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Diff for /loncom/publisher/lonupload.pm between versions 1.24 and 1.39

version 1.24, 2003/11/08 11:13:50 version 1.39, 2008/11/10 13:20:04
Line 28 Line 28
 #  #
 ###  ###
   
   =head1 NAME
   
   Apache::lonupload - upload files into construction space
   
   =head1 SYNOPSIS
   
   Invoked by /etc/httpd/conf/srm.conf:
   
    <Location /adm/upload>
    PerlAccessHandler       Apache::lonacc
    SetHandler perl-script
    PerlHandler Apache::lonupload
    ErrorDocument     403 /adm/login
    ErrorDocument     404 /adm/notfound.html
    ErrorDocument     406 /adm/unauthorized.html
    ErrorDocument  500 /adm/errorhandler
    </Location>
   
   =head1 INTRODUCTION
   
   This module uploads a file sitting on a client computer into 
   library server construction space.
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   =head1 HANDLER SUBROUTINE
   
   This routine is called by Apache and mod_perl.
   
   =over 4
   
   =item *
   
   Initialize variables
   
   =item *
   
   Start page output
   
   =item *
   
   output relevant interface phase (phaseone or phasetwo or phasethree)
   
   =item *
   
   (phase one is to specify upload file; phase two is to handle conditions
   subsequent to specification--like overwriting an existing file; phase three
   is to handle processing of secondary uploads - of embedded objects in an
   html file).
   
   =back
   
   =head1 OTHER SUBROUTINES
   
   =over 4
   
   =item *
   
   phaseone() : Interface for specifying file to upload.
   
   =item *
   
   phasetwo() : Interface for handling post-conditions about uploading (such
   as overwriting an existing file).
   
   =item *
   
   phasethree() : Interface for handling secondary uploads of embedded objects
   in an html file.
   
   =item *
   
   upfile_store() : Store contents of uploaded file into temporary space.  Invoked
   by phaseone subroutine.
   
   =item *
   
   check_extension() : Checks if filename extension is permitted and checks type
    of file - if html file, calls parser to check for embedded objects.
    Invoked by phasetwo subroutine.
   
   =back
   
   =cut
   
 package Apache::lonupload;  package Apache::lonupload;
   
 use strict;  use strict;
Line 37  use File::Basename; Line 123  use File::Basename;
 use Apache::Constants qw(:common :http :methods);  use Apache::Constants qw(:common :http :methods);
 use Apache::loncacc;  use Apache::loncacc;
 use Apache::loncommon();  use Apache::loncommon();
 use Apache::Log();  
 use Apache::lonnet;  use Apache::lonnet;
 use HTML::Entities();  use HTML::Entities();
 use Apache::lonlocal;  use Apache::lonlocal;
   use Apache::lonnet;
   use LONCAPA();
   
 my $DEBUG=0;  my $DEBUG=0;
   
 sub Debug {  sub Debug {
         # Put out the indicated message but only if DEBUG is true.
     # Marshall the parameters.  
     
     my $r       = shift;  
     my $log     = $r->log;  
     my $message = shift;  
     
     # Put out the indicated message butonly if DEBUG is false.  
     
     if ($DEBUG) {      if ($DEBUG) {
  $log->debug($message);   my ($r,$message) = @_;
    $r->log_reason($message);
     }      }
 }  }
   
 sub upfile_store {  sub upfile_store {
     my $r=shift;      my $r=shift;
   
     my $fname=$ENV{'form.upfile.filename'};      my $fname=$env{'form.upfile.filename'};
     $fname=~s/\W//g;      $fname=~s/\W//g;
           
     chomp($ENV{'form.upfile'});      chomp($env{'form.upfile'});
       
     my $datatoken=$ENV{'user.name'}.'_'.$ENV{'user.domain'}.      my $datatoken=$env{'user.name'}.'_'.$env{'user.domain'}.
   '_upload_'.$fname.'_'.time.'_'.$$;    '_upload_'.$fname.'_'.time.'_'.$$;
     {      {
        my $fh=Apache::File->new('>'.$r->dir_config('lonDaemons').         my $fh=Apache::File->new('>'.$r->dir_config('lonDaemons').
                                    '/tmp/'.$datatoken.'.tmp');                                     '/tmp/'.$datatoken.'.tmp');
        print $fh $ENV{'form.upfile'};         print $fh $env{'form.upfile'};
     }      }
     return $datatoken;      return $datatoken;
 }  }
   
   
 sub phaseone {  sub phaseone {
     my ($r,$fn,$uname,$udom)=@_;      my ($r,$fn,$uname,$udom,$mode)=@_;
     $ENV{'form.upfile.filename'}=~s/\\/\//g;      my $action = '/adm/upload';
     $ENV{'form.upfile.filename'}=~s/^.*\/([^\/]+)$/$1/;      if ($mode eq 'testbank') {
     if ($ENV{'form.upfile.filename'}) {          $action = '/adm/testbank';
       } elsif ($mode eq 'imsimport') {
           $action = '/adm/imsimport';
       }
       $env{'form.upfile.filename'}=~s/\\/\//g;
       $env{'form.upfile.filename'}=~s/^.*\/([^\/]+)$/$1/;
       if ($env{'form.upfile.filename'}) {
  $fn=~s/\/[^\/]+$//;   $fn=~s/\/[^\/]+$//;
  $fn=~s/([^\/])$/$1\//;   $fn=~s/([^\/])$/$1\//;
  $fn.=$ENV{'form.upfile.filename'};   $fn.=$env{'form.upfile.filename'};
  $fn=~s/^\///;   $fn=~s/^\///;
  $fn=~s/(\/)+/\//g;   $fn=~s/(\/)+/\//g;
   
Line 94  sub phaseone { Line 179  sub phaseone {
   
  &Debug($r, "Filename for upload: $fn");   &Debug($r, "Filename for upload: $fn");
  if (($fn) && ($fn!~/\/$/)) {   if (($fn) && ($fn!~/\/$/)) {
     $r->print('<form action="/adm/upload" method="post">'.      $r->print('<form action="'.$action.'" method="post" name="fileupload">'.
       '<input type="hidden" name="phase" value="two" />'.        '<input type="hidden" name="phase" value="two" />'.
       '<input type="hidden" name="datatoken" value="'.        '<input type="hidden" name="datatoken" value="'.
       &upfile_store.'" />'.        &upfile_store.'" />'.
       '<input type="hidden" name="uploaduname" value="'.$uname.        '<input type="hidden" name="uploaduname" value="'.$uname.
       '" />'.&mt('Store uploaded file as ').        '" />'.&mt('Save uploaded file as ').
       "<tt>/priv/$uname/</tt>".                        "<span class='LC_filename'>/priv/$uname/</span>".
       '<input type="text" size="50" name="filename" value="'.$fn.                        '<input type="text" size="50" name="filename" value="'.$fn.
       '" /><br />'.                        '" /><br />'.
       '<input type="submit" value="'.&mt('Store').'" /></form>');        '<br />'.&mt('Choose file type:').'
   <select name="filetype">
    <option value="standard" selected>'.&mt('Regular file').'
    <option value="testbank">'.&mt('Testbank file').'
    <option value="imsimport">'.&mt('IMS package').'
   </select>'.&Apache::loncommon::help_open_topic("Uploading_File_Options").'
   <br />
   <br />
   ');
               $r->print('<input type="button" value="'.&mt('Save').'" onClick="javascript:verifyForm()"/></form>');
     # Check for bad extension and warn user      # Check for bad extension and warn user
     if ($fn=~/\.(\w+)$/ &&       if ($fn=~/\.(\w+)$/ && 
  (&Apache::loncommon::fileembstyle($1) eq 'hdn')) {   (&Apache::loncommon::fileembstyle($1) eq 'hdn')) {
  $r->print('<font color="red">'.&mt('The extension on this file,').   $r->print('<span class="LC_error">'.&mt('The extension on this file,').
   ' "'.$1.'"'.&mt(', is reserved internally by LON-CAPA.').    ' "'.$1.'"'.&mt(', is reserved internally by LON-CAPA.').
   ' <br />'.&mt('Please change the extension.').'</font>');    ' <br />'.&mt('Please change the extension.').'</span>');
     } elsif($fn=~/\.(\w+)$/ &&       } elsif($fn=~/\.(\w+)$/ && 
     !defined(&Apache::loncommon::fileembstyle($1))) {      !defined(&Apache::loncommon::fileembstyle($1))) {
  $r->print('<font color="red">'.&mt('The extension on this file,').   $r->print('<span class="LC_error">'.&mt('The extension on this file,').
   ' "'.$1.'"'.&mt(', is not recognized by LON-CAPA.').    ' "'.$1.'"'.&mt(', is not recognized by LON-CAPA.').
   ' <br />'.&mt('Please change the extension.').    ' <br />'.&mt('Please change the extension.').
   '</font>');    '</span>');
     }      }
  } else {   } else {
     $r->print('<font color="red">'.&mt('Illegal filename.').'</font>');      $r->print('<span class="LC_error">'.&mt('Illegal filename.').'</span>');
  }   }
     } else {      } else {
  $r->print('<font color="red">'.&mt('No upload file specified.').'</font>');   $r->print('<span class="LC_error">'.&mt('No upload file specified.').'</span>');
     }      }
 }  }
   
 sub phasetwo {  sub phasetwo {
     my ($r,$tfn,$uname,$udom)=@_;      my ($r,$tfn,$uname,$udom,$mode)=@_;
       my $output;
       my $action = '/adm/upload';
       my $returnflag = '';
       if ($mode eq 'testbank') {
           $action = '/adm/testbank';
       } elsif ($mode eq 'imsimport') {
           $action = '/adm/imsimport';
       }
     my $fn='/priv/'.$uname.'/'.$tfn;      my $fn='/priv/'.$uname.'/'.$tfn;
     $fn=~s/\/+/\//g;      $fn=~s/\/+/\//g;
     &Debug($r, "Filename is ".$tfn);      &Debug($r, "Filename is ".$tfn);
Line 137  sub phasetwo { Line 239  sub phasetwo {
 #     target is the full filesystem path of the destination file.  #     target is the full filesystem path of the destination file.
  my $base = &File::Basename::basename($fn);   my $base = &File::Basename::basename($fn);
  my $path = &File::Basename::dirname($fn);   my $path = &File::Basename::dirname($fn);
  $base    = &HTML::Entities::encode($base);   $base    = &HTML::Entities::encode($base,'<>&"');
  my $url  = $path."/".$base;    my $url  = $path."/".$base; 
  &Debug($r, "URL is now ".$url);   &Debug($r, "URL is now ".$url);
  my $datatoken=$ENV{'form.datatoken'};   my $datatoken=$env{'form.datatoken'};
  if (($fn) && ($datatoken)) {   if (($fn) && ($datatoken)) {
     if ((-e $target) && ($ENV{'form.override'} ne 'Yes')) {              if ($env{'form.cancel'}) {
  $r->print('<form action="/adm/upload" method="post">'.                  my $source=$r->dir_config('lonDaemons').'/tmp/'.$datatoken.'.tmp';
   &mt('File').' <tt>'.$fn.'</tt> '.                  my $dirpath=$path.'/';
   &mt('exists. Overwrite?').' '.                  $dirpath=~s/\/+/\//g;
                   $output .= &mt('Upload cancelled.').'<br /><font size="+2"><a href="'.$dirpath.'">'.
                             &mt('Back to Directory').'</a></font>';
       } elsif ((-e $target) && (!$env{'form.override'})) {
    $output .= '<form action="'.$action.'" method="post">'.
     &mt('File [_1] exists. Overwrite?','<span class="LC_filename">'.$fn.'</span>').
   '<input type="hidden" name="phase" value="two" />'.    '<input type="hidden" name="phase" value="two" />'.
   '<input type="hidden" name="filename" value="'."$url".'" />'.    '<input type="hidden" name="filename" value="'.$url.'" />'.
   '<input type="hidden" name="datatoken" value="'.$datatoken.'" />'.    '<input type="hidden" name="datatoken" value="'.$datatoken.'" />'.
   '<input type="submit" name="override" value="'.&mt('Yes').'" /></form>');    '<input type="submit" name="override" value="'.&mt('Yes').'" />'.
     } else {                            '<input type="submit" name="cancel" value="'.&mt('Cancel').'" />'.
                             '</form>';
               } else {
  my $source=$r->dir_config('lonDaemons').'/tmp/'.$datatoken.'.tmp';   my $source=$r->dir_config('lonDaemons').'/tmp/'.$datatoken.'.tmp';
    my $dirpath=$path.'/';
    $dirpath=~s/\/+/\//g;
  # Check for bad extension and disallow upload   # Check for bad extension and disallow upload
  if ($fn=~/\.(\w+)$/ &&                   my $result;
     (&Apache::loncommon::fileembstyle($1) eq 'hdn')) {                  ($result,$returnflag) = &check_extension($fn,$mode,$source,$target,$action,$dirpath,$url);
     $r->print(&mt('File').' <tt>'.$fn.'</tt> '.                  $output .= $result;
       &mt('could not be copied.').'<br />'.  
       '<font color="red">'.  
       &mt('The extension on this file is reserved internally by LON-CAPA.').  
       '</font>');  
     $r->print('<br /><font size=+2><a href="'.$path.'">'.  
       &mt('Back to Directory').'</a></font>');  
  } elsif ($fn=~/\.(\w+)$/ &&   
  !defined(&Apache::loncommon::fileembstyle($1))) {  
     $r->print(&mt('File').' <tt>'.$fn.'</tt> '.  
       &mt('could not be copied.').'<br />'.  
       '<font color="red">'.  
       &mt('The extension on this file is not recognized by LON-CAPA.').  
       '</font>');  
     $r->print('<br /><font size="+2"><a href="'.$path.'">'.  
       &mt('Back to Directory').'</a></font>');  
  } elsif (-d $target) {  
     $r->print('File <tt>'.$fn.'</tt> could not be copied.<br />'.  
       '<font color="red">'.  
       &mt('The target is an existing directory.').  
       '</font><br />');  
     $r->print('<font size="+2"><a href="'.$path.'">'.  
       &mt('Back to Directory').'</a></font>');  
  } elsif (copy($source,$target)) {  
     chmod(0660, $target); # Set permissions to rw-rw---.  
     $r->print(&mt('File copied.'));  
     $r->print('<br /><font size="+2"><a href="'.$url.'">'.  
       &mt('View file').'</a></font>');  
     $r->print('<br /><font size="+2"><a href="'.$path.'">'.  
       &mt('Back to Directory').'</a></font><br />');  
  } else {  
     $r->print('Failed to copy: '.$!);  
     $r->print('<br /><font size="+2"><a href="'.$path.'">'.  
       &mt('Back to Directory').'</a></font>');  
  }  
     }      }
  } else {   } else {
     $r->print('<font size="+1" color="red">'.      $output .= '<span class="LC_error">'.
       &mt('Please use browser "Back" button and pick a filename').        &mt('Please use browser "Back" button and pick a filename').
       '</font><br />');        '</span><br />';
  }   }
     } else {      } else {
  $r->print('<font size=+1 color=red>'.   $output .= '<span class="LC_error">'.
   &mt('Please use browser "Back" button and pick a filename').     &mt('Please use browser "Back" button and pick a filename').
   '</font><br />>');     '</span><br />';
     }      }
       return ($output,$returnflag);
   }
   
   sub check_extension {
       my ($fn,$mode,$source,$target,$action,$dirpath,$url) = @_;
       my ($result,$returnflag);
       # Check for bad extension and disallow upload
       if ($fn=~/\.(\w+)$/ &&
           (&Apache::loncommon::fileembstyle($1) eq 'hdn')) {
           $result .= &mt('File [_1] could not be copied.',
                         '<span class="LC_filename">'.$fn.'</span> ').
                     '<br /><span class="LC_error">'.
                     &mt('The extension on this file is reserved internally by LON-CAPA.').
                     '</span>';
       } elsif ($fn=~/\.(\w+)$/ &&
                !defined(&Apache::loncommon::fileembstyle($1))) {
           $result .= &mt('File [_1] could not be copied.',
                         '<span class="LC_filename">'.$fn.'</span> ').
                     '<br /><span class="LC_error">'.
                     &mt('The extension on this file is not recognized by LON-CAPA.').
                     '</span>';
       } elsif (-d $target) {
           $result .= &mt('File [_1] could not be copied.',
                         '<span class="LC_filename">'.$fn.'</span>').
                     '<br /><span class="LC_error">'.
                     &mt('The target is an existing directory.').
                     '</span>';
       } elsif (copy($source,$target)) {
           chmod(0660, $target); # Set permissions to rw-rw---.
           if ($mode eq 'testbank' || $mode eq 'imsimport') {
               $returnflag = 'ok';
               $result .= &mt('Your file - [_1] - was uploaded successfully',$fn).'<br /><br />';
           } else {
               $result .= &mt('File copied.').'<br />';
           }
           # Check for embedded objects.
           my (%allfiles,%codebase);
           my ($text,$header,$css,$js);
           if (($mode ne 'imsimport') && ($target =~ /\.(htm|html|shtml)$/i)) {
               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';
                       $result .=  '<p>'.&mt('Or [_1]continue[_2] the testbank import without these files','<a href="javascript:document.testbankForm.submit();">','</a>').'</p>';
                   }
               }
           }
           if (($mode ne 'imsimport') && ($mode ne 'testbank')) {
               $result .= '<br /><font size="+2"><a href="'.$url.'">'.
                           &mt('View file').'</a></font>';
           }
       } else {
           $result .= &mt('Failed to copy: [_1].',$!);
       }
       if ($mode ne 'imsimport' && $mode ne 'testbank') {
           $result .= '<br /><font size="+2"><a href="'.$dirpath.'">'.
                      &mt('Back to Directory').'</a></font><br />';
       }
       return ($result,$returnflag);
   }
   
   sub phasethree {
       my ($r,$fn,$uname,$udom,$mode) = @_;
       my $result;
       my $dir_root = '/home/'.$uname.'/public_html';
       my $url_root = '/priv/'.$uname;
       my $base = &File::Basename::basename($fn);
       my $path = &File::Basename::dirname($fn);
       $result = &Apache::loncommon::upload_embedded($mode,$path,$uname,$udom,
                                                     $dir_root,$url_root);
       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 />';
       }
       return $result;
 }  }
   
 # ---------------------------------------------------------------- Main Handler  # ---------------------------------------------------------------- Main Handler
Line 210  sub handler { Line 378  sub handler {
   
     my $uname;      my $uname;
     my $udom;      my $udom;
       my $javascript = '';
 #  #
 # phase two: re-attach user  # phase two: re-attach user
 #  #
     if ($ENV{'form.uploaduname'}) {      if ($env{'form.uploaduname'}) {
  $ENV{'form.filename'}='/priv/'.$ENV{'form.uploaduname'}.'/'.   $env{'form.filename'}='/priv/'.$env{'form.uploaduname'}.'/'.
     $ENV{'form.filename'};      $env{'form.filename'};
     }      }
 #  
   
       unless ($env{'form.phase'} eq 'two') {
           $javascript = qq|
   function verifyForm() {
       var mode = document.fileupload.filetype.options[document.fileupload.filetype.selectedIndex].value
       if (mode == "testbank") {
           document.fileupload.action = "/adm/testbank";
       }
       if (mode == "imsimport") {
           document.fileupload.action = "/adm/imsimport";
       }
       if (mode == "standard") {
           document.fileupload.action = "/adm/upload";
       }
       document.fileupload.submit();
   }
    |;
       }
     ($uname,$udom)=      ($uname,$udom)=
  &Apache::loncacc::constructaccess($ENV{'form.filename'},   &Apache::loncacc::constructaccess($env{'form.filename'},
   $r->dir_config('lonDefDomain'));    $r->dir_config('lonDefDomain'));
   
     unless (($uname) && ($udom)) {      unless (($uname) && ($udom)) {
  $r->log_reason($uname.' at '.$udom.   $r->log_reason($uname.' at '.$udom.
        ' trying to publish file '.$ENV{'form.filename'}.         ' trying to publish file '.$env{'form.filename'}.
        ' - not authorized',          ' - not authorized', 
        $r->filename);          $r->filename); 
  return HTTP_NOT_ACCEPTABLE;   return HTTP_NOT_ACCEPTABLE;
     }      }
           
     my $fn;      my $fn;
     if ($ENV{'form.filename'}) {      if ($env{'form.filename'}) {
  $fn=$ENV{'form.filename'};   $fn=$env{'form.filename'};
  $fn=~s/^http\:\/\/[^\/]+\///;   $fn=~s/^http\:\/\/[^\/]+\///;
  $fn=~s/^\///;   $fn=~s/^\///;
  $fn=~s/(\~|priv\/)(\w+)//;   $fn=~s{(~|priv/)($LONCAPA::username_re)}{};
  $fn=~s/\/+/\//g;   $fn=~s/\/+/\//g;
     } else {      } else {
  $r->log_reason($ENV{'user.name'}.' at '.$ENV{'user.domain'}.   $r->log_reason($env{'user.name'}.' at '.$env{'user.domain'}.
        ' unspecified filename for upload', $r->filename);          ' unspecified filename for upload', $r->filename); 
  return HTTP_NOT_FOUND;   return HTTP_NOT_FOUND;
     }      }
Line 249  sub handler { Line 435  sub handler {
     &Apache::loncommon::content_type($r,'text/html');      &Apache::loncommon::content_type($r,'text/html');
     $r->send_http_header;      $r->send_http_header;
   
     $r->print('<html><head><title>LON-CAPA Construction Space</title></head>');     $javascript = "<script type=\"text/javascript\">\n//<!--\n".
    $javascript."\n// --></script>\n";
   
     $r->print(&Apache::loncommon::bodytag('Upload file to Construction Space'));      $r->print(&Apache::loncommon::start_page('Upload file to Construction Space',
        $javascript));
       
     if (($uname ne $ENV{'user.name'}) || ($udom ne $ENV{'user.domain'})) {      if (($uname ne $env{'user.name'}) || ($udom ne $env{'user.domain'})) {
  $r->print('<h3><font color=red>'.&mt('Co-Author').': '.$uname.   $r->print('<h3><span class="LC_error">'.&mt('Co-Author').': '.$uname.
   &mt(' at ').$udom.'</font></h3>');    &mt(' at ').$udom.'</span></h3>');
     }      }
   
     if ($ENV{'form.phase'} eq 'two') {      if ($env{'form.phase'} eq 'three') {
  &phasetwo($r,$fn,$uname,$udom);          my $output = &phasethree($r,$fn,$uname,$udom,'author');
           $r->print($output);
       } elsif ($env{'form.phase'} eq 'two') {
    my ($output,$returnflag) = &phasetwo($r,$fn,$uname,$udom);
           $r->print($output);
     } else {      } else {
  &phaseone($r,$fn,$uname,$udom);   &phaseone($r,$fn,$uname,$udom);
     }      }
   
     $r->print('</body></html>');      $r->print(&Apache::loncommon::end_page());
     return OK;        return OK;  
 }  }
   
 1;  1;
 __END__  __END__
   
 =head1 NAME  
   
 Apache::lonupload - upload files into construction space  
   
 =head1 SYNOPSIS  
   
 Invoked by /etc/httpd/conf/srm.conf:  
   
  <Location /adm/upload>  
  PerlAccessHandler       Apache::lonacc  
  SetHandler perl-script  
  PerlHandler Apache::lonupload  
  ErrorDocument     403 /adm/login  
  ErrorDocument     404 /adm/notfound.html  
  ErrorDocument     406 /adm/unauthorized.html  
  ErrorDocument  500 /adm/errorhandler  
  </Location>  
   
 =head1 INTRODUCTION  
   
 This module uploads a file sitting on a client computer into   
 library server construction space.  
   
 This is part of the LearningOnline Network with CAPA project  
 described at http://www.lon-capa.org.  
   
 =head1 HANDLER SUBROUTINE  
   
 This routine is called by Apache and mod_perl.  
   
 =over 4  
   
 =item *  
   
 Initialize variables  
   
 =item *  
   
 Start page output  
   
 =item *  
   
 output relevant interface phase (phaseone or phasetwo)  
   
 =item *  
   
 (phase one is to specify upload file; phase two is to handle conditions  
 subsequent to specification--like overwriting an existing file)  
   
 =back  
   
 =head1 OTHER SUBROUTINES  
   
 =over 4  
   
 =item *  
   
 phaseone() : Interface for specifying file to upload.  
   
 =item *  
   
 phasetwo() : Interface for handling post-conditions about uploading (such  
 as overwriting an existing file).  
   
 =item *  
   
 upfile_store() : Store contents of uploaded file into temporary space.  Invoked  
 by phaseone subroutine.  
   
 =back  
   
 =cut  
Removed from v.1.24  
changed lines
  Added in v.1.39

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