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ba92580f01
<http://sf.net/projects/mimelib>. There /are/ API differences between mimelib and email, but most of the implementations are shared (except where cool Py2.2 stuff like generators are used).
422 lines
14 KiB
Python
422 lines
14 KiB
Python
# Copyright (C) 2001 Python Software Foundation
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# Author: barry@zope.com (Barry Warsaw)
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"""Basic message object for the email package object model.
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"""
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from __future__ import generators
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import re
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import base64
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import quopri
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from cStringIO import StringIO
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from types import ListType
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SEMISPACE = '; '
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# Intrapackage imports
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import Errors
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import Utils
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class Message:
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"""Basic message object for use inside the object tree.
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A message object is defined as something that has a bunch of RFC 2822
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headers and a payload. If the body of the message is a multipart, then
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the payload is a list of Messages, otherwise it is a string.
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These objects implement part of the `mapping' interface, which assumes
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there is exactly one occurrance of the header per message. Some headers
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do in fact appear multiple times (e.g. Received:) and for those headers,
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you must use the explicit API to set or get all the headers. Not all of
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the mapping methods are implemented.
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"""
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def __init__(self):
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self._headers = []
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self._unixfrom = None
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self._payload = None
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# Defaults for multipart messages
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self.preamble = self.epilogue = None
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def __str__(self):
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"""Return the entire formatted message as a string.
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This includes the headers, body, and `unixfrom' line.
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"""
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return self.as_string(unixfrom=1)
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def as_string(self, unixfrom=0):
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"""Return the entire formatted message as a string.
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Optional `unixfrom' when true, means include the Unix From_ envelope
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header.
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"""
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from Generator import Generator
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fp = StringIO()
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g = Generator(fp)
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g(self, unixfrom=unixfrom)
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return fp.getvalue()
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def is_multipart(self):
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"""Return true if the message consists of multiple parts."""
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if type(self._payload) is ListType:
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return 1
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return 0
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#
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# Unix From_ line
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#
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def set_unixfrom(self, unixfrom):
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self._unixfrom = unixfrom
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def get_unixfrom(self):
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return self._unixfrom
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#
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# Payload manipulation.
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#
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def add_payload(self, payload):
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"""Add the given payload to the current payload.
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If the current payload is empty, then the current payload will be made
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a scalar, set to the given value.
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"""
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if self._payload is None:
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self._payload = payload
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elif type(self._payload) is ListType:
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self._payload.append(payload)
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elif self.get_main_type() not in (None, 'multipart'):
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raise Errors.MultipartConversionError(
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'Message main Content-Type: must be "multipart" or missing')
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else:
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self._payload = [self._payload, payload]
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# A useful synonym
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attach = add_payload
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def get_payload(self, i=None, decode=0):
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"""Return the current payload exactly as is.
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Optional i returns that index into the payload.
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Optional decode is a flag indicating whether the payload should be
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decoded or not, according to the Content-Transfer-Encoding: header.
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When true and the message is not a multipart, the payload will be
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decoded if this header's value is `quoted-printable' or `base64'. If
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some other encoding is used, or the header is missing, the payload is
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returned as-is (undecoded). If the message is a multipart and the
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decode flag is true, then None is returned.
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"""
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if i is None:
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payload = self._payload
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elif type(self._payload) is not ListType:
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raise TypeError, i
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else:
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payload = self._payload[i]
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if decode:
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if self.is_multipart():
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return None
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cte = self.get('content-transfer-encoding', '')
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if cte.lower() == 'quoted-printable':
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return Utils._qdecode(payload)
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elif cte.lower() == 'base64':
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return Utils._bdecode(payload)
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# Everything else, including encodings with 8bit or 7bit are returned
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# unchanged.
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return payload
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def set_payload(self, payload):
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"""Set the payload to the given value."""
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self._payload = payload
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#
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# MAPPING INTERFACE (partial)
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#
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def __len__(self):
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"""Get the total number of headers, including duplicates."""
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return len(self._headers)
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def __getitem__(self, name):
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"""Get a header value.
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Return None if the header is missing instead of raising an exception.
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Note that if the header appeared multiple times, exactly which
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occurrance gets returned is undefined. Use getall() to get all
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the values matching a header field name.
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"""
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return self.get(name)
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def __setitem__(self, name, val):
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"""Set the value of a header.
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Note: this does not overwrite an existing header with the same field
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name. Use __delitem__() first to delete any existing headers.
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"""
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self._headers.append((name, val))
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def __delitem__(self, name):
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"""Delete all occurrences of a header, if present.
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Does not raise an exception if the header is missing.
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"""
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name = name.lower()
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newheaders = []
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for k, v in self._headers:
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if k.lower() <> name:
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newheaders.append((k, v))
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self._headers = newheaders
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def __contains__(self, key):
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return key.lower() in [k.lower() for k, v in self._headers]
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def has_key(self, name):
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"""Return true if the message contains the header."""
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return self[name] <> None
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def keys(self):
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"""Return a list of all the message's header field names.
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These will be sorted in the order they appeared in the original
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message, and may contain duplicates. Any fields deleted and
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re-inserted are always appended to the header list.
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"""
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return [k for k, v in self._headers]
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def values(self):
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"""Return a list of all the message's header values.
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These will be sorted in the order they appeared in the original
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message, and may contain duplicates. Any fields deleted and
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re-inserted are alwyas appended to the header list.
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"""
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return [v for k, v in self._headers]
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def items(self):
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"""Get all the message's header fields and values.
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These will be sorted in the order they appeared in the original
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message, and may contain duplicates. Any fields deleted and
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re-inserted are alwyas appended to the header list.
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"""
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return self._headers[:]
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def get(self, name, failobj=None):
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"""Get a header value.
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Like __getitem__() but return failobj instead of None when the field
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is missing.
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"""
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name = name.lower()
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for k, v in self._headers:
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if k.lower() == name:
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return v
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return failobj
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#
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# Additional useful stuff
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#
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def get_all(self, name, failobj=None):
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"""Return a list of all the values for the named field.
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These will be sorted in the order they appeared in the original
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message, and may contain duplicates. Any fields deleted and
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re-inserted are alwyas appended to the header list.
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"""
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values = []
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name = name.lower()
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for k, v in self._headers:
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if k.lower() == name:
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values.append(v)
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return values
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def add_header(self, _name, _value, **_params):
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"""Extended header setting.
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name is the header field to add. keyword arguments can be used to set
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additional parameters for the header field, with underscores converted
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to dashes. Normally the parameter will be added as key="value" unless
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value is None, in which case only the key will be added.
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Example:
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msg.add_header('content-disposition', 'attachment', filename='bud.gif')
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"""
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parts = []
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for k, v in _params.items():
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if v is None:
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parts.append(k.replace('_', '-'))
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else:
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parts.append('%s="%s"' % (k.replace('_', '-'), v))
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if _value is not None:
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parts.insert(0, _value)
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self._headers.append((_name, SEMISPACE.join(parts)))
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def get_type(self, failobj=None):
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"""Returns the message's content type.
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The returned string is coerced to lowercase and returned as a single
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string of the form `maintype/subtype'. If there was no Content-Type:
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header in the message, failobj is returned (defaults to None).
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"""
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missing = []
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value = self.get('content-type', missing)
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if value is missing:
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return failobj
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return re.split(r';\s+', value)[0].lower()
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def get_main_type(self, failobj=None):
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"""Return the message's main content type if present."""
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missing = []
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ctype = self.get_type(missing)
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if ctype is missing:
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return failobj
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parts = ctype.split('/')
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if len(parts) > 0:
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return ctype.split('/')[0]
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return failobj
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def get_subtype(self, failobj=None):
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"""Return the message's content subtype if present."""
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missing = []
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ctype = self.get_type(missing)
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if ctype is missing:
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return failobj
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parts = ctype.split('/')
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if len(parts) > 1:
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return ctype.split('/')[1]
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return failobj
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def get_params(self, failobj=None, header='content-type'):
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"""Return the message's Content-Type: parameters, as a list.
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Optional failobj is the object to return if there is no Content-Type:
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header. Optional header is the header to search instead of
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Content-Type:
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"""
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missing = []
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value = self.get(header, missing)
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if value is missing:
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return failobj
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return re.split(r';\s+', value)[1:]
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def get_param(self, param, failobj=None, header='content-type'):
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"""Return the parameter value if found in the Content-Type: header.
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Optional failobj is the object to return if there is no Content-Type:
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header. Optional header is the header to search instead of
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Content-Type:
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"""
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param = param.lower()
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missing = []
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params = self.get_params(missing, header=header)
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if params is missing:
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return failobj
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for p in params:
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try:
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name, val = p.split('=', 1)
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except ValueError:
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# Must have been a bare attribute
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name = p
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val = ''
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if name.lower() == param:
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return Utils.unquote(val)
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return failobj
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def get_filename(self, failobj=None):
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"""Return the filename associated with the payload if present.
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The filename is extracted from the Content-Disposition: header's
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`filename' parameter, and it is unquoted.
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"""
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missing = []
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filename = self.get_param('filename', missing, 'content-disposition')
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if filename is missing:
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return failobj
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return Utils.unquote(filename.strip())
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def get_boundary(self, failobj=None):
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"""Return the boundary associated with the payload if present.
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The boundary is extracted from the Content-Type: header's `boundary'
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parameter, and it is unquoted.
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"""
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missing = []
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boundary = self.get_param('boundary', missing)
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if boundary is missing:
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return failobj
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return Utils.unquote(boundary.strip())
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def set_boundary(self, boundary):
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"""Set the boundary parameter in Content-Type: to 'boundary'.
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This is subtly different than deleting the Content-Type: header and
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adding a new one with a new boundary parameter via add_header(). The
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main difference is that using the set_boundary() method preserves the
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order of the Content-Type: header in the original message.
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HeaderParseError is raised if the message has no Content-Type: header.
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"""
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params = self.get_params()
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if not params:
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# There was no Content-Type: header, and we don't know what type
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# to set it to, so raise an exception.
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raise Errors.HeaderParseError, 'No Content-Type: header found'
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newparams = []
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foundp = 0
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for p in params:
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if p.lower().startswith('boundary='):
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newparams.append('boundary="%s"' % boundary)
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foundp = 1
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else:
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newparams.append(p)
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if not foundp:
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# The original Content-Type: header had no boundary attribute.
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# Tack one one the end. BAW: should we raise an exception
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# instead???
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newparams.append('boundary="%s"' % boundary)
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# Replace the existing Content-Type: header with the new value
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newheaders = []
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for h, v in self._headers:
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if h.lower() == 'content-type':
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value = v.split(';', 1)[0]
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newparams.insert(0, value)
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newheaders.append((h, SEMISPACE.join(newparams)))
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else:
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newheaders.append((h, v))
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self._headers = newheaders
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def walk(self):
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"""Walk over the message tree, yielding each subpart.
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The walk is performed in breadth-first order. This method is a
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generator.
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"""
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if self.is_multipart():
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for subpart in self.get_payload():
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for subsubpart in subpart.walk():
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yield subsubpart
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else:
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yield self
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def get_charsets(self, failobj=None):
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"""Return a list containing the charset(s) used in this message.
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The returned list of items describes the Content-Type: headers'
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charset parameter for this message and all the subparts in its
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payload.
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Each item will either be a string (the value of the charset parameter
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in the Content-Type: header of that part) or the value of the
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'failobj' parameter (defaults to None), if the part does not have a
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main MIME type of "text", or the charset is not defined.
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The list will contain one string for each part of the message, plus
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one for the container message (i.e. self), so that a non-multipart
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message will still return a list of length 1.
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"""
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return [part.get_param('charset', failobj) for part in self.walk()]
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