1: # The LearningOnline Network
2: # TCP networking package
3: #
4: # Functions for use by content handlers:
5: #
6: # plaintext(short) : plain text explanation of short term
7: # fileembstyle(ext) : embed style in page for file extension
8: # filedescription(ext) : descriptor text for file extension
9: # allowed(short,url) : returns codes for allowed actions
10: # F: full access
11: # U,I,K: authentication modes (cxx only)
12: # '': forbidden
13: # 1: user needs to choose course
14: # 2: browse allowed
15: # definerole(rolename,sys,dom,cou) : define a custom role rolename
16: # set priviledges in format of lonTabs/roles.tab for
17: # system, domain and course level,
18: # assignrole(udom,uname,url,role,end,start) : give a role to a user for the
19: # level given by url. Optional start and end dates
20: # (leave empty string or zero for "no date")
21: # assigncustomrole (udom,uname,url,rdom,rnam,rolename,end,start) : give a
22: # custom role to a user for the level given by url.
23: # Specify name and domain of role author, and role name
24: # revokerole (udom,uname,url,role) : Revoke a role for url
25: # revokecustomrole (udom,uname,url,rdom,rnam,rolename) : Revoke a custom role
26: # appenv(hash) : adds hash to session environment
27: # delenv(varname) : deletes all environment entries starting with varname
28: # store(hash) : stores hash permanently for this url
29: # cstore(hash) : critical store
30: # restore : returns hash for this url
31: # eget(namesp,array) : returns hash with keys from array filled in from namesp
32: # get(namesp,array) : returns hash with keys from array filled in from namesp
33: # del(namesp,array) : deletes keys out of array from namesp
34: # put(namesp,hash) : stores hash in namesp
35: # cput(namesp,hash) : critical put
36: # dump(namesp) : dumps the complete namespace into a hash
37: # ssi(url,hash) : does a complete request cycle on url to localhost, posts
38: # hash
39: # coursedescription(id) : returns and caches course description for id
40: # repcopy(filename) : replicate file
41: # dirlist(url) : gets a directory listing
42: # directcondval(index) : reading condition value of single condition from
43: # state string
44: # condval(index) : value of condition index based on state
45: # EXT(name) : value of a variable
46: # symblist(map,hash) : Updates symbolic storage links
47: # symbread([filename]) : returns the data handle (filename optional)
48: # rndseed() : returns a random seed
49: # getfile(filename) : returns the contents of filename, or a -1 if it can't
50: # be found, replicates and subscribes to the file
51: # filelocation(dir,file) : returns a farily clean absolute reference to file
52: # from the directory dir
53: # hreflocation(dir,file) : same as filelocation, but for hrefs
54: # log(domain,user,home,msg) : write to permanent log for user
55: #
56: # 6/1/99,6/2,6/10,6/11,6/12,6/14,6/26,6/28,6/29,6/30,
57: # 7/1,7/2,7/9,7/10,7/12,7/14,7/15,7/19,
58: # 11/8,11/16,11/18,11/22,11/23,12/22,
59: # 01/06,01/13,02/24,02/28,02/29,
60: # 03/01,03/02,03/06,03/07,03/13,
61: # 04/05,05/29,05/31,06/01,
62: # 06/05,06/26 Gerd Kortemeyer
63: # 06/26 Ben Tyszka
64: # 06/30,07/15,07/17,07/18,07/20,07/21,07/22,07/25 Gerd Kortemeyer
65: # 08/14 Ben Tyszka
66: # 08/22,08/28,08/31,09/01,09/02,09/04,09/05,09/25,09/28,09/30 Gerd Kortemeyer
67: # 10/04 Gerd Kortemeyer
68: # 10/04 Guy Albertelli
69: # 10/06,10/09,10/10,10/11,10/14,10/20,10/23,10/25,10/26,10/27,10/28,10/29,
70: # 10/30,10/31,11/2,11/14,11/15,11/16 Gerd Kortemeyer
71:
72: package Apache::lonnet;
73:
74: use strict;
75: use Apache::File;
76: use LWP::UserAgent();
77: use HTTP::Headers;
78: use vars
79: qw(%perlvar %hostname %homecache %spareid %hostdom %libserv %pr %prp %fe %fd $readit);
80: use IO::Socket;
81: use GDBM_File;
82: use Apache::Constants qw(:common :http);
83:
84: # --------------------------------------------------------------------- Logging
85:
86: sub logthis {
87: my $message=shift;
88: my $execdir=$perlvar{'lonDaemons'};
89: my $now=time;
90: my $local=localtime($now);
91: my $fh=Apache::File->new(">>$execdir/logs/lonnet.log");
92: print $fh "$local ($$): $message\n";
93: return 1;
94: }
95:
96: sub logperm {
97: my $message=shift;
98: my $execdir=$perlvar{'lonDaemons'};
99: my $now=time;
100: my $local=localtime($now);
101: my $fh=Apache::File->new(">>$execdir/logs/lonnet.perm.log");
102: print $fh "$now:$message:$local\n";
103: return 1;
104: }
105:
106: # -------------------------------------------------- Non-critical communication
107: sub subreply {
108: my ($cmd,$server)=@_;
109: my $peerfile="$perlvar{'lonSockDir'}/$server";
110: my $client=IO::Socket::UNIX->new(Peer =>"$peerfile",
111: Type => SOCK_STREAM,
112: Timeout => 10)
113: or return "con_lost";
114: print $client "$cmd\n";
115: my $answer=<$client>;
116: if (!$answer) { $answer="con_lost"; }
117: chomp($answer);
118: return $answer;
119: }
120:
121: sub reply {
122: my ($cmd,$server)=@_;
123: my $answer=subreply($cmd,$server);
124: if ($answer eq 'con_lost') { $answer=subreply($cmd,$server); }
125: if (($answer=~/^refused/) || ($answer=~/^rejected/)) {
126: &logthis("<font color=blue>WARNING:".
127: " $cmd to $server returned $answer</font>");
128: }
129: return $answer;
130: }
131:
132: # ----------------------------------------------------------- Send USR1 to lonc
133:
134: sub reconlonc {
135: my $peerfile=shift;
136: &logthis("Trying to reconnect for $peerfile");
137: my $loncfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
138: if (my $fh=Apache::File->new("$loncfile")) {
139: my $loncpid=<$fh>;
140: chomp($loncpid);
141: if (kill 0 => $loncpid) {
142: &logthis("lonc at pid $loncpid responding, sending USR1");
143: kill USR1 => $loncpid;
144: sleep 1;
145: if (-e "$peerfile") { return; }
146: &logthis("$peerfile still not there, give it another try");
147: sleep 5;
148: if (-e "$peerfile") { return; }
149: &logthis(
150: "<font color=blue>WARNING: $peerfile still not there, giving up</font>");
151: } else {
152: &logthis(
153: "<font color=blue>WARNING:".
154: " lonc at pid $loncpid not responding, giving up</font>");
155: }
156: } else {
157: &logthis('<font color=blue>WARNING: lonc not running, giving up</font>');
158: }
159: }
160:
161: # ------------------------------------------------------ Critical communication
162:
163: sub critical {
164: my ($cmd,$server)=@_;
165: my $answer=reply($cmd,$server);
166: if ($answer eq 'con_lost') {
167: my $pingreply=reply('ping',$server);
168: &reconlonc("$perlvar{'lonSockDir'}/$server");
169: my $pongreply=reply('pong',$server);
170: &logthis("Ping/Pong for $server: $pingreply/$pongreply");
171: $answer=reply($cmd,$server);
172: if ($answer eq 'con_lost') {
173: my $now=time;
174: my $middlename=$cmd;
175: $middlename=substr($middlename,0,16);
176: $middlename=~s/\W//g;
177: my $dfilename=
178: "$perlvar{'lonSockDir'}/delayed/$now.$middlename.$server";
179: {
180: my $dfh;
181: if ($dfh=Apache::File->new(">$dfilename")) {
182: print $dfh "$cmd\n";
183: }
184: }
185: sleep 2;
186: my $wcmd='';
187: {
188: my $dfh;
189: if ($dfh=Apache::File->new("$dfilename")) {
190: $wcmd=<$dfh>;
191: }
192: }
193: chomp($wcmd);
194: if ($wcmd eq $cmd) {
195: &logthis("<font color=blue>WARNING: ".
196: "Connection buffer $dfilename: $cmd</font>");
197: &logperm("D:$server:$cmd");
198: return 'con_delayed';
199: } else {
200: &logthis("<font color=red>CRITICAL:"
201: ." Critical connection failed: $server $cmd</font>");
202: &logperm("F:$server:$cmd");
203: return 'con_failed';
204: }
205: }
206: }
207: return $answer;
208: }
209:
210: # ---------------------------------------------------------- Append Environment
211:
212: sub appenv {
213: my %newenv=@_;
214: map {
215: if (($newenv{$_}=~/^user\.role/) || ($newenv{$_}=~/^user\.priv/)) {
216: &logthis("<font color=blue>WARNING: ".
217: "Attempt to modify environment ".$_." to ".$newenv{$_});
218: delete($newenv{$_});
219: } else {
220: $ENV{$_}=$newenv{$_};
221: }
222: } keys %newenv;
223: my @oldenv;
224: {
225: my $fh;
226: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
227: return 'error';
228: }
229: @oldenv=<$fh>;
230: }
231: for (my $i=0; $i<=$#oldenv; $i++) {
232: chomp($oldenv[$i]);
233: if ($oldenv[$i] ne '') {
234: my ($name,$value)=split(/=/,$oldenv[$i]);
235: unless (defined($newenv{$name})) {
236: $newenv{$name}=$value;
237: }
238: }
239: }
240: {
241: my $fh;
242: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
243: return 'error';
244: }
245: my $newname;
246: foreach $newname (keys %newenv) {
247: print $fh "$newname=$newenv{$newname}\n";
248: }
249: }
250: return 'ok';
251: }
252: # ----------------------------------------------------- Delete from Environment
253:
254: sub delenv {
255: my $delthis=shift;
256: my %newenv=();
257: if (($delthis=~/user\.role/) || ($delthis=~/user\.priv/)) {
258: &logthis("<font color=blue>WARNING: ".
259: "Attempt to delete from environment ".$delthis);
260: return 'error';
261: }
262: my @oldenv;
263: {
264: my $fh;
265: unless ($fh=Apache::File->new("$ENV{'user.environment'}")) {
266: return 'error';
267: }
268: @oldenv=<$fh>;
269: }
270: {
271: my $fh;
272: unless ($fh=Apache::File->new(">$ENV{'user.environment'}")) {
273: return 'error';
274: }
275: map {
276: unless ($_=~/^$delthis/) { print $fh $_; }
277: } @oldenv;
278: }
279: return 'ok';
280: }
281:
282: # ------------------------------ Find server with least workload from spare.tab
283:
284: sub spareserver {
285: my $tryserver;
286: my $spareserver='';
287: my $lowestserver=100;
288: foreach $tryserver (keys %spareid) {
289: my $answer=reply('load',$tryserver);
290: if (($answer =~ /\d/) && ($answer<$lowestserver)) {
291: $spareserver="http://$hostname{$tryserver}";
292: $lowestserver=$answer;
293: }
294: }
295: return $spareserver;
296: }
297:
298: # --------- Try to authenticate user from domain's lib servers (first this one)
299:
300: sub authenticate {
301: my ($uname,$upass,$udom)=@_;
302: $upass=escape($upass);
303: if (($perlvar{'lonRole'} eq 'library') &&
304: ($udom eq $perlvar{'lonDefDomain'})) {
305: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$perlvar{'lonHostID'});
306: if ($answer =~ /authorized/) {
307: if ($answer eq 'authorized') {
308: &logthis("User $uname at $udom authorized by local server");
309: return $perlvar{'lonHostID'};
310: }
311: if ($answer eq 'non_authorized') {
312: &logthis("User $uname at $udom rejected by local server");
313: return 'no_host';
314: }
315: }
316: }
317:
318: my $tryserver;
319: foreach $tryserver (keys %libserv) {
320: if ($hostdom{$tryserver} eq $udom) {
321: my $answer=reply("encrypt:auth:$udom:$uname:$upass",$tryserver);
322: if ($answer =~ /authorized/) {
323: if ($answer eq 'authorized') {
324: &logthis("User $uname at $udom authorized by $tryserver");
325: return $tryserver;
326: }
327: if ($answer eq 'non_authorized') {
328: &logthis("User $uname at $udom rejected by $tryserver");
329: return 'no_host';
330: }
331: }
332: }
333: }
334: &logthis("User $uname at $udom could not be authenticated");
335: return 'no_host';
336: }
337:
338: # ---------------------- Find the homebase for a user from domain's lib servers
339:
340: sub homeserver {
341: my ($uname,$udom)=@_;
342:
343: my $index="$uname:$udom";
344: if ($homecache{$index}) { return "$homecache{$index}"; }
345:
346: my $tryserver;
347: foreach $tryserver (keys %libserv) {
348: if ($hostdom{$tryserver} eq $udom) {
349: my $answer=reply("home:$udom:$uname",$tryserver);
350: if ($answer eq 'found') {
351: $homecache{$index}=$tryserver;
352: return $tryserver;
353: }
354: }
355: }
356: return 'no_host';
357: }
358:
359: # ----------------------------- Subscribe to a resource, return URL if possible
360:
361: sub subscribe {
362: my $fname=shift;
363: my $author=$fname;
364: $author=~s/\/home\/httpd\/html\/res\/([^\/]*)\/([^\/]*).*/$1\/$2/;
365: my ($udom,$uname)=split(/\//,$author);
366: my $home=homeserver($uname,$udom);
367: if (($home eq 'no_host') || ($home eq $perlvar{'lonHostID'})) {
368: return 'not_found';
369: }
370: my $answer=reply("sub:$fname",$home);
371: if (($answer eq 'con_lost') || ($answer eq 'rejected')) {
372: $answer.=' by '.$home;
373: }
374: return $answer;
375: }
376:
377: # -------------------------------------------------------------- Replicate file
378:
379: sub repcopy {
380: my $filename=shift;
381: $filename=~s/\/+/\//g;
382: my $transname="$filename.in.transfer";
383: if ((-e $filename) || (-e $transname)) { return OK; }
384: my $remoteurl=subscribe($filename);
385: if ($remoteurl =~ /^con_lost by/) {
386: &logthis("Subscribe returned $remoteurl: $filename");
387: return HTTP_SERVICE_UNAVAILABLE;
388: } elsif ($remoteurl eq 'not_found') {
389: &logthis("Subscribe returned not_found: $filename");
390: return HTTP_NOT_FOUND;
391: } elsif ($remoteurl =~ /^rejected by/) {
392: &logthis("Subscribe returned $remoteurl: $filename");
393: return FORBIDDEN;
394: } elsif ($remoteurl eq 'directory') {
395: return OK;
396: } else {
397: my @parts=split(/\//,$filename);
398: my $path="/$parts[1]/$parts[2]/$parts[3]/$parts[4]";
399: if ($path ne "$perlvar{'lonDocRoot'}/res") {
400: &logthis("Malconfiguration for replication: $filename");
401: return HTTP_BAD_REQUEST;
402: }
403: my $count;
404: for ($count=5;$count<$#parts;$count++) {
405: $path.="/$parts[$count]";
406: if ((-e $path)!=1) {
407: mkdir($path,0777);
408: }
409: }
410: my $ua=new LWP::UserAgent;
411: my $request=new HTTP::Request('GET',"$remoteurl");
412: my $response=$ua->request($request,$transname);
413: if ($response->is_error()) {
414: unlink($transname);
415: my $message=$response->status_line;
416: &logthis("<font color=blue>WARNING:"
417: ." LWP get: $message: $filename</font>");
418: return HTTP_SERVICE_UNAVAILABLE;
419: } else {
420: if ($remoteurl!~/\.meta$/) {
421: my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
422: my $mresponse=$ua->request($mrequest,$filename.'.meta');
423: if ($mresponse->is_error()) {
424: unlink($filename.'.meta');
425: &logthis(
426: "<font color=yellow>INFO: No metadata: $filename</font>");
427: }
428: }
429: rename($transname,$filename);
430: return OK;
431: }
432: }
433: }
434:
435: # --------------------------------------------------------- Server Side Include
436:
437: sub ssi {
438:
439: my ($fn,%form)=@_;
440:
441: my $ua=new LWP::UserAgent;
442:
443: my $request;
444:
445: if (%form) {
446: $request=new HTTP::Request('POST',"http://".$ENV{'HTTP_HOST'}.$fn);
447: $request->content(join '&', map { "$_=$form{$_}" } keys %form);
448: } else {
449: $request=new HTTP::Request('GET',"http://".$ENV{'HTTP_HOST'}.$fn);
450: }
451:
452: $request->header(Cookie => $ENV{'HTTP_COOKIE'});
453: my $response=$ua->request($request);
454:
455: return $response->content;
456: }
457:
458: # ------------------------------------------------------------------------- Log
459:
460: sub log {
461: my ($dom,$nam,$hom,$what)=@_;
462: return critical("log:$dom:$nam:$what",$hom);
463: }
464:
465: # ----------------------------------------------------------------------- Store
466:
467: sub store {
468: my %storehash=@_;
469: my $symb;
470: unless ($symb=escape(&symbread())) { return ''; }
471: my $namespace;
472: unless ($namespace=$ENV{'request.course.id'}) { return ''; }
473: my $namevalue='';
474: map {
475: $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
476: } keys %storehash;
477: $namevalue=~s/\&$//;
478: return reply(
479: "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
480: "$ENV{'user.home'}");
481: }
482:
483: # -------------------------------------------------------------- Critical Store
484:
485: sub cstore {
486: my %storehash=@_;
487: my $symb;
488: unless ($symb=escape(&symbread())) { return ''; }
489: my $namespace;
490: unless ($namespace=$ENV{'request.course.id'}) { return ''; }
491: my $namevalue='';
492: map {
493: $namevalue.=escape($_).'='.escape($storehash{$_}).'&';
494: } keys %storehash;
495: $namevalue=~s/\&$//;
496: return critical(
497: "store:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb:$namevalue",
498: "$ENV{'user.home'}");
499: }
500:
501: # --------------------------------------------------------------------- Restore
502:
503: sub restore {
504: my $symb;
505: unless ($symb=escape(&symbread())) { return ''; }
506: my $namespace;
507: unless ($namespace=$ENV{'request.course.id'}) { return ''; }
508: my $answer=reply(
509: "restore:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$symb",
510: "$ENV{'user.home'}");
511: my %returnhash=();
512: map {
513: my ($name,$value)=split(/\=/,$_);
514: $returnhash{&unescape($name)}=&unescape($value);
515: } split(/\&/,$answer);
516: map {
517: $returnhash{$_}=$returnhash{$returnhash{'version'}.':'.$_};
518: } split(/\:/,$returnhash{$returnhash{'version'}.':keys'});
519: return %returnhash;
520: }
521:
522: # ---------------------------------------------------------- Course Description
523:
524: sub coursedescription {
525: my $courseid=shift;
526: $courseid=~s/^\///;
527: $courseid=~s/\_/\//g;
528: my ($cdomain,$cnum)=split(/\//,$courseid);
529: my $chome=homeserver($cnum,$cdomain);
530: if ($chome ne 'no_host') {
531: my $rep=reply("dump:$cdomain:$cnum:environment",$chome);
532: if ($rep ne 'con_lost') {
533: my $normalid=$courseid;
534: $normalid=~s/\//\_/g;
535: my %envhash=();
536: my %returnhash=('home' => $chome,
537: 'domain' => $cdomain,
538: 'num' => $cnum);
539: map {
540: my ($name,$value)=split(/\=/,$_);
541: $name=&unescape($name);
542: $value=&unescape($value);
543: $returnhash{$name}=$value;
544: $envhash{'course.'.$normalid.'.'.$name}=$value;
545: } split(/\&/,$rep);
546: $returnhash{'url'}='/res/'.declutter($returnhash{'url'});
547: $returnhash{'fn'}=$perlvar{'lonDaemons'}.'/tmp/'.
548: $ENV{'user.name'}.'_'.$cdomain.'_'.$cnum;
549: $envhash{'course.'.$normalid.'.last_cache'}=time;
550: $envhash{'course.'.$normalid.'.home'}=$chome;
551: $envhash{'course.'.$normalid.'.domain'}=$cdomain;
552: $envhash{'course.'.$normalid.'.num'}=$cnum;
553: &appenv(%envhash);
554: return %returnhash;
555: }
556: }
557: return ();
558: }
559:
560: # -------------------------------------------------------- Get user priviledges
561:
562: sub rolesinit {
563: my ($domain,$username,$authhost)=@_;
564: my $rolesdump=reply("dump:$domain:$username:roles",$authhost);
565: if (($rolesdump eq 'con_lost') || ($rolesdump eq '')) { return ''; }
566: my %allroles=();
567: my %thesepriv=();
568: my $now=time;
569: my $userroles="user.login.time=$now\n";
570: my $thesestr;
571:
572: if ($rolesdump ne '') {
573: map {
574: if ($_!~/^rolesdef\&/) {
575: my ($area,$role)=split(/=/,$_);
576: $area=~s/\_\w\w$//;
577: my ($trole,$tend,$tstart)=split(/_/,$role);
578: $userroles.='user.role.'.$trole.'.'.$area.'='.
579: $tstart.'.'.$tend."\n";
580: if ($tend!=0) {
581: if ($tend<$now) {
582: $trole='';
583: }
584: }
585: if ($tstart!=0) {
586: if ($tstart>$now) {
587: $trole='';
588: }
589: }
590: if (($area ne '') && ($trole ne '')) {
591: my $spec=$trole.'.'.$area;
592: my ($tdummy,$tdomain,$trest)=split(/\//,$area);
593: if ($trole =~ /^cr\//) {
594: my ($rdummy,$rdomain,$rauthor,$rrole)=split(/\//,$trole);
595: my $homsvr=homeserver($rauthor,$rdomain);
596: if ($hostname{$homsvr} ne '') {
597: my $roledef=
598: reply("get:$rdomain:$rauthor:roles:rolesdef_$rrole",
599: $homsvr);
600: if (($roledef ne 'con_lost') && ($roledef ne '')) {
601: my ($syspriv,$dompriv,$coursepriv)=
602: split(/\_/,unescape($roledef));
603: $allroles{'cm./'}.=':'.$syspriv;
604: $allroles{$spec.'./'}.=':'.$syspriv;
605: if ($tdomain ne '') {
606: $allroles{'cm./'.$tdomain.'/'}.=':'.$dompriv;
607: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$dompriv;
608: if ($trest ne '') {
609: $allroles{'cm.'.$area}.=':'.$coursepriv;
610: $allroles{$spec.'.'.$area}.=':'.$coursepriv;
611: }
612: }
613: }
614: }
615: } else {
616: $allroles{'cm./'}.=':'.$pr{$trole.':s'};
617: $allroles{$spec.'./'}.=':'.$pr{$trole.':s'};
618: if ($tdomain ne '') {
619: $allroles{'cm./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
620: $allroles{$spec.'./'.$tdomain.'/'}.=':'.$pr{$trole.':d'};
621: if ($trest ne '') {
622: $allroles{'cm.'.$area}.=':'.$pr{$trole.':c'};
623: $allroles{$spec.'.'.$area}.=':'.$pr{$trole.':c'};
624: }
625: }
626: }
627: }
628: }
629: } split(/&/,$rolesdump);
630: map {
631: %thesepriv=();
632: map {
633: if ($_ ne '') {
634: my ($priviledge,$restrictions)=split(/&/,$_);
635: if ($restrictions eq '') {
636: $thesepriv{$priviledge}='F';
637: } else {
638: if ($thesepriv{$priviledge} ne 'F') {
639: $thesepriv{$priviledge}.=$restrictions;
640: }
641: }
642: }
643: } split(/:/,$allroles{$_});
644: $thesestr='';
645: map { $thesestr.=':'.$_.'&'.$thesepriv{$_}; } keys %thesepriv;
646: $userroles.='user.priv.'.$_.'='.$thesestr."\n";
647: } keys %allroles;
648: }
649: return $userroles;
650: }
651:
652: # --------------------------------------------------------------- get interface
653:
654: sub get {
655: my ($namespace,@storearr)=@_;
656: my $items='';
657: map {
658: $items.=escape($_).'&';
659: } @storearr;
660: $items=~s/\&$//;
661: my $rep=reply("get:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
662: $ENV{'user.home'});
663: my @pairs=split(/\&/,$rep);
664: my %returnhash=();
665: my $i=0;
666: map {
667: $returnhash{$_}=unescape($pairs[$i]);
668: $i++;
669: } @storearr;
670: return %returnhash;
671: }
672:
673: # --------------------------------------------------------------- del interface
674:
675: sub del {
676: my ($namespace,@storearr)=@_;
677: my $items='';
678: map {
679: $items.=escape($_).'&';
680: } @storearr;
681: $items=~s/\&$//;
682: return reply("del:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
683: $ENV{'user.home'});
684: }
685:
686: # -------------------------------------------------------------- dump interface
687:
688: sub dump {
689: my $namespace=shift;
690: my $rep=reply("dump:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace",
691: $ENV{'user.home'});
692: my @pairs=split(/\&/,$rep);
693: my %returnhash=();
694: map {
695: my ($key,$value)=split(/=/,$_);
696: $returnhash{unescape($key)}=unescape($value);
697: } @pairs;
698: return %returnhash;
699: }
700:
701: # --------------------------------------------------------------- put interface
702:
703: sub put {
704: my ($namespace,%storehash)=@_;
705: my $items='';
706: map {
707: $items.=escape($_).'='.escape($storehash{$_}).'&';
708: } keys %storehash;
709: $items=~s/\&$//;
710: return reply("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
711: $ENV{'user.home'});
712: }
713:
714: # ------------------------------------------------------ critical put interface
715:
716: sub cput {
717: my ($namespace,%storehash)=@_;
718: my $items='';
719: map {
720: $items.=escape($_).'='.escape($storehash{$_}).'&';
721: } keys %storehash;
722: $items=~s/\&$//;
723: return critical
724: ("put:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
725: $ENV{'user.home'});
726: }
727:
728: # -------------------------------------------------------------- eget interface
729:
730: sub eget {
731: my ($namespace,@storearr)=@_;
732: my $items='';
733: map {
734: $items.=escape($_).'&';
735: } @storearr;
736: $items=~s/\&$//;
737: my $rep=reply("eget:$ENV{'user.domain'}:$ENV{'user.name'}:$namespace:$items",
738: $ENV{'user.home'});
739: my @pairs=split(/\&/,$rep);
740: my %returnhash=();
741: my $i=0;
742: map {
743: $returnhash{$_}=unescape($pairs[$i]);
744: $i++;
745: } @storearr;
746: return %returnhash;
747: }
748:
749: # ------------------------------------------------- Check for a user priviledge
750:
751: sub allowed {
752: my ($priv,$uri)=@_;
753: $uri=&declutter($uri);
754:
755: # Free bre access to adm and meta resources
756:
757: if ((($uri=~/^adm\//) || ($uri=~/\.meta$/)) && ($priv eq 'bre')) {
758: return 'F';
759: }
760:
761: my $thisallowed='';
762: my $statecond=0;
763: my $courseprivid='';
764:
765: # Course
766:
767: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'}=~/$priv\&([^\:]*)/) {
768: $thisallowed.=$1;
769: }
770:
771: # Domain
772:
773: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.(split(/\//,$uri))[0].'/'}
774: =~/$priv\&([^\:]*)/) {
775: $thisallowed.=$1;
776: }
777:
778: # Course: uri itself is a course
779:
780: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$uri}
781: =~/$priv\&([^\:]*)/) {
782: $thisallowed.=$1;
783: }
784:
785: # Full access at system, domain or course-wide level? Exit.
786:
787: if ($thisallowed=~/F/) {
788: return 'F';
789: }
790:
791: # If this is generating or modifying users, exit with special codes
792:
793: if (':csu:cdc:ccc:cin:cta:cep:ccr:cst:cad:cli:cau:cdg:'=~/\:$priv\:/) {
794: return $thisallowed;
795: }
796: #
797: # Gathered so far: system, domain and course wide priviledges
798: #
799: # Course: See if uri or referer is an individual resource that is part of
800: # the course
801:
802: if ($ENV{'request.course.id'}) {
803: $courseprivid=$ENV{'request.course.id'};
804: if ($ENV{'request.course.sec'}) {
805: $courseprivid.='/'.$ENV{'request.course.sec'};
806: }
807: $courseprivid=~s/\_/\//;
808: my $checkreferer=1;
809: my @uriparts=split(/\//,$uri);
810: my $filename=$uriparts[$#uriparts];
811: my $pathname=$uri;
812: $pathname=~s/\/$filename$//;
813: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
814: /\&$filename\:([\d\|]+)\&/) {
815: $statecond=$1;
816: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
817: =~/$priv\&([^\:]*)/) {
818: $thisallowed.=$1;
819: $checkreferer=0;
820: }
821: }
822:
823: if (($ENV{'HTTP_REFERER'}) && ($checkreferer)) {
824: my $refuri=$ENV{'HTTP_REFERER'};
825: $refuri=~s/^http\:\/\/$ENV{'request.host'}//i;
826: $refuri=&declutter($refuri);
827: my @uriparts=split(/\//,$refuri);
828: my $filename=$uriparts[$#uriparts];
829: my $pathname=$refuri;
830: $pathname=~s/\/$filename$//;
831: my @filenameparts=split(/\./,$uri);
832: if (&fileembstyle($filenameparts[$#filenameparts]) ne 'ssi') {
833: if ($ENV{'acc.res.'.$ENV{'request.course.id'}.'.'.$pathname}=~
834: /\&$filename\:([\d\|]+)\&/) {
835: my $refstatecond=$1;
836: if ($ENV{'user.priv.'.$ENV{'request.role'}.'./'.$courseprivid}
837: =~/$priv\&([^\:]*)/) {
838: $thisallowed.=$1;
839: $uri=$refuri;
840: $statecond=$refstatecond;
841: }
842: }
843: }
844: }
845: }
846:
847: #
848: # Gathered now: all priviledges that could apply, and condition number
849: #
850: #
851: # Full or no access?
852: #
853:
854: if ($thisallowed=~/F/) {
855: return 'F';
856: }
857:
858: unless ($thisallowed) {
859: return '';
860: }
861:
862: # Restrictions exist, deal with them
863: #
864: # C:according to course preferences
865: # R:according to resource settings
866: # L:unless locked
867: # X:according to user session state
868: #
869:
870: # Possibly locked functionality, check all courses
871: # Locks might take effect only after 10 minutes cache expiration for other
872: # courses, and 2 minutes for current course
873:
874: my $envkey;
875: if ($thisallowed=~/L/) {
876: foreach $envkey (keys %ENV) {
877: if ($envkey=~/^user\.role\.(st|ta)\.([^\.]*)/) {
878: my $courseid=$2;
879: my $roleid=$1.'.'.$2;
880: my $expiretime=600;
881: if ($ENV{'request.role'} eq $roleid) {
882: $expiretime=120;
883: }
884: my ($cdom,$cnum,$csec)=split(/\//,$courseid);
885: my $prefix='course.'.$cdom.'_'.$cnum.'.';
886: if ((time-$ENV{$prefix.'last_cache'})>$expiretime) {
887: &coursedescription($courseid);
888: }
889: if (($ENV{$prefix.'res.'.$uri.'.lock.sections'}=~/\,$csec\,/)
890: || ($ENV{$prefix.'res.'.$uri.'.lock.sections'} eq 'all')) {
891: if ($ENV{$prefix.'res.'.$uri.'.lock.expire'}>time) {
892: &log($ENV{'user.domain'},$ENV{'user.name'},
893: $ENV{'user.host'},
894: 'Locked by res: '.$priv.' for '.$uri.' due to '.
895: $cdom.'/'.$cnum.'/'.$csec.' expire '.
896: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
897: return '';
898: }
899: }
900: if (($ENV{$prefix.'priv.'.$priv.'.lock.sections'}=~/\,$csec\,/)
901: || ($ENV{$prefix.'priv.'.$priv.'.lock.sections'} eq 'all')) {
902: if ($ENV{'priv.'.$priv.'.lock.expire'}>time) {
903: &log($ENV{'user.domain'},$ENV{'user.name'},
904: $ENV{'user.host'},
905: 'Locked by priv: '.$priv.' for '.$uri.' due to '.
906: $cdom.'/'.$cnum.'/'.$csec.' expire '.
907: $ENV{$prefix.'priv.'.$priv.'.lock.expire'});
908: return '';
909: }
910: }
911: }
912: }
913: }
914:
915: #
916: # Rest of the restrictions depend on selected course
917: #
918:
919: unless ($ENV{'request.course.id'}) {
920: return '1';
921: }
922:
923: #
924: # Now user is definitely in a course
925: #
926:
927:
928: # Course preferences
929:
930: if ($thisallowed=~/C/) {
931: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
932: if ($ENV{'course.'.$ENV{'request.course.id'}.'.'.$priv.'.roles.denied'}
933: =~/\,$rolecode\,/) {
934: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
935: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode.' in '.
936: $ENV{'request.course.id'});
937: return '';
938: }
939: }
940:
941: # Resource preferences
942:
943: if ($thisallowed=~/R/) {
944: my $rolecode=(split(/\./,$ENV{'request.role'}))[0];
945: my $filename=$perlvar{'lonDocRoot'}.'/res/'.$uri.'.meta';
946: if (-e $filename) {
947: my @content;
948: {
949: my $fh=Apache::File->new($filename);
950: @content=<$fh>;
951: }
952: if (join('',@content)=~
953: /\<roledeny[^\>]*\>[^\<]*$rolecode[^\<]*\<\/roledeny\>/) {
954: &log($ENV{'user.domain'},$ENV{'user.name'},$ENV{'user.host'},
955: 'Denied by role: '.$priv.' for '.$uri.' as '.$rolecode);
956: return '';
957:
958: }
959: }
960: }
961:
962: # Restricted by state?
963:
964: if ($thisallowed=~/X/) {
965: if (&condval($statecond)) {
966: return '2';
967: } else {
968: return '';
969: }
970: }
971:
972: return 'F';
973: }
974:
975: # ----------------------------------------------------------------- Define Role
976:
977: sub definerole {
978: if (allowed('mcr','/')) {
979: my ($rolename,$sysrole,$domrole,$courole)=@_;
980: map {
981: my ($crole,$cqual)=split(/\&/,$_);
982: if ($pr{'cr:s'}!~/$crole/) { return "refused:s:$crole"; }
983: if ($pr{'cr:s'}=~/$crole\&/) {
984: if ($pr{'cr:s'}!~/$crole\&\w*$cqual/) {
985: return "refused:s:$crole&$cqual";
986: }
987: }
988: } split('/',$sysrole);
989: map {
990: my ($crole,$cqual)=split(/\&/,$_);
991: if ($pr{'cr:d'}!~/$crole/) { return "refused:d:$crole"; }
992: if ($pr{'cr:d'}=~/$crole\&/) {
993: if ($pr{'cr:d'}!~/$crole\&\w*$cqual/) {
994: return "refused:d:$crole&$cqual";
995: }
996: }
997: } split('/',$domrole);
998: map {
999: my ($crole,$cqual)=split(/\&/,$_);
1000: if ($pr{'cr:c'}!~/$crole/) { return "refused:c:$crole"; }
1001: if ($pr{'cr:c'}=~/$crole\&/) {
1002: if ($pr{'cr:c'}!~/$crole\&\w*$cqual/) {
1003: return "refused:c:$crole&$cqual";
1004: }
1005: }
1006: } split('/',$courole);
1007: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1008: "$ENV{'user.domain'}:$ENV{'user.name'}:".
1009: "rolesdef_$rolename=".
1010: escape($sysrole.'_'.$domrole.'_'.$courole);
1011: return reply($command,$ENV{'user.home'});
1012: } else {
1013: return 'refused';
1014: }
1015: }
1016:
1017: # ------------------------------------------------------------------ Plain Text
1018:
1019: sub plaintext {
1020: my $short=shift;
1021: return $prp{$short};
1022: }
1023:
1024: # ------------------------------------------------------------------ Plain Text
1025:
1026: sub fileembstyle {
1027: my $ending=shift;
1028: return $fe{$ending};
1029: }
1030:
1031: # ------------------------------------------------------------ Description Text
1032:
1033: sub filedecription {
1034: my $ending=shift;
1035: return $fd{$ending};
1036: }
1037:
1038: # ----------------------------------------------------------------- Assign Role
1039:
1040: sub assignrole {
1041: my ($udom,$uname,$url,$role,$end,$start)=@_;
1042: my $mrole;
1043: $url=declutter($url);
1044: if ($role =~ /^cr\//) {
1045: unless ($url=~/\.course$/) { return 'invalid'; }
1046: unless (allowed('ccr',$url)) { return 'refused'; }
1047: $mrole='cr';
1048: } else {
1049: unless (($url=~/\.course$/) || ($url=~/\/$/)) { return 'invalid'; }
1050: unless (allowed('c'+$role)) { return 'refused'; }
1051: $mrole=$role;
1052: }
1053: my $command="encrypt:rolesput:$ENV{'user.domain'}:$ENV{'user.name'}:".
1054: "$udom:$uname:$url".'_'."$mrole=$role";
1055: if ($end) { $command.='_$end'; }
1056: if ($start) {
1057: if ($end) {
1058: $command.='_$start';
1059: } else {
1060: $command.='_0_$start';
1061: }
1062: }
1063: return &reply($command,&homeserver($uname,$udom));
1064: }
1065:
1066: # ---------------------------------------------------------- Assign Custom Role
1067:
1068: sub assigncustomrole {
1069: my ($udom,$uname,$url,$rdom,$rnam,$rolename,$end,$start)=@_;
1070: return &assignrole($udom,$uname,$url,'cr/'.$rdom.'/'.$rnam.'/'.$rolename,
1071: $end,$start);
1072: }
1073:
1074: # ----------------------------------------------------------------- Revoke Role
1075:
1076: sub revokerole {
1077: my ($udom,$uname,$url,$role)=@_;
1078: my $now=time;
1079: return &assignrole($udom,$uname,$url,$role,$now);
1080: }
1081:
1082: # ---------------------------------------------------------- Revoke Custom Role
1083:
1084: sub revokecustomrole {
1085: my ($udom,$uname,$url,$rdom,$rnam,$rolename)=@_;
1086: my $now=time;
1087: return &assigncustomrole($udom,$uname,$url,$rdom,$rnam,$rolename,$now);
1088: }
1089:
1090: # ------------------------------------------------------------ Directory lister
1091:
1092: sub dirlist {
1093: my $uri=shift;
1094: $uri=~s/^\///;
1095: $uri=~s/\/$//;
1096: my ($res,$udom,$uname,@rest)=split(/\//,$uri);
1097: if ($udom) {
1098: if ($uname) {
1099: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/'.$uri,
1100: homeserver($uname,$udom));
1101: return split(/:/,$listing);
1102: } else {
1103: my $tryserver;
1104: my %allusers=();
1105: foreach $tryserver (keys %libserv) {
1106: if ($hostdom{$tryserver} eq $udom) {
1107: my $listing=reply('ls:'.$perlvar{'lonDocRoot'}.'/res/'.$udom,
1108: $tryserver);
1109: if (($listing ne 'no_such_dir') && ($listing ne 'empty')
1110: && ($listing ne 'con_lost')) {
1111: map {
1112: my ($entry,@stat)=split(/&/,$_);
1113: $allusers{$entry}=1;
1114: } split(/:/,$listing);
1115: }
1116: }
1117: }
1118: my $alluserstr='';
1119: map {
1120: $alluserstr.=$_.'&user:';
1121: } sort keys %allusers;
1122: $alluserstr=~s/:$//;
1123: return split(/:/,$alluserstr);
1124: }
1125: } else {
1126: my $tryserver;
1127: my %alldom=();
1128: foreach $tryserver (keys %libserv) {
1129: $alldom{$hostdom{$tryserver}}=1;
1130: }
1131: my $alldomstr='';
1132: map {
1133: $alldomstr.=$perlvar{'lonDocRoot'}.'/res/'.$_.'&domain:';
1134: } sort keys %alldom;
1135: $alldomstr=~s/:$//;
1136: return split(/:/,$alldomstr);
1137: }
1138: }
1139:
1140: # -------------------------------------------------------- Value of a Condition
1141:
1142: sub directcondval {
1143: my $number=shift;
1144: if ($ENV{'user.state.'.$ENV{'request.course.id'}}) {
1145: return substr($ENV{'user.state.'.$ENV{'request.course.id'}},$number,1);
1146: } else {
1147: return 2;
1148: }
1149: }
1150:
1151: sub condval {
1152: my $condidx=shift;
1153: my $result=0;
1154: my $allpathcond='';
1155: map {
1156: if (defined($ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_})) {
1157: $allpathcond.=
1158: '('.$ENV{'acc.cond.'.$ENV{'request.course.id'}.'.'.$_}.')|';
1159: }
1160: } split(/\|/,$condidx);
1161: $allpathcond=~s/\|$//;
1162: if ($ENV{'request.course.id'}) {
1163: if ($allpathcond) {
1164: my $operand='|';
1165: my @stack;
1166: map {
1167: if ($_ eq '(') {
1168: push @stack,($operand,$result)
1169: } elsif ($_ eq ')') {
1170: my $before=pop @stack;
1171: if (pop @stack eq '&') {
1172: $result=$result>$before?$before:$result;
1173: } else {
1174: $result=$result>$before?$result:$before;
1175: }
1176: } elsif (($_ eq '&') || ($_ eq '|')) {
1177: $operand=$_;
1178: } else {
1179: my $new=directcondval($_);
1180: if ($operand eq '&') {
1181: $result=$result>$new?$new:$result;
1182: } else {
1183: $result=$result>$new?$result:$new;
1184: }
1185: }
1186: } ($allpathcond=~/(\d+|\(|\)|\&|\|)/g);
1187: }
1188: }
1189: return $result;
1190: }
1191:
1192: # --------------------------------------------------------- Value of a Variable
1193:
1194: sub EXT {
1195: my $varname=shift;
1196: my ($realm,$space,$qualifier,@therest)=split(/\./,$varname);
1197: my $rest;
1198: if ($therest[0]) {
1199: $rest=join('.',@therest);
1200: } else {
1201: $rest='';
1202: }
1203: my $qualifierrest=$qualifier;
1204: if ($rest) { $qualifierrest.='.'.$rest; }
1205: my $spacequalifierrest=$space;
1206: if ($qualifierrest) { $spacequalifierrest.='.'.$qualifierrest; }
1207: if ($realm eq 'user') {
1208: # --------------------------------------------------------------- user.resource
1209: if ($space eq 'resource') {
1210: my %restored=&restore;
1211: return $restored{$qualifierrest};
1212: # ----------------------------------------------------------------- user.access
1213: } elsif ($space eq 'access') {
1214: return &allowed($qualifier,$rest);
1215: # ------------------------------------------ user.preferences, user.environment
1216: } elsif (($space eq 'preferences') || ($space eq 'environment')) {
1217: return $ENV{join('.',('environment',$qualifierrest))};
1218: # ----------------------------------------------------------------- user.course
1219: } elsif ($space eq 'course') {
1220: return $ENV{join('.',('request.course',$qualifier))};
1221: # ------------------------------------------------------------------- user.role
1222: } elsif ($space eq 'role') {
1223: my ($role,$where)=split(/\./,$ENV{'request.role'});
1224: if ($qualifier eq 'value') {
1225: return $role;
1226: } elsif ($qualifier eq 'extent') {
1227: return $where;
1228: }
1229: # ----------------------------------------------------------------- user.domain
1230: } elsif ($space eq 'domain') {
1231: return $ENV{'user.domain'};
1232: # ------------------------------------------------------------------- user.name
1233: } elsif ($space eq 'name') {
1234: return $ENV{'user.name'};
1235: # ---------------------------------------------------- Any other user namespace
1236: } else {
1237: my $item=($rest)?$qualifier.'.'.$rest:$qualifier;
1238: my %reply=&get($space,$item);
1239: return $reply{$item};
1240: }
1241: } elsif ($realm eq 'request') {
1242: # ------------------------------------------------------------- request.browser
1243: if ($space eq 'browser') {
1244: return $ENV{'browser.'.$qualifier};
1245: # ------------------------------------------------------------ request.filename
1246: } else {
1247: return $ENV{'request.'.$spacequalifierrest};
1248: }
1249: } elsif ($realm eq 'course') {
1250: # ---------------------------------------------------------- course.description
1251: my $section='';
1252: if ($ENV{'request.course.sec'}) {
1253: $section='_'.$ENV{'request.course.sec'};
1254: }
1255: return $ENV{'course.'.$ENV{'request.course.id'}.$section.'.'.
1256: $spacequalifierrest};
1257: } elsif ($realm eq 'resource') {
1258: if ($ENV{'request.course.id'}) {
1259: # ----------------------------------------------------- Cascading lookup scheme
1260: my $symbparm=&symbread().'.'.$spacequalifierrest;
1261: my $reslevel=
1262: $ENV{'request.course.id'}.'.'.$symbparm;
1263: my $seclevel=
1264: $ENV{'request.course.id'}.'.'.
1265: $ENV{'request.course.sec'}.'.'.$spacequalifierrest;
1266: my $courselevel=
1267: $ENV{'request.course.id'}.'.'.$spacequalifierrest;
1268:
1269: # ----------------------------------------------------------- first, check user
1270: my %resourcedata=get('resourcedata',($reslevel,$seclevel,$courselevel));
1271: if ($resourcedata{$reslevel}!~/^error\:/) {
1272: if ($resourcedata{$reslevel}) { return $resourcedata{$reslevel}; }
1273: if ($resourcedata{$seclevel}) { return $resourcedata{$seclevel}; }
1274: if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
1275: }
1276: # -------------------------------------------------------- second, check course
1277: my $section='';
1278: if ($ENV{'request.course.sec'}) {
1279: $section='_'.$ENV{'request.course.sec'};
1280: }
1281: my $reply=&reply('get:'.
1282: $ENV{'course.'.$ENV{'request.course.id'}.$section.'.domain'}.':'.
1283: $ENV{'course.'.$ENV{'request.course.id'}.$section.'.num'}.
1284: ':resourcedata:'.
1285: escape($reslevel).':'.escape($seclevel).':'.escape($courselevel),
1286: $ENV{'course.'.$ENV{'request.course.id'}.$section.'.home'});
1287: if ($reply!~/^error\:/) {
1288: map {
1289: my ($name,$value)=split(/\=/,$_);
1290: $resourcedata{unescape($name)}=unescape($value);
1291: } split(/\&/,$reply);
1292: if ($resourcedata{$reslevel}) { return $resourcedata{$reslevel}; }
1293: if ($resourcedata{$seclevel}) { return $resourcedata{$seclevel}; }
1294: if ($resourcedata{$courselevel}) { return $resourcedata{$courselevel}; }
1295: }
1296:
1297: # ------------------------------------------------------ third, check map parms
1298: my %parmhash=();
1299: my $thisparm='';
1300: if (tie(%parmhash,'GDBM_File',
1301: $ENV{'request.course.fn'}.'_parms.db',&GDBM_READER,0640)) {
1302: $thisparm=$parmhash{$symbparm};
1303: untie(%parmhash);
1304: }
1305: if ($thisparm) { return $thisparm; }
1306: }
1307:
1308: # --------------------------------------------- last, look in resource metadata
1309: my $uri=&declutter($ENV{'request.filename'});
1310: my $filename=$perlvar{'lonDocRoot'}.'/res/'.$ENV.'.meta';
1311: if (-e $filename) {
1312: my @content;
1313: {
1314: my $fh=Apache::File->new($filename);
1315: @content=<$fh>;
1316: }
1317: if (join('',@content)=~
1318: /\<$space[^\>]*\>([^\<]*)\<\/$space\>/) {
1319: return $1;
1320: }
1321: }
1322: # ---------------------------------------------------- Any other user namespace
1323: } elsif ($realm eq 'environment') {
1324: # ----------------------------------------------------------------- environment
1325: return $ENV{$spacequalifierrest};
1326: } elsif ($realm eq 'system') {
1327: # ----------------------------------------------------------------- system.time
1328: if ($space eq 'time') {
1329: return time;
1330: }
1331: }
1332: return '';
1333: }
1334:
1335: # ------------------------------------------------- Update symbolic store links
1336:
1337: sub symblist {
1338: my ($mapname,%newhash)=@_;
1339: $mapname=declutter($mapname);
1340: my %hash;
1341: if (($ENV{'request.course.fn'}) && (%newhash)) {
1342: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1343: &GDBM_WRCREAT,0640)) {
1344: map {
1345: $hash{declutter($_)}=$mapname.'___'.$newhash{$_};
1346: } keys %newhash;
1347: if (untie(%hash)) {
1348: return 'ok';
1349: }
1350: }
1351: }
1352: return 'error';
1353: }
1354:
1355: # ------------------------------------------------------ Return symb list entry
1356:
1357: sub symbread {
1358: my $thisfn=shift;
1359: unless ($thisfn) {
1360: $thisfn=$ENV{'request.filename'};
1361: }
1362: $thisfn=declutter($thisfn);
1363: my %hash;
1364: my %bighash;
1365: my $syval='';
1366: if (($ENV{'request.course.fn'}) && ($thisfn)) {
1367: if (tie(%hash,'GDBM_File',$ENV{'request.course.fn'}.'_symb.db',
1368: &GDBM_READER,0640)) {
1369: $syval=$hash{$thisfn};
1370: untie(%hash);
1371: }
1372: # ---------------------------------------------------------- There was an entry
1373: if ($syval) {
1374: unless ($syval=~/\_\d+$/) {
1375: unless ($ENV{'form.request.prefix'}=~/\.(\d+)\_$/) {
1376: &appenv('request.ambiguous' => $thisfn);
1377: return '';
1378: }
1379: $syval.=$1;
1380: }
1381: } else {
1382: # ------------------------------------------------------- Was not in symb table
1383: if (tie(%bighash,'GDBM_File',$ENV{'request.course.fn'}.'.db',
1384: &GDBM_READER,0640)) {
1385: # ---------------------------------------------- Get ID(s) for current resource
1386: my $ids=$bighash{'ids_/res/'.$thisfn};
1387: unless ($ids) {
1388: $ids=$bighash{'ids_/'.$thisfn};
1389: }
1390: if ($ids) {
1391: # ------------------------------------------------------------------- Has ID(s)
1392: my @possibilities=split(/\,/,$ids);
1393: if ($#possibilities==0) {
1394: # ----------------------------------------------- There is only one possibility
1395: my ($mapid,$resid)=split(/\./,$ids);
1396: $syval=declutter($bighash{'map_id_'.$mapid}).'___'.$resid;
1397: } else {
1398: # ------------------------------------------ There is more than one possibility
1399: my $realpossible=0;
1400: map {
1401: my $file=$bighash{'src_'.$_};
1402: if (&allowed('bre',$file)) {
1403: my ($mapid,$resid)=split(/\./,$_);
1404: if ($bighash{'map_type_'.$mapid} ne 'page') {
1405: $realpossible++;
1406: $syval=declutter($bighash{'map_id_'.$mapid}).
1407: '___'.$resid;
1408: }
1409: }
1410: } @possibilities;
1411: if ($realpossible!=1) { $syval=''; }
1412: }
1413: }
1414: untie(%bighash)
1415: }
1416: }
1417: if ($syval) {
1418: return $syval.'___'.$thisfn;
1419: }
1420: }
1421: &appenv('request.ambiguous' => $thisfn);
1422: return '';
1423: }
1424:
1425: # ---------------------------------------------------------- Return random seed
1426:
1427: sub numval {
1428: my $txt=shift;
1429: $txt=~tr/A-J/0-9/;
1430: $txt=~tr/a-j/0-9/;
1431: $txt=~tr/K-T/0-9/;
1432: $txt=~tr/k-t/0-9/;
1433: $txt=~tr/U-Z/0-5/;
1434: $txt=~tr/u-z/0-5/;
1435: $txt=~s/\D//g;
1436: return int($txt);
1437: }
1438:
1439: sub rndseed {
1440: my $symb;
1441: unless ($symb=&symbread()) { return time; }
1442: my $symbchck=unpack("%32C*",$symb);
1443: my $symbseed=numval($symb)%$symbchck;
1444: my $namechck=unpack("%32C*",$ENV{'user.name'});
1445: my $nameseed=numval($ENV{'user.name'})%$namechck;
1446: return int( $symbseed
1447: .$nameseed
1448: .unpack("%32C*",$ENV{'user.domain'})
1449: .unpack("%32C*",$ENV{'request.course.id'})
1450: .$namechck
1451: .$symbchck);
1452: }
1453:
1454: # ------------------------------------------------------------ Serves up a file
1455: # returns either the contents of the file or a -1
1456: sub getfile {
1457: my $file=shift;
1458: &repcopy($file);
1459: if (! -e $file ) { return -1; };
1460: my $fh=Apache::File->new($file);
1461: my $a='';
1462: while (<$fh>) { $a .=$_; }
1463: return $a
1464: }
1465:
1466: sub filelocation {
1467: my ($dir,$file) = @_;
1468: my $location;
1469: $file=~ s/^\s*(\S+)\s*$/$1/; ## strip off leading and trailing spaces
1470: if ($file=~m:^/~:) { # is a contruction space reference
1471: $location = $file;
1472: $location =~ s:/~(.*?)/(.*):/home/$1/public_html/$2:;
1473: } else {
1474: $file=~s/^$perlvar{'lonDocRoot'}//;
1475: $file=~s:^/*res::;
1476: if ( !( $file =~ m:^/:) ) {
1477: $location = $dir. '/'.$file;
1478: } else {
1479: $location = '/home/httpd/html/res'.$file;
1480: }
1481: }
1482: $location=~s://+:/:g; # remove duplicate /
1483: while ($location=~m:/\.\./:) {$location=~ s:/[^/]+/\.\./:/:g;} #remove dir/..
1484: return $location;
1485: }
1486:
1487: sub hreflocation {
1488: my ($dir,$file)=@_;
1489: unless (($_=~/^http:\/\//i) || ($_=~/^\//)) {
1490: my $finalpath=filelocation($dir,$file);
1491: $finalpath=~s/^\/home\/httpd\/html//;
1492: return $finalpath;
1493: } else {
1494: return $file;
1495: }
1496: }
1497:
1498: # ------------------------------------------------------------- Declutters URLs
1499:
1500: sub declutter {
1501: my $thisfn=shift;
1502: $thisfn=~s/^$perlvar{'lonDocRoot'}//;
1503: $thisfn=~s/^\///;
1504: $thisfn=~s/^res\///;
1505: return $thisfn;
1506: }
1507:
1508: # -------------------------------------------------------- Escape Special Chars
1509:
1510: sub escape {
1511: my $str=shift;
1512: $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
1513: return $str;
1514: }
1515:
1516: # ----------------------------------------------------- Un-Escape Special Chars
1517:
1518: sub unescape {
1519: my $str=shift;
1520: $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
1521: return $str;
1522: }
1523:
1524: # ================================================================ Main Program
1525:
1526: sub BEGIN {
1527: if ($readit ne 'done') {
1528: # ------------------------------------------------------------ Read access.conf
1529: {
1530: my $config=Apache::File->new("/etc/httpd/conf/access.conf");
1531:
1532: while (my $configline=<$config>) {
1533: if ($configline =~ /PerlSetVar/) {
1534: my ($dummy,$varname,$varvalue)=split(/\s+/,$configline);
1535: chomp($varvalue);
1536: $perlvar{$varname}=$varvalue;
1537: }
1538: }
1539: }
1540:
1541: # ------------------------------------------------------------- Read hosts file
1542: {
1543: my $config=Apache::File->new("$perlvar{'lonTabDir'}/hosts.tab");
1544:
1545: while (my $configline=<$config>) {
1546: my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
1547: $hostname{$id}=$name;
1548: $hostdom{$id}=$domain;
1549: if ($role eq 'library') { $libserv{$id}=$name; }
1550: }
1551: }
1552:
1553: # ------------------------------------------------------ Read spare server file
1554: {
1555: my $config=Apache::File->new("$perlvar{'lonTabDir'}/spare.tab");
1556:
1557: while (my $configline=<$config>) {
1558: chomp($configline);
1559: if (($configline) && ($configline ne $perlvar{'lonHostID'})) {
1560: $spareid{$configline}=1;
1561: }
1562: }
1563: }
1564: # ------------------------------------------------------------ Read permissions
1565: {
1566: my $config=Apache::File->new("$perlvar{'lonTabDir'}/roles.tab");
1567:
1568: while (my $configline=<$config>) {
1569: chomp($configline);
1570: my ($role,$perm)=split(/ /,$configline);
1571: if ($perm ne '') { $pr{$role}=$perm; }
1572: }
1573: }
1574:
1575: # -------------------------------------------- Read plain texts for permissions
1576: {
1577: my $config=Apache::File->new("$perlvar{'lonTabDir'}/rolesplain.tab");
1578:
1579: while (my $configline=<$config>) {
1580: chomp($configline);
1581: my ($short,$plain)=split(/:/,$configline);
1582: if ($plain ne '') { $prp{$short}=$plain; }
1583: }
1584: }
1585:
1586: # ------------------------------------------------------------- Read file types
1587: {
1588: my $config=Apache::File->new("$perlvar{'lonTabDir'}/filetypes.tab");
1589:
1590: while (my $configline=<$config>) {
1591: chomp($configline);
1592: my ($ending,$emb,@descr)=split(/\s+/,$configline);
1593: if ($descr[0] ne '') {
1594: $fe{$ending}=$emb;
1595: $fd{$ending}=join(' ',@descr);
1596: }
1597: }
1598: }
1599:
1600:
1601: $readit='done';
1602: &logthis('<font color=yellow>INFO: Read configuration</font>');
1603: }
1604: }
1605: 1;
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