emailjs-imap-client

HELP WANTED

Felix is not actively maintaining this library anymore. But this is the only IMAP client for JS that I am aware of, so I feel this library still has its value. Please let me know if you're interested in helping out, either via email or open an issue about that.

The work that's on the horizon is:

Removing the tcp-socket shim and use node's net and tls directly
Adding features as per requests
Refactor to allow streaming and cut down memory consumption
Stay up to date with developments in the IMAP protocol
Maintenance of the other related emailjs libraries
Maintenance and update of emailjs.org

Low-level IMAP client for all your IMAP needs.

Usage

npm install --save emailjs-imap-client

import ImapClient from 'emailjs-imap-client'

// Use this instead for CommonJS modules (Node.js)
var ImapClient = require('emailjs-imap-client').default

API

var client = new ImapClient(host[, port][, options])

Please note that instances cannot be reused! After terminating a connection or encountering an error, please create a new ImapClient instance!

Where

host is the hostname to connect to
port (optional) is the port to connect to (defaults to 143)
options (optional) is the options object
- logLevel is the verbosity, can be set to error, warn, info, debug. See src/common.js
- auth is the authentication information object
  - user is the username of the user (also applies to Oauth2)
  - pass is the password of the user
  - xoauth2 is the OAuth2 access token to be used instead of password
- id (optional) is the identification object for RFC2971 (ex. {name: 'myclient', version: '1'})
- useSecureTransport (optional) enables TLS
- ignoreTLS – if set to true, never uses STARTTLS before authentication even if the host advertises support for it
- requireTLS – if set to true, always uses STARTTLS before authentication even if the host does not advertise it. If STARTTLS fails, do not try to authenticate the user
- enableCompression - if set to true then use IMAP COMPRESS extension (rfc4978) if the server supports it (Gmail does). All data sent and received in this case is compressed with deflate

Default STARTTLS support is opportunistic – if the server advertises STARTTLS capability, the client tries to use it. If STARTTLS is not advertised, the clients sends passwords in the plain. You can use ignoreTLS and requireTLS to change this behavior by explicitly enabling or disabling STARTTLS usage.

Example

var client = new ImapClient('localhost', 143, {
    auth: {
        user: 'testuser',
        pass: 'testpass'
    }
});

Use of web workers with compression: If you use compression, we can spin up a Web Worker to handle the TLS-related computation off the main thread. To do this, you need to browserify emailjs-imap-client-compressor-worker.js, specify the path via options.compressionWorkerPath

client.onerror = function(error){}

Get server capability

Call client.openConnection() and client.close() without authentication to connect to server and get server capability before logging in:

var client = new ImapClient('localhost', 143);
client.openConnection().then(capability => {
  client.close()
  /* check capability too see, for example, if server is a gmail server and thereby decide on how to authenticate when connecting */
});

Initiate connection

Call client.connect() to establish an IMAP connection:

client.connect().then(() => { /* ready to roll */ });

Close connection

There are two ways to close the connection.

The IMAP way is to send the LOGOUT command with logout().

client.logout().then(() => { /* connection terminated */ });

This method doesn't actually terminate the connection, it sends LOGOUT command to the server, to which the server responds by closing the connection.

The better way is to force-close the connection with close(). This closes the TCP socket and is independent of the network status.

client.close().then(() => { /* connection terminated */ });

List mailboxes

List all mailboxes with listMailboxes() method

client.listMailboxes().then((mailboxes) => { ... })

Mailbox object is with the following structure

root (boolean) true if the node is root
name (string) unicode decoded name of the mailbox
path (string) full path to the mailbox
delimiter (string) path delimiting symbol. In the event the server returns NIL for this (some servers do this for the INBOX), it will be coerced to a '/' at this time, but the behavior may be changed in the future depending on how the folder creation API is implemented.
listed (boolean) mailbox was found in the LIST response
subscribed (boolean) mailbox was found in the LIST (SUBSCRIBED) response if LIST-EXTENDED response otherwise in LSUB response
specialUse (string) mailbox was identified as a special use mailbox ('\Trash', '\Sent', '\Junk' etc. see RFC6154)
specialUseFlag (string) the same as specialUse but without using folder name based heuristics
flags (array) a list of flags
children (array) a list of child mailboxes

Example mailboxes object:

{
  "root": true,
  "children": [
    {
      "name": "INBOX",
      "delimiter": "/",
      "path": "INBOX",
      "children": [],
      "flags": ["\\HasNoChildren"],
      "listed": true,
      "subscribed": true
    },
    {
      "name": "[Gmail]",
      "delimiter": "/",
      "path": "[Gmail]",
      "flags": ["\\Noselect","\\HasChildren"],
      "listed": true,
      "subscribed": true,
      "children": [
        {
          "name": "All Mail",
          "delimiter": "/",
          "path": "[Gmail]/All Mail",
          "children": [],
          "flags": ["\\HasNoChildren","\\All"],
          "listed": true,
          "specialUse": "\\All",
          "specialUseFlag": "\\All",
          "subscribed": true
        }
      ]
    }
  ]
}

Root level INBOX is case insensitive, so all subfolders of INBOX, Inbox etc. are mapped together. The first occurence of INBOX defines the name property for the parent element. path values remain as listed.

For example the following IMAP response lists different INBOX names:

    * LIST () "INBOX"
    * LIST () "Inbox/test"

These different INBOX names are mapped to the following object:

{
  "root": true,
  "children": [
    {
      "name": "INBOX",
      "delimiter": "/",
      "path": "INBOX",
      "children": [
        {
          "name": "test",
          "delimiter": "/",
          "path": "Inbox/test",
        }
      ]
    }
  ]
}

List namespaces

List available namespaces with listNamespaces(). If NAMESPACE extension is not supported, the method is a no-op.

Namespace object is with the following structure

personal is an array of namespace elements or false for Personal Namespace
users is an array of namespace elements or false for Other Users' Namespace
shared is an array of namespace elements or false for Shared Namespace

Namespace element object has the following structure

prefix is the prefix string
delimiter is the hierarchy delimiter. This can be null for some servers but will usually be a string.

NB! Namespace_Response_Extensions are not supported (extension data is silently skipped)

Namespaces should be checked before attempting to create new mailboxes - most probably creating mailboxes outside personal namespace fails. For example when the personal namespace is prefixed with 'INBOX.' you can create 'INBOX.Sent Mail' but you can't create 'Sent Mail'.

Example:

client.listNamespaces().then((namespaces) => { ... })

{
    "personal": [
        {
            "prefix": "",
            "delimiter": "/"
        }
    ],
    "users": false,
    "shared": false
}

Subscribe to mailbox

Subscribe to a mailbox with the given path with subscribeMailbox(path).

Subscribing to a mailbox that is already subscribed is redundant and does return an OK just as when subscribing to unsubscribed mailbox.

Command: SUBSCRIBE

Example

// On a server with unsubscribed Sent mailbox
client.subscribeMailbox('Sent').then(() => { ... });

Unsubscribe from mailbox

Unsubscribe from a mailbox with the given path with unsubscribeMailbox(path).

Unsubscribing from a mailbox that is already unsubscribed is redundant and does return an OK just as when unsubscribing from a subscribed mailbox.

Command: UNSUBSCRIBE

Example

// On a server with subscribed Sent mailbox
client.unsubscribeMailbox('Sent').then(() => { ... });

Create mailbox

Create a folder with the given path with createMailbox(path). You currently need to manually build the path string yourself.

If the server indicates a failure that the folder already exists, but responds with the ALREADYEXISTS response code, the request will be treated as a success.

Command: CREATE

Example

// On a server with a personal namesapce of INBOX and a delimiter of '/',
// create folder Foo.  Note that folders using a non-empty personal namespace
// may automatically assume the personal namespace.
client.createMailbox('INBOX/Foo').then(() => { ... });

// Do the same on a server where the personal namespace is ''
client.createMailbox('Foo').then(() => { ... });

Delete mailbox

Delete a folder with the given path with deleteMailbox(path).

Command: DELETE

Example

client.deleteMailbox('Foo').then(() => { ... });

Select mailbox

Select specific mailbox by path with selectMailbox(path, options)

Where

path is the full path to the mailbox (see path property with listMailboxes)
options optional options object with the following properties
- condstore if set to true adds (CONDSTORE) option when selecting
- readOnly if set to true uses EXAMINE instead of SELECT

Resolves with

mailboxInfo is an object with mailbox properties
- exists (number) the count of messages in the selected mailbox
- flags (array) an array of flags used in the selected mailbox
- permanentFlags (array) an array of permanent flags available to use in the selected mailbox
- readOnly (boolean) true if the mailbox is in read only mode
- uidValidity (number) UIDValidity value
- uidNext (number) predicted next UID value
- highestModseq (string) (with CONDSTORE only) highest modseq value (javascript can't handle 64bit uints so this is a string)

Example

client.selectMailbox('INBOX').then((mailbox) => { ... });

{
    "readOnly": false,
    "exists": 6596,
    "flags": [
        "\\Answered",
        "\\Flagged"
    ],
    "permanentFlags": [
        "\\Answered",
        "\\Flagged"
    ],
    "uidValidity": 2,
    "uidNext": 38361,
    "highestModseq": "3682918"
}

List messages

List messages with listMessages(path, sequence, query[, options])

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing FETCH if not already selected.
sequence defines the range of sequence numbers or UID values (if byUid option is set to true). Example: '1', '1:*', '1,2:3,4' etc.
query is an array of keys that need to be fetched. Example: ['uid', 'flags', 'body.peek[headers (date)]']
options is an optional options object
- byUid if true executes UID FETCH instead of FETCH
- changedSince is the modseq filter. Only messages with higher modseq value will be returned
- valueAsString LITERAL and STRING values are returned as strings rather than Uint8Array objects. Defaults to true.

Resolves with

messages is an array of messages from the provided sequence range

A note about sequence ranges: This method does not stream the values, so using * as a range selector might be a really bad idea. If the mailbox contains thousands of messages and you are running a 1:* query, it might choke your application. Additionally, remember that * stands for the sequence number of the last message in the mailbox. This means that if you have 10 messages in a mailbox and you run a query for a range of 5000:* you still get a match as the query is treated as 10:5000 by the server

IMAP Commands: FETCH, CHANGEDSINCE

Example

client.listMessages('INBOX', '1:10', ['uid', 'flags', 'body[]']).then((messages) => {
    messages.forEach((message) => console.log('Flags for ' + message.uid + ': ' + message.flags.join(', ')));
});

Message item

A listed message item includes (but is not limited to), the selected fields from the query argument (all keys are lowercase). Additionally the argument order and even argument names might not match. For example, when requesting for body.peek you get body back instead. Additionally the message includes a special key # which stands for the sequence number of the message.

Most arguments return strings (eg. body[]) and numbers (eg. uid) while flags return an array, envelope and bodystructure return a processed object.

{
    "#": 123,
    "uid": 456,
    "flags": ["\\Seen", "$MyFlag"],
    "envelope": {
        "date": "Fri, 13 Sep 2013 15:01:00 +0300",
        "subject": "hello 4",
        "from": [{"name": "sender name", "address": "sender@example.com"}],
        "to": [{"name": "Receiver name", "address": "receiver@example.com"}],
        "message-id": "<abcde>"
    }
}

Special keys - if a special key is used, eg. BODY.PEEK[HEADER (Date Subject)], the response key is lowercase and in the form how the server responded it, eg. body[header (date subject)]

Envelope object

An envelope includes the following fields (a value is only included in the response if it is set).

date is a date (string) of the message
subject is the subject of the message
from is an array of addresses from the from header
sender is an array of addresses from the sender header
reply-to is an array of addresses from the reply-to header
to is an array of addresses from the to header
cc is an array of addresses from the cc header
bcc is an array of addresses from the bcc header
in-reply-to is the message-id of the message is message is replying to
message-id is the message-id of the message

All address fields are in the following format:

[{
    "name": "MIME decoded name",
    "address": "email@address"
}]

Bodystructure object

A bodystructure object includes the following fields (all values are lowercase, unless the value might be case sensitive, eg. Content-Id value):

part is the sub-part selector for BODY[x.x.x], eg. '4.1.1' (this value is not set for the root object)
type is the Content-Type of the body part
parameters is an object defining extra arguments for Content-Type, example: {border: 'abc'}
disposition is the Content-Disposition value (without arguments)
dispositionParameters is an object defining extra arguments for Content-Disposition, example: {filename: 'foo.gif'}
language is an array of language codes (hardly ever used)
location is a string for body content URI (hardly ever used)
id is the Content-Id value
description is the Content-Description value
encoding is the Content-Transfer-Encoding value
size is the body size in octets
lineCount (applies to text/* and message/rfc822) is the count of lines in the body
envelope (applies to message/rfc822) is the envelope object of the sub-part
md5 is the MD5 hash of the message (hardly ever used)
childNodes (applies to multipart/* and message/rfc822) is an array of embedded bodystructure objects

Example

Bodystructure for the following sample message structure:

multipart/mixed
    text/plain
    multipart/alternative
        text/plain

{
    "type": "multipart/mixed",
    "childNodes": [
        {
            "part": "1",
            "type": "text/plain",
            "encoding": "7bit",
            "size": 8,
            "lineCount": 1
        },
        {
            "part": "2",
            "type": "multipart/alternative",
            "childNodes": [
                {
                    "part": "2.1",
                    "type": "text/plain",
                    "encoding": "7bit",
                    "size": 8,
                    "lineCount": 1
                }
            ]
        }
    ]
}

Searching

Search for messages with search(path, query[, options])

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing SEARCH if not already selected.
query defines the search terms, see below
options is an optional options object
- byUid if true executes UID SEARCH instead of SEARCH

Resolves with

* **results** is an array of sorted and unique message sequence numbers or UID numbers that match the specified search query

Queries are composed as objects where keys are search terms and values are term arguments. Only strings, numbers and Date values are used as arguments. If the value is an array, the members of it are processed separately (use this for terms that require multiple params). If the value is a Date, it is converted to the form of '1-Jan-1970'. Subqueries (OR, NOT) are made up of objects.

Command: SEARCH

Examples:

// SEARCH UNSEEN
query = {unseen: true}
// SEARCH KEYWORD 'flagname'
query = {keyword: 'flagname'}
// SEARCH HEADER 'subject' 'hello world'
query = {header: ['subject', 'hello world']};
// SEARCH UNSEEN HEADER 'subject' 'hello world'
query = {unseen: true, header: ['subject', 'hello world']};
// SEARCH OR UNSEEN SEEN
query = {or: {unseen: true, seen: true}};
// SEARCH UNSEEN NOT SEEN
query = {unseen: true, not: {seen: true}}
// SINCE 2011-11-23
query = {since: new Date(2011, 11, 23, 0, 0, 0)}

Example

client.search('INBOX', {unseen: true}, {byUid: true}).then((result) => {
    result.forEach((uid) => console.log('Message ' + uid + ' is unread'));
});

Update flags

Update message flags with setFlags(path, sequence, flags[, options]). This is a wrapper around store()

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing if not already selected.
sequence defines the range of sequence numbers or UID values (if byUid option is set to true). Example: '1', '1:*', '1,2:3,4' etc.
flags is an object defining flag updates, see below for details
options is an optional options object
- byUid if true executes UID SEARCH instead of SEARCH
- silent if true does not return anything. Useful when updating large range of messages at once ('1:*')

Resolves with

* **messages** is an array of messages from the provided sequence range (or empty when `silent:true` option is set). Includes `flags` property and `uid` if `byUid:true` option was used.

Reading flags

You can check the flags for a message or a range of messages with listMessages - use ['flags'] as the query object.

Flag update object

{ set: arrFlags } for setting flags
{ add: arrFlags } for adding new flags
{ remove: arrFlags } for removing specified flags

Where arrFlags is an array containing flag strings, ie. ['\\Seen', '$MyFlag']

client.setFlags('INBOX', '1:10', {set: ['\\Seen']}).then((messages) => { ... })

client.setFlags('INBOX', '1:10', {remove: ['\\Seen']}).then((messages) => { ... })

client.setFlags('INBOX', '1:10', {add: ['\\Seen']}).then((messages) => { ... })

Store Command

The client also allows direct access to the STORE command, but please use setFlags() for convenience. Anyway, store flags or labels with store(path, sequence, action, flags[, options]).

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing if not already selected.
sequence defines the range of sequence numbers or UID values (if byUid option is set to true). Example: '1', '1:*', '1,2:3,4' etc.
action is the STORE argument, eg 'FLAGS' for setting flags
flags is an array of flags or labels
options is an optional options object
- byUid if true executes UID SEARCH instead of SEARCH
- silent if true does not return anything. Useful when updating large range of messages at once ('1:*')

Resolves with

messages is an array of messages from the provided sequence range (or empty when silent:true option is set). Includes flags property and uid if byUid:true option was used.

Possible actions

FLAGS - overwrite message flags with provided ones
+FLAGS - add provided flags to message flags
-FLAGS - remove provided flags from message flags
X-GM-LABELS - GMail-only IMAP extension to overwrite message labels with provided ones
+X-GM-LABELS - GMail-only IMAP extension to add provided labels to message labels
-X-GM-LABELS - GMail-only IMAP extension to remove provided labels from message labels

Command: STORE

client.store('INBOX', '1:*', '+X-GM-LABELS', ['\\Sent']).then((messages) => { ... }); // adds GMail `\Sent` label to messages

Delete messages

Delete messages with deleteMessages(path, sequence[, options])

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing if not already selected.
sequence defines the range of sequence numbers or UID values (if byUid option is set to true). Example: '1', '1:*', '1,2:3,4' etc.
options is an optional options object
- byUid if true uses UID values instead of sequence numbers to define the range

Resolves when IMAP server completed the command.

If possible (byUid:true is set and UIDPLUS extension is supported by the server) uses UID EXPUNGE otherwise falls back to EXPUNGE to delete the messages – which means that this method might be destructive. If EXPUNGE is used, then any messages with \Deleted flag set are deleted even if these messages are not included in the specified sequence range.

Commands: EXPUNGE, UID EXPUNGE

Example

client.deleteMessages('INBOX', '1:5').then(() => { ... });

Copy messages

Copy messages with copyMessages(sequence, destination[, options])

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing if not already selected.
sequence defines the range of sequence numbers or UID values (if byUid option is set to true). Example: '1', '1:*', '1,2:3,4' etc.
destination is the destination folder path. Example: '[Gmail]/Trash'
options is an optional options object
- byUid if true uses UID values instead of sequence numbers to define the range

Resolves with an object which contains uid sets of source and destination uids if the server supports UIDPLUS.

srcSeqSet is the uid set of the copied messages in the source mailbox
destSeqSet is the uid set of the copied messages in the destination mailbox

Command: COPY

Example

client.copyMessages('INBOX', '1:5', '[Gmail]/Trash').then(({srcSeqSet, destSeqSet}) => { ... });

Upload a message

Upload a message with upload(destination, message, [, options])

Where

destination is the destination folder path. Example: '[Gmail]/Trash'
message is the message to be uploaded
options is an optional options object
- flags is an array of flags you want to set on the uploaded message. Defaults to [\Seen]. (optional)

Resolves with the new uid of the message in the destination folder if the server supports UIDPLUS.

Command: APPEND

Example

client.upload('INBOX', message).then((uid) => { ... });

Move messages

Move messages with moveMessages(path, sequence, destination[, options])

Where

path is the path for the mailbox which should be selected for the command. Selects mailbox prior to executing if not already selected.
sequence defines the range of sequence numbers or UID values (if byUid option is set to true). Example: '1', '1:*', '1,2:3,4' etc.
destination is the destination folder path. Example: '[Gmail]/Trash'
options is an optional options object
- byUid if true uses UID values instead of sequence numbers to define the range

Resolves when IMAP server completed the command.

If possible (MOVE extension is supported by the server) uses MOVE or UID MOVE otherwise falls back to COPY + EXPUNGE.

Command: MOVE

Example

client.moveMessages('INBOX', '1:5', '[Gmail]/Trash').then(() => { ... });

Events

Keeping synchronization with your IMAP server

It is recommended to set up some sort of local caching for the messages. Please note that IMAP relies on a mixture of mailbox-unique identifiers (UID) and sequence numbers, so a mapping between both is definitely recommended.

There are two kinds of updates: 1) When something happens in the currently selected mailbox, and 2) when you select a mailbox

Updates for the selected mailbox

Your IMAP server sends you updates when something happens in the mailbox you have currently selected. Message updates can be listened for by setting the onupdate handler. First argument for the callback is the path, the second is the update type, and the third one is the new value.

Example

client.onupdate = function(path, type, value){
    if (type === 'expunge') {
      // untagged EXPUNGE response, e.g. "* EXPUNGE 123"
      // value is the sequence number of the deleted message prior to deletion, so adapt your cache accordingly
    } else if (type === 'exists') {
      // untagged EXISTS response, e.g. "* EXISTS 123"
      // value is new EXISTS message count in the selected mailbox
    } else if (type === 'fetch') {
      // untagged FETCH response, e.g. "* 123 FETCH (FLAGS (\Seen))"
      // add a considerable amount of input tolerance here!
      // probably some flag updates, a message or messages have been altered in some way
      // UID is probably not listed, probably includes only the sequence number `#` and `flags` array
    }
}

Mailbox change notifications

For your everyday tasks, this client doesn't really require you to explicitly select a mailbox, even though having an eye on which mailbox is selected is useful to receive untagged updates. When a mailbox is opened or closed, the onselectmailbox and onclosemailbox handlers are called.

For onselectmailbox handler the first argument is the path of the selected mailbox and the second argument is the mailbox information object (see selectMailbox).

For onclosemailbox handler the argument is the path of the selected mailbox.

Example

client.onselectmailbox = function(path, mailbox){
    console.log('Opened %s with %s messages', path, mailbox.exists);
}

client.onclosemailbox = function(path){
    console.log('Closed %s', path);
}

The IMAP client has several events you can attach to by setting a listener

Handling fatal error event

The invocation of onerror indicates an irrecoverable error. When onerror is fired, the connection is already closed, hence there's no need for further cleanup.

Get your hands dirty

$ git clone git@github.com:emailjs/emailjs-imap-client.git
$ cd emailjs-imap-client
$ npm install
$ npm test

License

Copyright (c) 2014 Andris Reinman

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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emailjs-imap-client

HELP WANTED

Usage

API

Get server capability

Initiate connection

Close connection

List mailboxes

List namespaces

Subscribe to mailbox

Unsubscribe from mailbox

Create mailbox

Delete mailbox

Select mailbox

List messages

Message item

Envelope object

Bodystructure object

Searching

Example

Update flags

Reading flags

Flag update object

Store Command

Delete messages

Example

Copy messages

Example

Upload a message

Example

Move messages

Example

Events

Keeping synchronization with your IMAP server

Updates for the selected mailbox

Mailbox change notifications

Handling fatal error event

Get your hands dirty

License

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