mirror of
https://github.com/n8n-io/n8n.git
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684 lines
20 KiB
TypeScript
684 lines
20 KiB
TypeScript
/* eslint-disable n8n-nodes-base/node-filename-against-convention */
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import type {
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ITriggerFunctions,
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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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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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JsonObject,
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} from 'n8n-workflow';
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import { NodeOperationError } from 'n8n-workflow';
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import type { ImapSimple, ImapSimpleOptions, Message, MessagePart } from '@n8n/imap';
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import { connect as imapConnect, getParts } from '@n8n/imap';
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import type { Source as ParserSource } from 'mailparser';
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import { simpleParser } from 'mailparser';
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import rfc2047 from 'rfc2047';
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import isEmpty from 'lodash/isEmpty';
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import find from 'lodash/find';
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import type { ICredentialsDataImap } from '../../../credentials/Imap.credentials';
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import { isCredentialsDataImap } from '../../../credentials/Imap.credentials';
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export async function parseRawEmail(
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this: ITriggerFunctions,
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messageEncoded: ParserSource,
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dataPropertyNameDownload: string,
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): Promise<INodeExecutionData> {
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const responseData = await simpleParser(messageEncoded);
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const headers: IDataObject = {};
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const additionalData: 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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additionalData.headers = headers;
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additionalData.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(
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attachment.content,
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attachment.filename,
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attachment.contentType,
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);
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}
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additionalData.attachments = undefined;
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}
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return {
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json: { ...responseData, ...additionalData },
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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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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: 'Email Trigger (IMAP)',
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color: '#44AA22',
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},
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triggerPanel: {
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header: '',
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executionsHelp: {
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inactive:
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"<b>While building your workflow</b>, click the 'listen' button, then send an email to make an event happen. This will trigger an execution, which will show up in this editor.<br /> <br /><b>Once you're happy with your workflow</b>, <a data-key='activate'>activate</a> it. Then every time an email is received, the workflow will execute. These executions will show up in the <a data-key='executions'>executions list</a>, but not in the editor.",
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active:
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"<b>While building your workflow</b>, click the 'listen' button, then send an email to make an event happen. This will trigger an execution, which will show up in this editor.<br /> <br /><b>Your workflow will also execute automatically</b>, since it's activated. Every time an email is received, this node will trigger an execution. These executions will show up in the <a data-key='executions'>executions list</a>, but not in the editor.",
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},
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activationHint:
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"Once you’ve finished building your workflow, <a data-key='activate'>activate</a> it to have it also listen continuously (you just won’t see those executions here).",
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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.trim(),
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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) {
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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.trim();
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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 as 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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this.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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const getText = async (parts: MessagePart[], 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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imapConnection: ImapSimple,
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parts: MessagePart[],
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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(
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(part) => part.disposition?.type?.toUpperCase() === 'ATTACHMENT',
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);
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const decodeFilename = (filename: string) => {
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const regex = /=\?([\w-]+)\?Q\?.*\?=/i;
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if (regex.test(filename)) {
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return rfc2047.decode(filename);
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}
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return filename;
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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 = imapConnection
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.getPartData(message, attachmentPart)
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.then(async (partData) => {
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// if filename contains utf-8 encoded characters, decode it
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const fileName = decodeFilename(
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((attachmentPart.disposition as IDataObject)?.params as IDataObject)
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?.filename as string,
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);
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// Return it in the format n8n expects
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return await this.helpers.prepareBinaryData(Buffer.from(partData), fileName);
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});
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attachmentPromises.push(attachmentPromise);
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}
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return await 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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imapConnection: 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 imapConnection.search(searchCriteria, fetchOptions);
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const newEmails: INodeExecutionData[] = [];
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let newEmail: INodeExecutionData;
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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 as Buffer,
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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) {
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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 as IDataObject[]);
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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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const messageHeader = message.parts.filter((part) => part.which === 'HEADER');
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const messageBody = messageHeader[0].body as Record<string, string[]>;
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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) {
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// Get attachments and add them if any get found
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attachments = await getAttachment(imapConnection, 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 as string,
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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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await imapConnection.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 = await this.helpers.createDeferredPromise();
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const establishConnection = async (): 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) as Array<
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string | string[]
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>;
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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.trim(),
|
||
port: credentials.port,
|
||
tls: credentials.secure,
|
||
authTimeout: 20000,
|
||
},
|
||
onMail: async () => {
|
||
if (connection) {
|
||
if (staticData.lastMessageUid !== undefined) {
|
||
searchCriteria.push(['UID', `${staticData.lastMessageUid as number}:*`]);
|
||
/**
|
||
* A short explanation about UIDs and how they work
|
||
* can be found here: https://dev.to/kehers/imap-new-messages-since-last-check-44gm
|
||
* TL;DR:
|
||
* - You cannot filter using ['UID', 'CURRENT ID + 1:*'] because IMAP
|
||
* won't return correct results if current id + 1 does not yet exist.
|
||
* - UIDs can change but this is not being treated here.
|
||
* If the mailbox is recreated (lets say you remove all emails, remove
|
||
* the mail box and create another with same name, UIDs will change)
|
||
* - You can check if UIDs changed in the above example
|
||
* by checking UIDValidity.
|
||
*/
|
||
this.logger.debug('Querying for new messages on node "EmailReadImap"', {
|
||
searchCriteria,
|
||
});
|
||
}
|
||
|
||
try {
|
||
const returnData = await getNewEmails(connection, searchCriteria);
|
||
if (returnData.length) {
|
||
this.emit([returnData]);
|
||
}
|
||
} catch (error) {
|
||
this.logger.error('Email Read Imap node encountered an error fetching new emails', {
|
||
error: error as Error,
|
||
});
|
||
// Wait with resolving till the returnedPromise got resolved, else n8n will be unhappy
|
||
// if it receives an error before the workflow got activated
|
||
await returnedPromise.promise().then(() => {
|
||
this.emitError(error as Error);
|
||
});
|
||
}
|
||
}
|
||
},
|
||
onUpdate: async (seqNo: number, info) => {
|
||
this.logger.verbose(`Email Read Imap:update ${seqNo}`, info);
|
||
},
|
||
};
|
||
|
||
const tlsOptions: IDataObject = {};
|
||
|
||
if (credentials.allowUnauthorizedCerts) {
|
||
tlsOptions.rejectUnauthorized = false;
|
||
}
|
||
|
||
if (credentials.secure) {
|
||
tlsOptions.servername = credentials.host.trim();
|
||
}
|
||
|
||
if (!isEmpty(tlsOptions)) {
|
||
config.imap.tlsOptions = tlsOptions;
|
||
}
|
||
|
||
// Connect to the IMAP server and open the mailbox
|
||
// that we get informed whenever a new email arrives
|
||
return await imapConnect(config).then(async (conn) => {
|
||
conn.on('close', async (_hadError: boolean) => {
|
||
if (isCurrentlyReconnecting) {
|
||
this.logger.debug('Email Read Imap: Connected closed for forced reconnecting');
|
||
} else if (closeFunctionWasCalled) {
|
||
this.logger.debug('Email Read Imap: Shutting down workflow - connected closed');
|
||
} else {
|
||
this.logger.error('Email Read Imap: Connected closed unexpectedly');
|
||
this.emitError(new Error('Imap connection closed unexpectedly'));
|
||
}
|
||
});
|
||
conn.on('error', async (error) => {
|
||
const errorCode = ((error as JsonObject).code as string).toUpperCase();
|
||
this.logger.verbose(`IMAP connection experienced an error: (${errorCode})`, {
|
||
error: error as Error,
|
||
});
|
||
// eslint-disable-next-line @typescript-eslint/no-use-before-define
|
||
await closeFunction();
|
||
this.emitError(error as Error);
|
||
});
|
||
return conn;
|
||
});
|
||
};
|
||
|
||
connection = await establishConnection();
|
||
|
||
await connection.openBox(mailbox);
|
||
|
||
let reconnectionInterval: NodeJS.Timeout | undefined;
|
||
|
||
const handleReconnect = async () => {
|
||
this.logger.verbose('Forcing reconnect to IMAP server');
|
||
try {
|
||
isCurrentlyReconnecting = true;
|
||
if (connection.closeBox) await connection.closeBox(false);
|
||
connection.end();
|
||
connection = await establishConnection();
|
||
await connection.openBox(mailbox);
|
||
} catch (error) {
|
||
this.logger.error(error as string);
|
||
} finally {
|
||
isCurrentlyReconnecting = false;
|
||
}
|
||
};
|
||
|
||
if (options.forceReconnect !== undefined) {
|
||
reconnectionInterval = setInterval(
|
||
handleReconnect,
|
||
(options.forceReconnect as number) * 1000 * 60,
|
||
);
|
||
}
|
||
|
||
// When workflow and so node gets set to inactive close the connection
|
||
async function closeFunction() {
|
||
closeFunctionWasCalled = true;
|
||
if (reconnectionInterval) {
|
||
clearInterval(reconnectionInterval);
|
||
}
|
||
if (connection.closeBox) await connection.closeBox(false);
|
||
connection.end();
|
||
}
|
||
|
||
// Resolve returned-promise so that waiting errors can be emitted
|
||
returnedPromise.resolve();
|
||
|
||
return {
|
||
closeFunction,
|
||
};
|
||
}
|
||
}
|