--- rat/lonwrapper.pm	2010/02/11 15:10:01	1.32.2.1
+++ rat/lonwrapper.pm	2021/10/19 00:16:32	1.77
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Wrapper for external and binary files as standalone resources
 #
-# $Id: lonwrapper.pm,v 1.32.2.1 2010/02/11 15:10:01 raeburn Exp $
+# $Id: lonwrapper.pm,v 1.77 2021/10/19 00:16:32 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -31,80 +31,284 @@ package Apache::lonwrapper;
 
 use strict;
 use Apache::Constants qw(:common);
-use Apache::lonnet;
-use Apache::lonxml();
 use Apache::lonenc();
-use Apache::lonmenu();
+use Apache::lonnet;
+use Apache::lonlocal;
+use Apache::loncommon();
+use Apache::lonhtmlcommon();
+use Apache::lonextresedit();
+use Apache::lonexttool();
+use Apache::lonhomework();
+use LONCAPA qw(:DEFAULT :match);
+use HTML::Entities();
 
 # ================================================================ Main Handler
+sub wrapper {
+    my ($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,
+        $title,$width,$height) = @_;
 
-sub simple_menu {
-#
-# Producing the menu buttons
-#
-    return &Apache::loncommon::start_page('Menu',undef,
-					  {'only_body' => 1,
-					   'bgcolor'   => '#FFFFFF',}).
-	&Apache::lonmenu::menubuttons(1,'web',1).
-	&Apache::loncommon::end_page();
-}
+    my $forcereg;
+    unless ($env{'form.folderpath'}) {
+        $forcereg = 1;
+    }
+    my %lt = &Apache::lonlocal::texthash(
+                                          'noif' => 'No iframe support.',
+                                          'show' => 'Show content in pop-up window',
+                                        );
+
+    (undef,undef,undef,undef,undef,undef,my $clientmobile) =
+        &Apache::loncommon::decode_user_agent($r);
+
+    my ($anchor,$uselink);
+    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 (($is_pdf) && ($clientmobile)) {
+            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'};
+    }
 
-sub wrapper {
-    my ($topurl,$bottomurl) = @_;
+    my ($countdown,$donemsg,$headjs);
+    if (($exttool) && (&Apache::lonnet::EXT('resource.0.gradable') =~ /^yes$/i)) {
+        $Apache::lonhomework::browse = &Apache::lonnet::allowed('bre',$url);
+        if ($env{'form.markaccess'}) {
+            my $symb=&Apache::lonnet::symbread($url);
+            my @interval=&Apache::lonnet::EXT('resource.0.interval',$symb);
+            my ($timelimit) = split(/_/,$interval[0]);
+            my $setres = &Apache::lonnet::set_first_access($interval[1],$timelimit);
+            if ($setres eq 'ok') {
+                delete($env{'form.markaccess'});
+            }
+        } elsif ($env{'form.LC_interval_done'} eq 'true') {
+            my $symb=&Apache::lonnet::symbread($url);
+            if ($symb) {
+                (my $donebuttonresult,$donemsg) = &Apache::lonhomework::zero_timer($symb);
+                undef($env{'form.LC_interval_done'});
+                undef($env{'form.LC_interval_done_proctorpass'});
+            }
+        }
+        my ($status,$result,$resource_due) =
+            &Apache::lonexttool::gradabletool_access_check();
+        undef($Apache::lonhomework::browse);
+        if ($status eq 'CAN_ANSWER') {
+            if ($resource_due) {
+                my $time_left = $resource_due - time();
+                if ($resource_due && ($time_left > 0)) {
+                    $countdown ='
+<script type="text/javascript">
+// <![CDATA['."\n".
+                             &Apache::lonhtmlcommon::countdown().'
+// ]]>
+</script>'."\n".
+                    &Apache::lonhtmlcommon::set_due_date($resource_due);
+                }
+            }
+        } else {
+            if ($status eq 'SHOW_ANSWER') {
+                $result = &Apache::lonexttool::display_score().
+                          &Apache::lonfeedback::list_discussion('tool','OPEN');
+            }
+            return &Apache::loncommon::start_page('Menu',undef,$args).
+                   $result.
+                   &Apache::loncommon::end_page();
+        }
+    }
 
-    if ($env{'browser.interface'} eq 'textual') {
 #
-# ssi-based rendering for text-based interface
+# Where iframe is in use, if window.onload() executes before the custom resize function
+# has been defined (jQuery), two global javascript vars (LCnotready and LCresizedef)
+# are used to ensure document.ready() triggers a call to resize, so the iframe contents
+# do not obscure the Functions menu.
 #
-	return 
-	    &Apache::loncommon::start_page('Menu',undef,
-					  {'bgcolor'        => '#FFFFFF',
-					   'force_register' => 1,
-				       }).
-	    &Apache::lonnet::ssi_body($bottomurl).
-	    &Apache::loncommon::end_page();
+
+    unless ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab') || $uselink) {
+        $headjs = '
+<script type="text/javascript">
+// <![CDATA[
+var LCnotready = 0;
+var LCresizedef = 0;
+// ]]>
+</script>'."\n";
     }
 
+    my $startpage = &Apache::loncommon::start_page('Menu',$headjs,$args).$countdown.$donemsg;
+    my $endpage = &Apache::loncommon::end_page();
 
-    my %layout = ('border' => 0);
-    if ($env{'environment.remote'} eq 'off') {
-        if ($env{'environment.icons'} eq 'iconsonly') {
-           $layout{'rows'} = "100,*";
+    if (($uselink) && ($title eq '')) {
+        if ($env{'form.symb'}) {
+            $title=&Apache::lonnet::gettitle($env{'form.symb'});
         } else {
-	   $layout{'rows'} = "200,*";
+            my $symb=&Apache::lonnet::symbread($r->uri);
+            if ($symb) {
+                $title=&Apache::lonnet::gettitle($symb);
+            }
         }
+    }
+    if ($clientmobile || ($exttool eq 'window') || ($exttool eq 'tab')) {
+        my $output = $startpage;
+        if ($is_pdf) {
+            $linktext = &mt('Link to PDF (for mobile devices)');
+            $output .= &create_link($url,$anchor,$title,$linktext);
+        } elsif (($exttool eq 'window') || ($exttool eq 'tab')) {
+            if ($linktext eq '') {
+                $linktext = &mt('Launch External Tool');
+            }
+            $url = &HTML::Entities::encode($url,'"<>&');
+            if ($exttool eq 'tab') {
+                $output .= '<div>'.
+                           '<a href="'.$url.'" target="LCExternalToolTab" style="padding:0;clear:both;margin:0;border:0">'.
+                           $linktext.'</a>'.
+                           '</div>';
+            } else {
+                $output .= <<"ENDLINK";
+<script type="text/javascript">
+// <![CDATA[
+var windowObjectReference = null;
+var PreviousUrl;
+
+function openSinglePopup(strUrl) {
+    if (windowObjectReference == null || windowObjectReference.closed) {
+        windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
+                                            "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
+    } else if(PreviousUrl != strUrl) {
+        windowObjectReference = window.open(strUrl, "LCExternalToolPopUp",
+                                            "height=$height,width=$width,scrollbars=yes,resizable=yes,status=yes,menubar=no,location=no'");
+        windowObjectReference.focus();
     } else {
-	$layout{'rows'} = "1,*";
-	$topurl = "/adm/rat/empty.html";
+        windowObjectReference.focus();
+    };
+    PreviousUrl = strUrl;
+}
+// ]]>
+</script>
+<div>
+<a href="$url" target="LCExternalToolPopUp" onclick="openSinglePopup(this.href); return false;">
+$linktext</a>
+</div>
+ENDLINK
+            }
+            if ($explanation ne '') {
+                $output .= '<div>'.$explanation.'</div>';
+            }
+            if (&Apache::lonnet::EXT('resource.0.gradable')) {
+                $output .= &Apache::lonfeedback::list_discussion('tool','OPEN');
+            }
+        } else {
+            if ($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)
+        my $dest = &HTML::Entities::encode($url.$anchor,'&<>"');
+        return <<ENDFRAME;
+        $startpage
+        $script
+        <div class="LC_iframecontainer">
+            <iframe src="$dest">$lt{'noif'} $noiframe</iframe>
+        </div>
+        $endpage
+ENDFRAME
     }
+}
 
-    my $start_page = 
-	&Apache::loncommon::start_page(undef,undef,
-				       {'force_register' => 1,
-					'frameset'       => 1,
-					'add_entries'    => \%layout, });
-
-    my $end_page = 
-	&Apache::loncommon::end_page({'frameset' => 1});
-    
-    foreach my $url ($topurl,$bottomurl) {
-	if ($url !~ /^https?\:/) {
-	    $url = &Apache::lonenc::check_encrypt($url);
-	}
-    }
-#
-# frame-based rendering for graphical interface
-#
-    my $result =<<ENDDOCUMENT;
-$start_page
-test
-<frame src="$topurl" />
-<frame src="$bottomurl" />
-$end_page
-ENDDOCUMENT
-
-    return $result;
+sub create_link {
+    my ($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 {
@@ -114,43 +318,124 @@ sub handler {
 
     return OK if $r->header_only;
 
-    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-					    ['wrapperdisplay']);
-    if ($env{'form.wrapperdisplay'} eq 'menu') {
-	$r->print(&simple_menu());
-	return OK;
-    }
-
-    my $orgurl=$r->uri;
-    my $url=$orgurl;
-    $orgurl.=(($orgurl=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
-    $orgurl.=(($orgurl=~/\?/)?'&':'?').'wrapperdisplay=menu';
-    $url=~s/^\/adm\/wrapper//;
-    my $is_ext = $url =~ m|^/ext/|;
-    $url=~s{^/ext/}{http://};
-    $url=~s|http://https://|https://|;
-    $url=~s|&colon;|:|g;
+    my $url = $r->uri;
+    my ($is_ext,$brcrum,$absolute,$is_pdf,$exttool,$cdom,$cnum,$hostname,
+        $linktext,$explanation,$width,$height);
+
+    for ($url){
+        s|^/adm/wrapper||;
+        $is_ext = $_ =~ s|^/ext/|http://|;
+        s|http://https://|https://| if ($is_ext);
+        s|&colon;|:|g;
+    }
+
+    if ($url =~ /\.pdf$/i) {
+        $is_pdf = 1;
+    } elsif ($url =~ m{^/adm/($match_domain)/($match_courseid)/(\d+)/ext\.tool$}) {
+        $cdom = $1;
+        $cnum = $2;
+        my $marker = $3;
+        $exttool = 'iframe';
+        my $exttoolremote;
+        my %toolhash = &Apache::lonnet::get('exttool_'.$marker,['target','linktext','explanation','id','width','height'],
+                                            $cdom,$cnum);
+        if ($toolhash{'id'}) {
+            my %ltitools = &Apache::lonnet::get_domain_lti($cdom,'consumer');
+            if (ref($ltitools{$toolhash{'id'}}) eq 'HASH') {
+                $exttoolremote = $ltitools{$toolhash{'id'}}{'url'};
+            }
+        }
+        if ($toolhash{'target'} eq 'window') {
+            $exttool = 'window';
+            $width = $toolhash{'width'};
+            $height = $toolhash{'height'};
+        } elsif ($toolhash{'target'} eq 'tab') {
+            $exttool = 'tab';
+        }
+        if (($exttool eq 'window') || ($exttool eq 'tab')) {
+            $linktext = $toolhash{'linktext'};
+            $explanation = $toolhash{'explanation'};
+        } elsif (($exttoolremote =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
+            $exttool = 'tab';
+        }
+    }
+    if (($is_ext) || ($exttool)) {
+        &Apache::loncommon::get_unprocessed_cgi($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'};
+                }
+            }
+            my $type = 'ext';
+            if ($exttool) {
+                $type = 'tool';
+            } elsif (($url =~ /^http:/) && ($ENV{'SERVER_PORT'} == 443)) {
+                $hostname = $r->hostname();
+            }
+            $r->print(
+                &Apache::lonextresedit::display_editor($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 '') {
+                if ($is_ext) {
+                    $title = &mt('External Resource');
+                } else {
+                    $title = &mt('External Tool');
+                }
+            }
+            $brcrum =
+                &Apache::lonhtmlcommon::docs_breadcrumbs(undef,$crstype,undef,$title,1);
+        }
+    }
+
 #
 # Actual URL
 #
-    if ($url=~/\.(problem|exam|quiz|assess|survey|form|library)$/) {
+    if (($url=~/$LONCAPA::assess_re/) && (!$exttool)) {
 #
 # This is uploaded homework
 #
-	$env{'request.state'}='uploaded';
-	&Apache::lonhomework::renderpage($r,$url);
+        $env{'request.state'}='uploaded';
+        &Apache::lonhomework::renderpage($r,$url);
     } else {
 #
 # This is not homework
 #
-	if ($is_ext) {
-	    $ENV{'QUERY_STRING'}=~s/(^|\&)symb=[^\&]*/$1/;
+        if (($is_ext) || ($exttool)) {
+            $absolute = $env{'request.use_absolute'};
+            $ENV{'QUERY_STRING'} =~ s/(^|\&)symb=[^\&]*/$1/;
             $ENV{'QUERY_STRING'} =~ s/\&$//;
-	}
-	$url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'}; 
-	# reappend the query arguments
-	$r->print(&wrapper($orgurl,$url));
+        }
+
+        unless ($ENV{'QUERY_STRING'} eq '') {
+            $url.=(($url=~/\?/)?'&':'?').$ENV{'QUERY_STRING'};
+        }
+
+        # encrypt url if not external
+        unless ($is_ext) {
+            &Apache::lonenc::check_encrypt(\$url);
+        }
+
+        $r->print( wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,
+                           $linktext,$explanation,undef,$width,$height) );
+
     } # not just the menu
+    
     return OK;
 } # handler
 
@@ -174,19 +459,119 @@ described at http://www.lon-capa.org.
 
 =over
 
-=item simple_menu()
+=item wrapper($r,$url,$brcrum,$absolute,$is_ext,$is_pdf,$exttool,$linktext,$explanation,$title,$width,$height)
+
+=over
+
+=item $r
 
-=item wrapper()
+request object
 
-=item handler()
+=item $url
 
-=back
+url to display either by including in an iframe within a
+LON-CAPA page which has a standard LON-CAPA inline menu,
+or in some cases launched in a separate tab or window,
+launched via a link in a LON-CAPA page with standard inline
+menu.
 
-=cut
+=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 $exttool
 
+If URL is for an External Tool, will contain the target type: iframe, window or tab.
+
+=item $linktext
+
+optional. If URL is for an External Tool, and target type is window or tab, 
+then the link text may be an option set in the course for each tool instance,
+or may be a default defined in the domain for all instances of the tool.
+
+=item $explanation
+
+optional. If URL is for an External Tool, and target type is window or tab, 
+then the explanation is an option set in the course for each tool instance,
+or may be a default defined in the domain for all instances of the tool.
+
+=item $title
+
+optional. If wrapped item is a PDF, and $clientmobile 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).
+
+=item $width
+
+optional. If URL is for an External Tool, and target type is window,
+then a default width may have been defined in the domain for all instances of 
+the tool.  If so, that width will be used for the window opened (via a link)
+to launch the external tool.
+
+=item $height
+
+optional. If URL is for an External Tool, and target type is window,
+then a default height may have been defined in the domain for all instances of 
+the tool.  If so, that height will be used for the window opened (via a link)
+to launch the external tool.
+
+=back
+
+Returns markup for the entire page.
+
+=item handler()
+
+Content handler for requests for: /adm/wrapper/...
+used for content to be displayed in an iframe, or launched in a separate tab
+or window via a link.  The target URL is extracted from the requested URL, by
+removing the /adm/wrapper prefix. 
+
+The target URL will typically be a PDF served from the current server, an 
+external resource URL served from a different server, or an external tool
+(from an LTI Provider) launched from LON-CAPA (as LTI Consumer) and launched
+via a link.
+
+If the request included forceedit in the query string, and the requester has
+rights to modify course content, then the editor will be didplayed to allow
+changes to be made to the resource (e.g., change the URL of the external resource,
+or change the setting for the external tool instance.
+
+If not in edit mode, then the wrapper() subroutine will be called to generate the
+standard LON-CAPA inline menu, and then either a link to launch a separate tab or
+window, or an iframe to display the content inline. 
+
+=back
+
+=cut