One document matched: draft-melnikov-imap-ext-abnf-00.txt
Internet Draft A. Melnikov
Document: draft-melnikov-imap-ext-abnf Isode Ltd
Expires: September 2005 March 2005
Collected extensions to IMAP4 ABNF
draft-melnikov-imap-ext-abnf-00
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Abstract
Over years many documents from IMAPEXT and LEMONADE working groups,
as well as many individual documents have added syntactic
extensions to many base IMAP commands described in RFC 3501. For
ease of reference this document collects most of such ABNF changes
in one place.
This document updates ABNF in RFC 3501.
Table of Contents
1. Conventions Used in this Document 2
2. IMAP ABNF extensions 2
2.1 Optional parameters with the SELECT/EXAMINE commands 2
2.2 Extensions to FETCH and UID FETCH Commands 3
2.3 Extensions to STORE and UID STORE Commands 4
2.4 Extensions to SEARCH Command 4
3. Formal Syntax 5
4. Security Considerations 7
5. IANA Considerations 7
6. References 7
6.1 Normative References 7
7. Acknowledgments 7
8. Author's Addresses 8
9. Full Copyright Statement 8
10. Intellectual Property 8
11. Appendix A. Editorial. 9
11.1 Change Log 9
1. Conventions Used in this Document
In examples, "C:" and "S:" indicate lines sent by the client and
server respectively.
The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT", and "MAY"
in this document are to be interpreted as defined in "Key words for
use in RFCs to Indicate Requirement Levels" [KEYWORDS].
<<Editorial comments and questions are enclosed like this>>
2. IMAP ABNF extensions
2.1 Optional parameters with the SELECT/EXAMINE commands
This documents adds the ability to include one or more parameters
with the IMAP SELECT or EXAMINE commands, to turn on or off certain
standard behaviour, or to add new optional behaviours required for
a particular extension.
There are two possible modes of operation:
o A global state change where a single use of the optional
parameter will effect the session state from that time on,
irrespective of subsequent SELECT/EXAMINE commands.
o A per-mailbox state change that will effect the session only for
the duration of the new selected state. A subsequent SELECT/
EXAMINE without the optional parameter will cancel its effect
For the newly selected mailbox.
Optional parameters to the SELECT or EXAMINE commands are added as
a parenthesised list of atoms or strings, and appear after the
mailbox name in the standard SELECT or EXAMINE command. The order
of individual parameters is arbitrary. Individual parameters may
consist of one or more atoms or strings in a specific order. If a
parameter consists of more than one atom or string, it MUST appear
in its own parenthesised list. Any parameter not defined by
extensions that the server supports MUST be rejected with a NO
response.
Example:
C: a SELECT INBOX (ANNOTATE)
S: ...
S: a OK SELECT complete
In the above example, a single parameter is used with the SELECT
command.
Example:
C: a EXAMINE INBOX (ANNOTATE (RESPONSES "UID Responses")
CONDSTORE)
S: ...
S: a OK EXAMINE complete
In the above example, three parameters are used with the EXAMINE
command. The second parameter consists of two items: an atom
followed by a quoted string.
Example:
C: a SELECT INBOX (BLURDYBLOOP)
S: a NO Unknown parameter in SELECT command
In the above example, a parameter not supported by the server is
incorrectly used.
2.2 Extensions to FETCH and UID FETCH Commands
Arguments: sequence set
message data item names or macro
OPTIONAL fetch modifiers
Responses: untagged responses: FETCH
Result: OK - fetch completed
NO - fetch error: can't fetch that data
BAD - command unknown or arguments invalid
This document extends the syntax of the FETCH and UID FETCH
commands (see section 6.4.5 of [IMAP4]) to include optional FETCH
modifiers. No fetch modifiers are defined in this document.
2.3 Extensions to STORE and UID STORE Commands
Arguments: message set
OPTIONAL store modifiers
message data item name
value for message data item
Responses: untagged responses: FETCH
Result: OK - store completed
NO - store error: can't store that data
BAD - command unknown or arguments invalid
This document extends the syntax of the STORE and UID STORE
commands (see section 6.4.6 of [IMAP4]) to include optional STORE
modifiers. No store modifiers are defined in this document.
2.4 Extensions to SEARCH Command
Arguments: OPTIONAL result specifier
OPTIONAL [CHARSET] specification
searching criteria (one or more)
Responses: REQUIRED untagged response: SEARCH or ESEARCH
Result: OK - search completed
NO - search error: can't search that [CHARSET] or
criteria
BAD - command unknown or arguments invalid
This section updates definition of the SEARCH command described in
section 6.4.4 of [IMAP4].
The SEARCH command is extended to allow for result options. This
document doesn't define any result option.
3. Formal Syntax
The following syntax specification uses the Augmented Backus-Naur
Form (ABNF) notation as specified in [ABNF].
Non-terminals referenced but not defined below are as defined by
[IMAP4].
Except as noted otherwise, all alphabetic characters are case-
insensitive. The use of upper or lower case characters to define
token strings is for editorial clarity only. Implementations MUST
accept these strings in a case-insensitive fashion.
append = "APPEND" SP mailbox 1*append-message
;; only a single append-message may appear
;; if MULTIAPPEND [MULTIAPPEND] capability
;; is not present
append-message = append-opts SP append-data
append-ext = ;; is arbitrary bounded syntax to be defined
;; by extensions. This MUST start with an
;; an atom.
append-data = literal
append-opts = [SP flag-list] [SP date-time] *(SP append-ext)
examine = "EXAMINE" SP mailbox [select-params]
;; modifies the original IMAP EXAMINE command
;; to accept optional parameters
fetch = "FETCH" SP sequence-set SP ("ALL" / "FULL" /
"FAST" / fetch-att /
"(" fetch-att *(SP fetch-att) ")")
[SP fetch-modifiers]
;; modifies the original IMAP4 FETCH command to
;; accept optional modifiers
fetch-modifiers = "(" fetch-modifier *(SP fetch-modifier) ")"
fetch-modifier = fetch-modifier-name /
fetch-modifier-name SP astring /
fetch-modifier-name SP "(" fetch-modif-params
")"
;; modifiers to FETCH may contain a modifier
;; name followed by zero or more atoms or
;; strings - multiple items are always
;; parenthesised, nesting is allowed
fetch-modif-params = astring *(SP astring) /
"(" fetch-modif-params
*(SP fetch-modif-params) ")"
fetch-modifier-name = atom
search = "SEARCH" [search-return-opts]
[SP "CHARSET" SP astring] 1*(SP search-key)
;; CHARSET argument to MUST be registered
;; with IANA
search-return-opts = "RETURN" SP "(" [search-return-opt
*(SP search-return-opt)] ")"
;; SEARCH return options, e.g. MIN
search-return-opt = search-modifier-name
[SP "(" search-mod-params ")"]
search-modifier-name = atom
search-mod-params = astring /
search-mod-params
*(SP search-mod-params) /
"(" search-mod-params ")"
;; same structure as for store-modparam-comp
select = "SELECT" SP mailbox [select-params]
;; modifies the original IMAP SELECT command to
;; accept optional parameters
select-params = SP "(" select-param *(SP select-param) ")"
select-param = astring / "(" astring 1*(SP astring) ")"
;; parameters to SELECT may contain one or
;; more atoms or strings - multiple items
;; are always parenthesised
status = "STATUS" SP mailbox SP
"(" status-att-req *(SP status-att-req) ")"
;; redefine STATUS command syntax defined in
;; [IMAP4]
status-att-list = status-rsp-info *(SP status-rsp-info)
;; Redefines status-att-list from RFC 3501
status-att-req = status-att
status-rsp-info = status-att SP number
store = "STORE" SP sequence-set store-modifiers
SP store-att-flags
;; extend [IMAP4] STORE command syntax
;; to allow for optional store-modifiers
store-modifiers = [ SP "(" store-modifier *(SP store-modifier)
")" ]
store-modifier = store-modifier-name [SP store-modif-params]
;; MUST start with atom (label)
store-modif-params = astring / "(" store-modparam-comp ")"
store-modparam-comp = astring /
store-modparam-comp
*(SP store-modparam-comp) /
"(" store-modparam-comp ")"
<<This differs from how fetch-modif-params is defined. Is this
desirable? Or should we use something simpler, e.g select-
param?>>
store-modifier-name = atom
<<select/examine ABNF in ANNOTATE is wrong>>
<<Add LOGIN/AUTHENTICATE, LOGOUT and CREATE?>>
4. Security Considerations
It is believed that this document doesn't add any new security
concerns that were not already identified in RFC 3501.
5. IANA Considerations
This document doesn't define any new IMAP extension, so no action
from IANA is required.
6. References
6.1 Normative References
[KEYWORDS] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997.
[IMAP4], Crispin, M., "Internet Message Access Protocol - Version
4rev1", RFC 3501, University of Washington, March 2003.
[ABNF], DRUMS working group, Dave Crocker Editor, "Augmented BNF
for Syntax Specifications: ABNF", Work in Progress.
[MULTIAPPEND] Crispin, M., "Internet Message Access Protocol
(IMAP) - MULTIAPPEND Extension", RFC 3502, March 2003.
7. Acknowledgments
This documents is based on ideas proposed by Cyrus Daboo, Pete
Resnick, Mark Crispin, Ken Murchison, Philip Guenther, Randall
Gellens.
However all errors and omissions must be attributed to the author
of the document.
Some text was borrowed from draft-ietf-imapext-annotate-12.txt
8. Author's Addresses
Alexey Melnikov
Isode Limited
5 Castle Business Village
36 Station Road
Hampton, Middlesex, TW12 2BX
UK
Email: Alexey.Melnikov@isode.com
9. Full Copyright Statement
Copyright (C) The Internet Society (2005). This document is
subject to the rights, licenses and restrictions contained in BCP
78, and except as set forth therein, the authors retain all their
rights.
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REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT
THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR
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PARTICULAR PURPOSE.
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Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
11. Appendix A. Editorial.
<<Note that this section will be deleted before publication>>
11.1 Change Log
00 Initial Revision.
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