mirror of
https://github.com/nodemailer/wildduck.git
synced 2025-01-09 09:27:38 +08:00
819 lines
27 KiB
JavaScript
819 lines
27 KiB
JavaScript
'use strict';
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const stream = require('stream');
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const PassThrough = stream.PassThrough;
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const BodyStructure = require('./body-structure');
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const createEnvelope = require('./create-envelope');
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const parseMimeTree = require('./parse-mime-tree');
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const ObjectID = require('mongodb').ObjectID;
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const GridFSBucket = require('mongodb').GridFSBucket;
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const libmime = require('libmime');
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const libqp = require('libqp');
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const libbase64 = require('libbase64');
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const iconv = require('iconv-lite');
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const he = require('he');
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const htmlToText = require('html-to-text');
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const crypto = require('crypto');
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let cryptoAsync;
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try {
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cryptoAsync = require('@ronomon/crypto-async'); // eslint-disable-line global-require
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} catch (E) {
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// ignore
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}
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class Indexer {
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constructor(options) {
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this.options = options || {};
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this.fetchOptions = this.options.fetchOptions || {};
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this.database = this.options.database;
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this.gridfs = this.options.gridfs || this.options.database;
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if (this.gridfs) {
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this.gridstore = new GridFSBucket(this.gridfs, {
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bucketName: 'attachments'
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});
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}
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// create logger
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this.logger = this.options.logger || {
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info: () => false,
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debug: () => false,
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error: () => false
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};
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}
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/**
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* Returns expected size for a node
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*
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* @param {Object} mimeTree Parsed mimeTree object (or sub node)
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* @param {Boolean} textOnly If true, do not include the message header in the response
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* @return {String} Expected message size
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*/
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getSize(mimeTree, textOnly) {
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let size = 0;
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let first = true;
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let root = true;
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// make sure that mixed body + mime gets rebuilt correctly
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let append = (data, force) => {
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if (Array.isArray(data)) {
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data = data.join('\r\n');
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}
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if (data || force) {
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size += Buffer.byteLength((first ? '' : '\r\n') + (data || ''), 'binary');
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first = false;
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}
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};
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let walk = (node, next) => {
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if (!textOnly || !root) {
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append(formatHeaders(node.header).join('\r\n') + '\r\n');
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}
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let finalize = () => {
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if (node.boundary) {
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append('--' + node.boundary + '--\r\n');
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}
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append();
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next();
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};
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root = false;
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if (node.size || node.attachmentId) {
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if (!node.boundary) {
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append(false, true); // force newline
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}
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size += node.size;
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}
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if (node.boundary) {
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append('--' + node.boundary);
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}
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if (Array.isArray(node.childNodes)) {
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let pos = 0;
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let processChildNodes = () => {
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if (pos >= node.childNodes.length) {
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return finalize();
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}
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let childNode = node.childNodes[pos++];
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walk(childNode, () => {
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if (pos < node.childNodes.length) {
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append('--' + node.boundary);
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}
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return processChildNodes();
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});
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};
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processChildNodes();
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} else {
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finalize();
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}
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};
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walk(mimeTree, () => false);
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return size;
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}
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/**
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* Builds a parsed mime tree into a rfc822 message
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*
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* @param {Object} mimeTree Parsed mimeTree object
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* @param {Boolean} textOnly If true, do not include the message header in the response
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* @param {Boolean} skipExternal If true, do not include the external nodes
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* @return {Stream} Message stream
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*/
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rebuild(mimeTree, textOnly, skipExternal) {
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let res = new PassThrough();
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let first = true;
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let root = true;
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let remainder = false;
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let aborted = false;
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// make sure that mixed body + mime gets rebuilt correctly
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let append = (data, force) => {
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if (Array.isArray(data)) {
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data = data.join('\r\n');
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}
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if (remainder || data || force) {
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if (!first) {
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res.write('\r\n');
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} else {
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first = false;
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}
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if (remainder && remainder.length) {
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res.write(remainder);
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}
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if (data) {
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res.write(Buffer.from(data, 'binary'));
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}
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}
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remainder = false;
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};
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let walk = (node, next) => {
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if (aborted) {
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return next();
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}
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if (!textOnly || !root) {
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append(formatHeaders(node.header).join('\r\n') + '\r\n');
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}
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root = false;
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if (Buffer.isBuffer(node.body)) {
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// node Buffer
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remainder = node.body;
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} else if (node.body && node.body.buffer) {
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// mongodb Binary
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remainder = node.body.buffer;
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} else if (typeof node.body === 'string') {
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// binary string
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remainder = Buffer.from(node.body, 'binary');
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} else {
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// whatever
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remainder = node.body;
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}
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let finalize = () => {
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if (node.boundary) {
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append('--' + node.boundary + '--\r\n');
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}
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append();
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next();
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};
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if (node.boundary) {
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append('--' + node.boundary);
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} else if (node.attachmentId && !skipExternal) {
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append(false, true); // force newline between header and contents
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let attachmentStream = this.gridstore.openDownloadStream(node.attachmentId);
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attachmentStream.once('error', err => {
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res.emit('error', err);
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});
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attachmentStream.once('end', () => finalize());
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attachmentStream.pipe(res, {
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end: false
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});
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return;
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}
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let pos = 0;
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let processChildNodes = () => {
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if (pos >= node.childNodes.length) {
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return finalize();
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}
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let childNode = node.childNodes[pos++];
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walk(childNode, () => {
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if (aborted) {
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return next();
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}
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if (pos < node.childNodes.length) {
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append('--' + node.boundary);
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}
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setImmediate(processChildNodes);
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});
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};
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if (Array.isArray(node.childNodes)) {
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processChildNodes();
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} else {
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finalize();
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}
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};
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setImmediate(
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walk.bind(null, mimeTree, () => {
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res.end();
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})
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);
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// if called then stops resolving rest of the message
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res.abort = () => {
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aborted = true;
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};
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return {
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type: 'stream',
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value: res,
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expectedLength: this.getSize(mimeTree, textOnly)
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};
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}
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/**
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* Parses structured MIME tree from a rfc822 message source
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*
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* @param {String|Buffer} rfc822 E-mail message as 'binary'-string or Buffer
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* @return {Object} Parsed mime tree
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*/
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parseMimeTree(rfc822) {
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return parseMimeTree(rfc822);
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}
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/**
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* Decode text/plain and text/html parts, separate node bodies from the tree
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*/
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getMaildata(messageId, mimeTree) {
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let magic = parseInt(crypto.randomBytes(2).toString('hex'), 16);
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let map = {};
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let maildata = {
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nodes: [],
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attachments: [],
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text: '',
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html: [],
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// magic number to append to increment stored attachment object counter
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magic,
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// match ids referenced in document to actual attachment ids
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map
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};
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let idcount = 0;
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let htmlContent = [];
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let textContent = [];
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let cidMap = new Map();
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let walk = (node, alternative, related) => {
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let flowed = false;
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let delSp = false;
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let parsedContentType = node.parsedHeader['content-type'];
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let parsedDisposition = node.parsedHeader['content-disposition'];
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let transferEncoding = (node.parsedHeader['content-transfer-encoding'] || '7bit').toLowerCase().trim();
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let contentType = ((parsedContentType && parsedContentType.value) || (node.rootNode ? 'text/plain' : 'application/octet-stream'))
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.toLowerCase()
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.trim();
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alternative = alternative || contentType === 'multipart/alternative';
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related = related || contentType === 'multipart/related';
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if (parsedContentType && parsedContentType.params.format && parsedContentType.params.format.toLowerCase().trim() === 'flowed') {
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flowed = true;
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if (parsedContentType.params.delsp && parsedContentType.params.delsp.toLowerCase().trim() === 'yes') {
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delSp = true;
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}
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}
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let disposition = ((parsedDisposition && parsedDisposition.value) || '').toLowerCase().trim() || false;
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let isInlineText = false;
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let isMultipart = contentType.split('/')[0] === 'multipart';
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// If the current node is HTML or Plaintext then allow larger content included in the mime tree
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// Also decode text/html value
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if (
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['text/plain', 'text/html', 'text/rfc822-headers', 'message/delivery-status'].includes(contentType) &&
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(!disposition || disposition === 'inline')
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) {
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isInlineText = true;
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if (node.body && node.body.length) {
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let charset = parsedContentType.params.charset || 'windows-1257';
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let content = node.body;
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if (transferEncoding === 'base64') {
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content = libbase64.decode(content.toString());
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} else if (transferEncoding === 'quoted-printable') {
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content = libqp.decode(content.toString());
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}
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if (!['ascii', 'usascii', 'utf8'].includes(charset.replace(/[^a-z0-9]+/g, '').trim().toLowerCase())) {
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try {
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content = iconv.decode(content, charset);
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} catch (E) {
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// do not decode charset
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}
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}
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if (flowed) {
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content = libmime.decodeFlowed(content.toString(), delSp);
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} else {
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content = content.toString();
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}
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if (contentType === 'text/html') {
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htmlContent.push(content.trim());
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if (!alternative) {
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try {
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let text = htmlToText.fromString(content);
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textContent.push(text.trim());
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} catch (E) {
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// ignore
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}
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}
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} else {
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textContent.push(content.trim());
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if (!alternative) {
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htmlContent.push(textToHtml(content));
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}
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}
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}
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}
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// remove attachments and very large text nodes from the mime tree
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if (!isMultipart && node.body && node.body.length && (!isInlineText || node.size > 300 * 1024)) {
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let attachmentId = 'ATT' + leftPad(++idcount, '0', 5);
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map[attachmentId] = new ObjectID();
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let fileName =
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(node.parsedHeader['content-disposition'] &&
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node.parsedHeader['content-disposition'].params &&
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node.parsedHeader['content-disposition'].params.filename) ||
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(node.parsedHeader['content-type'] && node.parsedHeader['content-type'].params && node.parsedHeader['content-type'].params.name) ||
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false;
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let contentId = (node.parsedHeader['content-id'] || '').toString().replace(/<|>/g, '').trim();
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if (fileName) {
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try {
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fileName = libmime.decodeWords(fileName).trim();
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} catch (E) {
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// failed to parse filename, keep as is (most probably an unknown charset is used)
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}
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} else {
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fileName = crypto.randomBytes(4).toString('hex') + '.' + libmime.detectExtension(contentType);
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}
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cidMap.set(contentId, {
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id: attachmentId,
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fileName
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});
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// push to queue
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maildata.nodes.push({
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attachmentId,
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options: {
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fsync: true,
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contentType,
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// metadata should include only minimally required information, this would allow
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// to share attachments between different messages if the content is exactly the same
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// even though metadata (filename, content-disposition etc) might not
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metadata: {
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// values to detect if there are messages that reference to this attachment or not
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m: maildata.magic,
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c: 1,
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// how to decode contents if a webclient or API asks for the attachment
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transferEncoding
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}
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},
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body: node.body
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});
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// do not include text content, multipart elements and embedded messages in the attachment list
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if (!isInlineText && !(contentType === 'message/rfc822' && (!disposition || disposition === 'inline'))) {
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// list in the attachments array
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maildata.attachments.push({
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id: attachmentId,
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fileName,
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contentType,
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disposition,
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transferEncoding,
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related,
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// approximite size in kilobytes
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sizeKb: Math.ceil((transferEncoding === 'base64' ? this.expectedB64Size(node.size) : node.size) / 1024)
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});
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}
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node.body = false;
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node.attachmentId = attachmentId;
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}
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// message/rfc822
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if (node.message) {
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node = node.message;
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}
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if (Array.isArray(node.childNodes)) {
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node.childNodes.forEach(childNode => {
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walk(childNode, alternative, related);
|
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});
|
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}
|
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};
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walk(mimeTree, false, false);
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let updateCidLinks = str =>
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str.replace(/\bcid:([^\s"']+)/g, (match, cid) => {
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if (cidMap.has(cid)) {
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let attachment = cidMap.get(cid);
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return 'attachment:' + messageId + '/' + attachment.id.toString();
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}
|
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return match;
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});
|
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maildata.html = htmlContent.filter(str => str.trim()).map(updateCidLinks);
|
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maildata.text = textContent.filter(str => str.trim()).map(updateCidLinks).join('\n').trim();
|
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return maildata;
|
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}
|
||
|
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/**
|
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* Stores attachments to GridStore
|
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*/
|
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storeNodeBodies(messageId, maildata, mimeTree, callback) {
|
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let pos = 0;
|
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let nodes = maildata.nodes;
|
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let storeNode = () => {
|
||
if (pos >= nodes.length) {
|
||
// replace attachment IDs with ObjectIDs in the mimeTree
|
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let walk = (node, next) => {
|
||
if (node.attachmentId && maildata.map[node.attachmentId]) {
|
||
node.attachmentId = maildata.map[node.attachmentId];
|
||
}
|
||
|
||
if (Array.isArray(node.childNodes)) {
|
||
let pos = 0;
|
||
let processChildNodes = () => {
|
||
if (pos >= node.childNodes.length) {
|
||
return next();
|
||
}
|
||
let childNode = node.childNodes[pos++];
|
||
walk(childNode, () => processChildNodes());
|
||
};
|
||
processChildNodes();
|
||
} else {
|
||
next();
|
||
}
|
||
};
|
||
|
||
return walk(mimeTree, () => callback(null, true));
|
||
}
|
||
|
||
let node = nodes[pos++];
|
||
|
||
calculateHash(node.body, (err, hash) => {
|
||
if (err) {
|
||
return callback(err);
|
||
}
|
||
|
||
this.gridfs.collection('attachments.files').findOneAndUpdate({
|
||
'metadata.h': hash
|
||
}, {
|
||
$inc: {
|
||
'metadata.c': 1,
|
||
'metadata.m': maildata.magic
|
||
}
|
||
}, {
|
||
returnOriginal: false
|
||
}, (err, result) => {
|
||
if (err) {
|
||
return callback(err);
|
||
}
|
||
|
||
if (result && result.value) {
|
||
maildata.map[node.attachmentId] = result.value._id;
|
||
return storeNode();
|
||
}
|
||
|
||
let returned = false;
|
||
|
||
node.options.metadata.h = hash;
|
||
|
||
let store = this.gridstore.openUploadStreamWithId(maildata.map[node.attachmentId], null, node.options);
|
||
|
||
store.once('error', err => {
|
||
if (returned) {
|
||
return;
|
||
}
|
||
returned = true;
|
||
callback(err);
|
||
});
|
||
|
||
store.once('finish', () => {
|
||
if (returned) {
|
||
return;
|
||
}
|
||
returned = true;
|
||
return storeNode();
|
||
});
|
||
|
||
store.end(node.body);
|
||
});
|
||
});
|
||
};
|
||
|
||
storeNode();
|
||
}
|
||
|
||
expectedB64Size(b64size) {
|
||
b64size = Number(b64size) || 0;
|
||
if (!b64size || b64size <= 0) {
|
||
return 0;
|
||
}
|
||
|
||
let newlines = Math.floor(b64size / 78);
|
||
return Math.ceil((b64size - newlines * 2) / 4 * 3);
|
||
}
|
||
|
||
/**
|
||
* Generates IMAP compatible BODY object from message tree
|
||
*
|
||
* @param {Object} mimeTree Parsed mimeTree object
|
||
* @return {Array} BODY object as a structured Array
|
||
*/
|
||
getBody(mimeTree) {
|
||
// BODY – BODYSTRUCTURE without extension data
|
||
let body = new BodyStructure(mimeTree, {
|
||
upperCaseKeys: true,
|
||
body: true
|
||
});
|
||
|
||
return body.create();
|
||
}
|
||
|
||
/**
|
||
* Generates IMAP compatible BODYSTRUCUTRE object from message tree
|
||
*
|
||
* @param {Object} mimeTree Parsed mimeTree object
|
||
* @return {Array} BODYSTRUCTURE object as a structured Array
|
||
*/
|
||
getBodyStructure(mimeTree) {
|
||
// full BODYSTRUCTURE
|
||
let bodystructure = new BodyStructure(mimeTree, {
|
||
upperCaseKeys: true,
|
||
skipContentLocation: false
|
||
});
|
||
|
||
return bodystructure.create();
|
||
}
|
||
|
||
/**
|
||
* Generates IMAP compatible ENVELOPE object from message headers
|
||
*
|
||
* @param {Object} mimeTree Parsed mimeTree object
|
||
* @return {Array} ENVELOPE object as a structured Array
|
||
*/
|
||
getEnvelope(mimeTree) {
|
||
return createEnvelope(mimeTree.parsedHeader || {});
|
||
}
|
||
|
||
/**
|
||
* Resolves numeric path to a node in the parsed MIME tree
|
||
*
|
||
* @param {Object} mimeTree Parsed mimeTree object
|
||
* @param {String} path Dot-separated numeric path
|
||
* @return {Object} Mime node
|
||
*/
|
||
resolveContentNode(mimeTree, path) {
|
||
if (!mimeTree.childNodes && path === '1') {
|
||
path = '';
|
||
}
|
||
|
||
let pathNumbers = (path || '').toString().split('.');
|
||
let contentNode = mimeTree;
|
||
let pathNumber;
|
||
|
||
while ((pathNumber = pathNumbers.shift())) {
|
||
pathNumber = Number(pathNumber) - 1;
|
||
if (contentNode.message) {
|
||
// redirect to message/rfc822
|
||
contentNode = contentNode.message;
|
||
}
|
||
|
||
if (contentNode.childNodes && contentNode.childNodes[pathNumber]) {
|
||
contentNode = contentNode.childNodes[pathNumber];
|
||
} else {
|
||
return false;
|
||
}
|
||
}
|
||
|
||
return contentNode;
|
||
}
|
||
|
||
bodyQuery(mimeTree, selector, callback) {
|
||
let data = this.getContents(mimeTree, selector);
|
||
|
||
if (data && data.type === 'stream') {
|
||
let sent = false;
|
||
let buffers = [];
|
||
let buflen = 0;
|
||
|
||
data.value.on('readable', () => {
|
||
let buf;
|
||
while ((buf = data.value.read())) {
|
||
buffers.push(buf);
|
||
buflen += buf.length;
|
||
}
|
||
});
|
||
|
||
data.value.on('error', err => {
|
||
if (sent) {
|
||
return;
|
||
}
|
||
sent = true;
|
||
return callback(err);
|
||
});
|
||
|
||
data.value.on('end', () => {
|
||
if (sent) {
|
||
return;
|
||
}
|
||
sent = true;
|
||
return callback(null, Buffer.concat(buffers, buflen));
|
||
});
|
||
} else {
|
||
return setImmediate(() => callback(null, Buffer.from((data || '').toString(), 'binary')));
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Get node contents
|
||
*
|
||
* *selector* is an object with the following properties:
|
||
* * *path* – numeric path 1.2.3
|
||
* * *type* - one of content|header|header.fields|header.fields.not|text|mime
|
||
* * *headers* - an array of headers to include/exclude
|
||
*
|
||
* @param {Object} mimeTree Parsed mimeTree object
|
||
* @param {Object} selector What data to return
|
||
* @param {Boolean} skipExternal If true, do not include the external nodes
|
||
* @return {String} node contents
|
||
*/
|
||
getContents(mimeTree, selector, skipExternal) {
|
||
let node = mimeTree;
|
||
|
||
if (typeof selector === 'string') {
|
||
selector = {
|
||
type: selector
|
||
};
|
||
}
|
||
selector = selector || {
|
||
type: ''
|
||
};
|
||
|
||
if (selector.path) {
|
||
node = this.resolveContentNode(mimeTree, selector.path);
|
||
}
|
||
|
||
if (!node) {
|
||
return '';
|
||
}
|
||
|
||
switch (selector.type) {
|
||
case '':
|
||
case 'content':
|
||
if (!selector.path) {
|
||
// BODY[]
|
||
return this.rebuild(node, false, skipExternal);
|
||
}
|
||
// BODY[1.2.3]
|
||
return this.rebuild(node, true, skipExternal);
|
||
|
||
case 'header':
|
||
if (!selector.path) {
|
||
// BODY[HEADER] mail header
|
||
return formatHeaders(node.header).join('\r\n') + '\r\n\r\n';
|
||
} else if (node.message) {
|
||
// BODY[1.2.3.HEADER] embedded message/rfc822 header
|
||
return (node.message.header || []).join('\r\n') + '\r\n\r\n';
|
||
}
|
||
return '';
|
||
|
||
case 'header.fields': {
|
||
// BODY[HEADER.FIELDS.NOT (Key1 Key2 KeyN)] only selected header keys
|
||
if (!selector.headers || !selector.headers.length) {
|
||
return '\r\n\r\n';
|
||
}
|
||
let headers =
|
||
formatHeaders(node.header)
|
||
.filter(line => {
|
||
let key = line.split(':').shift().toLowerCase().trim();
|
||
return selector.headers.indexOf(key) >= 0;
|
||
})
|
||
.join('\r\n') + '\r\n\r\n';
|
||
return headers;
|
||
}
|
||
case 'header.fields.not': {
|
||
// BODY[HEADER.FIELDS.NOT (Key1 Key2 KeyN)] all but selected header keys
|
||
if (!selector.headers || !selector.headers.length) {
|
||
return formatHeaders(node.header).join('\r\n') + '\r\n\r\n';
|
||
}
|
||
let headers =
|
||
formatHeaders(node.header)
|
||
.filter(line => {
|
||
let key = line.split(':').shift().toLowerCase().trim();
|
||
return selector.headers.indexOf(key) < 0;
|
||
})
|
||
.join('\r\n') + '\r\n\r\n';
|
||
return headers;
|
||
}
|
||
|
||
case 'mime':
|
||
// BODY[1.2.3.MIME] mime node header
|
||
return formatHeaders(node.header).join('\r\n') + '\r\n\r\n';
|
||
|
||
case 'text':
|
||
if (!selector.path) {
|
||
// BODY[TEXT] mail body without headers
|
||
return this.rebuild(node, true, skipExternal);
|
||
} else if (node.message) {
|
||
// BODY[1.2.3.TEXT] embedded message/rfc822 body without headers
|
||
return this.rebuild(node.message, true, skipExternal);
|
||
}
|
||
|
||
return '';
|
||
default:
|
||
return '';
|
||
}
|
||
}
|
||
}
|
||
|
||
function formatHeaders(headers) {
|
||
headers = headers || [];
|
||
if (!Array.isArray(headers)) {
|
||
headers = [].concat(headers || []);
|
||
}
|
||
return headers;
|
||
}
|
||
|
||
function textToHtml(str) {
|
||
let text =
|
||
'<p>' +
|
||
he
|
||
// encode special chars
|
||
.encode(str, {
|
||
useNamedReferences: true
|
||
})
|
||
.replace(/\r?\n/g, '\n')
|
||
.trim() // normalize line endings
|
||
.replace(/[ \t]+$/gm, '')
|
||
.trim() // trim empty line endings
|
||
.replace(/\n\n+/g, '</p><p>')
|
||
.trim() // insert <p> to multiple linebreaks
|
||
.replace(/\n/g, '<br/>') + // insert <br> to single linebreaks
|
||
'</p>';
|
||
|
||
return text;
|
||
}
|
||
|
||
function leftPad(val, chr, len) {
|
||
return chr.repeat(len - val.toString().length) + val;
|
||
}
|
||
|
||
function calculateHash(input, callback) {
|
||
let algo = 'sha256';
|
||
|
||
if (!cryptoAsync) {
|
||
setImmediate(() => callback(null, crypto.createHash(algo).update(input).digest('hex')));
|
||
return;
|
||
}
|
||
|
||
cryptoAsync.hash(algo, input, (err, hash) => {
|
||
if (err) {
|
||
return callback(err);
|
||
}
|
||
return callback(null, hash.toString('hex'));
|
||
});
|
||
}
|
||
|
||
module.exports = Indexer;
|