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# The code in this module is entirely lifted from the Lamson project
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# (http://lamsonproject.org/). Its copyright is:
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# Copyright (c) 2008, Zed A. Shaw
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# All rights reserved.
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# It is provided under this license:
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# * Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * Neither the name of the Zed A. Shaw nor the names of its contributors may
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# be used to endorse or promote products derived from this software without
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# specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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# INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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import os
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import mimetypes
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import string
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from email import encoders
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from email.charset import Charset
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from email.utils import parseaddr
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from email.mime.base import MIMEBase
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ADDRESS_HEADERS_WHITELIST = ['From', 'To', 'Delivered-To', 'Cc', 'Bcc']
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DEFAULT_ENCODING = "utf-8"
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VALUE_IS_EMAIL_ADDRESS = lambda v: '@' in v
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def normalize_header(header):
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return string.capwords(header.lower(), '-')
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class EncodingError(Exception):
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"""Thrown when there is an encoding error."""
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pass
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class MailBase(object):
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"""MailBase is used as the basis of lamson.mail and contains the basics of
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encoding an email. You actually can do all your email processing with this
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class, but it's more raw.
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"""
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def __init__(self, items=()):
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self.headers = dict(items)
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self.parts = []
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self.body = None
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self.content_encoding = {'Content-Type': (None, {}),
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'Content-Disposition': (None, {}),
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'Content-Transfer-Encoding': (None, {})}
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def __getitem__(self, key):
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return self.headers.get(normalize_header(key), None)
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def __len__(self):
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return len(self.headers)
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def __iter__(self):
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return iter(self.headers)
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def __contains__(self, key):
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return normalize_header(key) in self.headers
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def __setitem__(self, key, value):
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self.headers[normalize_header(key)] = value
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def __delitem__(self, key):
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del self.headers[normalize_header(key)]
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def __nonzero__(self):
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return self.body != None or len(self.headers) > 0 or len(self.parts) > 0
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def keys(self):
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"""Returns the sorted keys."""
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return sorted(self.headers.keys())
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def attach_file(self, filename, data, ctype, disposition):
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"""
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A file attachment is a raw attachment with a disposition that
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indicates the file name.
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"""
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assert filename, "You can't attach a file without a filename."
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ctype = ctype.lower()
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part = MailBase()
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part.body = data
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part.content_encoding['Content-Type'] = (ctype, {'name': filename})
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part.content_encoding['Content-Disposition'] = (disposition,
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{'filename': filename})
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self.parts.append(part)
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def attach_text(self, data, ctype):
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"""
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This attaches a simpler text encoded part, which doesn't have a
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filename.
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"""
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ctype = ctype.lower()
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part = MailBase()
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part.body = data
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part.content_encoding['Content-Type'] = (ctype, {})
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self.parts.append(part)
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def walk(self):
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for p in self.parts:
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yield p
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for x in p.walk():
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yield x
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class MailResponse(object):
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"""
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You are given MailResponse objects from the lamson.view methods, and
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whenever you want to generate an email to send to someone. It has the
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same basic functionality as MailRequest, but it is designed to be written
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to, rather than read from (although you can do both).
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You can easily set a Body or Html during creation or after by passing it
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as __init__ parameters, or by setting those attributes.
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You can initially set the From, To, and Subject, but they are headers so
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use the dict notation to change them: msg['From'] = 'joe@test.com'.
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The message is not fully crafted until right when you convert it with
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MailResponse.to_message. This lets you change it and work with it, then
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send it out when it's ready.
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"""
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def __init__(self, To=None, From=None, Subject=None, Body=None, Html=None):
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self.Body = Body
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self.Html = Html
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self.base = MailBase([('To', To), ('From', From), ('Subject', Subject)])
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self.multipart = self.Body and self.Html
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self.attachments = []
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def __contains__(self, key):
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return self.base.__contains__(key)
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def __getitem__(self, key):
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return self.base.__getitem__(key)
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def __setitem__(self, key, val):
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return self.base.__setitem__(key, val)
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def __delitem__(self, name):
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del self.base[name]
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def attach(self, filename=None, content_type=None, data=None,
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disposition=None):
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"""
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Simplifies attaching files from disk or data as files. To attach
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simple text simple give data and a content_type. To attach a file,
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give the data/content_type/filename/disposition combination.
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For convenience, if you don't give data and only a filename, then it
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will read that file's contents when you call to_message() later. If
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you give data and filename then it will assume you've filled data
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with what the file's contents are and filename is just the name to
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use.
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"""
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assert filename or data, ("You must give a filename or some data to "
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"attach.")
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assert data or os.path.exists(filename), ("File doesn't exist, and no "
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"data given.")
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self.multipart = True
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if filename and not content_type:
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content_type, encoding = mimetypes.guess_type(filename)
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assert content_type, ("No content type given, and couldn't guess "
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"from the filename: %r" % filename)
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self.attachments.append({'filename': filename,
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'content_type': content_type,
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'data': data,
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'disposition': disposition,})
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def attach_part(self, part):
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"""
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Attaches a raw MailBase part from a MailRequest (or anywhere)
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so that you can copy it over.
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"""
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self.multipart = True
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self.attachments.append({'filename': None,
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'content_type': None,
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'data': None,
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'disposition': None,
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'part': part,
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})
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def attach_all_parts(self, mail_request):
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"""
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Used for copying the attachment parts of a mail.MailRequest
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object for mailing lists that need to maintain attachments.
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"""
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for part in mail_request.all_parts():
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self.attach_part(part)
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self.base.content_encoding = mail_request.base.content_encoding.copy()
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def clear(self):
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"""
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Clears out the attachments so you can redo them. Use this to keep the
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headers for a series of different messages with different attachments.
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"""
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del self.attachments[:]
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del self.base.parts[:]
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self.multipart = False
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def update(self, message):
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"""
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Used to easily set a bunch of heading from another dict
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like object.
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"""
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for k in message.keys():
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self.base[k] = message[k]
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def __str__(self):
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"""
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Converts to a string.
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"""
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return self.to_message().as_string()
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def _encode_attachment(self, filename=None, content_type=None, data=None,
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disposition=None, part=None):
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"""
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Used internally to take the attachments mentioned in self.attachments
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and do the actual encoding in a lazy way when you call to_message.
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"""
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if part:
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self.base.parts.append(part)
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elif filename:
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if not data:
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data = open(filename).read()
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self.base.attach_file(filename, data, content_type,
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disposition or 'attachment')
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else:
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self.base.attach_text(data, content_type)
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ctype = self.base.content_encoding['Content-Type'][0]
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if ctype and not ctype.startswith('multipart'):
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self.base.content_encoding['Content-Type'] = ('multipart/mixed', {})
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def to_message(self):
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"""
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Figures out all the required steps to finally craft the
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message you need and return it. The resulting message
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is also available as a self.base attribute.
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What is returned is a Python email API message you can
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use with those APIs. The self.base attribute is the raw
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lamson.encoding.MailBase.
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"""
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del self.base.parts[:]
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if self.Body and self.Html:
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self.multipart = True
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self.base.content_encoding['Content-Type'] = (
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'multipart/alternative', {})
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if self.multipart:
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self.base.body = None
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if self.Body:
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self.base.attach_text(self.Body, 'text/plain')
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if self.Html:
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self.base.attach_text(self.Html, 'text/html')
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for args in self.attachments:
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self._encode_attachment(**args)
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elif self.Body:
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self.base.body = self.Body
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self.base.content_encoding['Content-Type'] = ('text/plain', {})
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elif self.Html:
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self.base.body = self.Html
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self.base.content_encoding['Content-Type'] = ('text/html', {})
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return to_message(self.base)
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def all_parts(self):
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"""
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Returns all the encoded parts. Only useful for debugging
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or inspecting after calling to_message().
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"""
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return self.base.parts
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def keys(self):
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return self.base.keys()
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def to_message(mail):
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"""
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Given a MailBase message, this will construct a MIMEPart
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that is canonicalized for use with the Python email API.
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"""
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ctype, params = mail.content_encoding['Content-Type']
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if not ctype:
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if mail.parts:
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ctype = 'multipart/mixed'
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else:
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ctype = 'text/plain'
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else:
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if mail.parts:
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assert ctype.startswith(("multipart", "message")), \
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"Content type should be multipart or message, not %r" % ctype
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# adjust the content type according to what it should be now
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mail.content_encoding['Content-Type'] = (ctype, params)
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try:
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out = MIMEPart(ctype, **params)
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except TypeError, exc: # pragma: no cover
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raise EncodingError("Content-Type malformed, not allowed: %r; "
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"%r (Python ERROR: %s" %
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(ctype, params, exc.message))
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for k in mail.keys():
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if k in ADDRESS_HEADERS_WHITELIST:
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out[k.encode('ascii')] = header_to_mime_encoding(mail[k])
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else:
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out[k.encode('ascii')] = header_to_mime_encoding(mail[k],
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not_email=True)
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out.extract_payload(mail)
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# go through the children
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for part in mail.parts:
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out.attach(to_message(part))
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return out
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class MIMEPart(MIMEBase):
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"""
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A reimplementation of nearly everything in email.mime to be more useful
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for actually attaching things. Rather than one class for every type of
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thing you'd encode, there's just this one, and it figures out how to
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encode what you ask it.
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"""
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def __init__(self, type, **params):
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self.maintype, self.subtype = type.split('/')
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MIMEBase.__init__(self, self.maintype, self.subtype, **params)
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def add_text(self, content):
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# this is text, so encode it in canonical form
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try:
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encoded = content.encode('ascii')
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charset = 'ascii'
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except UnicodeError:
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encoded = content.encode('utf-8')
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charset = 'utf-8'
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self.set_payload(encoded, charset=charset)
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def extract_payload(self, mail):
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if mail.body == None: return # only None, '' is still ok
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ctype, ctype_params = mail.content_encoding['Content-Type']
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cdisp, cdisp_params = mail.content_encoding['Content-Disposition']
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assert ctype, ("Extract payload requires that mail.content_encoding "
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"have a valid Content-Type.")
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if ctype.startswith("text/"):
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self.add_text(mail.body)
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else:
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if cdisp:
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# replicate the content-disposition settings
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self.add_header('Content-Disposition', cdisp, **cdisp_params)
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self.set_payload(mail.body)
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encoders.encode_base64(self)
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def __repr__(self):
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return "<MIMEPart '%s/%s': %r, %r, multipart=%r>" % (
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self.subtype,
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self.maintype,
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self['Content-Type'],
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self['Content-Disposition'],
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self.is_multipart())
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def header_to_mime_encoding(value, not_email=False):
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if not value: return ""
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encoder = Charset(DEFAULT_ENCODING)
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if type(value) == list:
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return "; ".join(properly_encode_header(
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v, encoder, not_email) for v in value)
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else:
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return properly_encode_header(value, encoder, not_email)
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def properly_encode_header(value, encoder, not_email):
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"""
|
|
|
The only thing special (weird) about this function is that it tries
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|
to do a fast check to see if the header value has an email address in
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|
it. Since random headers could have an email address, and email addresses
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have weird special formatting rules, we have to check for it.
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|
Normally this works fine, but in Librelist, we need to "obfuscate" email
|
|
|
addresses by changing the '@' to '-AT-'. This is where
|
|
|
VALUE_IS_EMAIL_ADDRESS exists. It's a simple lambda returning True/False
|
|
|
to check if a header value has an email address. If you need to make this
|
|
|
check different, then change this.
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|
|
"""
|
|
|
try:
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|
|
return value.encode("ascii")
|
|
|
except UnicodeEncodeError:
|
|
|
if not_email is False and VALUE_IS_EMAIL_ADDRESS(value):
|
|
|
# this could have an email address, make sure we don't screw it up
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|
|
name, address = parseaddr(value)
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|
|
return '"%s" <%s>' % (
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|
|
encoder.header_encode(name.encode("utf-8")), address)
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|
|
return encoder.header_encode(value.encode("utf-8"))
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|
