summaryrefslogtreecommitdiff
path: root/server.js
blob: 80dfabc93505943ad19ab3b8e3be4a45f750ce7c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
const express = require("express");
const mysql = require("mysql");
const bodyParser = require("body-parser");
const https = require("https");
const fs = require("fs");
const api = express();

const rate_limiting = new Set();

const tmwa = {
    status: "OfflineTemporarily",
    num_online: 0,
    timeout: null,
    poll: () => {
        fs.readFile("./online.txt", "utf8", (err, data) => {
            const lines = data.split("\n");

            if (err || lines.length < 2) {
                console.error("encountered an error while retrieving online.txt", err);
                tmwa.timeout = setTimeout(tmwa.poll, 30000); // <= it failed, so check again later
                return;
            }

            const last_online = Date.parse(lines[0].match(/\((.+)\)/)[1] + ` ${process.env.npm_package_config_timezone}`);

            if (Date.now() - last_online < 30000) {
                const num = lines[lines.length - 2].match(/([0-9]+) users are online./);
                tmwa.status = "Online";
                tmwa.num_online = num ? num[1] : 0;
            } else {
                tmwa.status = "OfflineTemporarily";
                tmwa.num_online = 0;
            }

            tmwa.timeout = setTimeout(tmwa.poll, 2000);
        });
    }
};

const checkRateLimiting = (req, res, next) => {
    if (rate_limiting.has(req.ip)) {
        res.status(429).json({
            status: "error",
            error: "too many requests"
        });
    } else {
        next();
    }
    return;
};

const checkCaptcha = (req, res, next) => {
    const token = String(req.get("X-CAPTCHA-TOKEN"));

    if (!token.match(/^[a-zA-Z0-9-_]{8,}$/)) {
        res.status(403).json({
            status: "error",
            error: "no token sent"
        });
        console.info("a request with an empty token was received", req.ip);
        rate_limiting.add(req.ip);
        setTimeout(() => rate_limiting.delete(req.ip), 300000);
        return;
    }

    https.get(`https://www.google.com/recaptcha/api/siteverify?secret=${process.env.npm_package_config_recaptcha_secret}&response=${token}`, re => {
        re.setEncoding("utf8");
        re.on("data", response => {
            const data = JSON.parse(response);
            if (!data.success) {
                console.error(`recaptcha returned an error: ${response}`);
                res.status(403).json({
                    status: "error",
                    error: "captcha validation failed"
                });
                console.info("a request failed to validate", req.ip);
                rate_limiting.add(req.ip);
                setTimeout(() => rate_limiting.delete(req.ip), 300000);
                return;
            }

            next(); // challenge passed, so process the request
        });
    }).on("error", error => {
        console.error(error);
        res.status(403).json({
            status: "error",
            error: "recaptcha couldn't be reached"
        });
        console.warn("reCaptcha couldn't be reached");
        return;
    })
};

api.get("/api/tmwa", (req, res) => {
    res.append("Access-Control-Allow-Origin", "*"); // CORS ready
    res.status(200).json({
        "@context": "http://schema.org",
        "@type": "GameServer",
        name: process.env.npm_package_config_tmwa_name,
        url: process.env.npm_package_config_tmwa_url,
        playersOnline: tmwa.num_online,
        serverStatus: tmwa.status,
    });
});

api.use(checkRateLimiting);
api.use(checkCaptcha);
api.use(bodyParser.json());
api.post("/api/account", (req, res) => {
    if (!req.body || !Reflect.has(req.body, "username") ||
        !Reflect.has(req.body, "password") || !Reflect.has(req.body, "email") ||
        !req.body.username.match(/^[a-zA-Z0-9]{4,23}$/) ||
        !req.body.password.match(/^[a-zA-Z0-9]{4,23}$/) ||
        !req.body.email.match(/^$|^(?:[a-zA-Z0-9.$&+=_~-]{1,34}@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,35}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,34}[a-zA-Z0-9])?){0,9})$/) ||
        req.body.email.length >= 40)
    {
        res.status(400).json({
            status: "error",
            error: "malformed request"
        });
        console.info("a malformed request was received", req.ip, req.body);
        rate_limiting.add(req.ip);
        setTimeout(() => rate_limiting.delete(req.ip), 300000);
        return;
    }

    const account = {
        username: req.body.username,
        password: req.body.password,
        email: req.body.email || "a@a.com"
    };

    const db = mysql.createConnection({
        host     : process.env.npm_package_config_sql_host,
        user     : process.env.npm_package_config_sql_user,
        password : process.env.npm_package_config_sql_password,
        database : process.env.npm_package_config_sql_database
    });

    db.connect(err => {
        if (err) {
            res.status(500).json({
                status: "error",
                error: "couldn't reach the database"
            });
            console.warn("a connection with the database couldn't be established");
            return;
        }

        db.query({sql: `INSERT INTO ${process.env.npm_package_config_sql_table} (USERNAME, PASSWORD, EMAIL, GENDER) VALUES ("${account.username}", "${account.password}", "${account.email}", "N")`}, (err, rows, fields) => {
            if (err) {
                if (err.code === "ER_DUP_ENTRY") {
                    res.status(409).json({
                        status: "error",
                        error: "already exists"
                    });
                    console.info("a request to create an already-existent account was received", req.ip, account.username);
                    rate_limiting.add(req.ip);
                    setTimeout(() => rate_limiting.delete(req.ip), 2000);
                } else {
                    res.status(500).json({
                        status: "error",
                        error: "couldn't add the user"
                    });
                    console.error("an unexpected sql error occured", err);
                }
            } else {
                res.status(201).json({
                    status: "success"
                });
                console.info(`an account was created: ${account.username}`);
                rate_limiting.add(req.ip);
                setTimeout(() => rate_limiting.delete(req.ip), 300000);
            }

            db.end();
        });
    });
});



api.use((req, res, next) => {
    res.status(404).json({
        status: "error",
        error: "unknown endpoint"
    });
    console.info("a request for an unknown endpoint was received", req.ip, req.originalUrl);
});

if (process.env.npm_package_config_port === undefined) {
    console.error("Please run this package with `npm start`");
    process.exit(1);
}

api.set("trust proxy", "loopback"); // only allow localhost to communicate with the API
api.disable("x-powered-by"); // we don't need this header
api.listen(process.env.npm_package_config_port, () => console.info(`Listening on port ${process.env.npm_package_config_port}`));
tmwa.poll();