Annotation of rat/lonuserstate.pm, revision 1.121
1.1 www 1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
1.120 albertel 4: # $Id: lonuserstate.pm,v 1.119 2007/06/28 22:16:53 albertel Exp $
1.25 www 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: #
1.26 harris41 28: ###
1.1 www 29:
30: package Apache::lonuserstate;
31:
1.26 harris41 32: # ------------------------------------------------- modules used by this module
1.1 www 33: use strict;
34: use HTML::TokeParser;
1.89 albertel 35: use Apache::lonnet;
1.114 www 36: use Apache::lonlocal;
1.26 harris41 37: use Apache::loncommon();
1.1 www 38: use GDBM_File;
1.12 www 39: use Apache::lonmsg;
1.15 www 40: use Safe;
1.21 www 41: use Safe::Hole;
1.15 www 42: use Opcode;
1.73 www 43: use Apache::lonenc;
1.96 albertel 44: use Fcntl qw(:flock);
1.114 www 45: use LONCAPA;
46:
1.15 www 47:
1.1 www 48: # ---------------------------------------------------- Globals for this package
49:
50: my $pc; # Package counter
51: my %hash; # The big tied hash
1.19 www 52: my %parmhash;# The hash with the parameters
1.1 www 53: my @cond; # Array with all of the conditions
54: my $errtext; # variable with all errors
1.116 www 55: my $retfrid; # variable with the very first RID in the course
56: my $retfurl; # first URL
1.29 www 57: my %randompick; # randomly picked resources
1.51 www 58: my %randompickseed; # optional seed for randomly picking resources
1.73 www 59: my %encurl; # URLs in this folder are supposed to be encrypted
60: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
1.61 www 61:
62: # ----------------------------------- Remove version from URL and store in hash
63:
64: sub versiontrack {
65: my $uri=shift;
66: if ($uri=~/\.(\d+)\.\w+$/) {
67: my $version=$1;
68: $uri=~s/\.\d+\.(\w+)$/\.$1/;
1.62 www 69: unless ($hash{'version_'.$uri}) {
70: $hash{'version_'.$uri}=$version;
71: }
1.61 www 72: }
73: return $uri;
74: }
75:
76: # -------------------------------------------------------------- Put in version
77:
78: sub putinversion {
79: my $uri=shift;
1.93 www 80: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
1.61 www 81: if ($hash{'version_'.$uri}) {
82: my $version=$hash{'version_'.$uri};
1.65 www 83: if ($version eq 'mostrecent') { return $uri; }
1.66 www 84: if ($version eq &Apache::lonnet::getversion(
85: &Apache::lonnet::filelocation('',$uri)))
86: { return $uri; }
1.61 www 87: $uri=~s/\.(\w+)$/\.$version\.$1/;
88: }
1.93 www 89: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
1.61 www 90: return $uri;
91: }
92:
93: # ----------------------------------------- Processing versions file for course
94:
95: sub processversionfile {
1.64 www 96: my %cenv=@_;
1.61 www 97: my %versions=&Apache::lonnet::dump('resourceversions',
98: $cenv{'domain'},
99: $cenv{'num'});
1.106 albertel 100: foreach my $ver (keys(%versions)) {
101: if ($ver=~/^error\:/) { return; }
102: $hash{'version_'.$ver}=$versions{$ver};
1.61 www 103: }
104: }
1.45 www 105:
1.1 www 106: # --------------------------------------------------------- Loads map from disk
107:
108: sub loadmap {
109: my $uri=shift;
1.114 www 110: if ($hash{'map_pc_'.$uri}) {
1.120 albertel 111: $errtext.='<p class="LC_error">'.
112: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
113: '</p>';
1.114 www 114: return;
115: }
1.1 www 116: $pc++;
117: my $lpc=$pc;
118: $hash{'map_pc_'.$uri}=$lpc;
119: $hash{'map_id_'.$lpc}=$uri;
120:
1.37 www 121: # Determine and check filename
1.62 www 122: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
1.37 www 123:
124: my $ispage=($fn=~/\.page$/);
1.1 www 125:
1.10 www 126: unless (($fn=~/\.sequence$/) ||
1.1 www 127: ($fn=~/\.page$/)) {
1.114 www 128: $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
1.98 albertel 129: return;
1.1 www 130: }
131:
1.37 www 132: my $instr=&Apache::lonnet::getfile($fn);
133:
1.57 albertel 134: unless ($instr eq -1) {
1.22 www 135:
1.37 www 136: # Successfully got file, parse it
1.1 www 137:
138: my $parser = HTML::TokeParser->new(\$instr);
1.95 www 139: $parser->attr_encoded(1);
1.1 www 140: my $token;
141:
142: my $linkpc=0;
143:
144: $fn=~/\.(\w+)$/;
145:
146: $hash{'map_type_'.$lpc}=$1;
147:
148: while ($token = $parser->get_token) {
149: if ($token->[0] eq 'S') {
150: if ($token->[1] eq 'resource') {
151: # -------------------------------------------------------------------- Resource
1.92 www 152: if ($token->[2]->{'type'} eq 'zombie') { next; }
1.1 www 153: my $rid=$lpc.'.'.$token->[2]->{'id'};
154:
155: $hash{'kind_'.$rid}='res';
156: $hash{'title_'.$rid}=$token->[2]->{'title'};
1.61 www 157: my $turi=&versiontrack($token->[2]->{'src'});
158: if ($token->[2]->{'version'}) {
1.62 www 159: unless ($hash{'version_'.$turi}) {
160: $hash{'version_'.$turi}=$1;
161: }
1.61 www 162: }
1.83 albertel 163: my $title=$token->[2]->{'title'};
164: $title=~s/\&colon\;/\:/gs;
1.84 albertel 165: # my $symb=&Apache::lonnet::encode_symb($uri,
166: # $token->[2]->{'id'},
167: # $turi);
168: # &Apache::lonnet::do_cache_new('title',$symb,$title);
1.22 www 169: unless ($ispage) {
170: $turi=~/\.(\w+)$/;
1.26 harris41 171: my $embstyle=&Apache::loncommon::fileembstyle($1);
1.40 www 172: if ($token->[2]->{'external'} eq 'true') { # external
1.22 www 173: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//;
1.40 www 174: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
1.97 www 175: if (($embstyle eq 'img')
176: || ($embstyle eq 'emb')
1.99 albertel 177: || ($embstyle eq 'wrp')) {
1.76 albertel 178: $turi='/adm/wrapper'.$turi;
1.78 albertel 179: } elsif ($embstyle eq 'ssi') {
180: #do nothing with these
181: } elsif ($turi!~/\.(sequence|page)$/) {
1.42 www 182: $turi='/adm/coursedocs/showdoc'.$turi;
1.40 www 183: }
1.70 www 184: } elsif ($turi=~/\S/) { # normal non-empty internal resource
1.68 www 185: my $mapdir=$uri;
186: $mapdir=~s/[^\/]+$//;
187: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
1.99 albertel 188: if (($embstyle eq 'img')
189: || ($embstyle eq 'emb')
190: || ($embstyle eq 'wrp')) {
1.68 www 191: $turi='/adm/wrapper'.$turi;
192: }
1.22 www 193: }
194: }
1.71 www 195: # Store reverse lookup, remove query string
196: my $idsuri=$turi;
197: $idsuri=~s/\?.+$//;
198: if (defined($hash{'ids_'.$idsuri})) {
199: $hash{'ids_'.$idsuri}.=','.$rid;
1.1 www 200: } else {
1.71 www 201: $hash{'ids_'.$idsuri}=''.$rid;
1.1 www 202: }
1.53 www 203:
1.118 raeburn 204: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) {
1.53 www 205: $turi.='?register=1';
206: }
207:
208: $hash{'src_'.$rid}=$turi;
1.1 www 209:
1.22 www 210: if ($token->[2]->{'external'} eq 'true') {
1.1 www 211: $hash{'ext_'.$rid}='true:';
212: } else {
213: $hash{'ext_'.$rid}='false:';
214: }
215: if ($token->[2]->{'type'}) {
216: $hash{'type_'.$rid}=$token->[2]->{'type'};
1.2 www 217: if ($token->[2]->{'type'} eq 'start') {
218: $hash{'map_start_'.$uri}="$rid";
219: }
220: if ($token->[2]->{'type'} eq 'finish') {
221: $hash{'map_finish_'.$uri}="$rid";
222: }
1.1 www 223: } else {
224: $hash{'type_'.$rid}='normal';
225: }
226:
1.10 www 227: if (($turi=~/\.sequence$/) ||
1.1 www 228: ($turi=~/\.page$/)) {
1.2 www 229: $hash{'is_map_'.$rid}=1;
1.1 www 230: &loadmap($turi);
231: }
232:
233: } elsif ($token->[1] eq 'condition') {
234: # ------------------------------------------------------------------- Condition
235:
236: my $rid=$lpc.'.'.$token->[2]->{'id'};
237:
238: $hash{'kind_'.$rid}='cond';
1.2 www 239: $cond[$#cond+1]=$token->[2]->{'value'};
240: $hash{'condid_'.$rid}=$#cond;
1.1 www 241: if ($token->[2]->{'type'}) {
1.2 www 242: $cond[$#cond].=':'.$token->[2]->{'type'};
1.1 www 243: } else {
1.2 www 244: $cond[$#cond].=':normal';
1.1 www 245: }
246:
247: } elsif ($token->[1] eq 'link') {
248: # ----------------------------------------------------------------------- Links
249:
250: $linkpc++;
251: my $linkid=$lpc.'.'.$linkpc;
252:
253: my $goesto=$lpc.'.'.$token->[2]->{'to'};
254: my $comesfrom=$lpc.'.'.$token->[2]->{'from'};
255: my $undercond=0;
256:
257: if ($token->[2]->{'condition'}) {
258: $undercond=$lpc.'.'.$token->[2]->{'condition'};
259: }
260:
261: $hash{'goesto_'.$linkid}=$goesto;
262: $hash{'comesfrom_'.$linkid}=$comesfrom;
263: $hash{'undercond_'.$linkid}=$undercond;
264:
265: if (defined($hash{'to_'.$comesfrom})) {
266: $hash{'to_'.$comesfrom}.=','.$linkid;
267: } else {
268: $hash{'to_'.$comesfrom}=''.$linkid;
269: }
270: if (defined($hash{'from_'.$goesto})) {
271: $hash{'from_'.$goesto}.=','.$linkid;
272: } else {
273: $hash{'from_'.$goesto}=''.$linkid;
274: }
1.18 www 275: } elsif ($token->[1] eq 'param') {
276: # ------------------------------------------------------------------- Parameter
277:
278: my $referid=$lpc.'.'.$token->[2]->{'to'};
1.63 albertel 279: my $name=$token->[2]->{'name'};
280: my $part;
281: if ($name=~/^parameter_(.*)_/) {
282: $part=$1;
283: } else {
284: $part=0;
285: }
286: $name=~s/^.*_([^_]*)$/$1/;
1.18 www 287: my $newparam=
1.114 www 288: &escape($token->[2]->{'type'}).':'.
289: &escape($part.'.'.$name).'='.
290: &escape($token->[2]->{'value'});
1.18 www 291: if (defined($hash{'param_'.$referid})) {
292: $hash{'param_'.$referid}.='&'.$newparam;
293: } else {
294: $hash{'param_'.$referid}=''.$newparam;
295: }
1.75 www 296: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) {
1.29 www 297: $randompick{$referid}=$token->[2]->{'value'};
298: }
1.75 www 299: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) {
1.119 albertel 300: $randompickseed{$referid}=$token->[2]->{'value'};
1.51 www 301: }
1.75 www 302: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
1.74 www 303: if ($token->[2]->{'value'}=~/^yes$/i) {
304: $encurl{$referid}=1;
305: }
1.73 www 306: }
1.75 www 307: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
1.74 www 308: if ($token->[2]->{'value'}=~/^yes$/i) {
309: $hiddenurl{$referid}=1;
310: }
1.73 www 311: }
1.1 www 312: }
1.85 albertel 313:
1.1 www 314: }
315: }
316:
317: } else {
1.114 www 318: $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
1.1 www 319: }
1.121 ! albertel 320:
! 321: my $parser = HTML::TokeParser->new(\$instr);
! 322: $parser->attr_encoded(1);
! 323: # last parse out the mapalias params so as to ignore anything
! 324: # refering to non-existant resources
! 325: while (my $token = $parser->get_token) {
! 326: next if ($token->[0] ne 'S');
! 327: if ($token->[1] eq 'param') {
! 328: &parse_mapalias_param($token,$lpc);
! 329: }
! 330: }
! 331: }
! 332:
! 333: sub parse_mapalias_param {
! 334: my ($token,$lpc) = @_;
! 335: my $referid=$lpc.'.'.$token->[2]->{'to'};
! 336: return if (!exists($hash{'src_'.$referid}));
! 337:
! 338: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
! 339: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
! 340: }
1.1 www 341: }
342:
1.3 www 343: # --------------------------------------------------------- Simplify expression
344:
345: sub simplify {
1.85 albertel 346: my $expression=shift;
1.101 albertel 347: # (0&1) = 1
1.105 albertel 348: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1.3 www 349: # (8)=8
1.105 albertel 350: $expression=~s/\(([_\.\d]+)\)/$1/g;
1.3 www 351: # 8&8=8
1.105 albertel 352: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1.3 www 353: # 8|8=8
1.105 albertel 354: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
1.3 www 355: # (5&3)&4=5&3&4
1.105 albertel 356: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1.3 www 357: # (((5&3)|(4&6)))=((5&3)|(4&6))
1.105 albertel 358: $expression=~
359: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1.3 www 360: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1.85 albertel 361: $expression=~
1.105 albertel 362: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1.85 albertel 363: return $expression;
1.3 www 364: }
365:
1.2 www 366: # -------------------------------------------------------- Build condition hash
367:
368: sub traceroute {
1.77 www 369: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1.81 albertel 370: my $newsofar=$sofar=simplify($sofar);
1.120 albertel 371: unless ($beenhere=~/\&\Q$rid\E\&/) {
1.85 albertel 372: $beenhere.=$rid.'&';
373: my ($mapid,$resid)=split(/\./,$rid);
374: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
375: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1.91 albertel 376:
1.90 albertel 377: if ($hdnflag || lc($hidden) eq 'yes') {
378: $hiddenurl{$rid}=1;
1.91 albertel 379: }
380: if (!$hdnflag && lc($hidden) eq 'no') {
1.90 albertel 381: delete($hiddenurl{$rid});
382: }
1.91 albertel 383:
1.85 albertel 384: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
385: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1.116 www 386: if (($retfrid eq '') && ($hash{'src_'.$rid})
1.85 albertel 387: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1.116 www 388: $retfrid=$rid;
1.85 albertel 389: }
390: if (defined($hash{'conditions_'.$rid})) {
391: $hash{'conditions_'.$rid}=simplify(
1.103 albertel 392: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.85 albertel 393: } else {
394: $hash{'conditions_'.$rid}=$sofar;
395: }
1.107 albertel 396:
397: # if the expression is just the 0th condition keep it
398: # otherwise leave a pointer to this condition expression
399: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
400:
1.85 albertel 401: if (defined($hash{'is_map_'.$rid})) {
402: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
403: $sofar=$newsofar=
404: &traceroute($sofar,
405: $hash{'map_start_'.$hash{'src_'.$rid}},'&',
406: $encflag || $encurl{$rid},
407: $hdnflag || $hiddenurl{$rid});
408: }
409: }
410: if (defined($hash{'to_'.$rid})) {
1.106 albertel 411: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.2 www 412: my $further=$sofar;
1.106 albertel 413: if ($hash{'undercond_'.$id}) {
414: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1.105 albertel 415: $further=simplify('('.'_'.$rid.')&('.
1.106 albertel 416: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1.85 albertel 417: } else {
1.114 www 418: $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
1.85 albertel 419: }
1.2 www 420: }
1.106 albertel 421: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1.81 albertel 422: $encflag,$hdnflag);
1.85 albertel 423: }
424: }
1.2 www 425: }
1.81 albertel 426: return $newsofar;
1.2 www 427: }
1.1 www 428:
1.19 www 429: # ------------------------------ Cascading conditions, quick access, parameters
1.4 www 430:
431: sub accinit {
432: my ($uri,$short,$fn)=@_;
433: my %acchash=();
434: my %captured=();
435: my $condcounter=0;
1.5 www 436: $acchash{'acc.cond.'.$short.'.0'}=0;
1.104 albertel 437: foreach my $key (keys(%hash)) {
438: if ($key=~/^conditions/) {
439: my $expr=$hash{$key};
1.109 albertel 440: # try to find and factor out common sub-expressions
1.105 albertel 441: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1.104 albertel 442: my $orig=$sub;
1.109 albertel 443:
444: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
445: next if (!defined($factor));
446:
447: $sub=~s/\Q$factor\E//g;
1.85 albertel 448: $sub=~s/^\(/\($factor\(/;
449: $sub.=')';
450: $sub=simplify($sub);
1.109 albertel 451: $expr=~s/\Q$orig\E/$sub/;
1.85 albertel 452: }
1.104 albertel 453: $hash{$key}=$expr;
1.85 albertel 454: unless (defined($captured{$expr})) {
455: $condcounter++;
456: $captured{$expr}=$condcounter;
457: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
458: }
1.104 albertel 459: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
1.86 albertel 460: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
461: $hash{'src_'.$1.'.'.$2});
1.104 albertel 462: foreach my $param (split(/\&/,$hash{$key})) {
463: my ($typename,$value)=split(/\=/,$param);
1.85 albertel 464: my ($type,$name)=split(/\:/,$typename);
1.114 www 465: $parmhash{$prefix.'.'.&unescape($name)}=
466: &unescape($value);
467: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
468: &unescape($type);
1.85 albertel 469: }
470: }
1.26 harris41 471: }
1.104 albertel 472: foreach my $key (keys(%hash)) {
473: if ($key=~/^ids/) {
474: foreach my $resid (split(/\,/,$hash{$key})) {
1.85 albertel 475: my $uri=$hash{'src_'.$resid};
1.100 albertel 476: my ($uripath,$urifile) =
477: &Apache::lonnet::split_uri_for_cond($uri);
1.85 albertel 478: if ($uripath) {
479: my $uricond='0';
480: if (defined($hash{'conditions_'.$resid})) {
481: $uricond=$captured{$hash{'conditions_'.$resid}};
482: }
483: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
484: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
485: /(\&\Q$urifile\E\:[^\&]*)/) {
486: my $replace=$1;
487: my $regexp=$replace;
488: #$regexp=~s/\|/\\\|/g;
1.105 albertel 489: $acchash{'acc.res.'.$short.'.'.$uripath} =~
1.104 albertel 490: s/\Q$regexp\E/$replace\|$uricond/;
1.85 albertel 491: } else {
492: $acchash{'acc.res.'.$short.'.'.$uripath}.=
493: $urifile.':'.$uricond.'&';
494: }
495: } else {
496: $acchash{'acc.res.'.$short.'.'.$uripath}=
497: '&'.$urifile.':'.$uricond.'&';
498: }
499: }
500: }
501: }
1.26 harris41 502: }
1.24 www 503: $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8 www 504: my $courseuri=$uri;
505: $courseuri=~s/^\/res\///;
1.19 www 506: &Apache::lonnet::delenv('(acc\.|httpref\.)');
1.79 albertel 507: &Apache::lonnet::appenv(%acchash);
1.4 www 508: }
509:
1.73 www 510: # ---------------- Selectively delete from randompick maps and hidden url parms
1.29 www 511:
1.73 www 512: sub hiddenurls {
1.31 www 513: my $randomoutentry='';
1.29 www 514: foreach my $rid (keys %randompick) {
515: my $rndpick=$randompick{$rid};
516: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
517: # ------------------------------------------- put existing resources into array
518: my @currentrids=();
1.106 albertel 519: foreach my $key (sort(keys(%hash))) {
520: if ($key=~/^src_($mpc\.\d+)/) {
1.29 www 521: if ($hash{'src_'.$1}) { push @currentrids, $1; }
522: }
523: }
1.50 albertel 524: # rids are number.number and we want to numercially sort on
525: # the second number
526: @currentrids=sort {
527: my (undef,$aid)=split(/\./,$a);
528: my (undef,$bid)=split(/\./,$b);
529: $aid <=> $bid;
530: } @currentrids;
1.29 www 531: next if ($#currentrids<$rndpick);
532: # -------------------------------- randomly eliminate the ones that should stay
1.50 albertel 533: my (undef,$id)=split(/\./,$rid);
1.51 www 534: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1.50 albertel 535: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1.58 albertel 536: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1.50 albertel 537: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
538: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
539: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1.29 www 540: # -------------------------------------------------------- delete the leftovers
541: for (my $k=0; $k<=$#currentrids; $k++) {
542: if ($currentrids[$k]) {
543: $hash{'randomout_'.$currentrids[$k]}=1;
1.32 www 544: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
545: $randomoutentry.='&'.
1.86 albertel 546: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
547: $resid,
548: $hash{'src_'.$currentrids[$k]}
549: ).'&';
1.29 www 550: }
551: }
1.31 www 552: }
1.73 www 553: # ------------------------------ take care of explicitly hidden urls or folders
554: foreach my $rid (keys %hiddenurl) {
555: $hash{'randomout_'.$rid}=1;
556: my ($mapid,$resid)=split(/\./,$rid);
557: $randomoutentry.='&'.
1.86 albertel 558: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
559: $hash{'src_'.$rid}).'&';
1.73 www 560: }
561: # --------------------------------------- append randomout entry to environment
1.31 www 562: if ($randomoutentry) {
563: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry);
1.29 www 564: }
565: }
566:
1.1 www 567: # ---------------------------------------------------- Read map and all submaps
568:
569: sub readmap {
1.85 albertel 570: my $short=shift;
571: $short=~s/^\///;
1.108 albertel 572: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
1.85 albertel 573: my $fn=$cenv{'fn'};
574: my $uri;
575: $short=~s/\//\_/g;
576: unless ($uri=$cenv{'url'}) {
577: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
578: "Could not load course $short.</font>");
1.114 www 579: return ('',&mt('No course data available.'));;
1.85 albertel 580: }
581: @cond=('true:normal');
1.96 albertel 582:
583: open(LOCKFILE,">$fn.db.lock");
584: my $lock=0;
585: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
586: $lock=1;
587: unlink($fn.'.db');
588: unlink($fn.'_symb.db');
589: unlink($fn.'.state');
590: unlink($fn.'parms.db');
591: }
1.85 albertel 592: undef %randompick;
593: undef %hiddenurl;
594: undef %encurl;
1.116 www 595: $retfrid='';
1.96 albertel 596: if ($lock && (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) &&
1.85 albertel 597: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) {
598: %hash=();
599: %parmhash=();
600: $errtext='';
601: $pc=0;
602: &processversionfile(%cenv);
603: my $furi=&Apache::lonnet::clutter($uri);
604: $hash{'src_0.0'}=&versiontrack($furi);
605: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
606: $hash{'ids_'.$furi}='0.0';
607: $hash{'is_map_0.0'}=1;
608: loadmap($uri);
609: if (defined($hash{'map_start_'.$uri})) {
610: &Apache::lonnet::appenv("request.course.id" => $short,
611: "request.course.fn" => $fn,
612: "request.course.uri" => $uri);
1.116 www 613: $env{'request.course.id'}=$short;
1.85 albertel 614: &traceroute('0',$hash{'map_start_'.$uri},'&');
615: &accinit($uri,$short,$fn);
616: &hiddenurls();
617: }
1.62 www 618: # ------------------------------------------------------- Put versions into src
1.106 albertel 619: foreach my $key (keys(%hash)) {
1.110 albertel 620: if ($key=~/^src_/) {
1.106 albertel 621: $hash{$key}=&putinversion($hash{$key});
1.110 albertel 622: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
623: my ($type, $url) = ($1,$2);
624: my $value = $hash{$key};
625: $hash{$type.&putinversion($url)}=$value;
1.85 albertel 626: }
1.61 www 627: }
1.74 www 628: # ---------------------------------------------------------------- Encrypt URLs
1.106 albertel 629: foreach my $id (keys(%encurl)) {
630: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
631: $hash{'encrypted_'.$id}=1;
1.85 albertel 632: }
1.74 www 633: # ----------------------------------------------- Close hashes to finally store
634: # --------------------------------- Routine must pass this point, no early outs
1.116 www 635: $hash{'first_rid'}=$retfrid;
636: my ($mapid,$resid)=split(/\./,$retfrid);
637: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
638: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
639: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
640: if ($hash{'encrypted_'.$retfrid}) {
641: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
642: }
1.94 albertel 643: $hash{'first_url'}=$retfurl;
1.85 albertel 644: unless ((untie(%hash)) && (untie(%parmhash))) {
645: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
646: "Could not untie coursemap $fn for $uri.</font>");
647: }
648: # ---------------------------------------------------- Store away initial state
649: {
650: my $cfh;
1.88 raeburn 651: if (open($cfh,">$fn.state")) {
1.85 albertel 652: print $cfh join("\n",@cond);
653: } else {
654: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
655: "Could not write statemap $fn for $uri.</font>");
656: }
1.96 albertel 657: }
658: flock(LOCKFILE,LOCK_UN);
659: close(LOCKFILE);
1.85 albertel 660: } else {
1.87 albertel 661: # if we are here it is likely because we are already trying to
662: # initialize the course in another child, busy wait trying to
663: # tie the hashes for the next 90 seconds, if we succeed forward
664: # them on to navmaps, if we fail, throw up the Could not init
665: # course screen
1.96 albertel 666: if ($lock) {
667: # Got the lock but not the DB files
668: flock(LOCKFILE,LOCK_UN);
669: }
1.87 albertel 670: untie(%hash);
671: untie(%parmhash);
1.85 albertel 672: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
673: "Could not tie coursemap $fn for $uri.</font>");
1.87 albertel 674: my $i=0;
675: while($i<90) {
676: $i++;
677: sleep(1);
1.96 albertel 678: if (flock(LOCKFILE,LOCK_EX|LOCK_NB) &&
679: (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640))) {
1.87 albertel 680: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
681: $retfurl='/adm/navmaps';
682: &Apache::lonnet::appenv("request.course.id" => $short,
683: "request.course.fn" => $fn,
684: "request.course.uri" => $uri);
685: untie(%hash);
686: untie(%parmhash);
687: last;
688: }
689: }
690: untie(%hash);
691: untie(%parmhash);
692: }
1.96 albertel 693: flock(LOCKFILE,LOCK_UN);
694: close(LOCKFILE);
1.1 www 695: }
1.89 albertel 696: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},$errtext);
1.46 www 697: # ------------------------------------------------- Check for critical messages
698:
1.89 albertel 699: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
700: $env{'user.name'});
1.46 www 701: if ($what[0]) {
702: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
703: $retfurl='/adm/email?critical=display';
704: }
705: }
1.85 albertel 706: return ($retfurl,$errtext);
1.1 www 707: }
1.15 www 708:
709: # ------------------------------------------------------- Evaluate state string
710:
711: sub evalstate {
1.89 albertel 712: my $fn=$env{'request.course.fn'}.'.state';
1.80 albertel 713: my $state='';
1.15 www 714: if (-e $fn) {
1.80 albertel 715: my @conditions=();
716: {
1.115 raeburn 717: open(my $fh,"<$fn");
1.80 albertel 718: @conditions=<$fh>;
1.115 raeburn 719: close($fh);
1.80 albertel 720: }
721: my $safeeval = new Safe;
722: my $safehole = new Safe::Hole;
723: $safeeval->permit("entereval");
724: $safeeval->permit(":base_math");
725: $safeeval->deny(":base_io");
726: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
727: foreach my $line (@conditions) {
728: chomp($line);
729: my ($condition,$weight)=split(/\:/,$line);
730: if ($safeeval->reval($condition)) {
731: if ($weight eq 'force') {
732: $state.='3';
733: } else {
734: $state.='2';
735: }
736: } else {
737: if ($weight eq 'stop') {
738: $state.='0';
739: } else {
740: $state.='1';
741: }
742: }
743: }
1.15 www 744: }
1.89 albertel 745: &Apache::lonnet::appenv('user.state.'.$env{'request.course.id'} => $state);
1.15 www 746: return $state;
747: }
748:
1.1 www 749: 1;
750: __END__
751:
1.26 harris41 752: =head1 NAME
753:
754: Apache::lonuserstate - Construct and maintain state and binary representation
755: of course for user
756:
757: =head1 SYNOPSIS
758:
759: Invoked by lonroles.pm.
760:
761: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
762:
763: =head1 INTRODUCTION
764:
765: This module constructs and maintains state and binary representation
766: of course for user.
767:
768: This is part of the LearningOnline Network with CAPA project
769: described at http://www.lon-capa.org.
770:
771: =head1 HANDLER SUBROUTINE
772:
773: There is no handler subroutine.
774:
775: =head1 OTHER SUBROUTINES
776:
777: =over 4
778:
779: =item *
780:
781: loadmap() : Loads map from disk
782:
783: =item *
784:
785: simplify() : Simplify expression
786:
787: =item *
788:
789: traceroute() : Build condition hash
790:
791: =item *
792:
793: accinit() : Cascading conditions, quick access, parameters
1.1 www 794:
1.26 harris41 795: =item *
1.1 www 796:
1.26 harris41 797: readmap() : Read map and all submaps
1.1 www 798:
1.26 harris41 799: =item *
1.1 www 800:
1.26 harris41 801: evalstate() : Evaluate state string
1.1 www 802:
1.26 harris41 803: =back
1.1 www 804:
1.26 harris41 805: =cut
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