1: # The LearningOnline Network
2: # RSS Feeder
3: #
4: # $Id: lonrss.pm,v 1.22 2006/05/11 17:50:52 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 LONCAPA;
33: use Apache::Constants qw(:common);
34: use Apache::loncommon;
35: use Apache::lonnet;
36: use Apache::lontexconvert;
37: use Apache::lonlocal;
38: use Apache::lonhtmlcommon;
39:
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',[$filterfilename,'feed_display_option_'.$filterfilename],$udom,$uname);
59: if ($stored{$filterfilename}) { return ($stored{$filterfilename},$stored{'feed_display_option_'.$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,$stored{'feed_display_option_'.$filterfilename});
71: }
72:
73: sub namefeed {
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 changefeeddisplay {
81: my ($rawname,$uname,$udom,$newstatus)=@_;
82: return &Apache::lonnet::put('nohist_all_rss_feeds',
83: { 'feed_display_option_'.&filterfeedname($rawname) => $newstatus },
84: $udom,$uname);
85: }
86:
87: sub advertisefeeds {
88: my ($uname,$udom,$edit)=@_;
89: my $feeds='';
90: my %feednames=&Apache::lonnet::dump('nohist_all_rss_feeds',$udom,$uname);
91: my $mode='public';
92: if ($edit) {
93: $mode='adm';
94: }
95: foreach my $feed (sort(keys(%feednames))) {
96: if (($feed!~/^error\:/) && ($feed!~/^feed\_display\_option\_/)) {
97: my $feedurl='http://'.$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.$feed.'.rss';
98: my $htmlurl='http://'.$ENV{'HTTP_HOST'}.'/'.$mode.'/'.$udom.'/'.$uname.'/'.$feed.'_rss.html';
99: if ($feednames{'feed_display_option_'.$feed} eq 'hidden') {
100: if ($edit) {
101: $feeds.='<li><i>'.$feednames{$feed}.'</i><br />'.&mt('Hidden').': <a href="'.$htmlurl.'"><tt>'.$htmlurl.'</tt></a></li>';
102: }
103: } else {
104: $feeds.='<li><b>'.$feednames{$feed}.
105: '</b><br />'.($edit?&mt('Edit'):'HTML').': <a href="'.$htmlurl.'"><tt>'.$htmlurl.'</tt></a>'.
106: '<br />RSS: <a href="'.$feedurl.'"><tt>'.$feedurl.'</tt></a></li>';
107: }
108: }
109: }
110: if ($feeds) {
111: return '<h4>'.&mt('Available RSS Feeds and Blogs').'</h4><ul>'.$feeds.'</ul>';
112: } else {
113: return '';
114: }
115: }
116:
117: sub rss_link {
118: my ($url) = @_;
119: return qq|<link rel="alternate" type="application/rss+xml" title="Course Announcements" href="$url" />|;
120: }
121:
122: {
123: my $feedcounter;
124: sub get_new_feed_id {
125: $feedcounter++;
126: return time().'00000'.$$.'00000'.$feedcounter;
127: }
128: }
129:
130: sub addentry {
131: my $id=&get_new_feed_id();
132: return &editentry($id,@_);
133: }
134:
135: sub editentry {
136: my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enctype)=@_;
137: if ($status eq 'deleted') {
138: return &changestatus($id,$uname,$udom,$filename,$status);
139: }
140: my $feedname=&feedname($filename);
141: &Apache::lonnet::put('nohist_all_rss_feeds',
142: { &filterfeedname($filename) => &displayfeedname($filename,$uname,$udom) },
143: $udom,$uname);
144: return &Apache::lonnet::put($feedname,{
145: $id.'_title' => $title,
146: $id.'_description' => $description,
147: $id.'_link' => $url,
148: $id.'_enclosureurl' => $encurl,
149: $id.'_enclosuretype' => $enctype,
150: $id.'_status' => $status},$udom,$uname);
151: }
152:
153: sub changestatus {
154: my ($id,$uname,$udom,$filename,$status)=@_;
155: my $feedname=&feedname($filename);
156: if ($status eq 'deleted') {
157: return &Apache::lonnet::del($feedname,[$id.'_title',
158: $id.'_description',
159: $id.'_link',
160: $id.'_enclosureurl',
161: $id.'_enclosuretype',
162: $id.'_status'],$udom,$uname);
163: } else {
164: return &Apache::lonnet::put($feedname,{$id.'_status' => $status},$udom,$uname);
165: }
166: }
167:
168: sub changed_js {
169: return <<ENDSCRIPT;
170: <script type="text/javascript">
171: function changed(tform,id) {
172: tform.elements[id+"_modified"].checked=true;
173: }
174: </script>
175: ENDSCRIPT
176: }
177:
178: sub determine_enclosure_types {
179: my ($url)=@_;
180: my ($ending)=($url=~/\.(\w+)$/);
181: return &Apache::loncommon::filemimetype($ending);
182: }
183:
184: sub course_blog_link {
185: my ($id,$title,$description,$url,$encurl,$enctype)=@_;
186: if ($env{'request.course.id'}) {
187: return &add_blog_entry_link($id,
188: $env{'course.'.$env{'request.course.id'}.'.num'},
189: $env{'course.'.$env{'request.course.id'}.'.domain'},
190: 'Course_Announcements',
191: $title,$description,$url,'public',$encurl,$enctype,
192: &mt('Add to Course Announcements'));
193: } else {
194: return '';
195: }
196: }
197:
198: sub add_blog_entry_link {
199: my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enctype,$linktext)=@_;
200: return "<a href='/adm/$udom/$uname/".&filterfeedname($filename).'_rss.html?queryid='.
201: &escape($id).
202: '&title='.&escape($title).
203: '&description='.&escape($description).
204: '&url='.&escape($url).
205: '&status='.&escape($status).
206: '&encurl='.&escape($encurl).
207: '&enctype='.&escape($enctype).
208: "'>".$linktext.'</a>';
209:
210: }
211:
212: sub handler {
213: my ($r) = @_;
214:
215: my $edit=0;
216: my $html=0;
217: my (undef,$mode,$udom,$uname,$filename)=split(/\//,$r->uri);
218: if (($mode eq 'adm') && ($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
219: $edit=1;
220: $html=1;
221: }
222: if (($mode eq 'adm') && (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
223: $edit=1;
224: $html=1;
225: }
226: if ($filename=~/\.html$/) {
227: $html=1;
228: }
229: if ($html) {
230: &Apache::loncommon::content_type($r,'text/html');
231: } else {
232: # Workaround Mozilla/Firefox
233: # &Apache::loncommon::content_type($r,'application/rss+xml');
234: &Apache::loncommon::content_type($r,'text/xml');
235: }
236: $r->send_http_header;
237: return OK if $r->header_only;
238:
239: my $filterfeedname=&filterfeedname($filename);
240: my $feedname=&feedname($filename);
241: my ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
242: if ($html) {
243: $r->print(&Apache::loncommon::start_page(($displayfeedname?$displayfeedname:&mt("Available RSS Feeds and Blogs")),undef,
244: {'domain' => $udom,
245: 'force_register' =>
246: $env{'form.register'}}).
247: &changed_js());
248: } else { # render RSS
249: $r->print("<rss version='2.0' xmlns:dc='http://purl.org/dc/elements/1.1'>\n<channel>".
250: "\n<link>http://".$ENV{'HTTP_HOST'}.'/public/'.$udom.'/'.$uname.'/'.
251: $filterfeedname.'_rss.html</link>'.
252: "\n<description>".
253: &mt('An RSS Feed provided by the LON-CAPA Learning Content Management System').
254: '</description>');
255: }
256: # This will be the entry id for new additions to the blog
257: my $newid = &get_new_feed_id();
258: # Is this user for real?
259: my $homeserver=&Apache::lonnet::homeserver($uname,$udom);
260: if ($html) {
261: # Any new feeds or renaming of feeds?
262: if ($edit) {
263: # Hide a feed?
264: if ($env{'form.hidethisblog'}) {
265: &changefeeddisplay($feedname,$uname,$udom,'hidden');
266: ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
267: }
268: # Advertise a feed?
269: if ($env{'form.advertisethisblog'}) {
270: &changefeeddisplay($feedname,$uname,$udom,'public');
271: ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
272: }
273: # New feed?
274: if ($env{'form.namenewblog'}=~/\w/) {
275: &namefeed($env{'form.namenewblog'},$uname,$udom,$env{'form.namenewblog'});
276: }
277: # Old feed that is being renamed?
278: if (($displayfeedname) && ($env{'form.newblogname'}=~/\w/)) {
279: if ($env{'form.newblogname'} ne $displayfeedname) {
280: &namefeed($feedname,$uname,$udom,$env{'form.newblogname'});
281: ($displayfeedname,$displayoption)=&displayfeedname($filename,$uname,$udom);
282: }
283: }
284: }
285: $r->print(&advertisefeeds($uname,$udom,$edit));
286: }
287: if ($homeserver eq 'no_host') {
288: $r->print(($html?'<h3>':'<title>').&mt('No feed available').($html?'</h3>':'</title>'));
289: } else { # is indeed a user
290: # Course or user?
291: my $name='';
292: if ($uname=~/^\d/) {
293: my %cenv=&Apache::lonnet::dump('environment',$udom,$uname);
294: $name=$cenv{'description'};
295: } else {
296: $name=&Apache::loncommon::nickname($uname,$udom);
297: }
298: # Add a new feed
299: if (($html) && ($edit)) {
300: $r->print('<form method="post">');
301: $r->print(&mt('Name for New Feed').": <input type='text' size='40' name='namenewblog' />");
302: $r->print('<input type="submit" value="'.&mt('Start a New Feed').'" />');
303: $r->print('</form>');
304: }
305: if ($displayfeedname) { # this is an existing feed
306: # Anything to store?
307: if ($edit) {
308: # check if this was called with a query string
309: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['queryid']);
310: if ($env{'form.queryid'}) {
311: # yes, collect the remainder
312: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
313: ['title',
314: 'description',
315: 'url',
316: 'status',
317: 'enclosureurl',
318: 'enclosuretype']);
319: # my ($id,$uname,$udom,$filename,$title,$description,$url,$status,$encurl,$enctype)=@_;
320:
321: &editentry($env{'form.queryid'},
322: $uname,$udom,$filename,
323: $env{'form.title'},
324: $env{'form.description'},
325: $env{'form.url'},
326: $env{'form.status'},
327: $env{'form.encurl'},
328: $env{'form.enctype'}
329: );
330: }
331: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
332: foreach my $entry (sort(keys(%newsfeed)),$env{'form.newid'}.'_status') {
333: if ($entry=~/^(\d+)\_status$/) {
334: my $id=$1;
335: if ($env{'form.'.$id.'_modified'}) {
336: &editentry($id,$uname,$udom,$feedname,
337: $env{'form.'.$id.'_title'},
338: $env{'form.'.$id.'_description'},
339: $env{'form.'.$id.'_url'},
340: $env{'form.'.$id.'_status'},
341: $env{'form.'.$id.'_enclosureurl'},
342: $env{'form.'.$id.'_enclosuretype'},
343: );
344: }
345: }
346: }
347: } #done storing
348:
349: $r->print("\n".
350: ($html?'<hr /><h3>':'<title>').
351: &mt('LON-CAPA Feed "[_1]" for [_2]',$displayfeedname,$name).
352: ($displayoption eq 'hidden'?' ('.&mt('Hidden').')':'').
353: ($html?'</h3>'.($edit?'<form method="post"><br />'.
354: &mt('Name of this Feed').
355: ': <input type="text" size="50" name="newblogname" value="'.
356: $displayfeedname.'" />':'').'<ul>':'</title>'));
357: # Render private items?
358: my $viewpubliconly=1;
359: if (($env{'user.name'} eq $uname) && ($env{'user.domain'} eq $udom)) {
360: $viewpubliconly=0;
361: }
362: # Get feed items
363: my %newsfeed=&Apache::lonnet::dump($feedname,$udom,$uname);
364: foreach my $entry (sort(keys(%newsfeed)),$newid.'_status') {
365: if ($entry=~/^(\d+)\_status$/) { # is an entry
366: my $id=$1;
367: if ($edit) {
368: my %lt=&Apache::lonlocal::texthash('public' => 'public',
369: 'private' => 'private',
370: 'hidden' => 'hidden',
371: 'delete' => 'delete',
372: 'store' => 'Store changes',
373: 'title' => 'Title',
374: 'link' => 'Link',
375: 'description' => 'Description');
376: my %status=();
377: unless ($newsfeed{$id.'_status'}) { $newsfeed{$id.'_status'}='public'; }
378: $status{$newsfeed{$id.'_status'}}='checked="checked"';
379: $r->print(<<ENDEDIT);
380: <li>
381: <label><input name='$id\_modified' type='checkbox' value="modified" /> $lt{'store'}</label>
382:
383: <label><input name='$id\_status' type="radio" value="public" $status{'public'} onClick="changed(this.form,'$id');" /> $lt{'public'}</label>
384:
385: <label><input name='$id\_status' type="radio" value="private" $status{'private'} onClick="changed(this.form,'$id');" /> $lt{'private'}</label>
386:
387: <label><input name='$id\_status' type="radio" value="hidden" $status{'hidden'} onClick="changed(this.form,'$id');" /> $lt{'hidden'}</label>
388:
389: <label><input name='$id\_status' type="radio" value="deleted" onClick="changed(this.form,'$id');" /> $lt{'delete'}</label>
390: <br />
391: $lt{'title'}:
392: <input name='$id\_title' type='text' size='60' value='$newsfeed{$id.'_title'}' onChange="changed(this.form,'$id');" /><br />
393: $lt{'description'}:<br />
394: <textarea name='$id\_description' rows="6" cols="80" onChange="changed(this.form,'$id');">$newsfeed{$id.'_description'}</textarea><br />
395: $lt{'link'}:
396: <input name='$id\_link' type='text' size='60' value='$newsfeed{$id.'_link'}' onChange="changed(this.form,'$id');" />
397: <hr /></li>
398: ENDEDIT
399: } else { # not in edit mode, just displaying
400: if (($newsfeed{$id.'_status'} ne 'public') && ($viewpubliconly)) { next; }
401: if ($newsfeed{$id.'_status'} eq 'hidden') { next; }
402: $r->print("\n".($html?"\n<li><b>":"<item>\n<title>").$newsfeed{$id.'_title'}.
403: ($html?"</b><br />\n":"</title>\n<description>").
404: $newsfeed{$id.'_description'}.
405: ($html?"<br />\n<a href='":"</description>\n<link>").
406: "http://".$ENV{'HTTP_HOST'}.
407: $newsfeed{$id.'_link'}.
408: ($html?("'>".&mt('Read more')."</a><br />\n"):"</link>\n"));
409: # Enclosure? Get stats
410: if ($newsfeed{$id.'_enclosureurl'}) {
411: my @stat=&Apache::lonnet::stat_file($newsfeed{$id.'_enclosureurl'});
412: if ($stat[7]) {
413: # Has non-zero length (and exists)
414: my $enclosuretype=$newsfeed{$id.'_enclosetype'};
415: $r->print(($html?"<a href='":"\n<enclosure url='").
416: $newsfeed{$id.'_enclosureurl'}."' length='".$stat[7].
417: "' type='".$enclosuretype.($html?"'>".&mt('Enclosure')."</a>":"' />"));
418: }
419: }
420: if ($html) { # is HTML
421: $r->print("\n<hr /></li>\n");
422: } else { # is RSS
423: $r->print("\n<guid isPermaLink='false'>".$id.$filterfeedname.'_'.$udom.'_'.$uname."</guid></item>\n");
424: }
425: } # end of "in edit mode"
426: } # end of rendering a real entry
427: } # end of loop through all keys
428: if ($html) {
429: $r->print('</ul>');
430: if ($edit) {
431: $r->print('<input type="hidden" name="newid" value="'.$newid.'"/><input type="submit" value="'.&mt('Store Marked Changes').'" />'.
432: ($displayoption eq 'hidden'?'<input type="submit" name="advertisethisblog" value="'.&mt('Advertise this Feed').'" />':
433: '<input type="submit" name="hidethisblog" value="'.&mt('Hide this Feed').'" />'));
434: }
435: }
436: } # was a real display feedname
437: $r->print(($html?'</form>'.&Apache::loncommon::end_page():'</channel></rss>'."\n"));
438: } # a real user
439: return OK;
440: } # end handler
441: 1;
442: __END__
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