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 collapse

@@config =

class-level configuration object

Configuration.instance

Constants included from BasicLogging

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

Instance Attribute Summary collapse

Attributes included from BasicLogging

#log_level, #target

Instance Method Summary collapse

Methods included from BasicLogging

is_muted?, #log, mute, #set_level, #set_target

Constructor Details

#initialize(article_text) ⇒ Headers

read the headers from the article



28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
 
# File 'lib/headers.rb', line 28

def initialize(article_text)
  
  line = nil
  # transform the article to an array.
  debug('before split, article_text is : ' << article_text)
  line_array = article_text.split($LN)
  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.
  @lines = line_array.slice!(0, end_index)
  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
      # value is all after the first colon
      #  BUGGY: val = l.match(/:(.*)/)[1].strip
      #  BUGFIX 3/2024
      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.



132
133
134
135
 
# File 'lib/headers.rb', line 132

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.



145
146
147
 
# File 'lib/headers.rb', line 145

def lines
  @lines
end

#newsgroups ⇒ Object (readonly)

Returns the value of attribute newsgroups.



145
146
147
 
# File 'lib/headers.rb', line 145

def newsgroups
  @newsgroups
end

Instance Method Details

#header(name) ⇒ Object

returns the value of header ‘name’



86
87
88
89
90
91
92
93
94
 
# File 'lib/headers.rb', line 86

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.



138
139
140
141
142
143
 
# File 'lib/headers.rb', line 138

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



126
127
128
 
# File 'lib/headers.rb', line 126

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

#update ⇒ Object

Modify headers, if need be.



97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
 
# File 'lib/headers.rb', line 97

def update()
  xnay = @newsgroups.xnay
  debug('xnay should be set now : ' << xnay.to_s)
  if xnay 
    @headers["X-No-Archive".to_sym] = xnay
  end
  ch = @@config.CUSTOM_HEADERS
  debug('setting custom headers : ' << ch.inspect)
  if @@config.CUSTOM_HEADERS    
    @@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'
        #  >----------<
        @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