# The LearningOnline Network
# Syllabus
#
# $Id: lonsyllabus.pm,v 1.138.2.5.2.2 2020/01/20 17:21:08 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#

package Apache::lonsyllabus;

use strict;
use Apache::lontemplate;
use Apache::Constants qw(:common);
use Apache::loncommon;
use Apache::lonnet;
use Apache::lontexconvert;
use Apache::lonfeedback;
use Apache::lonhtmlgateway;
use Apache::lonannounce;
use Apache::lonlocal;
use Apache::lonhtmlcommon;
use Apache::lonspeller();
use HTML::Entities();

sub handler {
    my $r = shift;
    &Apache::loncommon::content_type($r,'text/html');
    $r->send_http_header;
    return OK if $r->header_only;

    my $target=$env{'form.grade_target'};
# --------------------------------------------------- Get course info from URL
    my (undef,undef,$cdom,$cnum)=split(/\//,$r->uri);
# ------------------------------------------------------------ Get query string
    &Apache::loncommon::get_unprocessed_cgi
                        ($ENV{'QUERY_STRING'},['register','forceedit','todocs',
                                               'folderpath','title','only_body']);
# ----------------------------------------------------- Is this even a course?
    my $homeserver=&Apache::lonnet::homeserver($cnum,$cdom);
    if ($homeserver eq 'no_host') {
        &Apache::loncommon::content_type($r,'text/html');
        $r->send_http_header;
        &Apache::loncommon::simple_error_page($r,'No syllabus available',
                          'No syllabus available');
        return OK;
    } elsif (!&Apache::lonnet::is_course($cdom,$cnum)) {
        &Apache::loncommon::content_type($r,'text/html');
        $r->send_http_header;
        &Apache::loncommon::simple_error_page($r,'No syllabus available',
                          'The course/community for which the syllabus was requested does not exist.');
        return OK;
    }
# ------------------------------------- There is such a course, get environment
    my %courseenv=&Apache::lonnet::dump('environment',$cdom,$cnum);
    my $crstype = &Apache::loncommon::course_type();

# --------------------------------------------------------------- Force Student
    my ($forceedit,$forcestudent);
    if ($env{'form.forceedit'}) { $forceedit=1; }
    if (!$forceedit) {
        $forcestudent=1;
    }

# --------------------------------------------------------------- Check Privileges
    my $allowed = 0;
    if ($env{'user.environment'}) {
# does this user have privileges to post, etc?
        if ($env{'request.course.id'}
        && $cdom eq $env{'course.'.$env{'request.course.id'}.'.domain'}
        && $cnum eq $env{'course.'.$env{'request.course.id'}.'.num'}) {
            $allowed=&Apache::lonnet::allowed('mdc',$env{'request.course.id'});
            if ($forcestudent or $target eq 'tex') { $allowed=0; }
        }
    }

# -------------------------------------------------- Let's see who handles this
    my $external=$courseenv{'externalsyllabus'};
    my $uploaded=$courseenv{'uploadedsyllabus'};
    my $minimal=$courseenv{'minimalsyllabus'};

    if (($minimal =~/\w/) || ($uploaded =~/\w/)) {
        my ($item,$is_pdf);
        if ($minimal =~/\w/) {
            if ($external =~ m{\Q$minimal\E$}) {
                undef($external);
            }
            $item = $minimal;
        } elsif ($uploaded =~/\w/) {
            if ($external =~ m{\Q$uploaded\E$}) {
                undef($external);
            }
            $item = $uploaded;
            if ($item =~ /\.pdf$/i) {
                $is_pdf = 1;
            }
        }
        unless ($allowed && $forceedit) {
            my $file=&Apache::lonnet::filelocation("",$item);
            if ($file =~ /\.(tex|x?html?)$/) {
                my $filetype = $1;
                my $filecontents=&Apache::lonnet::getfile($file);
                if ($filecontents eq -1) {
                    $r->print(&mt('Syllabus file unavailable'));
                } elsif ($filetype eq 'tex') {
                    if ($target eq 'tex') {
                        $r->print($filecontents);
                    } else {
                        my $texengine = $env{'form.texengine'};
                        if ($texengine eq '') {
                            $texengine = 'tth';
                        } elsif (lc($texengine) eq 'jsmath') {
                            $texengine = 'MathJax';
                        }
                        my $result = &Apache::lontexconvert::converted(\$filecontents,$texengine);
                        my %args;
                        &get_breadcrumbs($cdom,$cnum,$crstype,\%args);
                        if ($env{'form.only_body'}) {
                            $args{'only_body'} = 1;
                        }
                        if ($env{'request.use_absolute'}) {
                            $args{'use_absolute'} = $env{'request.use_absolute'};
                        }
                        $r->print(&Apache::loncommon::start_page("Syllabus",undef,\%args).
                                  $result.
                                  &Apache::loncommon::end_page());
                    }
                } else {
                    my %mystyle;
                    unless ($target eq 'tex') {
                        $target = 'web';
                    }
                    &Apache::structuretags::reset_problem_globals();
                    my $oldfile = $env{'request.filename'};
                    $env{'request.filename'} = $item;
                    my $result = &Apache::lonxml::xmlparse($r,$target,$filecontents,
                                                           '',%mystyle);
                    &Apache::structuretags::reset_problem_globals();
                    &Apache::lonhomework::finished_parsing();
                    $env{'request.filename'} = $oldfile;
                    &Apache::lonxml::add_messages(\$result);
                    $r->print($result);
                }
            } else {
                if ($target eq 'tex') {
                    $r->print(&Apache::lonprintout::print_latex_header($env{'form.latex_type'}).
                              ' \strut \\\\ \textbf{'.&mt('Syllabus').'} \strut \\\\ '.
                              &mt('Unsupported file type.').' \strut \\\\ '.
                              &mt('Print the syllabus directly from your web browser').
                              '\end{document}');
                } else {
                    my $brcrum;
                    if ($env{'form.folderpath'} =~ /^supplemental/) {
                        my $title = $env{'form.title'};
                        if ($title eq '') {
                            $title = &mt('Syllabus');
                        }
                        $brcrum =
                            &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
                    }
                    $r->print(&Apache::lonwrapper::wrapper($r,$item,$brcrum,$env{'request.use_absolute'},
                                                           undef,$is_pdf,undef,'','',&mt('Syllabus')));
                }
            }
            return OK;
        }
    } elsif ($external=~/\w/) {
        unless ($allowed && $forceedit) {
            if (($env{'user.name'} eq 'public') && ($env{'user.domain'} eq 'public') &&
                ($ENV{'SERVER_PORT'} == 443) && ($external =~ m{^http://}) && !($env{'form.usehttp'})) {
                unless (&Apache::lonnet::uses_sts()) {
                    &redirect_to_http($r);
                    return OK;
                }
            }
            if ($target eq 'tex') {
                $r->print(&Apache::lonprintout::print_latex_header($env{'form.latex_type'}).
                         ' \strut \\\\ \textbf{'.&mt('Syllabus').'} \strut \\\\ '.$external.' '.
                         ' \strut \\\\ '.&mt('Print the syllabus directly from your web browser').
                         '\end{document}');
            } else {
                my $is_ext = 1;
                my ($is_pdf,$brcrum);
                if ($external =~ /\.pdf$/i) {
                    $is_pdf = 1;
                }
                if ($env{'form.folderpath'} =~ /^supplemental/) {
                    my $title = $env{'form.title'};
                    if ($title eq '') {
                        $title = &mt('Syllabus');
                    }
                    $brcrum =
                        &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
                }
                $r->print(&Apache::lonwrapper::wrapper($r,$external,$brcrum,$env{'request.use_absolute'},
                                                       $is_ext,$is_pdf,undef,'','',&mt('Syllabus')));
            }
            return OK;
        }
    }

# ------------------------------------------------------------ Print the screen

    if ($target eq 'tex') {
        $r->print(&Apache::lonprintout::print_latex_header($env{'form.latex_type'}));
    }

# ------------------------------ The buck stops here: internal syllabus display
# --------------------------------------------------------- The syllabus fields
    my %syllabusfields=&Apache::lonlocal::texthash(
       'aaa_instructorinfo' => 'Instructor Information',
       'bbb_description'    => 'Course Description',
       'ccc_prereq'         => 'Prerequisites',
       'cdc_classhours'     => 'Class Hours',
       'ddd_officehours'    => 'Office Hours',
       'eee_helproom'       => 'Helproom Hours',
       'efe_projectinfo'    => 'Project Information',
       'fff_examinfo'       => 'Exam Information',
       'fgf_deadlines'      => 'Deadlines',
       'ggg_grading'        => 'Grading Information',
       'hhh_readings'       => 'Readings',
       'iii_coursepack'     => 'Coursepack',
       'jjj_weblinks'       => 'Web Links',
       'kkk_textbook'       => 'Textbook',
       'lll_includeurl'     => 'URLs To Include in Syllabus');
# ---------------------------------------------------------- Load syllabus info
    my %syllabus=&Apache::lonnet::dump('syllabus',$cdom,$cnum);
    my ($output,%displayfields,%noshow);

# This handler might be called anonymously ...
# ----------------------------------------------------- Only if not public call
    if ($allowed) {
        if (($env{'form.choice'} =~ /^(template|minimal|url|file)$/) ||
            ($env{'form.phase'} =~ /^(upload|check)_embedded$/)) {
            my $earlyout;
            ($earlyout,$uploaded,$external,$minimal,$output) =
                &save_changes($cnum,$cdom,$uploaded,$external,$minimal,
                              \%syllabus,\%syllabusfields,\%courseenv);
            if (($env{'form.choice'} eq 'minimal') && 
                ($minimal eq "/uploaded/$cdom/$cnum/portfolio/syllabus/loncapa.html")) { 
                delete($env{'form.symb'});
                delete($env{'request.symb'});
                $r->internal_redirect("$minimal?editmode=1&forceedit=1");
                return OK;
            }
            if ($earlyout) {
                if ($target ne 'tex') {
                    &print_header($r,$cnum,$cdom,$crstype,$allowed,$forceedit,
                                  \%syllabus,\%syllabusfields);
                    $r->print($output.
                              &Apache::loncommon::end_page());
                }
                return OK;
            }
        }
    }
    if ($target ne 'tex') {
        &print_header($r,$cnum,$cdom,$crstype,$allowed,$forceedit,\%syllabus,
                      \%syllabusfields);
        $r->print($output);
    }

# -------------------------------------------- Determine which fields are shown 

    if ($syllabus{'uploaded.fields'}) {
        if ($syllabus{'uploaded.fields'} eq 'none') {
            foreach my $field (keys(%syllabusfields)) {
                $displayfields{$field} = ' style="display:none;"';
                $noshow{$field} = 1;
            }
        } else {
            my %included;
            map { $included{$_} = 1; } split(/,/,$syllabus{'uploaded.fields'});
            foreach my $field (keys(%syllabusfields)) {
                my ($prefix) = split(/_/,$field);
                if ($included{$prefix}) {
                    $displayfields{$field} = ' style="display:block;"';
                } else {
                    $displayfields{$field} = ' style="display:none;"';
                    $noshow{$field} = 1;
                }
            }
        }
    } else {
        foreach my $field (keys(%syllabusfields)) {
            if ($syllabus{$field} ne '') {
                $displayfields{$field} = ' style="display:block;"';
            } else {
                $displayfields{$field} = ' style="display:none;"';
            }
        }
    }

    if ($allowed) {
#---------------------------------- Print External URL Syllabus Info if editing
        if ($target ne 'tex') {
            my $hostname = &Apache::lonnet::hostname($homeserver);
            my $protocol = $Apache::lonnet::protocol{$homeserver};
            $protocol = 'http' if ($protocol ne 'https');
            my $link = $protocol.'://'.$hostname.$r->uri;
            $r->print('<div class="LC_left_float">'
                     .'<span class="LC_help_open_topic LC_info">'
                     .'<span class="LC_info">'
                     .&mt('Public link (no log-in): [_1]','<tt>'.$link.'</tt>')
                     .'&nbsp;</span>'.&Apache::loncommon::help_open_topic('Syllabus_ExtLink')
                     .'</span>'
                     .'</div><div style="padding:0;clear:both;margin:0;border:0"></div>'."\n");
            my $lonhost = $r->dir_config('lonHostID');
            $r->print(&chooser($external,$uploaded,$minimal,$cdom,$cnum,$lonhost,
                               \%syllabusfields,\%syllabus));
        }
    } else {
#--------------------------------------------- Print last update unless editing
        my $lastmod=$syllabus{'uploaded.lastmodified'};
        $lastmod=($lastmod?&Apache::lonlocal::locallocaltime($lastmod):&mt('never'));
        my $who;
        if ($syllabus{'uploaded.lastmodified'}) {
            if (($env{'user.name'} ne 'public') && ($env{'user.domain'} ne 'public')) {
                $who = &Apache::loncommon::aboutmewrapper(
                       &Apache::loncommon::plainname($syllabus{'uploaded.name'},
                       $syllabus{'uploaded.domain'}),$syllabus{'uploaded.name'},
                       $syllabus{'uploaded.domain'});
            } else {
# Public user?
# Only display name of user, but no link to personal information page
                $who = &Apache::loncommon::plainname(
                           $syllabus{'uploaded.name'},
                           $syllabus{'uploaded.domain'});
            }
        }
        if ($target ne 'tex') {
            $r->print('<div class="LC_info">'.&mt('Last updated').': '.
                      $lastmod . ' '.
                      ($who ? &mt('by').' '.$who
                           : '' ) .
                      '</div>' );
        } else {
            $r->print('\\\\ '.&mt('Last updated').': '.$lastmod.' '.
                     ($who? &mt('by').'\\\\ '.
                     &Apache::loncommon::plainname($syllabus{'uploaded.name'},$syllabus{'uploaded.domain'})
                     :'')
                    .'\\\\');
        }
    }

#-------------------------------------------------------------- Print Headtitle
    if ($target ne 'tex') {
        my $display = 'block';
        if ($external || $uploaded || $minimal) {
            $display = 'none';
        }
        $r->print('<div class="LC_Box" id="template" style="display: '.$display.'">'.
                   '<h2 class="LC_hcell">'.$courseenv{'description'}.'</h2>');
        if ($allowed) {
            $r->print('<div style="margin: 0; float:left;">'.
                      '<h3>'.&Apache::lonnet::domain($cdom,'description').'</h3>'.
                      '</div>');
# Print Help Text if editing at right side of screen
            $r->print('<div style="margin: 0; float:right;">'.
                      &Apache::loncommon::help_open_topic('Uploaded_Templates_TextBoxes',&mt('Help with filling in text boxes')).
                      '</div><br clear="all" />');
        } else {
            $r->print('<h3>'.&Apache::lonnet::domain($cdom,'description').'</h3>');
        }
    } else {
        $r->print('\noindent{\large\textbf{'.$courseenv{'description'}.'}}\\\\\\\\\textbf{'.
        &Apache::lonnet::domain($cdom,'description').'}\\\\');
    }
# -------------------------------------------------------- Get course personnel
    my $hidepersonnel;
    if (($syllabus{'uploaded.fields'}) &&
        (($syllabus{'uploaded.fields'} eq 'none') ||
         ($syllabus{'uploaded.fields'} !~ /000/))) {
        $hidepersonnel = 1;
    }
    if ($target ne 'tex') {
        if ($allowed) {
            my $display = ' style="display:block;"';
            if ($hidepersonnel) {
                $display = ' style="display:none;"';
            }
            &Apache::lontemplate::print_start_template($r,&mt('Personnel'),'LC_Box',
                                                       'box_000_showpeople',$display);
            $r->print(&get_personnel($r,$target,$cdom,$cnum,$allowed,$crstype,\%syllabus));
            &Apache::lontemplate::print_end_template($r);
        } else {
            unless ($hidepersonnel) {
                &Apache::lontemplate::print_start_template($r,&mt('Personnel'),'LC_Box');
                $r->print(&get_personnel($r,$target,$cdom,$cnum,$allowed,$crstype,\%syllabus));  
                &Apache::lontemplate::print_end_template($r);
            }
        }
    } else {
        unless ($hidepersonnel) {
            $r->print(&get_personnel($r,$target,$cdom,$cnum,$allowed,$crstype,%syllabus));
        }
    }
# -------------------------------------------------------------- Announcements?
    my $day = &Apache::lonannounce::showday(time,2,
             &Apache::lonannounce::readcalendar($cdom.'_'.$cnum));
    my $hidefeeds;
    if (($syllabus{'uploaded.fields'}) &&
        (($syllabus{'uploaded.fields'} eq 'none') ||
         ($syllabus{'uploaded.fields'} !~ /111/))) {
        $hidefeeds = 1;
    }
    if ($target ne 'tex') {
        if ($allowed) {
            my $display = ' style="display:block;"';
            if ($hidefeeds) {
                $display = ' style="display:none;"';
            }
            &Apache::lontemplate::print_start_template($r,&mt('RSS Feeds and Blogs'),'LC_Box',
                                                       'box_111_showrssfeeds',$display);
            my ($numfeeds,$hiddenfeeds,$rsslinktext);
            my $feeds=&Apache::lonrss::advertisefeeds($cnum,$cdom,$forceedit,\$numfeeds,
                                                      \$hiddenfeeds);
            if ($numfeeds) {
                $r->print($feeds);
                $rsslinktext = &mt('New RSS Feed or Blog');
            } else {
                my $msg = '<br />'.
                          &mt("RSS Feeds and Blogs item is not included in a student's view of the syllabus.");
                if ($hiddenfeeds) {
                    $r->print('<p class="LC_info">'.
                              &mt('All feeds currently hidden').
                              $msg.
                              '</p>');
                } else {
                    $r->print('<p class="LC_info">'.
                              &mt('No current feeds').
                              $msg.
                              '</p>');
                }
                $rsslinktext = &mt('Manage Course RSS Feeds/Blogs');
                if ($crstype eq 'Community') {
                    $rsslinktext = &mt('Manage Community RSS Feeds/Blogs');
                }
            }
            my $editurl= &Apache::lonnet::absolute_url().'/adm/'.$cdom.'/'.$cnum.'/_rss.html';
            $r->print( '<a href="'.$editurl.'">'.$rsslinktext.'</a>');
            &Apache::lontemplate::print_end_template($r);
        } else {
            unless ($hidefeeds) {
                my $feeds = &Apache::lonrss::advertisefeeds($cnum,$cdom,$forceedit);
                if ($feeds ne '') {
                    &Apache::lontemplate::print_start_template($r,&mt('RSS Feeds and Blogs'),'LC_Box');
                    $r->print($feeds);
                    &Apache::lontemplate::print_end_template($r);
                }
            }
        }
    } else {
        $r->print(&Apache::lonxml::xmlparse($r,'tex',$day));
    }
# ---------------------------------------------------------------- Get syllabus
    if (($syllabus{'uploaded.lastmodified'}) || ($allowed)) {
		my $url_include_handler = sub {
			my ($r, $field, $message, $group, $data_ref, $fields_ref, $target, $allowed, $display) = @_;
			my %data = %{$data_ref};
			my %fields = %{$fields_ref};
			my $urls=$message;
			$message='';
			foreach my $filelink (split(/\n/,$urls)) {
				my $output='';
			   # embed style?
				my ($curfext)=($filelink=~/\.([^\.]+)$/);
				my $embstyle=&Apache::loncommon::fileembstyle($curfext);
				if (($embstyle eq 'ssi') || ($curfext=~/\/$/)) {# make ssi call and remove everything but the body contents
					$output=&Apache::lonnet::ssi_body($filelink);
				} elsif ($embstyle eq 'img') {# embed as an image
					$output='<img src="'.$filelink.'" />';
				}
				if ($output ne '') {
					   if ($target ne 'tex') {
						   $message.='<p>'.$output.'</p>';
					   } else {
						   $message.=' '.&Apache::lonxml::xmlparse($r,'tex','<p>'.$output.'</p>').' ';
					   }
				}
			}
			if ($allowed) {
				 &Apache::lonfeedback::newline_to_br(\$urls);
				 &Apache::lontemplate::print_start_template($r,$fields{$field}.
						  &Apache::loncommon::help_open_topic('Syllabus_URLs'),'LC_Box',
                                                  'box_'.$field,$display);
				 $r->print($urls);
				 $r->print("<br /><div>");
				 &Apache::lontemplate::print_textarea_template($r, $data{$field},
					$field, Apache::lontemplate->RICH_TEXT_ALWAYS_OFF);
				 &Apache::lontemplate::print_saveall_template($r);                         
				 $r->print("</div>");
				 &Apache::lontemplate::print_end_template($r);

			} else {
				$r->print($message);
			}
		};
		my %custom_hash = ( 'lll_includeurl' => $url_include_handler );
		&Apache::lontemplate::print_template_fields($r, \%syllabus, \%syllabusfields, 
			$target, $allowed, Apache::lontemplate->RICH_TEXT_DETECT_HTML, \%custom_hash,
                        undef,\%displayfields,\%noshow);
        if ($allowed) {
            $r->print('</div></form>'.
            &Apache::lonhtmlcommon::htmlareaselectactive());
        }
    } else {
        if ($target ne 'tex') {$r->print('<p class="LC_info">');} else {$r->print('\par ');}
        $r->print(&mt('No syllabus information provided.'));
        if ($target ne 'tex') {$r->print('</p>');}
    }
    if ($target ne 'tex') {
        if ($env{'form.backto'} eq 'coursecatalog') {
            $r->print('<form name="backtocat" method="post" action="/adm/coursecatalog">'.
                      &Apache::lonhtmlcommon::echo_form_input(['backto','courseid']).
                      '</form>');
        }
        $r->print(&Apache::loncommon::end_page());
    } else {
        $r->print('\end{document}');
    }
    return OK;
}

sub print_header {
    my ($r,$cnum,$cdom,$crstype,$allowed,$forceedit,$syllabus,$syllabusfields) = @_;
    return unless ((ref($syllabus) eq 'HASH') || (ref($syllabusfields) eq 'HASH'));
# ----------------------------------------------------------------- Make header
    my $rss_link = &Apache::lonrss::rss_link($cnum,$cdom);
    my $js;
    if ($env{'form.backto'} eq 'coursecatalog') {
        $js .= <<"ENDSCRIPT";

<script type="text/javascript">
// <![CDATA[

function ToCatalog(caller) {
    numidx = getIndexByName('coursenum');
        if (numidx > -1) {
            if (caller != 'details') {
                document.backtocat.elements[numidx].value = '';
            }
        }
    document.backtocat.submit();
}

function getIndexByName(item) {
    for (var i=0;i<document.backtocat.elements.length;i++) {
        if (document.backtocat.elements[i].name == item) {
            return i;
        }
    }
    return -1;
}

// ]]>
</script>

ENDSCRIPT
    }
    if ($allowed && $forceedit) {
        my $check_uncheck = &Apache::loncommon::check_uncheck_jscript();
        my @fieldnames = sort(keys(%{$syllabusfields}));
        unshift(@fieldnames,'000_showpeople','111_showrssfeeds');
        my (@checked,@unchecked);
        if ($syllabus->{'uploaded.fields'} eq 'none') {
            my $lastidx = scalar(@fieldnames)-1;
            @unchecked = (0..$lastidx);
        } elsif ($syllabus->{'uploaded.fields'}) {
            my %included;
            map { $included{$_} = 1; } split(/,/,$syllabus->{'uploaded.fields'});
            for (my $i=0; $i<@fieldnames; $i++) {
                my ($prefix) = split(/_/,$fieldnames[$i]);
                if ($included{$prefix}) {
                    push(@checked,$i);
                } else {
                    push(@unchecked,$i);
                }
            }
        } else {
            @checked = (0,1);
            for (my $i=2; $i<@fieldnames; $i++) {
                if ($syllabus->{$fieldnames[$i]}) {
                    push(@checked,$i);
                } else {
                    push(@unchecked,$i);
                }
            }
        }
        my $fieldstr = "var fields = new Array('".join("','",@fieldnames)."');";
        my $checkedstr = "var include = new Array('".join("','",@checked)."');";
        my $uncheckedstr = "var exclude = new Array('".join("','",@unchecked)."');";
        my $invurl = &mt('Invalid URL');
        &js_escape(\$invurl);
        my $urlregexp = <<'ENDREGEXP';
/^([a-z]([a-z]|\d|\+|-|\.)*):(\/\/(((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:)*@)?((\[(|(v[\da-f]{1,}\.(([a-z]|\d|-|\.|_|~)|[!\$&'\(\)\*\+,;=]|:)+))\])|((\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])\.(\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]))|(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=])*)(:\d*)?)(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*|(\/((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)?)|((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)+(\/(([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)*)*)|((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)){0})(\?((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|[\uE000-\uF8FF]|\/|\?)*)?(\#((([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(%[\da-f]{2})|[!\$&'\(\)\*\+,;=]|:|@)|\/|\?)*)?$/i
ENDREGEXP

        $js .= <<"ENDSCRIPT";

<script type="text/javascript">
// <![CDATA[

function toggleEditor(pick) {
    var choices = new Array('template','minimal','url','file','templatebox');
    for (var i=0; i<choices.length; i++) {
        if (((choices[i] == 'templatebox') && (pick == 'template')) ||
            (choices[i] == pick)) {
            document.getElementById(choices[i]).style.display='block';
        } else {
            document.getElementById(choices[i]).style.display='none';
        }
    }
    return;
}

var regexp = $urlregexp;

function extUrlPreview(caller,protocol) {
    if (document.getElementById(caller)) {
        var url = document.getElementById(caller).value;
        if (regexp.test(url)) {
            var http_regex = /^http\:\/\//gi;
            if ((protocol == 'https') && (http_regex.test(url))) {
                window.open(url,"syllabuspreview","height=400,width=500,scrollbars=1,resizable=1,menubar=0,location=1");
            } else {
                openMyModal(url,500,400,'yes');
            }
        } else {
            alert("$invurl");
        }
    }
}

function toggleBox(name,caller) {
    if (name == 'all') {
        if (document.syllabus.showfield.length > 0) {
            for (var i=0; i<document.syllabus.showfield.length; i++) {
                if (document.syllabus.showfield[i].checked) {
                    if (document.getElementById('box_'+document.syllabus.showfield[i].value)) {
                        document.getElementById('box_'+document.syllabus.showfield[i].value).style.display='block';
                    }
                } else {
                    if (document.getElementById('box_'+document.syllabus.showfield[i].value)) {
                        document.getElementById('box_'+document.syllabus.showfield[i].value).style.display='none';
                    }
                }
            }
        }
    } else {
        if (caller.checked) {
            if (document.getElementById('box_'+caller.value)) {
                document.getElementById('box_'+caller.value).style.display='block';
            }
        } else {
            if (document.getElementById('box_'+caller.value)) {
                document.getElementById('box_'+caller.value).style.display='none';
            }
        }
    }
    return;
}

function setTemplateBoxes() {
    $fieldstr
    $checkedstr
    $uncheckedstr
    if (include.length > 0) {
        for (var i=0; i<include.length; i++) {
            if (document.getElementById('showfield_'+include[i])) {
                document.getElementById('showfield_'+include[i]).checked = true;
                if (document.getElementById('box_'+fields[include[i]])) {
                    document.getElementById('box_'+fields[include[i]]).style.display='block';
                }
            }
        }
    }
    if (exclude.length > 0) {
        for (var i=0; i<exclude.length; i++) {
            if (document.getElementById('showfield_'+exclude[i])) {
                document.getElementById('showfield_'+exclude[i]).checked = false;
                if (document.getElementById('box_'+fields[exclude[i]])) {
                    document.getElementById('box_'+fields[exclude[i]]).style.display='none';
                }
            }
        }
    }
    return;
}

$check_uncheck

// ]]>
</script>

ENDSCRIPT
    }
    my $args = {'function'       => undef,
                'domain'         => $cdom};
    my $forcereg;
    if ($env{'form.register'}) {
        $forcereg = 1;
        $args->{'force_register'} = $forcereg;
    }
    if ($env{'form.backto'} eq 'coursecatalog') {
        &Apache::lonhtmlcommon::clear_breadcrumbs();
        my $brcrum = [{href=>"javascript:ToCatalog();",
                       text=>&mt('Course/Community Catalog'),
                       no_mt=>1}
                     ];
        if ($env{'form.coursenum'} ne '') {
            push(@{$brcrum},
                  {href=>"javascript:ToCatalog('details')",
                   text=>"Course details"});
        }
        push(@{$brcrum},
              {href=>$r->uri,
               text=>"Course syllabus"});
        $args->{'bread_crumbs'} = $brcrum;
    } else {
        &get_breadcrumbs($cdom,$cnum,$crstype,$args);
    }
    if ($allowed) {
        my %loaditem = (
                         onload => 'setTemplateBoxes();',
                       );
        $args->{'add_entries'} = \%loaditem;
    } else {
        if ($env{'request.use_absolute'}) {
            $args->{'use_absolute'} = $env{'request.use_absolute'};
        }
    }
    if ($env{'form.only_body'}) {
        $args->{'only_body'} = 1;
    }
    $args->{'hostname'} = $r->hostname();
    my $start_page =
        &Apache::loncommon::start_page("Syllabus", $rss_link.$js,$args);
    if ($start_page) {
        $r->print($start_page);
    }
}

sub get_breadcrumbs{
    my ($cdom,$cnum,$crstype,$args) = @_;
    return unless (ref($args) eq 'HASH');
    if ($env{'form.folderpath'} =~ /^supplemental/) {
        my $title = $env{'form.title'};
        if ($title eq '') {
            $title = &mt('Syllabus');
        }
        my $brcrum =
            &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
        if (ref($brcrum) eq 'ARRAY') {
            $args->{'bread_crumbs'} = $brcrum;
        }
    } else {
        if ((&Apache::lonnet::is_on_map("public/$cdom/$cnum/syllabus"))
                 && (($env{'form.symb'}) || ($env{'form.register'}))) {
            &Apache::lonhtmlcommon::clear_breadcrumbs();
        } else {
            $args->{'bread_crumbs'} = [
                                        {'href' => "/public/$cdom/$cnum/syllabus",
                                         'text' => 'Syllabus'},
                                      ];
        }
    }
    return;
}

sub chooser {
    my ($external,$uploaded,$minimal,$cdom,$cnum,$lonhost,$fields,$values) = @_;
    my %lt = &Apache::lonlocal::texthash(
                 'type'          => 'Syllabus Type',
                 'url'           => 'External URL',
                 'file'          => 'Uploaded file',
                 'minimal'       => 'Minimal template',
                 'template'      => 'Standard template',
                 'templateboxes' => 'Choose template items ... ',
                 'curr'          => 'Current:',
                 'rep'           => 'Replace:',
                 'upl'           => 'Upload:',
                 'pr'            => 'Preview',
                 'save'          => 'Save',
                 'sved'          => 'Save and Edit',
                 'chourl'        => 'External URL',
                 'chofile'       => 'Uploaded syllabus file',
                 'parse'         => 'Upload embedded images/multimedia files if HTML file',
    );
    my %checked = (
                    file     => '',
                    minimal  => '',
                    url      => '',
                    template => '',
                  );
    my %display = (
                    file        => 'none',
                    minimal     => 'none',
                    url         => 'none',
                    templatebox => 'none',
                  );
    my $check = ' checked="checked" ';
    if ($uploaded) {
        $checked{'file'} = $check;
        $display{'file'} = 'block';
    } elsif ($external) {
        $checked{'url'}  = $check;
        $display{'url'} = 'block';
    } elsif ($minimal) {
        $checked{'minimal'} = $check;
        $display{'minimal'} = 'block';
    } else {
        $checked{'template'} = $check;
        $checked{'templatebox'} = $check;
        $display{'templatebox'} = 'block';
    }
    my $protocol = ($ENV{'SERVER_PORT'} == 443?'https':'http');

    my $output = 
        '<form name="syllabus" method="post" enctype="multipart/form-data" action="">'."\n".
        '<input type="hidden" name="forceedit" value="1" />'."\n".
        '<div class="LC_left_float"><fieldset><legend>'.$lt{'type'}.'</legend>';
    foreach my $item ('minimal','template','url','file') {
        $output .= '<label><input type="radio" name="choice" value="'.$item.'" '.$checked{$item}.' onclick="toggleEditor('."'$item'".')" />'.
                   $lt{$item}.'</label><br />';
    }
    $output .= '</fieldset></div>'."\n".
               '<div id="url" class="LC_left_float" style="display: '.$display{'url'}.'">'."\n".
               '<fieldset><legend>'.$lt{'chourl'}.'</legend><span class="LC_nobreak">'."\n".
               '<a href="javascript:extUrlPreview('."'syllabusurl','$protocol'".');">'.$lt{'pr'}.'</a></span>&nbsp;'."\n".
               '<input type="text" id="syllabusurl" name="externalsyllabus" value="'.$external.'" size="55" />'."\n".
               '&nbsp;<input type="submit" name="storeurl" value="'.$lt{'save'}.'" />'."\n".
               '</fieldset></div>'."\n".
               '<div id="minimal" class="LC_left_float" style="display: '.$display{'minimal'}.'">'."\n".
               '<fieldset><legend>'.$lt{'minimal'}.'</legend>';
    if ($minimal) {
        my ($absurl,$filename,$depbutton) = &syllabus_file_info($minimal,$cnum,$cdom,$lonhost,'minimal');
        $output .= '<a href="javascript:extUrlPreview('."'currminimal'".');">'.$lt{'pr'}.'</a>'.
                   '<input type="hidden" name="minimalfile" value="'.&HTML::Entities::encode($absurl).'?inhibitmenu=yes" id="currminimal" />'.
                   $depbutton;
    } else {
        $output .= &mt('Title of Syllabus Page:').'&nbsp;'.
                   '<input type="text" id="minimaltitle" name="syllabustitle" value="'.&mt('Syllabus').'" size="30" />'."\n".
                   '&nbsp;<input type="submit" name="storeminimal" value="'.$lt{'sved'}.'" />'."\n";
    }
    $output .= '</fieldset></div>'."\n".
               '<div id="file" class="LC_left_float" style="display: '.$display{'file'}.'">'."\n".
               '<fieldset><legend>'.$lt{'file'}.'</legend>';
    if ($uploaded) {
        my ($absurl,$filename,$depbutton) = &syllabus_file_info($uploaded,$cnum,$cdom,$lonhost,'file');
        $output .= '<span class="LC_nobreak">'.$lt{'curr'}.'&nbsp;'.
                   '<input type="hidden" name="uploadedfile" value="'.&HTML::Entities::encode($absurl).'?inhibitmenu=yes" id="currfile" />'.
                   '<a href="javascript:extUrlPreview('."'currfile'".');">'.$filename.'</a></span>'.$depbutton.
                   '<br /><br />'.$lt{'rep'};
    } else {
        $output .= $lt{'upl'};
    }
    $output .= '<br />'."\n".
               '<span class="LC_nobreak">'.
               '<input type="file" name="syllabusfile" size="55" />'."\n".
               '&nbsp;<input type="submit" name="storefile" value="'.$lt{'save'}.'" />'.
               '</span><br />'.
               '<label>'.
               '<input type="checkbox" name="parserflag" checked="checked" />'.
               $lt{'parse'}.
               '</label>'.
               '</fieldset></div>'.
               '<div id="templatebox" class="LC_left_float" style="display: '.
               $display{'templatebox'}.';"><fieldset><legend>'.$lt{'templateboxes'}.
               '&nbsp;<input type="button" value="'.&mt('check all').'" '.
               'onclick="javascript:checkAll('."document.syllabus.showfield".');javascript:toggleBox('."'all'".');" />'.
               ('&nbsp;'x2).
               '<input type="button" value="'.&mt('uncheck all').'" '.
               'onclick="javascript:uncheckAll('."document.syllabus.showfield".');javascript:toggleBox('."'all'".');" />'.
               '</legend>'.
               &fields_check_uncheck($fields,$values).
               '</fieldset><br />'.
               '<input type="submit" name="storesyl" value="'.&mt('Save All').'" />'.
               '</div>';
    $output .= '<div style="padding:0;clear:both;margin:0;border:0"></div>';
    return $output;
}

sub syllabus_file_info {
    my ($item,$cnum,$cdom,$lonhost,$context) = @_;
    my $hostname = &Apache::lonnet::hostname($lonhost);
    my $protocol = $Apache::lonnet::protocol{$lonhost};
    $protocol = 'http' if ($protocol ne 'https');
    my $absurl = $protocol.'://'.$hostname.$item;
    my ($filename) = ($item =~ m{([^/]+)$});
    my $file=&Apache::lonnet::filelocation("",$item);
    my ($depbutton,$filetype,$editable);
    if ($file =~ /\.(xhtml|xml|tex|html|htm)$/) {
        $filetype=$1;
    }
    if ($filetype) {
        unless ($filetype eq 'tex') {
            $filetype='html';
        }
    }
    if ($filetype eq 'html') {
        my $filecontents=&Apache::lonnet::getfile($file);
        unless ($filecontents eq -1) {
            my $mm = new File::MMagic;
            my $mimetype = $mm->checktype_contents($filecontents);
            if ($mimetype eq 'text/html') {
                my (%codebase,%allfiles);
                my $parse_result = &Apache::lonnet::extract_embedded_items($item,\%allfiles,
                                                                           \%codebase,\$filecontents);
                my $actionurl = "/public/$cdom/$cnum/syllabus";
                my ($ignore,$num,$numpathchanges,$existing,$mapping) =
                    &Apache::loncommon::ask_for_embedded_content($actionurl,undef,\%allfiles,
                                                                 \%codebase,
                                                                 {'context' => 'rewrites',
                                                                  'ignore_remote_references' => 1,});
                $editable = 1;
            }
        }
    }
    $depbutton = ('&nbsp;' x 3).
                 &editfile_button($item,$context,$editable).
                 &editbutton_js();
    return ($absurl,$filename,$depbutton);
}

sub fields_check_uncheck {
    my ($fields,$values) = @_;
    return unless ((ref($fields) eq 'HASH') && (ref($values) eq 'HASH'));
    my $numinrow = 4;
    my $table;
    my @fieldnames = sort(keys(%{$fields}));
    unshift(@fieldnames,'000_showpeople','111_showrssfeeds'); 
    my $numfields = scalar(@fieldnames);
    my %included;
    if (($values->{'uploaded.fields'}) && ($values->{'uploaded.fields'} ne 'none')) {
        map { $included{$_} = 1; } split(/,/,$values->{'uploaded.fields'});
    }
    for (my $i=0; $i<$numfields; $i++) {
        my ($name,$checked);
        if ($fieldnames[$i] eq '000_showpeople') {
            $name = &mt('Personnel');
        } elsif ($fieldnames[$i] eq '111_showrssfeeds') {
            $name = &mt('RSS Feeds and Blogs');
        } else {
            $name = $fields->{$fieldnames[$i]};
        }
        if ($values->{'uploaded.fields'}) {
            unless ($values->{'uploaded.fields'} eq 'none') {
                my ($prefix) = split(/_/,$fieldnames[$i]);
                if ($included{$prefix}) {
                    $checked = ' checked="checked"';
                }
            }
        } else {
            if ($fieldnames[$i] eq '000_showpeople') {
                $checked = ' checked="checked"';
            } elsif ($fieldnames[$i] eq '111_showrssfeeds') {
                $checked = ' checked="checked"';
            } else {
                if ($values->{$fieldnames[$i]} ne '') {
                    $checked = ' checked="checked"';
                }
            }
        }
        my $rem = $i%($numinrow);
        if ($rem == 0) {
            if (($i > 0) && ($i < $numfields)) {
                $table .= '</tr>';
            }
            if ($i < $numfields) {
                $table .= '<tr>';
            }
        }
        if ($i == $numfields-1) {
            my $rem = $numfields%($numinrow);
            my $colsleft = $numinrow - $rem;
            if ($colsleft > 1) {
                $table .= '<td colspan="'.$colsleft.'">';
            } else {
                $table .= '</td>';
            }
        } else {
            $table .= '<td>';
        }
        $table .=
            '<label><input type="checkbox" name="showfield" value="'.$fieldnames[$i].'" '.
            $checked.' id="showfield_'.$i.'" onclick="javascript:toggleBox('."'$fieldnames[$i]',this".');" />'.
            $name.'</label></td>'."\n";
    }
    if ($table ne '') {
        my $rem = $numfields%($numinrow);
        my $colsleft = $numinrow - $rem;
        if ($colsleft > 1 ) {
            $table .= '<td colspan="'.$colsleft.'">&nbsp;</td>';
        } elsif ($colsleft == 1) {
            $table .= '<td>&nbsp;</td>';
        }
        $table = '<table>'.$table.'</tr></table>';
    }
    return $table;
}

sub get_personnel {
    my ($r,$target,$cdom,$cnum,$allowed,$crstype,$syllabus) = @_;
    my (%hiddenroles,%hiddenusers);
    if (ref($syllabus) eq 'HASH') {
        if (ref($syllabus->{'personnel'}) eq 'HASH') {
            if ($syllabus->{'personnel'}{'hiderole'}) {
                map { $hiddenroles{$_} = 1; } split(/,/,$syllabus->{'personnel'}{'hiderole'});
            }
            if ($syllabus->{'personnel'}{'hideuser'}) {
                map { $hiddenusers{$_} = 1; } split(/,/,$syllabus->{'personnel'}{'hideuser'});
            }
        }
    }
    my $output;
    my %coursepersonnel=&Apache::lonnet::get_course_adv_roles($cdom.'/'.$cnum,1);
    if ($target ne 'tex') {
        if ($allowed) {
            $r->print(&Apache::loncommon::start_data_table().
                      &Apache::loncommon::start_data_table_header_row().
                      '<th>'.&mt('Role hidden?').'</th><th>'.&mt('Role').'</th>'.
                      '<th>'.&mt('Personnel (hidden if checked)').'</th>'.
                      &Apache::loncommon::end_data_table_header_row());
        } else {
            $r->print(&Apache::lonhtmlcommon::start_pick_box());
        }
    } else {
        $r->print('\begin{tabular}{|p{0.45\textwidth}|p{0.45\textwidth}|}\hline');
    }
    my @personnel=sort(keys(%coursepersonnel));
    my $lastpers=$personnel[$#personnel];
    foreach my $element (@personnel) {
        unless ($allowed) {
            next if ($hiddenroles{$element}) 
        }
        my ($role,$sec);
        if ($element =~ /:/) {
            ($role,$sec) = split(/:/,$element);
        } else {
            $role = $element;
        }
        my $roletext = &Apache::lonnet::plaintext($role,$crstype);
        if ($sec) {
            $roletext .=' ('.&Apache::lonlocal::mt('Section [_1]',$sec).')';
        }
        if ($target ne 'tex') {
            if ($allowed) {
                my $checked;
                if ($hiddenroles{$element}) {
                    $checked = ' checked="checked"';
                }
                $r->print(&Apache::loncommon::start_data_table_row().
                          '<td>'.
                          '<input type="checkbox" name="hiderole" value="'.$element.'" '.
                          $checked.' />'.
                          '</td><td>'.$roletext.'</td><td>');
            } else {
                $r->print(&Apache::lonhtmlcommon::row_title($roletext));
            }
        } else {
            $r->print(' '.&Apache::lonxml::xmlparse($r,'tex',$roletext).' & ');
        }
        my @coursepersonlist;
        foreach my $user (split(/\,/,$coursepersonnel{$element})) {
            my ($puname,$pudom)=split(/\:/,$user);
            if ($target ne 'tex') {
                my $courseperson = &Apache::loncommon::plainname($puname,$pudom);
                my $checked;
                if ($hiddenusers{$element.'&'.$puname.':'.$pudom}) {
                    $checked = ' checked="checked"';
                }
                if ($allowed) {
                    my $item = '<span class="LC_nobreak"><label>'.
                               '<input type="checkbox" name="hideuser" value="'.$element.'&amp;'.$puname.':'.$pudom.'"'.$checked.' />'.
                               &Apache::loncommon::aboutmewrapper($courseperson
,
                                               $puname,$pudom).
                               '</label>'.('&nbsp;'x2).'</span> ';
                    push(@coursepersonlist,$item);

                } else {
                    next if ($hiddenusers{$element.'&'.$puname.':'.$pudom});
                    if (($env{'user.name'} eq '') || ($env{'user.name'} eq 'public') ||
                        ($env{'user.domain'} eq '') || ($env{'user.domain'} eq 'public')) {
                        push(@coursepersonlist,$courseperson);
                    } else {
                        push(@coursepersonlist,&Apache::loncommon::aboutmewrapper($courseperson,
                                               $puname,$pudom));
                    }
                }
            } else {
                push(@coursepersonlist,&Apache::loncommon::plainname($puname,
                              $pudom).' ');
            }
        }
        if ($allowed) {
            $r->print(join('',@coursepersonlist));
        } else {
            $r->print(join(', ',@coursepersonlist));
        }
        if ($target ne 'tex') {
            if ($allowed) {
                $r->print('</td>'.&Apache::loncommon::end_data_table_row());
            } else {
                my $lastclose=$element eq $lastpers?1:0;
                $r->print(&Apache::lonhtmlcommon::row_closure($lastclose));
            }
        } else {
            $r->print('\\\\ \hline');
        }
    }
    if ($target ne 'tex') {
        if ($allowed) {
            $r->print(&Apache::loncommon::end_data_table());
        } else {
            $r->print(&Apache::lonhtmlcommon::end_pick_box());
        }
    } else {
        $r->print('\end{tabular}\\\\');
    }
    return;
}

sub save_changes {
    my ($cnum,$cdom,$uploaded,$external,$minimal,$syllabus,$syllabusfields,$courseenv) = @_;
    my ($earlyout,$output);
    unless ((ref($syllabus) eq 'HASH') && (ref($syllabusfields) eq 'HASH') ||
            (ref($courseenv) eq 'HASH')) {
        return ($earlyout,$uploaded,$external,$minimal,$output);
    }
    my ($was_ext,$is_ext,$putres);
    if ($external) {
        $was_ext = $external;
    }
    if (($env{'form.deleteuploaded_file'}) || ($env{'form.deleteuploaded_minimal'})) {
        my %storehash;
        if (($env{'form.choice'} eq 'file') && 
            ($env{'form.deleteuploaded_file'}) && ($uploaded =~ /\w/)) {
            if ($courseenv->{'uploadedsyllabus'} =~ m{^\Q/uploaded/$cdom/$cnum/portfolio\E(/syllabus/.+)$}) {
                my $filename = $1;
                &update_access_permissions($cdom,$cnum,$filename);
            }
            &Apache::lonnet::delenv('course.'.$env{'request.course.id'}.'.uploadedsyllabus');
            &Apache::lonnet::delenv('course.'.$env{'request.course.id'}.'.externalsyllabus');
            $storehash{'uploadedsyllabus'} = '';
            $storehash{'externalsyllabus'} = '';
            $putres = &Apache::lonnet::put('environment',\%storehash,$cdom,$cnum);
            undef($uploaded);
            undef($external);
        } elsif (($env{'form.choice'} eq 'minimal') &&
                 ($env{'form.deleteuploaded_minimal'}) && ($minimal =~ /\w/)) {
            my $minimalurl = "/uploaded/$cdom/$cnum/portfolio/syllabus/loncapa.html";
            if ($courseenv->{'minimalsyllabus'} eq "$minimalurl") {
                my $filecontents=&Apache::lonnet::getfile(&Apache::lonnet::filelocation("",$minimalurl));
                unless ($filecontents eq -1) {
                    $env{'form.output'} = $filecontents; 
                    &Apache::lonnet::finishuserfileupload($cnum,$cdom,'output',
                                                          'portfolio/syllabus/loncapa.html.bak');
                    $minimalurl = &default_minimal_syllabus($cnum,$cdom);
                }
            }
            &update_access_permissions($cdom,$cnum,'/syllabus/loncapa.html');
            &Apache::lonnet::delenv('course.'.$env{'request.course.id'}.'.externalsyllabus');
            &Apache::lonnet::delenv('course.'.$env{'request.course.id'}.'.minimalsyllabus');
            $storehash{'externalsyllabus'} = '';
            $storehash{'minimalsyllabus'} = '';
            $putres = &Apache::lonnet::put('environment',\%storehash,$cdom,$cnum);
            undef($external);
            undef($minimal);
        }
    } elsif ($env{'form.choice'} eq 'template') {
#store what the user typed in to the template
        my @shown = &Apache::loncommon::get_env_multiple('form.showfield');
        $syllabus->{'uploaded.fields'} = '';
        if (@shown == 0) {
            $syllabus->{'uploaded.fields'} = 'none';
        } else {
            foreach my $field (sort(@shown)) {
                if (($field eq '000_showpeople') ||
                    ($field eq '111_showrssfeeds') ||
                    ($syllabusfields->{$field})) {
                    my ($prefix) = split(/_/,$field);
                    $syllabus->{'uploaded.fields'} .= $prefix.',';
                }
                if ($field eq '000_showpeople') {
                    my @hideusers = &Apache::loncommon::get_env_multiple('form.hideuser');
                    my @hideroles = &Apache::loncommon::get_env_multiple('form.hiderole');
                    my %coursepersonnel=&Apache::lonnet::get_course_adv_roles($cdom.'/'.$cnum,1);
                    my %personnel;
                    foreach my $key (keys(%coursepersonnel)) {
                        map { $personnel{$key}{$_} = 1; } split(/,/,$coursepersonnel{$key});
                    }
                    %{$syllabus->{'personnel'}} = ();
                    $syllabus->{'personnel'}{'hideuser'} = '';
                    $syllabus->{'personnel'}{'hiderole'} = '';
                    foreach my $role (@hideroles) {
                        if (exists($personnel{$role})) {
                            $syllabus->{'personnel'}{'hiderole'} .= $role.',';
                        }
                    }
                    foreach my $item (@hideusers) {
                        my ($role,$user) = split(/\&/,$item);
                        if (ref($personnel{$role}) eq 'HASH') {
                            if ($personnel{$role}{$user}) {
                                $syllabus->{'personnel'}{'hideuser'} .= $item.',';
                            }
                        }
                    }
                    $syllabus->{'personnel'}{'hideuser'} =~ s/,$//;
                    $syllabus->{'personnel'}{'hiderole'} =~ s/,$//;
                }
            }
            $syllabus->{'uploaded.fields'} =~ s/,$//;
        }
        foreach my $syl_field (keys(%{$syllabusfields})) {
            my $field=$env{'form.'.$syl_field};
            chomp($field);
            my $gateway = Apache::lonhtmlgateway->new();
            $field = $gateway->process_incoming_html($field,1);
                            #here it will be stored
            $syllabus->{$syl_field}=$field;
            if ($syl_field eq 'lll_includeurl') { # clean up included URLs
                my $field='';
                foreach my $value (split(/\n/,$syllabus->{$syl_field})) {
                    my $url=$value;
# get rid of leading and trailing spaces
                    $url=~s/^\s+//;
                    $url=~s/\s+$//;
                    if ($url=~m|^https?\://([^/]+)/(.+)$|) {
                        my $host = $1;
                        my $remainder=$2;
# remove the hostname from internal URLs
                        my $hostname = &Apache::lonnet::hostname($host);
                        my %all_hostnames = &Apache::lonnet::all_hostnames();
                        foreach my $possible_host (keys(%all_hostnames)) {
                            if ($possible_host =~ /\Q$hostname\E/i) {
                                $url=$remainder;
                            }
                        }
                    }
# norm internal URLs
                    unless ($url=~/^https?\:/) {
                        $url=&Apache::lonnet::clutter($url);
                    }
# re-assemble field
                    if ($url) {
                        $field.=$url."\n";
                    }
                }
                $syllabus->{$syl_field}=$field;
            }
        }
        my $now = time;
        $syllabus->{'uploaded.domain'}=$env{'user.domain'};
        $syllabus->{'uploaded.name'}=$env{'user.name'};
        $syllabus->{'uploaded.lastmodified'} = $now;
        $putres = &Apache::lonnet::put('syllabus',$syllabus,$cdom,$cnum);
        if ($putres eq 'ok') {
            ($uploaded,$minimal,$external) = 
                &update_syllabus_env($cdom,$cnum,$courseenv,$env{'form.choice'},$uploaded,
                                     $minimal,$external);
            $output = '<div>'.
                      &Apache::lonhtmlcommon::confirm_success(&mt('Template saved.')).
                      '</div>';
        } else {
            $output = '<div class="LC_error">'.
                      &mt('An error occurred storing the template: [_1]',$putres).
                      '</div>';
        }
    } elsif ($env{'form.choice'} eq 'url') {
        if ($env{'form.externalsyllabus'} =~ m{^https?://}) {
            if ($env{'form.externalsyllabus'} eq $external) {
                $output = '<div class="LC_info">'.
                          &mt('External URL unchanged.').
                          '</div>';
                ($uploaded,$minimal,$external) =
                    &update_syllabus_env($cdom,$cnum,$courseenv,$env{'form.choice'},$uploaded,
                                         $minimal,$external);
            } else {
                $external=$env{'form.externalsyllabus'};
                $external =~ s/(`)//g;
                $putres =
                    &Apache::lonnet::put('environment',{externalsyllabus=>$external},
                                         $cdom,$cnum);
                if ($putres eq 'ok') {
                    &Apache::lonnet::appenv({'course.'.$env{'request.course.id'}.'.externalsyllabus' => $external});
                    $output = '<div>'.
                              &Apache::lonhtmlcommon::confirm_success(&mt('External URL saved.')).
                             '</div>';
                    ($uploaded,$minimal,$external) =
                        &update_syllabus_env($cdom,$cnum,$courseenv,$env{'form.choice'},$uploaded,
                                             $minimal,$external);
                } else {
                    $output = '<div class="LC_error">'.
                              &mt('An error occurred storing the external URL: [_1]',$putres).
                              '</div>';
                }
                $is_ext = $external;
            }
        } else {
            $output = '<div class="LC_error">'.
                      &mt('External URL not saved -- invalid URL.').
                      '</div>';
        }
    } elsif (($env{'form.choice'} eq 'file') || ($env{'form.choice'} eq 'minimal')) {
        # Process file upload - phase one - upload and parse primary file.
        my ($upload_result,$uploadphase,$url,$needlink,$error,$errormsg);
        if ($env{'form.choice'} eq 'file') {
            if ($env{'form.syllabusfile.filename'}) {
                my %allfiles = ();
                my %codebase = ();
                ($url,$needlink) = &process_upload(\$output,$cnum,$cdom,
                                                   \%allfiles,\%codebase);
            } else {
                $output = '<div class="LC_info">'.
                          &mt('No file uploaded').
                          '</div>';
            }
        } elsif ($env{'form.choice'} eq 'minimal') {
            $url = "/uploaded/$cdom/$cnum/portfolio/syllabus/loncapa.html";
            my $filecontents=&Apache::lonnet::getfile(&Apache::lonnet::filelocation("",$url));
            if ($filecontents eq -1) {
                $url = &default_minimal_syllabus($cnum,$cdom);
            }
        }
        if ($url =~ m{^/uploaded/\Q$cdom\E/\Q$cnum\E.*/[^/]+$}) {
            my $exturl = &home_http_host($cdom,$cnum);
            if ($exturl) {
                $exturl .= $url;
            }
            my %storehash;
            if ($env{'form.choice'} eq 'minimal') {
                $storehash{'minimalsyllabus'} = $url;
            } else {
                $storehash{'uploadedsyllabus'} = $url;
            }
            if ($exturl) {
                $storehash{'externalsyllabus'} = $exturl;
                if ($exturl =~ /\.(html?|txt|js|css)$/) {
                    $exturl .= '?inhibitmenu=yes';
                }
            } else {
                $storehash{'externalsyllabus'} = '',
            }
            $putres =
                &Apache::lonnet::put('environment',\%storehash,$cdom,$cnum);
            if ($putres eq 'ok') {
                &Apache::lonnet::make_public_indefinitely($url);
                foreach my $key (keys(%storehash)) {
                    &Apache::lonnet::appenv({'course.'.$env{'request.course.id'}.'.'.$key => $storehash{$key}});
                }
                if ($env{'form.choice'} eq 'minimal') {
                    $minimal = $url;
                } else {
                    $uploaded = $url;
                }
                if ($needlink) {
                    $output .= &return_to_editor($cdom,$cnum);
                    $earlyout = 1;
                }
                ($uploaded,$minimal,$external) =
                    &update_syllabus_env($cdom,$cnum,$courseenv,$env{'form.choice'},$uploaded,
                                         $minimal,$external);
            } else {
                $error = 1;
                $errormsg = $putres;
            }
        } else {
            $error = 1;
        }
        if ($error) {
            $output = '<div class="LC_error">';
            if ($env{'form.choice'} eq 'minimal') {
                $output = &mt('An error occurred creating the minimal template file [_1]',$errormsg);
            } else {
                $output = &mt('An error occurred storing the uploaded file [_1]',$errormsg);
            }
            $output .= '</div>';
        }
    } elsif ($env{'form.phase'} eq 'upload_embedded') {
        # Process file upload - phase two - upload embedded objects
        my $uploadphase = 'check_embedded';
        my $primaryurl = &HTML::Entities::encode($env{'form.primaryurl'},'<>&"');
        my $state = &embedded_form_elems($uploadphase,$primaryurl);
        my $url_root = '/uploaded/'.$cdom.'/'.$cnum;
        my $actionurl = "/public/$cdom/$cnum/syllabus";
        my ($result,$flag,$numpathchgs) =
            &Apache::loncommon::upload_embedded('syllabus','portfolio/syllabus',
                $cnum,$cdom,'/userfiles',$url_root,undef,undef,undef,$state,
                $actionurl);
        unless ($numpathchgs) {
            my $modres =
                &Apache::loncommon::modify_html_refs('syllabus','portfolio/syllabus',
                                                     $cnum,$cdom,
                                                     '/userfiles',$env{'form.primaryurl'});
            $result .= $modres;
        }
        $output = $result.&return_to_editor($cdom,$cnum);
        $earlyout = 1;
    } elsif ($env{'form.phase'} eq 'check_embedded') {
        # Process file upload - phase three - modify references in HTML file
        my $uploadphase = 'modified_orightml';
        my $result =
            &Apache::loncommon::modify_html_refs('syllabus','portfolio/syllabus',
                                                 $cnum,$cdom,
                                                 '/userfiles',$env{'form.primaryurl'});
        $output = $result.&return_to_editor($cdom,$cnum);
        $earlyout = 1;
    }
    if ($putres eq 'ok') {
        if ((($is_ext) && ($is_ext ne $was_ext)) || ($was_ext)) {
            my $chome = &Apache::lonnet::homeserver($cnum,$cdom);
            unless ($chome eq 'no_host') {
                my %crsinfo = &Apache::lonnet::courseiddump($cdom,'.',1,'.','.',$cnum,undef,undef,'.');
                if (ref($crsinfo{$cdom.'_'.$cnum}) eq 'HASH') {
                    if ($external =~ m{^http://}) {
                        $crsinfo{$cdom.'_'.$cnum}{'extsyllplain'} = 1;
                    } elsif ($crsinfo{$cdom.'_'.$cnum}{'extsyllplain'}) {
                        delete($crsinfo{$cdom.'_'.$cnum}{'extsyllplain'});
                    }
                    &Apache::lonnet::courseidput($cdom,\%crsinfo,$chome,'notime');
                }
            }
        }
    }
    return ($earlyout,$uploaded,$external,$minimal,$output);
}

sub default_minimal_syllabus {
    my ($cnum,$cdom) = @_;
    my $title;
    if ($env{'form.syllabustitle'}) {
        $title = $env{'form.syllabustitle'};
        $title =~ s{`}{}g;
        $title=~s/^\s+//;
        $title=~s/\s+$//;
    }
    if ($title eq '') {
        $title = &mt('Syllabus');
    }
    my $initialtext = &mt('Replace with your own content.');
    my $newhtml = <<END;
<html>
<head>
<title>$title</title>
</head>
<body bgcolor="#ffffff">
<h2>$title</h2>
$initialtext
</body>
</html>
END
    $env{'form.output'}=$newhtml;
    return &Apache::lonnet::finishuserfileupload($cnum,$cdom,'output',
                                                 'portfolio/syllabus/loncapa.html');
}

sub update_syllabus_env {
    my ($cdom,$cnum,$courseenv,$saved,$uploaded,$minimal,$external) = @_;
    return ($uploaded,$minimal,$external) unless(ref($courseenv) eq 'HASH');
    my $now = time;
    my (@envkeys,%storehash);
    if ($saved eq 'template') {
        if ($uploaded || $env{'course.'.$env{'request.course.id'}.'.uploadedsyllabus'}) {
            push(@envkeys,'uploaded');
        }
        if ($minimal || $env{'course.'.$env{'request.course.id'}.'.minimalsyllabus'}) {
            push(@envkeys,'minimal');
        }
        if ($external || $env{'course.'.$env{'request.course.id'}.'.externalsyllabus'}) {
            push(@envkeys,'external');
        }
        $storehash{'updatedsyllabus'} = $now;
        &Apache::lonnet::appenv({'course.'.$env{'request.course.id'}.'.updatedsyllabus' => $now
});
    } elsif ($saved eq 'url') {
        my $prefix = &home_http_host($cdom,$cnum);
        if ($external =~ m{^\Q$prefix/uploaded/$cdom/$cnum/portfolio/syllabus/\E(.+)$}) {
            my $file = $1;
            if ($file eq 'loncapa.html') {
                if ($uploaded || $env{'course.'.$env{'request.course.id'}.'.uploadedsyllabus'}) {
                    push(@envkeys,'uploaded');
                }
            } elsif ($minimal || $env{'course.'.$env{'request.course.id'}.'.minimalsyllabus'}) {
                push(@envkeys,'minimal');
            }
        } else {
            if ($uploaded || $env{'course.'.$env{'request.course.id'}.'.uploadedsyllabus'}) {
                push(@envkeys,'uploaded');
            }
            if ($minimal || $env{'course.'.$env{'request.course.id'}.'.minimalsyllabus'}) {
                push(@envkeys,'minimal');
            }
        }
    } elsif ($saved eq 'file') {
        if ($minimal || $env{'course.'.$env{'request.course.id'}.'.minimalsyllabus'}) {
            push(@envkeys,'minimal');
        }
    } elsif ($saved eq 'minimal') {
        if ($uploaded || $env{'course.'.$env{'request.course.id'}.'.uploadedsyllabus'}) {
            push(@envkeys,'uploaded');
        }
    }
    if (@envkeys > 0) {
        foreach my $item (@envkeys) {
            my $key = $item.'syllabus';
            if ($courseenv->{$key} ne '') {
                &Apache::lonnet::delenv('course.'.$env{'request.course.id'}.'.'.$key);
                if ($item eq 'minimal') {
                    &update_access_permissions($cdom,$cnum,'/syllabus/loncapa.html');
                } elsif ($item eq 'uploaded') {
                    if ($courseenv->{$key} =~ m{^\Q/uploaded/$cdom/$cnum/portfolio\E(/syllabus/.+)$}) {
                        my $filename = $1;
                        &update_access_permissions($cdom,$cnum,$filename);
                    }
                }
                $storehash{$key} = '';
            } elsif ($env{'course.'.$env{'request.course.id'}.'.'.$key} ne '') {
                &Apache::lonnet::delenv('course.'.$env{'request.course.id'}.'.'.$key);
            }
            if ($item eq 'uploaded') {
                undef($uploaded);
            }
            if ($item eq 'external') {
                undef($external);
            }
            if ($item eq 'minimal') {
                undef($minimal);
            }
        }
    }
    if (keys(%storehash) > 0) {
        &Apache::lonnet::put('environment',\%storehash,$cdom,$cnum);
    }
    return ($uploaded,$minimal,$external);
}

sub update_access_permissions {
    my ($cdom,$cnum,$file_name) = @_;
    my $current_permissions = &Apache::lonnet::get_portfile_permissions($cdom,$cnum);
    my %access_controls =
        &Apache::lonnet::get_access_controls($current_permissions,'',$file_name);
    if (keys(%access_controls) > 0) {
        my %changes;
        foreach my $key (keys(%{$access_controls{$file_name}})) {
            $changes{'delete'}{$key} = 1;
        }
        if (keys(%changes) > 0) {
            my ($outcome,$deloutcome,$new_values,$translation) =
                &Apache::lonnet::modify_access_controls($file_name,\%changes,
                                                        $cdom,$cnum);
        }
    }
    return; 
}

sub home_http_host {
    my ($cdom,$cnum) = @_;
    my $home=&Apache::lonnet::homeserver($cnum,$cdom);
    if ($home ne 'no_host') {
        my $hostname = &Apache::lonnet::hostname($home);
        my $protocol = $Apache::lonnet::protocol{$home};
        $protocol = 'http' if ($protocol ne 'https');
        return $protocol.'://'.$hostname;
    }
    return;
}

sub process_upload {
    my ($upload_output,$cnum,$cdom,$allfiles,$codebase) = @_;
    my ($parseaction,$showupload,$mimetype);
    my $dest = 'portfolio/syllabus';
    if ($env{'form.parserflag'}) {
        $parseaction = 'parse';
    }
    my $url=&Apache::lonnet::userfileupload('syllabusfile','syllabus',$dest,
                                            $parseaction,$allfiles,
                                            $codebase,undef,undef,undef,undef,
                                            undef,undef,\$mimetype);
    if ($url =~ m{^/uploaded/\Q$cdom\E/\Q$cnum\E.*/([^/]+)$}) {
        my $stored = $1;
        $showupload = '<p>'.&mt('Uploaded [_1]',
                                '<span class="LC_filename">'.$stored.'</span>').
                      '</p>';
    } else {
        my ($filename) = ($env{'form.syllabusfile.filename'} =~ m{([^/]+)$});
        $$upload_output = '<div class="LC_error" id="uploadfileresult">'.
                          &mt('Unable to save file [_1].',
                              '<span class="LC_filename">'.$filename.'</span>').
                          '</div>';
        return (); 
    }
    my $needlink;
    if (($parseaction eq 'parse') && ($mimetype eq 'text/html')) {
        $$upload_output = $showupload;
        my $total_embedded = scalar(keys(%{$allfiles}));
        if ($total_embedded > 0) {
            my $uploadphase = 'upload_embedded';
            my $primaryurl = &HTML::Entities::encode($url,'<>&"');
            my $state = &embedded_form_elems($uploadphase,$primaryurl);
            my $actionurl = "/public/$cdom/$cnum/syllabus";
            my ($embedded,$num,$numpathchanges,$existing);
            ($embedded,$num,$numpathchanges,$existing) =
                &Apache::loncommon::ask_for_embedded_content($actionurl,$state,
                                                             $allfiles,$codebase,
                                                            {'error_on_invalid_names'   => 1,
                                                             'ignore_remote_references' => 1,});
            if ($embedded) {
                $needlink = 1;
                if ($num) {
                    $$upload_output .=
                        '<p>'.&mt('This file contains embedded multimedia objects, which need to be uploaded.').'</p>'.$embedded;
                } elsif ($numpathchanges) {
                    $$upload_output .= $embedded;
                } else {
                    $$upload_output .= $embedded;
                    &Apache::loncommon::modify_html_refs('syllabus','portfolio/syllabus',
                                                         $cnum,$cdom,'/userfiles',$url);
                }
            } else {
                $$upload_output .= &mt('Embedded item(s) already present, so no additional upload(s) required').'<br />';
                &Apache::loncommon::modify_html_refs('syllabus','portfolio/syllabus',
                                                     $cnum,$cdom,'/userfiles',$url);

            }
        } else {
            $$upload_output .= &mt('No embedded items identified').'<br />';
        }
        $$upload_output = '<div id="uploadfileresult">'.$$upload_output.'</div>';
    }
    return ($url,$needlink);
}

sub embedded_form_elems {
    my ($phase,$primaryurl) = @_;
    return <<STATE;
    <input type="hidden" name="forceedit" value="1" />
    <input type="hidden" name="cmd" value="upload_embedded" />
    <input type="hidden" name="phase" value="$phase" />
    <input type="hidden" name="primaryurl" value="$primaryurl" />
STATE
}

sub return_to_editor {
    my ($cdom,$cnum) = @_;
    my $actionurl = "/public/$cdom/$cnum/syllabus";
    return '<p><form name="backtoeditor" method="post" action="'.$actionurl.'" />'.
           '<input type="hidden" name="forceedit" value="1" />'."\n".
           '<a href="javascript:document.backtoeditor.submit();">'.&mt('Return to Editor').
           '</a></p>';
}

sub editfile_button {
    my ($url,$context,$editable) = @_;
    my $edittext=&mt('Edit');
    my $deltext=&mt('Delete');
    my $output;
    if ($editable) {
        $output = '
                <input type="button" value="'.$edittext.'" onclick="javascript:gotoeditor('."'$url'".');" name="edit_'.$context.'" />
                &nbsp;&nbsp;&nbsp;';
    }
    $output .= '
                <input type="button" value="'.$deltext.'" onclick="javascript:dodelete('."'$context'".');" name="del_'.$context.'" />
                <input type="hidden" value="" name="deleteuploaded_'.$context.'" id="deleteuploaded_'.$context.'" />
    ';
    return $output;
}

sub editbutton_js {
    my %js_lt = &Apache::lonlocal::texthash(
               min    => 'Are you sure you want to delete the contents of the syllabus template?',
               file   => 'Are you sure you want to delete the uploaded syllabus file?',
               noundo => 'This action cannot be reversed.'
             );
    &js_escape(\%js_lt);
    return <<ENDJS;
                <script type="text/javascript">
                // <![CDATA[
                  function gotoeditor(url) {
                      document.location.href = url+'?editmode=1&forceedit=1';
                  }
                  function dodelete(caller,url) {
                      if (document.getElementById('deleteuploaded_'+caller)) {
                          document.getElementById('deleteuploaded_'+caller).value=1;
                          if (caller == 'minimal') {
                              if (confirm("$js_lt{'min'}"+"\\n"+"$js_lt{'noundo'}")) {
                                  document.syllabus.submit();
                              }
                          }
                          if (caller == 'file') {
                              if (confirm("$js_lt{'file'}"+"\\n"+"$js_lt{'noundo'}")) {
                                  document.syllabus.submit();
                              }
                          }
                      }
                      return;   
                  }
                // ]]>
                </script>
ENDJS
}

sub redirect_to_http {
    my ($r) = @_;
    &Apache::loncommon::content_type($r,'text/html');
    &Apache::loncommon::no_cache($r);
    $r->send_http_header;
    my $url = 'http://'.$r->hostname().$r->uri().'?usehttp=1';
    $r->print(&Apache::loncommon::start_page(undef,undef,
                                             {'redirect' => [0,$url],}).
              &Apache::loncommon::end_page());
    return;
}

1;
__END__
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>500 Internal Server Error</title>
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<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at 
 root@localhost to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
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