n<title>").$newsfeed{$id.'_title'}.
402: ($html?"</b><br />\n":"</title>\n<description>").
403: $newsfeed{$id.'_description'}.
404: ($html?"<br />\n<a href='":"</description>\n<link>").
405: "http://".$ENV{'HTTP_HOST'}.
406: $newsfeed{$id.'_link'}.
407: ($html?("'>".&mt('Read more')."</a><br />\n"):"</link>\n"));
408: # Enclosure? Get stats
409: if ($newsfeed{$id.'_enclosureurl'}) {
410: my @stat=&Apache::lonnet::stat_file($newsfeed{$id.'_enclosureurl'});
411: if ($stat[7]) {
412: # Has non-zero length (and exists)
413: my $enclosuretype=$newsfeed{$id.'_enclosetype'};
414: $r->print(($html?"<a href='":"\n<enclosure url='").
415: $newsfeed{$id.'_enclosureurl'}."' length='".$stat[7].
416: "' type='".$enclosuretype.($html?"'>".&mt('Enclosure')."</a>":"' />"));
417: }
418: }
419: if ($html) { # is HTML
420: $r->print("\n<hr /></li>\n");
421: } else { # is RSS
422: $r->print("\n<guid isPermaLink='false'>".$id.$filterfeedname.'_'.$udom.'_'.$uname."</guid></item>\n");
423: }
424: } # end of "in edit mode"
425: } # end of rendering a real entry
426: } # end of loop through all keys
427: if ($html) {
428: $r->print('</ul>');
429: if ($edit) {
430: $r->print('<input type="hidden" name="newid" value="'.$newid.'"/><input type="submit" value="'.&mt('Store Marked Changes').'" />'.
431: ($displayoption eq 'hidden'?'<input type="submit" name="advertisethisblog" value="'.&mt('Advertise this Feed').'" />':
432: '<input type="submit" name="hidethisblog" value="'.&mt('Hide this Feed').'" />'));
433: }
434: }
435: } # was a real display feedname
436: $r->print(($html?'</form>'.&Apache::loncommon::end_page():'</channel></rss>'."\n"));
437: } # a real user
438: return OK;
439: } # end handler
440: 1;
441: __END__
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