@spikedpunch/forge-plugin-google

forge-plugin-google

Google plugin for forge. The Google plugin provides 2 modes of operation: read and write.

read mode retrieves emails from the email account

write mode is currently a WIP, and does not function.

Usage

const { GooglePlugin, GoogleRateLimiter } = require('@spikedpunch/forge-plugin-google')

plugins: [
   { name: 'gmail', plugin: new GooglePlugin({
      email: '[e-mail]',
      auth: {
         jwt: {
            credsFile: 'relative/path/to/creds.json'
         }
      }
   })}
],
steps: [
   {
      // For retrieving emails
      alias: 'gmail-get',
      plugin: 'gmail',
      // The user's email address. Set to 'me' to specify the authenticated user
      userId: 'me',
      // (Optional) Provide a list of labels to filter on
      labels: [
         'label1', 'label2'
      ],
      // (Optional) Provide a boolean that determines if Spam and Trash emails are included
      includeSpamTrash: true,
      // (Optional) Only retrieve a certain number of emails at a time. 0 is not a valid option
      maxResults: 50,
      // (Optional) Filter the results by using a query (https://support.google.com/mail/answer/7190?hl=en)
      query: 'after:2004/04/16',
      // (Optional) Provide a rate limiter
      rateLimiter: new GoogleRateLimiter(/**/)
   },
   {
      // For Sending emails
      alias: 'gmail-send',
      plugin: 'gmail'
      from: '[e-mail]',
      to: [
         '[e-mail]', '[e-mail]'
      ],
      cc: [],  // Array | string of emails to CC
      bcc: [], // Array | string of emails to bcc
      subject: 'Email subject',
      // Can provide the body directly as a string
      body: `I'm a string body`,
      // Or can provide a stream
      body: {
         stream: 'stream-alias'  // This expects a text stream
      },
      // Attachments can take files or streams
      attachments: [
         { name: 'file.json', stream: 'stream-alias' },
         { name: 'file2.json', file: 'relative/path/to/file.json' }
      ],
      // Can also provide a single attachment
      attachments: {
         name: 'file1.json',
         stream: 'some-alias'
      }
   }
] 

GooglePluginOptions

auth

object (required)

See the auth section below for more details.

email

string (optional, defaults to 'me')

The email address to read from.

rateLimiter

IGoogleRatelimiter (optional, provides one by default)

See the rate limiter documentation below for more details.

Step

Two modes are supported: read and write.

Read Mode

In read mode, emails are retrieved and forwarded to the next stream.

userId

string

The email address to read from. If G-Suite Domain-wide delegation is enabled, it's the email address that will be impersonated.

labels

string | string[]

This is a list of email labels to filter on

includeSpamTrash

boolean

If set to true, will include emails from the Spam and Trash folders in the results.

maxResults

number

The number of emails to retrieve at a time. Tweak this value if you want to tune performance. 0 (zero) or less is not a valid option.

query

string

A query string to filter messages on. Google's documentation is not that great for this parameter (docs). Some examples include:

• in:sent after:2014/01/01 before:2014/02/01
• from:[e-mail] rfc822msgid:<[e-mail]> is:unread

rateLimiter

IGoogleRateLimiter (optional, defaults to using the one provided by the plugin)

See the rate limiter documentation below for more details.

 

Auth

Configuring GMail authentication is done using the auth key, with the type of authentication as the name of a child key.

For example:

// JWT Authentication
new GooglePlugin({
      email: '[e-mail]',
      auth: {
         jwt: {
            credsFile: 'relative/path/to/creds.json'
         }
      }
   })

// OAuth2
new GooglePlugin({
      email: '[e-mail]',
      auth: {
         oauth2: {
            clientId: 'xxxxxxx',
            clientSecret: 'xxxxxxx',
            refreshToken: 'xxxxxx'
         }
      }
   })

JWT

This uses JWT for authentication, and assumes you have setup your Google project to use JWT authentication.

credsFile

string

A relative path to the service account credentials file containing the private key, service account email, etc. This is what is downloaded from the Google developer console.

Example

plugins: [
   { 
      name: 'gmail',
      plugin: new GmailPlugin({
         auth: {
            jwt: {
               credsFile: 'creds/gmail.json'
            }
         },
         email: '[e-mail]'
      })
   }
]

 

Google Rate Limiter

A Google API rate limiter is used to ensure the API calls are within the Google APIs rate limits. By default, each forge-plugin-google step will get its own rate limiter. If you have several steps using the same plugin, with the same credentials, you will want to provide a rateLimiter, and ensure it's shared across the multiple steps. This ensures that all steps stay within the rate limits.

Optionally, you can provide your own rate limiter by implementing the IGoogleRateLimiter interface exposed by this plugin.

Example

let { GoogleRateLimiter } = require('@spikedpunch/forge-plugin-google')

let rateLimiter = new GoogleRateLimiter(250, 1000000000)

module.exports = {
   //...
   // Both steps will share the rate limiter
   steps: [
      {
         alias: 'gmail1',
         plugin: 'gmail'
         rateLimiter: rateLimiter
      },
      {
         alias: 'gmail2',
         plugin: 'gmail'
         rateLimiter: rateLimiter
      }
   ]
}