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James Robertson http://www.r0bertson.co.uk

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Upload a file using Ajax

This code is categorised as Ajax because it "fits within my definition of Ajax" as explained from the Ajax File Upload [openjs.com] article.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <title>File upload</title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <script type="text/javascript">
    //<![CDATA[
      function init() {
	document.getElementById('file_upload_form').onsubmit=function() {
                                  //'upload_target' is the name of the iframe
	  document.getElementById('file_upload_form').target = 'upload_target'; 
	  }
  }
  window.onload=init;
    //]]>
    </script>
  </head>
  <body>
    <form id="file_upload_form" method="post" enctype="multipart/form-data" action="/p/file_upload.cgi">
    <input name="myfile" id="myfile" size="27" type="file" /><br />
    <input type="submit" name="action" value="Upload" /><br />
    <iframe id="upload_target" name="upload_target" src="" style="width:0;height:0;border:0px solid #fff;"></iframe>
    </form>
  </body>
</html>
to form ajax upload file javscript by jrobertson on Feb 23, 2008

Upload a file using Ruby

The following code was used to upload an image file to the web server. Source code origin: Ruby Language Stuff | mod_ruby File upload scripts [zytrax.com]

file: file_upload.cgi
#!/usr/bin/ruby

# ruby script fragment
require 'cgi'
require 'stringio'

cgi = CGI.new()  # New CGI object
puts "Content-Type: text/plain"
puts
print '<result>'

# get uri of tx'd file (in tmp normally)
tmpfile = cgi.params['myfile'].first.path

# OR (functionally the same)
tmpfile = cgi.params['myfile'][0].path

# create a Tempfile reference
fromfile = cgi.params['myfile'].first

#displays the original file name as supplied in the form
puts fromfile.original_filename

# displays the content (mime) type e.g. text/html
puts fromfile.content_type

# create output file reference as original filename in our chosen directory
tofile = '/var/www/yourdomain.com/htdocs/r/'+fromfile.original_filename

# copy the file
# note the untaint prevents a security error
# cgi sets up an StringIO object if file < 10240
# or a Tempfile object following works for both
File.open(tofile.untaint, 'w') { |file| file << fromfile.read}
# when the page finishes the Tempfile/StringIO!) thing is deleted automatically

print '</result>'

file: file_upload.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <title>File upload</title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
  </head>
  <body>
    <form name='fileupload' enctype="multipart/form-data" 
    action='/p/file_upload.cgi' method='post'>
    <input type='file' name='myfile' size="40" />
    <input type='submit' value"Send it"/>
    </form>
  </body>
</html>
to ruby form web cgi page upload file by jrobertson on Feb 23, 2008

Mark directories to be deleted based on their date-stamp

This Ruby code selects file directories which are older than a certain date and outputs an XML file naming all the directories to be removed. It does this by reading a directory listing formatted within the XML file 'dir.xml', all directories are named by a date-stamp, which is used to determine if the directory should be removed.

This example is used to maintain the webcamera (named 'pear') which saves it's images to a date-stamped directory daily. Any directory which is older than 14 days will be marked for deletion.

  def directory_housekeeping()
    lifespan = 14
    format_mask = 'm_d_y'
    separator = format_mask.match(/[\_*\-]/).to_s
    
    earliest_date = Time.now + (60 * 60 * 24) * -lifespan
    cut_off_date = Date.new(y=earliest_date.year,m=earliest_date.month,d=earliest_date.day)
        
    a_format = Array.new
    a_format[0] = format_mask.match(/^[y,m,d]*/).to_s
    a_format[1] = format_mask.match(separator + '[y,m,d]*').to_s.gsub(separator,'')
    a_format[2] = format_mask.match('[y,m,d]$').to_s
    
    file = File.new('../housekeeping/webcam_pear/dir.xml')
    ddoc = REXML::Document.new(file)
    file.close
    
    file_delete = File.new('../housekeeping/webcam_pear/files2delete.xml', 'w')
    doc_delete = Document.new()
    doc_delete.add_element('files')
    
    ddoc.root.elements.each('file') do |file_node|
      sfile = file_node.text
      idate = Array.new
      idate[0] = sfile.match(/^\d*/).to_s.to_i
      idate[1] = sfile.match(/\_\d*/).to_s.gsub(separator,'').to_i
      idate[2] = sfile.match(/\_\d*\d$/).to_s.gsub(separator,'').to_i

      h = Hash.new
      0.upto(2) {|i| h[a_format[i]] = idate[i]}

      file_date = Date.new(y=h['y'], m=h['m'], d=h['d'])

      if file_date < cut_off_date
        o_file2delete = Element.new('file')
        o_file2delete.text = file_date.strftime(dformat)
        doc_delete.root.add_element o_file2delete
      end
    end
    file_delete.puts doc_delete
  end


file: dir.xml
<dir>
  <file>11_4_2007</file>
  <file>11_5_2007</file>
  <file>11_6_2007</file>
  <file>11_7_2007</file>
  <file>11_8_2007</file>
  <file>11_9_2007</file>
  <file>12_10_2007</file>
  <file>12_11_2007</file>
  <file>12_1_2007</file>
  <file>12_12_2007</file>
  <file>12_13_2007</file>
  <file>12_14_2007</file>
  <file>12_15_2007</file>
  <file>12_16_2007</file>
  <file>12_17_2007</file>
  <file>12_18_2007</file>
  <file>12_19_2007</file>
  <file>12_20_2007</file>
  <file>12_21_2007</file>
  <file>12_2_2007</file>
  <file>12_22_2007</file>
  <file>12_23_2007</file>
  <file>12_24_2007</file>
  <file>12_25_2007</file>
  <file>12_26_2007</file>
  <file>12_27_2007</file>
  <file>12_28_2007</file>
  <file>12_3_2007</file>
  <file>12_4_2007</file>
  <file>12_5_2007</file>
  <file>12_6_2007</file>
  <file>12_7_2007</file>
  <file>12_8_2007</file>
  <file>12_9_2007</file>
 </dir>

file: files2delete.xml
<files>
  <file>11_4_2007</file>
  <file>11_5_2007</file>
  <file>11_6_2007</file>
  <file>11_7_2007</file>
  <file>11_8_2007</file>
  <file>11_9_2007</file>
  <file>12_10_2007</file>
  <file>12_11_2007</file>
  <file>12_1_2007</file>
  <file>12_12_2007</file>
  <file>12_13_2007</file>
  <file>12_14_2007</file>
  <file>12_15_2007</file>
  <file>12_2_2007</file>
  <file>12_3_2007</file>
  <file>12_4_2007</file>
  <file>12_5_2007</file>
  <file>12_6_2007</file>
  <file>12_7_2007</file>
  <file>12_8_2007</file>
  <file>12_9_2007</file>
 </files>
to ruby date formatting xml directory validation file delete by jrobertson on Dec 30, 2007 2 Comments

Using Ruby to change the owner of a file

This code change the owner, and group owner of a file from 'root' to 'apache'. This method differs from File.chown because it allows the group name to be specified rather than the group id. More information can be found from http://www.noobkit.com/ruby-fileutils-chown

require 'fileutils'
FileUtils.chown('apache','apache', 'slashdot.wml')
to ruby file chown by jrobertson on Oct 27, 2007

Using Ruby to copy a file

Using Ruby this code copies a file called 'notes.xml' to a new file called 'notes2.xml'. Refer to ruby-doc.org - Class: File http://urltea.com/1wbt

require 'ftools'
File.copy('notes.xml', 'notes2.xml')

to ruby copy file by jrobertson on Oct 26, 2007
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