| 1 | #!/usr/bin/env python
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| 2 | # -*- coding: utf-8 -*-
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| 3 | '''
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| 4 | html_footer.py
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| 5 |
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| 6 | This script looks for special formated plain messages and convert them
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| 7 | into html. It is intended to use this script as a postfix message filter.
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| 8 |
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| 9 | It can be used as a pipe or as a standalone stmp daemon application.
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| 10 |
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| 11 | Usage: html_footer.py [OPTION...]
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| 12 |
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| 13 | -h, --help show this help message
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| 14 | -V, --version shows version information
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| 15 | -u, --uid=USERNAME run as uid if in daemon mode
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| 16 | -p, --pipemode read/write message from/to stdin/stdout
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| 17 | -d, --debuglevel=LEVEL default level = info
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| 18 | valid levels: critical, error, warning,
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| 19 | info, debug
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| 20 | -l, --listen=HOST:IP port to listen on (default: 127.0.0.1:10025)
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| 21 | -r, --remote=HOST:IP relayhost to deliver to (default: 127.0.0.1:25)
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| 22 | -i, --imagepath=PATH path for attachments (default: /var/lib/html_footer)
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| 23 | -f, --logfile=FILENAME
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| 24 | -k, --kill kills daemon
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| 25 | -p, --pidfile=FILENAME pidfile for daemon (default: /var/run/html_footer.pid)
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| 26 |
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| 27 | The decision if a mail has to be converted is taken by a line with the
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| 28 | tags <html> </html> in the signature of the plain mail.
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| 29 |
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| 30 | Example:
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| 31 | -----8<-----
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| 32 | Dear ..
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| 33 |
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| 34 | best regards
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| 35 | --
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| 36 | Text signature
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| 37 | <html>
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| 38 | <hr/>
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| 39 | <p>
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| 40 | Html signature
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| 41 | </p>
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| 42 | </html>
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| 43 | -----8<-----
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| 44 |
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| 45 | If image tags a refered in html attachment text, the should be placed in
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| 46 | the directory IMG_PATH on the machine the script is running on.
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| 47 | The use of inline encoded data is also possible.
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| 48 | The img tag is only recognized if it doesn't span over a linebreak.
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| 49 | The src-attributes content should be prefixed with file: or without
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| 50 | any protocol directive. eg. <img src="logo.png">
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| 51 |
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| 52 | @copyright: 2012 dass IT GmbH
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| 53 | @author: Holger Mueller <hmueller@dass-it.de>
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| 54 | '''
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| 55 | import logging
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| 56 | from pprint import pformat
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| 57 | import sys
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| 58 | import os
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| 59 | import errno
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| 60 | import getopt
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| 61 |
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| 62 | import email
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| 63 | from email.mime.text import MIMEText
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| 64 | from email.mime.image import MIMEImage
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| 65 | from email.mime.multipart import MIMEMultipart
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| 66 | from email.charset import Charset
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| 67 | from email.utils import make_msgid
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| 68 |
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| 69 | from smtpd import PureProxy
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| 70 | import asyncore
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| 71 | from daemon import Daemon
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| 72 |
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| 73 | import re
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| 74 | from urlparse import urlparse
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| 75 |
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| 76 | # Insert modification in email header
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| 77 | X_HEADER = True
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| 78 |
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| 79 | #
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| 80 | # Nothing to configure below!
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| 81 | #
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| 82 | __version__="20120227"
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| 83 |
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| 84 | class HyperTextFormatter(object):
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| 85 | '''Parse plain text and generate hypertext'''
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| 86 |
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| 87 | HTML_HEADER=u'''<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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| 88 | "http://www.w3.org/TR/html4/loose.dtd">
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| 89 | <head>
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| 90 | <meta http-equiv="content-type" content="text/html; charset=UTF-8">
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| 91 | <style type="text/css">
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| 92 | #plaintext {
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| 93 | font-family:Fixedsys,Courier,monospace;
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| 94 | padding:10px;
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| 95 | white-space:pre-wrap;
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| 96 | }
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| 97 | </style>
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| 98 | </head>
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| 99 | <body>
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| 100 | '''
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| 101 | HTML_FOOTER = u'</body>\n</html>'
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| 102 | # Regex for referal of image attachements
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| 103 | RXP_IMG_TAG = re.compile(ur'(<img\s[^>]*src=")([^"]+)("[^>]*>)',
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| 104 | re.UNICODE)
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| 105 |
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| 106 | def __init__(self, header=u''):
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| 107 | """initialize the class,
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| 108 | a custom html header could be supplied
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| 109 | """
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| 110 | if header != u'':
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| 111 | self.txt += header
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| 112 | else:
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| 113 | self.txt = self.HTML_HEADER
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| 114 | self.attachments = []
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| 115 | self.parts = 1
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| 116 |
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| 117 | def add_txt(self, txt=u''):
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| 118 | """add plain text and wrap it to html"""
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| 119 | self.txt += self.txt2html(txt)
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| 120 |
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| 121 | def add_html(self, html=u''):
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| 122 | """add html text without modification"""
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| 123 | self.txt += html
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| 124 |
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| 125 | def add_footer(self):
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| 126 | """extends the current html text with the default footer"""
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| 127 | self.txt += self.HTML_FOOTER
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| 128 |
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| 129 | def create_mime_attachments(self):
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| 130 | """scans current html text, creates a MIME object for every
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| 131 | referenced image and replace src-attribute with a cid:
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| 132 | reference to the generated MIME objects.
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| 133 | Returns the list of generated MIME objects.
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| 134 | """
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| 135 | def replacer(m):
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| 136 | """callback function for re.sub"""
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| 137 | url = urlparse(m.group(2))
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| 138 | filename = os.path.join(options.imagepath, os.path.split(url.path)[1])
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| 139 | fp = open(filename, 'rb')
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| 140 | img = MIMEImage(fp.read())
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| 141 | img_id = make_msgid("part%i" % self.parts)
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| 142 | img.add_header('Content-ID', img_id)
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| 143 | img.add_header('Content-Disposition',
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| 144 | 'attachment',
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| 145 | filename = url.path)
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| 146 | self.attachments.append(img)
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| 147 | self.parts += 1
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| 148 | return "%scid:%s%s" %(m.group(1), img_id.strip('<>'), m.group(3))
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| 149 |
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| 150 | self.txt = self.RXP_IMG_TAG.sub(replacer, self.txt)
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| 151 | return self.attachments
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| 152 |
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| 153 | def get(self, add_footer=True):
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| 154 |
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| 155 | if add_footer:
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| 156 | self.add_footer()
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| 157 | return self.txt
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| 158 |
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| 159 | def has_attachments(self):
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| 160 | """returns True if img tags with file: or no protocol extension
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| 161 | found in current html text
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| 162 | """
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| 163 | m = self.RXP_IMG_TAG.search(self.txt)
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| 164 | if m:
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| 165 | url = urlparse(m.group(2))
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| 166 | if (url.path and (not url.scheme or
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| 167 | url.scheme == "file")):
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| 168 | return True
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| 169 |
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| 170 | return False
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| 171 |
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| 172 | def txt2html(self, txt=u""):
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| 173 | """helper function to preformat plain text"""
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| 174 | html = u'<pre id="plaintext">\n'
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| 175 | html += txt
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| 176 | html += u'</pre>\n'
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| 177 | return html
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| 178 |
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| 179 | class MIMEChanger(object):
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| 180 |
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| 181 | # Regex to split message from signature
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| 182 | RXP_SIGNATURE = re.compile(r'(.*)^--\s+(.*)',
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| 183 | re.MULTILINE | re.DOTALL | re.UNICODE)
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| 184 | RXP_SIG_HTML = re.compile(ur'^<html>\n', re.MULTILINE | re.UNICODE)
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| 185 |
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| 186 | def __init__(self):
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| 187 | pass
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| 188 |
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| 189 | def _copy_mime_root(self,
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| 190 | msg,
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| 191 | strip_content = True):
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| 192 | """Make a copy of the non_payload root mime part of msg and change
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| 193 | content type to multipart/alternativ. By default drop old Content- headers.
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| 194 | """
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| 195 |
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| 196 | msg_new = MIMEMultipart()
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| 197 | # drop default keys
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| 198 | for k in msg_new.keys():
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| 199 | del msg_new[k]
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| 200 |
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| 201 | # make copy of old header
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| 202 | for k, v in msg.items():
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| 203 | if strip_content and k.startswith('Content-'): continue
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| 204 | msg_new[k] = v
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| 205 |
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| 206 | if msg.get_unixfrom():
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| 207 | msg_new.set_unixfrom(msg.get_unixfrom())
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| 208 | if msg.preamble:
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| 209 | msg_new.preamble = msg.preamble
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| 210 | else:
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| 211 | msg_new.preamble = "This is a multi-part message in MIME format...\n"
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| 212 | if msg.epilogue:
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| 213 | msg_new.epilogue = msg.epilogue
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| 214 |
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| 215 | # set msg_new type
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| 216 | msg_new.set_type('multipart/alternative')
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| 217 | return msg_new
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| 218 |
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| 219 | def _first_text(self,msg):
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| 220 | """returns first text/plain part of a message as unicode string"""
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| 221 | if not msg.is_multipart():
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| 222 | if msg.get_content_type() != 'text/plain':
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| 223 | return u''
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| 224 | else:
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| 225 | return self._payload2unicode(msg)
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| 226 | else:
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| 227 | for m in msg.get_payload():
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| 228 | if m.get_content_type() == 'text/plain':
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| 229 | return self._payload2unicode(m)
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| 230 | return u''
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| 231 |
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| 232 | def _payload2unicode(self, mimeobj):
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| 233 | """convert MIME text objects to unicode string"""
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| 234 | chrset = mimeobj.get_content_charset(Charset())
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| 235 | return unicode(mimeobj.get_payload(decode=True).decode(chrset))
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| 236 |
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| 237 | def _process_multi(self, msg):
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| 238 | """multipart messages can be changend in place"""
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| 239 |
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| 240 | # find the text/plain mime part in payload
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| 241 | i = 0
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| 242 | pl = msg.get_payload()
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| 243 | for m in pl:
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| 244 | if m.get_content_type() == 'text/plain': break
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| 245 | i += 1
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| 246 |
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| 247 | # change it to the new payload
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| 248 | pl[i] = self.new_payload(pl[i])
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| 249 |
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| 250 | return msg
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| 251 |
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| 252 | def _process_plain(self, msg):
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| 253 | """make container for plain messages"""
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| 254 |
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| 255 | msg_new = self._copy_mime_root(msg)
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| 256 | new_pl = self.new_payload(msg)
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| 257 | for m in new_pl.get_payload():
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| 258 | msg_new.attach(m)
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| 259 |
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| 260 | return msg_new
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| 261 |
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| 262 | def _split_content(self, txt = u''):
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| 263 | """Cuts content from signature of mail message"""
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| 264 | m = self.RXP_SIGNATURE.search(txt)
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| 265 | if m:
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| 266 | return m.groups()
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| 267 | else:
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| 268 | return [txt, u'']
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| 269 |
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| 270 | def _split_signature(self, txt = u''):
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| 271 | """Cuts txt and html part of signature text"""
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| 272 | return self.RXP_SIG_HTML.split(txt, 1)
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| 273 |
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| 274 | def alter_message(self, msg):
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| 275 | """message modification function"""
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| 276 | if not msg.is_multipart():
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| 277 | log.debug('plain message')
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| 278 | new_msg = self._process_plain(msg)
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| 279 | else:
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| 280 | log.debug('multipart message')
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| 281 | new_msg = self._process_multi(msg)
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| 282 |
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| 283 | if X_HEADER:
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| 284 | log.debug('add X-Modified-By header')
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| 285 | new_msg.add_header('X-Modified-By', 'Html Footer %s' % __version__ )
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| 286 | return new_msg
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| 287 |
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| 288 | def html_creator(self):
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| 289 | """returns a HyperTextFormatter instance, can be overloaded
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| 290 | in derived class for better layout creation"""
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| 291 | return HyperTextFormatter()
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| 292 |
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| 293 | def msg_is_to_alter(self, msg):
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| 294 | """check if message should be altered
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| 295 | in this special case we look for a html/xml tag in the
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| 296 | beginning of a line in the the first text/plain mail parts signature
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| 297 | """
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| 298 | txt = self._first_text(msg)
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| 299 | s = self._split_content(txt)[1]
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| 300 |
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| 301 | if self.RXP_SIG_HTML.search(s):
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| 302 | return True
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| 303 | else:
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| 304 | return False
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| 305 |
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| 306 | def new_payload(self, mime_plain):
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| 307 | """create a new mime structure from text/plain
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| 308 | Examples:
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| 309 | multipart/alternative
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| 310 | text/plain
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| 311 | text/html
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| 312 |
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| 313 | multipart/alternative
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| 314 | text/plain
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| 315 | multipart/related
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| 316 | text/html
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| 317 | image/jpg
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| 318 | image/png
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| 319 | """
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| 320 |
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| 321 | html = self.html_creator()
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| 322 |
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| 323 | chrset = mime_plain.get_content_charset(Charset())
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| 324 | t = unicode(mime_plain.get_payload(decode=True), chrset)
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| 325 |
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| 326 | text, signature = self._split_content(t)
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| 327 | html.add_txt(text)
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| 328 | text += u'-- \n'
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| 329 | # strip html from signature
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| 330 |
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| 331 | text += self._split_signature(signature)[0]
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| 332 |
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| 333 | state_html = True
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| 334 | footer = u''
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| 335 | txtbuffer = u''
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| 336 | try:
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| 337 | footer = self._split_signature(signature)[1]
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| 338 | except IndexError:
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| 339 | pass
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| 340 | for l in footer.split(u'\n'):
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| 341 | if l == u'<html>':
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| 342 | state_html = True
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| 343 | if txtbuffer:
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| 344 | html.add_txt(txtbuffer)
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| 345 | txtbuffer = u''
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| 346 | elif l == u'</html>':
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| 347 | state_html = False
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| 348 | else:
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| 349 | if state_html:
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| 350 | html.add_html(l + u'\n')
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| 351 | else:
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| 352 | txtbuffer += l + u'\n'
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| 353 | text += l + u'\n'
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| 354 | if txtbuffer:
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| 355 | html.add_txt(txtbuffer)
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| 356 |
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| 357 | if html.has_attachments():
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| 358 | attachments = html.create_mime_attachments()
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| 359 | msg_html = MIMEMultipart('related')
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| 360 | msg_html.attach(MIMEText(html.get().encode('utf-8'), 'html', 'utf-8'))
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| 361 | for a in attachments:
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| 362 | msg_html.attach(a)
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| 363 | else:
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| 364 | msg_html = MIMEText(html.get().encode('utf-8'), 'html', 'utf-8')
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| 365 |
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| 366 | msg_plain = MIMEText(text.encode('utf-8'), 'plain', 'utf-8')
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| 367 |
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| 368 | pl = MIMEMultipart('alternative')
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| 369 | pl.attach(msg_plain)
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| 370 | pl.attach(msg_html)
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| 371 |
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| 372 | return pl
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| 373 |
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| 374 | class SMTPHTMLFooterServer(PureProxy):
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| 375 | def process_message(self, peer, mailfrom, rcpttos, data):
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| 376 | # TODO return error status (as SMTP answer string) if something goes wrong!
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| 377 | try:
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| 378 | data = modify_data(data)
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| 379 | refused = self._deliver(mailfrom, rcpttos, data)
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| 380 | except Exception, err:
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| 381 | log.exception('Error on delivery: %s', err)
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| 382 | return '550 content rejected: %s' % err
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| 383 | # TBD: what to do with refused addresses?
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| 384 | # print >> DEBUGSTREAM, 'we got some refusals:', refused
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| 385 | if refused:
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| 386 | log.error('content refused: %s', pformat(refused))
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| 387 | return '550 content rejected:'
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| 388 |
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| 389 | class FooterDaemon(Daemon):
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| 390 | def run(self):
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| 391 | asyncore.loop()
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| 392 |
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| 393 | class Options:
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| 394 | uid = ''
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| 395 | listen = ('127.0.0.1', 10025)
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| 396 | remote = ('127.0.0.1', 25)
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| 397 | debuglevel = logging.INFO
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| 398 | cmd = 'start'
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| 399 | pipemode = False
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| 400 | pidfile = '/var/run/hmtl_footer.pid'
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| 401 | imagepath = '/var/lib/html_footer'
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| 402 | logfile = ''
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| 403 | _txt2loglvl = {
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| 404 | 'critical' : logging.CRITICAL,
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| 405 | 'error': logging.ERROR,
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| 406 | 'warning': logging.WARNING,
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| 407 | 'info': logging.INFO,
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| 408 | 'debug': logging.DEBUG,
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| 409 | }
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| 410 |
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| 411 | def usage(code, msg=''):
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| 412 | print >> sys.stderr, __doc__ % globals()
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| 413 | if msg:
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| 414 | print >> sys.stderr, msg
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| 415 | sys.exit(code)
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| 416 |
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| 417 | def parseargs():
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| 418 | try:
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| 419 | opts, args = getopt.getopt(
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| 420 | sys.argv[1:], 'u:Vhpd:l:r:i:f:kp:',
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| 421 | ['uid=', 'version', 'help', 'pipemode', 'debuglevel=',
|
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| 422 | 'listen=', 'remote=', 'imagepath=', 'logfile=',
|
|---|
| 423 | 'kill', 'pidfile='])
|
|---|
| 424 | except getopt.error, e:
|
|---|
| 425 | usage(1, e)
|
|---|
| 426 |
|
|---|
| 427 | options = Options()
|
|---|
| 428 | for opt, arg in opts:
|
|---|
| 429 | if opt in ('-h', '--help'):
|
|---|
| 430 | usage(0)
|
|---|
| 431 | elif opt in ('-V', '--version'):
|
|---|
| 432 | print >> sys.stderr, __version__
|
|---|
| 433 | sys.exit(0)
|
|---|
| 434 | elif opt in ('-u', '--uid'):
|
|---|
| 435 | options.uid = arg
|
|---|
| 436 | elif opt in ('-p', '--pipemode'):
|
|---|
| 437 | options.pipemode = True
|
|---|
| 438 | elif opt in ('-d', '--debuglevel'):
|
|---|
| 439 | if arg in options._txt2loglvl.keys():
|
|---|
| 440 | options.debuglevel = options._txt2loglvl[arg]
|
|---|
| 441 | else:
|
|---|
| 442 | usage(1, 'Unknown debuglevel %s', arg)
|
|---|
| 443 | elif opt in ('-l', '--listen'):
|
|---|
| 444 | i = arg.find(':')
|
|---|
| 445 | if i < 0:
|
|---|
| 446 | usage(1, 'Bad listen address: %s' % arg)
|
|---|
| 447 | try:
|
|---|
| 448 | options.listen = (arg[:i], int(arg[i+1:]))
|
|---|
| 449 | except ValueError:
|
|---|
| 450 | usage(1, 'Bad local port: %s' % arg)
|
|---|
| 451 | elif opt in ('-r', '--remote'):
|
|---|
| 452 | i = arg.find(':')
|
|---|
| 453 | if i < 0:
|
|---|
| 454 | usage(1, 'Bad remote address: %s' % arg)
|
|---|
| 455 | try:
|
|---|
| 456 | options.remote = (arg[:i], int(arg[i+1:]))
|
|---|
| 457 | except ValueError:
|
|---|
| 458 | usage(1, 'Bad remote port: %s' % arg)
|
|---|
| 459 | elif opt in ('-i', '--imagepath'):
|
|---|
| 460 | options.imagepath = arg
|
|---|
| 461 | elif opt in ('-f', '--logfile'):
|
|---|
| 462 | options.logfile = arg
|
|---|
| 463 | elif opt in ('-k', '--kill'):
|
|---|
| 464 | options.cmd = 'stop'
|
|---|
| 465 | elif opt in ('-p', '--pidfile'):
|
|---|
| 466 | options.pidfile = arg
|
|---|
| 467 | if len(args) > 0:
|
|---|
| 468 | usage(1, 'unknown arguments %s' % ', '.join(args))
|
|---|
| 469 |
|
|---|
| 470 | return options
|
|---|
| 471 |
|
|---|
| 472 | def modify_data(msg_in):
|
|---|
| 473 | msg = email.message_from_string(msg_in)
|
|---|
| 474 | if mymime.msg_is_to_alter(msg):
|
|---|
| 475 | log.info('Msg(%s): altered' % msg.get('Message-ID',''))
|
|---|
| 476 | msg = mymime.alter_message(msg)
|
|---|
| 477 | return msg.as_string(unixfrom=True)
|
|---|
| 478 | log.debug('Msg out:\n%s' % msg.as_string(unixfrom=True))
|
|---|
| 479 | else:
|
|---|
| 480 | log.info('Msg(%s): nothing to alter' % msg.get('Message-ID',''))
|
|---|
| 481 | return msg_in
|
|---|
| 482 |
|
|---|
| 483 | #
|
|---|
| 484 | # Main program
|
|---|
| 485 | #
|
|---|
| 486 | if __name__ == '__main__':
|
|---|
| 487 | options = parseargs()
|
|---|
| 488 | logging.basicConfig(level = options.debuglevel,
|
|---|
| 489 | filename = options.logfile)
|
|---|
| 490 | log = logging.getLogger('html_footer')
|
|---|
| 491 |
|
|---|
| 492 | # use as simple pipe filter
|
|---|
| 493 | if options.pipemode:
|
|---|
| 494 | msg_in = sys.stdin.read()
|
|---|
| 495 | log.debug('Msg in:\n%s' % msg_in)
|
|---|
| 496 | try:
|
|---|
| 497 | mymime = MIMEChanger()
|
|---|
| 498 | msg = modify_data(msg_in)
|
|---|
| 499 | log.debug('Msg out:\n%s' % msg)
|
|---|
| 500 | sys.stdout.write(msg)
|
|---|
| 501 | except Exception, err:
|
|---|
| 502 | log.exception(err)
|
|---|
| 503 | sys.stdout.write(msg_in)
|
|---|
| 504 | # run as smtpd
|
|---|
| 505 | else:
|
|---|
| 506 | mymime = MIMEChanger()
|
|---|
| 507 | daemon = FooterDaemon(options.pidfile)
|
|---|
| 508 | if options.cmd == 'stop':
|
|---|
| 509 | log.info('stopping daemon')
|
|---|
| 510 | daemon.stop()
|
|---|
| 511 | sys.exit(0)
|
|---|
| 512 |
|
|---|
| 513 | log.info('starting daemon')
|
|---|
| 514 | if options.uid:
|
|---|
| 515 | try:
|
|---|
| 516 | import pwd
|
|---|
| 517 | except ImportError:
|
|---|
| 518 | log.exception('''Cannot import module "pwd";
|
|---|
| 519 | try running as pipe filter (-p).''')
|
|---|
| 520 | sys.exit(1)
|
|---|
| 521 | runas = pwd.getpwnam(options.uid)[2]
|
|---|
| 522 | try:
|
|---|
| 523 | os.setuid(runas)
|
|---|
| 524 | except OSError, e:
|
|---|
| 525 | if e.errno != errno.EPERM: raise
|
|---|
| 526 | log.exception('''Cannot setuid "%s";
|
|---|
| 527 | try running as pipe filer (-p).''' % options.uid)
|
|---|
| 528 | sys.exit(1)
|
|---|
| 529 | log.debug('Creating server instance')
|
|---|
| 530 | server = SMTPHTMLFooterServer(options.listen, options.remote)
|
|---|
| 531 | # if uid is given daemonize
|
|---|
| 532 | if options.uid:
|
|---|
| 533 | daemon.start()
|
|---|
| 534 | else:
|
|---|
| 535 | asyncore.loop()
|
|---|
