--- rat/lonpageflip.pm 2005/08/02 21:15:52 1.55 +++ rat/lonpageflip.pm 2013/11/28 02:23:25 1.83 @@ -2,7 +2,7 @@ # # Page flip handler # -# $Id: lonpageflip.pm,v 1.55 2005/08/02 21:15:52 albertel Exp $ +# $Id: lonpageflip.pm,v 1.83 2013/11/28 02:23:25 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # @@ -27,11 +27,15 @@ # http://www.lon-capa.org/ # + + package Apache::lonpageflip; use strict; +use LONCAPA; use Apache::Constants qw(:common :http REDIRECT); use Apache::lonnet; +use Apache::loncommon(); use HTML::TokeParser; use GDBM_File; @@ -46,6 +50,7 @@ sub cleanup { &Apache::lonnet::logthis('Failed cleanup pageflip: hash'); } } + return OK; } sub addrid { @@ -73,13 +78,50 @@ sub fullmove { sub hash_src { my ($id)=@_; + my ($mapid,$resid)=split(/\./,$id); + my $symb=&Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, + $resid,$hash{'src_'.$id}); if ($hash{'encrypted_'.$id}) { - return &Apache::lonenc::encrypted($hash{'src_'.$id}); + return (&Apache::lonenc::encrypted($hash{'src_'.$id}), + &Apache::lonenc::encrypted($symb)); } - return $hash{'src_'.$id}; + return ($hash{'src_'.$id},$symb); } sub move { + my ($next,$endupmap,$direction) = @_; + my $safecount=0; + my $allowed=0; + do { + ($next,$endupmap)=&get_next_possible_move($next,$endupmap,$direction); + + my $url = $hash{'src_'.$next}; + my ($mapid,$resid)=split(/\./,$next); + my $symb = &Apache::lonnet::encode_symb($hash{'map_id_'.$mapid}, + $resid,$url); + if ($url eq '' || $symb eq '') { + $allowed = 0; + } else { + my $priv = &Apache::lonnet::allowed('bre',$url,$symb); + $allowed = (($priv eq 'F') || ($priv eq '2')); + } + $safecount++; + } while ( ($next) + && ($next!~/\,/) + && ( + (!$hash{'src_'.$next}) + || ( + (!$env{'request.role.adv'}) + && $hash{'randomout_'.$next} + ) + || (!$allowed) + ) + && ($safecount<10000)); + + return ($next,$endupmap); +} + +sub get_next_possible_move { my ($rid,$mapurl,$direction)=@_; my $startoutrid=$rid; @@ -92,25 +134,27 @@ sub move { while ($hash{'type_'.$rid} eq 'finish') { $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; } - map { - my $thiscond= - &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); - if ($thiscond>=$mincond) { + foreach my $id (split(/\,/,$hash{'to_'.$rid})) { + my $condition= $hash{'conditions_'.$hash{'goesto_'.$id}}; + my $rescond = &Apache::lonnet::docondval($condition); + my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}}); + my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond; + if ($thiscond>=$mincond) { if ($posnext) { - $posnext.=','.$_.':'.$thiscond; + $posnext.=','.$id.':'.$thiscond; } else { - $posnext=$_.':'.$thiscond; + $posnext=$id.':'.$thiscond; } if ($thiscond>$mincond) { $mincond=$thiscond; } } - } split(/\,/,$hash{'to_'.$rid}); - map { - my ($linkid,$condval)=split(/\:/,$_); + } + foreach my $id (split(/\,/,$posnext)) { + my ($linkid,$condval)=split(/\:/,$id); if ($condval>=$mincond) { $next=&addrid($next,$hash{'goesto_'.$linkid}, $hash{'condid_'.$hash{'undercond_'.$linkid}}); } - } split(/\,/,$posnext); + } if ($hash{'is_map_'.$next}) { # This jumps to the beginning of a new map (going down level) if ( @@ -126,31 +170,33 @@ sub move { ((split(/\./,$startoutrid))[0]!=(split(/\./,$next))[0]) { # This comes up from a map (coming up one level); $mapurl=$hash{'map_id_'.(split(/\./,$next))[0]}; - } + } } elsif ($direction eq 'back') { # ------------------------------------------------------------------- Backwards while ($hash{'type_'.$rid} eq 'start') { $rid=$hash{'ids_'.$hash{'map_id_'.(split(/\./,$rid))[0]}}; } - map { - my $thiscond= - &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); - if ($thiscond>=$mincond) { - if ($posnext) { - $posnext.=','.$_.':'.$thiscond; - } else { - $posnext=$_.':'.$thiscond; - } - if ($thiscond>$mincond) { $mincond=$thiscond; } - } - } split(/\,/,$hash{'from_'.$rid}); - map { - my ($linkid,$condval)=split(/\:/,$_); - if ($condval>=$mincond) { - $next=&addrid($next,$hash{'comesfrom_'.$linkid}, - $hash{'condid_'.$hash{'undercond_'.$linkid}}); - } - } split(/\,/,$posnext); + foreach my $id (split(/\,/,$hash{'from_'.$rid})) { + my $condition= $hash{'conditions_'.$hash{'comesfrom_'.$id}}; + my $rescond = &Apache::lonnet::docondval($condition); + my $linkcond = &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$id}}); + my $thiscond = ($rescond<$linkcond)?$rescond:$linkcond; + if ($thiscond>=$mincond) { + if ($posnext) { + $posnext.=','.$id.':'.$thiscond; + } else { + $posnext=$id.':'.$thiscond; + } + if ($thiscond>$mincond) { $mincond=$thiscond; } + } + } + foreach my $id (split(/\,/,$posnext)) { + my ($linkid,$condval)=split(/\:/,$id); + if ($condval>=$mincond) { + $next=&addrid($next,$hash{'comesfrom_'.$linkid}, + $hash{'condid_'.$hash{'undercond_'.$linkid}}); + } + } if ($hash{'is_map_'.$next}) { # This jumps to the end of a new map (going down one level) if ( @@ -171,28 +217,35 @@ sub move { return ($next,$mapurl); } -sub navlaunch { - my ($r)=@_; - &Apache::loncommon::content_type($r,'text/html'); - &Apache::loncommon::no_cache($r); - $r->send_http_header; - my $html=&Apache::lonxml::xmlbegin(); - $r->print("$html\n"); - $r->print(''. - &Apache::loncommon::bodytag('Launched')); - $r->print(<Goto first resource

- -

Collapse external navigation window

-ENDNAV - $r->print(&Apache::loncommon::endbodytag().''); + untie(%hash); + return $furl; + } else { + return '/adm/navmaps'; + } } + # ================================================================ Main Handler sub handler { @@ -209,7 +262,7 @@ sub handler { my %cachehash=(); my $multichoice=0; my %multichoicehash=(); - my $redirecturl=''; + my ($redirecturl,$redirectsymb); my $next=''; my @possibilities=(); &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['postdata']); @@ -222,19 +275,14 @@ sub handler { } $currenturl=~s/\.\d+\.(\w+)$/\.$1/; if ($direction eq 'firstres') { - my $furl; - if (tie(my %bighash,'GDBM_File',$env{'request.course.fn'}.'.db', - &GDBM_READER(),0640)) { - $furl=$bighash{'first_url'}; - untie(%bighash); - } + my $furl=&first_accessible_resource(); &Apache::loncommon::content_type($r,'text/html'); $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.$furl); + &Apache::lonnet::absolute_url().$furl); return REDIRECT; } - if ($direction eq 'return' || $direction eq 'navlaunch') { + if ($direction eq 'return') { # -------------------------------------------------------- Return to last known my $last; if (tie(%hash,'GDBM_File',$env{'request.course.fn'}.'_symb.db', @@ -252,24 +300,19 @@ sub handler { if ($hash{'encrypted_'.$id}) { $newloc=&Apache::lonenc::encrypted($newloc); } } else { - $newloc='/adm/noidea.html'; + $newloc='/adm/navmaps'; } untie %hash; } else { - $newloc='/adm/noidea.html'; + $newloc='/adm/navmaps'; } - if ($newloc eq '/adm/noidea.html' && $direction eq 'navlaunch') { - &navlaunch($r); - return OK; - } else { &Apache::loncommon::content_type($r,'text/html'); $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.$newloc); + &Apache::lonnet::absolute_url().$newloc); return REDIRECT; - } } - $currenturl=~s/^http\:\/\///; + $currenturl=~s/^https?\:\/\///; $currenturl=~s/^[^\/]+//; # # Is the current URL on the map? If not, start with last known URL @@ -284,15 +327,11 @@ sub handler { if ($last) { $currenturl=&Apache::lonnet::clutter((&Apache::lonnet::decode_symb($last))[2]); } else { - if ($direction eq 'return') { &Apache::loncommon::content_type($r,'text/html'); $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.'/adm/noidea.html'); + &Apache::lonnet::absolute_url(). + '/adm/noidea.html'); return REDIRECT; - } else { - &navlaunch($r); - return OK; - } } } # ------------------------------------------- Do we have any idea where we are? @@ -314,41 +353,33 @@ sub handler { my $endupmap; ($next,$endupmap)=&move($rid,$startoutmap,$direction); # -------------------------------------- Do we have one and only one empty URL? - my $safecount=0; - while (($next) && ($next!~/\,/) && - ((!$hash{'src_'.$next}) || - ((!$env{'request.role.adv'}) && $hash{'randomout_'.$next})) - && ($safecount<10000)) { - ($next,$endupmap)=&move($next,$endupmap,$direction); - $safecount++; - } # We are now at at least one non-empty URL # ----------------------------------------------------- Check out possibilities if ($next) { @possibilities=split(/\,/,$next); if ($#possibilities==0) { # ---------------------------------------------- Only one possibility, redirect - $redirecturl=&hash_src($next); + ($redirecturl,$redirectsymb)=&hash_src($next); $cachehash{$endupmap}{$redirecturl}= [$redirecturl,(split(/\./,$next))[1]]; } else { # ------------------------ There are multiple possibilities for a next resource $multichoice=1; - map { - $multichoicehash{'src_'.$_}=$hash{'src_'.$_}; - $multichoicehash{'title_'.$_}=$hash{'title_'.$_}; - $multichoicehash{'type_'.$_}=$hash{'type_'.$_}; - (my $first, my $second) = $_ =~ /(\d+).(\d+)/; - my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$_}); - $multichoicehash{'symb_'.$_} = + foreach my $id (@possibilities) { + $multichoicehash{'src_'.$id}=$hash{'src_'.$id}; + $multichoicehash{'title_'.$id}=$hash{'title_'.$id}; + $multichoicehash{'type_'.$id}=$hash{'type_'.$id}; + (my $first, my $second) = $id =~ /(\d+).(\d+)/; + my $symbSrc = Apache::lonnet::declutter($hash{'src_'.$id}); + $multichoicehash{'symb_'.$id} = Apache::lonnet::declutter($hash{'map_id_'.$first}.'___'. $second.'___'.$symbSrc); - my ($choicemap,$choiceres)=split(/\./,$_); + my ($choicemap,$choiceres)=split(/\./,$id); my $map=&Apache::lonnet::declutter($hash{'src_'.$choicemap}); - my $url=$multichoicehash{'src_'.$_}; + my $url=$multichoicehash{'src_'.$id}; $cachehash{$map}{$url}=[$url,$choiceres]; - } @possibilities; + } } } else { # -------------------------------------------------------------- No place to go @@ -382,61 +413,73 @@ sub handler { if (($what[0] ne 'con_lost') && ($what[0]!~/^error\:/)) { $redirecturl='/adm/email?critical=display'; + $redirectsymb=''; } } - &Apache::lonnet::appenv('user.criticalcheck.time'=>time); + &Apache::lonnet::appenv({'user.criticalcheck.time'=>time}); } &Apache::loncommon::content_type($r,'text/html'); - $r->header_out(Location => - 'http://'.$ENV{'HTTP_HOST'}.$redirecturl); + my $url=&Apache::lonnet::absolute_url().$redirecturl; + $url = &add_get_param($url, { 'symb' => $redirectsymb}); + $r->header_out(Location => $url); return REDIRECT; } else { # --------------------------------------------------------- There was a problem &Apache::loncommon::content_type($r,'text/html'); $r->send_http_header; + my %lt=&Apache::lonlocal::texthash('title' => 'End of Sequence', + 'explain' => + 'You have reached the end of the sequence of materials.', + 'back' => 'Go Back', + 'nav' => 'Course Contents', + 'wherenext' => + 'There are several possibilities of where to go next', + 'pick' => + 'Please click on the the resource you intend to access', + 'titleheader' => 'Title', + 'type' => 'Type'); + if (&Apache::loncommon::course_type() eq 'Community') { + $lt{'nav'} = &mt('Community Contents'); + } if ($#possibilities>0) { - my $bodytag= - &Apache::loncommon::bodytag('Multiple Resources'); + my $start_page= + &Apache::loncommon::start_page('Multiple Resources'); $r->print(<Choose Next Location -$bodytag -

There are several possibilities of where to go next

+$start_page +

$lt{'wherenext'}

-Please click on the the resource you intend to access: +$lt{'pick'}:

- - +
TitleType
+ ENDSTART - foreach (@possibilities) { + foreach my $id (@possibilities) { $r->print( ''); } - $r->print('
$lt{'titleheader'}$lt{'type'}
'. - $multichoicehash{'title_'.$_}. - ''.$multichoicehash{'type_'.$_}. + &add_get_param($multichoicehash{'src_'.$id}, + {'symb' => + $multichoicehash{'symb_'.$id}, + }).'">'. + $multichoicehash{'title_'.$id}. + ''.$multichoicehash{'type_'.$id}. '
'); - return OK; + $r->print(''); } else { - my $bodytag=&Apache::loncommon::bodytag('No Resource'); - $r->print(<No Resource -$bodytag -

Next resource could not be identified.

-

You probably are at the beginning or the end of the -course.

- - - -ENDNONE - return OK; - } - } + $r->print( + &Apache::loncommon::start_page('No Resource') + .'

'.$lt{'title'}.'

' + .'

'.$lt{'explain'}.'

'); + } + $r->print( + &Apache::lonhtmlcommon::actionbox( + [''.$lt{'back'}.'', + ''.$lt{'nav'}.'' + ]) + .&Apache::loncommon::end_page()); + return OK; + } } else { # ------------------------------------------------- Problem, could not tie hash $env{'user.error.msg'}="/adm/flip:bre:0:1:Course Data Missing"; @@ -444,10 +487,8 @@ ENDNONE } } else { # ---------------------------------------- No, could not determine where we are - if ( &Apache::lonnet::mod_perl_version() == 2 ) { - &Apache::lonnet::cleanenv(); - } $r->internal_redirect('/adm/ambiguous'); + return OK; } } else { # -------------------------- Class was not initialized or page fliped strangely @@ -459,6 +500,44 @@ ENDNONE 1; __END__ +=pod + +=head1 NAME + +Apache::lonpageflip + +=head1 SYNOPSIS + +Deals with forward, backward, and other page flips. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +=head1 OVERVIEW + +(empty) + +=head1 SUBROUTINES + +=over cleanup() + +=item addrid() + +=item fullmove() + +=item hash_src() + +=item move() + +=item get_next_possible_move() + +=item first_accessible_resource() + +=item handler() + +=back + +=cut