mirror of
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655 lines
18 KiB
TypeScript
655 lines
18 KiB
TypeScript
/* eslint-disable n8n-nodes-base/node-filename-against-convention */
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import { ITriggerFunctions } from 'n8n-core';
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import {
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createDeferredPromise,
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IBinaryData,
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IBinaryKeyData,
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ICredentialsDecrypted,
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ICredentialTestFunctions,
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IDataObject,
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IDeferredPromise,
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INodeCredentialTestResult,
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INodeExecutionData,
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INodeType,
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INodeTypeBaseDescription,
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INodeTypeDescription,
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ITriggerResponse,
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LoggerProxy as Logger,
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NodeOperationError,
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} from 'n8n-workflow';
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import {
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connect as imapConnect,
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getParts,
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ImapSimple,
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ImapSimpleOptions,
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Message,
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} from 'imap-simple';
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import { simpleParser, Source as ParserSource } from 'mailparser';
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import _ from 'lodash';
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import { ICredentialsDataImap, isCredentialsDataImap } from '../../../credentials/Imap.credentials';
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const versionDescription: INodeTypeDescription = {
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displayName: 'Email Trigger (IMAP)',
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name: 'emailReadImap',
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icon: 'fa:inbox',
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group: ['trigger'],
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version: 2,
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description: 'Triggers the workflow when a new email is received',
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eventTriggerDescription: 'Waiting for you to receive an email',
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defaults: {
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name: 'IMAP Email',
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color: '#44AA22',
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},
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// eslint-disable-next-line n8n-nodes-base/node-class-description-inputs-wrong-regular-node
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inputs: [],
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outputs: ['main'],
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credentials: [
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{
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name: 'imap',
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required: true,
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testedBy: 'imapConnectionTest',
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},
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],
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properties: [
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{
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displayName: 'Mailbox Name',
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name: 'mailbox',
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type: 'string',
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default: 'INBOX',
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},
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{
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displayName: 'Action',
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name: 'postProcessAction',
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type: 'options',
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options: [
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{
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name: 'Mark as Read',
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value: 'read',
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},
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{
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name: 'Nothing',
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value: 'nothing',
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},
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],
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default: 'read',
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description:
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'What to do after the email has been received. If "nothing" gets selected it will be processed multiple times.',
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},
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{
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displayName: 'Download Attachments',
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name: 'downloadAttachments',
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type: 'boolean',
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default: false,
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displayOptions: {
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show: {
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format: ['simple'],
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},
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},
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description:
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'Whether attachments of emails should be downloaded. Only set if needed as it increases processing.',
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},
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{
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displayName: 'Format',
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name: 'format',
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type: 'options',
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options: [
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{
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name: 'RAW',
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value: 'raw',
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description:
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'Returns the full email message data with body content in the raw field as a base64url encoded string; the payload field is not used',
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},
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{
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name: 'Resolved',
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value: 'resolved',
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description:
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'Returns the full email with all data resolved and attachments saved as binary data',
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},
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{
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name: 'Simple',
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value: 'simple',
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description:
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'Returns the full email; do not use if you wish to gather inline attachments',
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},
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],
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default: 'simple',
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description: 'The format to return the message in',
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},
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{
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displayName: 'Property Prefix Name',
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name: 'dataPropertyAttachmentsPrefixName',
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type: 'string',
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default: 'attachment_',
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displayOptions: {
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show: {
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format: ['resolved'],
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},
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},
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description:
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'Prefix for name of the binary property to which to write the attachments. An index starting with 0 will be added. So if name is "attachment_" the first attachment is saved to "attachment_0"',
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},
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{
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displayName: 'Property Prefix Name',
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name: 'dataPropertyAttachmentsPrefixName',
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type: 'string',
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default: 'attachment_',
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displayOptions: {
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show: {
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format: ['simple'],
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downloadAttachments: [true],
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},
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},
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description:
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'Prefix for name of the binary property to which to write the attachments. An index starting with 0 will be added. So if name is "attachment_" the first attachment is saved to "attachment_0"',
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},
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{
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displayName: 'Options',
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name: 'options',
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type: 'collection',
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placeholder: 'Add Option',
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default: {},
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options: [
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{
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displayName: 'Custom Email Rules',
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name: 'customEmailConfig',
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type: 'string',
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default: '["UNSEEN"]',
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description:
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'Custom email fetching rules. See <a href="https://github.com/mscdex/node-imap">node-imap</a>\'s search function for more details.',
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},
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{
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displayName: 'Force Reconnect Every Minutes',
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name: 'forceReconnect',
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type: 'number',
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default: 60,
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description: 'Sets an interval (in minutes) to force a reconnection',
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},
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],
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},
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],
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};
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export class EmailReadImapV2 implements INodeType {
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description: INodeTypeDescription;
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constructor(baseDescription: INodeTypeBaseDescription) {
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this.description = {
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...baseDescription,
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...versionDescription,
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};
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}
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methods = {
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credentialTest: {
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async imapConnectionTest(
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this: ICredentialTestFunctions,
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credential: ICredentialsDecrypted,
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): Promise<INodeCredentialTestResult> {
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if (isCredentialsDataImap(credential.data)) {
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const credentials = credential.data as ICredentialsDataImap;
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try {
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const config: ImapSimpleOptions = {
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imap: {
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user: credentials.user,
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password: credentials.password,
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host: credentials.host,
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port: credentials.port,
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tls: credentials.secure,
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authTimeout: 20000,
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},
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};
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const tlsOptions: IDataObject = {};
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if (credentials.allowUnauthorizedCerts === true) {
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tlsOptions.rejectUnauthorized = false;
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}
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if (credentials.secure) {
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tlsOptions.servername = credentials.host;
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}
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if (!_.isEmpty(tlsOptions)) {
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config.imap.tlsOptions = tlsOptions;
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}
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const connection = await imapConnect(config);
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await connection.getBoxes();
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connection.end();
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} catch (error) {
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return {
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status: 'Error',
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message: error.message,
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};
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}
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return {
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status: 'OK',
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message: 'Connection successful!',
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};
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} else {
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return {
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status: 'Error',
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message: 'Credentials are no IMAP credentials.',
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};
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}
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},
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},
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};
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async trigger(this: ITriggerFunctions): Promise<ITriggerResponse> {
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const credentialsObject = await this.getCredentials('imap');
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const credentials = isCredentialsDataImap(credentialsObject) ? credentialsObject : undefined;
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if (!credentials) {
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throw new NodeOperationError(this.getNode(), `Credentials are not valid for imap node.`);
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}
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const mailbox = this.getNodeParameter('mailbox') as string;
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const postProcessAction = this.getNodeParameter('postProcessAction') as string;
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const options = this.getNodeParameter('options', {}) as IDataObject;
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const staticData = this.getWorkflowStaticData('node');
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Logger.debug('Loaded static data for node "EmailReadImap"', { staticData });
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let connection: ImapSimple;
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let closeFunctionWasCalled = false;
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let isCurrentlyReconnecting = false;
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// Returns the email text
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// tslint:disable-next-line:no-any
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const getText = async (parts: any[], message: Message, subtype: string) => {
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if (!message.attributes.struct) {
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return '';
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}
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const textParts = parts.filter((part) => {
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return (
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part.type.toUpperCase() === 'TEXT' && part.subtype.toUpperCase() === subtype.toUpperCase()
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);
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});
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if (textParts.length === 0) {
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return '';
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}
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try {
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return await connection.getPartData(message, textParts[0]);
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} catch {
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return '';
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}
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};
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// Returns the email attachments
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const getAttachment = async (
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connection: ImapSimple,
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// tslint:disable-next-line:no-any
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parts: any[],
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message: Message,
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): Promise<IBinaryData[]> => {
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if (!message.attributes.struct) {
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return [];
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}
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// Check if the message has attachments and if so get them
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const attachmentParts = parts.filter((part) => {
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return part.disposition && part.disposition.type.toUpperCase() === 'ATTACHMENT';
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});
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const attachmentPromises = [];
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let attachmentPromise;
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for (const attachmentPart of attachmentParts) {
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attachmentPromise = connection.getPartData(message, attachmentPart).then((partData) => {
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// Return it in the format n8n expects
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return this.helpers.prepareBinaryData(
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partData,
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attachmentPart.disposition.params.filename,
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);
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});
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attachmentPromises.push(attachmentPromise);
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}
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return Promise.all(attachmentPromises);
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};
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// Returns all the new unseen messages
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const getNewEmails = async (
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connection: ImapSimple,
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searchCriteria: Array<string | string[]>,
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): Promise<INodeExecutionData[]> => {
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const format = this.getNodeParameter('format', 0) as string;
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let fetchOptions = {};
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if (format === 'simple' || format === 'raw') {
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fetchOptions = {
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bodies: ['TEXT', 'HEADER'],
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markSeen: false,
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struct: true,
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};
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} else if (format === 'resolved') {
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fetchOptions = {
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bodies: [''],
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markSeen: false,
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struct: true,
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};
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}
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const results = await connection.search(searchCriteria, fetchOptions);
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const newEmails: INodeExecutionData[] = [];
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let newEmail: INodeExecutionData, messageHeader, messageBody;
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let attachments: IBinaryData[];
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let propertyName: string;
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// All properties get by default moved to metadata except the ones
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// which are defined here which get set on the top level.
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const topLevelProperties = ['cc', 'date', 'from', 'subject', 'to'];
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if (format === 'resolved') {
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const dataPropertyAttachmentsPrefixName = this.getNodeParameter(
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'dataPropertyAttachmentsPrefixName',
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) as string;
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for (const message of results) {
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if (
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staticData.lastMessageUid !== undefined &&
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message.attributes.uid <= (staticData.lastMessageUid as number)
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) {
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continue;
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}
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if (
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staticData.lastMessageUid === undefined ||
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(staticData.lastMessageUid as number) < message.attributes.uid
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) {
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staticData.lastMessageUid = message.attributes.uid;
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}
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const part = _.find(message.parts, { which: '' });
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if (part === undefined) {
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throw new NodeOperationError(this.getNode(), 'Email part could not be parsed.');
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}
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const parsedEmail = await parseRawEmail.call(
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this,
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part.body,
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dataPropertyAttachmentsPrefixName,
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);
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newEmails.push(parsedEmail);
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}
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} else if (format === 'simple') {
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const downloadAttachments = this.getNodeParameter('downloadAttachments') as boolean;
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let dataPropertyAttachmentsPrefixName = '';
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if (downloadAttachments === true) {
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dataPropertyAttachmentsPrefixName = this.getNodeParameter(
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'dataPropertyAttachmentsPrefixName',
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) as string;
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}
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for (const message of results) {
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if (
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staticData.lastMessageUid !== undefined &&
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message.attributes.uid <= (staticData.lastMessageUid as number)
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) {
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continue;
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}
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if (
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staticData.lastMessageUid === undefined ||
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(staticData.lastMessageUid as number) < message.attributes.uid
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) {
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staticData.lastMessageUid = message.attributes.uid;
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}
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const parts = getParts(message.attributes.struct!);
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newEmail = {
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json: {
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textHtml: await getText(parts, message, 'html'),
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textPlain: await getText(parts, message, 'plain'),
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metadata: {} as IDataObject,
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},
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};
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messageHeader = message.parts.filter((part) => {
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return part.which === 'HEADER';
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});
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messageBody = messageHeader[0].body;
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for (propertyName of Object.keys(messageBody)) {
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if (messageBody[propertyName].length) {
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if (topLevelProperties.includes(propertyName)) {
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newEmail.json[propertyName] = messageBody[propertyName][0];
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} else {
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(newEmail.json.metadata as IDataObject)[propertyName] =
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messageBody[propertyName][0];
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}
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}
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}
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if (downloadAttachments === true) {
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// Get attachments and add them if any get found
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attachments = await getAttachment(connection, parts, message);
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if (attachments.length) {
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newEmail.binary = {};
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for (let i = 0; i < attachments.length; i++) {
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newEmail.binary[`${dataPropertyAttachmentsPrefixName}${i}`] = attachments[i];
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}
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}
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}
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newEmails.push(newEmail);
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}
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} else if (format === 'raw') {
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for (const message of results) {
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if (
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staticData.lastMessageUid !== undefined &&
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message.attributes.uid <= (staticData.lastMessageUid as number)
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) {
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continue;
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}
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if (
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staticData.lastMessageUid === undefined ||
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(staticData.lastMessageUid as number) < message.attributes.uid
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) {
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staticData.lastMessageUid = message.attributes.uid;
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}
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const part = _.find(message.parts, { which: 'TEXT' });
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if (part === undefined) {
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throw new NodeOperationError(this.getNode(), 'Email part could not be parsed.');
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}
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// Return base64 string
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newEmail = {
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json: {
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raw: part.body,
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},
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};
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newEmails.push(newEmail);
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}
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}
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// only mark messages as seen once processing has finished
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if (postProcessAction === 'read') {
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const uidList = results.map((e) => e.attributes.uid);
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if (uidList.length > 0) {
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connection.addFlags(uidList, '\\SEEN');
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}
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}
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return newEmails;
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};
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const returnedPromise: IDeferredPromise<void> | undefined = await createDeferredPromise<void>();
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const establishConnection = (): Promise<ImapSimple> => {
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let searchCriteria = ['UNSEEN'] as Array<string | string[]>;
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if (options.customEmailConfig !== undefined) {
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try {
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searchCriteria = JSON.parse(options.customEmailConfig as string);
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} catch (error) {
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throw new NodeOperationError(this.getNode(), `Custom email config is not valid JSON.`);
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}
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}
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const config: ImapSimpleOptions = {
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imap: {
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user: credentials.user,
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password: credentials.password,
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host: credentials.host,
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port: credentials.port,
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tls: credentials.secure,
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authTimeout: 20000,
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},
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onmail: async () => {
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if (connection) {
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if (staticData.lastMessageUid !== undefined) {
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searchCriteria.push(['UID', `${staticData.lastMessageUid as number}:*`]);
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/**
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* A short explanation about UIDs and how they work
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* can be found here: https://dev.to/kehers/imap-new-messages-since-last-check-44gm
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* TL;DR:
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* - You cannot filter using ['UID', 'CURRENT ID + 1:*'] because IMAP
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* won't return correct results if current id + 1 does not yet exist.
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* - UIDs can change but this is not being treated here.
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* If the mailbox is recreated (lets say you remove all emails, remove
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* the mail box and create another with same name, UIDs will change)
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* - You can check if UIDs changed in the above example
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* by checking UIDValidity.
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*/
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Logger.debug('Querying for new messages on node "EmailReadImap"', { searchCriteria });
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}
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try {
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const returnData = await getNewEmails(connection, searchCriteria);
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if (returnData.length) {
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this.emit([returnData]);
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}
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} catch (error) {
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Logger.error('Email Read Imap node encountered an error fetching new emails', {
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error,
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});
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// Wait with resolving till the returnedPromise got resolved, else n8n will be unhappy
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// if it receives an error before the workflow got activated
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returnedPromise.promise().then(() => {
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this.emitError(error as Error);
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});
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}
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}
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},
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onupdate: async (seqno: number, info) => {
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Logger.verbose(`Email Read Imap:update ${seqno}`, info);
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},
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};
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const tlsOptions: IDataObject = {};
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if (credentials.allowUnauthorizedCerts === true) {
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tlsOptions.rejectUnauthorized = false;
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}
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if (credentials.secure) {
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tlsOptions.servername = credentials.host as string;
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}
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if (!_.isEmpty(tlsOptions)) {
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config.imap.tlsOptions = tlsOptions;
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}
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// Connect to the IMAP server and open the mailbox
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// that we get informed whenever a new email arrives
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return imapConnect(config).then(async (conn) => {
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conn.on('close', async (hadError: boolean) => {
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if (isCurrentlyReconnecting === true) {
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Logger.debug(`Email Read Imap: Connected closed for forced reconnecting`);
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} else if (closeFunctionWasCalled === true) {
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|
Logger.debug(`Email Read Imap: Shutting down workflow - connected closed`);
|
|
} else {
|
|
Logger.error(`Email Read Imap: Connected closed unexpectedly`);
|
|
this.emitError(new Error('Imap connection closed unexpectedly'));
|
|
}
|
|
});
|
|
conn.on('error', async (error) => {
|
|
const errorCode = error.code.toUpperCase();
|
|
Logger.verbose(`IMAP connection experienced an error: (${errorCode})`, { error });
|
|
await closeFunction();
|
|
this.emitError(error);
|
|
});
|
|
return conn;
|
|
});
|
|
};
|
|
|
|
connection = await establishConnection();
|
|
|
|
await connection.openBox(mailbox);
|
|
|
|
let reconnectionInterval: NodeJS.Timeout | undefined;
|
|
|
|
if (options.forceReconnect !== undefined) {
|
|
reconnectionInterval = setInterval(async () => {
|
|
Logger.verbose(`Forcing reconnect to IMAP server`);
|
|
try {
|
|
isCurrentlyReconnecting = true;
|
|
if (connection.closeBox) connection.closeBox(false);
|
|
connection.end();
|
|
connection = await establishConnection();
|
|
await connection.openBox(mailbox);
|
|
} catch (error) {
|
|
Logger.error(error);
|
|
} finally {
|
|
isCurrentlyReconnecting = false;
|
|
}
|
|
}, (options.forceReconnect as number) * 1000 * 60);
|
|
}
|
|
|
|
// When workflow and so node gets set to inactive close the connectoin
|
|
async function closeFunction() {
|
|
closeFunctionWasCalled = true;
|
|
if (reconnectionInterval) {
|
|
clearInterval(reconnectionInterval);
|
|
}
|
|
if (connection.closeBox) connection.closeBox(false);
|
|
connection.end();
|
|
}
|
|
|
|
// Resolve returned-promise so that waiting errors can be emitted
|
|
returnedPromise.resolve();
|
|
|
|
return {
|
|
closeFunction,
|
|
};
|
|
}
|
|
}
|
|
|
|
export async function parseRawEmail(
|
|
this: ITriggerFunctions,
|
|
messageEncoded: ParserSource,
|
|
dataPropertyNameDownload: string,
|
|
): Promise<INodeExecutionData> {
|
|
const responseData = await simpleParser(messageEncoded);
|
|
const headers: IDataObject = {};
|
|
for (const header of responseData.headerLines) {
|
|
headers[header.key] = header.line;
|
|
}
|
|
|
|
// @ts-ignore
|
|
responseData.headers = headers;
|
|
// @ts-ignore
|
|
responseData.headerLines = undefined;
|
|
|
|
const binaryData: IBinaryKeyData = {};
|
|
if (responseData.attachments) {
|
|
for (let i = 0; i < responseData.attachments.length; i++) {
|
|
const attachment = responseData.attachments[i];
|
|
binaryData[`${dataPropertyNameDownload}${i}`] = await this.helpers.prepareBinaryData(
|
|
attachment.content,
|
|
attachment.filename,
|
|
attachment.contentType,
|
|
);
|
|
}
|
|
// @ts-ignore
|
|
responseData.attachments = undefined;
|
|
}
|
|
|
|
return {
|
|
json: responseData as unknown as IDataObject,
|
|
binary: Object.keys(binaryData).length ? binaryData : undefined,
|
|
} as INodeExecutionData;
|
|
}
|