mailprinter

#!/usr/bin/python

#
# $Id: mailprinter,v 0.1 2016/08/27 09:46:02 ilmaisin Exp $
#

#
# This is a mailto backend for CUPS (www.cups.org)
#
# (C) 2016 Iiro Laiho <ilmaisin@openmailbox.org>
# (C) 2011 Robert Sander <robert.sander@epigenomics.com>
#
# Released under GPL
#
# NO WARRANTY AT ALL
#

import sys, os, tempfile, mimetypes, syslog
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.header import Header

log = "\nLog:\n"

file = "/usr/bin/file"
sendmail = "/usr/sbin/sendmail"

def writelog(message):
    global log

    syslog.syslog(syslog.LOG_INFO, message)
    sys.stderr.write(message)

    if log:
        log += message

def guess_type(datafile):
    type, enc = mimetypes.guess_type(datafile)
    if (not type) or (type == 'application/octet-stream'):
        enc = None
        try:
            type = os.popen("%s -b --mime-type %s 2> /dev/null" % (file, datafile)).read().rstrip()
            if type == "" or type == "data":
                type = "application/octet-stream"
        except:
            type = "application/octet-stream"
    return (type, enc)

def guess_extension(mimetype):
    return(mimetypes.guess_extension(mimetype))

argc = len(sys.argv)

syslog.openlog('mailprinter', syslog.LOG_PID, syslog.LOG_LPR)

if argc == 1:
    print "network mailprinter:/ \"ilmaisin cupsmailprinter PDF converter\" \"Send as email\""
    syslog.syslog(syslog.LOG_INFO, "network mailprinter:/ \"cupsmailprinter PDF converter\" \"Send as email\"")
    syslog.closelog()
    sys.exit(0)

writelog("INFO: mailprinter argv[%s] = '%s'\n" % (argc, "', '".join(sys.argv[1:])))

if argc < 6 or argc > 7:
    writelog("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0])
    sys.exit(1)

jobid = sys.argv[1]
user = sys.argv[2]
title = sys.argv[3]
if title[:7] == "smbprn.":
    title = title[16:]
opts = sys.argv[5].split(" ")

if argc == 7:
    writelog("INFO: file is %s\n" % sys.argv[6])
    infilename = sys.argv[6]
else:
    infilename = tempfile.mktemp(".mailprinter")
    try:
        infile = open(infilename, "w")
    except:
        writelog("ERROR: unable to create tmp file %s\n" % infilename)
        sys.exit(1)
    writelog("INFO: file is stdin\n")
    try:
        infile.write(sys.stdin.read())
    except:
        writelog("ERROR: unable to copy into tmpfile\n")
        sys.exit(1)
    infile.close()
    writelog("INFO: copied stdin to %s\n" % infilename)

infile = open(infilename, "rb")

mailto = None
mailfrom = None
for opt in opts:
    if opt[:7] == "mailto=":
        mailto = opt[7:]
        writelog("INFO: mailto %s\n" % mailto)
    if opt[:9] == "mailfrom=":
        mailfrom = opt[9:]
        writelog("INFO: mailfrom %s\n" % mailfrom)
if not mailfrom:
    if user:
    	mailfrom = user
    else:
    	mailfrom = "lp"
if not mailto:
    if user:
        mailto = user
    else:
        mailto = mailfrom

msg = MIMEMultipart()

# Essential lines to put into the header of a MIME mail.
msg["From"] = mailfrom
msg["To"] = mailto
msg["Subject"] = Header("%s printed as PDF" % title, "utf-8")
if mailto != user and mailfrom != user:
    msg["X-CUPS-mailto-started-by"] = user

msg.preamble = "This is an automatically generated email.\n"

type, enc = guess_type(infilename)
ext = guess_extension(type)
if not ext:
    ext = ""
maintype, subtype = type.split('/', 1)

writelog("INFO: type='%s' enc='%s' ext='%s'\n" % (type, enc, ext))

txt = MIMEText("You printed %s with jobid %s\n%s" % (title, jobid, log))

msg.attach(txt)

if maintype == 'application':
    from email.mime.application import MIMEApplication
    att = MIMEApplication(infile.read(), _subtype=subtype)
elif maintype == 'text':
    att = MIMEText(infile.read(), _subtype=subtype)
elif maintype == 'image':
    from email.mime.image import MIMEImage
    att = MIMEImage(infile.read(), _subtype=subtype)
elif maintype == 'audio':
    from email.mime.audio import MIMEAudio
    att = MIMEAudio(infile.read(), _subtype=subtype)
else:
    from email import encoders
    from email.mime.base import MIMEBase
    att = MIMEBase(maintype, subtype)
    att.set_payload(infile.read())
    encoders.encode_base64(att)

att.add_header('Content-Disposition', 'attachment', filename="%s%s" % (title, ext))

infile.close()

msg.attach(att)

os.popen("%s -t -f%s" % (sendmail, mailfrom), "w").write(msg.as_string())

writelog("INFO: sent email to %s\n" % mailto)

if argc == 6:
    os.unlink(infilename)

writelog("INFO: Ready to print.\n")

syslog.closelog()
sys.exit(0)