Annotation of rat/lonpageflip.pm, revision 1.49
1.1 www 1: # The LearningOnline Network with CAPA
2: #
3: # Page flip handler
4: #
1.49 ! albertel 5: # $Id: lonpageflip.pm,v 1.48 2004/10/18 22:24:00 albertel Exp $
1.18 www 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: #
1.1 www 29: # (Page Handler
30: #
31: # (TeX Content Handler
32: #
33: # 05/29/00,05/30 Gerd Kortemeyer)
34: # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23,
35: # 10/02 Gerd Kortemeyer)
36: #
1.13 www 37: # 10/03,10/05,10/06,10/07,10/09,10/10,10/11,10/16,10/17,
1.14 www 38: # 11/14,11/16,
1.17 www 39: # 10/01/01,05/01,05/28,07/05 Gerd Kortemeyer
1.1 www 40:
41: package Apache::lonpageflip;
42:
43: use strict;
1.4 www 44: use Apache::Constants qw(:common :http REDIRECT);
1.1 www 45: use Apache::lonnet();
46: use HTML::TokeParser;
47: use GDBM_File;
48:
1.3 www 49: # ========================================================== Module Global Hash
50:
1.1 www 51: my %hash;
1.34 www 52:
53: sub cleanup {
54: if (tied(%hash)){
55: &Apache::lonnet::logthis('Cleanup pageflip: hash');
56: unless (untie(%hash)) {
57: &Apache::lonnet::logthis('Failed cleanup pageflip: hash');
58: }
59: }
60: }
1.1 www 61:
1.3 www 62: sub addrid {
1.4 www 63: my ($current,$new,$condid)=@_;
64: unless ($condid) { $condid=0; }
1.27 www 65:
1.3 www 66: if ($current) {
1.5 www 67: $current.=','.$new;
1.3 www 68: } else {
1.5 www 69: $current=''.$new;
1.3 www 70: }
1.27 www 71:
1.3 www 72: return $current;
1.25 www 73: }
74:
75: sub fullmove {
76: my ($rid,$mapurl,$direction)=@_;
77: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.28 albertel 78: &GDBM_READER(),0640)) {
1.25 www 79: ($rid,$mapurl)=&move($rid,$mapurl,$direction);
80: untie(%hash);
81: }
82: return($rid,$mapurl);
1.1 www 83: }
84:
1.15 www 85: sub move {
86: my ($rid,$mapurl,$direction)=@_;
1.23 www 87: my $startoutrid=$rid;
1.15 www 88:
89: my $next='';
90:
91: my $mincond=1;
92: my $posnext='';
93: if ($direction eq 'forward') {
94: # --------------------------------------------------------------------- Forward
1.33 www 95: while ($hash{'type_'.$rid} eq 'finish') {
96: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
1.15 www 97: }
98: map {
99: my $thiscond=
100: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
101: if ($thiscond>=$mincond) {
102: if ($posnext) {
103: $posnext.=','.$_.':'.$thiscond;
104: } else {
105: $posnext=$_.':'.$thiscond;
106: }
107: if ($thiscond>$mincond) { $mincond=$thiscond; }
108: }
109: } split(/\,/,$hash{'to_'.$rid});
110: map {
111: my ($linkid,$condval)=split(/\:/,$_);
112: if ($condval>=$mincond) {
113: $next=&addrid($next,$hash{'goesto_'.$linkid},
114: $hash{'condid_'.$hash{'undercond_'.$linkid}});
115: }
116: } split(/\,/,$posnext);
117: if ($hash{'is_map_'.$next}) {
1.23 www 118: # This jumps to the beginning of a new map (going down level)
1.15 www 119: if (
120: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
121: $mapurl=$hash{'src_'.$next};
122: $next=$hash{'map_start_'.$hash{'src_'.$next}};
1.47 raeburn 123: } elsif (
124: # This jumps back up from an empty sequence, to a page up one level
125: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
126: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 127: }
1.23 www 128: } elsif
129: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
130: # This comes up from a map (coming up one level);
131: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 132: }
133: } elsif ($direction eq 'back') {
134: # ------------------------------------------------------------------- Backwards
1.33 www 135: while ($hash{'type_'.$rid} eq 'start') {
136: $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}};
137: }
1.15 www 138: map {
139: my $thiscond=
140: &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}});
141: if ($thiscond>=$mincond) {
142: if ($posnext) {
143: $posnext.=','.$_.':'.$thiscond;
144: } else {
145: $posnext=$_.':'.$thiscond;
146: }
147: if ($thiscond>$mincond) { $mincond=$thiscond; }
148: }
149: } split(/\,/,$hash{'from_'.$rid});
150: map {
151: my ($linkid,$condval)=split(/\:/,$_);
152: if ($condval>=$mincond) {
153: $next=&addrid($next,$hash{'comesfrom_'.$linkid},
154: $hash{'condid_'.$hash{'undercond_'.$linkid}});
155: }
156: } split(/\,/,$posnext);
157: if ($hash{'is_map_'.$next}) {
1.24 www 158: # This jumps to the end of a new map (going down one level)
1.15 www 159: if (
160: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'sequence') {
161: $mapurl=$hash{'src_'.$next};
162: $next=$hash{'map_finish_'.$hash{'src_'.$next}};
1.47 raeburn 163: } elsif (
164: $hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$next}}} eq 'page') {
165: # This jumps back up from an empty sequence, to a page up one level
166: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
167: }
1.24 www 168: } elsif
169: ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) {
170: # This comes back up from a map (going up one level);
171: $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]};
1.15 www 172: }
173: }
174: return ($next,$mapurl);
175: }
176:
1.1 www 177: # ================================================================ Main Handler
178:
179: sub handler {
1.2 www 180: my $r=shift;
1.1 www 181:
182: # ------------------------------------------- Set document type for header only
183:
1.2 www 184: if ($r->header_only) {
1.1 www 185: $r->content_type('text/html');
186: $r->send_http_header;
1.2 www 187: return OK;
188: }
189:
1.5 www 190: my %cachehash=();
191: my $multichoice=0;
192: my %multichoicehash=();
1.4 www 193: my $redirecturl='';
194: my $next='';
195: my @possibilities=();
1.37 www 196: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']);
1.2 www 197: if (($ENV{'form.postdata'})&&($ENV{'request.course.fn'})) {
198: $ENV{'form.postdata'}=~/(\w+)\:(.*)/;
199: my $direction=$1;
1.40 www 200: my $currenturl=$2;
1.46 www 201: $currenturl=~s/\.\d+\.(\w+)$/\.$1/;
1.10 www 202: if ($direction eq 'return') {
203: # -------------------------------------------------------- Return to last known
204: my $last;
205: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1.28 albertel 206: &GDBM_READER(),0640)) {
1.10 www 207: $last=$hash{'last_known'};
208: untie(%hash);
209: }
210: my $newloc;
1.36 www 211: if (($last) && (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
212: &GDBM_READER(),0640))) {
1.41 www 213: my ($murl,$fn)=&Apache::lonnet::decode_symb($last);
1.37 www 214: my $id;
1.41 www 215: ($murl,$id,$fn)=&Apache::lonnet::decode_symb(&Apache::lonnet::symbread($fn));
1.37 www 216: $newloc=$hash{'src_'.
217: $hash{'map_pc_'.&Apache::lonnet::clutter($murl)}.'.'.$id};
218: unless ($newloc) { $newloc='/adm/noidea.html'; }
1.36 www 219: untie %hash;
1.10 www 220: } else {
221: $newloc='/adm/noidea.html';
222: }
223: $r->content_type('text/html');
224: $r->header_out(Location =>
225: 'http://'.$ENV{'HTTP_HOST'}.$newloc);
226:
227: return REDIRECT;
228: }
1.2 www 229: $currenturl=~s/^http\:\/\///;
230: $currenturl=~s/^[^\/]+//;
1.35 www 231: #
232: # Is the current URL on the map? If not, start with last known URL
233: #
234: unless (&Apache::lonnet::is_on_map($currenturl)) {
1.7 www 235: my $last;
236: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1.28 albertel 237: &GDBM_READER(),0640)) {
1.7 www 238: $last=$hash{'last_known'};
239: untie(%hash);
240: }
241: if ($last) {
1.41 www 242: $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[1]);
1.7 www 243: } else {
244: $r->content_type('text/html');
245: $r->header_out(Location =>
246: 'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html');
1.9 www 247: return REDIRECT;
1.7 www 248: }
249: }
1.3 www 250: # ------------------------------------------- Do we have any idea where we are?
251: my $position;
252: if ($position=Apache::lonnet::symbread($currenturl)) {
253: # ------------------------------------------------------------------------- Yes
1.41 www 254: my ($startoutmap,$mapnum,$thisurl)=&Apache::lonnet::decode_symb($position);
1.22 www 255: $cachehash{$startoutmap}{$thisurl}=$mapnum;
1.23 www 256: $cachehash{$startoutmap}{'last_known'}=
257: &Apache::lonnet::declutter($currenturl);
1.20 albertel 258:
1.5 www 259: # ============================================================ Tie the big hash
1.3 www 260: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1.28 albertel 261: &GDBM_READER(),0640)) {
1.29 www 262: my $rid=$hash{'map_pc_'.&Apache::lonnet::clutter($startoutmap)}.
263: '.'.$mapnum;
1.14 www 264:
1.15 www 265: # ------------------------------------------------- Move forward, backward, etc
1.22 www 266: my $endupmap;
267: ($next,$endupmap)=&move($rid,$startoutmap,$direction);
1.15 www 268: # -------------------------------------- Do we have one and only one empty URL?
269: my $safecount=0;
1.26 www 270: while (($next) && ($next!~/\,/) &&
1.48 albertel 271: ((!$hash{'src_'.$next}) ||
1.49 ! albertel 272: ((!$ENV{'request.role.adv'}) && $hash{'randomout_'.$next}))
1.26 www 273: && ($safecount<10000)) {
1.22 www 274: ($next,$endupmap)=&move($next,$endupmap,$direction);
1.15 www 275: $safecount++;
276: }
1.22 www 277: # We are now at at least one non-empty URL
1.4 www 278: # ----------------------------------------------------- Check out possibilities
279: if ($next) {
280: @possibilities=split(/\,/,$next);
281: if ($#possibilities==0) {
1.5 www 282: # ---------------------------------------------- Only one possibility, redirect
283: $redirecturl=$hash{'src_'.$next};
1.22 www 284: $cachehash{$endupmap}
1.19 www 285: {&Apache::lonnet::declutter($redirecturl)}
1.5 www 286: =(split(/\./,$next))[1];
1.4 www 287: } else {
1.5 www 288: # ------------------------ There are multiple possibilities for a next resource
289: $multichoice=1;
290: map {
291: $multichoicehash{'src_'.$_}=$hash{'src_'.$_};
292: $multichoicehash{'title_'.$_}=$hash{'title_'.$_};
1.6 www 293: $multichoicehash{'type_'.$_}=$hash{'type_'.$_};
1.32 bowersj2 294: (my $first, my $second) = $_ =~ /(\d+).(\d+)/;
295: my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$_});
296: $multichoicehash{'symb_'.$_} =
297: Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'.
298: $second.'___'.$symbSrc);
299:
1.22 www 300: my ($choicemap,$choiceres)=split(/\./,$_);
301: $cachehash
302: {&Apache::lonnet::declutter($hash{'src_'.$choicemap})}
303: {&Apache::lonnet::declutter(
1.5 www 304: $multichoicehash
305: {'src_'.$_}
306: )}
1.22 www 307: =$choiceres;
1.5 www 308: } @possibilities;
1.4 www 309: }
1.5 www 310: } else {
311: # -------------------------------------------------------------- No place to go
312: $multichoice=-1;
1.4 www 313: }
1.5 www 314: # ----------------- The program must come past this point to untie the big hash
1.3 www 315: untie(%hash);
1.5 www 316: # --------------------------------------------------------- Store position info
1.22 www 317: $cachehash{$startoutmap}{'last_direction'}=$direction;
1.19 www 318: foreach my $thismap (keys %cachehash) {
1.20 albertel 319: &Apache::lonnet::symblist($thismap,%{$cachehash{$thismap}});
1.19 www 320: }
1.5 www 321: # ============================================== Do not return before this line
1.4 www 322: if ($redirecturl) {
1.5 www 323: # ----------------------------------------------------- There is a URL to go to
1.38 www 324: if ($direction eq 'forward') {
325: &Apache::lonnet::linklog($currenturl,$redirecturl);
326: }
327: if ($direction eq 'back') {
328: &Apache::lonnet::linklog($redirecturl,$currenturl);
329: }
1.31 www 330: # ------------------------------------------------- Check for critical messages
331: if ((time-$ENV{'user.criticalcheck.time'})>300) {
332: my @what=&Apache::lonnet::dump
333: ('critical',$ENV{'user.domain'},
334: $ENV{'user.name'});
335: if ($what[0]) {
336: if (($what[0] ne 'con_lost') &&
337: ($what[0]!~/^error\:/)) {
338: $redirecturl='/adm/email?critical=display';
339: }
340: }
341: &Apache::lonnet::appenv('user.criticalcheck.time'=>time);
342: }
343:
1.4 www 344: $r->content_type('text/html');
345: $r->header_out(Location =>
346: 'http://'.$ENV{'HTTP_HOST'}.$redirecturl);
347: return REDIRECT;
1.5 www 348: } else {
349: # --------------------------------------------------------- There was a problem
1.8 www 350: $r->content_type('text/html');
351: $r->send_http_header;
352: if ($#possibilities>0) {
1.37 www 353: my $bodytag=
354: &Apache::loncommon::bodytag('Multiple Resources');
1.8 www 355: $r->print(<<ENDSTART);
356: <head><title>Choose Next Location</title></head>
1.37 www 357: $bodytag
358: <h3>There are several possibilities of where to go next</h3>
1.8 www 359: <p>
360: Please click on the the resource you intend to access:
361: <p>
362: <table border=2>
363: <tr><th>Title</th><th>Type</th></tr>
364: ENDSTART
1.26 www 365: foreach (@possibilities) {
1.8 www 366: $r->print(
367: '<tr><td><a href="'.
1.32 bowersj2 368: $multichoicehash{'src_'.$_}.'?symb=' .
369: Apache::lonnet::escape($multichoicehash{'symb_'.$_}).'">'.
1.8 www 370: $multichoicehash{'title_'.$_}.
371: '</a></td><td>'.$multichoicehash{'type_'.$_}.
372: '</td></tr>');
1.26 www 373: }
1.8 www 374: $r->print('</table></body></html>');
375: return OK;
376: } else {
1.37 www 377: my $bodytag=&Apache::loncommon::bodytag('No Resource');
1.8 www 378: $r->print(<<ENDNONE);
1.37 www 379: <head><title>No Resource</title></head>
380: $bodytag
381: <h3>Next resource could not be identified.</h3>
382: <p>You probably are at the <b>beginning</b> or the <b>end</b> of the
383: course.</p>
384: <ul>
385: <li><a href="/adm/flip?postdata=return:">Go Back</a></li>
386: <li><a href="/adm/navmaps">Navigate Course Content</a></li>
387: </ul>
1.8 www 388: </body>
389: </html>
390: ENDNONE
391: return OK;
392: }
393: }
1.5 www 394: } else {
395: # ------------------------------------------------- Problem, could not tie hash
396: $ENV{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing";
397: return HTTP_NOT_ACCEPTABLE;
1.3 www 398: }
1.5 www 399: } else {
400: # ---------------------------------------- No, could not determine where we are
1.45 albertel 401: if ( &Apache::lonnet::mod_perl_version() == 2 ) {
1.42 albertel 402: &Apache::lonnet::cleanenv();
403: }
404: $r->internal_redirect('/adm/ambiguous');
1.2 www 405: }
1.5 www 406: } else {
1.2 www 407: # -------------------------- Class was not initialized or page fliped strangely
408: $ENV{'user.error.msg'}="/adm/flip:bre:0:0:Choose Course";
409: return HTTP_NOT_ACCEPTABLE;
410: }
1.1 www 411: }
412:
413: 1;
414: __END__
415:
416:
417:
418:
419:
420:
421:
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