mirror of
https://github.com/jwinterm/modoboa.git
synced 2026-10-17 05:41:25 +02:00
285 lines
9.1 KiB
Python
285 lines
9.1 KiB
Python
# coding: utf-8
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import re
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import lxml
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from django.template import Template, Context
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from django.template.loader import render_to_string
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from django.conf import settings
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import u2u_decode
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import smtplib
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from email.header import decode_header
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from email.mime.text import MIMEText
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from email.utils import make_msgid, formatdate, parseaddr
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import time
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class EmailAddress(object):
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def __init__(self, address):
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self.fulladdress = u2u_decode.u2u_decode(address).strip("\r\t\n")
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(self.name, self.address) = parseaddr(self.fulladdress)
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if self.name == "":
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self.fulladdress = self.address
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def __str__(self):
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return self.fulladdress
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class Email(object):
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def __init__(self, msg, mformat="plain", dformat="plain", links="0"):
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self.attached_map = {}
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self.contents = {"html" : "", "plain" : ""}
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self.headers = []
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self.attachments = {}
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self.mformat = mformat
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self.dformat = dformat
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self.links = links
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self.__parse(msg)
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if not self.contents.has_key(mformat) or self.contents[mformat] == "":
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# Fallback
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self.mformat = mformat == "html" and "plain" or "html"
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self.body = \
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getattr(self, "viewmail_%s" % self.mformat) \
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(self.contents[self.mformat], links=links)
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def __parse_default(self, msg, level):
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"""Default parser
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All parts handled by this parser will be consireded as
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attachments.
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"""
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fname = msg.get_filename()
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if fname is not None:
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decoded = decode_header(fname)
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value = decoded[0][1] is None and decoded[0][0] \
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or unicode(decoded[0][0], decoded[0][1])
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else:
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value = "part_%s" % level
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self.attachments[level] = value
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def _parse_text(self, msg, level):
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"""Displayable content parser
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text, html, calendar, etc. All those contents can be displayed
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inside a navigator.
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"""
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if msg.get_content_subtype() not in ["plain", "html"]:
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self.__parse_default(msg, level)
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target = "plain"
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else:
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target = msg.get_content_subtype()
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self.contents[target] += decode(msg.get_payload(decode=True),
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charset=msg.get_content_charset())
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def _parse_image(self, msg, level):
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"""image/* parser
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The only reason to make a specific parser for images is that,
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sometimes, messages embark inline images, which means they
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must be displayed and not attached.
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"""
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if self.dformat == "html" and self.links != "0" \
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and msg.has_key("Content-Disposition"):
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if msg["Content-Disposition"].startswith("inline"):
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cid = None
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if msg.has_key("Content-ID"):
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m = re.match("<(.+)>", msg["Content-ID"])
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cid = m is not None and m.group(1) or msg["Content-ID"]
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fname = msg.get_filename()
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if fname is None:
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if msg.has_key("Content-Location"):
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fname = msg["Content-Location"]
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elif cid is not None:
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fname = cid
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else:
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# I give up for now :p
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return
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self.attached_map[cid] = re.match("^http:", fname) and fname \
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or self.__save_image(fname, msg)
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return
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self.__parse_default(msg, level)
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def __parse(self, msg, level=None):
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"""Recursive email parser
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A message structure can be complex. To correctly handle
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unknown MIME types, a simple rule is applied : if I don't know
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how to display a specific part, it becomes an attachment! If
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no name is specified for an attachment, the part number
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described in the RFC 3501 (which retrieves BODY sections) is
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used to build a file name (like part_1.1).
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:param msg: message (or part) to parse
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:param level: current part number
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"""
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if msg.is_multipart() and msg.get_content_maintype() != "message":
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cpt = 1
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for part in msg.get_payload():
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nlevel = level is None and ("%d" % cpt) \
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or "%s.%d" % (level, cpt)
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self.__parse(part, nlevel)
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cpt += 1
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return
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if level is None:
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level = "1"
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try:
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getattr(self, "_parse_%s" % msg.get_content_maintype())(msg, level)
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except AttributeError:
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self.__parse_default(msg, level)
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def __save_image(self, fname, part):
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"""Save an inline image on the filesystem.
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Some HTML messages are using inline images (attached images
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with links on them inside the body). In order to display them,
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images are saved on the filesystem and links contained in the
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message are modified.
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:param fname: the image associated filename
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:param part: the email part that contains the image payload
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"""
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if re.search("\.\.", fname):
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return None
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path = "/static/tmp/" + fname
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fp = open(settings.MODOBOA_DIR + path, "wb")
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fp.write(part.get_payload(decode=True))
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fp.close()
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return path
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def map_cid(self, url):
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import re
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m = re.match(".*cid:(.+)", url)
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if m:
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if self.attached_map.has_key(m.group(1)):
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return self.attached_map[m.group(1)]
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return url
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def render_headers(self, **kwargs):
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return render_to_string("common/mailheaders.html", {
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"headers" : self.headers,
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})
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def viewmail_plain(self, content, **kwargs):
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return "<pre>%s</pre>" % content
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def viewmail_html(self, content, **kwargs):
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if content is None or content == "":
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return ""
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links = kwargs.has_key("links") and kwargs["links"] or "0"
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html = lxml.html.fromstring(content)
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if links == "0":
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html.rewrite_links(lambda x: None)
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else:
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html.rewrite_links(self.map_cid)
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body = html.find("body")
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if body is None:
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body = lxml.html.tostring(html)
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else:
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body = lxml.html.tostring(body)
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body = re.sub("<(/?)body", lambda m: "<%sdiv" % m.group(1), body)
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body = Template(body).render(Context({}))
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return body
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def split_mailbox(mailbox):
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"""Tries to split a mailbox in two parts (local part and domain name)
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:return: a 2-uple (local part, domain)
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"""
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try:
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mailbox.index("@")
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except ValueError:
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return mailbox, None
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parts = mailbox.split('@')
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if len(parts) == 2:
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address = parts[0]
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domain = parts[1]
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else:
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domain = parts[-1]
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address = "@".join(parts[:-1])
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return (address, domain)
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def decode(s, encodings=('utf8', 'latin1', 'windows-1252', 'ascii'), charset=None):
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if charset is not None:
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try:
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return s.decode(charset, 'ignore')
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except LookupError:
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pass
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for encoding in encodings:
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try:
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return s.decode(encoding)
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except UnicodeDecodeError:
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pass
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return s.decode('ascii', 'ignore')
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def __sendmail(sender, rcpt, msgstring, server='localhost', port=25):
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"""Message sending
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Return a tuple (True, None) on success, (False, error message)
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otherwise.
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:param sender: sender address
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:param rcpt: recipient address
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:param msgstring: the message structure (must be a string)
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:param server: the sending server's address
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:param port: the listening port
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:return: tuple
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"""
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try:
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s = smtplib.SMTP(server, port)
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s.sendmail(sender, [rcpt], msgstring)
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s.quit()
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except smtplib.SMTPException, e:
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return False, "SMTP error: %s" % str(e)
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return True, None
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def sendmail_simple(sender, rcpt, content=""):
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"""Simple way to send a text message
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Send a text/plain message with basic headers (msg-id, date).
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Return a tuple (True, None) on success, (False, error message)
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otherwise.
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:param sender: sender address
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:param rcpt: recipient address
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:param content: message's content
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:return: tuple
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"""
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msg = MIMEText(content)
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msg["Subject"] = "Sample message"
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msg["From"] = sender
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msg["To"] = rcpt
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msg["Message-ID"] = make_msgid()
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msg["Date"] = formatdate(time.time(), True)
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return __sendmail(sender, rcpt, msg.as_string())
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def sendmail_fromfile(sender, rcpt, fname):
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"""Send a message contained within a file
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The given file name must represent a valid message structure. It
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must not include the From: and To: headers, they are automatically
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added by the function.
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:param sender: sender address
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:param rcpt: recipient address
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:param fname: the name of the file containing the message
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:return: a tuple
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"""
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try:
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fp = open(fname)
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except IOError, e:
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return False, str(e)
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content = """From: %s
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To: %s
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""" % (sender, rcpt)
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content += fp.read()
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fp.close()
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return __sendmail(sender, rcpt, content)
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