Internet Engineering Task Force I. Radu, Ed. Internet-Draft April 20, 2010 Intended status: Informational Expires: October 22, 2010 Advanced Groupware Access Protocol draft-iulian-advanced-groupware-access-protocol-00 Abstract The Advanced Groupware Access Protocol, (AGAP) allows a client to access and store electronic mail messages, contacts, events, files, and configurations on a server. The electronic mail messages can be grouped in folders. AGAP also provides the capability for an offline client to resynchronize with the server. AGAP does not specify a means of posting electronic mail messages; this function is handled by a mail transfer protocol such as SMTP [RFC2821]. It also does not specify a means for exchanging messages with contacts that are reported as being online; this function is handled by an instant messaging protocol such as XMPP [RFC3921]. AGAP includes the following operations for electronic mail messages: creating, deleting, renaming, moving and coping mail folders; checking for new messages; permanently removing messages; moving and coping messages between folders; fetching information about a message; setting and clearing tags for messages; searching in messages; retrieving only a part of a message; marking messages as spam; deleting attachments from a message. AGAP includes the following operations to manipulate the contacts: creating, deleting, moving, coping, tagging, and searching contacts; checking if a contact is online; fetching information about a contact. AGAP includes the following operations related to the use of the events: creating, deleting, moving, coping and tagging events in calendar; fetching events details; searching for events. All entries are read and written in format XML encoded UTF-8 [RFC3629] and each entry is identified by a unique alphanumeric identifier. AGAP is designed to support access only to a single server per connection. It is also designed to balance the volume of text exchanged between the server and clients and its readability by humans for debugging. Radu Expires October 22, 2010 [Page 1] Internet-Draft AGAP April 2010 Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on October 22, 2010. Copyright Notice Copyright (c) 2010 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Radu Expires October 22, 2010 [Page 2] Internet-Draft AGAP April 2010 Table of Contents 1. How to Read This Document . . . . . . . . . . . . . . . . 6 1.1. Organization of This Document . . . . . . . . . . . . . . 6 1.2. Conventions Used in This Document . . . . . . . . . . . . 6 2. Protocol Overview . . . . . . . . . . . . . . . . . . . . 6 2.1. Charset Used for Commands and Responses . . . . . . . . . 6 2.2. Maximal Length of a Command or Response Line . . . . . . . 7 2.3. Numbers in Commands and Responses . . . . . . . . . . . . 7 2.4. Regular Expressions in Commands . . . . . . . . . . . . . 7 2.5. Unique Identification Numbers . . . . . . . . . . . . . . 9 2.6. Folders . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6.1. Naming . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6.2. Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6.3. Folder Types . . . . . . . . . . . . . . . . . . . . . . . 10 2.6.4. Reserved Folders . . . . . . . . . . . . . . . . . . . . . 10 2.7. Tags . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.7.1. Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.7.2. Reserved Tag Names . . . . . . . . . . . . . . . . . . . . 11 2.8. The Responses for Each Type of Folder . . . . . . . . . . 12 2.8.1. Format and Conventions . . . . . . . . . . . . . . . . . . 12 2.8.2. Response for Configuration Folders . . . . . . . . . . . . 12 2.8.3. Response for Contact Folders . . . . . . . . . . . . . . . 13 2.8.4. Response for Event (Calendar, Journal, Task) Folders . . . 14 2.8.5. Response for File Folders . . . . . . . . . . . . . . . . 16 2.8.6. Response for Filter Folders . . . . . . . . . . . . . . . 16 2.8.7. Response for Message Folders . . . . . . . . . . . . . . . 17 2.8.8. Response for Note Folders . . . . . . . . . . . . . . . . 20 3. States . . . . . . . . . . . . . . . . . . . . . . . . . . 20 3.1. Non-authenticated State . . . . . . . . . . . . . . . . . 20 3.2. Pre-authentication State . . . . . . . . . . . . . . . . . 21 3.3. Authenticated (and Selected) State . . . . . . . . . . . . 21 3.4. (Authenticated but) Not-selected State . . . . . . . . . . 22 4. Commands . . . . . . . . . . . . . . . . . . . . . . . . . 22 4.1. Semantic and Syntax . . . . . . . . . . . . . . . . . . . 22 4.2. Syntax of a Tag List . . . . . . . . . . . . . . . . . . . 22 4.3. Syntax of a Filter . . . . . . . . . . . . . . . . . . . . 23 4.3.1. Syntax of a Filter for a Command . . . . . . . . . . . . . 23 4.3.2. Syntax of a Filter for a FILT Folder . . . . . . . . . . . 24 4.4. The Welcome Message - not-authenticated state . . . . . . 26 4.5. Command QUIT - all states . . . . . . . . . . . . . . . . 27 4.6. Command AUTH mechanism - not-authenticated state . . . . . 28 4.7. Command CAPA - not-authenticated state . . . . . . . . . . 28 4.8. Command SGZP - not-authenticated state . . . . . . . . . . 29 4.9. Command STLS - not-authenticated state . . . . . . . . . . 30 4.10. Command PASS password - pre-authenticated state (PLAIN) . 30 4.11. Command USER account - pre-authenticated state (PLAIN) . . 32 4.12. Command COPY - authenticated state . . . . . . . . . . . . 33 Radu Expires October 22, 2010 [Page 3] Internet-Draft AGAP April 2010 4.13. Command CPYF - authenticated state . . . . . . . . . . . . 34 4.14. Command DATT - authenticated state (MESG folder type) . . 35 4.15. Command DELE - authenticated state . . . . . . . . . . . . 36 4.16. Command DELF - authenticated state . . . . . . . . . . . . 37 4.17. Command EXIT - authenticated state . . . . . . . . . . . . 38 4.18. Command FCPY - authenticated state . . . . . . . . . . . . 38 4.19. Command FDEL - authenticated state . . . . . . . . . . . . 39 4.20. Command FIND - authenticated state . . . . . . . . . . . . 40 4.21. Command FMOV - authenticated state . . . . . . . . . . . . 41 4.22. Command FTAG - authenticated state . . . . . . . . . . . . 42 4.23. Command GTAG - authenticated state . . . . . . . . . . . . 43 4.24. Command LIST - authenticated and not-selected state . . . 44 4.25. Command MAKE - authenticated state . . . . . . . . . . . . 45 4.26. Command MOVE - authenticated state . . . . . . . . . . . . 47 4.27. Command MOVF - authenticated state . . . . . . . . . . . . 48 4.28. Command NAME - authenticated state . . . . . . . . . . . . 49 4.29. Command NOOP - authenticated state . . . . . . . . . . . . 50 4.30. Command RETR - authenticated state . . . . . . . . . . . . 50 4.31. Command SLCT - authenticated and not-selected state . . . 52 4.32. Command SPAM - authenticated state (MESG folder type) . . 53 4.33. Command STAG - authenticated state . . . . . . . . . . . . 54 4.34. Command STAT - authenticated state . . . . . . . . . . . . 55 4.35. Command STOR - authenticated state . . . . . . . . . . . . 56 5. Responses . . . . . . . . . . . . . . . . . . . . . . . . 57 5.1. Semantic and Syntax . . . . . . . . . . . . . . . . . . . 57 5.2. 1xx Informational . . . . . . . . . . . . . . . . . . . . 58 5.2.1. 100 Reserved . . . . . . . . . . . . . . . . . . . . . . . 58 5.2.2. 110 Continue . . . . . . . . . . . . . . . . . . . . . . . 58 5.3. 2xx Success . . . . . . . . . . . . . . . . . . . . . . . 58 5.3.1. 200 OK . . . . . . . . . . . . . . . . . . . . . . . . . . 58 5.4. 4xx Temporary Server Error . . . . . . . . . . . . . . . . 58 5.4.1. 400 Reserved . . . . . . . . . . . . . . . . . . . . . . . 58 5.4.2. 401 Internal Error . . . . . . . . . . . . . . . . . . . . 58 5.4.3. 410 Retry later . . . . . . . . . . . . . . . . . . . . . 58 5.5. 5xx Permanent Server Error . . . . . . . . . . . . . . . . 59 5.5.1. 500 Reserved . . . . . . . . . . . . . . . . . . . . . . . 59 5.5.2. 510 Unknown Command . . . . . . . . . . . . . . . . . . . 59 5.5.3. 511 Invalid Parameter . . . . . . . . . . . . . . . . . . 59 5.5.4. 512 Out of order . . . . . . . . . . . . . . . . . . . . . 59 5.5.5. 521 Not found . . . . . . . . . . . . . . . . . . . . . . 59 5.5.6. 531 Banned . . . . . . . . . . . . . . . . . . . . . . . . 59 6. All Possible Response Codes for All Commands . . . . . . . 59 6.1. Non-authenticated State . . . . . . . . . . . . . . . . . 59 6.2. Pre-authenticating State (PLAIN method) . . . . . . . . . 60 6.3. Authenticated State . . . . . . . . . . . . . . . . . . . 60 6.4. Not-selected State . . . . . . . . . . . . . . . . . . . . 62 7. Example of Conversations . . . . . . . . . . . . . . . . . 62 7.1. Successful connection and authentication . . . . . . . . . 62 Radu Expires October 22, 2010 [Page 4] Internet-Draft AGAP April 2010 7.2. Successful connection but unsuccessful authentication . . 63 7.3. Connection refused . . . . . . . . . . . . . . . . . . . . 63 7.4. Find what folders are available with messages . . . . . . 64 7.5. Retrieve a message . . . . . . . . . . . . . . . . . . . . 64 7.6. Retrieve a contact . . . . . . . . . . . . . . . . . . . . 64 7.7. Retrieve an event . . . . . . . . . . . . . . . . . . . . 65 7.8. Store a message . . . . . . . . . . . . . . . . . . . . . 67 7.9. Store a contact . . . . . . . . . . . . . . . . . . . . . 67 7.10. Store an event . . . . . . . . . . . . . . . . . . . . . . 68 7.11. Mark messages as SPAM an move them in a new folder . . . . 70 7.12. Create a filter folder, find the matching entries of the filter and read its filter definition . . . . . . . . 70 7.13. Create a folder and rename it . . . . . . . . . . . . . . 71 7.14. Find the status for a folder . . . . . . . . . . . . . . . 71 7.15. Set and check the tags of a message . . . . . . . . . . . 72 7.16. Find messages that can be SPAM and delete them . . . . . . 72 8. References . . . . . . . . . . . . . . . . . . . . . . . . 73 8.1. Normative References . . . . . . . . . . . . . . . . . . . 73 8.2. Informative References . . . . . . . . . . . . . . . . . . 73 Author's Address . . . . . . . . . . . . . . . . . . . . . 73 Radu Expires October 22, 2010 [Page 5] Internet-Draft AGAP April 2010 1. How to Read This Document 1.1. Organization of This Document This document is written from the point of view of someone implementing an AGAP client or server, and also from the point of view of a server administrator. The protocol overview (chapter 2) presents all aspects related to a correct implementation (like the maximum length of a command or response line, charset used). The material in chapter 3 through 5 provides the states in which can be a connection at a moment, respectively what commands are valid in each state and their valid responses. Chapter 6 makes a summary of the return codes for each command. The implementers find in chapter 7 samples of conversations so that they can test the compliance of their applications with this standard. 1.2. Conventions Used in This Document Document conventions are noted in this chapter. The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT","MAY", and "OPTIONAL" in this document are to be interpreted as described in 'Key words for use in RFCs to Indicate Requirement Levels' [RFC2119]. The word "CAN" (not "MAY") is used to refer to a possible circumstance or situation, as opposed to an optional facility of the protocol. "User" is used to refer to a human user. "Client" refers to the software being run by the user. "Server" refers to the software responding to the client requests. In examples, "C:" and "S:" indicate lines sent by the client and server respectively. "Connection" refers to the entire sequence of client/server interaction from the initial establishment of the network connection until its termination. "Conversation" is an exchange of commands and responses between the client and the server. "Account" defines all folders and their content that can be accessed from Authenticated State. All references to characters order is according to the UTF-8 [RFC3629] specification. 2. Protocol Overview 2.1. Charset Used for Commands and Responses All data exchanged between the server and the client is done using strings encoded UTF-8 [RFC3629]. If the server or client send a string incorrect encoded then the other side can close immediately the connection. Radu Expires October 22, 2010 [Page 6] Internet-Draft AGAP April 2010 2.2. Maximal Length of a Command or Response Line A command or response consists of a line of text that has a maximal length of 1024 characters (including line end). A line of text is ended with the character LF (0x0A). There can be optionally a CR character (0x0D) before the LF character. If the server or client sends a line with a length greater of 1024 then the other side can close immediately the connection. 2.3. Numbers in Commands and Responses The numbers that are used in commands are signed integers on 32 bits. The valid values are between -2,147,483,648 and 2,147,483,647. 2.4. Regular Expressions in Commands Following is a resume of all regular expression rules that CAN be used by the commands defined in this standard: Radu Expires October 22, 2010 [Page 7] Internet-Draft AGAP April 2010 Logical operators: XY X followed by Y X|Y Either X or Y Predefined character class: . Any character (does not match line terminators) Characters: x The character x \\ The backslash character \xhh The character with hexadecimal value 0xhh \uhhhh The character with hexadecimal value 0xhhhh \t The tab character ('\x09') \n The newline (line feed) character ('\x0A') \r The carriage-return character ('\x0D') Character classes: [abc] a, b, or c (simple class) [^abc] Any character except a, b, or c (negation) [a-zA-Z] a through z or A through Z, inclusive (range) Boundary matchers: ^ The beginning of a line $ The end of a line \b A word boundary \B A non-word boundary Greedy quantifiers: X? X, once or not at all X* X, zero or more times X+ X, one or more times X{n} X, exactly n times X{n,} X, at least n times X{n,m} X, at least n but not more than m times Reluctant quantifiers: X?? X, once or not at all X*? X, zero or more times X+? X, one or more times X{n}? X, exactly n times X{n,}? X, at least n times X{n,m}? X, at least n but not more than m times Figure 1 Radu Expires October 22, 2010 [Page 8] Internet-Draft AGAP April 2010 2.5. Unique Identification Numbers The length of an UID is between 1 and 32 characters. The UIDs MUST to be unique only between entries from the same folder. The characters accepted for building an UID are only all 26 Latin letters (A-Z) in lowercase and uppercase and all 10 Latin digits (0-9). An UID is case sensitive and it is valid only for the current connection (the same message/contact/event CAN have different UIDs for different client connections). Any new message/contact/event MUST to have a bigger UID as all other existing entries in the selected folder. The sorting is made according UTF-8 [RFC3629] (digits before letters and uppercase letters before the lowercase letters - 0..9A..Za..z). A short UID is before a longer one (9234 before 02345) and any zero (0) before a number is take into account by the server when two UIDs are compared. We get an approximately maximum number of 3.15e+85 unique combinations for 64 characters long UIDs. We get a maximum number of 136325893334400 unique combinations for 8 characters long UIDs . 2.6. Folders 2.6.1. Naming All folder names are case sensitive and they are encoded according to UTF-8 [RFC3629]. A backslash (\) does not escape the character after it (it has no special meaning). For building a folder name, the user CAN use all UTF-8 [RFC3629] characters with a value bigger then 0x1f (white space is the first allowed character), but with the exception of the slash (/ 9x2F) and back slash (\ 0x5C). The following folder names are not accepted: '.', and '..'. 2.6.2. Hierarchy None of the reserved folders can have subfolders, exception makes the TRASH that must to store also deleted folders and FILESHARE that holds ordinary files. The character used for delimiting path levels is the slash (/). A path that starts with '/' represents an absolute path. All other are Radu Expires October 22, 2010 [Page 9] Internet-Draft AGAP April 2010 relative to the currently selected folder (with SLCT). If there is no folder currently selected then the client MUST use only absolute paths. It is recommended for a client to use always absolute paths. 2.6.3. Folder Types The following folder types are defined by this standard: o calendar - CALE - holds events; o configuration - CONF - holds user accounts configuration (the client is free to store all information it needs for providing roaming); o contacts - ADDR - holds contact information; o files - FILE - holds files that have no special meanings for the server; o filter - FILT - holds the definition of a filter; o folder - FOLD - contains only subfolders; o journal - JRNL - holds journal entries; o message - MESG - holds e-mail messages; o notes - NOTE - holds short texts; o tasks - TODO - holds ToDo tasks. 2.6.4. Reserved Folders All the following reserved folders are located in the root of the user's account: o CALENDAR - CALE - holds the main calendar of the user; o CONFIGURATION - CONF - holds account configuration; o CONTACT - ADDR - holds the main contact list; o DRAFT - MESG - holds templates for e-mail messages; o FILESHARE - FILE - holds files accessible read-only by other users; Radu Expires October 22, 2010 [Page 10] Internet-Draft AGAP April 2010 o INBOX - MESG - holds all new e-mail messages; o JOURNAL - JRNL - holds the main journal; o JUNK - MESG - holds all e-mail messages marked as SPAM or VIRUSED by the server; o NOTE - NOTE - holds short texts; o OUTBOX - MESG - holds all e-mail messages that wait to be sent; o SENT - MESG - holds copy of sent e-mail messages; o TASK - TODO - holds the main tasks (Todo) list; o TRASH - MESG - holds all deleted e-mail messages; A client can use different names for these folders when display them so that the client application can use localization and standard or customized names for them. If this is the case, then the user cannot create a folder, in the root of his account, with the same name as the real (reserved) name of the folder. 2.7. Tags 2.7.1. Syntax The client can set tags only for folder entries, but the server can set tags also for folders. The tags of a folder are reported by the STAT command. The format of a tag is a name optionally followed by the equal sign (=) and a value. Each time is set a tag, the new value replace the old one. All tags that have no value assigned are returned as name only. Assigning an empty value to a tag makes it to return a name followed by the equal sign and no value. (This means that once a value is assigned to a tag, it will always be returned together with an equal sign.) Hint: Deleting and setting again (without a value) a tag that previously had a value will make it being returned without an equal sign. 2.7.2. Reserved Tag Names The following tag names have a meaning set by this standard: o ANSWERED - it was sent a reply to this e-mail message; Radu Expires October 22, 2010 [Page 11] Internet-Draft AGAP April 2010 o NO-FOLDERS - this entry cannot have subfolders; o READ-ONLY - this object can only be read; o RESERVED - it is a folder reserved by this standard; o SEEN - this object was already read; o SPAM - this e-mail message is marked as spam; 2.8. The Responses for Each Type of Folder 2.8.1. Format and Conventions All responses are in XML format. The tags and their attributes names are written only in lowercase. The content is encoded in UTF-8 [RFC3629] format. Each type of folder returns its entries in a different format. Each tag written in uppercase must to be send as it is, each tag written in lowercase will be replaced with the right value at the time of generation. Each tag that have a star will be present only if it is the case and without the star. If a command is correct but the server cannot execute it because of an internal error, then the server returns the code 401. 2.8.2. Response for Configuration Folders A response holding the configuration has the following structure: value Figure 2 Example: Radu Expires October 22, 2010 [Page 12] Internet-Draft AGAP April 2010 1024 Figure 3 2.8.3. Response for Contact Folders The format is the same as the one defined by the vCard XML Representation [I-D.ietf-vcarddav-vcardxml] standard (work in progress). Example: Iulian Radu Radu Iulian Dipl.-Ing. 1 1 de work Example Com work iulian.radu@gmx.at PUBLIC Figure 4 Radu Expires October 22, 2010 [Page 13] Internet-Draft AGAP April 2010 2.8.4. Response for Event (Calendar, Journal, Task) Folders The format is the same as the one defined by the xCal [I-D.daboo-et-al-icalendar-in-xml] standard (work in progress). The following example corresponds to this event definition: BEGIN:VCALENDAR VERSION:2.0 PRODID:-//amap/calender//NONSGML v1.0//EN BEGIN:VEVENT UID:uidx1234@example.com DTSTAMP:20100701T110000Z ORGANIZER;CN=RFC Amap:MAILTO:rfc@example.com DTSTART:20101102T000000Z DTEND:20101102T235959Z SUMMARY:AGAP RFC Party END:VEVENT END:VCALENDAR Figure 5 Example: Radu Expires October 22, 2010 [Page 14] Internet-Draft AGAP April 2010 -//amap/calender//NONSGML v1.0//EN 2.0 2010 7 1 11 0 0 2010 11 2 2010 11 2 AGAP RFC Party uidx1234@example.com Figure 6 Radu Expires October 22, 2010 [Page 15] Internet-Draft AGAP April 2010 2.8.5. Response for File Folders A response holding the content of a file has the following structure: content Figure 7 The valid encodings type are: utf-8, quoted-printable, and base64. It CAN be case-insensitive written. Example: c3VyZS4= Figure 8 2.8.6. Response for Filter Folders An entryTag can be: and, or, not, uid, tag, is, regex. The value associated to entryTag is specified as a XML text node. The is and regex tags have two attributes: path and op. Their values are set as for a filter command (see chapter "Syntax of a Filter" for more information). The first entryTag MUST to be an AND or OR tag. A response holding the content of a file has the following structure: ... Figure 9 Example: Radu Expires October 22, 2010 [Page 16] Internet-Draft AGAP April 2010 Viagra UIDx1234:UIDx4321 SPAM Figure 10 2.8.7. Response for Message Folders A response holding the content of a message has the following structure:
value... value n... ...
main text main html
...
... ...
Figure 11 A parent="0" for an attachment tag means that is it part of the main message or the parent is unknown. The value for parent is a number used as id for another attachment entry. An attachment having a wrong parent id will be considered to have no parent (parent="0"). It is incorrect for a tag to use the same number both for its id and its parent. Radu Expires October 22, 2010 [Page 17] Internet-Draft AGAP April 2010 The first index and the first attachment id has the value 1. The index of on item tag shows the order of the entries in the original message. The default content type for an attachment is "text/plain", the default content encoding is utf-8, and the default parent id is 0. The entries in the header of the main message and attachments are the same with the one from the e-mail message. Example: Radu Expires October 22, 2010 [Page 18] Internet-Draft AGAP April 2010
example@no-spam.com example@example.com from mail.yahoo.com by example.com; Tue, 16 Mar 2010 12:14:24 +0100 from no-spam.com by mail.yahoo.com; Mon, 15 Mar 2010 11:13:23 +0100 multipart/mixed; boundary="XYZ" A basic example
Please see the attachments. <b>Please</b> see the <u>attachments</u>.
multipart/related
text/plain
See the picture.
image/jpeg base64
c3VyZS4=
Figure 12 The previous example corresponds to a message with the following structure: o multipart/mixed Radu Expires October 22, 2010 [Page 19] Internet-Draft AGAP April 2010 * multipart/alternative + text/plain + text/html * multipart/related + text/plain + image/jpeg 2.8.8. Response for Note Folders A response holding the content of the note has the following structure: content Figure 13 Example: To review the code. Figure 14 3. States 3.1. Non-authenticated State This is the default state when a new connection is made to the server. The client becomes a welcome message. From this state the client can use the command 'AUTH mechanism' to move in the 'Pre-authentication State'. This is the only other state in which the server can go. The client can use the command 'STLS' for commuting in the encrypted mode of the channel. After STLS the server remains in the 'Non- authenticated State'. There is no command for switching back to Radu Expires October 22, 2010 [Page 20] Internet-Draft AGAP April 2010 clear-text communication. The client can use the command 'SGZP' for commuting in the compressed mode of the channel. After SGZP the server remains in the 'Non- authenticated State'. There is no command for switching back to not- compressed communication. A client can use at the same time the both modes (encrypted and compressed). The client can use the command 'QUIT' for terminating the connection. For finding what extensions are installed in server, the client can use the 'CAPA' command. 3.2. Pre-authentication State This is the state where a client authenticate itself and move to the 'Authenticated State' or returns to the 'Non-authenticated State'. This standard defines only one method for AUTH: PLAIN. Following is a description of the commands flow used by this authentication mechanism. The client must send a 'USER account' followed by a 'PASS password' (if the server confirms the acceptance of the account name). If the pair account and password is accepted then the server move to the state 'Authenticated State' and the folder INBOX is selected by server. If this folder does not exist then the client remains in the 'Authenticated State' but the client must to select an existing folder for operating with this account. If this pair is rejected then the server returns to the 'Non-authenticated State'. That means that the client must to send a new 'AUTH mechanism' for trying a new authentication. The client can use the command 'QUIT' for terminating the connection. A client can enter into this state only after a successful 'AUTH' command in 'Non-authenticated State'. 3.3. Authenticated (and Selected) State This is the state from which a client operates with the content of an account. From this state the client can use the command 'EXIT' to move in the 'Non-authenticated State'. After an unsuccessful SLCT, the server goes in 'Not-selected State'. Radu Expires October 22, 2010 [Page 21] Internet-Draft AGAP April 2010 The client can use the command 'QUIT' for terminating the connection. Check the following chapter for finding which commands can be performed from this state. A client can enter into this state only after a successful authentication in the 'Pre-authenticated State' or after a successful 'SLCT' command in the 'Authenticated State' or 'Not-selected State'. 3.4. (Authenticated but) Not-selected State This is the state from which a client must to select a folder for performing further operations. From this state the client must use the command 'SLCT' to select a folder and to move in the 'Authenticated State'. This is the only other state in which the server can go. The client CAN use the command 'LIST' for finding valid folder names that eventually CAN be selected with 'SLCT' command. The client CAN use the command 'QUIT' for terminating the connection. A client CAN enter into this state only after an unsuccessful 'SLCT' command or if the INBOX folder does not exists and it cannot be selected automatically after a successful authentication. 4. Commands 4.1. Semantic and Syntax Each command has its name from 4 letters and it is matched case- insensitive. Each command is separated by its arguments by a 0x20 character. Also, each argument is separated from its adjacent arguments by a 0x20 character. The minimal response has only the return code without any text. A list of elements is enclosed between parentheses (round brackets). 4.2. Syntax of a Tag List A tag list is used by the following commands: FTAG, GTAG and STAG. A tag list defines what action to be done with its tags. Radu Expires October 22, 2010 [Page 22] Internet-Draft AGAP April 2010 Syntax: ACTION TAG TAG ... ACTION: o = - set only these tags; o + - add this tags o - - delete these tags. Example: C: STAG UIDx1234 = SEEN SPAM C: STAG UIDx1234 + SEEN SPAM C: STAG UIDx1234 - SEEN SPAM Figure 15 4.3. Syntax of a Filter 4.3.1. Syntax of a Filter for a Command A filter of this type is used by the following commands: FCPY, FDEL, FTAG, FIND and FMOV. A filter defines rules for matching the different messages. It is defined as lines with rules and it is ended by an empty line. The keywords of the filter are case insensitive matched (ex.: UID and Uid are the same). Accepted rules: o ( ) - grouping for AND and OR; o AND - the implicit rule; o OR - all following rules are with OR bonded (until the end of the current group); o NOT - invert the result of the following rule; o UID uid - one UID; o UID uid_begin_range:uid_end_range - inclusive range; Radu Expires October 22, 2010 [Page 23] Internet-Draft AGAP April 2010 o TAG tag_name - a tag; o TAG tag_name=tag_value - a tag with a value; o IS field_path op string - a field from the content (as XML) with an exact matched text (string is written between " or '); op can be: <, <=, =, !=, >=, >; o REGEX field_path op regex_string - a field from the content (as XML) with a regular expression matched text (regex_string is written between " or '); op can be: =, !=. The filed_path is a XPATH in the response as it is returned by RETR. Searching for a TAG without associating and a value to it will match all entries that have this tag even if it have values set for it. Example 1: These filters find all messages with the UID between UIDx0001:UIDx1000 and that were seen and marked as being spam or having a virus (the AND is redundant in the second case). Both filter definitions are equivalent. C: UID UIDx0001:UIDx1000 OR ( TAG SPAM TAG HAS=VIRUS ) TAG SEEN C: UID UIDx0001:UIDx1000 AND( OR ( TAG SPAM TAG HAS=VIRUS ) TAG SEEN) Figure 16 Example 2: C: IS header/subject = "From University" C: REGEX header/from != "[^0-9]+@example\.com$" C: IS vcard/fn/text = "Anonymous" C: REGEX vcard/org/text = "^[A-Za-z]+[0-9]$" Figure 17 4.3.2. Syntax of a Filter for a FILT Folder A filter of this type is used by the following command: STOR. A filter defines rules for matching the different messages from different folders. It is defined as a XML with target folders and rules. The keywords of the filter are case sensitive matched (ex.: UID and Uid are not the same). They are always lowercase. Radu Expires October 22, 2010 [Page 24] Internet-Draft AGAP April 2010 Accepted rules: o AND - all its entries must be matched; o OR - at least one of its entries must be matched; o NOT - invert the result of its child rule; o UID uid - one UID; o UID uid_begin_range:uid_end_range - inclusive range; o TAG tag_name - a tag; o TAG tag_name=tag_value - a tag with a value; o IS path op string - a field from the content (as XML) with an exact matched text (string is written between " or '); op can be: <, <=, =, !=, >=, >; o REGEX path op regex_string - a field from the content (as XML) with a regular expression matched text (regex_string is written between " or '); op can be: =, !=. The filed_path is a XPATH in the response as is it returned by RETR. Searching for a TAG without associating and a value to it will match all entries that have this tag even if it have values set for it (the empty string is also considered matched). The following two examples corresponds to the two examples from the previous chapter: Radu Expires October 22, 2010 [Page 25] Internet-Draft AGAP April 2010 /INBOX UIDx0001:UIDx0010 SPAM HAS=VIRUS SEEN Figure 18 Example 2: /INBOX From University [^0-9]+@example\.com$ Anonymous ^[A-Za-z]+[0-9]$ Figure 19 4.4. The Welcome Message - not-authenticated state Results: 200 401 410 531 Result 200 - the client is accepted for sending commands; Result 401 - there was an internal error; Result 410 - too many connections; Result 531 - the client is rejected permanently. Radu Expires October 22, 2010 [Page 26] Internet-Draft AGAP April 2010 Description: When a client connects to the server it receives a welcome message. This message begins with a response code that shows if the client is accepted for sending commands. Examples: S: 200 Welcome localhost [127.0.0.1] Figure 20 S: 401 Internal error, please contact our administrator Figure 21 S: 410 Sorry, too many connections, please retry later Figure 22 S: 531 Your hostname/IP (localhost:127.0.0.1) is blacklisted Figure 23 4.5. Command QUIT - all states Name: quit Arguments: none Result: 200 Description: The QUIT command close the connection between the client and server. Example: C: QUIT S: 200 OK Bye Figure 24 Radu Expires October 22, 2010 [Page 27] Internet-Draft AGAP April 2010 4.6. Command AUTH mechanism - not-authenticated state Name: authenticate Argument: mechanism Results: 200 510 511 Result 200 - the mechanism is known and accepted. Result 510 - unknown command. Result 511 - the mechanism is unknown/unsupported. Description: Choose an authentication method (exists at least the mechanism PLAIN). Examples: C: AUTH PLAIN S: 200 OK Send USER Figure 25 C: AUTH S: 510 UNKNOWN command Figure 26 C: AUTH unknown S: 511 UNKNWON method Figure 27 4.7. Command CAPA - not-authenticated state Name: capabilities Arguments: none Result: 200 Description: Ask for the extensions known by the server. Note: If the server accepts compression then it must advertise the Radu Expires October 22, 2010 [Page 28] Internet-Draft AGAP April 2010 GZIP capability. If the server can encrypt the communication channel then it must advertise the TLS capability. (The following example shows both capabilities advertised.) Example: C: CAPA S: .GZIP S: .TLS S: .Extension1 S: .Extension.2 argument1 S: .Extension-3 argument1 argument2 S: 200 OK CAPA completed Figure 28 4.8. Command SGZP - not-authenticated state Name: start using GZip Arguments: none Results: 200 510 Result 200 - the communication is now compressed. Result 510 - unknown/unsupported command. Description: Change the communication in compressed mode using GZIP [RFC1952] as compression method. If this command is executed from the compression mode then it simply returns a 200 response code. The response to this command is using still the not-compressed mode of the channel. The compression becomes effective only after a 200 response line was send by the server. Note: With GZIP the data is compressed using the LZ77 algorithm and Huffman coding. Starting using this mode is like starting to write clear texts into a GZIP format archive and reading texts from a GZIP format archive. The compression is used both by the client and the server and they start to use it with the next line they send after the 200 response line received from the server. Examples: Radu Expires October 22, 2010 [Page 29] Internet-Draft AGAP April 2010 C: SGZP S: 200 OK Using GZIP Figure 29 C: SGZP S: 510 UNKNOWN command Figure 30 4.9. Command STLS - not-authenticated state Name: start using TLS Arguments: none Results: 200 510 Result 200 - the communication is now encrypted. Result 510 - unknown/unsupported command. Description: Change the communication in mode TLS. If this command is executed from the encrypted mode then it simply returns a 200 response code. The response to this command is using still the not- encrypted mode of the channel. The encryption becomes effective only after a 200 response line was send by the server. Examples: C: STLS S: 200 OK Using TLS Figure 31 C: STLS S: 510 UNKNOWN command Figure 32 4.10. Command PASS password - pre-authenticated state (PLAIN) Name: password Argument: password Radu Expires October 22, 2010 [Page 30] Internet-Draft AGAP April 2010 Result: 200 510 511 512 Result 200 - the pair user/password was successfully authenticated. Result 510 - unknown/unsupported command. Result 511 - invalid password. Result 512 - first send USER and then PASS. Description: Send the password associated to the previous USER. Examples: C: USER account S: 200 OK Send PASS C: PASS password S: 200 OK Authenticated Figure 33 C: USER account S: 200 OK Send PASS C: PASS S: 510 UNKNOWN command Figure 34 C: USER account S: 200 OK Send PASS C: PASS password S: 511 WRONG user/password pair Figure 35 Radu Expires October 22, 2010 [Page 31] Internet-Draft AGAP April 2010 C: AUTH PLAIN S: 200 OK AUTH completed C: PASS password S: 512 EXPECTED USER Figure 36 4.11. Command USER account - pre-authenticated state (PLAIN) Name: user Argument: account Result: 200 Result: 200 510 511 Result 200 - the user is accepted and expecting the password. Result 510 - unknown/unsupported command. Result 511 - invalid account. Description: Send an account name for authentication and authorization. Examples: C: AUTH PLAIN S: 200 OK Send USER C: USER account S: 200 OK Send PASS Figure 37 C: AUTH PLAIN S: 200 OK Send USER C: USER S: 510 UNKNOWN command Figure 38 Radu Expires October 22, 2010 [Page 32] Internet-Draft AGAP April 2010 C: AUTH PLAIN S: 200 OK Send USER C: USER account S: 511 INVALID username Figure 39 4.12. Command COPY - authenticated state Name: copy entry Arguments: UID_source path_destination_folder Result: 200 510 511 Result 200 - the copy was successful. Result 510 - unknown/unsupported command. Result 511 - unknown uid or invalid destination folder. Description: Copy a message/contact/event from the currently selected folder into another folder (by UID). Note: For copying a folder the client must use CPYF. Examples: C: COPY UIDx1234 ARCHIVE_FOLDER/TODAY S: 200 OK COPY completed Figure 40 C: COPY S: 510 UNKNOWN command Figure 41 Radu Expires October 22, 2010 [Page 33] Internet-Draft AGAP April 2010 C: COPY UIDx1234 ARCHIVE_FOLDER/TODAY S: 511 INVALID UID C: COPY MSGx1234 ARCHIVE_FOLDER/1970 S: 511 INVALID Destination Figure 42 4.13. Command CPYF - authenticated state Name: copy folder Arguments: path_source_folder path_destination_folder Result: 200 510 511 Result 200 - the copy was successful. Result 510 - unknown/unsupported command. Result 511 - invalid source or destination folder. Description: Copy the content of a folder into another folder. Note: In the destination folder are created copies of all entries found in the source. If the user needs to copy the content of the source folder in another folder then he must to create first a new folder with the MAKE command and then use it as argument for CPYF. Examples (in TODAY are copied only the messages from INBOX): C: CPYF INBOX ARCHIVE_FOLDER/TODAY S: 200 OK CPYF completed Figure 43 C: CPYF S: 510 UNKNOWN command Figure 44 Radu Expires October 22, 2010 [Page 34] Internet-Draft AGAP April 2010 C: CPYF MISSING ARCHIVE_FOLDER/TODAY S: 511 INVALID Source C: CPYF INBOX MISSING S: 511 INVALID Destination Figure 45 4.14. Command DATT - authenticated state (MESG folder type) Name: delete attachment Arguments: UID AttNum Result: 200 510 511 521 Result 200 - the attachment was successfully deleted. Result 510 - unknown/unsupported command. Result 511 - unknown uid or uid is not for a message. Result 521 - wrong attachment number. Description: Delete from a message an attachment. The first attachment has number 1. All its children are also deleted. Note: It cannot be undone. Examples: C: DATT UIDx1234 1 S: 200 OK Attachment deleted Figure 46 C: DATT S: 510 UNKNOWN command Figure 47 Radu Expires October 22, 2010 [Page 35] Internet-Draft AGAP April 2010 C: DATT UIDx1234 1 S: 511 INVALID UID C: DATT UIDx1234 -1 S: 511 INVALID Attachment number Figure 48 C: DATT UIDx1234 10 S: 521 There are not so many attachments Figure 49 4.15. Command DELE - authenticated state Name: delete entry Argument: UID Result: 200 510 511 Result 200 - the entry was successfully deleted. Result 510 - unknown/unsupported command. Result 511 - unknown uid. Description: Delete a message/contact/event by uid. Note: It cannot be undone. Examples: C: DELE UIDx1234 S: 200 OK Message deleted Figure 50 C: DELE S: 510 UNKNOWN command Figure 51 Radu Expires October 22, 2010 [Page 36] Internet-Draft AGAP April 2010 C: DELE 1234 S: 511 INVALID UID Figure 52 4.16. Command DELF - authenticated state Name: delete folder Argument: path_folder Result: 200 510 511 Result 200 - the folder was successfully deleted. Result 510 - unknown/unsupported command. Result 511 - unknown path or the path points to a reserved folder. Description: Delete a folder and all its content and subfolders. A reserved folder cannot be deleted. Note: It cannot be undone. Examples: C: DELF ARCHIVE/TODAY S: 200 OK Folder deleted Figure 53 C: DELF S: 510 UNKNOWN command Figure 54 Radu Expires October 22, 2010 [Page 37] Internet-Draft AGAP April 2010 C: DELF MISSING S: 511 INVALID Folder C: DELF INBOX S: 511 INBOX cannot be deleted Figure 55 4.17. Command EXIT - authenticated state Name: exit Arguments: none Result: 200 Description: Return the server to the Non-authenticated State. Example: C: EXIT S: 200 OK EXIT completed Figure 56 4.18. Command FCPY - authenticated state Name: find and copy entries Arguments: path_destination_folder filter* Result: 200 510 511 Result 200 - the find and copy was successful. Result 510 - unknown/unsupported command. Result 511 - invalid destination folder or wrong filter. Description: Search for messages/contacts/events only from the currently selected folder (no subfolders) that correspond to a filter and copy them to a new folder. The tags are also copied. Note: The filter is delivered after the acceptance of the command (response code 100). Examples: Radu Expires October 22, 2010 [Page 38] Internet-Draft AGAP April 2010 C: FCPY ARCHIVE/SPAM S: 100 OK SEND filter definition (end it with an empty line) C: UID 00000001:00001000 AND TAG SPAM C: S: 200 OK FCPY completed (10 matches) Figure 57 C: FCPY S: 510 UNKNOWN command Figure 58 C: FCPY MISSING S: 511 INVALID folder C: FCPY SEND S: 100 OK SEND filter definition (end it with an empty line) C: LATER C: S: 511 INVALID filter definition Figure 59 4.19. Command FDEL - authenticated state Name: find and delete entries Argument: filter* Result: 200 511 Result 200 - the find and delete was successful. Result 511 - wrong filter (inclusive empty filter). Description: Search for messages/contacts/events only from the currently selected folder (no subfolders) that correspond to a filter and delete them (no copy in TRASH). Note: The filter is delivered after the acceptance of the command (response code 100). Examples: Radu Expires October 22, 2010 [Page 39] Internet-Draft AGAP April 2010 C: FDEL S: 100 OK SEND filter definition (end it with an empty line) C: UID 00000001:00001000 AND TAG SPAM C: S: 200 OK FDEL completed (10 matches) Figure 60 C: FDEL S: 100 OK SEND filter definition (end it with an empty line) C: LATER C: S: 511 INVALID filter definition Figure 61 4.20. Command FIND - authenticated state Name: find entry Argument: filter* Result: 200 511 Result 200 - the find was successful. Result 511 - wrong filter. Description: Search for messages/contacts/events only from the currently selected folder (no subfolders) that correspond to a filter and return their UIDs. If the search is done for a filter folder then the server does not expect any filter and apply the current filter (if any). If there is no filter in the filter folder then it is returned only the return code. The answer consists of the UIDs and, for a filter folder, they are followed by a 0x20 character and the absolute path for which are the corresponding UID. Note: For not FILT folders, the filter is delivered after the acceptance of the command. An empty filter matches all messages/ contacts/events from that folder. Examples: Radu Expires October 22, 2010 [Page 40] Internet-Draft AGAP April 2010 C: SLCT /MESG-Folder C: FIND S: 100 OK SEND filter definition (end it with an empty line) C: UID UIDx0001:UIDx9000 TAG SPAM C: S: .UIDx1234 S: .UIDx1235 S: .UIDx2340 S: 200 OK FIND completed (3 matches) C: SLCT /FILT-Folder C: FIND S: .UIDx1234 /INBOX S: .UIDx1234 /Trash S: .UIDx1235 /Trash S: 200 OK FIND completed (3 matches) Figure 62 C: FIND S: 100 OK SEND filter definition (end it with an empty line) C: LATER C: S: 511 INVALID filter definition Figure 63 4.21. Command FMOV - authenticated state Name: find and move Arguments: path_destination_folder filter* Result: 200 510 511 Result 200 - the find and move was successful. Result 510 - unknown/unsupported command. Result 511 - invalid destination folder or wrong filter. Description: Search for messages/contacts/events only from the currently selected folder (no subfolders) that correspond to a filter and move them to a new folder. The tags are also moved. Note: The filter is delivered after the acceptance of the command (response code 100). Radu Expires October 22, 2010 [Page 41] Internet-Draft AGAP April 2010 Examples: C: FMOV ARCHIVE/SPAM S: 100 OK SEND filter definition (end it with an empty line) C: UID 00000001:00001000 AND TAG SPAM C: S: 200 OK FMOV completed (10 matches) Figure 64 C: FMOV S: 510 UNKNOWN command Figure 65 C: FMOV MISSING S: 511 INVALID folder C: FMOV SEND S: 100 OK SEND filter definition (end it with an empty line) C: LATER C: S: 511 INVALID filter definition Figure 66 4.22. Command FTAG - authenticated state Name: find and tag entries Arguments: tag_list filter* Result: 200 510 511 Result 200 - the find and set of tag(s) were successful. Result 510 - unknown/unsupported command. Result 511 - invalid tag list or wrong filter. Description: Search for messages/contacts/events only from the currently selected folder (no subfolders) that correspond to a filter and change their tags. Note: The filter is delivered after the acceptance of the command (response code 100). Radu Expires October 22, 2010 [Page 42] Internet-Draft AGAP April 2010 Examples: C: FTAG + SEEN S: 100 OK SEND filter definition (end it with an empty line) C: UID 00000001:00001000 AND TAG NEW C: S: 200 OK FTAG completed (10 matches) Figure 67 C: FTAG S: 510 UNKNOWN command Figure 68 C: FTAG SEEN S: 511 INVALID tag list C: FTAG + SEEN S: 100 OK SEND filter definition (end it with an empty line) C: LATER C: S: 511 INVALID filter definition Figure 69 4.23. Command GTAG - authenticated state Name: get tag Arguments: UID_range Result: 200 510 511 Result 200 - the tag(s) of UIDs was/were successful displayed. Result 510 - unknown/unsupported command. Result 511 - invalid UID or UID range. Description: Return the tags associated to one or more messages/ contacts/events (by UID). Examples: Radu Expires October 22, 2010 [Page 43] Internet-Draft AGAP April 2010 C: GTAG UIDx1000 S: .UIDx1000 SEEN SPAM S: 200 OK GTAG completed C: GTAG UIDx1000:UIDx1234 S: .UIDx1000 SEEN SPAM S: .UIDx1100 S: .UIDx1200 NEW S: 200 OK GTAG completed Figure 70 C: GTAG S: 510 UNKNOWN command Figure 71 C: GTAG -1 S: 511 INVALID UID C: GTAG UIDx1234:UIDx1000 S: 511 INVALID UID range Figure 72 4.24. Command LIST - authenticated and not-selected state Name: list Arguments: path/filter? Results: 200 511 513 Result 200 - the list was successful delivered (even if it is empty). Result 511 - filter is invalid. Result 521 - the specified path (that has no wildcard) does not exist or the filter returns no results. Description: List all folders that correspond to the filter (if it is provided), otherwise all direct children of this folder together with their types. All returned folder names are prefixed with the type of the corresponding folder (as it is used by the MAKE command) followed by a white space and the path to the folder (absolute or relative). Filter: It is a relative (does not begins with /) or an absolute (begins with /) path. The slash sign (/) is used to delimit folders Radu Expires October 22, 2010 [Page 44] Internet-Draft AGAP April 2010 in the hierarchy. There can be only a star (*) and must to be located in the name of the last folder. The '\' does not have any meaning and it is interpreted as a normal character. The server can return 511 if it founds '.' or '..' as folder names in the filter definition, and it must not escape (or give a special meaning) to the character found after a backslash. In addition, the server cannot return relative paths using at beginning of a path the string './'. Examples: C: LIST S: .MESG YESTERDAY S: .MESG YEAR-2000 S: 200 OK LIST completed (2 matches) C: LIST /* S: .MESG /INBOX S: .MESG /TRASH S: .CALE /CALENDAR S: 200 OK LIST completed (3 matches) C: LIST YEAR-2010/J* S: .MESG /WORK/YEAR-2010/JUN S: .MESG /WORK/YEAR-2010/JUL S: 200 OK LIST completed (2 matches) Figure 73 C: LIST */* S: 511 ERROR path filter can contain only one * in last folder name Figure 74 C: LIST /ARCHIVE/2000 S: 521 ERROR The specified folder does not exist C: LIST /archive* S: 521 ERROR No matching folders found (0 matches) Figure 75 4.25. Command MAKE - authenticated state Name: make folder Argument: type path Result: 200 510 511 Radu Expires October 22, 2010 [Page 45] Internet-Draft AGAP April 2010 Result 200 - the folder was successfully created. Result 510 - unknown/unsupported command. Result 511 - invalid path, unknown/unsupported type or the parent of the new folder does not accept to have subfolders. Description: Create a folder of a certain type. Types: They are case insensitive o ADDR - it holds contacts; o CALE - it holds calendar events; o CONF - it holds user's settings for roaming. o FILE - it holds normal folders and files; o FILT - it holds the results of a filter defined by the user (there can be only one filter per folder); o FOLD - it contains only subfolders; o JRNL - it holds a journal; o NOTE - it holds user's notes; o MESG - it holds messages; o TODO - it holds todo tasks; Note: If it requires parents that does not exist then the server will not create them for the client but it will return a 511 response code. Examples: C: MAKE MESG /ARCHIVE/2010 S: 200 OK Folder created Figure 76 Radu Expires October 22, 2010 [Page 46] Internet-Draft AGAP April 2010 C: MAKE S: 510 UNKNOWN command Figure 77 C: MAKE 1234 S: 511 ERROR Missing folder name C: MAKE new 1234 S: 511 ERROR Unknown folder type C: MAKE MESG /INBOX/1234 S: 511 ERROR The parent folder does not accept subfolders. Figure 78 4.26. Command MOVE - authenticated state Name: move entry Arguments: UID_source path_destination_folder Result: 200 510 511 Result 200 - the move was successful. Result 510 - unknown/unsupported command. Result 511 - unknown uid or invalid destination folder. Description: Move a message/contact/event into another folder (by UID). Note: For moving a folder the client must use MOVF. Examples: C: MOVE UIDx1234 ARCHIVE_FOLDER/TODAY S: 200 OK MOVE completed Figure 79 Radu Expires October 22, 2010 [Page 47] Internet-Draft AGAP April 2010 C: MOVE S: 510 UNKNOWN command Figure 80 C: MOVE UIDx1234 ARCHIVE_FOLDER/TODAY S: 511 INVALID UID C: MOVE MSGx1234 ARCHIVE_FOLDER/1970 S: 511 INVALID Destination Figure 81 4.27. Command MOVF - authenticated state Name: move folder Arguments: path_source_folder path_destination_folder Result: 200 510 511 Result 200 - the move was successful. Result 510 - unknown/unsupported command. Result 511 - invalid source or destination folder. Description: Move the content of a folder into another folder. Note: In the destination folder are moved all entries found in the source without the folders. If the user needs to move the content of the source folder in another folder then he must to create first this new folder with the MAKE command and then use it as argument for MOVF. Examples: C: MOVF INBOX ARCHIVE_FOLDER/TODAY S: 200 OK MOVF completed Figure 82 Radu Expires October 22, 2010 [Page 48] Internet-Draft AGAP April 2010 C: MOVF S: 510 UNKNOWN command Figure 83 C: MOVF MISSING ARCHIVE_FOLDER/TODAY S: 511 INVALID Source C: MOVF INBOX MISSING S: 511 INVALID Destination Figure 84 4.28. Command NAME - authenticated state Name: rename folder Arguments: path new_name Results: 200 510 511 Result 200 - the rename was successful. Result 510 - unknown/unsupported command. Result 511 - invalid path, new_name or trying to rename a reserved folder name. Description: Rename a folder. Note: The new_name does not hold any path hierarchy. Examples: C: NAME ARCHIVE/2001 OLD-2001 S: 200 OK NAME completed Figure 85 Radu Expires October 22, 2010 [Page 49] Internet-Draft AGAP April 2010 C: NAME S: 510 UNKNOWN command Figure 86 C: NAME /INBOX S: 511 ERROR Missing the new name C: NAME MissingFolder NewName S: 511 ERROR Folder to be renamed was not found C: NAME /INBOX InBox S: 511 ERROR The folder cannot be renamed C: NAME /A/Folder /A/new-folder S: 511 ERROR The second argument must not be a path Figure 87 4.29. Command NOOP - authenticated state Name: noop Arguments: none Result: 200 Description: It does nothing (eventually announce what changes was done in current folder). Example: C: NOOP S: 200 OK NOOP completed Figure 88 4.30. Command RETR - authenticated state Name: retrieve Arguments for a FILT folder: none Arguments for other types: UID part? Results: 200 510 511 Result 200 - the message/contact/event was found or filter content was delivered. Radu Expires October 22, 2010 [Page 50] Internet-Draft AGAP April 2010 Result 510 - unknown/unsupported command. Result 511 - invalid UID or part name. Description: Fetch from server the message/contact/event with the given UID. For a filter folder, it must be called without arguments and it returns the content of the filter. Each line of answer is prefixed with a dot that it is not part of the returned object. Part: It is a XPATH in the response as it is returned by RETR. Examples: C: RETR UIDx1234 S: .
...
...
S: 200 OK RETR completed C: RETR UIDx1234 header/subject S: .
S: .Message's subject S: .
S: 200 OK RETR completed C: RETR S: . S: ./Spam S: . S: . S: 200 OK RETR completed Figure 89 C: RETR S: 510 UNKNOWN command (only FILT folders do not needs arguments) Figure 90 Radu Expires October 22, 2010 [Page 51] Internet-Draft AGAP April 2010 C: RETR WrongUID S: 511 INVALID UID C: RETR UIDx1234 ABC S: 511 UNKNOWN part name C: RETR UIDx1234 S: 511 RETR with UID is not allowed for a FILT folder Figure 91 4.31. Command SLCT - authenticated and not-selected state Name: select a folder Argument: path Result: 200 510 511 Result 200 - the folder was successfully selected. Result 510 - unknown/unsupported command. Result 511 - unknown path. Description: Select a folder. If the selection was not successful then no folder remains selected and the server switch in the 'Not- selected State'. Examples: C: SLCT /INBOX S: 200 OK Folder selected C: SLCT ARCHIVE/2000 S: 200 OK Folder selected Figure 92 C: SLCT S: 510 UNKNOWN command Figure 93 Radu Expires October 22, 2010 [Page 52] Internet-Draft AGAP April 2010 C: SLCT 1234 S: 511 INVALID folder Figure 94 4.32. Command SPAM - authenticated state (MESG folder type) Name: spam Argument: UID reason? Result: 200 510 511 Result 200 - the entry was successfully marked. Result 510 - unknown/unsupported command. Result 511 - invalid or not found UID, or invalid reason. Description: Mark a message as SPAM/MALWARE. The server can ignore this command or it can check the reason (if present) and improve its SPAM detection mechanism. Reason: It can be the name of a field (ex.: header/subject) eventually followed by equal and the text from that field that identify it as a SPAM. If there is more than one criterion for marking a message as SPAM then the client must supply for each reason a SPAM command. If there is no reason then the whole indicated field's content is used. Note: It cannot be undone and no tag is set for this message. Examples: C: SPAM UIDx1234 S: 200 OK Message added to the spam database C: SPAM UIDx1234 header/subject S: 200 OK Message added to the spam database C: SPAM UIDx1234 body=V1AGRA S: 200 OK Message added to the spam database Figure 95 Radu Expires October 22, 2010 [Page 53] Internet-Draft AGAP April 2010 C: SPAM S: 510 UNKNOWN command Figure 96 C: SPAM 1234 S: 511 INVALID UID Figure 97 4.33. Command STAG - authenticated state Name: set tags of entries Arguments: UID_range tag_list Result: 200 510 511 Result 200 - the tag(s) for UIDs were successful set. Result 510 - unknown/unsupported command. Result 511 - invalid UID or UID range. Description: Set or delete tags associated to one or more messages/ contacts/events (by UID). Examples: C: STAG UIDx1000 + SEEN S: 200 OK STAG completed C: STAG UIDx1000:UIDx1234 + SEEN S: 200 OK STAG completed Figure 98 C: STAG S: 510 UNKNOWN command Figure 99 Radu Expires October 22, 2010 [Page 54] Internet-Draft AGAP April 2010 C: STAG -1 S: 511 INVALID UID C: STAG -1 + SEEN S: 511 INVALID UID C: STAG UIDx1234 SEEN S: 511 INVALID tag list Figure 100 4.34. Command STAT - authenticated state Name: status Arguments: none Result: 200 512 Result 200 - the status of the folder was successfully delivered. Result 512 - no folder is selected. Description: Return the absolute path of the currently selected folder (PATH), its type (TYPE), the tags (TAGS) and eventually additional information associated with this type of folder. Additional information: o ADDR - none; o CALE - none; o CONF - none. o FILE - TOTAL; o FILT - TOTAL and NEW; o FOLD - none; o JRNL - none; o MESG - TOTAL and NEW; o NOTE - TOTAL; o TODO - TOTAL; Examples: Radu Expires October 22, 2010 [Page 55] Internet-Draft AGAP April 2010 C: STAT S: .PATH /INBOX S: .TYPE MSG S: .TAGS RESERVED S: .TOTAL 10 S: .NEW 2 S: 200 OK Folder status displayed Figure 101 C: STAT S: 512 ERROR First select a folder Figure 102 4.35. Command STOR - authenticated state Name: store Arguments: none Result: 200 410 511 Result 200 - the entry was successfully deleted. Result 410 - if the item cannot be stored. Result 511 - if the data is not a valid XML or its schema does not correspond to the type of the destination folder. Description: Store a new message/contact/event/filter into a folder. If it is written a new filter into a FILT folder, then the previous filter is deleted. If the new filter has an invalid XML structure or cannot be saved then the folder remains with the old filter (if any). Note: Do not send a message content using CDATA as it can hold empty lines and an empty line means for the server the end of the message to be stored. Examples: Radu Expires October 22, 2010 [Page 56] Internet-Draft AGAP April 2010 C: STOR S: 110 Send the message ended with an empty line C:
...
...
C: S: 200 OK Message stored (UID is UIDx1234) Figure 103 C: STOR S: 110 Send the message ended with an empty line C:
...
...
C: S: 410 Cannot store it, not enough space Figure 104 C: STOR S: 110 Send the message ended with an empty line C: msg C: S: 511 Cannot store it, the message has an incorrect format Figure 105 5. Responses 5.1. Semantic and Syntax The Response-Code element is a 3-digit integer result code of the attempt to understand and satisfy the request. These codes are fully defined in the following section. After the Response-Code, can follow a 0x20 character and then a Reason-Phrase intended to give a short textual description of the returned code. The Response-Code is intended for automatic use. The Reason-Phrase is intended for humane persons that debug the connection. The first digit of the Response-Code defines the class of response. The last two digits do not have any categorization role. There are 4 values for the first digit: o 1xx: Informational - Server waits for request continuation or send unrequested data; Radu Expires October 22, 2010 [Page 57] Internet-Draft AGAP April 2010 o 2xx: Success - The action was successfully executed; o 4xx: Server Error - The server failed to perform the request, retry later; o 5xx: Server Error - The server failed to perform the request, permanent error; There are commands that return a multi-line response. These are: CAPA, FIND, GTAG, LIST, RETR, and STAT. In this cases, the response code is at the beginning of the last line of the response. All other lines start with a dot (.). 5.2. 1xx Informational 5.2.1. 100 Reserved Reserved. 5.2.2. 110 Continue The client SHOULD continue sending the rest of this request. This response informs the client that the server accepted the initial part of the request and it is waiting for the next part of the request. The server sends a final response after the request has been completely received and processed. 5.3. 2xx Success 5.3.1. 200 OK The request was successfully processed. 5.4. 4xx Temporary Server Error 5.4.1. 400 Reserved Reserved. 5.4.2. 401 Internal Error The request could not be processed because it was an internal error (ex.: something is wrong configured). 5.4.3. 410 Retry later The operation must to be retried later. This return code is used when the data cannot be stored because there was an error (ex.: not Radu Expires October 22, 2010 [Page 58] Internet-Draft AGAP April 2010 enough space on disk). 5.5. 5xx Permanent Server Error 5.5.1. 500 Reserved Reserved. 5.5.2. 510 Unknown Command The request could not be processed because this command is unknown or its syntax is wrong. 5.5.3. 511 Invalid Parameter The request could not be processed because the command has an invalid parameter. This answer can be returned even if there was more than one 0x20 character between command and its arguments or between arguments. 5.5.4. 512 Out of order This command has a valid syntax but must to be send after other command required by the logic of the server. (Ex.: PASS after USER in Pre-authenticated State.) 5.5.5. 521 Not found This command has a valid syntax but the searched argument does not exist or cannot be accessed. (Ex.: LIST with a path does not have any wildcard and it does not exist.) 5.5.6. 531 Banned The client is not allowed to interact with the server. (Ex.: the client's IP is blacklisted.) 6. All Possible Response Codes for All Commands 6.1. Non-authenticated State The Welcome Message: 200 401 410 531 QUIT: 200 AUTH: 510 511 Radu Expires October 22, 2010 [Page 59] Internet-Draft AGAP April 2010 AUTH mechanism: 200 511 CAPA: 200 SGZP: 200 510 STLS: 200 510 other: 510 6.2. Pre-authenticating State (PLAIN method) QUIT: 200 PASS: 510 511 512 PASS password: 200 511 512 USER: 510 511 USER account: 200 511 other: 510 6.3. Authenticated State QUIT: 200 COPY: 510 511 COPY arguments: 200 511 CPYF: 510 511 CPYF arguments: 200 511 DATT: 510 511 DATT arguments: 200 511 521 DELE: 510 511 DELE arguments: 200 511 DELF: 510 511 DELF arguments: 200 511 Radu Expires October 22, 2010 [Page 60] Internet-Draft AGAP April 2010 EXIT: 200 FCPY: 510 511 FCPY arguments: 200 511 FDEL: 511 FDEL arguments: 200 511 FIND: 511 FIND arguments: 200 511 FMOV: 510 511 FMOV arguments: 200 511 FTAG: 510 511 FTAG arguments: 200 511 GTAG: 510 511 GTAG arguments: 200 511 LIST: 200 LIST arguments: 200 511 521 MAKE: 510 511 MAKE arguments: 200 511 MOVE: 510 511 MOVE arguments: 200 511 MOVF: 510 511 MOVF arguments: 200 511 NAME: 510 511 NAME arguments: 200 511 NOOP: 200 Radu Expires October 22, 2010 [Page 61] Internet-Draft AGAP April 2010 RETR: 510 511 RETR arguments: 199 200 511 SLCT: 510 511 SLCT arguments: 200 511 SPAM: 510 511 SPAM arguments: 200 511 512 STAG: 510 511 STAG arguments: 200 511 STAT: 200 512 STOR: 200 410 511 other: 510 6.4. Not-selected State LIST: 200 LIST arguments: 200 511 521 SLCT: 510 511 SLCT arguments: 200 511 other: 510 7. Example of Conversations 7.1. Successful connection and authentication Radu Expires October 22, 2010 [Page 62] Internet-Draft AGAP April 2010 S: 200 Welcome C: AUTH PLAIN S: 200 OK Send USER C: USER account S: 200 OK Send PASS C: PASS password S: 200 OK Authenticated C: STAT S: .PATH /INBOX S: .TYPE MSG S: .TAGS RESERVED S: .TOTAL 10 S: .NEW 2 S: 200 OK Folder status displayed Figure 106 7.2. Successful connection but unsuccessful authentication S: 200 Welcome C: AUTH PLAIN S: 200 OK Send USER C: USER account S: 200 OK Send PASS C: PASS password S: 511 WRONG user/password pair Figure 107 7.3. Connection refused S: 531 Your IP is blacklisted Figure 108 S: 410 Too many connections, please retry later Figure 109 Radu Expires October 22, 2010 [Page 63] Internet-Draft AGAP April 2010 S: 401 Internal error, the server has an error in its configuration Figure 110 7.4. Find what folders are available with messages C: LIST /* S: .MESG /INBOX S: .MESG /TRASH S: .CALE /CALENDAR S: 200 OK LIST completed (3 matches) Figure 111 7.5. Retrieve a message C: SLCT /INBOX S: 200 OK Folder selected C: FIND S: 100 OK SEND filter definition (end it with an empty line) C: TAG NEW AND IS header/subject = 'Newsletter from Example.com' C: S: .UIDx1234 S: .UIDx1235 S: .UIDx2340 S: 200 OK FIND completed (3 matches) C: RETR UIDx1234 S: .
S: .HCCP<news@example.com> S: .newsletter@localhost.localdomain S: .HCCP Newsletter S: .
S: .This is your weekly newsletter. S: .
S: 200 OK RETR completed Figure 112 7.6. Retrieve a contact Radu Expires October 22, 2010 [Page 64] Internet-Draft AGAP April 2010 C: SLCT /CONTACT S: 200 OK Folder selected C: FIND S: 100 OK SEND filter definition (end it with an empty line) C: REGEX vcard/fn/text = 'RADU.*?' OR vcard/fn/text = '.*? Iulian' C: S: .CONx0001 S: 200 OK FIND completed (1 match) C: RETR CONx0001 S: . S: . S: . Iulian Radu S: . S: . Radu S: . Iulian S: . S: . Dipl.-Ing. S: . S: . S: . 1 S: . S: . 1 S: . de S: . S: . S: . work S: . Example Com S: . S: . S: . work S: . iulian.radu@gmx.at S: . S: . PUBLIC S: . S: . S: 200 OK RETR completed Figure 113 7.7. Retrieve an event C: SLCT /CALENDAR S: 200 OK Folder selected C: FIND S: 100 OK SEND filter definition (end it with an empty line) C: IS vcalendar/components/vevent/properties/location = 'Wien' C: OR IS vcalendar/components/vevent/properties/uid/text = Radu Expires October 22, 2010 [Page 65] Internet-Draft AGAP April 2010 C: 'uidx1234@example.com' C: S: .EVNx0001 S: 200 OK FIND completed (1 match) C: RETR EVNx0001 S: . S: . S: . S: . S: . -//amap/calender//NONSGML v1.0//EN S: . S: . 2.0 S: . S: . S: . S: . S: . Vienna S: . S: . S: . 2010 S: . 1 S: . 31 S: . 11 S: . 0 S: . 0 S: . S: . S: . S: . S: . 2010 S: . 11 S: . 2 S: . 21 S: . 30 S: . 0 S: . S: . S: . S: . S: . 2010 S: . 11 S: . 2 S: . S: . S: . S: . An event in Wien. S: . S: . Radu Expires October 22, 2010 [Page 66] Internet-Draft AGAP April 2010 S: . uidx1234@example.com S: . S: . S: . S: . S: . S: . S: 200 OK RETR completed Figure 114 7.8. Store a message C: SLCT /OUTBOX S: 200 OK Folder selected C: STOR S: 110 Send the message ended with an empty line C:
C: HCCP<news@example.com> C: newsletter@localhost.localdomain C: HCCP Newsletter C:
C: This is your weekly newsletter. C:
C: S: 200 OK Message stored (UID is UIDx1234) Figure 115 7.9. Store a contact Radu Expires October 22, 2010 [Page 67] Internet-Draft AGAP April 2010 C: SLCT /CONTACT S: 200 OK Folder selected C: STOR S: 110 Send the contact info ended with an empty line C: C: C: Iulian Radu C: C: Radu C: Iulian C: C: Dipl.-Ing. C: C: C: 1 C: C: 1 C: de C: C: C: work C: Example Com C: C: C: work C: iulian.radu@gmx.at C: C: PUBLIC C: C: C: S: 200 OK Contact stored (UID is UIDx1234) Figure 116 7.10. Store an event C: SLCT /CALENDAR S: 200 OK Folder selected C: STOR S: 110 Send the contact info ended with an empty line C: C: C: C: C: -//amap/calender//NONSGML v1.0//EN C: Radu Expires October 22, 2010 [Page 68] Internet-Draft AGAP April 2010 C: 2.0 C: C: C: C: C: Vienna C: C: C: 2010 C: 1 C: 31 C: 11 C: 0 C: 0 C: C: C: C: C: 2010 C: 11 C: 2 C: 21 C: 30 C: 0 C: C: C: C: C: 2010 C: 11 C: 2 C: C: C: C: An event in Wien. C: C: C: uidx1234@example.com C: C: C: C: C: C: C: S: 200 OK Event stored (UID is UIDx1234) Figure 117 Radu Expires October 22, 2010 [Page 69] Internet-Draft AGAP April 2010 7.11. Mark messages as SPAM an move them in a new folder C: STAG UIDx1000 + SPAM S: 200 OK STAG completed C: SPAM UIDx1000 header/subject S: 200 OK Message added to the spam database C: MAKE MESG /Archive-SPAM S: 200 OK Folder created C: FMOV /Archive-SPAM S: 100 OK SEND filter definition (end it with an empty line) C: TAG SPAM C: S: 200 OK FMOV completed (19 matches) Figure 118 7.12. Create a filter folder, find the matching entries of the filter and read its filter definition Radu Expires October 22, 2010 [Page 70] Internet-Draft AGAP April 2010 C: MAKE FILT /New-messages S: 200 OK Folder created C: STOR S: 110 Send the filter content ended with an empty line C: C: /INBOX C: C: SEEN C: C: C: S: 200 OK Filter stored C: SLCT /New-messages S: 200 OK Folder selected C: FIND S: .UIDx1234 /INBOX S: .UIDx1234 /Trash S: .UIDx1235 /Trash S: 200 OK FIND completed (3 matches) C: RETR S: . S: ./INBOX S: .SEEN S: . S: 200 OK RETR completed Figure 119 7.13. Create a folder and rename it C: MAKE MESG /My/NewFolder S: 200 OK Folder created C: NOOP S: 200 NOOP OK C: NAME /My/NewFolder AFolder S: 200 OK NAME completed Figure 120 7.14. Find the status for a folder Radu Expires October 22, 2010 [Page 71] Internet-Draft AGAP April 2010 C: LIST /* S: .MESG /INBOX S: .MESG /TRASH S: .CALE /CALENDAR S: 200 OK LIST completed (3 matches) C: SLCT /INBOX S: 200 OK SELECT completed C: STAT S: .PATH /INBOX S: .TYPE MSG S: .TAGS RESERVED S: .TOTAL 10 S: .NEW 5 S: 200 OK Folder status displayed Figure 121 7.15. Set and check the tags of a message C: STAG UIDx1000 + SEEN S: 200 OK STAG completed C: GTAG UIDx1000 S: UIDx1000 SEEN SPAM S: 200 OK GTAG completed Figure 122 7.16. Find messages that can be SPAM and delete them C: FTAG + SPAM S: 100 OK SEND filter definition (end it with an empty line) C: REGEX header/subject = '[Vv][i1]agra' C: S: 200 OK FTAG completed (10 matches) C: FDEL S: 100 OK SEND filter definition (end it with an empty line) C: UID 00000001:00001000 AND TAG SPAM C: S: 200 OK FDEL completed (10 matches) Figure 123 8. References Radu Expires October 22, 2010 [Page 72] Internet-Draft AGAP April 2010 8.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, June 1999. [RFC3552] Rescorla, E. and B. Korver, "Guidelines for Writing RFC Text on Security Considerations", BCP 72, RFC 3552, July 2003. 8.2. Informative References [I-D.daboo-et-al-icalendar-in-xml] Daboo, C., Douglass, M., and S. Lees, "xCal: The XML format for iCalendar", draft-daboo-et-al-icalendar-in-xml-02 (work in progress), March 2010. [I-D.ietf-vcarddav-vcardxml] Perreault, S., "vCard XML Representation", draft-ietf-vcarddav-vcardxml-02 (work in progress), March 2010. [RFC1952] Deutsch, P., Gailly, J-L., Adler, M., Deutsch, L., and G. Randers-Pehrson, "GZIP file format specification version 4.3", RFC 1952, May 1996. [RFC2821] Klensin, J., "Simple Mail Transfer Protocol", RFC 2821, April 2001. [RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO 10646", STD 63, RFC 3629, November 2003. [RFC3921] Saint-Andre, P., Ed., "Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence", RFC 3921, October 2004. [RFC5545] Desruisseaux, B., "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", RFC 5545, September 2009. Radu Expires October 22, 2010 [Page 73] Internet-Draft AGAP April 2010 Author's Address Iulian Radu (editor) Email: iulian.radu@gmx.at Radu Expires October 22, 2010 [Page 74]