Annotation of rat/lonuserstate.pm, revision 1.138
1.1 www 1: # The LearningOnline Network with CAPA
2: # Construct and maintain state and binary representation of course for user
3: #
1.138 ! foxr 4: # $Id: lonuserstate.pm,v 1.137 2011/04/21 13:28:50 raeburn 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;
1.138 ! foxr 46: use File::Basename;
! 47:
1.114 www 48:
1.15 www 49:
1.1 www 50: # ---------------------------------------------------- Globals for this package
51:
1.138 ! foxr 52: my $pc; # Package counter is this what 'Guts' calls the map counter?
1.1 www 53: my %hash; # The big tied hash
1.19 www 54: my %parmhash;# The hash with the parameters
1.1 www 55: my @cond; # Array with all of the conditions
56: my $errtext; # variable with all errors
1.116 www 57: my $retfrid; # variable with the very first RID in the course
58: my $retfurl; # first URL
1.29 www 59: my %randompick; # randomly picked resources
1.51 www 60: my %randompickseed; # optional seed for randomly picking resources
1.124 albertel 61: my %randomorder; # maps to order contents randomly
1.73 www 62: my %encurl; # URLs in this folder are supposed to be encrypted
63: my %hiddenurl; # this URL (or complete folder) is supposed to be hidden
1.61 www 64:
65: # ----------------------------------- Remove version from URL and store in hash
66:
1.134 www 67: sub versionerror {
68: my ($uri,$usedversion,$unusedversion)=@_;
69: return '<br />'.&mt('Version discrepancy: resource [_1] included in both version [_2] and version [_3]. Using version [_2].',
70: $uri,$usedversion,$unusedversion).'<br />';
71: }
72:
1.61 www 73: sub versiontrack {
74: my $uri=shift;
75: if ($uri=~/\.(\d+)\.\w+$/) {
76: my $version=$1;
77: $uri=~s/\.\d+\.(\w+)$/\.$1/;
1.62 www 78: unless ($hash{'version_'.$uri}) {
79: $hash{'version_'.$uri}=$version;
1.134 www 80: } elsif ($version!=$hash{'version_'.$uri}) {
81: $errtext.=&versionerror($uri,$hash{'version_'.$uri},$version);
82: }
1.61 www 83: }
84: return $uri;
85: }
86:
87: # -------------------------------------------------------------- Put in version
88:
89: sub putinversion {
90: my $uri=shift;
1.93 www 91: my $key=$env{'request.course.id'}.'_'.&Apache::lonnet::clutter($uri);
1.61 www 92: if ($hash{'version_'.$uri}) {
93: my $version=$hash{'version_'.$uri};
1.65 www 94: if ($version eq 'mostrecent') { return $uri; }
1.66 www 95: if ($version eq &Apache::lonnet::getversion(
96: &Apache::lonnet::filelocation('',$uri)))
97: { return $uri; }
1.61 www 98: $uri=~s/\.(\w+)$/\.$version\.$1/;
99: }
1.93 www 100: &Apache::lonnet::do_cache_new('courseresversion',$key,&Apache::lonnet::declutter($uri),600);
1.61 www 101: return $uri;
102: }
103:
104: # ----------------------------------------- Processing versions file for course
105:
106: sub processversionfile {
1.64 www 107: my %cenv=@_;
1.61 www 108: my %versions=&Apache::lonnet::dump('resourceversions',
109: $cenv{'domain'},
110: $cenv{'num'});
1.106 albertel 111: foreach my $ver (keys(%versions)) {
112: if ($ver=~/^error\:/) { return; }
113: $hash{'version_'.$ver}=$versions{$ver};
1.61 www 114: }
115: }
1.45 www 116:
1.138 ! foxr 117: # --------------------------------------------------------- Loads from disk
1.1 www 118:
119: sub loadmap {
1.124 albertel 120: my ($uri,$parent_rid)=@_;
1.138 ! foxr 121:
! 122: # Is the map already included?
! 123:
1.114 www 124: if ($hash{'map_pc_'.$uri}) {
1.120 albertel 125: $errtext.='<p class="LC_error">'.
126: &mt('Multiple use of sequence/page [_1]! The course will not function properly.','<tt>'.$uri.'</tt>').
127: '</p>';
1.114 www 128: return;
129: }
1.138 ! foxr 130: # Register the resource in it's map_pc_ [for the URL]
! 131: # map_id.nnn is the nesting level -> to the URI.
! 132:
1.1 www 133: $pc++;
134: my $lpc=$pc;
135: $hash{'map_pc_'.$uri}=$lpc;
136: $hash{'map_id_'.$lpc}=$uri;
1.138 ! foxr 137:
! 138: # If the parent is of the form n.m hang this map underneath it in the
! 139: # map hierarchy.
! 140:
1.136 raeburn 141: if ($parent_rid =~ /^(\d+)\.\d+$/) {
142: my $parent_pc = $1;
143: if (defined($hash{'map_hierarchy_'.$parent_pc})) {
144: $hash{'map_hierarchy_'.$lpc}=$hash{'map_hierarchy_'.$parent_pc}.','.
145: $parent_pc;
146: } else {
147: $hash{'map_hierarchy_'.$lpc}=$parent_pc;
148: }
149: }
1.1 www 150:
1.138 ! foxr 151: # Determine and check filename of the sequence we need to read:
! 152:
1.62 www 153: my $fn=&Apache::lonnet::filelocation('',&putinversion($uri));
1.37 www 154:
155: my $ispage=($fn=~/\.page$/);
1.1 www 156:
1.138 ! foxr 157: # We can only nest sequences or pages. Anything else is an illegal nest.
! 158:
! 159: unless (($fn=~/\.sequence$/) || $ispage) {
1.114 www 160: $errtext.=&mt("<br />Invalid map: <tt>[_1]</tt>",$fn);
1.98 albertel 161: return;
1.1 www 162: }
163:
1.138 ! foxr 164: # Read the XML that constitutes the file.
! 165:
1.37 www 166: my $instr=&Apache::lonnet::getfile($fn);
167:
1.124 albertel 168: if ($instr eq -1) {
169: $errtext.=&mt('<br />Map not loaded: The file <tt>[_1]</tt> does not exist.',$fn);
170: return;
171: }
1.22 www 172:
1.138 ! foxr 173: # Successfully got file, parse it
! 174:
! 175: # parse for parameter processing.
! 176: # Note that these are <param... / > tags
! 177: # so we only care about 'S' (tag start) nodes.
! 178:
1.1 www 179:
1.124 albertel 180: my $parser = HTML::TokeParser->new(\$instr);
181: $parser->attr_encoded(1);
1.138 ! foxr 182:
1.124 albertel 183: # first get all parameters
1.138 ! foxr 184:
! 185:
1.124 albertel 186: while (my $token = $parser->get_token) {
187: next if ($token->[0] ne 'S');
188: if ($token->[1] eq 'param') {
189: &parse_param($token,$lpc);
190: }
191: }
1.138 ! foxr 192:
! 193: # Get set to take another pass through the XML:
! 194: # for resources and links.
! 195:
1.124 albertel 196: $parser = HTML::TokeParser->new(\$instr);
197: $parser->attr_encoded(1);
1.1 www 198:
1.124 albertel 199: my $linkpc=0;
1.1 www 200:
1.124 albertel 201: $fn=~/\.(\w+)$/;
1.1 www 202:
1.124 albertel 203: $hash{'map_type_'.$lpc}=$1;
1.1 www 204:
1.124 albertel 205: my $randomize = ($randomorder{$parent_rid} =~ /^yes$/i);
1.1 www 206:
1.138 ! foxr 207: # Parse the resources, link and condition tags.
! 208: # Note that if randomorder or random select is chosen the links and
! 209: # conditions are meaningless but are determined by the randomization.
! 210: # This is handled in the next chunk of code.
! 211:
1.124 albertel 212: my @map_ids;
213: while (my $token = $parser->get_token) {
214: next if ($token->[0] ne 'S');
1.138 ! foxr 215:
! 216: # Resource
! 217:
1.124 albertel 218: if ($token->[1] eq 'resource') {
1.138 ! foxr 219: my $resource_id = &parse_resource($token,$lpc,$ispage,$uri);
! 220: if (defined $resource_id) {
! 221: push(@map_ids, $resource_id);
! 222: }
! 223:
! 224: # Link
! 225:
1.124 albertel 226: } elsif ($token->[1] eq 'link' && !$randomize) {
227: &make_link(++$linkpc,$lpc,$token->[2]->{'to'},
228: $token->[2]->{'from'},
229: $token->[2]->{'condition'});
1.138 ! foxr 230:
! 231: # condition
! 232:
1.124 albertel 233: } elsif ($token->[1] eq 'condition' && !$randomize) {
234: &parse_condition($token,$lpc);
235: }
236: }
1.1 www 237:
1.138 ! foxr 238:
! 239: # Handle randomization and random selection
! 240:
1.124 albertel 241: if ($randomize) {
242: if (!$env{'request.role.adv'}) {
243: my $seed;
244: if (defined($randompickseed{$parent_rid})) {
245: $seed = $randompickseed{$parent_rid};
246: } else {
247: my ($mapid,$resid)=split(/\./,$parent_rid);
248: my $symb=
249: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
250: $resid,$hash{'src_'.$parent_rid});
1.85 albertel 251:
1.124 albertel 252: $seed = $symb;
253: }
1.138 ! foxr 254:
! 255: # Here for sure we need to pass along the username/domain
! 256: # so that we can impersonate users in lonprintout e.g.
! 257:
1.124 albertel 258: my $rndseed=&Apache::lonnet::rndseed($seed);
259: &Apache::lonnet::setup_random_from_rndseed($rndseed);
260: @map_ids=&Math::Random::random_permutation(@map_ids);
261: }
262: my $from = shift(@map_ids);
263: my $from_rid = $lpc.'.'.$from;
264: $hash{'map_start_'.$uri} = $from_rid;
265: $hash{'type_'.$from_rid}='start';
266:
267: while (my $to = shift(@map_ids)) {
268: &make_link(++$linkpc,$lpc,$to,$from);
269: my $to_rid = $lpc.'.'.$to;
270: $hash{'type_'.$to_rid}='normal';
271: $from = $to;
272: $from_rid = $to_rid;
273: }
1.1 www 274:
1.124 albertel 275: $hash{'map_finish_'.$uri}= $from_rid;
276: $hash{'type_'.$from_rid}='finish';
1.1 www 277: }
1.121 albertel 278:
1.127 albertel 279: $parser = HTML::TokeParser->new(\$instr);
1.121 albertel 280: $parser->attr_encoded(1);
281: # last parse out the mapalias params so as to ignore anything
282: # refering to non-existant resources
283: while (my $token = $parser->get_token) {
284: next if ($token->[0] ne 'S');
285: if ($token->[1] eq 'param') {
286: &parse_mapalias_param($token,$lpc);
287: }
288: }
289: }
290:
1.124 albertel 291:
292: # -------------------------------------------------------------------- Resource
1.138 ! foxr 293: #
! 294: # Parses a resource tag to produce the value to push into the
! 295: # map_ids array.
! 296: #
! 297: #
! 298: # Information about the actual type of resource is provided by the file extension
! 299: # of the uri (e.g. .problem, .sequence etc. etc.).
! 300: #
! 301: # Parameters:
! 302: # $token - A token from HTML::TokeParser
! 303: # This is an array that describes the most recently parsed HTML item.
! 304: # $lpc - Map nesting level (?)
! 305: # $ispage - True if this resource is encapsulated in a .page (assembled resourcde).
! 306: # $uri - URI of the enclosing resource.
! 307: # Returns:
! 308: #
! 309: # Note:
! 310: # The token is an array that contains the following elements:
! 311: # [0] => 'S' indicating this is a start token
! 312: # [1] => 'resource' indicating this tag is a <resource> tag.
! 313: # [2] => Hash of attribute =>value pairs.
! 314: # [3] => @(keys [2]).
! 315: # [4] => unused.
! 316: #
! 317: # The attributes of the resourcde tag include:
! 318: #
! 319: # id - The resource id.
! 320: # src - The URI of the resource.
! 321: # type - The resource type (e.g. start and finish).
! 322: # title - The resource title.
! 323:
! 324:
1.124 albertel 325: sub parse_resource {
326: my ($token,$lpc,$ispage,$uri) = @_;
1.138 ! foxr 327:
! 328: # I refuse to coutenance code like this that has
! 329: # such a dirty side effect (and forcing this sub to be called within a loop).
! 330: #
! 331: # if ($token->[2]->{'type'} eq 'zombie') { next; }
! 332:
! 333: # Zombie resources don't produce anything useful.
! 334:
! 335: if ($token->[2]->{'type'} eq 'zombie') {
! 336: return undef;
! 337: }
! 338:
1.124 albertel 339: my $rid=$lpc.'.'.$token->[2]->{'id'};
340:
341: $hash{'kind_'.$rid}='res';
342: $hash{'title_'.$rid}=$token->[2]->{'title'};
343: my $turi=&versiontrack($token->[2]->{'src'});
344: if ($token->[2]->{'version'}) {
345: unless ($hash{'version_'.$turi}) {
346: $hash{'version_'.$turi}=$1;
347: }
348: }
349: my $title=$token->[2]->{'title'};
350: $title=~s/\&colon\;/\:/gs;
351: # my $symb=&Apache::lonnet::encode_symb($uri,
352: # $token->[2]->{'id'},
353: # $turi);
354: # &Apache::lonnet::do_cache_new('title',$symb,$title);
355: unless ($ispage) {
356: $turi=~/\.(\w+)$/;
357: my $embstyle=&Apache::loncommon::fileembstyle($1);
358: if ($token->[2]->{'external'} eq 'true') { # external
1.130 raeburn 359: $turi=~s/^https?\:\/\//\/adm\/wrapper\/ext\//;
1.124 albertel 360: } elsif ($turi=~/^\/*uploaded\//) { # uploaded
361: if (($embstyle eq 'img')
362: || ($embstyle eq 'emb')
363: || ($embstyle eq 'wrp')) {
364: $turi='/adm/wrapper'.$turi;
365: } elsif ($embstyle eq 'ssi') {
366: #do nothing with these
367: } elsif ($turi!~/\.(sequence|page)$/) {
368: $turi='/adm/coursedocs/showdoc'.$turi;
369: }
370: } elsif ($turi=~/\S/) { # normal non-empty internal resource
371: my $mapdir=$uri;
372: $mapdir=~s/[^\/]+$//;
373: $turi=&Apache::lonnet::hreflocation($mapdir,$turi);
374: if (($embstyle eq 'img')
375: || ($embstyle eq 'emb')
376: || ($embstyle eq 'wrp')) {
377: $turi='/adm/wrapper'.$turi;
378: }
379: }
380: }
381: # Store reverse lookup, remove query string
382: my $idsuri=$turi;
383: $idsuri=~s/\?.+$//;
384: if (defined($hash{'ids_'.$idsuri})) {
385: $hash{'ids_'.$idsuri}.=','.$rid;
386: } else {
387: $hash{'ids_'.$idsuri}=''.$rid;
388: }
389:
1.135 raeburn 390: if ($turi=~/\/(syllabus|aboutme|navmaps|smppg|bulletinboard|viewclasslist)$/) {
1.124 albertel 391: $turi.='?register=1';
392: }
393:
394: $hash{'src_'.$rid}=$turi;
395:
396: if ($token->[2]->{'external'} eq 'true') {
397: $hash{'ext_'.$rid}='true:';
398: } else {
399: $hash{'ext_'.$rid}='false:';
400: }
401: if ($token->[2]->{'type'}) {
402: $hash{'type_'.$rid}=$token->[2]->{'type'};
403: if ($token->[2]->{'type'} eq 'start') {
404: $hash{'map_start_'.$uri}="$rid";
405: }
406: if ($token->[2]->{'type'} eq 'finish') {
407: $hash{'map_finish_'.$uri}="$rid";
408: }
409: } else {
410: $hash{'type_'.$rid}='normal';
411: }
412:
413: if (($turi=~/\.sequence$/) ||
414: ($turi=~/\.page$/)) {
415: $hash{'is_map_'.$rid}=1;
416: &loadmap($turi,$rid);
417: }
418: return $token->[2]->{'id'};
419: }
420:
421: sub make_link {
422: my ($linkpc,$lpc,$to,$from,$condition) = @_;
423:
424: my $linkid=$lpc.'.'.$linkpc;
425: my $goesto=$lpc.'.'.$to;
426: my $comesfrom=$lpc.'.'.$from;
427: my $undercond=0;
428:
429: if ($condition) {
430: $undercond=$lpc.'.'.$condition;
431: }
432:
433: $hash{'goesto_'.$linkid}=$goesto;
434: $hash{'comesfrom_'.$linkid}=$comesfrom;
435: $hash{'undercond_'.$linkid}=$undercond;
436:
437: if (defined($hash{'to_'.$comesfrom})) {
438: $hash{'to_'.$comesfrom}.=','.$linkid;
439: } else {
440: $hash{'to_'.$comesfrom}=''.$linkid;
441: }
442: if (defined($hash{'from_'.$goesto})) {
443: $hash{'from_'.$goesto}.=','.$linkid;
444: } else {
445: $hash{'from_'.$goesto}=''.$linkid;
446: }
447: }
448:
449: # ------------------------------------------------------------------- Condition
450: sub parse_condition {
451: my ($token,$lpc) = @_;
452: my $rid=$lpc.'.'.$token->[2]->{'id'};
453:
454: $hash{'kind_'.$rid}='cond';
455:
456: my $condition = $token->[2]->{'value'};
457: $condition =~ s/[\n\r]+/ /gs;
458: push(@cond, $condition);
459: $hash{'condid_'.$rid}=$#cond;
460: if ($token->[2]->{'type'}) {
461: $cond[$#cond].=':'.$token->[2]->{'type'};
462: } else {
463: $cond[$#cond].=':normal';
464: }
465: }
466:
467: # ------------------------------------------------------------------- Parameter
1.138 ! foxr 468: # Parse a <parameter> tag in the map.
! 469: # Parmameters:
! 470: # $token Token array for a start tag from HTML::TokeParser
! 471: # [0] = 'S'
! 472: # [1] = tagname ("param")
! 473: # [2] = Hash of {attribute} = values.
! 474: # [3] = Array of the keys in [2].
! 475: # [4] = unused.
! 476: # $lpc Current map nesting level.a
! 477: #
! 478: # Typical attributes:
! 479: # to=n - Number of the resource the parameter applies to.
! 480: # type=xx - Type of parameter value (e.g. string_yesno or int_pos).
! 481: # name=xxx - Name ofr parameter (e.g. parameter_randompick or parameter_randomorder).
! 482: # value=xxx - value of the parameter.
1.124 albertel 483:
484: sub parse_param {
485: my ($token,$lpc) = @_;
1.138 ! foxr 486: my $referid=$lpc.'.'.$token->[2]->{'to'}; # Resource param applies to.
! 487: my $name=$token->[2]->{'name'}; # Name of parameter
1.124 albertel 488: my $part;
1.138 ! foxr 489:
! 490:
! 491: if ($name=~/^parameter_(.*)_/) {
1.124 albertel 492: $part=$1;
493: } else {
494: $part=0;
495: }
1.138 ! foxr 496:
! 497: # Peel the parameter_ off the parameter name.
! 498:
1.124 albertel 499: $name=~s/^.*_([^_]*)$/$1/;
1.138 ! foxr 500:
! 501: # The value is:
! 502: # type.part.name.value
! 503:
1.124 albertel 504: my $newparam=
505: &escape($token->[2]->{'type'}).':'.
506: &escape($part.'.'.$name).'='.
507: &escape($token->[2]->{'value'});
1.138 ! foxr 508:
! 509: # The hash key is param_resourceid.
! 510: # Multiple parameters for a single resource are & separated in the hash.
! 511:
! 512:
1.124 albertel 513: if (defined($hash{'param_'.$referid})) {
514: $hash{'param_'.$referid}.='&'.$newparam;
515: } else {
516: $hash{'param_'.$referid}=''.$newparam;
517: }
1.138 ! foxr 518: #
! 519: # These parameters have to do with randomly selecting
! 520: # resources, therefore a separate hash is also created to
! 521: # make it easy to locate them when actually computing the resource set later on
! 522: # See the code conditionalized by ($randomize) in loadmap().
! 523:
! 524: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompick$/) { # Random selection turned on
1.124 albertel 525: $randompick{$referid}=$token->[2]->{'value'};
526: }
1.138 ! foxr 527: if ($token->[2]->{'name'}=~/^parameter_(0_)*randompickseed$/) { # Randomseed provided.
1.124 albertel 528: $randompickseed{$referid}=$token->[2]->{'value'};
529: }
1.138 ! foxr 530: if ($token->[2]->{'name'}=~/^parameter_(0_)*randomorder$/) { # Random order turned on.
1.124 albertel 531: $randomorder{$referid}=$token->[2]->{'value'};
532: }
1.138 ! foxr 533:
! 534: # These parameters have to do with how the URLs of resources are presented to
! 535: # course members(?). encrypturl presents encypted url's while
! 536: # hiddenresource hides the URL.
! 537: #
! 538:
1.124 albertel 539: if ($token->[2]->{'name'}=~/^parameter_(0_)*encrypturl$/) {
540: if ($token->[2]->{'value'}=~/^yes$/i) {
541: $encurl{$referid}=1;
542: }
543: }
544: if ($token->[2]->{'name'}=~/^parameter_(0_)*hiddenresource$/) {
545: if ($token->[2]->{'value'}=~/^yes$/i) {
546: $hiddenurl{$referid}=1;
547: }
548: }
549: }
550:
1.121 albertel 551: sub parse_mapalias_param {
552: my ($token,$lpc) = @_;
553: my $referid=$lpc.'.'.$token->[2]->{'to'};
554: return if (!exists($hash{'src_'.$referid}));
555:
556: if ($token->[2]->{'name'}=~/^parameter_(0_)*mapalias$/) {
1.122 albertel 557: &count_mapalias($token->[2]->{'value'},$referid);
1.121 albertel 558: $hash{'mapalias_'.$token->[2]->{'value'}}=$referid;
559: }
1.1 www 560: }
561:
1.3 www 562: # --------------------------------------------------------- Simplify expression
563:
564: sub simplify {
1.85 albertel 565: my $expression=shift;
1.101 albertel 566: # (0&1) = 1
1.105 albertel 567: $expression=~s/\(0\&([_\.\d]+)\)/$1/g;
1.3 www 568: # (8)=8
1.105 albertel 569: $expression=~s/\(([_\.\d]+)\)/$1/g;
1.3 www 570: # 8&8=8
1.105 albertel 571: $expression=~s/([^_\.\d])([_\.\d]+)\&\2([^_\.\d])/$1$2$3/g;
1.3 www 572: # 8|8=8
1.105 albertel 573: $expression=~s/([^_\.\d])([_\.\d]+)\|\2([^_\.\d])/$1$2$3/g;
1.3 www 574: # (5&3)&4=5&3&4
1.105 albertel 575: $expression=~s/\(([_\.\d]+)((?:\&[_\.\d]+)+)\)\&([_\.\d]+[^_\.\d])/$1$2\&$3/g;
1.3 www 576: # (((5&3)|(4&6)))=((5&3)|(4&6))
1.105 albertel 577: $expression=~
578: s/\((\(\([_\.\d]+(?:\&[_\.\d]+)*\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+\))\)/$1/g;
1.3 www 579: # ((5&3)|(4&6))|(1&2)=(5&3)|(4&6)|(1&2)
1.85 albertel 580: $expression=~
1.105 albertel 581: s/\((\([_\.\d]+(?:\&[_\.\d]+)*\))((?:\|\([_\.\d]+(?:\&[_\.\d]+)*\))+)\)\|(\([_\.\d]+(?:\&[_\.\d]+)*\))/\($1$2\|$3\)/g;
1.85 albertel 582: return $expression;
1.3 www 583: }
584:
1.2 www 585: # -------------------------------------------------------- Build condition hash
586:
587: sub traceroute {
1.77 www 588: my ($sofar,$rid,$beenhere,$encflag,$hdnflag)=@_;
1.81 albertel 589: my $newsofar=$sofar=simplify($sofar);
1.120 albertel 590: unless ($beenhere=~/\&\Q$rid\E\&/) {
1.85 albertel 591: $beenhere.=$rid.'&';
592: my ($mapid,$resid)=split(/\./,$rid);
593: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$rid});
594: my $hidden=&Apache::lonnet::EXT('resource.0.hiddenresource',$symb);
1.91 albertel 595:
1.90 albertel 596: if ($hdnflag || lc($hidden) eq 'yes') {
597: $hiddenurl{$rid}=1;
1.91 albertel 598: }
599: if (!$hdnflag && lc($hidden) eq 'no') {
1.90 albertel 600: delete($hiddenurl{$rid});
601: }
1.91 albertel 602:
1.85 albertel 603: my $encrypt=&Apache::lonnet::EXT('resource.0.encrypturl',$symb);
604: if ($encflag || lc($encrypt) eq 'yes') { $encurl{$rid}=1; }
1.116 www 605: if (($retfrid eq '') && ($hash{'src_'.$rid})
1.85 albertel 606: && ($hash{'src_'.$rid}!~/\.sequence$/)) {
1.116 www 607: $retfrid=$rid;
1.85 albertel 608: }
609: if (defined($hash{'conditions_'.$rid})) {
610: $hash{'conditions_'.$rid}=simplify(
1.103 albertel 611: '('.$hash{'conditions_'.$rid}.')|('.$sofar.')');
1.85 albertel 612: } else {
613: $hash{'conditions_'.$rid}=$sofar;
614: }
1.107 albertel 615:
616: # if the expression is just the 0th condition keep it
617: # otherwise leave a pointer to this condition expression
618: $newsofar = ($sofar eq '0') ? $sofar : '_'.$rid;
619:
1.85 albertel 620: if (defined($hash{'is_map_'.$rid})) {
621: if (defined($hash{'map_start_'.$hash{'src_'.$rid}})) {
622: $sofar=$newsofar=
623: &traceroute($sofar,
1.126 albertel 624: $hash{'map_start_'.$hash{'src_'.$rid}},
625: $beenhere,
1.85 albertel 626: $encflag || $encurl{$rid},
627: $hdnflag || $hiddenurl{$rid});
628: }
629: }
630: if (defined($hash{'to_'.$rid})) {
1.106 albertel 631: foreach my $id (split(/\,/,$hash{'to_'.$rid})) {
1.2 www 632: my $further=$sofar;
1.106 albertel 633: if ($hash{'undercond_'.$id}) {
634: if (defined($hash{'condid_'.$hash{'undercond_'.$id}})) {
1.105 albertel 635: $further=simplify('('.'_'.$rid.')&('.
1.106 albertel 636: $hash{'condid_'.$hash{'undercond_'.$id}}.')');
1.85 albertel 637: } else {
1.114 www 638: $errtext.=&mt('<br />Undefined condition ID: [_1]',$hash{'undercond_'.$id});
1.85 albertel 639: }
1.2 www 640: }
1.106 albertel 641: $newsofar=&traceroute($further,$hash{'goesto_'.$id},$beenhere,
1.81 albertel 642: $encflag,$hdnflag);
1.85 albertel 643: }
644: }
1.2 www 645: }
1.81 albertel 646: return $newsofar;
1.2 www 647: }
1.1 www 648:
1.19 www 649: # ------------------------------ Cascading conditions, quick access, parameters
1.4 www 650:
651: sub accinit {
652: my ($uri,$short,$fn)=@_;
653: my %acchash=();
654: my %captured=();
655: my $condcounter=0;
1.5 www 656: $acchash{'acc.cond.'.$short.'.0'}=0;
1.104 albertel 657: foreach my $key (keys(%hash)) {
658: if ($key=~/^conditions/) {
659: my $expr=$hash{$key};
1.109 albertel 660: # try to find and factor out common sub-expressions
1.105 albertel 661: foreach my $sub ($expr=~m/(\(\([_\.\d]+(?:\&[_\.\d]+)+\)(?:\|\([_\.\d]+(?:\&[_\.\d]+)+\))+\))/g) {
1.104 albertel 662: my $orig=$sub;
1.109 albertel 663:
664: my ($factor) = ($sub=~/\(\(([_\.\d]+\&(:?[_\.\d]+\&)*)(?:[_\.\d]+\&*)+\)(?:\|\(\1(?:[_\.\d]+\&*)+\))+\)/);
665: next if (!defined($factor));
666:
667: $sub=~s/\Q$factor\E//g;
1.85 albertel 668: $sub=~s/^\(/\($factor\(/;
669: $sub.=')';
670: $sub=simplify($sub);
1.109 albertel 671: $expr=~s/\Q$orig\E/$sub/;
1.85 albertel 672: }
1.104 albertel 673: $hash{$key}=$expr;
1.85 albertel 674: unless (defined($captured{$expr})) {
675: $condcounter++;
676: $captured{$expr}=$condcounter;
677: $acchash{'acc.cond.'.$short.'.'.$condcounter}=$expr;
678: }
1.104 albertel 679: } elsif ($key=~/^param_(\d+)\.(\d+)/) {
1.86 albertel 680: my $prefix=&Apache::lonnet::encode_symb($hash{'map_id_'.$1},$2,
681: $hash{'src_'.$1.'.'.$2});
1.104 albertel 682: foreach my $param (split(/\&/,$hash{$key})) {
683: my ($typename,$value)=split(/\=/,$param);
1.85 albertel 684: my ($type,$name)=split(/\:/,$typename);
1.114 www 685: $parmhash{$prefix.'.'.&unescape($name)}=
686: &unescape($value);
687: $parmhash{$prefix.'.'.&unescape($name).'.type'}=
688: &unescape($type);
1.85 albertel 689: }
690: }
1.26 harris41 691: }
1.104 albertel 692: foreach my $key (keys(%hash)) {
693: if ($key=~/^ids/) {
694: foreach my $resid (split(/\,/,$hash{$key})) {
1.85 albertel 695: my $uri=$hash{'src_'.$resid};
1.100 albertel 696: my ($uripath,$urifile) =
697: &Apache::lonnet::split_uri_for_cond($uri);
1.85 albertel 698: if ($uripath) {
699: my $uricond='0';
700: if (defined($hash{'conditions_'.$resid})) {
701: $uricond=$captured{$hash{'conditions_'.$resid}};
702: }
703: if (defined($acchash{'acc.res.'.$short.'.'.$uripath})) {
704: if ($acchash{'acc.res.'.$short.'.'.$uripath}=~
705: /(\&\Q$urifile\E\:[^\&]*)/) {
706: my $replace=$1;
707: my $regexp=$replace;
708: #$regexp=~s/\|/\\\|/g;
1.105 albertel 709: $acchash{'acc.res.'.$short.'.'.$uripath} =~
1.104 albertel 710: s/\Q$regexp\E/$replace\|$uricond/;
1.85 albertel 711: } else {
712: $acchash{'acc.res.'.$short.'.'.$uripath}.=
713: $urifile.':'.$uricond.'&';
714: }
715: } else {
716: $acchash{'acc.res.'.$short.'.'.$uripath}=
717: '&'.$urifile.':'.$uricond.'&';
718: }
719: }
720: }
721: }
1.26 harris41 722: }
1.24 www 723: $acchash{'acc.res.'.$short.'.'}='&:0&';
1.8 www 724: my $courseuri=$uri;
725: $courseuri=~s/^\/res\///;
1.131 raeburn 726: my $regexp = 1;
727: &Apache::lonnet::delenv('(acc\.|httpref\.)',$regexp);
1.128 raeburn 728: &Apache::lonnet::appenv(\%acchash);
1.4 www 729: }
730:
1.73 www 731: # ---------------- Selectively delete from randompick maps and hidden url parms
1.29 www 732:
1.73 www 733: sub hiddenurls {
1.31 www 734: my $randomoutentry='';
1.29 www 735: foreach my $rid (keys %randompick) {
736: my $rndpick=$randompick{$rid};
737: my $mpc=$hash{'map_pc_'.$hash{'src_'.$rid}};
738: # ------------------------------------------- put existing resources into array
739: my @currentrids=();
1.106 albertel 740: foreach my $key (sort(keys(%hash))) {
741: if ($key=~/^src_($mpc\.\d+)/) {
1.29 www 742: if ($hash{'src_'.$1}) { push @currentrids, $1; }
743: }
744: }
1.50 albertel 745: # rids are number.number and we want to numercially sort on
746: # the second number
747: @currentrids=sort {
748: my (undef,$aid)=split(/\./,$a);
749: my (undef,$bid)=split(/\./,$b);
750: $aid <=> $bid;
751: } @currentrids;
1.29 www 752: next if ($#currentrids<$rndpick);
753: # -------------------------------- randomly eliminate the ones that should stay
1.50 albertel 754: my (undef,$id)=split(/\./,$rid);
1.51 www 755: if ($randompickseed{$rid}) { $id=$randompickseed{$rid}; }
1.50 albertel 756: my $rndseed=&Apache::lonnet::rndseed($id); # use id instead of symb
1.58 albertel 757: &Apache::lonnet::setup_random_from_rndseed($rndseed);
1.50 albertel 758: my @whichids=&Math::Random::random_permuted_index($#currentrids+1);
759: for (my $i=1;$i<=$rndpick;$i++) { $currentrids[$whichids[$i]]=''; }
760: #&Apache::lonnet::logthis("$id,$rndseed,".join(':',@whichids));
1.29 www 761: # -------------------------------------------------------- delete the leftovers
762: for (my $k=0; $k<=$#currentrids; $k++) {
763: if ($currentrids[$k]) {
764: $hash{'randomout_'.$currentrids[$k]}=1;
1.32 www 765: my ($mapid,$resid)=split(/\./,$currentrids[$k]);
766: $randomoutentry.='&'.
1.86 albertel 767: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},
768: $resid,
769: $hash{'src_'.$currentrids[$k]}
770: ).'&';
1.29 www 771: }
772: }
1.31 www 773: }
1.73 www 774: # ------------------------------ take care of explicitly hidden urls or folders
775: foreach my $rid (keys %hiddenurl) {
776: $hash{'randomout_'.$rid}=1;
777: my ($mapid,$resid)=split(/\./,$rid);
778: $randomoutentry.='&'.
1.86 albertel 779: &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,
780: $hash{'src_'.$rid}).'&';
1.73 www 781: }
782: # --------------------------------------- append randomout entry to environment
1.31 www 783: if ($randomoutentry) {
1.128 raeburn 784: &Apache::lonnet::appenv({'acc.randomout' => $randomoutentry});
1.29 www 785: }
786: }
787:
1.1 www 788: # ---------------------------------------------------- Read map and all submaps
789:
790: sub readmap {
1.85 albertel 791: my $short=shift;
792: $short=~s/^\///;
1.138 ! foxr 793:
! 794: # TODO: Hidden dependency on current user:
! 795:
! 796: my %cenv=&Apache::lonnet::coursedescription($short,{'freshen_cache'=>1});
! 797:
1.85 albertel 798: my $fn=$cenv{'fn'};
799: my $uri;
800: $short=~s/\//\_/g;
801: unless ($uri=$cenv{'url'}) {
1.133 raeburn 802: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.85 albertel 803: "Could not load course $short.</font>");
1.114 www 804: return ('',&mt('No course data available.'));;
1.85 albertel 805: }
806: @cond=('true:normal');
1.96 albertel 807:
1.133 raeburn 808: unless (open(LOCKFILE,">$fn.db.lock")) {
1.138 ! foxr 809: #
! 810: # Most likely a permissions problem on the lockfile or its directory.
! 811: #
1.133 raeburn 812: $errtext.='<br />'.&mt('Map not loaded - Lock file could not be opened when reading map:').' <tt>'.$fn.'</tt>.';
813: $retfurl = '';
814: return ($retfurl,$errtext);
815: }
1.96 albertel 816: my $lock=0;
1.132 raeburn 817: my $gotstate=0;
1.138 ! foxr 818:
! 819: # If we can get the lock without delay any files there are idle
! 820: # and from some prior request. We'll kill them off and regenerate them:
! 821:
! 822: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
! 823: $lock=1; # Remember that we hold the lock.
1.132 raeburn 824: &unlink_tmpfiles($fn);
1.96 albertel 825: }
1.85 albertel 826: undef %randompick;
827: undef %hiddenurl;
828: undef %encurl;
1.116 www 829: $retfrid='';
1.138 ! foxr 830: my ($untiedhash,$untiedparmhash,$tiedhash,$tiedparmhash); # More state flags.
! 831:
! 832: # if we got the lock, regenerate course regnerate empty files and tie them.
! 833:
1.132 raeburn 834: if ($lock) {
835: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
836: $tiedhash = 1;
837: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
838: $tiedparmhash = 1;
1.138 ! foxr 839: $gotstate = &build_tmp_hashes($uri,
! 840: $fn,
! 841: $short,
! 842: \%cenv); # TODO: Need to provide requested user@dom
1.132 raeburn 843: unless ($gotstate) {
844: &Apache::lonnet::logthis('Failed to write statemap at first attempt '.$fn.' for '.$uri.'.</font>');
845: }
846: $untiedparmhash = untie(%parmhash);
847: unless ($untiedparmhash) {
848: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
849: 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
850: }
851: }
852: $untiedhash = untie(%hash);
853: unless ($untiedhash) {
854: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
855: 'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
856: }
857: }
1.138 ! foxr 858: flock(LOCKFILE,LOCK_UN); # RF: this is what I don't get unless there are other
! 859: # unlocked places the remainder happens..seems like if we
! 860: # just kept the lock here the rest of the code would have
! 861: # been much easier?
1.132 raeburn 862: }
863: unless ($lock && $tiedhash && $tiedparmhash) {
1.87 albertel 864: # if we are here it is likely because we are already trying to
865: # initialize the course in another child, busy wait trying to
866: # tie the hashes for the next 90 seconds, if we succeed forward
867: # them on to navmaps, if we fail, throw up the Could not init
868: # course screen
1.138 ! foxr 869: #
! 870: # RF: I'm not seeing the case where the ties/unties can fail in a way
! 871: # that can be remedied by this. Since we owned the lock seems
! 872: # Tie/untie failures are a result of something like a permissions problem instead?
! 873: #
! 874:
! 875: # In any vent, undo what we did manage to do above first:
1.96 albertel 876: if ($lock) {
877: # Got the lock but not the DB files
878: flock(LOCKFILE,LOCK_UN);
1.132 raeburn 879: $lock = 0;
1.96 albertel 880: }
1.132 raeburn 881: if ($tiedhash) {
882: unless($untiedhash) {
883: untie(%hash);
884: }
885: }
886: if ($tiedparmhash) {
887: unless($untiedparmhash) {
888: untie(%parmhash);
889: }
890: }
1.138 ! foxr 891: # Log our failure:
! 892:
1.133 raeburn 893: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.132 raeburn 894: "Could not tie coursemap $fn for $uri.</font>");
895: $tiedhash = '';
896: $tiedparmhash = '';
1.87 albertel 897: my $i=0;
1.138 ! foxr 898:
! 899: # Keep on retrying the lock for 90 sec until we succeed.
! 900:
1.87 albertel 901: while($i<90) {
902: $i++;
903: sleep(1);
1.132 raeburn 904: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
1.138 ! foxr 905:
! 906: # Got the lock, tie the hashes...the assumption in this code is
! 907: # that some other worker thread has created the db files quite recently
! 908: # so no load is needed:
! 909:
1.132 raeburn 910: $lock = 1;
911: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER(),0640)) {
912: $tiedhash = 1;
913: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_READER(),0640)) {
914: $tiedparmhash = 1;
915: if (-e "$fn.state") {
916: $retfurl='/adm/navmaps';
1.138 ! foxr 917:
! 918: # BUG BUG: Side effect!
! 919: # Should conditionalize on something so that we can use this
! 920: # to load maps for courses that are not current?
! 921: #
1.132 raeburn 922: &Apache::lonnet::appenv({"request.course.id" => $short,
923: "request.course.fn" => $fn,
924: "request.course.uri" => $uri});
925: $untiedhash = untie(%hash);
926: $untiedparmhash = untie(%parmhash);
927: $gotstate = 1;
928: last;
929: }
930: $untiedparmhash = untie(%parmhash);
931: }
932: $untiedhash = untie(%hash);
933: }
934: }
1.87 albertel 935: }
1.132 raeburn 936: if ($lock) {
937: flock(LOCKFILE,LOCK_UN);
1.133 raeburn 938: $lock = 0;
1.132 raeburn 939: if ($tiedparmhash) {
940: unless ($untiedparmhash) {
941: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
942: 'Could not untie coursemap parmhash '.$fn.' for '.$uri.'.</font>');
943: }
944: }
945: if ($tiedparmhash) {
946: unless ($untiedhash) {
947: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
948: 'Could not untie coursemap hash '.$fn.' for '.$uri.'.</font>');
949: }
950: }
951: }
952: }
1.138 ! foxr 953: # I think this branch of code is all about what happens if we just did the stuff above,
! 954: # but found that the state file did not exist...again if we'd just held the lock
! 955: # would that have made this logic simpler..as generating all the files would be
! 956: # an atomic operation with respect to the lock.
! 957: #
1.132 raeburn 958: unless ($gotstate) {
1.133 raeburn 959: $lock = 0;
1.132 raeburn 960: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
961: 'Could not read statemap '.$fn.' for '.$uri.'.</font>');
962: &unlink_tmpfiles($fn);
1.133 raeburn 963: if (flock(LOCKFILE,LOCK_EX|LOCK_NB)) {
964: $lock=1;
965: }
966: undef %randompick;
967: undef %hiddenurl;
968: undef %encurl;
969: $retfrid='';
1.138 ! foxr 970: #
! 971: # Once more through the routine of tying and loading and so on.
! 972: #
1.133 raeburn 973: if ($lock) {
974: if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_WRCREAT(),0640)) {
975: if (tie(%parmhash,'GDBM_File',$fn.'_parms.db',&GDBM_WRCREAT(),0640)) {
1.138 ! foxr 976: $gotstate = &build_tmp_hashes($uri,$fn,$short,\%cenv); # TODO: User dependent?
1.133 raeburn 977: unless ($gotstate) {
1.132 raeburn 978: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.133 raeburn 979: 'Failed to write statemap at second attempt '.$fn.' for '.$uri.'.</font>');
1.132 raeburn 980: }
1.133 raeburn 981: unless (untie(%parmhash)) {
1.132 raeburn 982: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1.133 raeburn 983: 'Could not untie coursemap parmhash '.$fn.'.db for '.$uri.'.</font>');
1.132 raeburn 984: }
1.133 raeburn 985: } else {
986: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
987: 'Could not tie coursemap '.$fn.'__parms.db for '.$uri.'.</font>');
988: }
989: unless (untie(%hash)) {
990: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
991: 'Could not untie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
992: }
1.132 raeburn 993: } else {
1.133 raeburn 994: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
995: 'Could not tie coursemap '.$fn.'.db for '.$uri.'.</font>');
1.132 raeburn 996: }
1.133 raeburn 997: flock(LOCKFILE,LOCK_UN);
998: $lock = 0;
999: } else {
1.138 ! foxr 1000: # Failed to get the immediate lock.
! 1001:
1.133 raeburn 1002: &Apache::lonnet::logthis('<font color="blue">WARNING: '.
1003: 'Could not obtain lock to tie coursemap hash '.$fn.'.db for '.$uri.'.</font>');
1.132 raeburn 1004: }
1005: }
1.133 raeburn 1006: close(LOCKFILE);
1.132 raeburn 1007: unless (($errtext eq '') || ($env{'request.course.uri'} =~ m{^/uploaded/})) {
1008: &Apache::lonmsg::author_res_msg($env{'request.course.uri'},
1.138 ! foxr 1009: $errtext); # TODO: User dependent?
1.1 www 1010: }
1.46 www 1011: # ------------------------------------------------- Check for critical messages
1012:
1.138 ! foxr 1013: # Depends on user must parameterize this as well..or separate as this is:
! 1014: # more part of determining what someone sees on entering a course?
! 1015:
1.89 albertel 1016: my @what=&Apache::lonnet::dump('critical',$env{'user.domain'},
1017: $env{'user.name'});
1.46 www 1018: if ($what[0]) {
1019: if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) {
1020: $retfurl='/adm/email?critical=display';
1021: }
1022: }
1.85 albertel 1023: return ($retfurl,$errtext);
1.1 www 1024: }
1.15 www 1025:
1.138 ! foxr 1026: #
! 1027: # This sub is called when the course hash and the param hash have been tied and
! 1028: # their lock file is held.
! 1029: # Parameters:
! 1030: # $uri - URI that identifies the course.
! 1031: # $fn - The base path/filename of the files that make up the context
! 1032: # being built.
! 1033: # $short - Short course name.
! 1034: # $cenvref - Reference to the course environment hash returned by
! 1035: # Apache::lonnet::coursedescription
! 1036: #
! 1037: # Assumptions:
! 1038: # The globals
! 1039: # %hash, %paramhash are tied to their gdbm files and we hold the lock on them.
! 1040: #
1.132 raeburn 1041: sub build_tmp_hashes {
1042: my ($uri,$fn,$short,$cenvref) = @_;
1.138 ! foxr 1043:
1.132 raeburn 1044: unless(ref($cenvref) eq 'HASH') {
1045: return;
1046: }
1047: my %cenv = %{$cenvref};
1048: my $gotstate = 0;
1.138 ! foxr 1049: %hash=(); # empty the global course and parameter hashes.
1.132 raeburn 1050: %parmhash=();
1.138 ! foxr 1051: $errtext=''; # No error messages yet.
1.132 raeburn 1052: $pc=0;
1053: &clear_mapalias_count();
1054: &processversionfile(%cenv);
1055: my $furi=&Apache::lonnet::clutter($uri);
1.138 ! foxr 1056: #
! 1057: # the map staring points.
! 1058: #
1.132 raeburn 1059: $hash{'src_0.0'}=&versiontrack($furi);
1060: $hash{'title_0.0'}=&Apache::lonnet::metadata($uri,'title');
1061: $hash{'ids_'.$furi}='0.0';
1062: $hash{'is_map_0.0'}=1;
1063: &loadmap($uri,'0.0');
1064: if (defined($hash{'map_start_'.$uri})) {
1065: &Apache::lonnet::appenv({"request.course.id" => $short,
1066: "request.course.fn" => $fn,
1067: "request.course.uri" => $uri});
1068: $env{'request.course.id'}=$short;
1069: &traceroute('0',$hash{'map_start_'.$uri},'&');
1070: &accinit($uri,$short,$fn);
1071: &hiddenurls();
1072: }
1073: $errtext .= &get_mapalias_errors();
1074: # ------------------------------------------------------- Put versions into src
1075: foreach my $key (keys(%hash)) {
1076: if ($key=~/^src_/) {
1077: $hash{$key}=&putinversion($hash{$key});
1078: } elsif ($key =~ /^(map_(?:start|finish|pc)_)(.*)/) {
1079: my ($type, $url) = ($1,$2);
1080: my $value = $hash{$key};
1081: $hash{$type.&putinversion($url)}=$value;
1082: }
1083: }
1084: # ---------------------------------------------------------------- Encrypt URLs
1085: foreach my $id (keys(%encurl)) {
1086: # $hash{'src_'.$id}=&Apache::lonenc::encrypted($hash{'src_'.$id});
1087: $hash{'encrypted_'.$id}=1;
1088: }
1089: # ----------------------------------------------- Close hashes to finally store
1090: # --------------------------------- Routine must pass this point, no early outs
1091: $hash{'first_rid'}=$retfrid;
1092: my ($mapid,$resid)=split(/\./,$retfrid);
1093: $hash{'first_mapurl'}=$hash{'map_id_'.$mapid};
1094: my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid},$resid,$hash{'src_'.$retfrid});
1095: $retfurl=&add_get_param($hash{'src_'.$retfrid},{ 'symb' => $symb });
1096: if ($hash{'encrypted_'.$retfrid}) {
1097: $retfurl=&Apache::lonenc::encrypted($retfurl,(&Apache::lonnet::allowed('adv') ne 'F'));
1098: }
1099: $hash{'first_url'}=$retfurl;
1100: # ---------------------------------------------------- Store away initial state
1101: {
1102: my $cfh;
1103: if (open($cfh,">$fn.state")) {
1104: print $cfh join("\n",@cond);
1105: $gotstate = 1;
1106: } else {
1107: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1108: "Could not write statemap $fn for $uri.</font>");
1109: }
1110: }
1111: return $gotstate;
1112: }
1113:
1114: sub unlink_tmpfiles {
1115: my ($fn) = @_;
1.138 ! foxr 1116: my $file_dir = dirname($fn);
! 1117:
! 1118: if ($fn eq LONCAPA::tempdir()) {
1.132 raeburn 1119: my @files = qw (.db _symb.db .state _parms.db);
1120: foreach my $file (@files) {
1121: if (-e $fn.$file) {
1122: unless (unlink($fn.$file)) {
1123: &Apache::lonnet::logthis("<font color=blue>WARNING: ".
1124: "Could not unlink ".$fn.$file."</font>");
1125: }
1126: }
1127: }
1128: }
1129: return;
1130: }
1131:
1.15 www 1132: # ------------------------------------------------------- Evaluate state string
1133:
1134: sub evalstate {
1.89 albertel 1135: my $fn=$env{'request.course.fn'}.'.state';
1.80 albertel 1136: my $state='';
1.15 www 1137: if (-e $fn) {
1.80 albertel 1138: my @conditions=();
1139: {
1.115 raeburn 1140: open(my $fh,"<$fn");
1.80 albertel 1141: @conditions=<$fh>;
1.115 raeburn 1142: close($fh);
1.80 albertel 1143: }
1144: my $safeeval = new Safe;
1145: my $safehole = new Safe::Hole;
1146: $safeeval->permit("entereval");
1147: $safeeval->permit(":base_math");
1148: $safeeval->deny(":base_io");
1149: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1150: foreach my $line (@conditions) {
1151: chomp($line);
1152: my ($condition,$weight)=split(/\:/,$line);
1153: if ($safeeval->reval($condition)) {
1154: if ($weight eq 'force') {
1155: $state.='3';
1156: } else {
1157: $state.='2';
1158: }
1159: } else {
1160: if ($weight eq 'stop') {
1161: $state.='0';
1162: } else {
1163: $state.='1';
1164: }
1165: }
1166: }
1.15 www 1167: }
1.128 raeburn 1168: &Apache::lonnet::appenv({'user.state.'.$env{'request.course.id'} => $state});
1.15 www 1169: return $state;
1170: }
1171:
1.138 ! foxr 1172: # This block seems to have code to manage/detect doubly defined
! 1173: # aliases in maps.
! 1174:
1.122 albertel 1175: {
1176: my %mapalias_cache;
1177: sub count_mapalias {
1178: my ($value,$resid) = @_;
1179: push(@{ $mapalias_cache{$value} }, $resid);
1180: }
1181:
1182: sub get_mapalias_errors {
1183: my $error_text;
1184: foreach my $mapalias (sort(keys(%mapalias_cache))) {
1185: next if (scalar(@{ $mapalias_cache{$mapalias} } ) == 1);
1186: my $count;
1187: my $which =
1188: join('</li><li>',
1189: map {
1190: my $id = $_;
1191: if (exists($hash{'src_'.$id})) {
1192: $count++;
1193: }
1194: my ($mapid) = split(/\./,$id);
1.125 albertel 1195: &mt('Resource "[_1]" <br /> in Map "[_2]"',
1196: $hash{'title_'.$id},
1.122 albertel 1197: $hash{'title_'.$hash{'ids_'.$hash{'map_id_'.$mapid}}});
1198: } (@{ $mapalias_cache{$mapalias} }));
1199: next if ($count < 2);
1200: $error_text .= '<div class="LC_error">'.
1201: &mt('Error: Found the mapalias "[_1]" defined multiple times.',
1202: $mapalias).
1203: '</div><ul><li>'.$which.'</li></ul>';
1204: }
1205: &clear_mapalias_count();
1206: return $error_text;
1207: }
1208: sub clear_mapalias_count {
1209: undef(%mapalias_cache);
1210: }
1211: }
1.1 www 1212: 1;
1213: __END__
1214:
1.26 harris41 1215: =head1 NAME
1216:
1217: Apache::lonuserstate - Construct and maintain state and binary representation
1218: of course for user
1219:
1220: =head1 SYNOPSIS
1221:
1222: Invoked by lonroles.pm.
1223:
1224: &Apache::lonuserstate::readmap($cdom.'/'.$cnum);
1225:
1226: =head1 INTRODUCTION
1227:
1228: This module constructs and maintains state and binary representation
1229: of course for user.
1230:
1231: This is part of the LearningOnline Network with CAPA project
1232: described at http://www.lon-capa.org.
1233:
1.129 jms 1234: =head1 SUBROUTINES
1.26 harris41 1235:
1.129 jms 1236: =over
1.26 harris41 1237:
1.129 jms 1238: =item loadmap()
1.26 harris41 1239:
1.129 jms 1240: Loads map from disk
1.26 harris41 1241:
1.129 jms 1242: =item simplify()
1.26 harris41 1243:
1.129 jms 1244: Simplify expression
1.26 harris41 1245:
1.129 jms 1246: =item traceroute()
1.26 harris41 1247:
1.129 jms 1248: Build condition hash
1.26 harris41 1249:
1.129 jms 1250: =item accinit()
1.26 harris41 1251:
1.129 jms 1252: Cascading conditions, quick access, parameters
1.26 harris41 1253:
1.129 jms 1254: =item readmap()
1.26 harris41 1255:
1.129 jms 1256: Read map and all submaps
1.1 www 1257:
1.129 jms 1258: =item evalstate()
1.1 www 1259:
1.129 jms 1260: Evaluate state string
1.1 www 1261:
1.26 harris41 1262: =back
1.1 www 1263:
1.26 harris41 1264: =cut
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