1: # The LearningOnline Network with CAPA
2: #
3: # Sequence Handler
4: #
5: # $Id: lonsequence.pm,v 1.11 2002/05/23 15:07:55 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: use Apache::lonpageflip;
48:
49: # ----------------------------------------------------------- Could not resolve
50:
51: sub getlost {
52: my ($r,$errmsg)=@_;
53: $r->content_type('text/html');
54: $r->send_http_header;
55: $r->print(
56: '<head><title>Unknown Error</title></head><body bgcolor="#FFFFFF"><h1>'.
57: 'LON-CAPA</h1>Could not handle sequence resource reference.<p>'.$errmsg.
58: '</body></html>');
59: }
60:
61:
62: # ----------------------------------------- Attempt to read from resource space
63:
64: sub attemptread {
65: my $fn=shift;
66: &Apache::lonnet::repcopy($fn);
67: if (-e $fn) {
68: return &Apache::lonratedt::attemptread($fn);
69: } else {
70: return ();
71: }
72: }
73:
74: # ---------------------------------------------------------------- View Handler
75:
76: sub viewmap {
77: my ($r,$url)=@_;
78: $r->print('<html>');
79: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSCRIPT);
80: <script>
81:
82: function select_group() {
83: window.location="/adm/groupsort?catalogmode=groupimport&mode=rat&acts="+document.forms.fileattr.acts.value;
84: }
85:
86: function queue(val) {
87: if (eval("document.forms."+val+".filelink.checked")) {
88: var l=val.length;
89: var v=val.substring(4,l);
90: document.forms.fileattr.acts.value+='1a'+v+'b';
91: }
92: else {
93: var l=val.length;
94: var v=val.substring(4,l);
95: document.forms.fileattr.acts.value+='0a'+v+'b';
96: }
97: }
98:
99: </script>
100: ENDSCRIPT
101: }
102: $r->print('<body bgcolor="#FFFFFF">');
103: if ($ENV{'form.forceselect'}) { $r->print(<<ENDSELECT);
104: <form name=fileattr><input type=hidden name=acts value=''>
105: <input type="button" name="close" value='CLOSE' onClick="self.close()">
106: <input type="button" name="groupimport" value='GROUP IMPORT'
107: onClick="javascript:select_group()">
108: </form>
109: ENDSELECT
110: }
111: my $idx=0;
112: foreach (&attemptread(&Apache::lonnet::filelocation('',$url))) {
113: if (defined($_)) {
114: $idx++;
115: if ($ENV{'form.forceselect'}) {
116: $r->print('<form name="form'.$idx.'">');
117: }
118: my ($title,$url)=split(/\:/,$_);
119: $title=~s/\&colon\;/\:/g;
120: $url=~s/\&colon\;/\:/g;
121: unless ($title) { $title=(split(/\//,$url))[-1] };
122: unless ($title) { $title='<i>Empty</i>'; }
123: if ($url) {
124: if ($ENV{'form.forceselect'}) {
125: $r->print(<<ENDCHECKBOX);
126: <input type='checkbox' name='filelink'
127: value='$url' onClick='javascript:queue("form$idx")' >
128: <input type='hidden' name='title' value='$title'>
129: ENDCHECKBOX
130: }
131: $r->print('<a href="'.&Apache::lonratsrv::qtescape($url).'">');
132: }
133: $r->print(&Apache::lonratsrv::qtescape($title));
134: if ($url) { $r->print('</a>'); }
135: if ($ENV{'form.forceselect'}) {
136: $r->print('</form>');
137: } else {
138: $r->print('<br>');
139: }
140: }
141: }
142: $r->print('</body></html>');
143: }
144:
145: # ================================================================ Main Handler
146:
147: sub handler {
148: my $r=shift;
149:
150: if ($r->header_only) {
151: $r->content_type('text/html');
152: $r->send_http_header;
153: return OK;
154: }
155:
156: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
157: ['forceselect']);
158:
159: my %hash;
160: my %bighash;
161: my $requrl=$r->uri;
162:
163: # ------------------------------------------------------------ Tie symb db file
164: my $disurl='';
165: my $dismapid='';
166:
167: if (($ENV{'request.course.fn'}) && (!$ENV{'form.forceselect'})) {
168: my $last;
169: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
170: &GDBM_READER,0640)) {
171: $last=$hash{'last_direction'};
172: untie(%hash);
173: }
174: my $direction='';
175: my $prevmap='';
176: if ($last) {
177: ($prevmap,$direction)=(split(/\_\_\_/,$last));
178: }
179: # ------------------------------------------------------------- Tie big db file
180: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
181: &GDBM_READER,0640)) {
182: my $disid='';
183:
184: if ($direction eq 'back') {
185: $disid=$bighash{'map_finish_'.$requrl};
186: } else {
187: $disid=$bighash{'map_start_'.$requrl};
188: }
189: if ($disid) {
190: $disurl=$bighash{'src_'.$disid};
191: $dismapid=(split(/\./,$disid))[1];
192: }
193: # ------------------------- If this is an empty one, skip to next non-empty one
194: if ((!$disurl) && ($disid)) {
195: $direction=($direction?$direction:'forward');
196: ($disid,$requrl)=
197: &Apache::lonpageflip::fullmove($disid,
198: &Apache::lonnet::declutter($requrl),$direction);
199: if ($disid) {
200: $disurl=$bighash{'src_'.$disid};
201: $dismapid=(split(/\./,$disid))[1];
202: }
203: }
204:
205: # --------------------------------------- Untie hash, make sure to come by here
206: untie(%bighash);
207: }
208: }
209:
210: # now either disurl is set (going to first page), or we need another display
211:
212: if ($disurl) {
213: # -------------------------------------------------- Has first or last resource
214: &Apache::lonnet::symblist($requrl,$disurl => $dismapid,
215: 'last_known' => &Apache::lonnet::declutter($disurl));
216: $r->content_type('text/html');
217: $r->header_out(Location => 'http://'.$ENV{'HTTP_HOST'}.$disurl);
218: return REDIRECT;
219: } else {
220: $r->content_type('text/html');
221: $r->send_http_header;
222: &viewmap($r,$requrl);
223: return OK;
224: }
225: }
226:
227: 1;
228: __END__
229:
230:
231:
232:
233:
234:
235:
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