diff options
Diffstat (limited to 'lib/mail_handler/mail_handler.rb')
| -rw-r--r-- | lib/mail_handler/mail_handler.rb | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/lib/mail_handler/mail_handler.rb b/lib/mail_handler/mail_handler.rb new file mode 100644 index 000000000..8b227b9ca --- /dev/null +++ b/lib/mail_handler/mail_handler.rb @@ -0,0 +1,179 @@ +# Handles the parsing of email +require 'tmpdir' + +module MailHandler + + if RUBY_VERSION.to_f >= 1.9 + require 'mail' + require 'backends/mail_extensions' + require 'backends/mail_backend' + include Backends::MailBackend + else + require 'action_mailer' + require 'backends/tmail_extensions' + require 'backends/tmail_backend' + include Backends::TmailBackend + end + + # Returns a set of attachments from the given TNEF contents + # The TNEF contents also contains the message body, but in general this is the + # same as the message body in the message proper. + def tnef_attachments(content) + attachments = [] + Dir.mktmpdir do |dir| + IO.popen("#{`which tnef`.chomp} -K -C #{dir}", "wb") do |f| + f.write(content) + f.close + if $?.signaled? + raise IOError, "tnef exited with signal #{$?.termsig}" + end + if $?.exited? && $?.exitstatus != 0 + raise IOError, "tnef exited with status #{$?.exitstatus}" + end + end + found = 0 + Dir.new(dir).sort.each do |file| # sort for deterministic behaviour + if file != "." && file != ".." + file_content = File.open("#{dir}/#{file}", "rb").read + attachments << { :content => file_content, + :filename => file } + found += 1 + end + end + if found == 0 + raise IOError, "tnef produced no attachments" + end + end + attachments + end + + def normalise_content_type(content_type) + # e.g. http://www.whatdotheyknow.com/request/93/response/250 + if content_type == 'application/excel' or content_type == 'application/msexcel' or content_type == 'application/x-ms-excel' + content_type = 'application/vnd.ms-excel' + end + if content_type == 'application/mspowerpoint' or content_type == 'application/x-ms-powerpoint' + content_type = 'application/vnd.ms-powerpoint' + end + if content_type == 'application/msword' or content_type == 'application/x-ms-word' + content_type = 'application/vnd.ms-word' + end + if content_type == 'application/x-zip-compressed' + content_type = 'application/zip' + end + + # e.g. http://www.whatdotheyknow.com/request/copy_of_current_swessex_scr_opt#incoming-9928 + if content_type == 'application/acrobat' + content_type = 'application/pdf' + end + + return content_type + end + + def get_attachment_text_one_file(content_type, body, charset = 'utf-8') + # note re. charset: TMail always tries to convert email bodies + # to UTF8 by default, so normally it should already be that. + text = '' + # XXX - tell all these command line tools to return utf-8 + if content_type == 'text/plain' + text += body + "\n\n" + else + tempfile = Tempfile.new('foiextract') + tempfile.binmode + tempfile.print body + tempfile.flush + default_params = { :append_to => text, :binary_output => false } + if content_type == 'application/vnd.ms-word' + AlaveteliExternalCommand.run("wvText", tempfile.path, tempfile.path + ".txt") + # Try catdoc if we get into trouble (e.g. for InfoRequestEvent 2701) + if not File.exists?(tempfile.path + ".txt") + AlaveteliExternalCommand.run("catdoc", tempfile.path, default_params) + else + text += File.read(tempfile.path + ".txt") + "\n\n" + File.unlink(tempfile.path + ".txt") + end + elsif content_type == 'application/rtf' + # catdoc on RTF prodcues less comments and extra bumf than --text option to unrtf + AlaveteliExternalCommand.run("catdoc", tempfile.path, default_params) + elsif content_type == 'text/html' + # lynx wordwraps links in its output, which then don't + # get formatted properly by Alaveteli. We use elinks + # instead, which doesn't do that. + AlaveteliExternalCommand.run("elinks", "-eval", "set document.codepage.assume = \"#{charset}\"", + "-eval", "set document.codepage.force_assumed = 1", + "-dump-charset", "utf-8", + "-force-html", "-dump", + tempfile.path, + default_params.merge(:env => {"LANG" => "C"})) + elsif content_type == 'application/vnd.ms-excel' + # Bit crazy using /usr/bin/strings - but xls2csv, xlhtml and + # py_xls2txt only extract text from cells, not from floating + # notes. catdoc may be fooled by weird character sets, but will + # probably do for UK FOI requests. + AlaveteliExternalCommand.run("/usr/bin/strings", tempfile.path, default_params) + elsif content_type == 'application/vnd.ms-powerpoint' + # ppthtml seems to catch more text, but only outputs HTML when + # we want text, so just use catppt for now + AlaveteliExternalCommand.run("catppt", tempfile.path, default_params) + elsif content_type == 'application/pdf' + AlaveteliExternalCommand.run("pdftotext", tempfile.path, "-", default_params) + elsif content_type == 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' + # This is Microsoft's XML office document format. + # Just pull out the main XML file, and strip it of text. + xml = AlaveteliExternalCommand.run("/usr/bin/unzip", "-qq", + "-c", + tempfile.path, + "word/document.xml", + {:binary_output => false}) + if !xml.nil? + doc = REXML::Document.new(xml) + text += doc.each_element( './/text()' ){}.join(" ") + end + elsif content_type == 'application/zip' + # recurse into zip files + begin + zip_file = Zip::ZipFile.open(tempfile.path) + text += get_attachment_text_from_zip_file(zip_file) + zip_file.close() + rescue + $stderr.puts("Error processing zip file: #{$!.inspect}") + end + end + tempfile.close + end + + return text + end + def get_attachment_text_from_zip_file(zip_file) + + text = "" + for entry in zip_file + if entry.file? + filename = entry.to_s + begin + body = entry.get_input_stream.read + rescue + # move to next attachment silently if there were problems + # XXX really should reduce this to specific exceptions? + # e.g. password protected + next + end + calc_mime = AlaveteliFileTypes.filename_to_mimetype(filename) + if calc_mime + content_type = calc_mime + else + content_type = 'application/octet-stream' + end + + text += get_attachment_text_one_file(content_type, body) + + end + end + return text + end + + # Turn instance methods into class methods + extend self + +end + |