![]() ![]() | ![]() |
Continued work on hidden and encrypted URLs
1: # The LearningOnline Network with CAPA 2: # Construct and maintain state and binary representation of course for user 3: # 4: # $Id: lonuserstate.pm,v 1.74 2004/04/23 15:43:41 www 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: 30: package Apache::lonuserstate; 31: 32: # ------------------------------------------------- modules used by this module 33: use strict; 34: use Apache::Constants qw(:common :http); 35: use Apache::File; 36: use HTML::TokeParser; 37: use Apache::lonnet(); 38: use Apache::loncommon(); 39: use GDBM_File; 40: use Apache::lonmsg; 41: use Safe; 42: use Safe::Hole; 43: use Opcode; 44: use Apache::lonenc; 45: 46: # ---------------------------------------------------- Globals for this package 47: 48: my $pc; # Package counter 49: my %hash; # The big tied hash 50: my %parmhash;# The hash with the parameters 51: my @cond; # Array with all of the conditions 52: my $errtext; # variable with all errors 53: my $retfurl; # variable with the very first URL in the course 54: my %randompick; # randomly picked resources 55: my %randompickseed; # optional seed for randomly picking resources 56: my %encurl; # URLs in this folder are supposed to be encrypted 57: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden 58: 59: # ----------------------------------- Remove version from URL and store in hash 60: 61: sub versiontrack { 62: my $uri=shift; 63: if ($uri=~/\.(\d+)\.\w+$/) { 64: my $version=$1; 65: $uri=~s/\.\d+\.(\w+)$/\.$1/; 66: unless ($hash{'version_'.$uri}) { 67: $hash{'version_'.$uri}=$version; 68: } 69: } 70: return $uri; 71: } 72: 73: # -------------------------------------------------------------- Put in version 74: 75: sub putinversion { 76: my $uri=shift; 77: if ($hash{'version_'.$uri}) { 78: my $version=$hash{'version_'.$uri}; 79: if ($version eq 'mostrecent') { return $uri; } 80: if ($version eq &Apache::lonnet::getversion( 81: &Apache::lonnet::filelocation('',$uri))) 82: { return $uri; } 83: $uri=~s/\.(\w+)$/\.$version\.$1/; 84: } 85: return $uri; 86: } 87: 88: # ----------------------------------------- Processing versions file for course 89: 90: sub processversionfile { 91: my %cenv=@_; 92: my %versions=&Apache::lonnet::dump('resourceversions', 93: $cenv{'domain'}, 94: $cenv{'num'}); 95: foreach (keys %versions) { 96: if ($_=~/^error\:/) { return; } 97: $hash{'version_'.$_}=$versions{$_}; 98: } 99: } 100: 101: # --------------------------------------------------------- Loads map from disk 102: 103: sub loadmap { 104: my $uri=shift; 105: if ($hash{'map_pc_'.$uri}) { return OK; } 106: 107: $pc++; 108: my $lpc=$pc; 109: $hash{'map_pc_'.$uri}=$lpc; 110: $hash{'map_id_'.$lpc}=$uri; 111: 112: # Determine and check filename 113: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri)); 114: 115: my $ispage=($fn=~/\.page$/); 116: 117: unless (($fn=~/\.sequence$/) || 118: ($fn=~/\.page$/)) { 119: $errtext.="Invalid map: $fn\n"; 120: return OK; 121: } 122: 123: my $instr=&Apache::lonnet::getfile($fn); 124: 125: unless ($instr eq -1) { 126: 127: # Successfully got file, parse it 128: 129: my $parser = HTML::TokeParser->new(\$instr); 130: my $token; 131: 132: my $linkpc=0; 133: 134: $fn=~/\.(\w+)$/; 135: 136: $hash{'map_type_'.$lpc}=$1; 137: 138: while ($token = $parser->get_token) { 139: if ($token->[0] eq 'S') { 140: if ($token->[1] eq 'resource') { 141: # -------------------------------------------------------------------- Resource 142: 143: my $rid=$lpc.'.'.$token->[2]->{'id'}; 144: 145: $hash{'kind_'.$rid}='res'; 146: $hash{'title_'.$rid}=$token->[2]->{'title'}; 147: my $turi=&versiontrack($token->[2]->{'src'}); 148: if ($token->[2]->{'version'}) { 149: unless ($hash{'version_'.$turi}) { 150: $hash{'version_'.$turi}=$1; 151: } 152: } 153: &Apache::lonnet::do_cache(\%Apache::lonnet::titlecache, 154: &Apache::lonnet::encode_symb($uri,$token->[2]->{'id'}, 155: $turi), 156: $token->[2]->{'title'},'title'); 157: unless ($ispage) { 158: $turi=~/\.(\w+)$/; 159: my $embstyle=&Apache::loncommon::fileembstyle($1); 160: if ($token->[2]->{'external'} eq 'true') { # external 161: $turi=~s/^http\:\/\//\/adm\/wrapper\/ext\//; 162: } elsif ($turi=~/^\/*uploaded\//) { # uploaded 163: if (($embstyle eq 'img') || ($embstyle eq 'emb') 164: || ($embstyle eq 'ssi')) { 165: unless ($turi =~/\.page$/) { 166: $turi='/adm/wrapper'.$turi; 167: } 168: } elsif ($turi!~/\.(sequence|page)$/) { 169: $turi='/adm/coursedocs/showdoc'.$turi; 170: } 171: } elsif ($turi=~/\S/) { # normal non-empty internal resource 172: my $mapdir=$uri; 173: $mapdir=~s/[^\/]+$//; 174: $turi=&Apache::lonnet::hreflocation($mapdir,$turi); 175: if (($embstyle eq 'img') || ($embstyle eq 'emb')) { 176: $turi='/adm/wrapper'.$turi; 177: } 178: } 179: } 180: # Store reverse lookup, remove query string 181: my $idsuri=$turi; 182: $idsuri=~s/\?.+$//; 183: if (defined($hash{'ids_'.$idsuri})) { 184: $hash{'ids_'.$idsuri}.=','.$rid; 185: } else { 186: $hash{'ids_'.$idsuri}=''.$rid; 187: } 188: 189: if 190: ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard)$/) { 191: $turi.='?register=1'; 192: } 193: 194: $hash{'src_'.$rid}=$turi; 195: 196: if ($token->[2]->{'external'} eq 'true') { 197: $hash{'ext_'.$rid}='true:'; 198: } else { 199: $hash{'ext_'.$rid}='false:'; 200: } 201: if ($token->[2]->{'type'}) { 202: $hash{'type_'.$rid}=$token->[2]->{'type'}; 203: if ($token->[2]->{'type'} eq 'start') { 204: $hash{'map_start_'.$uri}="$rid"; 205: } 206: if ($token->[2]->{'type'} eq 'finish') { 207: $hash{'map_finish_'.$uri}="$rid"; 208: } 209: } else { 210: $hash{'type_'.$rid}='normal'; 211: } 212: 213: if (($turi=~/\.sequence$/) || 214: ($turi=~/\.page$/)) { 215: $hash{'is_map_'.$rid}=1; 216: &loadmap($turi); 217: } 218: 219: } elsif ($token->[1] eq 'condition') { 220: # ------------------------------------------------------------------- Condition 221: 222: my $rid=$lpc.'.'.$token->[2]->{'id'}; 223: 224: $hash{'kind_'.$rid}='cond'; 225: $cond[$#cond+1]=$token->[2]->{'value'}; 226: $hash{'condid_'.$rid}=$#cond; 227: if ($token->[2]->{'type'}) { 228: $cond[$#cond].=':'.$token->[2]->{'type'}; 229: } else { 230: $cond[$#cond].=':normal'; 231: } 232: 233: } elsif ($token->[1] eq 'link') { 234: # ----------------------------------------------------------------------- Links 235: 236: $linkpc++; 237: my $linkid=$lpc.'.'.$linkpc; 238: 239: my $goesto=$lpc.'.'.$token->[2]->{'to'}; 240: my $comesfrom=$lpc.'.'.$token->[2]->{'from'}; 241: my $undercond=0; 242: 243: if ($token->[2]->{'condition'}) { 244: $undercond=$lpc.'.'.$token->[2]->{'condition'}; 245: } 246: 247: $hash{'goesto_'.$linkid}=$goesto; 248: $hash{'comesfrom_'.$linkid}=$comesfrom; 249: $hash{'undercond_'.$linkid}=$undercond; 250: 251: if (defined($hash{'to_'.$comesfrom})) { 252: $hash{'to_'.$comesfrom}.=','.$linkid; 253: } else { 254: $hash{'to_'.$comesfrom}=''.$linkid; 255: } 256: if (defined($hash{'from_'.$goesto})) { 257: $hash{'from_'.$goesto}.=','.$linkid; 258: } else { 259: $hash{'from_'.$goesto}=''.$linkid; 260: } 261: } elsif ($token->[1] eq 'param') { 262: # ------------------------------------------------------------------- Parameter 263: 264: my $referid=$lpc.'.'.$token->[2]->{'to'}; 265: my $name=$token->[2]->{'name'}; 266: my $part; 267: if ($name=~/^parameter_(.*)_/) { 268: $part=$1; 269: } else { 270: $part=0; 271: } 272: $name=~s/^.*_([^_]*)$/$1/; 273: my $newparam= 274: &Apache::lonnet::escape($token->[2]->{'type'}).':'. 275: &Apache::lonnet::escape($part.'.'.$name).'='. 276: &Apache::lonnet::escape($token->[2]->{'value'}); 277: if (defined($hash{'param_'.$referid})) { 278: $hash{'param_'.$referid}.='&'.$newparam; 279: } else { 280: $hash{'param_'.$referid}=''.$newparam; 281: } 282: if ($token->[2]->{'name'} eq 'parameter_mapalias') { 283: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid; 284: } 285: if ($token->[2]->{'name'} eq 'parameter_randompick') { 286: $randompick{$referid}=$token->[2]->{'value'}; 287: } 288: if ($token->[2]->{'name'} eq 'parameter_randompickseed') { 289: $randompick{$referid}=$token->[2]->{'value'}; 290: } 291: if ($token->[2]->{'name'} eq 'parameter_encrypturl') { 292: if ($token->[2]->{'value'}=~/^yes$/i) { 293: $encurl{$referid}=1; 294: } 295: } 296: if ($token->[2]->{'name'} eq 'parameter_hiddenresource') { 297: if ($token->[2]->{'value'}=~/^yes$/i) { 298: $hiddenurl{$referid}=1; 299: } 300: } 301: } 302: 303: } 304: } 305: 306: } else { 307: $errtext.='Map not loaded: The file does not exist. '; 308: } 309: } 310: 311: # --------------------------------------------------------- Simplify expression 312: 313: sub simplify { 314: my $expression=shift; 315: # (8)=8 316: $expression=~s/\((\d+)\)/$1/g; 317: # 8&8=8 318: $expression=~s/(\D)(\d+)\&\2(\D)/$1$2$3/g; 319: # 8|8=8 320: $expression=~s/(\D)(\d+)\|\2(\D)/$1$2$3/g; 321: # (5&3)&4=5&3&4 322: $expression=~s/\((\d+)((?:\&\d+)+)\)\&(\d+\D)/$1$2\&$3/g; 323: # (((5&3)|(4&6)))=((5&3)|(4&6)) 324: $expression=~ 325: s/\((\(\(\d+(?:\&\d+)*\)(?:\|\(\d+(?:\&\d+)*\))+\))\)/$1/g; 326: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2) 327: $expression=~ 328: s/\((\(\d+(?:\&\d+)*\))((?:\|\(\d+(?:\&\d+)*\))+)\)\|(\(\d+(?:\&\d+)*\))/\($1$2\|$3\)/g; 329: return $expression; 330: } 331: 332: # -------------------------------------------------------- Build condition hash 333: 334: sub traceroute { 335: my ($sofar,$rid,$beenhere)=@_; 336: $sofar=simplify($sofar); 337: unless ($beenhere=~/\&$rid\&/) { 338: $beenhere.=$rid.'&'; 339: if (($retfurl eq '') && ($hash{'src_'.$rid}) 340: && ($hash{'src_'.$rid}!~/\.sequence$/)) { 341: my ($mapid,$resid)=split(/\./,$rid); 342: $retfurl=$hash{'src_'.$rid}. 343: (($hash{'src_'.$rid}=~/\?/)?'&':'?').'symb='. 344: &Apache::lonnet::symbclean( 345: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}). 346: '___'.$resid.'___'. 347: &Apache::lonnet::declutter($hash{'src_'.$rid})); 348: } 349: if (defined($hash{'conditions_'.$rid})) { 350: $hash{'conditions_'.$rid}=simplify( 351: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')'); 352: } else { 353: $hash{'conditions_'.$rid}=$sofar; 354: } 355: if (defined($hash{'is_map_'.$rid})) { 356: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) { 357: &traceroute($sofar,$hash{'map_start_'.$hash{'src_'.$rid}},'&'); 358: if (defined($hash{'map_finish_'.$hash{'src_'.$rid}})) { 359: $sofar= 360: $hash{'conditions_'.$hash{'map_finish_'.$hash{'src_'.$rid}}}; 361: } 362: } 363: } 364: if (defined($hash{'to_'.$rid})) { 365: foreach (split(/\,/,$hash{'to_'.$rid})) { 366: my $further=$sofar; 367: if ($hash{'undercond_'.$_}) { 368: if (defined($hash{'condid_'.$hash{'undercond_'.$_}})) { 369: $further=simplify('('.$further.')&('. 370: $hash{'condid_'.$hash{'undercond_'.$_}}.')'); 371: } else { 372: $errtext.='Undefined condition ID: ' 373: .$hash{'undercond_'.$_}.'. '; 374: } 375: } 376: &traceroute($further,$hash{'goesto_'.$_},$beenhere); 377: } 378: } 379: } 380: } 381: 382: # ------------------------------ Cascading conditions, quick access, parameters 383: 384: sub accinit { 385: my ($uri,$short,$fn)=@_; 386: my %acchash=(); 387: my %captured=(); 388: my $condcounter=0; 389: $acchash{'acc.cond.'.$short.'.0'}=0; 390: foreach (keys %hash) { 391: if ($_=~/^conditions/) { 392: my $expr=$hash{$_}; 393: foreach ($expr=~m/(\(\(\d+(?:\&\d+)+\)(?:\|\(\d+(?:\&\d+)+\))+\))/g) { 394: my $sub=$_; 395: my $orig=$_; 396: $sub=~/\(\((\d+\&(:?\d+\&)*)(?:\d+\&*)+\)(?:\|\(\1(?:\d+\&*)+\))+\)/; 397: my $factor=$1; 398: $sub=~s/$factor//g; 399: $sub=~s/^\(/\($factor\(/; 400: $sub.=')'; 401: $sub=simplify($sub); 402: $orig=~s/(\W)/\\$1/g; 403: $expr=~s/$orig/$sub/; 404: } 405: $hash{$_}=$expr; 406: unless (defined($captured{$expr})) { 407: $condcounter++; 408: $captured{$expr}=$condcounter; 409: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr; 410: } 411: } elsif ($_=~/^param_(\d+)\.(\d+)/) { 412: my $prefix=&Apache::lonnet::declutter($hash{'map_id_'.$1}). 413: '___'.$2.'___'.&Apache::lonnet::declutter($hash{'src_'.$1.'.'.$2}); 414: foreach (split(/\&/,$hash{$_})) { 415: my ($typename,$value)=split(/\=/,$_); 416: my ($type,$name)=split(/\:/,$typename); 417: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name)}= 418: &Apache::lonnet::unescape($value); 419: $parmhash{$prefix.'.'.&Apache::lonnet::unescape($name).'.type'}= 420: &Apache::lonnet::unescape($type); 421: } 422: } 423: } 424: foreach (keys %hash) { 425: if ($_=~/^ids/) { 426: foreach (split(/\,/,$hash{$_})) { 427: my $resid=$_; 428: my $uri=$hash{'src_'.$resid}; 429: $uri=~s/^\/adm\/wrapper//; 430: $uri=&Apache::lonnet::declutter($uri); 431: my @uriparts=split(/\//,$uri); 432: my $urifile=$uriparts[$#uriparts]; 433: $#uriparts--; 434: my $uripath=join('/',@uriparts); 435: if ($uripath) { 436: my $uricond='0'; 437: if (defined($hash{'conditions_'.$resid})) { 438: $uricond=$captured{$hash{'conditions_'.$resid}}; 439: } 440: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) { 441: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~ 442: /(\&\Q$urifile\E\:[^\&]*)/) { 443: my $replace=$1; 444: my $regexp=$replace; 445: $regexp=~s/\|/\\\|/g; 446: $acchash{'acc.res.'.$short.'.'.$uripath} 447: =~s/$regexp/$replace\|$uricond/; 448: } else { 449: $acchash{'acc.res.'.$short.'.'.$uripath}.= 450: $urifile.':'.$uricond.'&'; 451: } 452: } else { 453: $acchash{'acc.res.'.$short.'.'.$uripath}= 454: '&'.$urifile.':'.$uricond.'&'; 455: } 456: } 457: } 458: } 459: } 460: $acchash{'acc.res.'.$short.'.'}='&:0&'; 461: my $courseuri=$uri; 462: $courseuri=~s/^\/res\///; 463: &Apache::lonnet::delenv('(acc\.|httpref\.)'); 464: &Apache::lonnet::appenv(%acchash, 465: "request.course.id" => $short, 466: "request.course.fn" => $fn, 467: "request.course.uri" => $courseuri); 468: } 469: 470: # ---------------- Selectively delete from randompick maps and hidden url parms 471: 472: sub hiddenurls { 473: my $randomoutentry=''; 474: foreach my $rid (keys %randompick) { 475: my $rndpick=$randompick{$rid}; 476: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}}; 477: # ------------------------------------------- put existing resources into array 478: my @currentrids=(); 479: foreach (sort(keys(%hash))) { 480: if ($_=~/^src_($mpc\.\d+)/) { 481: if ($hash{'src_'.$1}) { push @currentrids, $1; } 482: } 483: } 484: # rids are number.number and we want to numercially sort on 485: # the second number 486: @currentrids=sort { 487: my (undef,$aid)=split(/\./,$a); 488: my (undef,$bid)=split(/\./,$b); 489: $aid <=> $bid; 490: } @currentrids; 491: next if ($#currentrids<$rndpick); 492: # -------------------------------- randomly eliminate the ones that should stay 493: my (undef,$id)=split(/\./,$rid); 494: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; } 495: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb 496: &Apache::lonnet::setup_random_from_rndseed($rndseed); 497: my @whichids=&Math::Random::random_permuted_index($#currentrids+1); 498: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; } 499: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids)); 500: # -------------------------------------------------------- delete the leftovers 501: for (my $k=0; $k<=$#currentrids; $k++) { 502: if ($currentrids[$k]) { 503: $hash{'randomout_'.$currentrids[$k]}=1; 504: my ($mapid,$resid)=split(/\./,$currentrids[$k]); 505: $randomoutentry.='&'. 506: &Apache::lonnet::symbclean( 507: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}). 508: '___'.$resid.'___'. 509: &Apache::lonnet::declutter($hash{'src_'.$currentrids[$k]}) 510: ).'&'; 511: } 512: } 513: } 514: # ------------------------------ take care of explicitly hidden urls or folders 515: foreach my $rid (keys %hiddenurl) { 516: $hash{'randomout_'.$rid}=1; 517: my ($mapid,$resid)=split(/\./,$rid); 518: $randomoutentry.='&'. 519: &Apache::lonnet::symbclean( 520: &Apache::lonnet::declutter($hash{'map_id_'.$mapid}). 521: '___'.$resid.'___'. 522: &Apache::lonnet::declutter($hash{'src_'.$rid}) 523: ).'&'; 524: } 525: # --------------------------------------- append randomout entry to environment 526: if ($randomoutentry) { 527: &Apache::lonnet::appenv('acc.randomout' => $randomoutentry); 528: } 529: } 530: 531: # ---------------------------------------------------- Read map and all submaps 532: 533: sub readmap { 534: my $short=shift; 535: $short=~s/^\///; 536: my %cenv=&Apache::lonnet::coursedescription($short); 537: my $fn=$cenv{'fn'}; 538: my $uri; 539: $short=~s/\//\_/g; 540: unless ($uri=$cenv{'url'}) { 541: &Apache::lonnet::logthis("<font color=blue>WARNING: ". 542: "Could not load course $short.</font>"); 543: return 'No course data available.'; 544: } 545: @cond=('true:normal'); 546: unlink($fn.'.db'); 547: unlink($fn.'_symb.db'); 548: unlink($fn.'.state'); 549: unlink($fn.'parms.db'); 550: undef %randompick; 551: undef %hiddenurl; 552: undef %encurl; 553: $retfurl=''; 554: if ((tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) && 555: (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640))) { 556: %hash=(); 557: %parmhash=(); 558: $errtext=''; 559: $pc=0; 560: &processversionfile(%cenv); 561: my $furi=&Apache::lonnet::clutter($uri); 562: $hash{'src_0.0'}=&versiontrack($furi); 563: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title'); 564: $hash{'ids_'.$furi}='0.0'; 565: $hash{'is_map_0.0'}=1; 566: loadmap($uri); 567: if (defined($hash{'map_start_'.$uri})) { 568: &traceroute('0',$hash{'map_start_'.$uri},'&'); 569: &accinit($uri,$short,$fn); 570: &hiddenurls(); 571: } 572: # ------------------------------------------------------- Put versions into src 573: foreach (keys %hash) { 574: if ($_=~/^src\_/) { 575: $hash{$_}=&putinversion($hash{$_}); 576: } 577: } 578: # ---------------------------------------------------------------- Encrypt URLs 579: foreach (keys %encurl) { 580: $hash{'src_'.$_}=&Apache::lonenc::encrypted($hash{'src_'.$_}); 581: } 582: # ----------------------------------------------- Close hashes to finally store 583: # --------------------------------- Routine must pass this point, no early outs 584: unless ((untie(%hash)) && (untie(%parmhash))) { 585: &Apache::lonnet::logthis("<font color=blue>WARNING: ". 586: "Could not untie coursemap $fn for $uri.</font>"); 587: } 588: # ---------------------------------------------------- Store away initial state 589: { 590: my $cfh; 591: if ($cfh=Apache::File->new(">$fn.state")) { 592: print $cfh join("\n",@cond); 593: } else { 594: &Apache::lonnet::logthis("<font color=blue>WARNING: ". 595: "Could not write statemap $fn for $uri.</font>"); 596: } 597: } 598: } else { 599: &Apache::lonnet::logthis("<font color=blue>WARNING: ". 600: "Could not tie coursemap $fn for $uri.</font>"); 601: } 602: &Apache::lonmsg::author_res_msg($ENV{'request.course.uri'},$errtext); 603: # ------------------------------------------------- Check for critical messages 604: 605: my @what=&Apache::lonnet::dump('critical',$ENV{'user.domain'}, 606: $ENV{'user.name'}); 607: if ($what[0]) { 608: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { 609: $retfurl='/adm/email?critical=display'; 610: } 611: } 612: return ($retfurl,$errtext); 613: } 614: 615: # ------------------------------------------------------- Evaluate state string 616: 617: sub evalstate { 618: 619: my $fn=$ENV{'request.course.fn'}.'.state'; 620: my $state='2'; 621: if (-e $fn) { 622: my @conditions=(); 623: { 624: my $fh=Apache::File->new($fn); 625: @conditions=<$fh>; 626: } 627: my $safeeval = new Safe; 628: my $safehole = new Safe::Hole; 629: $safeeval->permit("entereval"); 630: $safeeval->permit(":base_math"); 631: $safeeval->deny(":base_io"); 632: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT'); 633: foreach (@conditions) { 634: my $line=$_; 635: chomp($line); 636: my ($condition,$weight)=split(/\:/,$_); 637: if ($safeeval->reval($condition)) { 638: if ($weight eq 'force') { 639: $state.='3'; 640: } else { 641: $state.='2'; 642: } 643: } else { 644: if ($weight eq 'stop') { 645: $state.='0'; 646: } else { 647: $state.='1'; 648: } 649: } 650: } 651: } 652: &Apache::lonnet::appenv('user.state.'.$ENV{'request.course.id'} => $state); 653: return $state; 654: } 655: 656: 1; 657: __END__ 658: 659: =head1 NAME 660: 661: Apache::lonuserstate - Construct and maintain state and binary representation 662: of course for user 663: 664: =head1 SYNOPSIS 665: 666: Invoked by lonroles.pm. 667: 668: &Apache::lonuserstate::readmap($cdom.'/'.$cnum); 669: 670: =head1 INTRODUCTION 671: 672: This module constructs and maintains state and binary representation 673: of course for user. 674: 675: This is part of the LearningOnline Network with CAPA project 676: described at http://www.lon-capa.org. 677: 678: =head1 HANDLER SUBROUTINE 679: 680: There is no handler subroutine. 681: 682: =head1 OTHER SUBROUTINES 683: 684: =over 4 685: 686: =item * 687: 688: loadmap() : Loads map from disk 689: 690: =item * 691: 692: simplify() : Simplify expression 693: 694: =item * 695: 696: traceroute() : Build condition hash 697: 698: =item * 699: 700: accinit() : Cascading conditions, quick access, parameters 701: 702: =item * 703: 704: readmap() : Read map and all submaps 705: 706: =item * 707: 708: evalstate() : Evaluate state string 709: 710: =back 711: 712: =cut