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+"""Mail to news gateway script. Copyright 2000 Cosimo Alfarano
+
+Author: Cosimo Alfarano
+Date: September 16 2000
+
+mail2news.py - Copyright 2000 by Cosimo Alfarano <Alfarano@Students.CS.UniBo.It>
+You can use this software under the terms of the GPL. If we meet some day,
+and you think this stuff is worth it, you can buy me a beer in return.
+
+Thanks to md for this useful formula. Beer is beer.
+
+Gets news email and sends it via SMTP.
+
+class mail2news is  hopefully conform to rfc850.
+
+"""
+
+import sys
+from os import unlink, getpid
+from socket import gethostbyaddr, gethostname
+import string
+from re import findall
+import time
+import nntplib
+import pyginfo
+import tempfile
+
+class mail2news:
+	"""news to mail gateway class"""
+
+	
+	reader = None				# mode reader
+#	newsgroups = None			# Newsgroups: local.test,local.moderated...
+#	approved = None				# Approved: kame@aragorn.lorien.org
+	newsserver = 'localhost'	# no comment :)
+	port = 119
+	user = None
+	password = None
+
+	hostname = gethostbyaddr(gethostname())[0]
+
+	heads_dict, smtpheads, nntpheads = {}, {}, {}
+	email, headers, body = [], [], []
+
+
+	def readfile(self):
+
+		for line in sys.stdin.readlines():
+			self.email.append(line)
+		
+		if(len(self.email) == 1 and self.email[0][0] == '/'):
+			file = self.email[0][:-1]
+			del self.email[0]
+			for line in open(file,'r').readlines():
+				self.email.append(line)
+				
+		return 1
+
+
+	def parseemail(self):
+		"""get news email from file or stdin and separate heads from body
+
+		REMEBER: headers value has '\n' as last char.
+			Use string[:-1] to ignore newline.
+		"""
+
+		try:
+			body = 0		# are we in body or in headers?
+	
+			for line in self.email:
+				if not body and len(line) == 1:
+					body = 1	# starts email body section
+
+				if not body:
+					try:
+						# if it is a multi-line header like Received:
+						if not line[0] in [' ','\t']:
+							try:
+								head, value = string.split(line, ' ', 1)
+							except string.index_error:
+								value = ''
+							self.smtpheads[head] = value
+						else:
+							self.smtpheads[head] = '%s%s' % \
+								(self.smtpheads[head], line)
+					except (string.index_error), message:
+						print 'line: %s' % line
+						print '(probably missing couple "Header: value" in %s)' % line
+						sys.exit(1)
+	
+				elif len(line) > 0 and body:
+					self.body.append(line)
+	
+		except (string.index_error), message:
+			print message
+			sys.exit(1)
+	
+		return self.smtpheads, self.body
+
+	def puthead(self, dict, list, key):
+		"""private, transform dict entries in list entries
+		Appends key of dict to list, deleting it from dict.
+		"""
+
+		if dict.has_key(key):
+			list.append(key + ' ' + dict.get(key))
+			del dict[key]
+		else:
+			return 0
+		return 1
+
+	def sortheads(self):
+		"""make list sorted by heads: From: To: Subject: first, others, X-*, X-Resent-* last"""
+
+		set = ('Newsgroups:','From:','To:','X-To:','Cc:','Subject:','Date:','Approved:','References:','Message-Id:') # put at top
+
+		for k in set:
+			self.puthead(self.heads_dict,self.headers,k)
+
+		for k in self.heads_dict.keys():
+			if k[:2] != 'X-' and k[:9] != 'X-Resent-' and k not in set:
+				self.puthead(self.heads_dict,self.headers,k)	
+
+		for k in self.heads_dict.keys():
+			if k[:2] == 'X-':
+				self.puthead(self.heads_dict,self.headers,k)
+			
+		for k in self.heads_dict.keys():
+			if k[:9] == 'X-Resent-':
+				self.puthead(self.heads_dict,self.headers,k)
+		
+		return self.headers
+	
+	
+	def mergeheads(self):
+		"""make a unique headers dictionary from NNTP and SMTP 
+		single headers dictionaries."""
+	
+		self.heads_dict = {}
+
+		try:
+			for header in self.smtpheads.keys(): # fill it w/ smtp old heads
+				self.heads_dict[header] = self.smtpheads[header]
+	
+			for header in self.nntpheads.keys(): # and replace them w/ nntp new heads
+				self.heads_dict[header] = self.nntpheads[header]
+
+		except KeyError, message:
+			print message
+
+		return self.heads_dict
+
+	def addheads(self):
+		"""add new header like X-Gateway: 
+		"""
+
+		info = pyginfo.pygsinfo()
+
+		try:
+			self.heads_dict['X-Gateway:'] = info.PROGNAME + ' ' + \
+				info.PROGDESC + ' - Mail to News\n'
+
+# it is nntpheads stuff
+#			if(self.newsgroups):
+#				self.heads_dict['Newsgroups:'] = self.newsgroups
+				
+#			if(self.approved):
+#				self.heads_dict['Approved:'] = self.approved
+	
+		except KeyError, message:
+			print message
+
+		return self.heads_dict
+
+	def renameheads(self):
+		"""rename headers such as Resent-*: to X-Resent-*:
+
+		headers renamed are useless or not rfc 977/850 copliant
+		handles References/In-Reply-To headers
+		"""
+		try:
+
+### test 
+#			if(post):
+#				if(self.heads_dict.has_key(post)):
+#					self.heads_dict['X-Original-' + post] = self.heads_dict[post]
+#
+#				self.heads_dict[post] = self.heads_dict[pre]
+#				del(self.heads_dict[pre])
+#				
+#			else:
+#				if(pre[0:2] == 'X-' and self.heads_dict.has_key(pre)):
+#					self.heads_dict['X-Original-' + pre] = self.heads_dict[pre]	
+#				elif(not pre[0:2] == 'X-' and self.heads_dict.has_key('X-' + pre)):
+#					self.heads_dict['X-' + pre] = self.heads_dict[pre]
+#				del(self.heads_dict[pre])
+### end test
+
+			for key in self.heads_dict.keys():
+				if(key[:7] in ['Resent-']):
+					if(self.heads_dict.has_key('X-' + key)):
+						self.heads_dict[ 'X-Original-' + key ] = self.heads_dict['X-' + key]
+					self.heads_dict[ 'X-' + key ] = self.heads_dict[key]
+					del self.heads_dict[key]
+
+			
+			# In rfc822 References: is considered, but many MUA doen't put it.
+			if(not self.heads_dict.has_key('References:') and self.heads_dict.has_key('In-Reply-To:')):
+				print self.heads_dict['In-Reply-To:']
+
+				# some MUA uses msgid without '<' '>'
+#				ref = findall('([^\s<>\']+@[^\s<>;:\']+)', \
+				# but I prefer use RFC standards
+				ref = findall('(<[^<>]+@[^<>]+>)', \
+					self.heads_dict['In-Reply-To:'])
+
+				# if found, keep first element that seems a Msg-ID.
+				if(ref and len(ref)):
+					self.heads_dict['References:']  = '%s\n' % ref[0]
+			
+#			if(self.heads_dict.has_key('To:')):
+#				self.heads_dict['X-To:'] = self.heads_dict['To:']
+#				del self.heads_dict['To:']
+
+		except KeyError, message:
+			print message
+
+		return self.heads_dict
+
+		
+	def removeheads(self, heads = None):
+		"""remove headers like Xref: Path: Lines:
+		"""
+
+		try:
+			# removing some others useless headers .... (From is not From:)
+
+			rmheads = ['Received:','From','NNTP-Posting-Host:','X-Trace']
+			if(heads):
+				rmheads.append(heads)
+		
+			for head in rmheads:
+				if self.heads_dict.has_key(head):
+					del self.heads_dict[head]
+				
+#			if self.heads_dict.has_key('From'): # neither 'From ' nor 'From:'
+#				del self.heads_dict['From']
+
+#			if self.heads_dict.has_key('NNTP-Posting-Host:'): # neither 'From ' nor 'From:'
+#				del self.heads_dict['']
+
+
+#			if self.heads_dict.has_key('Lines:'):
+#				del self.heads_dict['Lines:']
+
+			# it is usually set by INN, if ng is moderated...
+#			if self.heads_dict.has_key('Sender:'):
+#				del self.heads_dict['Sender:']
+
+	
+			if self.heads_dict.has_key('Message-id:'):
+				self.heads_dict['Message-Id:'] = self.heads_dict['Message-id:']
+				del(self.heads_dict['Message-id:'])
+				
+			if self.heads_dict.has_key('Message-ID:'):
+				self.heads_dict['Message-Id:'] = self.heads_dict['Message-ID:']
+				del(self.heads_dict['Message-ID:'])
+		
+			# If message-id is not present, I generate it
+			if not self.heads_dict.has_key('Message-Id:'):
+				msgid = '<pyg.%d@tuchailepuppapera.org>\n' % (getpid())
+				self.heads_dict['Message-Id:'] = msgid
+
+		except KeyError, message:
+			print message
+
+		return self.heads_dict
+
+	def sendemail(self):
+		"""Talk to NNTP server and try to send email."""
+		try:
+			msglist = []
+
+			n = nntplib.NNTP(self.newsserver, self.port, self.user, self.password)
+
+			if(self.reader):
+				n.putline('mode reader')
+				resp = n.getline()
+				print resp
+	
+			resp = n.shortcmd('POST')
+
+			# sett RFC977 2.4.2 
+			if resp[0] <> '3':
+				raise n.error_reply, str(resp)
+
+			for line in self.headers:
+				if not line:
+					break
+				if line[-1] == '\n':
+					line = line[:-1]
+				if line[:1] == '.':
+					line = '.' + line
+				n.putline(line)
+
+			for line in self.body:
+				if not line:
+					break
+				if line[-1] == '\n':
+					line = line[:-1]
+				if line[:1] == '.':
+					line = '.' + line
+				n.putline(line)
+
+			n.putline('.')
+			n.quit()
+			return None
+		except (nntplib.error_reply, nntplib.error_temp, nntplib.error_perm, nntplib.error_proto, nntplib.error_data), message:
+			return  'NNTP: ' + str(message)