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utils.rb
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Jean-Philippe Lang
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#--
# Copyright (c) 1998-2003 Minero Aoki <aamine@loveruby.net>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Note: Originally licensed under LGPL v2+. Using MIT license for Rails
# with permission of Minero Aoki.
#++
# = TMail - The EMail Swiss Army Knife for Ruby
#
# The TMail library provides you with a very complete way to handle and manipulate EMails
# from within your Ruby programs.
#
# Used as the backbone for email handling by the Ruby on Rails and Nitro web frameworks as
# well as a bunch of other Ruby apps including the Ruby-Talk mailing list to newsgroup email
# gateway, it is a proven and reliable email handler that won't let you down.
#
# Originally created by Minero Aoki, TMail has been recently picked up by Mikel Lindsaar and
# is being actively maintained. Numerous backlogged bug fixes have been applied as well as
# Ruby 1.9 compatibility and a swath of documentation to boot.
#
# TMail allows you to treat an email totally as an object and allow you to get on with your
# own programming without having to worry about crafting the perfect email address validation
# parser, or assembling an email from all it's component parts.
#
# TMail handles the most complex part of the email - the header. It generates and parses
# headers and provides you with instant access to their innards through simple and logically
# named accessor and setter methods.
#
# TMail also provides a wrapper to Net/SMTP as well as Unix Mailbox handling methods to
# directly read emails from your unix mailbox, parse them and use them.
#
# Following is the comprehensive list of methods to access TMail::Mail objects. You can also
# check out TMail::Mail, TMail::Address and TMail::Headers for other lists.
module TMail
# Provides an exception to throw on errors in Syntax within TMail's parsers
class SyntaxError < StandardError; end
# Provides a new email boundary to separate parts of the email. This is a random
# string based off the current time, so should be fairly unique.
#
# For Example:
#
# TMail.new_boundary
# #=> "mimepart_47bf656968207_25a8fbb80114"
# TMail.new_boundary
# #=> "mimepart_47bf66051de4_25a8fbb80240"
def TMail.new_boundary
'mimepart_' + random_tag
end
# Provides a new email message ID. You can use this to generate unique email message
# id's for your email so you can track them.
#
# Optionally takes a fully qualified domain name (default to the current hostname
# returned by Socket.gethostname) that will be appended to the message ID.
#
# For Example:
#
# email.message_id = TMail.new_message_id
# #=> "<47bf66845380e_25a8fbb80332@baci.local.tmail>"
# email.to_s
# #=> "Message-Id: <47bf668b633f1_25a8fbb80475@baci.local.tmail>\n\n"
# email.message_id = TMail.new_message_id("lindsaar.net")
# #=> "<47bf668b633f1_25a8fbb80475@lindsaar.net.tmail>"
# email.to_s
# #=> "Message-Id: <47bf668b633f1_25a8fbb80475@lindsaar.net.tmail>\n\n"
def TMail.new_message_id( fqdn = nil )
fqdn ||= ::Socket.gethostname
"<#{random_tag()}@#{fqdn}.tmail>"
end
#:stopdoc:
def TMail.random_tag #:nodoc:
@uniq += 1
t = Time.now
sprintf('%x%x_%x%x%d%x',
t.to_i, t.tv_usec,
$$, Thread.current.object_id, @uniq, rand(255))
end
private_class_method :random_tag
@uniq = 0
#:startdoc:
# Text Utils provides a namespace to define TOKENs, ATOMs, PHRASEs and CONTROL characters that
# are OK per RFC 2822.
#
# It also provides methods you can call to determine if a string is safe
module TextUtils
aspecial = %Q|()<>[]:;.\\,"|
tspecial = %Q|()<>[];:\\,"/?=|
lwsp = %Q| \t\r\n|
control = %Q|\x00-\x1f\x7f-\xff|
CONTROL_CHAR = /[#{control}]/n
ATOM_UNSAFE = /[#{Regexp.quote aspecial}#{control}#{lwsp}]/n
PHRASE_UNSAFE = /[#{Regexp.quote aspecial}#{control}]/n
TOKEN_UNSAFE = /[#{Regexp.quote tspecial}#{control}#{lwsp}]/n
# Returns true if the string supplied is free from characters not allowed as an ATOM
def atom_safe?( str )
not ATOM_UNSAFE === str
end
# If the string supplied has ATOM unsafe characters in it, will return the string quoted
# in double quotes, otherwise returns the string unmodified
def quote_atom( str )
(ATOM_UNSAFE === str) ? dquote(str) : str
end
# If the string supplied has PHRASE unsafe characters in it, will return the string quoted
# in double quotes, otherwise returns the string unmodified
def quote_phrase( str )
(PHRASE_UNSAFE === str) ? dquote(str) : str
end
# Returns true if the string supplied is free from characters not allowed as a TOKEN
def token_safe?( str )
not TOKEN_UNSAFE === str
end
# If the string supplied has TOKEN unsafe characters in it, will return the string quoted
# in double quotes, otherwise returns the string unmodified
def quote_token( str )
(TOKEN_UNSAFE === str) ? dquote(str) : str
end
# Wraps supplied string in double quotes unless it is already wrapped
# Returns double quoted string
def dquote( str ) #:nodoc:
unless str =~ /^".*?"$/
'"' + str.gsub(/["\\]/n) {|s| '\\' + s } + '"'
else
str
end
end
private :dquote
# Unwraps supplied string from inside double quotes
# Returns unquoted string
def unquote( str )
str =~ /^"(.*?)"$/m ? $1 : str
end
# Provides a method to join a domain name by it's parts and also makes it
# ATOM safe by quoting it as needed
def join_domain( arr )
arr.map {|i|
if /\A\[.*\]\z/ === i
i
else
quote_atom(i)
end
}.join('.')
end
#:stopdoc:
ZONESTR_TABLE = {
'jst' => 9 * 60,
'eet' => 2 * 60,
'bst' => 1 * 60,
'met' => 1 * 60,
'gmt' => 0,
'utc' => 0,
'ut' => 0,
'nst' => -(3 * 60 + 30),
'ast' => -4 * 60,
'edt' => -4 * 60,
'est' => -5 * 60,
'cdt' => -5 * 60,
'cst' => -6 * 60,
'mdt' => -6 * 60,
'mst' => -7 * 60,
'pdt' => -7 * 60,
'pst' => -8 * 60,
'a' => -1 * 60,
'b' => -2 * 60,
'c' => -3 * 60,
'd' => -4 * 60,
'e' => -5 * 60,
'f' => -6 * 60,
'g' => -7 * 60,
'h' => -8 * 60,
'i' => -9 * 60,
# j not use
'k' => -10 * 60,
'l' => -11 * 60,
'm' => -12 * 60,
'n' => 1 * 60,
'o' => 2 * 60,
'p' => 3 * 60,
'q' => 4 * 60,
'r' => 5 * 60,
's' => 6 * 60,
't' => 7 * 60,
'u' => 8 * 60,
'v' => 9 * 60,
'w' => 10 * 60,
'x' => 11 * 60,
'y' => 12 * 60,
'z' => 0 * 60
}
#:startdoc:
# Takes a time zone string from an EMail and converts it to Unix Time (seconds)
def timezone_string_to_unixtime( str )
if m = /([\+\-])(\d\d?)(\d\d)/.match(str)
sec = (m[2].to_i * 60 + m[3].to_i) * 60
m[1] == '-' ? -sec : sec
else
min = ZONESTR_TABLE[str.downcase] or
raise SyntaxError, "wrong timezone format '#{str}'"
min * 60
end
end
#:stopdoc:
WDAY = %w( Sun Mon Tue Wed Thu Fri Sat TMailBUG )
MONTH = %w( TMailBUG Jan Feb Mar Apr May Jun
Jul Aug Sep Oct Nov Dec TMailBUG )
def time2str( tm )
# [ruby-list:7928]
gmt = Time.at(tm.to_i)
gmt.gmtime
offset = tm.to_i - Time.local(*gmt.to_a[0,6].reverse).to_i
# DO NOT USE strftime: setlocale() breaks it
sprintf '%s, %s %s %d %02d:%02d:%02d %+.2d%.2d',
WDAY[tm.wday], tm.mday, MONTH[tm.month],
tm.year, tm.hour, tm.min, tm.sec,
*(offset / 60).divmod(60)
end
MESSAGE_ID = /<[^\@>]+\@[^>]+>/
def message_id?( str )
MESSAGE_ID === str
end
MIME_ENCODED = /=\?[^\s?=]+\?[QB]\?[^\s?=]+\?=/i
def mime_encoded?( str )
MIME_ENCODED === str
end
def decode_params( hash )
new = Hash.new
encoded = nil
hash.each do |key, value|
if m = /\*(?:(\d+)\*)?\z/.match(key)
((encoded ||= {})[m.pre_match] ||= [])[(m[1] || 0).to_i] = value
else
new[key] = to_kcode(value)
end
end
if encoded
encoded.each do |key, strings|
new[key] = decode_RFC2231(strings.join(''))
end
end
new
end
NKF_FLAGS = {
'EUC' => '-e -m',
'SJIS' => '-s -m'
}
def to_kcode( str )
flag = NKF_FLAGS[TMail.KCODE] or return str
NKF.nkf(flag, str)
end
RFC2231_ENCODED = /\A(?:iso-2022-jp|euc-jp|shift_jis|us-ascii)?'[a-z]*'/in
def decode_RFC2231( str )
m = RFC2231_ENCODED.match(str) or return str
begin
to_kcode(m.post_match.gsub(/%[\da-f]{2}/in) {|s| s[1,2].hex.chr })
rescue
m.post_match.gsub(/%[\da-f]{2}/in, "")
end
end
def quote_boundary
# Make sure the Content-Type boundary= parameter is quoted if it contains illegal characters
# (to ensure any special characters in the boundary text are escaped from the parser
# (such as = in MS Outlook's boundary text))
if @body =~ /^(.*)boundary=(.*)$/m
preamble = $1
remainder = $2
if remainder =~ /;/
remainder =~ /^(.*?)(;.*)$/m
boundary_text = $1
post = $2.chomp
else
boundary_text = remainder.chomp
end
if boundary_text =~ /[\/\?\=]/
boundary_text = "\"#{boundary_text}\"" unless boundary_text =~ /^".*?"$/
@body = "#{preamble}boundary=#{boundary_text}#{post}"
end
end
end
# AppleMail generates illegal character contained Content-Type parameter like:
# name==?ISO-2022-JP?B?...=?=
# so quote. (This case is only value fits in one line.)
def quote_unquoted_bencode
@body = @body.gsub(%r"(;\s+[-a-z]+=)(=\?.+?)([;\r\n ]|\z)"m) {
head, should_quoted, tail = $~.captures
# head: "; name="
# should_quoted: "=?ISO-2022-JP?B?...=?="
head << quote_token(should_quoted) << tail
}
end
# AppleMail generates name=filename attributes in the content type that
# contain spaces. Need to handle this so the TMail Parser can.
def quote_unquoted_name
@body = @body.gsub(%r|(name=)([\w\s.]+)(.*)|m) {
head, should_quoted, tail = $~.captures
# head: "; name="
# should_quoted: "=?ISO-2022-JP?B?...=?="
head << quote_token(should_quoted) << tail
}
end
#:startdoc:
end
end