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Parser.js
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Parser.js
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import { decodeEncodedWords, BDecode, BEncode, QPDecode, decodeText } from 'Mime/Encoding';
import { addressparser } from 'Mime/Address';
export function ParseMime(text)
{
class MimePart
{
/*
constructor() {
this.id = 0;
this.start = 0;
this.end = 0;
this.parts = [];
this.bodyStart = 0;
this.bodyEnd = 0;
this.boundary = '';
this.bodyText = '';
// https://datatracker.ietf.org/doc/html/rfc2822#section-3.6
// https://datatracker.ietf.org/doc/html/rfc4021
this.headers = {
// Required
date = null,
from = [], // mailbox-list
// Optional
sender = [], // mailbox MUST occur with multi-address
'reply-to' = [], // address-list
to = [], // address-list
cc = [], // address-list
bcc = [], // address-list
'message-id' = '', // msg-id SHOULD be present
'in-reply-to' = '', // 1*msg-id SHOULD occur in some replies
references = '', // 1*msg-id SHOULD occur in some replies
subject = '', // unstructured
// Optional unlimited
comments = [], // unstructured
keywords = [], // phrase *("," phrase)
// https://datatracker.ietf.org/doc/html/rfc2822#section-3.6.6
'resent-date' = [],
'resent-from' = [],
'resent-sender' = [],
'resent-to' = [],
'resent-cc' = [],
'resent-bcc' = [],
'resent-msg-id' = [],
// https://datatracker.ietf.org/doc/html/rfc2822#section-3.6.7
trace = [],
'return-path' = '', // angle-addr
received = [],
// optional others outside RFC2822
'mime-version' = '', // RFC2045
'content-transfer-encoding' = '',
'content-type' = '',
'delivered-to' = [], // RFC9228 addr-spec
'authentication-results' = '', // dkim, spf, dmarc
'dkim-signature' = '',
'x-rspamd-queue-id' = '',
'x-rspamd-action' = '',
'x-spamd-bar' = '',
'x-rspamd-server' = '',
'x-spamd-result' = '',
'x-remote-address' = '',
// etc.
};
}
*/
header(name) {
return this.headers?.[name];
}
headerValue(name) {
return this.header(name)?.value;
}
get raw() {
return text.slice(this.start, this.end);
}
get bodyRaw() {
return text.slice(this.bodyStart, this.bodyEnd);
}
get body() {
let body = this.bodyRaw,
charset = this.header('content-type')?.params.charset,
encoding = this.headerValue('content-transfer-encoding')?.toLowerCase();
if ('quoted-printable' == encoding) {
body = QPDecode(body);
} else if ('base64' == encoding) {
body = BDecode(body.replace(/\r?\n/g, ''));
}
return decodeText(charset, body);
}
get dataUrl() {
let body = this.bodyRaw,
encoding = this.headerValue('content-transfer-encoding')?.toLowerCase();
if ('base64' == encoding) {
body = body.replace(/\r?\n/g, '');
} else {
if ('quoted-printable' == encoding) {
body = QPDecode(body);
}
body = BEncode(body);
}
return 'data:' + this.headerValue('content-type') + ';base64,' + body;
}
forEach(fn) {
fn(this);
this.parts.forEach(part => part.forEach(fn));
}
getByContentType(type) {
if (type == this.headerValue('content-type')?.toLowerCase()) {
return this;
}
let i = 0, p = this.parts, part;
for (i; i < p.length; ++i) {
if ((part = p[i].getByContentType(type))) {
return part;
}
}
}
}
// mailbox-list or address-list
const lists = ['from','reply-to','to','cc','bcc'];
const ParsePart = (mimePart, start_pos = 0, id = '') =>
{
let part = new MimePart,
head = mimePart.match(/^[\s\S]+?\r?\n\r?\n/)?.[0],
headers = {};
if (id) {
part.id = id;
part.start = start_pos;
part.end = start_pos + mimePart.length;
}
part.parts = [];
// get headers
if (head) {
head.replace(/\r?\n\s+/g, ' ').split(/\r?\n/).forEach(header => {
let match = header.match(/^([^:]+):\s*([^;]+)/),
params = {};
if (match) {
[...header.matchAll(/;\s*([^;=]+)=\s*"?([^;"]+)"?/g)].forEach(param =>
params[param[1].trim().toLowerCase()] = param[2].trim()
);
let field = match[1].trim().toLowerCase();
if (lists.includes(field)) {
match[2] = addressparser(match[2]);
} else if ('keywords' === field) {
match[2] = match[2].split(',').forEach(entry => decodeEncodedWords(entry.trim()));
match[2] = (headers[field]?.value || []).concat(match[2]);
} else {
match[2] = decodeEncodedWords(match[2].trim());
if ('comments' === field) {
match[2] = (headers[field]?.value || []).push(match[2]);
}
}
headers[field] = {
value: match[2],
params: params
};
}
});
// get body
part.bodyStart = start_pos + head.length;
part.bodyEnd = start_pos + mimePart.length;
// get child parts
let boundary = headers['content-type']?.params.boundary;
if (boundary) {
part.boundary = boundary;
let regex = new RegExp('(?:^|\r?\n)--' + RegExp.escape(boundary) + '(?:--)?(?:\r?\n|$)', 'g'),
body = mimePart.slice(head.length),
bodies = body.split(regex),
pos = part.bodyStart;
[...body.matchAll(regex)].forEach(([boundary], index) => {
if (!index) {
// Mostly something like: "This is a multi-part message in MIME format."
part.bodyText = bodies[0];
}
// Not the end?
if ('--' != boundary.trim().slice(-2)) {
pos += bodies[index].length + boundary.length;
part.parts.push(ParsePart(bodies[1+index], pos, ((id ? id + '.' : '') + (1+index))));
}
});
}
part.headers = headers;
}
return part;
};
return ParsePart(text);
}