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// WhatsApp messages -> RFC 5322 (eml) / mboxrd. The base piece for neomutt:
// `--format mbox` opens directly with `neomutt -f`, and a Maildir bridge (like gwsmail)
// only has to write the `--format eml` output to ~/Mail/<account>/<folder>/new.
//
// Conventions (the sending side must follow them):
// addresses the JID as is: 5491122334455@c.us, 1203630...@g.us, 1234@lid
// Message-ID <stanzaId@wa> (stanzaId = the "stanzaId" JSON field)
// In-Reply-To <quotedStanzaId@wa> -> neomutt threads quoted replies
// Reply-To in groups, the group (so `r` answers the group, not privately)
// X-WA-Id serialized ID, for later actions (react, delete, download)
// X-WA-Chat-Id chat it belongs to
import crypto from 'node:crypto';
import { describeContent } from './text.js';
const ASCII = /^[\x20-\x7e]*$/;
function encodedWords(s) {
const words = [];
let chunk = '';
for (const ch of s) {
if (Buffer.byteLength(chunk + ch) > 45) {
words.push(chunk);
chunk = '';
}
chunk += ch;
}
if (chunk) words.push(chunk);
return words.map((w) => `=?UTF-8?B?${Buffer.from(w).toString('base64')}?=`).join('\n ');
}
const headerText = (s) => (ASCII.test(s) ? s : encodedWords(s));
function address(name, addr) {
if (!addr) return 'undisclosed-recipients:;';
if (!name || name === addr.split('@')[0]) return `<${addr}>`;
const display = ASCII.test(name) ? `"${name.replace(/[\\"]/g, '\\$&')}"` : encodedWords(name);
return `${display} <${addr}>`;
}
function rfc2822Date(ts) {
const d = new Date(ts * 1000);
const days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
const p = (n) => String(n).padStart(2, '0');
const off = -d.getTimezoneOffset();
const sign = off >= 0 ? '+' : '-';
return `${days[d.getDay()]}, ${d.getDate()} ${months[d.getMonth()]} ${d.getFullYear()} ` +
`${p(d.getHours())}:${p(d.getMinutes())}:${p(d.getSeconds())} ` +
`${sign}${p(Math.floor(Math.abs(off) / 60))}${p(Math.abs(off) % 60)}`;
}
function quotedPrintable(text) {
const out = [];
for (const line of text.split('\n')) {
const bytes = Buffer.from(line);
let cur = '';
for (let i = 0; i < bytes.length; i++) {
const b = bytes[i];
const last = i === bytes.length - 1;
let tok;
// "From " at the start of a line becomes =46rom: the mbox then needs no escaping
// (and mboxo readers such as mutt do not show ">From").
const fromLine = i === 0 && b === 70 && line.startsWith('From ');
if (!fromLine && ((b >= 33 && b <= 126 && b !== 61) || ((b === 32 || b === 9) && !last))) {
tok = String.fromCharCode(b);
}
if (!tok) tok = `=${b.toString(16).toUpperCase().padStart(2, '0')}`;
if (cur.length + tok.length > 75) {
out.push(`${cur}=`);
cur = '';
}
cur += tok;
}
out.push(cur);
}
return out.join('\n');
}
const base64Lines = (b64) => b64.replace(/\s+/g, '').match(/.{1,76}/g)?.join('\n') ?? '';
function filenameParams(name) {
if (ASCII.test(name)) return `; name="${name.replace(/"/g, '')}"`;
return `; name="${encodedWords(name).replace(/\n /g, '')}"`;
}
function dispositionParams(name) {
if (ASCII.test(name)) return `; filename="${name.replace(/"/g, '')}"`;
return `; filename*=UTF-8''${encodeURIComponent(name)}`;
}
function bodyText(m) {
const lines = [];
const content = describeContent(m);
if (m.hasMedia && !m.media?.data) {
const size = m.media?.size ? `, ${Math.round(m.media.size / 1024)} KB` : '';
lines.push(`[attachment not downloaded: ${m.media?.mimetype ?? m.type}${size}]`);
lines.push(`[wa messages download --params '{"messageId":"${m.id}"}']`);
if (m.body) lines.push('', m.body);
} else {
lines.push(m.hasMedia ? m.body : content);
}
if (m.location) lines.push('', `https://maps.google.com/?q=${m.location.latitude},${m.location.longitude}`);
if (m.links?.length && m.type !== 'chat') lines.push('', ...m.links);
return lines.join('\n');
}
export function messageToEml(m) {
const isGroup = m.chatId?.endsWith('@g.us');
const subject = describeContent(m).split('\n')[0].slice(0, 80) || '(no text)';
const from = address(m.senderName, m.sender);
const to = isGroup ? address(m.chatName, m.chatId) : address(m.fromMe ? m.chatName : null, m.fromMe ? m.chatId : m.to);
const h = [
`From: ${from}`,
`To: ${to}`,
...(isGroup ? [`Reply-To: ${address(m.chatName, m.chatId)}`] : []),
`Subject: ${headerText(subject)}`,
`Date: ${rfc2822Date(m.timestamp)}`,
`Message-ID: <${m.stanzaId}@wa>`,
...(m.quotedStanzaId ? [`In-Reply-To: <${m.quotedStanzaId}@wa>`, `References: <${m.quotedStanzaId}@wa>`] : []),
`X-WA-Id: ${m.id}`,
`X-WA-Chat-Id: ${m.chatId}`,
...(m.chatName ? [`X-WA-Chat-Name: ${headerText(m.chatName)}`] : []),
`X-WA-Type: ${m.type}`,
`X-WA-From-Me: ${m.fromMe ? 'yes' : 'no'}`,
...(m.isForwarded ? ['X-WA-Forwarded: yes'] : []),
'MIME-Version: 1.0',
];
const textPart = [
'Content-Type: text/plain; charset=utf-8',
'Content-Transfer-Encoding: quoted-printable',
'',
quotedPrintable(bodyText(m)),
].join('\n');
const attachments = [];
if (m.media?.data) {
const name = m.media.filename || `${m.stanzaId}`;
const mimetype = (m.media.mimetype || 'application/octet-stream').split(';')[0];
attachments.push([
`Content-Type: ${mimetype}${filenameParams(name)}`,
'Content-Transfer-Encoding: base64',
`Content-Disposition: ${mimetype.startsWith('image/') ? 'inline' : 'attachment'}${dispositionParams(name)}`,
'',
base64Lines(m.media.data),
].join('\n'));
}
(m.vCards || []).forEach((vc, i) => attachments.push([
`Content-Type: text/vcard; charset=utf-8; name="contacto-${i + 1}.vcf"`,
'Content-Transfer-Encoding: quoted-printable',
`Content-Disposition: attachment; filename="contacto-${i + 1}.vcf"`,
'',
quotedPrintable(vc.replace(/\r\n/g, '\n')),
].join('\n')));
if (!attachments.length) return `${h.join('\n')}\n${textPart}\n`;
const boundary = `wa-${crypto.randomBytes(12).toString('hex')}`;
return [
...h,
`Content-Type: multipart/mixed; boundary="${boundary}"`,
'',
...[textPart, ...attachments].map((part) => `--${boundary}\n${part}`),
`--${boundary}--`,
'',
].join('\n');
}
function asMessages(data) {
const list = Array.isArray(data) ? data : [data];
if (!list.every((m) => m && typeof m === 'object' && 'stanzaId' in m)) {
throw Object.assign(new Error('the eml/mbox formats only apply to messages'), { code: 'EINVAL' });
}
return list;
}
export function toEml(data
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