@misa198/eml-format
v0.0.4
Published
RFC 822 EML file format parser and builder
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Readme
EML file format
A pure Node.js library for parsing and building EML files, i.e. the e-mail message format described in RFC 822 (another link). EML is returned by the POP3 protocol and handled by many e-mail agents like Mozilla Thunderbird or Microsoft Outlook. An EML file consists of headers and body similar to the HTTP structure.
File extension: .eml
Mime type: message/rfc822What does EML look like?
Date: Wed, 29 Jan 2014 11:10:06 +0100
To: "Foo Bar" <[email protected]>
From: Online Shop <[email protected]>
Subject: Winter promotions
Content-Type: text/plain; charset=utf-8
Lorem ipsum...Getting Started
Setup
npm install -g eml-formatRead EML file
var fs = require('fs');
var emlformat = require('eml-format');
var eml = fs.readFileSync("sample.eml", "utf-8");
emlformat.read(eml, function(error, data) {
if (error) return console.log(error);
fs.writeFileSync("sample.json", JSON.stringify(data, " ", 2));
console.log(data);
});Output structure
{
"subject": "Winter promotions",
"from": "Online Shop <[email protected]>",
"to": "\"Foo Bar\" <[email protected]>",
"headers": {
"Date": "Wed, 29 Jan 2014 11:10:06 +0100",
"To": "\"Foo Bar\" <[email protected]>",
"From": "Online Shop <[email protected]>",
"Subject": "Winter promotions",
"Content-Type": "multipart/related; type=\"text/html\";\r\nboundary=\"b1_4afb675bba4c412783638afbee8e8c71\"",
"MIME-Version": "1.0"
},
"html": "<!DOCTYPE html>\r\n<html lang=\"en\">\r\n<head>\r\n<title>Lorem ipsum</title>\r\n=09<meta name=\"description\" ...",
"text": "Lorem ipsum dolor sit amet, consectetur adipiscing elit....",
"attachments": [
{
"name": "nodejs.png",
"mimeType": "image/png",
"data": {
"type": "Buffer",
"data": [ 137, 80, 78, 71, ... ]
}
}
]
}Command Line
A command line tool to extract an .eml file into a folder. The output directory will be populated with .txt and .html message and attachment files.
Usage:
eml-unpack [options] [message.eml] [directory]
Options:
--help Print this message
--verbose Enable detailed logging
--version Print version number
--json Create parsed.json and manifest.json
--no-unpack Used with --json to skip unpacking
Examples:
eml-unpack message.eml .
eml-unpack --verbose sample.eml folder
eml-unpack --json --no-unpack ./sample.eml ./folderReference
read(eml, [options], callback)
Parses EML file content and returns user-friendly object
| Argument | Type | Description |
|----------|------|-------------|
| eml | string or object | EML file content or object from 'parse' |
| options | object | Optional parameter, { headersOnly: true } (false by default) |
| callback | function(error, data) | Callback function to be invoked when read is complete |
parse(eml, [options], callback)
Parses EML file content and returns object-oriented representation of the content
| Argument | Type | Description |
|----------|------|-------------|
| eml | string | EML file content |
| options | object | Optional parameter, { headersOnly: true } (false by default) |
| callback | function(error, data) | Callback function to be invoked when parse is complete |
build(eml, callback)
Builds an EML message
| Argument | Type | Description | |----------|------|-------------| | data | object | E-mail data, see example | | callback | function(error, eml) | Callback function to be invoked when build is complete |
unpack(eml, directory, callback)
Unpacks EML message and attachments to a directory
| Argument | Type | Description | |----------|------|-------------| | eml | string or object | EML file content or object from 'parse' | | directory | string | Folder name or directory path where to unpack | | callback | function(error, data) | Callback function to be invoked when read is complete |
Examples
Read headers only
var fs = require('fs');
var emlformat = require('eml-format');
var eml = fs.readFileSync("sample.eml", "utf-8");
emlformat.read(eml, { headersOnly: true }, function(error, data) {
if (error) return console.log(error);
fs.writeFileSync("headers.json", JSON.stringify(data, " ", 2));
console.log(data);
console.log("Done!");
});Read the complete EML file
The parse function parses raw EML content into a JavaScript object for further processing.
var fs = require('fs');
var emlformat = require('eml-format');
var eml = fs.readFileSync("sample.eml", "utf-8");
emlformat.parse(eml, function(error, data) {
if (error) return console.log(error);
fs.writeFileSync("sample.json", JSON.stringify(data, " ", 2));
console.log(data);
console.log("Done!");
});Or use read instead of parse. The read function decodes the base64, quote-printable, =?UTF-8?...?= encoded content and extracts plain text, html content and attachments. So this method is a little slower but more user friendly.
emlformat.read(eml, function(error, data) {
if (error) return console.log(error);
fs.writeFileSync("user-friendly.json", JSON.stringify(data, " ", 2));
console.log(data);
console.log("Done!");
});Unpack files from an EML file
Extracts plain text, html content and attachments to a directory
var fs = require('fs');
var emlformat = require('eml-format');
var dir = "unpacked"; //Output directory
var eml = fs.readFileSync("sample.eml", "utf-8");
emlformat.unpack(eml, dir, function(error, data) {
if (error) return console.log(error);
console.log(data); //List of files
console.log("Done!");
});Create an EML file
var fs = require('fs');
var emlformat = require('eml-format');
var data = {
from: "[email protected]",
to: {
name: "Foo Bar",
email: "[email protected]"
},
subject: "Winter promotions",
text: "Lorem ipsum...",
html: '<html><head></head><body>Lorem ipsum...<br /><img src="nodejs.png" alt="" /></body></html>',
attachments: [
{
name: "sample.txt",
contentType: "text/plain; charset=utf-8",
data: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi eget elit turpis. Aliquam lorem nunc, dignissim in risus at, tempus aliquet justo..."
},
{
name: "nodejs.png",
contentType: "image/png",
data: fs.readFileSync("nodejs.png"),
inline: true
}
]
};
emlformat.build(data, function(error, eml) {
if (error) return console.log(error);
fs.writeFileSync("build.eml", eml);
console.log("Done!");
});Multiple e-mail addresses
var data = {
from: "[email protected]",
to: [
{ name: "Foo", email: "[email protected]" },
{ name: "Bar", email: "[email protected]" }
],
cc: [
{ name: "Foo Bar", email: "[email protected]" },
{ email: "[email protected]" }
],
subject: "Winter promotions",
...
};Register a new mime type file extension
var emlformat = require('eml-format');
emlformat.fileExtensions["application/zip"] = ".zip";
emlformat.fileExtensions["application/octet-stream"] = ".bin";Extract e-mail address and name
Plain text name
var emlformat = require('eml-format');
var data = emlformat.getEmailAddress('"Foo Bar" <[email protected]>');
//data.name == "Foo Bar";
//data.email == "[email protected]";UTF-8 encoded name
var emlformat = require('eml-format');
var data = emlformat.getEmailAddress('=?UTF-8?Q?You=E2=80=99re=20Foo=20Bar?= <[email protected]>');
//data.name == "You’re Foo Bar";
//data.email == "[email protected]";Multiple e-mail addresses
var emlformat = require('eml-format');
var data = emlformat.getEmailAddress('"Foo Bar" <[email protected]>, Example <[email protected]>');
//data = [
// { name: "Foo Bar", email: "[email protected]" },
// { name: "Example", email: "[email protected]" }
//]Build e-mail address
var emlformat = require('eml-format');
var string = emlformat.toEmailAddress({
name: "Foo Bar",
email: "[email protected]"
});
//string = "Foo Bar" <[email protected]>Decode "quoted-printable"
var emlformat = require('eml-format');
var message = emlformat.unquotePrintable("Join line 1=\r\n=20with line 2=0D=0A");Decode "=?UTF-8?...?=" string
var emlformat = require('eml-format');
var message = emlformat.unquoteUTF8("=?UTF-8?B?V2hhdOKAmXMgeW91ciBvbmxpbmUgc2hvcHBpbmcgc3R5bGU/?=");Decode other character set
var emlformat = require('eml-format');
var message = emlformat.unquoteString("=?ISO-8859-2?Q?Po=B9ta?=");