--- loncom/interface/loncommon.pm 2015/03/11 01:55:41 1.1075.2.88 +++ loncom/interface/loncommon.pm 2018/03/23 01:01:21 1.1310 @@ -1,7 +1,7 @@ # The LearningOnline Network with CAPA # a pile of common routines # -# $Id: loncommon.pm,v 1.1075.2.88 2015/03/11 01:55:41 raeburn Exp $ +# $Id: loncommon.pm,v 1.1310 2018/03/23 01:01:21 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # @@ -71,12 +71,23 @@ use Apache::lonuserutils(); use Apache::lonuserstate(); use Apache::courseclassifier(); use LONCAPA qw(:DEFAULT :match); +use LONCAPA::LWPReq; use DateTime::TimeZone; -use DateTime::Locale::Catalog; +use DateTime::Locale; +use Encode(); +use Text::Aspell; use Authen::Captcha; use Captcha::reCAPTCHA; +use JSON::DWIW; +use LWP::UserAgent; use Crypt::DES; use DynaLoader; # for Crypt::DES version +use MIME::Lite; +use MIME::Types; +use File::Copy(); +use File::Path(); +use String::CRC32(); +use Short::URL(); # ---------------------------------------------- Designs use vars qw(%defaultdesign); @@ -161,6 +172,7 @@ sub ssi_with_retries { # ----------------------------------------------- Filetypes/Languages/Copyright my %language; my %supported_language; +my %supported_codes; my %latex_language; # For choosing hyphenation in my %latex_language_bykey; # for choosing hyphenation from metadata my %cprtag; @@ -195,14 +207,15 @@ BEGIN { while (my $line = <$fh>) { next if ($line=~/^\#/); chomp($line); - my ($key,$two,$country,$three,$enc,$val,$sup,$latex)=(split(/\t/,$line)); + my ($key,$code,$country,$three,$enc,$val,$sup,$latex)=(split(/\t/,$line)); $language{$key}=$val.' - '.$enc; if ($sup) { $supported_language{$key}=$sup; + $supported_codes{$key} = $code; } if ($latex) { $latex_language_bykey{$key} = $latex; - $latex_language{$two} = $latex; + $latex_language{$code} = $latex; } } close($fh); @@ -259,7 +272,7 @@ BEGIN { next if ($line =~ /^\#/); chomp($line); my ($extension,$category)=(split(/\s+/,$line,2)); - push @{$category_extensions{lc($category)}},$extension; + push(@{$category_extensions{lc($category)}},$extension); } close($fh); } @@ -532,7 +545,7 @@ ENDAUTHORBRW sub coursebrowser_javascript { my ($domainfilter,$sec_element,$formname,$role_element,$crstype, - $credits_element) = @_; + $credits_element,$instcode) = @_; my $wintitle = 'Course_Browser'; if ($crstype eq 'Community') { $wintitle = 'Community_Browser'; @@ -583,6 +596,12 @@ sub coursebrowser_javascript { var ownername = document.forms[formid].ccuname.value; var ownerdom = document.forms[formid].ccdomain.options[document.forms[formid].ccdomain.selectedIndex].value; url += '&cloner='+ownername+':'+ownerdom; + if (type == 'Course') { + url += '&crscode='+document.forms[formid].crscode.value; + } + } + if (formname == 'requestcrs') { + url += '&crsdom=$domainfilter&crscode=$instcode'; } if (multflag !=null && multflag != '') { url += '&multiple='+multflag; @@ -666,7 +685,7 @@ if (!Array.prototype.indexOf) { var n = 0; if (arguments.length > 0) { n = Number(arguments[1]); - if (n !== n) { // shortcut for verifying if it's NaN + if (n !== n) { // shortcut for verifying if it is NaN n = 0; } else if (n !== 0 && n !== (1 / 0) && n !== -(1 / 0)) { n = (n > 0 || -1) * Math.floor(Math.abs(n)); @@ -867,6 +886,8 @@ sub selectcourse_link { my $linktext = &mt('Select Course'); if ($selecttype eq 'Community') { $linktext = &mt('Select Community'); + } elsif ($selecttype eq 'Placement') { + $linktext = &mt('Select Placement Test'); } elsif ($selecttype eq 'Course/Community') { $linktext = &mt('Select Course/Community'); $type = ''; @@ -902,12 +923,12 @@ sub check_uncheck_jscript { function checkAll(field) { if (field.length > 0) { for (i = 0; i < field.length; i++) { - if (!field[i].disabled) { + if (!field[i].disabled) { field[i].checked = true; } } } else { - if (!field.disabled) { + if (!field.disabled) { field.checked = true; } } @@ -927,8 +948,8 @@ ENDSCRT } sub select_timezone { - my ($name,$selected,$onchange,$includeempty)=@_; - my $output=''."\n"; if ($includeempty) { $output .= '\n"; } $typeselectform.=""; } @@ -15009,7 +16828,7 @@ sub build_filters { if (exists($filter->{'instcodefilter'})) { # if (($fixeddom) || ($formname eq 'requestcrs') || # ($formname eq 'modifycourse') || ($formname eq 'filterpicker')) { - if ($codedom) { + if ($codedom) { $officialjs = 1; ($instcodeform,$jscript,$$numtitlesref) = &Apache::courseclassifier::instcode_selectors($codedom,'filterpicker', @@ -15138,7 +16957,7 @@ $typeelement return $jscript.$clonewarning.$output; } -=pod +=pod =item * &timebased_select_form() @@ -15153,7 +16972,7 @@ item - name of form element (sincefilter filter - anonymous hash of criteria and their values Returns: HTML for a select box contained a blank, then six time selections, - with value set in incoming form variables currently selected. + with value set in incoming form variables currently selected. Side Effects: None @@ -15190,7 +17009,7 @@ page load completion for page showing se Inputs: None -Returns: markup containing updateFilters() and hideSearching() javascript functions. +Returns: markup containing updateFilters() and hideSearching() javascript functions. Side Effects: None @@ -15229,7 +17048,7 @@ to retrieve a hash for which keys are co Inputs: -dom - domain being searched +dom - domain being searched type - course type ('Course' or 'Community' or '.' if any). @@ -15241,11 +17060,18 @@ cloneruname - optional username of new c clonerudom - optional domain of new course owner -domcloner - Optional "domcloner" flag; has value=1 if user has ccc priv in domain being filtered by, +domcloner - optional "domcloner" flag; has value=1 if user has ccc priv in domain being filtered by, (used when DC is using course creation form) codetitles - reference to array of titles of components in institutional codes (official courses). +cc_clone - escaped comma separated list of courses for which course cloner has active CC role + (and so can clone automatically) + +reqcrsdom - domain of new course, where search_courses is used to identify potential courses to clone + +reqinstcode - institutional code of new course, where search_courses is used to identify potential + courses to clone Returns: %courses - hash of courses satisfying search criteria, keys = course IDs, values are corresponding colon-separated escaped description, institutional code, owner and type. @@ -15256,7 +17082,8 @@ Side Effects: None sub search_courses { - my ($dom,$type,$filter,$numtitles,$cloneruname,$clonerudom,$domcloner,$codetitles) = @_; + my ($dom,$type,$filter,$numtitles,$cloneruname,$clonerudom,$domcloner,$codetitles, + $cc_clone,$reqcrsdom,$reqinstcode) = @_; my (%courses,%showcourses,$cloner); if (($filter->{'ownerfilter'} ne '') || ($filter->{'ownerdomfilter'} ne '')) { @@ -15304,10 +17131,10 @@ sub search_courses { $filter->{'combownerfilter'}, $filter->{'coursefilter'}, undef,undef,$type,$regexpok,undef,undef, - undef,undef,$cloner,$env{'form.cc_clone'}, + undef,undef,$cloner,$cc_clone, $filter->{'cloneableonly'}, $createdbefore,$createdafter,undef, - $domcloner); + $domcloner,undef,$reqcrsdom,$reqinstcode); if (($filter->{'personfilter'} ne '') && ($filter->{'persondomfilter'} ne '')) { my $ccrole; if ($type eq 'Community') { @@ -15327,7 +17154,7 @@ sub search_courses { if (ref($courses{$cid}) eq 'HASH') { if (ref($courses{$cid}{roles}) eq 'ARRAY') { if (!grep(/^\Q$courserole\E$/,@{$courses{$cid}{roles}})) { - push (@{$courses{$cid}{roles}},$courserole); + push(@{$courses{$cid}{roles}},$courserole); } } else { $courses{$cid}{roles} = [$courserole]; @@ -15370,8 +17197,8 @@ $required - LON-CAPA version needed by c Returns: -$switchserver - query string tp append to /adm/switchserver call (if - current server's LON-CAPA version is too old. +$switchserver - query string tp append to /adm/switchserver call (if + current server's LON-CAPA version is too old. $warning - Message is displayed if no suitable server could be found. @@ -15484,7 +17311,7 @@ Inputs: $loncaparev - Version on current server (format: Major.Minor.Subrelease-datestamp) $interval (optional) - Time which may elapse (in s) between last check for content - change in current course. (default: 600 s). + change in current course. (default: 600 s). Returns: an array; first element is: @@ -15492,9 +17319,9 @@ Returns: an array; first element is: 'switch' - if content updates mean user's session needs to be switched to a server running a newer LON-CAPA version - + 'update' - if course session needs to be refreshed (i.e., Big Hash needs to be reloaded) - on current server hosting user's session + on current server hosting user's session '' - if no action required. @@ -15502,10 +17329,10 @@ Returns: an array; first element is: If first item element is 'switch': -second item is $switchwarning - Warning message if no suitable server found to host session. +second item is $switchwarning - Warning message if no suitable server found to host session. third item is $switchserver - query string to append to /adm/switchserver containing lonHostID - and current role. + and current role. otherwise: no other elements returned. @@ -15523,8 +17350,12 @@ sub needs_coursereinit { $interval = 600; } if (($now-$env{'request.course.timechecked'})>$interval) { - my $lastchange = &Apache::lonnet::get_coursechange($cdom,$cnum); &Apache::lonnet::appenv({'request.course.timechecked'=>$now}); + my $blocked = &blocking_status('reinit',$cnum,$cdom,undef,1); + if ($blocked) { + return (); + } + my $lastchange = &Apache::lonnet::get_coursechange($cdom,$cnum); if ($lastchange > $env{'request.course.tied'}) { my %curr_reqd_hash = &Apache::lonnet::userenvironment($cdom,$cnum,'internal.releaserequired'); if ($curr_reqd_hash{'internal.releaserequired'} ne '') { @@ -15550,19 +17381,31 @@ sub update_content_constraints { my ($cdom,$cnum,$chome,$cid) = @_; my %curr_reqd_hash = &Apache::lonnet::userenvironment($cdom,$cnum,'internal.releaserequired'); my ($reqdmajor,$reqdminor) = split(/\./,$curr_reqd_hash{'internal.releaserequired'}); - my %checkresponsetypes; + my (%checkresponsetypes,%checkcrsrestypes); foreach my $key (keys(%Apache::lonnet::needsrelease)) { my ($item,$name,$value) = split(/:/,$key); if ($item eq 'resourcetag') { if ($name eq 'responsetype') { $checkresponsetypes{$value} = $Apache::lonnet::needsrelease{$key} } + } elsif ($item eq 'course') { + if ($name eq 'courserestype') { + $checkcrsrestypes{$value} = $Apache::lonnet::needsrelease{$key}; + } } } my $navmap = Apache::lonnavmaps::navmap->new(); if (defined($navmap)) { - my %allresponses; - foreach my $res ($navmap->retrieveResources(undef,sub { $_[0]->is_problem() },1,0)) { + my (%allresponses,%allcrsrestypes); + foreach my $res ($navmap->retrieveResources(undef,sub { $_[0]->is_problem() || $_[0]->is_tool() },1,0)) { + if ($res->is_tool()) { + if ($allcrsrestypes{'exttool'}) { + $allcrsrestypes{'exttool'} ++; + } else { + $allcrsrestypes{'exttool'} = 1; + } + next; + } my %responses = $res->responseTypes(); foreach my $key (keys(%responses)) { next unless(exists($checkresponsetypes{$key})); @@ -15575,8 +17418,24 @@ sub update_content_constraints { ($reqdmajor,$reqdminor) = ($major,$minor); } } + foreach my $key (keys(%allcrsrestypes)) { + my ($major,$minor) = split(/\./,$checkcrsrestypes{$key}); + if (($major > $reqdmajor) || ($major == $reqdmajor && $minor > $reqdminor)) { + ($reqdmajor,$reqdminor) = ($major,$minor); + } + } undef($navmap); } + my $suppmap = 'supplemental.sequence'; + my ($suppcount,$supptools,$errors) = (0,0,0); + ($suppcount,$supptools,$errors) = &recurse_supplemental($cnum,$cdom,$suppmap, + $suppcount,$supptools,$errors); + if ($supptools) { + my ($major,$minor) = split(/\./,$checkcrsrestypes{'exttool'}); + if (($major > $reqdmajor) || ($major == $reqdmajor && $minor > $reqdminor)) { + ($reqdmajor,$reqdminor) = ($major,$minor); + } + } unless (($reqdmajor eq '') && ($reqdminor eq '')) { &Apache::lonnet::update_released_required($reqdmajor.'.'.$reqdminor,$cdom,$cnum,$chome,$cid); } @@ -15633,7 +17492,7 @@ sub parse_supplemental_title { } sub recurse_supplemental { - my ($cnum,$cdom,$suppmap,$numfiles,$errors) = @_; + my ($cnum,$cdom,$suppmap,$numfiles,$numexttools,$errors) = @_; if ($suppmap) { my ($errtext,$fatal) = &LONCAPA::map::mapread('/uploaded/'.$cdom.'/'.$cnum.'/'.$suppmap); if ($fatal) { @@ -15644,8 +17503,12 @@ sub recurse_supplemental { my ($title,$src,$ext,$type,$status)=split(/\:/,$res); if (($src ne '') && ($status eq 'res')) { if ($src =~ m{^\Q/uploaded/$cdom/$cnum/\E(supplemental_\d+\.sequence)$}) { - ($numfiles,$errors) = &recurse_supplemental($cnum,$cdom,$1,$numfiles,$errors); + ($numfiles,$numexttools,$errors) = &recurse_supplemental($cnum,$cdom,$1, + $numfiles,$numexttools,$errors); } else { + if ($src =~ m{^/adm/$cdom/$cnum/\d+/ext\.tool$}) { + $numexttools ++; + } $numfiles ++; } } @@ -15653,12 +17516,12 @@ sub recurse_supplemental { } } } - return ($numfiles,$errors); + return ($numfiles,$numexttools,$errors); } sub symb_to_docspath { - my ($symb) = @_; - return unless ($symb); + my ($symb,$navmapref) = @_; + return unless ($symb && ref($navmapref)); my ($mapurl,$id,$resurl) = &Apache::lonnet::decode_symb($symb); if ($resurl=~/\.(sequence|page)$/) { $mapurl=$resurl; @@ -15666,9 +17529,11 @@ sub symb_to_docspath { $mapurl=$env{'course.'.$env{'request.course.id'}.'.url'}; } my $mapresobj; - my $navmap = Apache::lonnavmaps::navmap->new(); - if (ref($navmap)) { - $mapresobj = $navmap->getResourceByUrl($mapurl); + unless (ref($$navmapref)) { + $$navmapref = Apache::lonnavmaps::navmap->new(); + } + if (ref($$navmapref)) { + $mapresobj = $$navmapref->getResourceByUrl($mapurl); } $mapurl=~s{^.*/([^/]+)\.(\w+)$}{$1}; my $type=$2; @@ -15678,7 +17543,7 @@ sub symb_to_docspath { if ($pcslist ne '') { foreach my $pc (split(/,/,$pcslist)) { next if ($pc <= 1); - my $res = $navmap->getByMapPc($pc); + my $res = $$navmapref->getByMapPc($pc); if (ref($res)) { my $thisurl = $res->src(); $thisurl=~s{^.*/([^/]+)\.\w+$}{$1}; @@ -15727,29 +17592,30 @@ sub symb_to_docspath { sub captcha_display { my ($context,$lonhost) = @_; my ($output,$error); - my ($captcha,$pubkey,$privkey) = &get_captcha_config($context,$lonhost); + my ($captcha,$pubkey,$privkey,$version) = + &get_captcha_config($context,$lonhost); if ($captcha eq 'original') { $output = &create_captcha(); unless ($output) { $error = 'captcha'; } } elsif ($captcha eq 'recaptcha') { - $output = &create_recaptcha($pubkey); + $output = &create_recaptcha($pubkey,$version); unless ($output) { $error = 'recaptcha'; } } - return ($output,$error,$captcha); + return ($output,$error,$captcha,$version); } sub captcha_response { my ($context,$lonhost) = @_; my ($captcha_chk,$captcha_error); - my ($captcha,$pubkey,$privkey) = &get_captcha_config($context,$lonhost); + my ($captcha,$pubkey,$privkey,$version) = &get_captcha_config($context,$lonhost); if ($captcha eq 'original') { ($captcha_chk,$captcha_error) = &check_captcha(); } elsif ($captcha eq 'recaptcha') { - $captcha_chk = &check_recaptcha($privkey); + $captcha_chk = &check_recaptcha($privkey,$version); } else { $captcha_chk = 1; } @@ -15758,7 +17624,7 @@ sub captcha_response { sub get_captcha_config { my ($context,$lonhost) = @_; - my ($captcha,$pubkey,$privkey,$hashtocheck); + my ($captcha,$pubkey,$privkey,$version,$hashtocheck); my $hostname = &Apache::lonnet::hostname($lonhost); my $serverhomeID = &Apache::lonnet::get_server_homeID($hostname); my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID); @@ -15774,6 +17640,10 @@ sub get_captcha_config { } if ($privkey && $pubkey) { $captcha = 'recaptcha'; + $version = $hashtocheck->{'recaptchaversion'}; + if ($version ne '2') { + $version = 1; + } } else { $captcha = 'original'; } @@ -15791,6 +17661,10 @@ sub get_captcha_config { $privkey = $domconfhash{$serverhomedom.'.login.recaptchakeys_private'}; if ($privkey && $pubkey) { $captcha = 'recaptcha'; + $version = $domconfhash{$serverhomedom.'.login.recaptchaversion'}; + if ($version ne '2') { + $version = 1; + } } else { $captcha = 'original'; } @@ -15798,7 +17672,7 @@ sub get_captcha_config { $captcha = 'original'; } } - return ($captcha,$pubkey,$privkey); + return ($captcha,$pubkey,$privkey,$version); } sub create_captcha { @@ -15857,38 +17731,66 @@ sub check_captcha { } sub create_recaptcha { - my ($pubkey) = @_; - my $use_ssl; - if ($ENV{'SERVER_PORT'} == 443) { - $use_ssl = 1; - } - my $captcha = Captcha::reCAPTCHA->new; - return $captcha->get_options_setter({theme => 'white'})."\n". - $captcha->get_html($pubkey,undef,$use_ssl). - &mt('If either word is hard to read, [_1] will replace them.', - 'reCAPTCHA refresh'). - '

'; + my ($pubkey,$version) = @_; + if ($version >= 2) { + return '
'; + } else { + my $use_ssl; + if ($ENV{'SERVER_PORT'} == 443) { + $use_ssl = 1; + } + my $captcha = Captcha::reCAPTCHA->new; + return $captcha->get_options_setter({theme => 'white'})."\n". + $captcha->get_html($pubkey,undef,$use_ssl). + &mt('If the text is hard to read, [_1] will replace them.', + 'reCAPTCHA refresh'). + '

'; + } } sub check_recaptcha { - my ($privkey) = @_; + my ($privkey,$version) = @_; my $captcha_chk; - my $captcha = Captcha::reCAPTCHA->new; - my $captcha_result = - $captcha->check_answer( - $privkey, - $ENV{'REMOTE_ADDR'}, - $env{'form.recaptcha_challenge_field'}, - $env{'form.recaptcha_response_field'}, - ); - if ($captcha_result->{is_valid}) { - $captcha_chk = 1; + if ($version >= 2) { + my %info = ( + secret => $privkey, + response => $env{'form.g-recaptcha-response'}, + remoteip => $ENV{'REMOTE_ADDR'}, + ); + my $request=new HTTP::Request('POST','https://www.google.com/recaptcha/api/siteverify'); + $request->content(join('&',map { + my $name = escape($_); + "$name=" . ( ref($info{$_}) eq 'ARRAY' + ? join("&$name=", map {escape($_) } @{$info{$_}}) + : &escape($info{$_}) ); + } keys(%info))); + my $response = &LONCAPA::LWPReq::makerequest('',$request,'','',10,1); + if ($response->is_success) { + my $data = JSON::DWIW->from_json($response->decoded_content); + if (ref($data) eq 'HASH') { + if ($data->{'success'}) { + $captcha_chk = 1; + } + } + } + } else { + my $captcha = Captcha::reCAPTCHA->new; + my $captcha_result = + $captcha->check_answer( + $privkey, + $ENV{'REMOTE_ADDR'}, + $env{'form.recaptcha_challenge_field'}, + $env{'form.recaptcha_response_field'}, + ); + if ($captcha_result->{is_valid}) { + $captcha_chk = 1; + } } return $captcha_chk; } sub emailusername_info { - my @fields = ('firstname','lastname','institution','web','location','officialemail'); + my @fields = ('firstname','lastname','institution','web','location','officialemail','id'); my %titles = &Apache::lonlocal::texthash ( lastname => 'Last Name', firstname => 'First Name', @@ -15896,6 +17798,7 @@ sub emailusername_info { location => "School's city, state/province, country", web => "School's web address", officialemail => 'E-mail address at institution (if different)', + id => 'Student/Employee ID', ); return (\@fields,\%titles); } @@ -15924,21 +17827,37 @@ sub cleanup_html { # Checks for critical messages and returns a redirect url if one exists. # $interval indicates how often to check for messages. +# $context is the calling context -- roles, grades, contents, menu or flip. sub critical_redirect { - my ($interval) = @_; + my ($interval,$context) = @_; if ((time-$env{'user.criticalcheck.time'})>$interval) { - my @what=&Apache::lonnet::dump('critical', $env{'user.domain'}, + if (($env{'request.course.id'}) && (($context eq 'flip') || ($context eq 'contents'))) { + my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'}; + my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'}; + my $blocked = &blocking_status('alert',$cnum,$cdom,undef,1); + if ($blocked) { + my $checkrole = "cm./$cdom/$cnum"; + if ($env{'request.course.sec'} ne '') { + $checkrole .= "/$env{'request.course.sec'}"; + } + unless ((&Apache::lonnet::allowed('evb',undef,undef,$checkrole)) && + ($env{'request.role'} !~ m{^st\./$cdom/$cnum})) { + return; + } + } + } + my @what=&Apache::lonnet::dump('critical', $env{'user.domain'}, $env{'user.name'}); &Apache::lonnet::appenv({'user.criticalcheck.time'=>time}); my $redirecturl; if ($what[0]) { - if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { - $redirecturl='/adm/email?critical=display'; - my $url=&Apache::lonnet::absolute_url().$redirecturl; + if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { + $redirecturl='/adm/email?critical=display'; + my $url=&Apache::lonnet::absolute_url().$redirecturl; return (1, $url); } } - } + } return (); } @@ -15976,14 +17895,158 @@ sub des_decrypt { } else { $cypher=new DES $keybin; } - my $plaintext= - $cypher->decrypt(unpack("a8",pack("H16",substr($cyphertext,0,16)))); - $plaintext.= - $cypher->decrypt(unpack("a8",pack("H16",substr($cyphertext,16,16)))); - $plaintext=substr($plaintext,1,ord(substr($plaintext,0,1)) ); + my $plaintext=''; + my $cypherlength = length($cyphertext); + my $numchunks = int($cypherlength/32); + for (my $j=0; $j<$numchunks; $j++) { + my $start = $j*32; + my $cypherblock = substr($cyphertext,$start,32); + my $chunk = + $cypher->decrypt(unpack("a8",pack("H16",substr($cypherblock,0,16)))); + $chunk .= + $cypher->decrypt(unpack("a8",pack("H16",substr($cypherblock,16,16)))); + $chunk=substr($chunk,1,ord(substr($chunk,0,1)) ); + $plaintext .= $chunk; + } return $plaintext; } +sub make_short_symbs { + my ($cdom,$cnum,$navmap) = @_; + return unless (ref($navmap)); + my ($numnew,@errors); + my @toshorten = &Apache::loncommon::get_env_multiple('form.addtiny'); + if (@toshorten) { + my (%maps,%resources,%titles); + &Apache::loncourserespicker::enumerate_course_contents($navmap,\%maps,\%resources,\%titles, + 'shorturls',$cdom,$cnum); + my %tocreate; + if (keys(%resources)) { + foreach my $item (sort {$a <=> $b} (@toshorten)) { + my $symb = $resources{$item}; + if ($symb) { + $tocreate{$cnum.'&'.$symb} = 1; + } + } + } + if (keys(%tocreate)) { + my %coursetiny = &Apache::lonnet::dump('tiny',$cdom,$cnum); + my $su = Short::URL->new(no_vowels => 1); + my $init = ''; + my (%newunique,%addcourse,%courseonly,%failed); + # get lock on tiny db + my $now = time; + my $lockhash = { + "lock\0$now" => $env{'user.name'}. + ':'.$env{'user.domain'}, + }; + my $tries = 0; + my $gotlock = &Apache::lonnet::newput_dom('tiny',$lockhash,$cdom); + my ($code,$error); + while (($gotlock ne 'ok') && ($tries<3)) { + $tries ++; + sleep 1; + $gotlock = &Apache::lonnet::newput_dom('uniquecodes',$lockhash,$cdom); + } + if ($gotlock eq 'ok') { + $init = &shorten_symbs($cdom,$init,$su,\%coursetiny,\%tocreate,\%newunique, + \%addcourse,\%courseonly,\%failed); + if (keys(%failed)) { + my $numfailed = scalar(keys(%failed)); + push(@errors,&mt('error: could not obtain unique six character URL for [quant,_1,resource]',$numfailed)); + } + if (keys(%newunique)) { + my $putres = &Apache::lonnet::newput_dom('tiny',\%newunique,$cdom); + if ($putres eq 'ok') { + $numnew = scalar(keys(%newunique)); + my $newputres = &Apache::lonnet::newput('tiny',\%addcourse,$cdom,$cnum); + unless ($newputres eq 'ok') { + push(@errors,&mt('error: could not store course look-up of short URLs')); + } + } else { + push(@errors,&mt('error: could not store unique six character URLs')); + } + } + my $dellockres = &Apache::lonnet::del_dom('tiny',["lock\0$now"],$cdom); + unless ($dellockres eq 'ok') { + push(@errors,&mt('error: could not release lockfile')); + } + } else { + push(@errors,&mt('error: could not obtain lockfile')); + } + if (keys(%courseonly)) { + my $result = &Apache::lonnet::newput('tiny',\%courseonly,$cdom,$cnum); + if ($result ne 'ok') { + push(@errors,&mt('error: could not update course look-up of short URLs')); + } + } + } + } + return ($numnew,\@errors); +} + +sub shorten_symbs { + my ($cdom,$init,$su,$coursetiny,$tocreate,$newunique,$addcourse,$courseonly,$failed) = @_; + return unless ((ref($su)) && (ref($coursetiny) eq 'HASH') && (ref($tocreate) eq 'HASH') && + (ref($newunique) eq 'HASH') && (ref($addcourse) eq 'HASH') && + (ref($courseonly) eq 'HASH') && (ref($failed) eq 'HASH')); + my (%possibles,%collisions); + foreach my $key (keys(%{$tocreate})) { + my $num = String::CRC32::crc32($key); + my $tiny = $su->encode($num,$init); + if ($tiny) { + $possibles{$tiny} = $key; + } + } + if (!$init) { + $init = 1; + } else { + $init ++; + } + if (keys(%possibles)) { + my @posstiny = keys(%possibles); + my $configuname = &Apache::lonnet::get_domainconfiguser($cdom); + my %currtiny = &Apache::lonnet::get('tiny',\@posstiny,$cdom,$configuname); + if (keys(%currtiny)) { + foreach my $key (keys(%currtiny)) { + next if ($currtiny{$key} eq ''); + if ($currtiny{$key} eq $possibles{$key}) { + my ($tcnum,$tsymb) = split(/\&/,$currtiny{$key}); + unless (($coursetiny->{$tsymb} eq $key) || ($addcourse->{$tsymb} eq $key) || ($courseonly->{$tsymb} eq $key)) { + $courseonly->{$tsymb} = $key; + } + } else { + $collisions{$possibles{$key}} = 1; + } + delete($possibles{$key}); + } + } + foreach my $key (keys(%possibles)) { + $newunique->{$key} = $possibles{$key}; + my ($tcnum,$tsymb) = split(/\&/,$possibles{$key}); + unless (($coursetiny->{$tsymb} eq $key) || ($addcourse->{$tsymb} eq $key) || ($courseonly->{$tsymb} eq $key)) { + $addcourse->{$tsymb} = $key; + } + } + } + if (keys(%collisions)) { + if ($init <5) { + if (!$init) { + $init = 1; + } else { + $init ++; + } + $init = &shorten_symbs($cdom,$init,$su,$coursetiny,\%collisions, + $newunique,$addcourse,$courseonly,$failed); + } else { + foreach my $key (keys(%collisions)) { + $failed->{$key} = 1; + } + } + } + return $init; +} + 1; __END__;