--- loncom/publisher/lonupload.pm	2010/02/16 10:26:17	1.49
+++ loncom/publisher/lonupload.pm	2023/07/23 11:54:56	1.71
@@ -1,8 +1,7 @@
-
 # The LearningOnline Network with CAPA
 # Handler to upload files into construction space
 #
-# $Id: lonupload.pm,v 1.49 2010/02/16 10:26:17 bisitz Exp $
+# $Id: lonupload.pm,v 1.71 2023/07/23 11:54:56 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -70,7 +69,7 @@ Start page output
 
 =item *
 
-output relevant interface phase (phaseone or phasetwo or phasethree)
+output relevant interface phase (phaseone, phasetwo, phasethree or phasefour)
 
 =item *
 
@@ -99,6 +98,11 @@ as overwriting an existing file).
 Interface for handling secondary uploads of embedded objects
 in an html file.
 
+=item phasefour()
+
+Interface for handling optional renaming of links to embedded
+objects. 
+
 =item upfile_store()
 
 Store contents of uploaded file into temporary space.  Invoked
@@ -121,13 +125,12 @@ use Apache::File;
 use File::Copy;
 use File::Basename;
 use Apache::Constants qw(:common :http :methods);
-use Apache::loncacc;
 use Apache::loncommon();
 use Apache::lonnet;
 use HTML::Entities();
 use Apache::lonlocal;
 use Apache::lonnet;
-use LONCAPA();
+use LONCAPA qw(:DEFAULT :match);
 
 my $DEBUG=0;
 
@@ -147,8 +150,12 @@ sub upfile_store {
     
     chomp($env{'form.upfile'});
   
-    my $datatoken=$env{'user.name'}.'_'.$env{'user.domain'}.
-		  '_upload_'.$fname.'_'.time.'_'.$$;
+    my $datatoken;
+    if (($env{'user.name'} =~ /^$match_username$/) && ($env{'user.domain'} =~ /^$match_domain$/)) {
+        $datatoken=$env{'user.name'}.'_'.$env{'user.domain'}.
+                   '_upload_'.$fname.'_'.time.'_'.$$;
+    }
+    return if ($datatoken eq '');
     {
        my $fh=Apache::File->new('>'.$r->dir_config('lonDaemons').
                                    '/tmp/'.$datatoken.'.tmp');
@@ -158,7 +165,7 @@ sub upfile_store {
 }
 
 sub phaseone {
-    my ($r,$fn,$uname,$udom,$mode)=@_;
+    my ($r,$fn,$mode,$uname,$udom)=@_;
     my $action = '/adm/upload';
     if ($mode eq 'testbank') {
         $action = '/adm/testbank';
@@ -169,17 +176,16 @@ sub phaseone {
     # Check for file to be uploaded
     $env{'form.upfile.filename'}=~s/\\/\//g;
     $env{'form.upfile.filename'}=~s/^.*\/([^\/]+)$/$1/;
+    $env{'form.upfile.filename'}=~s/(\s+$|^\s+)//g;
     if (!$env{'form.upfile.filename'}) {
-        $r->print('<p class="LC_warning">'.&mt('No upload file specified.').'</p>');
+        $r->print('<p class="LC_warning">'.&mt('No upload file specified.').'</p>'.
+                  &earlyout($fn,$uname,$udom));
         return;
     }
 
-    $fn=~s/\/[^\/]+$//;
-    $fn=~s/([^\/])$/$1\//;
+    # Append the name of the uploaded file
     $fn.=$env{'form.upfile.filename'};
-    $fn=~s/^\///;
     $fn=~s/(\/)+/\//g;
-    #    Fn is the full path to the destination filename.
 
     # Check for illegal filename
     &Debug($r, "Filename for upload: $fn");
@@ -187,20 +193,49 @@ sub phaseone {
         $r->print('<p class="LC_warning">'.&mt('Illegal filename.').'</p>');
         return;
     }
+    # Check if quota exceeded
+    my $filesize = length($env{'form.upfile'});
+    if (!$filesize) {
+        $r->print('<p class="LC_warning">'.
+                  &mt('Unable to upload [_1]. (size = [_2] bytes)',
+                      '<span class="LC_filename">'.$env{'form.upfile.filename'}.'</span>',
+                      $filesize).'<br />'.
+                  &mt('Either the file you attempted to upload was empty, or your web browser was unable to read its contents.').'<br />'.
+                  '</p>'.
+                  &earlyout($fn,$uname,$udom));
+        return;
+    }
+    $filesize = int($filesize/1000); #expressed in kb
+    my $output = &Apache::loncommon::excess_filesize_warning($uname,$udom,'author',
+                                                             $env{'form.upfile.filename'},$filesize,'upload');
+    if ($output) {
+        $r->print($output.&earlyout($fn,$uname,$udom));
+        return;
+    }
 
+# Split part that I can change from the part that I cannot change
+    my ($fn1,$fn2)=($fn=~/^(\/priv\/[^\/]+\/[^\/]+\/)(.*)$/);
+# Check for pattern: .number.extension which is reserved for LON-CAPA versioning. 
+# Check for disallowed characters: #?&%:<>`|, and remove
+    if ($fn2 ne '') {
+        ($fn2,my $warning) = &check_filename($fn2);
+        if ($warning ne '') {
+            $r->print($warning);
+        }
+    }
     # Display additional options for upload
     # and upload button
     $r->print(
         '<form action="'.$action.'" method="post" name="fileupload">'
        .'<input type="hidden" name="phase" value="two" />'
        .'<input type="hidden" name="datatoken" value="'.&upfile_store.'" />'
-       .'<input type="hidden" name="uploaduname" value="'.$uname.'" />'
     );
     $r->print(
         &Apache::lonhtmlcommon::start_pick_box()
        .&Apache::lonhtmlcommon::row_title(&mt('Save uploaded file as'))
-       .'<span class="LC_filename">/priv/'.$uname.'/</span>'
-       .'<input type="text" size="50" name="filename" value="'.$fn.'" />'
+       .'<span class="LC_filename">'.$fn1.'</span>'
+       .'<input type="hidden" name="filename1" value="'.$fn1.'" />'
+       .'<input type="text" size="50" name="filename2" value="'.$fn2.'" />'
        .&Apache::lonhtmlcommon::row_closure()
        .&Apache::lonhtmlcommon::row_title(&mt('File Type'))
        .'<select name="filetype">'
@@ -237,7 +272,8 @@ sub phaseone {
 }
 
 sub phasetwo {
-    my ($r,$tfn,$uname,$udom,$mode)=@_;
+    my ($r,$fn,$mode)=@_;
+
     my $output;
     my $action = '/adm/upload';
     my $returnflag = '';
@@ -246,20 +282,20 @@ sub phasetwo {
     } elsif ($mode eq 'imsimport') {
         $action = '/adm/imsimport';
     }
-    my $fn='/priv/'.$uname.'/'.$tfn;
     $fn=~s/\/+/\//g;
-    &Debug($r, "Filename is ".$tfn);
-    if ($tfn) {
-	&Debug($r, "Filename for tfn = ".$tfn);
-	my $target='/home/'.$uname.'/public_html'.$tfn;
+    if ($fn) {
+	my $target= $r->dir_config('lonDocRoot').'/'.$fn;
 	&Debug($r, "target -> ".$target);
 #     target is the full filesystem path of the destination file.
 	my $base = &File::Basename::basename($fn);
 	my $path = &File::Basename::dirname($fn);
 	$base    = &HTML::Entities::encode($base,'<>&"');
-	my $url  = $path."/".$base; 
+	my $url  = $path."/".$base;
 	&Debug($r, "URL is now ".$url);
-	my $datatoken=$env{'form.datatoken'};
+	my $datatoken;
+        if ($env{'form.datatoken'} =~ /^$match_username\_$match_domain\_upload_\w*_\d+_\d+$/) {
+            $datatoken = $env{'form.datatoken'};
+        }
 	if (($fn) && ($datatoken)) {
             if ($env{'form.cancel'}) {
                 my $source=$r->dir_config('lonDaemons').'/tmp/'.$datatoken.'.tmp';
@@ -350,22 +386,33 @@ sub check_extension {
             my (%allfiles,%codebase);
             &Apache::lonnet::extract_embedded_items($target,\%allfiles,\%codebase);
             if (keys(%allfiles) > 0) {
-                my $state = <<STATE;
-    <input type="hidden" name="action"      value="upload_embedded" />
-    <input type="hidden" name="currentpath" value="$env{'form.currentpath'}" />
-    <input type="hidden" name="mode"        value="$mode" />
-    <input type="hidden" name="phase"       value="three" />
-    <input type="hidden" name="filename" value="$url" />
-STATE
-                $result .= "<h3>".&mt("Reference Warning")."</h3>".
-                           "<p>".&mt("Completed upload of the file. This file contained references to other files.")."</p>".
-                          "<p>".&mt("Please select the locations from which the referenced files are to be uploaded.")."</p>".
-                          &Apache::loncommon::ask_for_embedded_content($action,$state,\%allfiles,\%codebase,
-                                      {'error_on_invalid_names'   => 1,
-                                       'ignore_remote_references' => 1,});
-                if ($mode eq 'testbank') {
-                    $returnflag = 'embedded';
-                    $result .=  '<p>'.&mt('Or [_1]continue[_2] the testbank import without these files','<a href="javascript:document.testbankForm.submit();">','</a>').'</p>';
+                my ($currentpath) = ($url =~ m{^(.+)/[^/]+$});
+                my $state = &embedded_form_elems('upload_embedded',$url,$mode);
+                my ($embedded,$num,$pathchg) = 
+                    &Apache::loncommon::ask_for_embedded_content($action,$state,\%allfiles,
+                                                                 \%codebase,
+                                                                 {'error_on_invalid_names'   => 1,
+                                                                  'ignore_remote_references' => 1,
+                                                                  'current_path'             => $currentpath});
+                if ($embedded) {
+                    $result .= '<h3>'.&mt('Reference Warning').'</h3>';
+                    if ($num) {
+                        $result .= '<p>'.&mt('Completed upload of the file.').' '.&mt('This file contained references to other files.').'</p>'.
+                                   '<p>'.&mt('Please select the locations from which the referenced files are to be uploaded.').'</p>'.
+                                   $embedded;
+                        if ($mode eq 'testbank') {
+                            $returnflag = 'embedded';
+                            $result .=  '<p>'.&mt('Or [_1]continue[_2] the testbank import without these files.','<a href="javascript:document.testbankForm.submit();">','</a>').'</p>';
+                        }
+                    } else {
+                        $result .= '<p>'.&mt('Completed upload of the file.').'</p>'.$embedded;
+                        if ($pathchg) {
+                            if ($mode eq 'testbank') {
+                                $returnflag = 'embedded';
+                                $result .=  '<p>'.&mt('Or [_1]continue[_2] the testbank import without modifying the reference(s).','<a href="javascript:document.testbankForm.submit();">','</a>').'</p>';
+                            }
+                        }
+                    }
                 }
             }
         }
@@ -383,42 +430,177 @@ STATE
     return ($result,$returnflag);
 }
 
+sub check_filename {
+    my ($fname) = @_;
+    my $warning;
+    if ($fname =~/[#\?&%":<>`|]/) {
+        $fname =~s/[#\?&%":<>`|]//g;
+        $warning .= '<p class="LC_warning">'
+                   .&mt('Removed one or more disallowed characters from filename')
+                   .'</p>';
+    }
+    if ($fname=~ /\.(\d+)\.(\w+)$/) {
+        my $num = $1;
+        $warning .= '<p class="LC_warning">'
+                   .&mt('Bad filename [_1]','<span class="LC_filename">'.$fname.'</span>')
+                   .'<br />'
+                   .&mt('[_1](name).(number).(extension)[_2] not allowed.','<tt>','</tt>')
+                   .'<br />'
+                   .&mt('Replacing the [_1].number.[_2] with [_1]_letter.[_2] in requested filename.','<tt>','</tt>')
+                   .'</p>';
+        if ($num eq '0') {
+            $fname =~ s/\.(\d+)(\.\w+)$/_A$2/;
+        } else {
+            my $letts = '';
+            my %digletter = reverse &Apache::lonnet::letter_to_digits();
+            if ($num >= 100) {
+                $num = substr($num,-2);
+            }
+            foreach my $digit (split('',$num)) {
+                $letts .= $digletter{$digit};
+            }
+            $fname =~ s/\.(\d+)(\.\w+)$/_$letts$2/;
+        }
+    }
+    if ($fname =~/___/) {
+        $fname =~s/_+/_/g;
+        $warning .= '<p class="LC_warning">'
+                    .&mt('Changed ___ to a single _ in filename')
+                    .'</p>';
+    }
+    return ($fname,$warning);
+}
+
 sub phasethree {
     my ($r,$fn,$uname,$udom,$mode) = @_;
+
+    my $action = '/adm/upload'; 
+    if ($mode eq 'testbank') {
+        $action = '/adm/testbank';
+    } elsif ($mode eq 'imsimport') {
+        $action = '/adm/imsimport';
+    }
+    my $url_root = "/priv/$udom/$uname";
+    my $dir_root = $r->dir_config('lonDocRoot').$url_root;
+    my $path = &File::Basename::dirname($fn);
+    $path =~ s{^\Q$url_root\E}{};
+    my $dirpath = $url_root.$path.'/';
+    $dirpath=~s{/+}{/}g;
+    my $filename = &HTML::Entities::encode($env{'form.filename'},'<>&"');
+    my $state = &embedded_form_elems('modify_orightml',$filename,$mode).
+                '<input type="hidden" name="phase" value="four" />';
+    my ($result,$returnflag) = 
+        &Apache::loncommon::upload_embedded($mode,$path,$uname,$udom,
+                                            $dir_root,$url_root,undef,
+                                            undef,undef,$state,$action);
+    if ($mode ne 'imsimport' && $mode ne 'testbank') {
+        $result .= '<br /><h3><a href="'.$fn.'">'.
+                  &mt('View main file').'</a></h3>'.
+                  '<h3><a href="'.$dirpath.'">'.
+                  &mt('Back to Directory').'</a></h3><br />';
+    }
+    return ($result,$returnflag);
+}
+
+sub embedded_form_elems {
+    my ($action,$filename,$mode) = @_;
+    return <<STATE;
+    <input type="hidden" name="action" value="$action" />
+    <input type="hidden" name="mode" value="$mode" />
+    <input type="hidden" name="filename" value="$filename" />
+STATE
+}
+
+sub phasefour {
+    my ($r,$fn,$uname,$udom,$mode) = @_;
+
+    my $action = '/adm/upload';
+    if ($mode eq 'testbank') {
+        $action = '/adm/testbank';
+    } elsif ($mode eq 'imsimport') {
+        $action = '/adm/imsimport';
+    }
     my $result;
-    my $dir_root = '/home/'.$uname.'/public_html';
-    my $url_root = '/priv/'.$uname;
-    my $base = &File::Basename::basename($fn);
+    my $url_root = "/priv/$udom/$uname";
+    my $dir_root = $r->dir_config('lonDocRoot').$url_root;
     my $path = &File::Basename::dirname($fn);
-    $result = &Apache::loncommon::upload_embedded($mode,$path,$uname,$udom,
-                                                  $dir_root,$url_root);
+    $path =~ s{^\Q$url_root\E}{};
+    my $dirpath = $url_root.$path.'/';
+    $dirpath=~s{/+}{/}g;
+    my $outcome = 
+        &Apache::loncommon::modify_html_refs($mode,$path,$uname,$udom,$dir_root);
+    $result .= $outcome;
     if ($mode ne 'imsimport' && $mode ne 'testbank') {
-        $result = '<br /><font size="+2"><a href="'.$url_root.$fn.'">'.
-                  &mt('View main file').'</a></font>'.
-                  '<br /><font size="+2"><a href="'.$url_root.$path.'">'.
-                  &mt('Back to Directory').'</a></font><br />';
+        $result .= '<br /><h3><a href="'.$fn.'">'.
+                  &mt('View main file').'</a></h3>'.
+                  '<h3><a href="'.$dirpath.'">'.
+                  &mt('Back to Directory').'</a></h3><br />';
     }
     return $result;
 }
 
+sub earlyout {
+    my ($fn,$uname,$udom) = @_;
+    if ($fn =~ m{^(/priv/$udom/$uname(?:.*)/)[^/]*}) {
+        return &Apache::lonhtmlcommon::actionbox(
+               ['<a href="'.$1.'">'.&mt('Return to Directory').'</a>']);
+    }
+    return;
+}
+
 # ---------------------------------------------------------------- Main Handler
 sub handler {
 
     my $r=shift;
-
-    my $uname;
-    my $udom;
     my $javascript = '';
-#
-# phase two: re-attach user
-#
-    if ($env{'form.uploaduname'}) {
-	$env{'form.filename'}='/priv/'.$env{'form.uploaduname'}.'/'.
-	    $env{'form.filename'};
+    my $fn;
+    my $warning;
+
+    if ($env{'form.filename1'}) {
+        my $fn1 = $env{'form.filename1'};
+        my $fn2 = $env{'form.filename2'};
+        $fn2 =~ s/(\s+$|^\s+)//g;
+        $fn2 =~ s/\/+/\//g;
+        ($fn2,$warning) = &check_filename($fn2);
+        $fn = $fn1.$fn2;
+    } else {
+        $fn = $env{'form.filename'};
+    }
+    $fn=~s/\/+/\//g;
+    if ($fn =~ m{/\.\./}) {
+        $warning .= '<p class="LC_warning">'
+                   .&mt('Path modified as a result of one or more instances of /../')
+                   .'</p>';
+        while ($fn =~ m{/\.\./}) {
+            $fn =~ s{/[^/]+/\.\./}{/}g;
+        }
+    }
+
+    unless ($fn) {
+        $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
+                       ' unspecified filename for upload', $r->filename);
+        return HTTP_NOT_FOUND;
     }
 
+    my ($uname,$udom)=&Apache::lonnet::constructaccess($fn);
+
+    unless (($uname) && ($udom)) {
+        $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
+                       ' trying to upload file '.$fn.
+                       ' - not authorized',
+                       $r->filename);
+        return HTTP_NOT_ACCEPTABLE;
+    }
+
+# ----------------------------------------------------------- Start page output
+
+    &Apache::loncommon::content_type($r,'text/html');
+    $r->send_http_header;
+
     unless ($env{'form.phase'} eq 'two') {
-        $javascript = qq|
+        $javascript = <<"ENDJS";
+<script type="text/javascript">
+// <![CDATA[
 function verifyForm() {
     var mode = document.fileupload.filetype.options[document.fileupload.filetype.selectedIndex].value
     if (mode == "testbank") {
@@ -432,73 +614,64 @@ function verifyForm() {
     }
     document.fileupload.submit();
 }
-	|;
-    }
-    ($uname,$udom)=
-	&Apache::loncacc::constructaccess($env{'form.filename'},
-					  $r->dir_config('lonDefDomain'));
-
-    unless (($uname) && ($udom)) {
-	$r->log_reason($uname.' at '.$udom.
-		       ' trying to publish file '.$env{'form.filename'}.
-		       ' - not authorized', 
-		       $r->filename); 
-	return HTTP_NOT_ACCEPTABLE;
+// ]]>
+</script>
+ENDJS
     }
-    
-    my $fn;
-    if ($env{'form.filename'}) {
-	$fn=$env{'form.filename'};
-	$fn=~s/^https?\:\/\/[^\/]+\///;
-	$fn=~s/^\///;
-	$fn=~s{(~|priv/)($LONCAPA::username_re)}{};
-	$fn=~s/\/+/\//g;
-    } else {
-	$r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
-		       ' unspecified filename for upload', $r->filename); 
-	return HTTP_NOT_FOUND;
-    }
-
-# ----------------------------------------------------------- Start page output
-
 
-    &Apache::loncommon::content_type($r,'text/html');
-    $r->send_http_header;
-
-   $javascript = "<script type=\"text/javascript\">\n//<!--\n".
-	$javascript."\n// --></script>\n";
+    my $londocroot = $r->dir_config('lonDocRoot');
+    my $trailfile = $fn;
+    $trailfile =~ s{^/(priv/)}{$londocroot/$1};
 
     # Breadcrumbs
-    my $brcrum = [{'href' => &Apache::loncommon::authorspace(),
-                   'text' => 'Construction Space'},
+    my $text = 'Authoring Space';
+    my $href = &Apache::loncommon::authorspace($fn);
+    my $crsauthor;
+    if ($env{'request.course.id'}) {
+        my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+        my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+        if ($href eq "/priv/$cdom/$cnum/") {
+            $text = 'Course Authoring Space';
+            $crsauthor = 1;
+        }
+    }
+    my $brcrum = [{'href' => $href,
+                   'text' => $text},
                   {'href' => '/adm/upload',
-                   'text' => 'Upload file to Construction Space'}];
-    $r->print(&Apache::loncommon::start_page('Upload file to Construction Space',
+                   'text' => 'Upload file to '.$text}];
+    $r->print(&Apache::loncommon::start_page('Upload file to '.$text,
                                              $javascript,
                                              {'bread_crumbs' => $brcrum,})
              .&Apache::loncommon::head_subbox(
-                &Apache::loncommon::CSTR_pageheader())
+                &Apache::loncommon::CSTR_pageheader($trailfile))
     );
-  
-    if (($uname ne $env{'user.name'}) || ($udom ne $env{'user.domain'})) {
-        $r->print('<p class="LC_warning">'
-                 .&mt('Co-Author [_1]',$uname.':'.$udom)
-                 .'</p>'
-        );
-    }
 
-    if ($env{'form.phase'} eq 'three') {
-        my $output = &phasethree($r,$fn,$uname,$udom,'author');
+    unless ($crsauthor) {
+        if (($uname ne $env{'user.name'}) || ($udom ne $env{'user.domain'})) {
+            $r->print('<p class="LC_info">'
+                     .&mt('Co-Author [_1]',$uname.':'.$udom)
+                     .'</p>'
+            );
+        }
+    }
+    if ($warning) {
+        $r->print($warning);
+    }
+    if ($env{'form.phase'} eq 'four') {
+        my $output = &phasefour($r,$fn,$uname,$udom,'author');
+        $r->print($output);
+    } elsif ($env{'form.phase'} eq 'three') {
+        my ($output,$rtnflag) = &phasethree($r,$fn,$uname,$udom,'author');
         $r->print($output);
     } elsif ($env{'form.phase'} eq 'two') {
-	my ($output,$returnflag) = &phasetwo($r,$fn,$uname,$udom);
+	my ($output,$returnflag) = &phasetwo($r,$fn);
         $r->print($output);
     } else {
-	&phaseone($r,$fn,$uname,$udom);
+	&phaseone($r,$fn,undef,$uname,$udom);
     }
 
     $r->print(&Apache::loncommon::end_page());
-    return OK;  
+    return OK;
 }
 
 1;