--- rat/lonwrapper.pm	2005/02/17 09:09:57	1.17
+++ rat/lonwrapper.pm	2020/03/05 22:05:50	1.49.2.10
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Wrapper for external and binary files as standalone resources
 #
-# $Id: lonwrapper.pm,v 1.17 2005/02/17 09:09:57 albertel Exp $
+# $Id: lonwrapper.pm,v 1.49.2.10 2020/03/05 22:05:50 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -26,109 +26,368 @@
 # http://www.lon-capa.org/
 #
 
+
 package Apache::lonwrapper;
 
 use strict;
 use Apache::Constants qw(:common);
-use Apache::lonnet();
-use Apache::lonxml();
-use Apache::lonmenu;
+use Apache::lonenc();
+use Apache::lonnet;
+use Apache::lonlocal;
+use Apache::loncommon();
+use Apache::lonhtmlcommon();
+use Apache::lonextresedit();
 
 # ================================================================ Main Handler
+sub wrapper {
+    my ($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$title) = @_;
+
+    my $forcereg;
+    unless ($env{'form.folderpath'}) {
+        $forcereg = 1;
+    }
+
+    my %lt = &Apache::lonlocal::texthash(
+                                          'noif' => 'No iframe support.',
+                                          'show' => 'Show content in pop-up window',
+                                        );
+
+    my ($anchor,$uselink,$linktext);
+    if ($is_ext) {
+        if ($env{'form.symb'}) {
+            (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
+            if ($res =~ /(#[^#]+)$/) {
+                $anchor = $1;
+            }
+        } elsif ($env{'form.anchor'} ne '') {
+            $anchor = '#'.$env{'form.anchor'};
+        }
+        unless (($is_pdf) && ($env{'browser.mobile'})) {
+            my $hostname = $r->hostname();
+            my $lonhost = $r->dir_config('lonHostID');
+            my $ip = &Apache::lonnet::get_host_ip($lonhost);
+            $uselink = &Apache::loncommon::is_nonframeable($url,$absolute,$hostname,$ip);
+        }
+    }
+
+    my $noiframe = &Apache::loncommon::modal_link($url.$anchor,$lt{'show'},500,400);
+    my $args = {'bgcolor' => '#FFFFFF'};
+    if ($forcereg) {
+        $args->{'force_register'} = $forcereg;
+    }
+    if (ref($brcrum) eq 'ARRAY') {
+        $args->{'bread_crumbs'} = $brcrum;
+    }
+    if ($absolute) {
+        $args->{'use_absolute'} = $absolute;
+    }
+    if ($env{'form.only_body'}) {
+        $args->{'only_body'} = $env{'form.only_body'};
+    }
+
+    my $headjs;
+
+#
+# Where iframe is in use, if window.onload() executes before the custom resize function
+# has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
+# are used to ensure document.ready() triggers a call to resize, so the iframe contents
+# do not obscure the Functions menu.
+#
+
+    unless (($env{'browser.mobile'}) || $uselink) {
+        $headjs = '
+<script type="text/javascript">
+// <![CDATA[
+var LCnotready = 0;
+var LCresizedef = 0;
+// ]]>
+</script>'."\n";
+    }
+
+    my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args);
+    my $endpage = &Apache::loncommon::end_page();
+
+    if (($uselink) && ($title eq '')) {
+        if ($env{'form.symb'}) {
+            $title=&Apache::lonnet::gettitle($env{'form.symb'});
+        } else {
+            my $symb=&Apache::lonnet::symbread($r->uri);
+            if ($symb) {
+                $title=&Apache::lonnet::gettitle($symb);
+            }
+        }
+    }
+    if ($env{'browser.mobile'}) {
+        my $output = $startpage;
+        if ($is_pdf) {
+            $linktext = &mt('Link to PDF (for mobile devices)');
+            $output .= &create_link($url,$anchor,$title,$linktext);
+        } else {
+            if ($uselink) {
+                $linktext = &mt('Link to resource');
+                $output .= &create_link($url,$anchor,$title,$linktext);
+            } else {
+                my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
+                $output .= '<div style="overflow:scroll; -webkit-overflow-scrolling:touch;">'."\n".
+                           '<iframe src="'.$dest.'" height="100%" width="100%" frameborder="0">'."\n".
+                           "$lt{'noif'} $noiframe\n".
+                           "</iframe>\n".
+                           "</div>\n";
+            }
+        }
+        $output .= $endpage;
+        return $output;
+    } elsif ($uselink) {
+        $linktext = &mt('Link to resource');
+        return $startpage.&create_link($url,$anchor,$title,$linktext).$endpage;
+    } else {
+        my $offset = 5;
+        &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['inhibitmenu']);
+        if ($env{'form.inhibitmenu'} eq 'yes') {
+            $offset = 0;
+        }
+        my $script = &Apache::lonhtmlcommon::scripttag(<<SCRIPT);
+        \$(document).ready( function() {
+            \$(window).unbind('resize').resize(function(){
+                var header = null;
+                var offset = $offset;
+                var height = 0;
+                var hdrtop = 0;
+                if (\$('div.LC_head_subbox:first').length) {
+                    header = \$('div.LC_head_subbox:first');
+                    offset = 9;
+                } else {
+                    if (\$('#LC_breadcrumbs').length) {
+                        header = \$('#LC_breadcrumbs');
+                    }
+                }
+                if (header != null && header.length) {
+                    height = header.height();
+                    hdrtop = header.position().top;
+                }
+                var pos = height + hdrtop + offset;
+                \$('.LC_iframecontainer').css('top', pos);
+            });
+            LCresizedef = 1;
+            if (LCnotready == 1) {
+                LCnotready = 0;
+                \$(window).trigger('resize');
+            }
+        });
+        window.onload = function(){
+            if (LCresizedef) {
+                LCnotready = 0;
+                \$(window).trigger('resize');
+            } else {
+                LCnotready = 1;
+            }
+        };
+SCRIPT
+        # javascript will position the iframe if window was resized (or zoomed)
+        return <<ENDFRAME;
+        $startpage
+        $script
+        <div class="LC_iframecontainer">
+            <iframe src="$url$anchor">$lt{'noif'} $noiframe</iframe>
+        </div>
+        $endpage
+ENDFRAME
+    }
+}
+
+sub create_link {
+    my ($url,$anchor,$title,$linktext) = @_;
+    my $shownlink;
+    if ($title eq '') {
+        $title = $env{'form.title'};
+        if ($title eq '') {
+            unless ($env{'request.enc'}) {
+                ($title) = ($url =~ m{/([^/]+)$});
+                $title =~ s/(\?[^\?]+)$//;
+            }
+        }
+    }
+    unless ($title eq '') {
+        $shownlink = '<span style="font-weight:bold;">'.$title.'</span><br />';
+    }
+    my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
+    $shownlink .= '<a href="'.$dest.'">'.$linktext.'</a>';
+    return $shownlink;
+}
 
 sub handler {
-  my $r=shift;
-  &Apache::loncommon::content_type($r,'text/html');
-  $r->send_http_header;
-
-  return OK if $r->header_only;
-
-  &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-                                          ['wrapperdisplay']);
-  my $orgurl=$r->uri;
-  my $url=$orgurl;
-  $orgurl.=(($orgurl=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
-  $orgurl.=(($orgurl=~/\?/)?'&':'?').'wrapperdisplay=menu';
-  $url=~s/^\/adm\/wrapper//;
-  $url=~s/^\/ext\//http\:\/\//;
-  $url=~s|&colon;|:|g;
-  if ($ENV{'form.wrapperdisplay'} eq 'menu') {
-#
-# Producing the menu buttons
-#
-      $r->print('<html><body bgcolor="#FFFFFF">'.
-                &Apache::lonmenu::menubuttons(1,'web',1).'</body></html>');
-  } else {
+    my $r=shift;
+    &Apache::loncommon::content_type($r,'text/html');
+    $r->send_http_header;
+
+    return OK if $r->header_only;
+
+    my $url = $r->uri;
+    my ($is_ext,$brcrum,$absolute,$is_pdf,$cdom,$cnum,$hostname);
+
+    for ($url){
+        s|^/adm/wrapper||;
+        $is_ext = $_ =~ s|^/ext/|http://|;
+        s|http://https://|https://| if ($is_ext);
+        s|&colon;|:|g;
+    }
+
+    if ($url =~ /\.pdf$/i) {
+        $is_pdf = 1;
+    }
+ 
+    if ($is_ext) {
+        &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+            ['forceedit','register','folderpath','symb','idx','title','anchor']);
+        if (($env{'form.forceedit'}) &&
+            (&Apache::lonnet::allowed('mdc',$env{'request.course.id'})) &&
+            (($env{'form.folderpath'} =~ /^supplemental/) ||
+             ($env{'form.symb'} =~ /^uploaded/))) {
+            if ($env{'form.symb'}) {
+                (undef,undef,my $res) = &Apache::lonnet::decode_symb($env{'form.symb'});
+                if ($res =~ /(#[^#]+)$/) {
+                    $url .= $1;
+                }
+            } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
+                if ($env{'form.anchor'} ne '') {
+                    $url .= '#'.$env{'form.anchor'};
+                }
+            }
+            if (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
+                $hostname = $r->hostname();
+            }
+            my $type = 'ext';
+            $r->print(
+                &Apache::lonextresedit::display_editor($url,$env{'form.folderpath'},
+                                                       $env{'form.symb'},
+                                                       $env{'form.idx'},$type,$cdom,
+                                                       $cnum,$hostname));
+            return OK;
+        } elsif ($env{'form.folderpath'} =~ /^supplemental/) {
+            my $crstype = &Apache::loncommon::course_type();
+            my $title = $env{'form.title'};
+            if ($title eq '') {
+                $title = &mt('External Resource');
+            }
+            $brcrum =
+                &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
+        }
+    }
+
 #
 # Actual URL
 #
-      if ($url=~/\.(problem|exam|quiz|assess|survey|form|library)$/) {
+    if ($url=~/$LONCAPA::assess_re/) {
 #
 # This is uploaded homework
 #
-          $ENV{'request.state'}='uploaded';
-          &Apache::lonhomework::renderpage($r,$url);
-      } else {
+        $env{'request.state'}='uploaded';
+        &Apache::lonhomework::renderpage($r,$url);
+    } else {
 #
 # This is not homework
 #
-	  $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'}; 
-                                                 # reappend the query arguments
-	  my $events='onLoad="'.&Apache::lonmenu::loadevents.
-	      '" onUnload="'.&Apache::lonmenu::unloadevents.'"';
-	  my $script=&Apache::lonmenu::registerurl(1,undef);
-
-	  if ($ENV{'browser.interface'} eq 'textual') {
-#
-# ssi-based rendering for text-based interface
-#
-	      $r->print('<html><head>'.
-			&Apache::lonmenu::registerurl(1).
-			'</head><body bgcolor="#FFFFFF">'.
-			&Apache::lonmenu::menubuttons(1).
-			&Apache::lonnet::ssi_body($url).'</body></html>');
-	  } elsif ($ENV{'environment.remote'} eq 'off') {
-#
-# This is inline remote
-# 
-	      $r->print(<<ENDDOCUMENTINL);
-<html>
-<head>
-$script
-</head>
-<frameset rows="180,*" border=0 $events>
-<frame src="$orgurl">
-<frame src="$url">
-</frameset>
-</html>
-ENDDOCUMENTINL
-          } else {
-#
-# frame-based rendering for graphical interface
-#
-	  $r->print(<<ENDDOCUMENT);
-<html>
-<head>
-$script
-</head>
-<frameset rows="1,*" border=0 $events>
-<frame src="/adm/rat/empty.html">
-<frame src="$url">
-</frameset>
-</html>
-ENDDOCUMENT
-          }
-      } # not homework
-  } # not just the menu
-  return OK;
+        if ($is_ext) {
+            $absolute = $env{'request.use_absolute'};
+            $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
+            $ENV{'QUERY_STRING'} =~ s/\&$//;
+        }
+
+        unless ($ENV{'QUERY_STRING'} eq '') {
+            $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
+        }
+
+        # encrypt url if not external
+        &Apache::lonenc::check_encrypt(\$url) if $url !~ /^https?\:/ ;
+
+        $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf) );
+
+    } # not just the menu
+    
+    return OK;
 } # handler
 
 1;
 __END__
 
+=pod
+
+=head1 NAME
+
+Apache::lonwrapper - External and binary file management.
+
+=head1 SYNOPSIS
+
+Wrapper for external and binary files as standalone resources. Edit handler for rat maps; TeX content handler.
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+=head1 Subroutines
+
+=over
+
+=item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$title))
+
+=over
+
+=item $r
+
+request object
+
+=item $url
+
+url to display by including in an iframe within a
+LON-CAPA page which has a standard LON-CAPA inline menu.
+
+=item $brcrum
+
+breadcrumbs for unregistered urls
+(i.e., external resources in Supplemental Content).
+
+=item $absolute
+
+contains protocol (http or https) followed by
+the hostname, if menu items in the standard LON-CAPA
+interface created by the call to loncommon::start_page()
+within &wrapper() need to use absolute URLs rather than
+relative URLs.
+
+That will be the case where an external resource has been 
+served from port 80, when the server customarily serves
+requests using Apache/SSL (i.e., port 443). mod_rewrite 
+is used to switch requests for external resources and
+the syllabus: /public/<domain>/<courseid>/syllabus
+(which might also point at an external resource)
+from https:// to http:// where the the URL of the remote site 
+specified in the resource itself is http://.
+
+This is done to avoid default mixed content blocking
+in Firefox 23 and later, when serving from Apache/SSL.
+
+=item $is_ext
+
+true if URL is for an external resource.
+
+=item $is_pdf
+
+true if URL is for a PDF (based on file extension).
+
+=item $title
+
+optional. If wrapped item is a PDF, and $env{'browser.mobile'} 
+is true, a link to a PDF is shown. The "title" will be displayed
+above the link, but if not provided as an arg, $env{'form.title'}
+will be used, otherwise, the filename will be displayed (unless
+hidden URL set for the resource).
 
+=back
 
+Returns markup for the entire page.
 
+=item handler()
 
+=back
 
+=cut