mirror of
https://github.com/n8n-io/n8n.git
synced 2024-11-10 14:44:05 -08:00
649 lines
19 KiB
TypeScript
649 lines
19 KiB
TypeScript
/* eslint-disable n8n-nodes-base/node-filename-against-convention */
|
||
import type {
|
||
ITriggerFunctions,
|
||
IBinaryData,
|
||
IBinaryKeyData,
|
||
ICredentialDataDecryptedObject,
|
||
ICredentialsDecrypted,
|
||
ICredentialTestFunctions,
|
||
IDataObject,
|
||
INodeCredentialTestResult,
|
||
INodeExecutionData,
|
||
INodeType,
|
||
INodeTypeBaseDescription,
|
||
INodeTypeDescription,
|
||
ITriggerResponse,
|
||
} from 'n8n-workflow';
|
||
import { NodeOperationError } from 'n8n-workflow';
|
||
|
||
import type { ImapSimple, ImapSimpleOptions, Message } from 'imap-simple';
|
||
import { connect as imapConnect, getParts } from 'imap-simple';
|
||
import type { Source as ParserSource } from 'mailparser';
|
||
import { simpleParser } from 'mailparser';
|
||
|
||
import isEmpty from 'lodash/isEmpty';
|
||
import find from 'lodash/find';
|
||
|
||
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;
|
||
}
|
||
|
||
const versionDescription: INodeTypeDescription = {
|
||
displayName: 'Email Trigger (IMAP)',
|
||
name: 'emailReadImap',
|
||
icon: 'fa:inbox',
|
||
group: ['trigger'],
|
||
version: 1,
|
||
description: 'Triggers the workflow when a new email is received',
|
||
eventTriggerDescription: 'Waiting for you to receive an email',
|
||
defaults: {
|
||
name: 'Email Trigger (IMAP)',
|
||
color: '#44AA22',
|
||
},
|
||
triggerPanel: {
|
||
header: '',
|
||
executionsHelp: {
|
||
inactive:
|
||
"<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.",
|
||
active:
|
||
"<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.",
|
||
},
|
||
activationHint:
|
||
"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).",
|
||
},
|
||
// eslint-disable-next-line n8n-nodes-base/node-class-description-inputs-wrong-regular-node
|
||
inputs: [],
|
||
outputs: ['main'],
|
||
credentials: [
|
||
{
|
||
name: 'imap',
|
||
required: true,
|
||
testedBy: 'imapConnectionTest',
|
||
},
|
||
],
|
||
properties: [
|
||
{
|
||
displayName: 'Mailbox Name',
|
||
name: 'mailbox',
|
||
type: 'string',
|
||
default: 'INBOX',
|
||
},
|
||
{
|
||
displayName: 'Action',
|
||
name: 'postProcessAction',
|
||
type: 'options',
|
||
options: [
|
||
{
|
||
name: 'Mark as Read',
|
||
value: 'read',
|
||
},
|
||
{
|
||
name: 'Nothing',
|
||
value: 'nothing',
|
||
},
|
||
],
|
||
default: 'read',
|
||
description:
|
||
'What to do after the email has been received. If "nothing" gets selected it will be processed multiple times.',
|
||
},
|
||
{
|
||
displayName: 'Download Attachments',
|
||
name: 'downloadAttachments',
|
||
type: 'boolean',
|
||
default: false,
|
||
displayOptions: {
|
||
show: {
|
||
format: ['simple'],
|
||
},
|
||
},
|
||
description:
|
||
'Whether attachments of emails should be downloaded. Only set if needed as it increases processing.',
|
||
},
|
||
{
|
||
displayName: 'Format',
|
||
name: 'format',
|
||
type: 'options',
|
||
options: [
|
||
{
|
||
name: 'RAW',
|
||
value: 'raw',
|
||
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',
|
||
},
|
||
{
|
||
name: 'Resolved',
|
||
value: 'resolved',
|
||
description:
|
||
'Returns the full email with all data resolved and attachments saved as binary data',
|
||
},
|
||
{
|
||
name: 'Simple',
|
||
value: 'simple',
|
||
description:
|
||
'Returns the full email; do not use if you wish to gather inline attachments',
|
||
},
|
||
],
|
||
default: 'simple',
|
||
description: 'The format to return the message in',
|
||
},
|
||
{
|
||
displayName: 'Property Prefix Name',
|
||
name: 'dataPropertyAttachmentsPrefixName',
|
||
type: 'string',
|
||
default: 'attachment_',
|
||
displayOptions: {
|
||
show: {
|
||
format: ['resolved'],
|
||
},
|
||
},
|
||
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"',
|
||
},
|
||
{
|
||
displayName: 'Property Prefix Name',
|
||
name: 'dataPropertyAttachmentsPrefixName',
|
||
type: 'string',
|
||
default: 'attachment_',
|
||
displayOptions: {
|
||
show: {
|
||
format: ['simple'],
|
||
downloadAttachments: [true],
|
||
},
|
||
},
|
||
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"',
|
||
},
|
||
{
|
||
displayName: 'Options',
|
||
name: 'options',
|
||
type: 'collection',
|
||
placeholder: 'Add Option',
|
||
default: {},
|
||
options: [
|
||
{
|
||
displayName: 'Custom Email Rules',
|
||
name: 'customEmailConfig',
|
||
type: 'string',
|
||
default: '["UNSEEN"]',
|
||
description:
|
||
'Custom email fetching rules. See <a href="https://github.com/mscdex/node-imap">node-imap</a>\'s search function for more details.',
|
||
},
|
||
{
|
||
displayName: 'Ignore SSL Issues',
|
||
name: 'allowUnauthorizedCerts',
|
||
type: 'boolean',
|
||
default: false,
|
||
description: 'Whether to connect even if SSL certificate validation is not possible',
|
||
},
|
||
{
|
||
displayName: 'Force Reconnect',
|
||
name: 'forceReconnect',
|
||
type: 'number',
|
||
default: 60,
|
||
description: 'Sets an interval (in minutes) to force a reconnection',
|
||
},
|
||
],
|
||
},
|
||
],
|
||
};
|
||
|
||
export class EmailReadImapV1 implements INodeType {
|
||
description: INodeTypeDescription;
|
||
|
||
constructor(baseDescription: INodeTypeBaseDescription) {
|
||
this.description = {
|
||
...baseDescription,
|
||
...versionDescription,
|
||
};
|
||
}
|
||
|
||
methods = {
|
||
credentialTest: {
|
||
async imapConnectionTest(
|
||
this: ICredentialTestFunctions,
|
||
credential: ICredentialsDecrypted,
|
||
): Promise<INodeCredentialTestResult> {
|
||
const credentials = credential.data as ICredentialDataDecryptedObject;
|
||
try {
|
||
const config: ImapSimpleOptions = {
|
||
imap: {
|
||
user: credentials.user as string,
|
||
password: credentials.password as string,
|
||
host: (credentials.host as string).trim(),
|
||
port: credentials.port as number,
|
||
tls: credentials.secure as boolean,
|
||
authTimeout: 20000,
|
||
},
|
||
};
|
||
const tlsOptions: IDataObject = {};
|
||
|
||
if (credentials.secure) {
|
||
tlsOptions.servername = (credentials.host as string).trim();
|
||
}
|
||
if (!isEmpty(tlsOptions)) {
|
||
config.imap.tlsOptions = tlsOptions;
|
||
}
|
||
const conn = imapConnect(config).then(async (entry) => {
|
||
return entry;
|
||
});
|
||
(await conn).getBoxes((_err, _boxes) => {});
|
||
} catch (error) {
|
||
console.log(error);
|
||
return {
|
||
status: 'Error',
|
||
message: error.message,
|
||
};
|
||
}
|
||
return {
|
||
status: 'OK',
|
||
message: 'Connection successful!',
|
||
};
|
||
},
|
||
},
|
||
};
|
||
|
||
async trigger(this: ITriggerFunctions): Promise<ITriggerResponse> {
|
||
const credentials = await this.getCredentials('imap');
|
||
|
||
const mailbox = this.getNodeParameter('mailbox') as string;
|
||
const postProcessAction = this.getNodeParameter('postProcessAction') as string;
|
||
const options = this.getNodeParameter('options', {}) as IDataObject;
|
||
|
||
const staticData = this.getWorkflowStaticData('node');
|
||
this.logger.debug('Loaded static data for node "EmailReadImap"', { staticData });
|
||
|
||
let connection: ImapSimple;
|
||
|
||
// Returns the email text
|
||
|
||
const getText = async (parts: any[], message: Message, subtype: string) => {
|
||
if (!message.attributes.struct) {
|
||
return '';
|
||
}
|
||
|
||
const textParts = parts.filter((part) => {
|
||
return (
|
||
part.type.toUpperCase() === 'TEXT' && part.subtype.toUpperCase() === subtype.toUpperCase()
|
||
);
|
||
});
|
||
|
||
if (textParts.length === 0) {
|
||
return '';
|
||
}
|
||
|
||
try {
|
||
return await connection.getPartData(message, textParts[0]);
|
||
} catch {
|
||
return '';
|
||
}
|
||
};
|
||
|
||
// Returns the email attachments
|
||
const getAttachment = async (
|
||
imapConnection: ImapSimple,
|
||
parts: any[],
|
||
message: Message,
|
||
): Promise<IBinaryData[]> => {
|
||
if (!message.attributes.struct) {
|
||
return [];
|
||
}
|
||
|
||
// Check if the message has attachments and if so get them
|
||
const attachmentParts = parts.filter((part) => {
|
||
return part.disposition && part.disposition.type.toUpperCase() === 'ATTACHMENT';
|
||
});
|
||
|
||
const attachmentPromises = [];
|
||
let attachmentPromise;
|
||
for (const attachmentPart of attachmentParts) {
|
||
attachmentPromise = imapConnection
|
||
.getPartData(message, attachmentPart)
|
||
.then(async (partData) => {
|
||
// Return it in the format n8n expects
|
||
return await this.helpers.prepareBinaryData(
|
||
partData as Buffer,
|
||
attachmentPart.disposition.params.filename as string,
|
||
);
|
||
});
|
||
|
||
attachmentPromises.push(attachmentPromise);
|
||
}
|
||
|
||
return await Promise.all(attachmentPromises);
|
||
};
|
||
|
||
// Returns all the new unseen messages
|
||
const getNewEmails = async (
|
||
imapConnection: ImapSimple,
|
||
searchCriteria: Array<string | string[]>,
|
||
): Promise<INodeExecutionData[]> => {
|
||
const format = this.getNodeParameter('format', 0) as string;
|
||
|
||
let fetchOptions = {};
|
||
|
||
if (format === 'simple' || format === 'raw') {
|
||
fetchOptions = {
|
||
bodies: ['TEXT', 'HEADER'],
|
||
markSeen: false,
|
||
struct: true,
|
||
};
|
||
} else if (format === 'resolved') {
|
||
fetchOptions = {
|
||
bodies: [''],
|
||
markSeen: false,
|
||
struct: true,
|
||
};
|
||
}
|
||
|
||
const results = await imapConnection.search(searchCriteria, fetchOptions);
|
||
|
||
const newEmails: INodeExecutionData[] = [];
|
||
let newEmail: INodeExecutionData, messageHeader, messageBody;
|
||
let attachments: IBinaryData[];
|
||
let propertyName: string;
|
||
|
||
// All properties get by default moved to metadata except the ones
|
||
// which are defined here which get set on the top level.
|
||
const topLevelProperties = ['cc', 'date', 'from', 'subject', 'to'];
|
||
|
||
if (format === 'resolved') {
|
||
const dataPropertyAttachmentsPrefixName = this.getNodeParameter(
|
||
'dataPropertyAttachmentsPrefixName',
|
||
) as string;
|
||
|
||
for (const message of results) {
|
||
if (
|
||
staticData.lastMessageUid !== undefined &&
|
||
message.attributes.uid <= (staticData.lastMessageUid as number)
|
||
) {
|
||
continue;
|
||
}
|
||
if (
|
||
staticData.lastMessageUid === undefined ||
|
||
(staticData.lastMessageUid as number) < message.attributes.uid
|
||
) {
|
||
staticData.lastMessageUid = message.attributes.uid;
|
||
}
|
||
const part = find(message.parts, { which: '' });
|
||
|
||
if (part === undefined) {
|
||
throw new NodeOperationError(this.getNode(), 'Email part could not be parsed.');
|
||
}
|
||
const parsedEmail = await parseRawEmail.call(
|
||
this,
|
||
part.body as Buffer,
|
||
dataPropertyAttachmentsPrefixName,
|
||
);
|
||
|
||
newEmails.push(parsedEmail);
|
||
}
|
||
} else if (format === 'simple') {
|
||
const downloadAttachments = this.getNodeParameter('downloadAttachments') as boolean;
|
||
|
||
let dataPropertyAttachmentsPrefixName = '';
|
||
if (downloadAttachments) {
|
||
dataPropertyAttachmentsPrefixName = this.getNodeParameter(
|
||
'dataPropertyAttachmentsPrefixName',
|
||
) as string;
|
||
}
|
||
|
||
for (const message of results) {
|
||
if (
|
||
staticData.lastMessageUid !== undefined &&
|
||
message.attributes.uid <= (staticData.lastMessageUid as number)
|
||
) {
|
||
continue;
|
||
}
|
||
if (
|
||
staticData.lastMessageUid === undefined ||
|
||
(staticData.lastMessageUid as number) < message.attributes.uid
|
||
) {
|
||
staticData.lastMessageUid = message.attributes.uid;
|
||
}
|
||
const parts = getParts(message.attributes.struct!);
|
||
|
||
newEmail = {
|
||
json: {
|
||
textHtml: await getText(parts, message, 'html'),
|
||
textPlain: await getText(parts, message, 'plain'),
|
||
metadata: {} as IDataObject,
|
||
},
|
||
};
|
||
|
||
messageHeader = message.parts.filter((part) => {
|
||
return part.which === 'HEADER';
|
||
});
|
||
|
||
messageBody = messageHeader[0].body;
|
||
for (propertyName of Object.keys(messageBody as IDataObject)) {
|
||
if (messageBody[propertyName].length) {
|
||
if (topLevelProperties.includes(propertyName)) {
|
||
newEmail.json[propertyName] = messageBody[propertyName][0];
|
||
} else {
|
||
(newEmail.json.metadata as IDataObject)[propertyName] =
|
||
messageBody[propertyName][0];
|
||
}
|
||
}
|
||
}
|
||
|
||
if (downloadAttachments) {
|
||
// Get attachments and add them if any get found
|
||
attachments = await getAttachment(imapConnection, parts, message);
|
||
if (attachments.length) {
|
||
newEmail.binary = {};
|
||
for (let i = 0; i < attachments.length; i++) {
|
||
newEmail.binary[`${dataPropertyAttachmentsPrefixName}${i}`] = attachments[i];
|
||
}
|
||
}
|
||
}
|
||
|
||
newEmails.push(newEmail);
|
||
}
|
||
} else if (format === 'raw') {
|
||
for (const message of results) {
|
||
if (
|
||
staticData.lastMessageUid !== undefined &&
|
||
message.attributes.uid <= (staticData.lastMessageUid as number)
|
||
) {
|
||
continue;
|
||
}
|
||
if (
|
||
staticData.lastMessageUid === undefined ||
|
||
(staticData.lastMessageUid as number) < message.attributes.uid
|
||
) {
|
||
staticData.lastMessageUid = message.attributes.uid;
|
||
}
|
||
const part = find(message.parts, { which: 'TEXT' });
|
||
|
||
if (part === undefined) {
|
||
throw new NodeOperationError(this.getNode(), 'Email part could not be parsed.');
|
||
}
|
||
// Return base64 string
|
||
newEmail = {
|
||
json: {
|
||
raw: part.body,
|
||
},
|
||
};
|
||
|
||
newEmails.push(newEmail);
|
||
}
|
||
}
|
||
|
||
// only mark messages as seen once processing has finished
|
||
if (postProcessAction === 'read') {
|
||
const uidList = results.map((e) => e.attributes.uid);
|
||
if (uidList.length > 0) {
|
||
await imapConnection.addFlags(uidList, '\\SEEN');
|
||
}
|
||
}
|
||
return newEmails;
|
||
};
|
||
|
||
const returnedPromise = await this.helpers.createDeferredPromise();
|
||
|
||
const establishConnection = async (): Promise<ImapSimple> => {
|
||
let searchCriteria = ['UNSEEN'] as Array<string | string[]>;
|
||
if (options.customEmailConfig !== undefined) {
|
||
try {
|
||
searchCriteria = JSON.parse(options.customEmailConfig as string);
|
||
} catch (error) {
|
||
throw new NodeOperationError(this.getNode(), 'Custom email config is not valid JSON.');
|
||
}
|
||
}
|
||
|
||
const config: ImapSimpleOptions = {
|
||
imap: {
|
||
user: credentials.user as string,
|
||
password: credentials.password as string,
|
||
host: (credentials.host as string).trim(),
|
||
port: credentials.port as number,
|
||
tls: credentials.secure as boolean,
|
||
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,
|
||
});
|
||
// 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);
|
||
});
|
||
}
|
||
}
|
||
},
|
||
};
|
||
|
||
const tlsOptions: IDataObject = {};
|
||
|
||
if (options.allowUnauthorizedCerts === true) {
|
||
tlsOptions.rejectUnauthorized = false;
|
||
}
|
||
|
||
if (credentials.secure) {
|
||
tlsOptions.servername = (credentials.host as string).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('error', async (error) => {
|
||
const errorCode = error.code.toUpperCase();
|
||
if (['ECONNRESET', 'EPIPE'].includes(errorCode as string)) {
|
||
this.logger.verbose(`IMAP connection was reset (${errorCode}) - reconnecting.`, {
|
||
error,
|
||
});
|
||
try {
|
||
connection = await establishConnection();
|
||
await connection.openBox(mailbox);
|
||
return;
|
||
} catch (e) {
|
||
this.logger.error('IMAP reconnect did fail', { error: e });
|
||
// If something goes wrong we want to run emitError
|
||
}
|
||
} else {
|
||
this.logger.error('Email Read Imap node encountered a connection error', { error });
|
||
this.emitError(error as Error);
|
||
}
|
||
});
|
||
return conn;
|
||
});
|
||
};
|
||
|
||
connection = await establishConnection();
|
||
|
||
await connection.openBox(mailbox);
|
||
|
||
let reconnectionInterval: NodeJS.Timeout | undefined;
|
||
|
||
if (options.forceReconnect !== undefined) {
|
||
reconnectionInterval = setInterval(
|
||
async () => {
|
||
this.logger.verbose('Forcing reconnection of IMAP node.');
|
||
connection.end();
|
||
connection = await establishConnection();
|
||
await connection.openBox(mailbox);
|
||
},
|
||
(options.forceReconnect as number) * 1000 * 60,
|
||
);
|
||
}
|
||
|
||
// When workflow and so node gets set to inactive close the connectoin
|
||
async function closeFunction() {
|
||
if (reconnectionInterval) {
|
||
clearInterval(reconnectionInterval);
|
||
}
|
||
connection.end();
|
||
}
|
||
|
||
// Resolve returned-promise so that waiting errors can be emitted
|
||
returnedPromise.resolve();
|
||
|
||
return {
|
||
closeFunction,
|
||
};
|
||
}
|
||
}
|