lost hopelijk ook weer een annoyance op

multimime-pgp/multimime-pgp.rb

@@ -0,0 +1,82 @@
+#!/usr/bin/env ruby
+
+# $Id$
+# $URL$
+
+#
+# Copyright (c) 2007 Ward Wouts <ward@wouts.nl>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+#
+
+message = Array.new
+boundary = nil
+boundaries = Array.new
+pgpstart = nil
+pgpend = nil
+pgpblocks = Array.new
+
+$stdin.each{|line|
+	message.push line
+}
+
+# Eerst uitzoeken wat de mime boundaries zijn
+message.each{|line|
+	if line.match("Content-Type: multipart/mixed") &&  line.match(/boundary=\"(.*)\"/)
+		if !boundary.nil?
+			raise "More than one MIME boundary detected"
+		else
+			boundary=$1
+		end
+	end
+}
+
+message.each_index{|x|
+	if message[x].match(/^--#{Regexp.escape(boundary)}/)
+		boundaries.push x
+	end
+	if message[x].match(/^-----BEGIN PGP MESSAGE-----$/)
+		if !pgpstart.nil?
+			raise "Multiple PGP starts found in a row"
+		end
+		pgpstart = x
+	end
+	if message[x].match(/^-----END PGP MESSAGE-----$/)
+		if pgpstart.nil?
+			raise "PGP end, but no start found"
+		end
+		pgpblocks.push pgpstart
+		pgpstart = nil
+	end
+}
+
+# magic om uit te rekenen in welke blokken het Content-Type gefixed moet worden
+# er vanuit gaande dat dat steeds tussen een mime-boundry en een pgp start moet
+pgpblocks.reverse_each{|p|
+	boundaries.reverse_each{|b|
+		if b > p
+			next
+		else
+			(b...p).each{|x|
+				if message[x].match(/^Content-Type: .*/)
+					message[x] = "Content-Type: application/pgp; format=text; x-action=encrypt"
+				end
+			}
+			break
+		end
+	}
+}
+
+message.each{|line|
+	puts line
+}