# portage.py -- core Portage functionality
# Copyright 1998-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

import portage.exception, socket, smtplib, os, sys, time
from email.MIMEText import MIMEText as TextMessage
from email.MIMEMultipart import MIMEMultipart as MultipartMessage
from email.MIMEBase import MIMEBase as BaseMessage

def create_message(sender, recipient, subject, body, attachments=None):
	if attachments == None:
		mymessage = TextMessage(body)
	else:
		mymessage = MultipartMessage()
		mymessage.attach(TextMessage(body))
		for x in attachments:
			if isinstance(x, BaseMessage):
				mymessage.attach(x)
			elif isinstance(x, str):
				mymessage.attach(TextMessage(x))
			else:
				raise portage.exception.PortageException("Can't handle type of attachment: %s" % type(x))

	mymessage.set_unixfrom(sender)
	mymessage["To"] = recipient
	mymessage["From"] = sender
	mymessage["Subject"] = subject
	mymessage["Date"] = time.strftime("%a, %d %b %Y %H:%M:%S %z")
	
	return mymessage

def send_mail(mysettings, message):
	mymailhost = "localhost"
	mymailport = 25
	mymailuser = ""
	mymailpasswd = ""
	myrecipient = "root@localhost"
	
	# Syntax for PORTAGE_ELOG_MAILURI (if defined):
	# adress [[user:passwd@]mailserver[:port]]
	# where adress:     recipient adress
	#       user:       username for smtp auth (defaults to none)
	#       passwd:     password for smtp auth (defaults to none)
	#       mailserver: smtp server that should be used to deliver the mail (defaults to localhost)
	#					alternatively this can also be the absolute path to a sendmail binary if you don't want to use smtp
	#       port:       port to use on the given smtp server (defaults to 25, values > 100000 indicate that starttls should be used on (port-100000))
	if " " in mysettings["PORTAGE_ELOG_MAILURI"]:
		myrecipient, mymailuri = mysettings["PORTAGE_ELOG_MAILURI"].split()
		if "@" in mymailuri:
			myauthdata, myconndata = mymailuri.rsplit("@", 1)
			try:
				mymailuser,mymailpasswd = myauthdata.split(":")
			except ValueError:
				print "!!! invalid SMTP AUTH configuration, trying unauthenticated ..."
		else:
			myconndata = mymailuri
		if ":" in myconndata:
			mymailhost,mymailport = myconndata.split(":")
		else:
			mymailhost = myconndata
	else:
		myrecipient = mysettings["PORTAGE_ELOG_MAILURI"]
	
	myfrom = message.get("From")
		
	# user wants to use a sendmail binary instead of smtp
	if mymailhost[0] == os.sep and os.path.exists(mymailhost):
		fd = os.popen(mymailhost+" -f "+myfrom+" "+myrecipient, "w")
		fd.write(message.as_string())
		if fd.close() != None:
			sys.stderr.write("!!! %s returned with a non-zero exit code. This generally indicates an error.\n" % mymailhost)
	else:
		try:
			if int(mymailport) > 100000:
				myconn = smtplib.SMTP(mymailhost, int(mymailport) - 100000)
				myconn.ehlo()
				if not myconn.has_extn("STARTTLS"):
					raise portage.exception.PortageException("!!! TLS support requested for logmail but not suported by server")
				myconn.starttls()
				myconn.ehlo()
			else:
				myconn = smtplib.SMTP(mymailhost, mymailport)
			if mymailuser != "" and mymailpasswd != "":
				myconn.login(mymailuser, mymailpasswd)
			myconn.sendmail(myfrom, myrecipient, message.as_string())
			myconn.quit()
		except smtplib.SMTPException, e:
			raise portage.exception.PortageException("!!! An error occured while trying to send logmail:\n"+str(e))
		except socket.error, e:
			raise portage.exception.PortageException("!!! A network error occured while trying to send logmail:\n"+str(e)+"\nSure you configured PORTAGE_ELOG_MAILURI correctly?")
	return