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// Format of the required matrix.json file:
// {
// "user_id": "@statusbot:tomsmeding.com",
// "password": "PASSWORD OF THE USER",
// "room_id": "!ROOMID:tomsmeding.com"
// }
// Furthermore, accounts.json is required in the standard format ([[user, pass]])
// API:
// POST /statusbot
// { "sender": "who are you", "text": "content of the status message" }
// State in this file: the above matrix.json plus:
// {
// config: the above matrix.json,
// home_server: "tomsmeding.com", // nominal server in the user id
// matrix_server: "matrix.tomsmeding.com", // actual matrix server address, without port
// access_token: "some access token",
// req_counter: 1 // counter for transaction requests to the matrix server
// }
// Saves persist state under key "access_tokens":
// {
// "@statusbot:tomsmeding.com|!ROOMID:tomsmeding.com": ["access token", req_counter: int]
// }
const cmn = require("../$common.js");
const fs = require("fs");
const https = require("https");
const URL = require("url");
const bodyParser = require("body-parser");
let moddir = null;
const persist = require("node-persist").create({
dir: cmn.persistdir + "/statusbot",
continuous: false,
interval: false
});
persist.initSync();
let persistTokens = persist.getItemSync("access_tokens");
if (!persistTokens) {
persistTokens = {};
persist.setItemSync("access_tokens", persistTokens);
}
// cb: (status: int, body: string) => ()
function fetch(method, headers, hostname, path, data, cb) {
const req = https.request({method, headers, hostname, path}, res => {
let body = "";
res.on("data", data => { body += data; });
res.on("end", () => cb(res.statusCode, body));
});
req.on("error", () => cb(null, null))
req.write(data);
req.end();
}
// cb: (state) => ()
function augmentConfig(config, cb) {
const m = config.user_id.match(/^@[^:]+:(.*)$/);
if (!m) {
throw new Error("statusbot: Cannot parse matrix ID (must be in @user:domain format)");
}
const home_server = m[1];
const pkey = `${config.user_id}|${config.room_id}`
let access_token = undefined;
let req_counter = undefined;
if (pkey in persistTokens) {
[access_token, req_counter] = persistTokens[pkey];
}
fetch("GET", {}, home_server, "/.well-known/matrix/server", "", (status, body) => {
if (status != 200) {
throw new Error(`statusbot: Failed getting https://${home_server}/.well-known/matrix/server`);
}
const mserver = JSON.parse(body)["m.server"];
const m = mserver.match(/^([^:]*)(:443)?$/);
if (!m) {
throw new Error(`statusbot: Matrix server port not 443 (sorry): <${mserver}>`);
}
const matrix_server = m[1];
cb({config, home_server, matrix_server, access_token, req_counter});
});
}
function updatePersist(state) {
persistTokens[`${state.config.user_id}|${state.config.room_id}`] = [state.access_token, state.req_counter];
persist.setItemSync("access_tokens", persistTokens);
}
// Sets access token in state.
// cb: (success: bool, body: string) => ()
function matrixLogin(state, cb) {
const data = JSON.stringify({
type: "m.login.password",
identifier: {type: "m.id.user", user: state.config.user_id},
password: state.config.password,
});
fetch("POST", {}, state.matrix_server, "/_matrix/client/v3/login", data, (status, body) => {
if (status != 200) { cb(false, body); return; }
try {
const response = JSON.parse(body);
state.access_token = response.access_token;
state.req_counter = 1;
updatePersist(state);
cb(true, body);
} catch (e) {
cb(false, body);
}
});
}
// cb: (status: int, body: string) => ()
// Status 401: access token invalid
// Status 200: success
// Anything else: ? (see body?)
function matrixSendMsg(state, text, cb) {
if (state.access_token == undefined) { cb(401); return; }
const headers = {Authorization: `Bearer ${state.access_token}`};
const url = `/_matrix/client/v3/rooms/${state.config.room_id}/send/m.room.message/${state.req_counter}`;
state.req_counter++;
updatePersist(state); // req_counter changed
const data = JSON.stringify({
msgtype: "m.text",
body: text,
});
fetch("PUT", headers, state.matrix_server, url, data, (status, body) => {
cb(status, body);
});
}
// cb: () => ()
function logFailure(message, cb) {
fs.appendFile(moddir + "/faillog.txt", `[${new Date().toISOString()}] ${message}\n`, err => {
if (err) console.error(err);
cb();
});
}
// Tries to send a message, trying login if the access token is invalid.
// cb: (success: bool) => ()
function matrixSendMsgLogin(state, text, cb) {
matrixSendMsg(state, text, (status, body) => {
switch (status) {
case 200:
cb(true);
break;
case 401:
matrixLogin(state, (success, body) => {
if (!success) {
logFailure(`Failed to log in: ${body}`, () => cb(false));
return;
}
matrixSendMsg(state, text, (status, body) => {
switch (status) {
case 200: cb(true); return;
case 401: logFailure(`401 even after login: ${body}`, () => cb(false)); break;
default: logFailure(`Failed to send message: ${body}`, () => cb(false)); break;
}
});
});
break;
default:
logFailure(`Failed to send message: ${body}`, () => cb(false));
break;
}
})
}
module.exports = function(app, io, _moddir) {
moddir = _moddir;
const config = require("./matrix.json");
const accounts = require("./accounts.json");
augmentConfig(config, state => {
app.post("/statusbot", bodyParser.json(), cmn.authgen(accounts), (req, res) => {
if (typeof req.body.sender != "string" || typeof req.body.text != "string") {
return res.sendStatus(400);
}
matrixSendMsgLogin(state, `[${req.body.sender}] ${req.body.text}`, success => {
if (success) res.sendStatus(200);
else res.sendStatus(503); // service unavailable
});
});
});
};
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