twisted.mail.imap4

An IMAP4 protocol implementation

Author

Jp Calderone

To do:

 Suspend idle timeout while server is processing
 Use an async message parser instead of buffering in memory
 Figure out a way to not queue multi-message client requests (Flow? A simple callback?)
 Clarify some API docs (Query, etc)
 Make APPEND recognize (again) non-existent mailboxes before accepting the literal

Class	IMAP4Exception	Undocumented
Class	IllegalClientResponse	Undocumented
Class	IllegalOperation	Undocumented
Class	MailboxException	Undocumented
Class	IllegalMailboxEncoding	Undocumented
Class	MailboxCollision	Undocumented
Class	NoSuchMailbox	Undocumented
Class	ReadOnlyMailbox	Undocumented
Class	UnhandledResponse	Undocumented
Class	NegativeResponse	Undocumented
Class	NoSupportedAuthentication	Undocumented
Class	IllegalIdentifierError	Undocumented
Class	IllegalQueryError	Undocumented
Class	MismatchedNesting	Undocumented
Class	MismatchedQuoting	Undocumented
Class	IllegalServerResponse	Undocumented
Class	MessageSet	A set of message identifiers usable by both `IMAP4Client` and `IMAP4Server` via `IMailboxIMAP.store` and `IMailboxIMAP.fetch`.
Class	LiteralString	No class docstring; 1/3 methods documented
Class	LiteralFile	No class docstring; 1/3 methods documented
Class	WriteBuffer	Buffer up a bunch of writes before sending them all to a transport at once.
Class	Command	Undocumented
Class	IMAP4Server	Protocol implementation for an IMAP4rev1 server.
Class	IMAP4Client	IMAP4 client protocol implementation
Function	parseIdList	Parse a message set search key into a `MessageSet`.
Function	Query	Create a query string
Function	Or	The disjunction of two or more queries
Function	Not	The negation of a query
Function	wildcardToRegexp	Undocumented
Function	splitQuoted	Split a string into whitespace delimited tokens
Function	splitOn	Undocumented
Function	collapseStrings	Turns a list of length-one strings and lists into a list of longer strings and lists. For example,
Function	parseNestedParens	Parse an s-exp-like string into a more useful data structure.
Class	DontQuoteMe	Undocumented
Function	collapseNestedLists	Turn a nested list structure into an s-exp-like string.
Class	MemoryAccountWithoutNamespaces	Undocumented
Class	MemoryAccount	Undocumented
Function	statusRequestHelper	Undocumented
Function	parseAddr	Undocumented
Function	getEnvelope	Undocumented
Function	getLineCount	Undocumented
Function	unquote	Undocumented
Function	getBodyStructure	RFC 3501, 7.4.2, BODYSTRUCTURE:
Function	subparts	Undocumented
Function	iterateInReactor	Consume an interator at most a single iteration per reactor iteration.
Class	MessageProducer	No class docstring; 1/3 methods documented
Class	FileProducer	No class docstring; 2/6 methods documented
Function	parseTime	Undocumented
Function	modified_base64	Undocumented
Function	modified_unbase64	Undocumented
Function	encoder	Encode the given `unicode` string using the IMAP4 specific variation of UTF-7.
Function	decoder	Decode the given `str` using the IMAP4 specific variation of UTF-7.
Class	StreamReader	Undocumented
Class	StreamWriter	Undocumented
Function	imap4_utf_7	Undocumented
Function	_swap	Swap `this` with `that` if `this` is `ifIs`.
Function	_swapAllPairs	Swap each element in each pair in `of` with `that` it is `ifIs`.
Function	_quote	Undocumented
Function	_literal	Undocumented
Function	_needsQuote	Undocumented
Function	_parseMbox	Undocumented
Function	_prepareMailboxName	Undocumented
Function	_needsLiteral	Undocumented
Function	_getContentType	Return a two-tuple of the main and subtype of the given message.
Function	_getMessageStructure	Construct an appropriate type of message structure object for the given message object.
Class	_MessageStructure	`_MessageStructure` is a helper base class for message structure classes representing the structure of particular kinds of messages, as defined by their MIME type.
Class	_SinglepartMessageStructure	`_SinglepartMessageStructure` represents the message structure of a non-multipart/* message.
Class	_TextMessageStructure	`_TextMessageStructure` represents the message structure of a text/* message.
Class	_RFC822MessageStructure	`_RFC822MessageStructure` represents the message structure of a message/rfc822 message.
Class	_MultipartMessageStructure	`_MultipartMessageStructure` represents the message structure of a multipart/* message.
Function	_formatHeaders	Undocumented
Class	_FetchParser	Undocumented

def _swap(this, that, ifIs):

Swap this with that if this is ifIs.

Parameters	this	The object that may be replaced.
	that	The object that may replace `this`.
	ifIs	An object whose identity will be compared to `this`.

def _swapAllPairs(of, that, ifIs):

Swap each element in each pair in of with that it is ifIs.

Parameters	of	A list of 2-`tuple`s, whose members may be the object `that` (type: `list` of 2-`tuple`s)
	ifIs	An object whose identity will be compared to members of each pair in `of`
Returns	A `list` of 2-`tuple`s with all occurences of `ifIs` replaced with `that`

def parseIdList(s, lastMessageId=None):

Parse a message set search key into a MessageSet.

Parameters	s	A string description of an id list, for example "1:3, 4:*" (type: `bytes`)
	lastMessageId	The last message sequence id or UID, depending on whether we are parsing the list in UID or sequence id context. The caller should pass in the correct value. (type: `int`)
Returns	A `MessageSet` that contains the ids defined in the list (type: `MessageSet`)

def Query(sorted=0, **kwarg):

Create a query string

Among the accepted keywords are:

   all         : If set to a true value, search all messages in the
                 current mailbox

   answered    : If set to a true value, search messages flagged with
                 \Answered

   bcc         : A substring to search the BCC header field for

   before      : Search messages with an internal date before this
                 value.  The given date should be a string in the format
                 of 'DD-Mon-YYYY'.  For example, '03-Mar-2003'.

   body        : A substring to search the body of the messages for

   cc          : A substring to search the CC header field for

   deleted     : If set to a true value, search messages flagged with
                 \Deleted

   draft       : If set to a true value, search messages flagged with
                 \Draft

   flagged     : If set to a true value, search messages flagged with
                 \Flagged

   from        : A substring to search the From header field for

   header      : A two-tuple of a header name and substring to search
                 for in that header

   keyword     : Search for messages with the given keyword set

   larger      : Search for messages larger than this number of octets

   messages    : Search only the given message sequence set.

   new         : If set to a true value, search messages flagged with
                 \Recent but not \Seen

   old         : If set to a true value, search messages not flagged with
                 \Recent

   on          : Search messages with an internal date which is on this
                 date.  The given date should be a string in the format
                 of 'DD-Mon-YYYY'.  For example, '03-Mar-2003'.

   recent      : If set to a true value, search for messages flagged with
                 \Recent

   seen        : If set to a true value, search for messages flagged with
                 \Seen

   sentbefore  : Search for messages with an RFC822 'Date' header before
                 this date.  The given date should be a string in the format
                 of 'DD-Mon-YYYY'.  For example, '03-Mar-2003'.

   senton      : Search for messages with an RFC822 'Date' header which is
                 on this date  The given date should be a string in the format
                 of 'DD-Mon-YYYY'.  For example, '03-Mar-2003'.

   sentsince   : Search for messages with an RFC822 'Date' header which is
                 after this date.  The given date should be a string in the format
                 of 'DD-Mon-YYYY'.  For example, '03-Mar-2003'.

   since       : Search for messages with an internal date that is after
                 this date..  The given date should be a string in the format
                 of 'DD-Mon-YYYY'.  For example, '03-Mar-2003'.

   smaller     : Search for messages smaller than this number of octets

   subject     : A substring to search the 'subject' header for

   text        : A substring to search the entire message for

   to          : A substring to search the 'to' header for

   uid         : Search only the messages in the given message set

   unanswered  : If set to a true value, search for messages not
                 flagged with \Answered

   undeleted   : If set to a true value, search for messages not
                 flagged with \Deleted

   undraft     : If set to a true value, search for messages not
                 flagged with \Draft

   unflagged   : If set to a true value, search for messages not
                 flagged with \Flagged

   unkeyword   : Search for messages without the given keyword set

   unseen      : If set to a true value, search for messages not
                 flagged with \Seen

Parameters	sorted	If true, the output will be sorted, alphabetically. The standard does not require it, but it makes testing this function easier. The default is zero, and this should be acceptable for any application. (type: `bool`)
Returns	The formatted query string (type: `str`)

def Or(*args):

The disjunction of two or more queries

def Not(query):

The negation of a query

def wildcardToRegexp(wildcard, delim=None):

Undocumented

def splitQuoted(s):

Split a string into whitespace delimited tokens

Tokens that would otherwise be separated but are surrounded by " remain as a single token. Any token that is not quoted and is equal to "NIL" is tokenized as None.

Parameters	s	The string to be split (type: `bytes`)
Returns	A list of the resulting tokens (type: `list` of `bytes`)
Raises	MismatchedQuoting	Raised if an odd number of quotes are present

def splitOn(sequence, predicate, transformers):

Undocumented

def collapseStrings(results):

Turns a list of length-one strings and lists into a list of longer strings and lists. For example,

['a', 'b', ['c', 'd']] is returned as ['ab', ['cd']]

Parameters	results	The list to be collapsed (type: `list` of `bytes` and `list`)
Returns	A new list which is the collapsed form of `results` (type: `list` of `bytes` and `list`)

def parseNestedParens(s, handleLiteral=1):

Parse an s-exp-like string into a more useful data structure.

Parameters	s	The s-exp-like string to parse (type: `bytes`)
Returns	A list containing the tokens present in the input. (type: `list` of `bytes` and `list`)
Raises	MismatchedNesting	Raised if the number or placement of opening or closing parenthesis is invalid.

def _quote(s):

Undocumented

def _literal(s):

Undocumented

def _needsQuote(s):

Undocumented

def _parseMbox(name):

Undocumented

def _prepareMailboxName(name):

Undocumented

def _needsLiteral(s):

Undocumented

def collapseNestedLists(items):

Turn a nested list structure into an s-exp-like string.

Strings in items will be sent as literals if they contain CR or LF, otherwise they will be quoted. References to None in items will be translated to the atom NIL. Objects with a 'read' attribute will have it called on them with no arguments and the returned string will be inserted into the output as a literal. Integers will be converted to strings and inserted into the output unquoted. Instances of DontQuoteMe will be converted to strings and inserted into the output unquoted.

This function used to be much nicer, and only quote things that really needed to be quoted (and DontQuoteMe did not exist), however, many broken IMAP4 clients were unable to deal with this level of sophistication, forcing the current behavior to be adopted for practical reasons.

Returns (type: str)

def statusRequestHelper(mbox, names):

Undocumented

def parseAddr(addr):

Undocumented

def getEnvelope(msg):

Undocumented

def getLineCount(msg):

Undocumented

def unquote(s):

Undocumented

def _getContentType(msg):

Return a two-tuple of the main and subtype of the given message.

def _getMessageStructure(message):

Construct an appropriate type of message structure object for the given message object.

Parameters	message	A `IMessagePart` provider
Returns	A `_MessageStructure` instance of the most specific type available for the given message, determined by inspecting the MIME type of the message.

def getBodyStructure(msg, extended=False):

RFC 3501, 7.4.2, BODYSTRUCTURE:

 A parenthesized list that describes the [MIME-IMB] body structure of a
 message.  This is computed by the server by parsing the [MIME-IMB] header
 fields, defaulting various fields as necessary.

   For example, a simple text message of 48 lines and 2279 octets can have
   a body structure of: ("TEXT" "PLAIN" ("CHARSET" "US-ASCII") NIL NIL
   "7BIT" 2279 48)

This is represented as:

   ["TEXT", "PLAIN", ["CHARSET", "US-ASCII"], None, None, "7BIT", 2279, 48]

These basic fields are documented in the RFC as:

body type
A string giving the content media type name as defined in [MIME-IMB].
body subtype
A string giving the content subtype name as defined in [MIME-IMB].
body parameter parenthesized list
A parenthesized list of attribute/value pairs [e.g., ("foo" "bar" "baz" "rag") where "bar" is the value of "foo" and "rag" is the value of "baz"] as defined in [MIME-IMB].
body id
A string giving the content id as defined in [MIME-IMB].
body description
A string giving the content description as defined in [MIME-IMB].
body encoding
A string giving the content transfer encoding as defined in [MIME-IMB].
body size
A number giving the size of the body in octets. Note that this size is the size in its transfer encoding and not the resulting size after any decoding.

Put another way, the body structure is a list of seven elements. The semantics of the elements of this list are:

Byte string giving the major MIME type
Byte string giving the minor MIME type
A list giving the Content-Type parameters of the message
A byte string giving the content identifier for the message part, or None if it has no content identifier.
A byte string giving the content description for the message part, or None if it has no content description.
A byte string giving the Content-Encoding of the message body
An integer giving the number of octets in the message body

The RFC goes on:

   Multiple parts are indicated by parenthesis nesting.  Instead of a body
   type as the first element of the parenthesized list, there is a sequence
   of one or more nested body structures.  The second element of the
   parenthesized list is the multipart subtype (mixed, digest, parallel,
   alternative, etc.).

   For example, a two part message consisting of a text and a
   BASE64-encoded text attachment can have a body structure of: (("TEXT"
   "PLAIN" ("CHARSET" "US-ASCII") NIL NIL "7BIT" 1152 23)("TEXT" "PLAIN"
   ("CHARSET" "US-ASCII" "NAME" "cc.diff")
   "<960723163407.20117h@cac.washington.edu>" "Compiler diff" "BASE64" 4554
   73) "MIXED")

This is represented as:

   [["TEXT", "PLAIN", ["CHARSET", "US-ASCII"], None, None, "7BIT", 1152,
     23],
    ["TEXT", "PLAIN", ["CHARSET", "US-ASCII", "NAME", "cc.diff"],
     "<960723163407.20117h@cac.washington.edu>", "Compiler diff",
     "BASE64", 4554, 73],
    "MIXED"]

In other words, a list of N + 1 elements, where N is the number of parts in the message. The first N elements are structures as defined by the previous section. The last element is the minor MIME subtype of the multipart message.

Additionally, the RFC describes extension data:

   Extension data follows the multipart subtype.  Extension data is never
   returned with the BODY fetch, but can be returned with a BODYSTRUCTURE
   fetch.  Extension data, if present, MUST be in the defined order.

The extended flag controls whether extension data might be returned with the normal data.

def _formatHeaders(headers):

Undocumented

def subparts(m):

Undocumented

def iterateInReactor(i):

Consume an interator at most a single iteration per reactor iteration.

If the iterator produces a Deferred, the next iteration will not occur until the Deferred fires, otherwise the next iteration will be taken in the next reactor iteration.

Returns A deferred which fires (with None) when the iterator is exhausted or whose errback is called if there is an exception. (type: Deferred)

def parseTime(s):

Undocumented

def modified_base64(s):

Undocumented

def modified_unbase64(s):

Undocumented

def encoder(s, errors=None):

Encode the given unicode string using the IMAP4 specific variation of UTF-7.

Parameters	s	The text to encode. (type: `unicode`)
	errors	Policy for handling encoding errors. Currently ignored.
Returns	`tuple` of a `str` giving the encoded bytes and an `int` giving the number of code units consumed from the input.

def decoder(s, errors=None):

Decode the given str using the IMAP4 specific variation of UTF-7.

Parameters	s	The bytes to decode. (type: `str`)
	errors	Policy for handling decoding errors. Currently ignored.
Returns	a `tuple` of a `unicode` string giving the text which was decoded and an `int` giving the number of bytes consumed from the input.

def imap4_utf_7(name):

Undocumented

API Documentation for twisted, generated by pydoctor at 2020-03-25 17:34:30.

twisted.mail.imap4 module documentation

`twisted.mail.imap4` module documentation