Class: Mail::Body

Inherits:
Object show all
Defined in:
lib/mail/body.rb

Overview

Body

The body is where the text of the email is stored. Mail treats the body as a single object. The body itself has no information about boundaries used in the MIME standard, it just looks at it’s content as either a single block of text, or (if it is a multipart message) as an array of blocks of text.

A body has to be told to split itself up into a multipart message by calling #split with the correct boundary. This is because the body object has no way of knowing what the correct boundary is for itself (there could be many boundaries in a body in the case of a nested MIME text).

Once split is called, Mail::Body will slice itself up on this boundary, assigning anything that appears before the first part to the preamble, and anything that appears after the closing boundary to the epilogue, then each part gets initialized into a Mail::Part object.

The boundary that is used to split up the Body is also stored in the Body object for use on encoding itself back out to a string. You can overwrite this if it needs to be changed.

On encoding, the body will return the preamble, then each part joined by the boundary, followed by a closing boundary string and then the epilogue.

Instance Method Summary collapse

Constructor Details

#initialize(string = '') ⇒ Body

Returns a new instance of Body.



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# File 'lib/mail/body.rb', line 29

def initialize(string = '')
  @boundary = nil
  @preamble = nil
  @epilogue = nil
  @charset  = nil
  @part_sort_order = [ "text/plain", "text/enriched", "text/html" ]
  @parts = Mail::PartsList.new
  if string.blank?
    @raw_source = ''
  else
    # Do join first incase we have been given an Array in Ruby 1.9
    if string.respond_to?(:join)
      @raw_source = string.join('')
    elsif string.respond_to?(:to_s)
      @raw_source = string.to_s
    else
      raise "You can only assign a string or an object that responds_to? :join or :to_s to a body."
    end
  end
  @encoding = (only_us_ascii? ? '7bit' : '8bit')
  set_charset
end

Instance Method Details

#<<(val) ⇒ Object 



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# File 'lib/mail/body.rb', line 250

def <<( val )
  if @parts
    @parts << val
  else
    @parts = Mail::PartsList.new[val]
  end
end

#==(other) ⇒ Object

Matches this body with another body. Also matches the decoded value of this body with a string.

Examples:

body = Mail::Body.new('The body')
body == body #=> true

body = Mail::Body.new('The body')
body == 'The body' #=> true

body = Mail::Body.new("VGhlIGJvZHk=\n")
body.encoding = 'base64'
body == "The body" #=> true



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# File 'lib/mail/body.rb', line 66

def ==(other)
  if other.class == String
    self.decoded == other
  else
    super
  end
end

#=~(regexp) ⇒ Object

Accepts a string and performs a regular expression against the decoded text

Examples:

body = Mail::Body.new('The body')
body =~ /The/ #=> 0

body = Mail::Body.new("VGhlIGJvZHk=\n")
body.encoding = 'base64'
body =~ /The/ #=> 0



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# File 'lib/mail/body.rb', line 84

def =~(regexp)
  self.decoded =~ regexp
end

#boundary ⇒ Object

Returns the boundary used by the body



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# File 'lib/mail/body.rb', line 237

def boundary
  @boundary
end

#boundary=(val) ⇒ Object

Allows you to change the boundary of this Body object



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# File 'lib/mail/body.rb', line 242

def boundary=( val )
  @boundary = val
end

#charset ⇒ Object 



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# File 'lib/mail/body.rb', line 187

def charset
  @charset
end

#charset=(val) ⇒ Object 



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# File 'lib/mail/body.rb', line 191

def charset=( val )
  @charset = val
end

#decoded ⇒ Object 



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# File 'lib/mail/body.rb', line 175

def decoded
  if !Encodings.defined?(encoding)
    raise UnknownEncodingType, "Don't know how to decode #{encoding}, please call #encoded and decode it yourself."
  else
    Encodings.get_encoding(encoding).decode(raw_source)
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mail/body.rb', line 273

def empty?
  !!raw_source.to_s.empty?
end

#encoded(transfer_encoding = '8bit') ⇒ Object

Returns a body encoded using transfer_encoding. Multipart always uses an identiy encoding (i.e. no encoding). Calling this directly is not a good idea, but supported for compatibility TODO: Validate that preamble and epilogue are valid for requested encoding



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# File 'lib/mail/body.rb', line 150

def encoded(transfer_encoding = '8bit')
  if multipart?
    self.sort_parts!
    encoded_parts = parts.map { |p| p.encoded }
    ([preamble] + encoded_parts).join(crlf_boundary) + end_boundary + epilogue.to_s
  else
    be = get_best_encoding(transfer_encoding)
    dec = Mail::Encodings::get_encoding(encoding)
    enc = Mail::Encodings::get_encoding(be)
    if transfer_encoding == encoding and dec.nil?
        # Cannot decode, so skip normalization
        raw_source
    else
        # Decode then encode to normalize and allow transforming 
        # from base64 to Q-P and vice versa
        decoded = dec.decode(raw_source)
        if defined?(Encoding) && charset && charset != "US-ASCII"
          decoded.encode!(charset)
          decoded.force_encoding('BINARY') unless Encoding.find(charset).ascii_compatible?
        end
        enc.encode(decoded)
    end
  end
end

#encoding(val = nil) ⇒ Object 



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# File 'lib/mail/body.rb', line 195

def encoding(val = nil)
  if val
    self.encoding = val
  else
    @encoding
  end
end

#encoding=(val) ⇒ Object 



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# File 'lib/mail/body.rb', line 203

def encoding=( val )
  @encoding = if val == "text" || val.blank?
      (only_us_ascii? ? '7bit' : '8bit')
  else
      val
  end
end

#epilogue ⇒ Object

Returns the epilogue (any text that is after the last MIME boundary)



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# File 'lib/mail/body.rb', line 222

def epilogue
  @epilogue
end

#epilogue=(val) ⇒ Object

Sets the epilogue to a string (adds text after the last MIME boundary)



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# File 'lib/mail/body.rb', line 227

def epilogue=( val )
  @epilogue = val
end

#get_best_encoding(target) ⇒ Object 



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# File 'lib/mail/body.rb', line 141

def get_best_encoding(target)
  target_encoding = Mail::Encodings.get_encoding(target)
  target_encoding.get_best_compatible(encoding, raw_source)
end

#include?(other) ⇒ Boolean

Accepts anything that responds to #to_s and checks if it’s a substring of the decoded text

Examples:

body = Mail::Body.new('The body')
body.include?('The') #=> true

body = Mail::Body.new("VGhlIGJvZHk=\n")
body.encoding = 'base64'
body.include?('The') #=> true

Returns:

  • (Boolean) 


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# File 'lib/mail/body.rb', line 112

def include?(other)
  self.decoded.include?(other.to_s)
end

#match(regexp) ⇒ Object

Accepts a string and performs a regular expression against the decoded text

Examples:

body = Mail::Body.new('The body')
body.match(/The/) #=> #<MatchData "The">

body = Mail::Body.new("VGhlIGJvZHk=\n")
body.encoding = 'base64'
body.match(/The/) #=> #<MatchData "The">



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# File 'lib/mail/body.rb', line 98

def match(regexp)
  self.decoded.match(regexp)
end

#multipart? ⇒ Boolean

Returns true if there are parts defined in the body

Returns:

  • (Boolean) 


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# File 'lib/mail/body.rb', line 232

def multipart?
  true unless parts.empty?
end

#only_us_ascii? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mail/body.rb', line 269

def only_us_ascii?
  !(raw_source =~ /[^\x01-\x7f]/)
end

#parts ⇒ Object 



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# File 'lib/mail/body.rb', line 246

def parts
  @parts
end

#preamble ⇒ Object

Returns the preamble (any text that is before the first MIME boundary)



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# File 'lib/mail/body.rb', line 212

def preamble
  @preamble
end

#preamble=(val) ⇒ Object

Sets the preamble to a string (adds text before the first MIME boundary)



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# File 'lib/mail/body.rb', line 217

def preamble=( val )
  @preamble = val
end

#raw_source ⇒ Object

Returns the raw source that the body was initialized with, without any tampering



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# File 'lib/mail/body.rb', line 137

def raw_source
  @raw_source
end

#set_sort_order(order) ⇒ Object

Allows you to set the sort order of the parts, overriding the default sort order. Defaults to ‘text/plain’, then ‘text/enriched’, then ‘text/html’ with any other content type coming after.



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# File 'lib/mail/body.rb', line 119

def set_sort_order(order)
  @part_sort_order = order
end

#sort_parts! ⇒ Object

Allows you to sort the parts according to the default sort order, or the sort order you set with :set_sort_order.

sort_parts! is also called from :encode, so there is no need for you to call this explicitly



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# File 'lib/mail/body.rb', line 127

def sort_parts!
  @parts.each do |p|
    p.body.set_sort_order(@part_sort_order)
    @parts.sort!(@part_sort_order)
    p.body.sort_parts!
  end
end

#split!(boundary) ⇒ Object 



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# File 'lib/mail/body.rb', line 258

def split!(boundary)
  self.boundary = boundary
  parts = raw_source.split(/--#{Regexp.escape(boundary)}(?=(?:--)?\s*$)/)
  # Make the preamble equal to the preamble (if any)
  self.preamble = parts[0].to_s.strip
  # Make the epilogue equal to the epilogue (if any)
  self.epilogue = parts[-1].to_s.sub('--', '').strip
  parts[1...-1].to_a.each { |part| @parts << Mail::Part.new(part) }
  self
end

#to_s ⇒ Object 



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# File 'lib/mail/body.rb', line 183

def to_s
  decoded
end