mirror of
https://github.com/n8n-io/n8n.git
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534 lines
16 KiB
TypeScript
534 lines
16 KiB
TypeScript
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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IDataObject,
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IDeferredPromise,
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INodeExecutionData,
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INodeType,
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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 {
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simpleParser,
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Source as ParserSource,
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} from 'mailparser';
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import _ from 'lodash';
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export class EmailReadImap implements INodeType {
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description: INodeTypeDescription = {
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displayName: 'EmailReadImap',
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name: 'emailReadImap',
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icon: 'fa:inbox',
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group: ['trigger'],
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version: 1,
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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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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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},
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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: '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: [
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'simple',
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],
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},
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},
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description: '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: '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: '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: '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: [
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'resolved',
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],
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},
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},
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description: '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: [
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'simple',
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],
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downloadAttachments: [
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true,
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],
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},
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},
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description: '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: '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: 'Ignore SSL Issues',
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name: 'allowUnauthorizedCerts',
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type: 'boolean',
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default: false,
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description: 'Whether to connect even if SSL certificate validation is not possible',
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},
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{
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displayName: 'Force Reconnect',
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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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async trigger(this: ITriggerFunctions): Promise<ITriggerResponse> {
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const credentials = await this.getCredentials('imap');
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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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// Returns the email text
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const getText = async (parts: any[], message: Message, subtype: string) => { // tslint:disable-line:no-any
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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 part.type.toUpperCase() === 'TEXT' && part.subtype.toUpperCase() === subtype.toUpperCase();
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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 (connection: ImapSimple, parts: any[], message: Message): Promise<IBinaryData[]> => { // tslint:disable-line:no-any
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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)
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.then((partData) => {
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// Return it in the format n8n expects
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return this.helpers.prepareBinaryData(partData, attachmentPart.disposition.params.filename);
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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 (connection: ImapSimple, searchCriteria: Array<string | string[]>): 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: postProcessAction === 'read',
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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: postProcessAction === 'read',
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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 = [
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'cc',
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'date',
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'from',
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'subject',
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'to',
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];
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if (format === 'resolved') {
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const dataPropertyAttachmentsPrefixName = this.getNodeParameter('dataPropertyAttachmentsPrefixName') as string;
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for (const message of results) {
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if (staticData.lastMessageUid !== undefined && message.attributes.uid <= (staticData.lastMessageUid as number)) {
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continue;
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}
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if (staticData.lastMessageUid === undefined || staticData.lastMessageUid as number < message.attributes.uid) {
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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(this, part.body, dataPropertyAttachmentsPrefixName);
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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('dataPropertyAttachmentsPrefixName') as string;
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}
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for (const message of results) {
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if (staticData.lastMessageUid !== undefined && message.attributes.uid <= (staticData.lastMessageUid as number)) {
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continue;
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}
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if (staticData.lastMessageUid === undefined || staticData.lastMessageUid as number < message.attributes.uid) {
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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] = 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 (staticData.lastMessageUid !== undefined && message.attributes.uid <= (staticData.lastMessageUid as number)) {
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continue;
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}
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if (staticData.lastMessageUid === undefined || staticData.lastMessageUid as number < message.attributes.uid) {
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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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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 = [
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'UNSEEN',
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] 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 as string,
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password: credentials.password as string,
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host: credentials.host as string,
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port: credentials.port as number,
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tls: credentials.secure as boolean,
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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', { error });
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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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};
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const tlsOptions: IDataObject = {};
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if (options.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('error', async error => {
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const errorCode = error.code.toUpperCase();
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if (['ECONNRESET', 'EPIPE'].includes(errorCode)) {
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Logger.verbose(`IMAP connection was reset (${errorCode}) - reconnecting.`, { error });
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try {
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connection = await establishConnection();
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await connection.openBox(mailbox);
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return;
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} catch (e) {
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Logger.error('IMAP reconnect did fail', { error: e });
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// If something goes wrong we want to run emitError
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}
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} else {
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Logger.error('Email Read Imap node encountered a connection error', { error });
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this.emitError(error);
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}
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});
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return conn;
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});
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};
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connection = await establishConnection();
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await connection.openBox(mailbox);
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let reconnectionInterval: NodeJS.Timeout | undefined;
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if (options.forceReconnect !== undefined) {
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reconnectionInterval = setInterval(async () => {
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Logger.verbose('Forcing reconnection of IMAP node.');
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await connection.end();
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connection = await establishConnection();
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await connection.openBox(mailbox);
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}, options.forceReconnect as number * 1000 * 60);
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}
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// When workflow and so node gets set to inactive close the connectoin
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async function closeFunction() {
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if (reconnectionInterval) {
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clearInterval(reconnectionInterval);
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}
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await connection.end();
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}
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// Resolve returned-promise so that waiting errors can be emitted
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returnedPromise.resolve();
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return {
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closeFunction,
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};
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}
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}
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export async function parseRawEmail(this: ITriggerFunctions, messageEncoded: ParserSource, dataPropertyNameDownload: string): Promise<INodeExecutionData> {
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const responseData = await simpleParser(messageEncoded);
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const headers: IDataObject = {};
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for (const header of responseData.headerLines) {
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headers[header.key] = header.line;
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}
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// @ts-ignore
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responseData.headers = headers;
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// @ts-ignore
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responseData.headerLines = undefined;
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const binaryData: IBinaryKeyData = {};
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if (responseData.attachments) {
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for (let i = 0; i < responseData.attachments.length; i++) {
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const attachment = responseData.attachments[i];
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binaryData[`${dataPropertyNameDownload}${i}`] = await this.helpers.prepareBinaryData(attachment.content, attachment.filename, attachment.contentType);
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}
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// @ts-ignore
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responseData.attachments = undefined;
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}
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return {
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json: responseData as unknown as IDataObject,
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binary: Object.keys(binaryData).length ? binaryData : undefined,
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} as INodeExecutionData;
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}
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