Parses and compiles IMAP commands.
npm install --save emailjs-imap-handler
import { parser, compiler } from emailjs-imap-handler
To parse a command you need to have the command as one complete Uint8Array (including all literals) without the ending <CR><LF>
import { parser } from emailjs-imap-handler
parser(imapCommand[, options]);
Where
- imapCommand is an Uint8Array without the final line break
- options (optional) contains options that affect the returned value
Where available options are
- valueAsString LITERAL and STRING values are returned as strings rather than Uint8Array objects. Defaults to true.
- literalPlus LITERAL+ allows the alternate form of literals in all IMAP commands (see: https://tools.ietf.org/html/rfc7888#section-4)
The function returns an object in the following form:
{
tag: "TAG",
command: "COMMAND",
attributes: [
{type: "SEQUENCE", value: "sequence-set"},
{type: "ATOM", value: "atom", section:[section_elements], partial: [start, end]},
{type: "STRING", value: "string"},
{type: "LITERAL", value: "literal"},
[list_elements]
]
}
Where
- tag is a string containing the tag
- command is the first element after tag
- attributes (if present) is an array of next elements
If section or partial values are not specified in the command, the values are also missing from the ATOM element
NB! Sequence numbers are identified as ATOM values if the value contains only numbers.
NB! NIL atoms are always identified as null
values, even though in some cases it might be an ATOM with value "NIL"
For example
import { parser } from 'emailjs-imap-handler'
const toTypedArray = str => new Uint8Array(str.split('').map(char => char.charCodeAt(0)))
parser(toTypedArray("A1 FETCH *:4 (BODY[HEADER.FIELDS ({4}\r\nDate Subject)]<12.45> UID)"));
Results in the following value:
{
"tag": "A1",
"command": "FETCH",
"attributes": [
[
{
"type": "SEQUENCE",
"value": "*:4"
},
{
"type": "ATOM",
"value": "BODY",
"section": [
{
"type": "ATOM",
"value": "HEADER.FIELDS"
},
[
{
"type": "LITERAL",
"value": "Date"
},
{
"type": "ATOM",
"value": "Subject"
}
]
],
"partial": [
12,
45
]
},
{
"type": "ATOM",
"value": "UID"
}
]
]
}
You can "compile" parsed or self generated IMAP command objects to IMAP command strings with
import { compiler } from emailjs-imap-handler
compiler(commandObject, asArray);
Where
- commandObject is an object parsed with
parser()
or self generated - asArray if set to
true
return the value as an array instead of a string where the command is split on LITERAL notions - isLogging if set to true, do not include literals and long strings, useful when logging stuff and do not want to include message bodies etc. Additionally nodes with
sensitive: true
options are also not displayed (useful with logging passwords) iflogging
is used.
The function returns a string or if asArray
is set to true, as an array which is split on LITERAL notions, eg. "{4}\r\nabcde" becomes ["{4}\r\n", "abcde"]. This is useful if you need to wait for "+" response from the server before you can transmit the literal data.
The input object differs from the parsed object with the following aspects:
- string, number and null (null values are all non-number and non-string falsy values) are allowed to use directly -
{type: "STRING", value: "hello"}
can be replaced with"hello"
- Additional types are used:
SECTION
which is an alias forATOM
andTEXT
which returns the input string as given with no modification (useful for server messages).
For example
var command = {
tag: "*",
command: "OK",
attributes: [
{
type: "SECTION",
section: [
{type: "ATOM", value: "ALERT"}
]
},
{type:"TEXT", value: "NB! The server is shutting down"}
]
};
compiler(command);
// * OK [ALERT] NB! The server is shutting down
Copyright (c) 2013 Andris Reinman
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