本文轉(zhuǎn)自：https://github.com/emailjs/emailjs-smtp-client/blob/master/README.md

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SMTP Client

SMTP Client allows you to connect to and stream data to a SMTP server in the browser.

StringEncoding API

This module requires?TextEncoder?and?TextDecoder?to exist as part of the StringEncoding API (see:?MDN?whatwg.org). Firefox 19+ is basically the only browser that supports this at the time of writing, while?Chromium in canary, not stable. Luckily,?there is a polyfill!

Depending on your browser, you might need?this polyfill for ArrayBuffer #slice, e.g. phantomjs.

TCPSocket API

There is a?shim?that brings?Mozilla-flavored?version of the?Raw Socket API?to other platforms.

If you are on a platform that uses forge instead of a native TLS implementation (e.g. chrome.socket), you have to set the .oncert(pemEncodedCertificate) handler that passes the TLS certificate that the server presents. It can be used on a trust-on-first-use basis for subsequent connection.

If forge is used to handle TLS traffic, you may choose to handle the TLS-related load in a Web Worker. Please use tlsWorkerPath to point to?tcp-socket-tls-worker.js!

Please take a look at the?tcp-socket documentation?for more information!

Installation

npm:

npm install --save emailjs-smtp-client

Quirks

• STARTTLS?is currently not supported
• Only?PLAIN,?USER?and?XOAUTH2?authentication mechanisms are supported.?XOAUTH2?expects a ready to use access token, no tokens are generated automatically.

Usage

AMD

Require?emailjs-smtp-client.js?as?emailjs-smtp-client

Global context

Include files?emailjs-smtp-client-response-parser.js?and?emailjs-smtp-client.js?on the page.

<script src="emailjs-smtp-client-response-parser.js"></script> <script src="emailjs-smtp-client.js"></script>

This exposes global variable?emailjs-smtp-client

API

Create?SmtpClient?object with:

var client = new SmtpClient(host, port, options)

where

• host?is the hostname to connect to (defaults to "localhost")
• port?is the port to connect to
• options?is an optional options object (see below)

Connection options

The following connection options can be used with?simplesmtp.connect:

• useSecureTransport?Boolean?Set to true, to use encrypted connection
• name?String?Client hostname for introducing itself to the server
• auth?Object?Authentication options. Depends on the preferred authentication method
  • user?is the username for the user (also applies to OAuth2)
  • pass?is the password for the user if plain auth is used
  • xoauth2?is the OAuth2 access token to be used instead of password. If both password and xoauth2 token are set, the token is preferred.
• authMethod?String?Force specific authentication method (eg.?"PLAIN"?for using?AUTH PLAIN?or?"XOAUTH2"?for?AUTH XOAUTH2)
• ca?(optional) (only in conjunction with this?TCPSocket shim) if you use TLS with forge, pin a PEM-encoded certificate as a string. Please refer to the?tcp-socket documentation?for more information!
• tlsWorkerPath?(optional) (only in conjunction with this?TCPSocket shim) if you use TLS with forge, this path indicates where the file for the TLS Web Worker is located. Please refer to the?tcp-socket documentation?for more information!
• disableEscaping?Boolean?If set to true, do not escape dots on the beginning of the lines
• logLength?Number?How many messages between the client and the server to log. Set to false to disable logging. Defaults to 6
• ignoreTLS?– if set to true, do not issue STARTTLS even if the server supports it
• requireTLS?– if set to true, always use STARTTLS before authentication even if the host does not advertise it. If STARTTLS fails, do not try to authenticate the user
• lmtp?- if set to true use LMTP commands instead of SMTP commands

Default STARTTLS support is opportunistic – if the server advertises STARTTLS in EHLO response, 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.

XOAUTH2

To authenticate using XOAUTH2, use the following authentication config

var config = {auth: {user: 'username', xoauth2: 'access_token' } };

See?XOAUTH2 docs?for more info.

Connection events

Once a connection is set up the following events can be listened to:

• onidle?- the connection to the SMTP server has been successfully set up and the client is waiting for an envelope.?NB!?this event is emitted multiple times - if an e-mail has been sent and the client has nothing to do,?onidle?is emitted again.
• onready?(failedRecipients)?- the envelope is passed successfully to the server and a message stream can be started. The argument is an array of e-mail addresses not accepted as recipients by the server. If none of the recipient addresses is accepted,?onerror?is emitted instead.
• ondone?(success)?- the message was sent
• onerror?(err)?- An error occurred. The connection will be closed shortly afterwards, so expect an?onclose?event as well
• onclose?(isError)?- connection to the client is closed. If?isError?is true, the connection is closed because of an error

Example:

client.onidle = function(){console.log("Connection has been established"); // this event will be called again once a message has been sent // so do not just initiate a new message here, as infinite loops might occur }

Sending an envelope

When an?onidle?event is emitted, an envelope object can be sent to the server. This includes a string?from?and a single string or an array of strings for?to?property.

Envelope can be sent with?client.useEnvelope(envelope)

// run only once as 'idle' is emitted again after message delivery var alreadySending = false;client.onidle = function(){ if(alreadySending){ return; } alreadySending = true; client.useEnvelope({ from: "me@example.com", to: ["receiver1@example.com", "receiver2@example.com"] }); }

The?to?part of the envelope must include?all?recipients from?To:,?Cc:?and?Bcc:?fields.

If envelope setup up fails, an error is emitted. If only some (not all) recipients are not accepted, the mail can still be sent. An?onready?event is emitted when the server has accepted the?from?and at least one?to?address.

client.onready = function(failedRecipients){if(failedRecipients.length){ console.log("The following addresses were rejected: ", failedRecipients); } // start transfering the e-mail }

Sending a message

When?onready?event is emitted, it is possible to start sending mail. To do this you can send the message with?client.sendcalls (you also need to call?client.end()?once the message is completed).

send?method returns the state of the downstream buffer - if it returns?true, it is safe to send more data, otherwise you should (but don't have to) wait for the?ondrain?event before you send more data.

NB!?you do not have to escape the dots in the beginning of the lines by yourself (unless you specificly define so with?disableEscaping?option).

client.onready = function(){client.send("Subject: test\r\n"); client.send("\r\n"); client.send("Message body"); client.end(); }

Once the message is delivered an?ondone?event is emitted. The event has an parameter which indicates if the message was accepted by the server (true) or not (false).

client.ondone = function(success){if(success){console.log("The message was transmitted successfully with "+response);} }

Logging

At any time you can access the traffic log between the client and the server from the?client.log?array.

client.ondone = function(success){// show the last message console.log(client.log.slice(-1)); }

Closing the connection

Once you have done sending messages and do not want to keep the connection open, you can gracefully close the connection with?client.quit()?or non-gracefully (if you just want to shut down the connection and do not care for the server) with?client.close().

If you run?quit?or?close?in the?ondone?event, then the next?onidle?is never called.

Get your hands dirty

git clone git@github.com:whiteout-io/smtpclient.git cd smtpclient npm install && npm test

To run the integration tests against a local smtp server

grunt smtp add the test folder as a chrome app (chrome settings -> extensions -> check 'developer mode' -> load unpacked extension)

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