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valki
235
nodered/rootfs/data/node_modules/mailsplit/lib/mime-node.js
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vendored
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235
nodered/rootfs/data/node_modules/mailsplit/lib/mime-node.js
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'use strict';
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const Headers = require('./headers');
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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 PassThrough = require('stream').PassThrough;
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class MimeNode {
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constructor(parentNode, config) {
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this.type = 'node';
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this.root = !parentNode;
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this.parentNode = parentNode;
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this._parentBoundary = this.parentNode && this.parentNode._boundary;
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this._headersLines = [];
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this._headerlen = 0;
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this._parsedContentType = false;
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this._boundary = false;
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this.multipart = false;
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this.encoding = false;
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this.headers = false;
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this.contentType = false;
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this.flowed = false;
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this.delSp = false;
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this.config = config || {};
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this.libmime = new libmime.Libmime({ Iconv: this.config.Iconv });
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this.parentPartNumber = (parentNode && this.partNr) || [];
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this.partNr = false; // resolved later
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this.childPartNumbers = 0;
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}
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getPartNr(provided) {
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if (provided) {
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return []
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.concat(this.partNr || [])
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.filter(nr => !isNaN(nr))
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.concat(provided);
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}
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let childPartNr = ++this.childPartNumbers;
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return []
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.concat(this.partNr || [])
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.filter(nr => !isNaN(nr))
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.concat(childPartNr);
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}
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addHeaderChunk(line) {
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if (!line) {
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return;
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}
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this._headersLines.push(line);
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this._headerlen += line.length;
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}
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parseHeaders() {
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if (this.headers) {
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return;
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}
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this.headers = new Headers(Buffer.concat(this._headersLines, this._headerlen), this.config);
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this._parsedContentType = this.libmime.parseHeaderValue(this.headers.getFirst('Content-Type'));
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this._parsedContentDisposition = this.libmime.parseHeaderValue(this.headers.getFirst('Content-Disposition'));
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this.encoding = this.headers
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.getFirst('Content-Transfer-Encoding')
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.replace(/\(.*\)/g, '')
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.toLowerCase()
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.trim();
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this.contentType = (this._parsedContentType.value || '').toLowerCase().trim() || false;
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this.charset = this._parsedContentType.params.charset || false;
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this.disposition = (this._parsedContentDisposition.value || '').toLowerCase().trim() || false;
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this.filename = this._parsedContentDisposition.params.filename || this._parsedContentType.params.name || false;
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if (this._parsedContentType.params.format && this._parsedContentType.params.format.toLowerCase().trim() === 'flowed') {
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this.flowed = true;
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if (this._parsedContentType.params.delsp && this._parsedContentType.params.delsp.toLowerCase().trim() === 'yes') {
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this.delSp = true;
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}
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}
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if (this.filename) {
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try {
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this.filename = this.libmime.decodeWords(this.filename);
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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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}
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this.multipart =
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(this.contentType &&
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this.contentType.substr(0, this.contentType.indexOf('/')) === 'multipart' &&
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this.contentType.substr(this.contentType.indexOf('/') + 1)) ||
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false;
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this._boundary = (this._parsedContentType.params.boundary && Buffer.from(this._parsedContentType.params.boundary)) || false;
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this.rfc822 = this.contentType === 'message/rfc822';
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if (!this.parentNode || this.parentNode.rfc822) {
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this.partNr = this.parentNode ? this.parentNode.getPartNr('TEXT') : ['TEXT'];
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} else {
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this.partNr = this.parentNode ? this.parentNode.getPartNr() : [];
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}
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}
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getHeaders() {
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if (!this.headers) {
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this.parseHeaders();
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}
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return this.headers.build();
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}
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setContentType(contentType) {
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if (!this.headers) {
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this.parseHeaders();
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}
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contentType = (contentType || '').toLowerCase().trim();
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if (contentType) {
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this._parsedContentType.value = contentType;
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}
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if (!this.flowed && this._parsedContentType.params.format) {
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delete this._parsedContentType.params.format;
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}
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if (!this.delSp && this._parsedContentType.params.delsp) {
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delete this._parsedContentType.params.delsp;
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}
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this.headers.update('Content-Type', this.libmime.buildHeaderValue(this._parsedContentType));
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}
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setCharset(charset) {
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if (!this.headers) {
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this.parseHeaders();
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}
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charset = (charset || '').toLowerCase().trim();
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if (charset === 'ascii') {
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charset = '';
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}
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if (!charset) {
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if (!this._parsedContentType.value) {
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// nothing to set or update
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return;
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}
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delete this._parsedContentType.params.charset;
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} else {
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this._parsedContentType.params.charset = charset;
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}
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if (!this._parsedContentType.value) {
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this._parsedContentType.value = 'text/plain';
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}
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this.headers.update('Content-Type', this.libmime.buildHeaderValue(this._parsedContentType));
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}
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setFilename(filename) {
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if (!this.headers) {
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this.parseHeaders();
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}
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this.filename = (filename || '').toLowerCase().trim();
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if (this._parsedContentType.params.name) {
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delete this._parsedContentType.params.name;
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this.headers.update('Content-Type', this.libmime.buildHeaderValue(this._parsedContentType));
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}
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if (!this.filename) {
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if (!this._parsedContentDisposition.value) {
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// nothing to set or update
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return;
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}
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delete this._parsedContentDisposition.params.filename;
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} else {
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this._parsedContentDisposition.params.filename = this.filename;
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}
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if (!this._parsedContentDisposition.value) {
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this._parsedContentDisposition.value = 'attachment';
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}
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this.headers.update('Content-Disposition', this.libmime.buildHeaderValue(this._parsedContentDisposition));
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}
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getDecoder() {
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if (!this.headers) {
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this.parseHeaders();
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}
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switch (this.encoding) {
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case 'base64':
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return new libbase64.Decoder();
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case 'quoted-printable':
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return new libqp.Decoder();
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default:
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return new PassThrough();
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}
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}
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getEncoder(encoding) {
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if (!this.headers) {
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this.parseHeaders();
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}
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encoding = (encoding || '')
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.toString()
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.toLowerCase()
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.trim();
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if (encoding && encoding !== this.encoding) {
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this.headers.update('Content-Transfer-Encoding', encoding);
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} else {
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encoding = this.encoding;
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}
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switch (encoding) {
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case 'base64':
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return new libbase64.Encoder();
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case 'quoted-printable':
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return new libqp.Encoder();
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default:
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return new PassThrough();
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}
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}
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}
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module.exports = MimeNode;
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