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[LON-CAPA] /
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lonsequence.pm
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Thu May 23 10:19:30 2002 UTC (22 years, 4 months ago) by
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Selection of resources from sequences for RAT should be done out of
resource space - moved code for that from lonratedt
Starting to work on viewing of sequences out of course context
1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.8 2002/05/23 10:19:30 www Exp $
6: #
7: # Copyright Michigan State University Board of Trustees
8: #
9: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
10: #
11: # LON-CAPA is free software; you can redistribute it and/or modify
12: # it under the terms of the GNU General Public License as published by
13: # the Free Software Foundation; either version 2 of the License, or
14: # (at your option) any later version.
15: #
16: # LON-CAPA is distributed in the hope that it will be useful,
17: # but WITHOUT ANY WARRANTY; without even the implied warranty of
18: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19: # GNU General Public License for more details.
20: #
21: # You should have received a copy of the GNU General Public License
22: # along with LON-CAPA; if not, write to the Free Software
23: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24: #
25: # /home/httpd/html/adm/gpl.txt
26: #
27: # http://www.lon-capa.org/
28: #
29: # (Handler to resolve ambiguous file locations
30: #
31: # (TeX Content Handler
32: #
33: # 05/29/00,05/30,10/11 Gerd Kortemeyer)
34: #
35: # 10/11,10/12 Gerd Kortemeyer)
36: #
37: # 10/16 Gerd Kortemeyer
38:
39: package Apache::lonsequence;
40:
41: use strict;
42: use Apache::lonnet;
43: use Apache::Constants qw(:common :http REDIRECT);
44: use GDBM_File;
45: use Apache::lonratedt;
46: use Apache::lonratsrv;
47:
48: # ----------------------------------------------------------- Could not resolve
49:
50: sub getlost {
51: my ($r,$errmsg)=@_;
52: $r->content_type('text/html');
53: $r->send_http_header;
54: $r->print(
55: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
56: 'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
57: '</body></html>');
58: }
59:
60:
61: # ----------------------------------------- Attempt to read from resource space
62:
63: sub attemptread {
64: my $fn=shift;
65: &Apache::lonnet::repcopy($fn);
66: if (-e $fn) {
67: return &Apache::lonratedt::attemptread($fn);
68: } else {
69: return ();
70: }
71: }
72:
73: # ---------------------------------------------------------------- View Handler
74:
75: sub viewmap {
76: my ($r,$url,$adv,$errtext)=@_;
77: $r->print('<html>');
78: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
79: <script>
80:
81: function select_group() {
82: window.location="/adm/groupsort?catalogmode=groupimport&mode=rat&acts="+document.forms.fileattr.acts.value;
83: }
84:
85: function queue(val) {
86: if (eval("document.forms."+val+".filelink.checked")) {
87: var l=val.length;
88: var v=val.substring(4,l);
89: document.forms.fileattr.acts.value+='1a'+v+'b';
90: }
91: else {
92: var l=val.length;
93: var v=val.substring(4,l);
94: document.forms.fileattr.acts.value+='0a'+v+'b';
95: }
96: }
97:
98:
99:
100: </script>
101: ENDSCRIPT
102: }
103: $r->print('<body bgcolor="#FFFFFF">'.&buttons($adv));
104: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
105: <form name=fileattr><input type=hidden name=acts value=''>
106: <input type="button" name="close" value='CLOSE' onClick="self.close()">
107: <input type="button" name="groupimport" value='GROUP IMPORT'
108: onClick="javascript:select_group()">
109: </form>
110: ENDSELECT
111: }
112: if ($errtext) {
113: $r->print($errtext.'<hr>');
114: }
115: my $idx=0;
116: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
117: if (defined($_)) {
118: $idx++;
119: if ($ENV{'form.forceselect'}) {
120: $r->print('<form name="form'.$idx.'">');
121: }
122: my ($title,$url)=split(/\:/,$_);
123: $title=~s/\&colon\;/\:/g;
124: $url=~s/\&colon\;/\:/g;
125: unless ($title) { $title=(split(/\//,$url))[-1] };
126: unless ($title) { $title='<i>Empty</i>'; }
127: if ($url) {
128: if ($ENV{'form.forceselect'}) {
129: $r->print(<<ENDCHECKBOX);
130: <input type='checkbox' name='filelink'
131: value='$url' onClick='javascript:queue("form$idx")' >
132: <input type='hidden' name='title' value='$title'>
133: ENDCHECKBOX
134: }
135: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
136: }
137: $r->print(&Apache::lonratsrv::qtescape($title));
138: if ($url) { $r->print('</a>'); }
139: if ($ENV{'form.forceselect'}) {
140: $r->print('</form>');
141: } else {
142: $r->print('<br>');
143: }
144: }
145: }
146: $r->print('</body></html>');
147: }
148:
149: # ================================================================ Main Handler
150:
151: sub handler {
152: my $r=shift;
153:
154: if ($r->header_only) {
155: $r->content_type('text/html');
156: $r->send_http_header;
157: return OK;
158: }
159:
160: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
161: ['forceselect']);
162:
163: my %hash;
164: my %bighash;
165: my $requrl=$r->uri;
166:
167: # ------------------------------------------------------------ Tie symb db file
168: if ($ENV{'request.course.fn'}) {
169: my $last;
170: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
171: &GDBM_READER,0640)) {
172: $last=$hash{'last_direction'};
173: untie(%hash);
174: }
175: my $direction='';
176: my $prevmap='';
177: if ($last) {
178: ($prevmap,$direction)=(split(/\_\_\_/,$last));
179: }
180: # ------------------------------------------------------------- Tie big db file
181: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
182: &GDBM_READER,0640)) {
183: my $disid='';
184: my $whatend='';
185: if ($direction eq 'back') {
186: $disid=$bighash{'map_finish_'.$requrl};
187: $whatend='End';
188: } else {
189: $disid=$bighash{'map_start_'.$requrl};
190: $whatend='Beginning';
191: }
192: my $disurl='';
193: my $dismapid='';
194: if ($disid) {
195: $disurl=$bighash{'src_'.$disid};
196: $dismapid=(split(/\./,$disid))[1];
197: }
198: my $symb='';
199: my $sequencetitle='';
200: unless($disurl) {
201: if ($symb=&Apache::lonnet::symbread()) {
202: my ($mapurl,$mapid)=split(/\_\_\_/,$symb);
203: $sequencetitle=$bighash{'title_'.
204: $bighash{'map_pc_/res/'.$mapurl}.'.'.
205: $mapid};
206: }
207: }
208: # --------------------------------------- Untie hash, make sure to come by here
209: untie(%bighash);
210: if ($disurl) {
211: # -------------------------------------------------- Has first or last resource
212: &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
213: 'last_known' => &Apache::lonnet::declutter($disurl));
214: $r->content_type('text/html');
215: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
216: return REDIRECT;
217: } else {
218: # ---------- Does not have first or last resource, try to find out where we are
219: unless ($symb) {
220: $r->internal_redirect('/adm/ambiguous');
221: }
222: $r->content_type('text/html');
223: $r->send_http_header;
224: $r->print(<<ENDSYMB);
225: <html><body bgcolor="#FFFFFF">
226: <h2>$whatend of</h2>
227: <h1>$sequencetitle</h1>
228: </body></html>
229: ENDSYMB
230: return OK
231: }
232: } else {
233: &getlost($r,'Could not access course structure.');
234: return OK;
235: }
236: } else {
237: $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
238: return HTTP_NOT_ACCEPTABLE;
239: }
240:
241: return OK;
242: }
243:
244: 1;
245: __END__
246:
247:
248:
249:
250:
251:
252:
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