Class: Headers

Inherits:
Object
  • Object
show all
Includes:
BasicLogging
Defined in:
lib/headers.rb

Overview

an object of this class represents the headers of a news-article

Constant Summary

Constants included from BasicLogging

BasicLogging::DEBUG, BasicLogging::ERROR, BasicLogging::FATAL, BasicLogging::INFO, BasicLogging::Levels, BasicLogging::UNKNOWN, BasicLogging::WARN

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from BasicLogging

#clear_log, is_muted?, #level, #log, mute, #set_level, #set_target, #target

Constructor Details

#initialize(article_text) ⇒ Headers

read the headers from the article



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# File 'lib/headers.rb', line 26

def initialize(article_text)
  
  @config = Configuration.instance
  line = nil
  # transform the article to an array.
  debug('before split, article_text is : ' << article_text)
  line_array = article_text.split($LN)

  # Emsure that all three headers are present.
  missing_header = ['From:', 'Newsgroups:', 'Message-ID:'].detect{|h| ! line_array.any?{|l| l.match(h) } } 
  if(missing_header)
    msg = "Input does not look like a news-article, no #{missing_header.delete(':')}; aborting."
    STDERR.puts msg
    error(msg)
    exit false
  end

  debug('after split, line_array is : ' << line_array.inspect)
  # find the first empty line
  end_index = line_array.index {|ele| ele.strip == ''}
  # keep the preceding lines.
  begin
    @lines = line_array.slice!(0, end_index)
  rescue Exception => ex
    msg = 'ERROR: cannot split the input into lines: ' << self.class.name << ': ' << ex.message
    # console
    STDERR.puts msg
    # log
    error(msg)
    exit false
  end

  debug('headers: ' << @lines.to_s)

  # headername: headervalue
  @headers = {}

  # fill the headers Hash from the header-lines.
  # headers may have been line-wrapped. 

  cur_header = nil
  @lines.each do |l| 
    # has the header been wrapped?
    if !l.start_with?(/\s+/)
      # header is all before the first colon
      begin  
        cur_header = l.match(/^(.*?):/)[1].to_sym
      rescue Exception => ex
        error ("Cannot match a header in line " << l << "(" << ex.message << ")")
        exit false;
      end
      # Consider the two following fixes as preliminary until proven. 
      # Getting older, this kind of problem occupies me a lot more than
      # it should.
      #
      # value is all after the first colon
      #  BUGGY: val = l.match(/:(.*)/)[1].strip
      #  BUGFIX 3/2024, use lstrip
      val = l.match(/:(.*)/)[1].lstrip
    else # start_with?('  ')
      # a wrapped value is not devided
      # BUGGY: val = l.strip
      # BUGFIX 3/2024
      val = l
    end
    # add value to the existing 
    if cur_header && @headers[cur_header]  
      @headers[cur_header] += val
    else
      # or add a new value
      @headers[cur_header] = val
    end
    #@headers[l.match(/^(.*?):/)[1].to_sym] = l.match(/:(.*)/)[1].strip
    # h = l.split(':')
    # @headers[h[0].strip.to_sym] = h[1...h.size].join(':').strip
  end
  debug('headers are ' << @headers.to_s)
  @newsgroups = Newsgroups.new(header(:Newsgroups))
  debug('Newsgroups is ' << @newsgroups.inspect)

end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method, args = nil) ⇒ Object

basically a replacement for header(name), above. But you can call self.Newsgroups or self.From etc.



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# File 'lib/headers.rb', line 156

def method_missing(method, args = nil)
  return @headers[method] if @headers[method]
  error("unknown symbol '#{method}'")
end

Instance Attribute Details

#lines ⇒ Object (readonly)

Returns the value of attribute lines.



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# File 'lib/headers.rb', line 169

def lines
  @lines
end

#newsgroups ⇒ Object (readonly)

Returns the value of attribute newsgroups.



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# File 'lib/headers.rb', line 169

def newsgroups
  @newsgroups
end

Instance Method Details

#header(name) ⇒ Object

returns the value of header ‘name’



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# File 'lib/headers.rb', line 109

def header(name)
  # name must be a symbol.
  if name.respond_to?(:to_sym)
    @headers[name]     
  else 
    error(name.to_s << ' is not a symbol!')
    nil
  end
end

#join ⇒ Object

return the headers as a String.



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# File 'lib/headers.rb', line 162

def join
  htext = ''
  @headers.each_pair {|h, t| htext << h.to_s << ': ' << t << $LN }
  debug('joined headers: ' << htext)
  htext
end

#remove(name) ⇒ Object

remove a header



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# File 'lib/headers.rb', line 150

def remove(name)
  @headers.delete(name) if @headers[name]
end

#update ⇒ Object

Modify headers, if need be.



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# File 'lib/headers.rb', line 120

def update()
  no_archive = @newsgroups.no_archive
  debug('no_archive should be set now : ' << no_archive.to_s)
  if no_archive 
    @headers["X-No-Archive".to_sym] = no_archive
    @headers["Archive".to_sym] = 'no'
  end
  if @config.CUSTOM_HEADERS    
    ch = @config.CUSTOM_HEADERS
    debug('setting custom headers : ' << ch.inspect)
    @config.CUSTOM_HEADERS.each do |pair| 
      ch = pair.split(':')
      hn = ch[0].strip
      hv = ch[1].strip
      # Ensure header is ascii only
      if hv.ascii_only? && hn.ascii_only?
        # <---------- special treatment Post-Processor ---------->
        hv << ' ' << PROGVERSION.to_s if hn == 'X-Post-Processor' && hv == 'flnews_post_proc'
        #  >----------<
        @headers[hn.to_sym] = hv
      else
        warn "Custom header [#{hn}:#{hv}] should be ASCII only! Header is ignored!"
      end
    end
    @headers.compact!
  end
  debug('updated headers are ' << @headers.inspect)
end