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  1. 1
      .gitignore
  2. 674
      COPYING
  3. 17
      Makefile
  4. 21
      README.md
  5. 50
      pages/base.html
  6. 21
      pages/index.html
  7. 26
      pages/login.html
  8. 26
      pages/register.html
  9. 96
      scripts/chat.js
  10. 27
      scripts/constants.js
  11. 26
      scripts/sha256.js
  12. 22
      scripts/to_hex_string.js
  13. 112
      scripts/user.js
  14. 81
      src/api/auth.go
  15. 114
      src/api/db.go
  16. 58
      src/api/message.go
  17. 24
      src/api/routes.go
  18. 102
      src/api/user.go
  19. 107
      src/api/websocket.go
  20. 8
      src/go.mod
  21. 4
      src/go.sum
  22. 55
      src/log/log.go
  23. 74
      src/main.go
  24. 32
      src/page/page.go
  25. 126
      src/server/server.go
  26. 128
      src/server/userHandler.go
  27. 89
      src/server/websocketHandler.go
  28. BIN
      static/images/favicon.png
  29. 57
      static/style.css

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COPYING
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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Preamble
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The licenses for most software and other practical works are designed
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

17
Makefile
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BIN_DIR:=bin
SRC_DIR:=src
EXE_NAME:=gochat
PAGES_DIR:=pages
STATIC_DIR:=static
SCRIPTS_DIR:=scripts
all: clean
mkdir $(BIN_DIR)
cd $(SRC_DIR) && go build && mv $(EXE_NAME) ../$(BIN_DIR)
cp -r $(PAGES_DIR) $(BIN_DIR)
cp -r $(STATIC_DIR) $(BIN_DIR)
cp -r $(SCRIPTS_DIR) $(BIN_DIR)
clean:
rm -rf $(BIN_DIR)

21
README.md
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## gochat
### A dead simple real time webchat with authorization using websockets
### Building
`make` or `cd src/ && go build && mv gochat ..`
### Project structure
As you are probably here for reconnaissance reasons for your own project here's a
quick overview of the structure:
- `pages` -> html pages
- `scripts` -> js files where chat.js is the "heavy-lifter" which actually implements the websocket chat logic
- `static` -> icon, stylesheet for pages
- `src/api` -> the fundament of backend logic, authorization, database and websocket handling,all necessary structs, constants
- `src/log` -> a custom logger
- `src/page` -> a shorcut function for handling html templates
- `src/server` -> the main server struct that glues everything together. For a high-level inspection - refer there
- `src/main.go` -> parse command line flags, set up logging and leave the rest for the server
### License
GPLv3

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pages/base.html
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{{ define "base" }}
<!-- gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. -->
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>gochat</title>
<link rel="shortcut icon" href="/static/images/favicon.png">
<link rel="stylesheet" href="/static/style.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="/scripts/constants.js"></script>
</head>
<body>
<div id="wrapper">
<nav>
<a href="/">main</a>
|
<a href="/register">register</a>
|
<a href="/login">log in</a>
</nav>
<div id="content">
{{ template "content" .}}
</div>
<footer id="error_output"></footer>
</div>
</body>
</html>
{{ end }}

21
pages/index.html
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{{ template "base" . }}
{{ define "content" }}
<p>
logged in as <b id="logged_username" onload=""></b>
</p>
<pre id="chatbox"></pre>
<div>
<input type="text" id="text_input">
<input type="button" value="Send" id="send_button">
<input type="button" value="Disconnect" id="disconnect_button">
</div>
<script src="/scripts/user.js"></script>
<script src="/scripts/chat.js"></script>
{{ end }}

26
pages/login.html
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{{ template "base" . }}
{{ define "content" }}
<h3>Log in</h3>
<form name="auth_form" onsubmit="return false;">
<p>
<label for="username">Username</label> <br>
<input type="text" name="username">
</p>
<p>
<label for="password">Password</label> <br>
<input type="password" name="password">
</p>
<p>
<input type="submit" value="Log in" onmouseup="login()">
</p>
</form>
<script src="/scripts/sha256.js"></script>
<script src="/scripts/user.js"></script>
{{ end }}

26
pages/register.html
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{{ template "base" . }}
{{ define "content" }}
<h3>Register</h3>
<form name="auth_form" onsubmit="return false;">
<p>
<label for="username">Username</label> <br>
<input type="text" name="username" required minlength="3">
</p>
<p>
<label for="password">Password</label> <br>
<input type="password" name="password" required minlength="3">
</p>
<p>
<input type="submit" value="Register" onmouseup="register()">
</p>
</form>
<script src="/scripts/sha256.js"></script>
<script src="/scripts/user.js"></script>
{{ end }}

96
scripts/chat.js
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
let username = localStorage.getItem(LOCALSTORAGE_NAME_KEY);
let secret_hash = localStorage.getItem(LOCALSTORAGE_PASSWORD_HASH_KEY);
// check whether credentials are right or not
areCredentialsValid({username:username, secret_hash:secret_hash})
.then(valid => {
if (valid === true) {
// they are valid, connect as a websocket
document.getElementById("logged_username").innerHTML = username;
let socket = new WebSocket(`ws://${BACKEND_URL}/${API_WEBSOCKET_ENDPOINT}`);
// send auth data right away, as API tells us to do
socket.onopen = event => {
console.log("Connected to the server");
let auth_data = JSON.stringify({
username: username,
secret_hash: secret_hash,
});
socket.send(auth_data);
}
socket.onclose = event => {
console.log("Closed connection: ", event);
socket.close();
let chatbox = document.getElementById("chatbox");
chatbox.innerHTML += "Connection closed";
chatbox.scrollTop = chatbox.scrollHeight;
};
// display it
socket.onmessage = event => {
let message = JSON.parse(event.data);
let from_user = message.from.username;
let constructed_message_to_display = `${from_user}: ${message.contents}` + "\n";
let chatbox = document.getElementById("chatbox");
chatbox.innerHTML += constructed_message_to_display;
chatbox.scrollTop = chatbox.scrollHeight;
}
// make buttons do intended
let send_button = document.getElementById("send_button");
send_button.addEventListener("click", (event) => {
let text_input = document.getElementById("text_input");
socket.send(
JSON.stringify({
contents: String(text_input.value),
}));
text_input.value = "";
text_input.focus();
});
let disconnect_button = document.getElementById("disconnect_button");
disconnect_button.addEventListener("click", (event) => {
socket.close();
disconnect_button.value = "Reconnect";
disconnect_button.addEventListener("click", (event) => {
location.reload();
})
})
// make message to be sent via pressing 'Enter' key
document.addEventListener("keypress", (event) => {
if (event.key == "Enter") {
send_button.click();
}
})
// and focus the text input so the user does not have to click it manually
document.getElementById("text_input").focus();
} else {
// credentials are not valid ! To the registration page you go
window.location.replace("/register");
}
})

27
scripts/constants.js
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
const API_BASE_ENDPOINT = "api";
const API_USER_ENDPOINT = "api/user"
const API_WEBSOCKET_ENDPOINT = "api/ws";
const AUTH_HEADER_KEY = "AUTH_INFO";
const AUTH_SEPARATOR = ":"
const LOCALSTORAGE_NAME_KEY = "username";
const LOCALSTORAGE_PASSWORD_HASH_KEY = "secret_hash";
const BACKEND_URL = window.location.host;

26
scripts/sha256.js
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
function sha256(string) {
const encoded_string = new TextEncoder().encode(string);
return crypto.subtle.digest('SHA-256', encoded_string).then((hash_sum) => {
const hashArray = Array.from(new Uint8Array(hash_sum));
const hashHex = hashArray
.map((bytes) => bytes.toString(16).padStart(2, '0'))
.join('');
return hashHex;
});
}

22
scripts/to_hex_string.js
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
function to_hex_string(byteArr) {
return Array.from(byteArr, function(byte) {
return ('0' + (byte & 0xFF).toString(16).slice(-2));
}).join('')
}

112
scripts/user.js
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
async function register() {
let auth_form = document.forms["auth_form"];
let username = String(auth_form.elements["username"].value).trim();
if (username.length < 3) {
document.getElementById("error_output").innerHTML = "Username must be >= 3 characters long";
return;
}
let password = String(auth_form.elements["password"].value).trim();
if (password.length < 3) {
document.getElementById("error_output").innerHTML = "Password must be >= 3 characters long";
return;
}
sha256(password).then((password_sha256) => {
let post_data = {
username: username,
secret_hash: password_sha256,
};
fetch(API_USER_ENDPOINT, {
method: "POST",
headers: {"Content-Type": "application/json"},
body: JSON.stringify(post_data),
})
.then(response => {
if (response.status == 200) {
localStorage.setItem(LOCALSTORAGE_NAME_KEY, username);
localStorage.setItem(LOCALSTORAGE_PASSWORD_HASH_KEY, password_sha256);
window.location.replace("/")
}
})
.catch((error) => {
document.getElementById("error_output").innerHTML = error;
});
});
};
async function areCredentialsValid(user_credentials) {
let valid = false;
await fetch(API_USER_ENDPOINT, {
method: "GET",
headers: {"AUTH_INFO": user_credentials.username+":"+user_credentials.secret_hash},
})
.then(response => {
return response.text();
})
.then(response_data => {
let response = JSON.parse(response_data)
console.log(response);
if (response.valid === true) {
valid = true;
} else {
valid = false;
}
});
return valid;
}
async function login() {
let auth_form = document.forms["auth_form"];
let username = String(auth_form.elements["username"].value).trim();
if (username.length < 3) {
document.getElementById("error_output").innerHTML = "Username must be >= 3 characters long";
return;
}
let password = String(auth_form.elements["password"].value).trim();
if (password.length < 3) {
document.getElementById("error_output").innerHTML = "Password must be >= 3 characters long";
return;
}
await sha256(password).then((password_sha256) => {
let user_credentials = {
"username": username,
"secret_hash": password_sha256,
};
areCredentialsValid(user_credentials)
.then(valid => {
if (valid === true) {
localStorage.setItem(LOCALSTORAGE_NAME_KEY, username);
localStorage.setItem(LOCALSTORAGE_PASSWORD_HASH_KEY, password_sha256);
window.location.replace("/");
} else {
document.getElementById("error_output").innerHTML = "Invalid credentials";
}
})
});
}

81
src/api/auth.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package api
import (
"fmt"
"net/http"
"strings"
)
const (
AuthHeaderKey string = "AUTH_INFO"
AuthSeparator string = ":"
)
var ErrNotAuthorized error = fmt.Errorf("not authorized")
// Extract information about the sender from request headers.
// If no data is given or just wrong - returns a default user struct
func GetUserAuthHeaderData(req *http.Request) User {
authData := req.Header.Get(AuthHeaderKey)
dividedAuthData := strings.Split(authData, AuthSeparator)
if len(dividedAuthData) != 2 {
return User{}
}
username, passHash := dividedAuthData[0], dividedAuthData[1]
return User{
Name: username,
SecretHash: passHash,
}
}
// Checks whether provided request indeed contains SOME authentication information.
// Does not check it for being legitimate or not
func WithAuth(req *http.Request) bool {
authenticationData := req.Header.Get(AuthHeaderKey)
if authenticationData == "" || len(authenticationData) < 3 {
return false
}
return true
}
// Checks whether request contains valid and real user authorization data that is in the database
func (db *DB) IsValidAuth(req *http.Request) bool {
if !WithAuth(req) {
return false
}
headerUser := GetUserAuthHeaderData(req)
if !db.DoesUserExist(headerUser.Name) {
return false
}
userDB, err := db.GetUser(headerUser.Name)
if err != nil {
return false
}
if userDB.SecretHash != headerUser.SecretHash {
return false
}
return true
}

114
src/api/db.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package api
import (
"database/sql"
"fmt"
"os"
_ "github.com/mattn/go-sqlite3"
)
const (
UsersTablename string = "users"
// MessagesTablename string = "messages"
)
// SQL database wrapper
type DB struct {
*sql.DB
}
// Closes database connection
func (db *DB) ShutDown() {
db.Close()
}
func (db *DB) createUsersTable() error {
command := fmt.Sprintf(
`CREATE TABLE IF NOT EXISTS %s
(username TEXT NOT NULL PRIMARY KEY, secret_hash TEXT NOT NULL)`, UsersTablename)
_, err := db.Exec(command)
if err != nil {
return err
}
return nil
}
// func (db *DB) createMessagesTable() error {
// command := fmt.Sprintf(
// `CREATE TABLE IF NOT EXISTS %s
// (id INTEGER NOT NULL PRIMARY KEY, content TEXT NOT NULL,
// from_name TEXT NOT NULL, FOREIGN KEY(from_name) REFERENCES %s(username))`,
// MessagesTablename, UsersTablename,
// )
// _, err := db.Exec(command)
// if err != nil {
// return err
// }
// return nil
// }
func (db *DB) setUpTables() error {
err := db.createUsersTable()
if err != nil {
return fmt.Errorf("error creating users table: %s", err)
}
return nil
}
// Creates a database if does not exist
func CreateDB(path string) error {
dbFile, err := os.OpenFile(path, os.O_CREATE|os.O_RDWR, os.ModePerm)
if err != nil {
return err
}
dbFile.Close()
sqlDB, err := sql.Open("sqlite3", path)
if err != nil {
return err
}
db := DB{
sqlDB,
}
err = db.setUpTables()
if err != nil {
return fmt.Errorf("could not set up tables: %s", err)
}
return nil
}
// Opens a DB
func OpenDB(path string) (*DB, error) {
sqlDB, err := sql.Open("sqlite3", path)
if err != nil {
return nil, err
}
db := DB{
sqlDB,
}
return &db, nil
}

58
src/api/message.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package api
// A message struct that is converted back and forth to JSON in order to communicate with frontend
type Message struct {
TimeStamp uint64 `json:"timestamp"`
From User `json:"from"`
Contents string `json:"contents"`
}
/* PROBABLY come back later and implement a message-remembering feature */
// func (db *DB) AddMessage(message Message) error {
// command := fmt.Sprintf("INSERT INTO %s(from, contents) VALUES(%s, %s)", MessagesTablename, message.From.Name, message.Contents)
// _, err := db.Exec(command)
// if err != nil {
// return err
// }
// return nil
// }
// func (db *DB) GetAllMessages() (*[]Message, error) {
// command := fmt.Sprintf("SELECT * FROM %s", MessagesTablename)
// rows, err := db.Query(command)
// if err != nil {
// return nil, err
// }
// var messages []Message
// /*
// (id INTEGER NOT NULL PRIMARY KEY, content TEXT NOT NULL,
// to_name TEXT NOT NULL, from_name TEXT NOT NULL, FOREIGN KEY(from_name, to_name) REFERENCES %s(username, username))`,
// */
// for rows.Next() {
// var message Message
// rows.Scan(&message.ID, &message.Contents, message.From.Name)
// messages = append(messages, message)
// }
// return &messages, nil
// }

24
src/api/routes.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package api
const (
RouteBase string = "/api"
RouteUsers string = RouteBase + "/user"
RouteWebsockets string = RouteBase + "/ws"
RouteRooms string = RouteBase + "/room"
)

102
src/api/user.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package api
import (
"fmt"
"unbewohnte.xyz/gochat/log"
)
const HashLength uint = 64
type User struct {
Name string `json:"username"`
SecretHash string `json:"secret_hash"`
Created uint64
}
// Used to declare connection/disconnection messages in chat
var UserSystem User = User{
Name: "System",
SecretHash: "_",
Created: 0,
}
// Get existing user from database by unique name
func (db *DB) GetUser(name string) (User, error) {
command := fmt.Sprintf("SELECT * FROM %s WHERE username=\"%s\"", UsersTablename, name)
result := db.QueryRow(command)
err := result.Err()
if err != nil {
return User{}, err
}
user := User{}
err = result.Scan(&user.Name, &user.SecretHash)
if err != nil {
return User{}, err
}
return user, nil
}
// Create a new user with a unique name
func (db *DB) CreateUser(user *User) error {
command := fmt.Sprintf("INSERT INTO %s (username, secret_hash) VALUES (?, ?)", UsersTablename)
_, err := db.Exec(command, user.Name, user.SecretHash)
if err != nil {
return err
}
log.Info("created user \"%s\"", user.Name)
return nil
}
// Tells if the user already exists in the db
func (db *DB) DoesUserExist(name string) bool {
_, err := db.GetUser(name)
if err != nil {
return false
}
return true
}
// func (db *DB) GetAllUsers() (*[]User, error) {
// command := fmt.Sprintf("SELECT * FROM %s", UsersTablename)
// rows, err := db.Query(command)
// if err != nil {
// return nil, err
// }
// var users []User
// for rows.Next() {
// var user User
// rows.Scan(&user.Name, &user.SecretHash)
// users = append(users, user)
// }
// return &users, nil
// }
// Used to send validation check results for user credentials to frontend
type UserCredentialsValidation struct {
Valid bool `json:"valid"`
}

107
src/api/websocket.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package api
import (
"encoding/json"
"fmt"
"time"
"github.com/gorilla/websocket"
"unbewohnte.xyz/gochat/log"
)
// Websocket connection paired with the owner
type WS struct {
Socket *websocket.Conn
User User
}
// All existing websockets wrapper
type WSHolder struct {
Sockets []*WS
}
// Untrack user's websocket from broadcast
func (holder *WSHolder) Remove(username string) {
var indexToRemove int
for index, socket := range holder.Sockets {
if socket.User.Name == username {
indexToRemove = index
break
}
}
if len(holder.Sockets) >= 2 {
holder.Sockets = append(holder.Sockets[:indexToRemove], holder.Sockets[indexToRemove+1:]...)
} else {
holder.Sockets = append(holder.Sockets[:indexToRemove])
}
}
// Tell the websocket that it is no longer connected
func Disconnect(ws *websocket.Conn) {
ws.WriteControl(websocket.CloseMessage, nil, time.Now().Add(time.Second*1))
ws.Close()
}
// Handle all incoming messages from this websocket, redirecting messages to specified output
func (holder *WSHolder) HandleNewWebSocketMessages(ws *WS, output chan Message) {
for {
msgType, contents, err := ws.Socket.ReadMessage()
if err != nil {
log.Error("could not read message from websocket: %s", err)
Disconnect(ws.Socket)
holder.Remove(ws.User.Name)
disconnectionMessage := Message{
From: UserSystem,
Contents: fmt.Sprintf("%s has disconnected", ws.User.Name),
}
output <- disconnectionMessage
break
}
switch msgType {
case websocket.CloseMessage:
ws.Socket.Close()
holder.Remove(ws.User.Name)
disconnectionMessage := Message{
From: UserSystem,
Contents: fmt.Sprintf("%s has disconnected", ws.User.Name),
}
output <- disconnectionMessage
case websocket.TextMessage:
var newMessage Message
err = json.Unmarshal(contents, &newMessage)
if err != nil {
log.Error("error unmarshaling text message from \"%s\"'s websocket: %s", ws.User.Name, err)
break
}
if len(newMessage.Contents) < 1 {
break
}
newMessage.From = ws.User
output <- newMessage
}
}
}

8
src/go.mod
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module unbewohnte.xyz/gochat
go 1.17
require (
github.com/gorilla/websocket v1.5.0 // indirect
github.com/mattn/go-sqlite3 v1.14.12 // indirect
)

4
src/go.sum
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github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
github.com/mattn/go-sqlite3 v1.14.12 h1:TJ1bhYJPV44phC+IMu1u2K/i5RriLTPe+yc68XDJ1Z0=
github.com/mattn/go-sqlite3 v1.14.12/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=

55
src/log/log.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package log
import (
"io"
"log"
"os"
)
// 3 basic loggers in global space
var (
infoLog *log.Logger
warningLog *log.Logger
errorLog *log.Logger
)
func init() {
infoLog = log.New(os.Stdout, "[INFO] ", log.Ldate|log.Ltime)
warningLog = log.New(os.Stdout, "[WARNING] ", log.Ldate|log.Ltime)
errorLog = log.New(os.Stdout, "[ERROR] ", log.Ldate|log.Ltime|log.Lshortfile)
}
// Set up loggers to write to the given writer
func SetOutput(writer io.Writer) {
infoLog.SetOutput(writer)
warningLog.SetOutput(writer)
errorLog.SetOutput(writer)
}
func Info(format string, a ...interface{}) {
infoLog.Printf(format, a...)
}
func Warning(format string, a ...interface{}) {
warningLog.Printf(format, a...)
}
func Error(format string, a ...interface{}) {
errorLog.Printf(format, a...)
}

74
src/main.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"flag"
"fmt"
"io"
"os"
"path/filepath"
"unbewohnte.xyz/gochat/log"
"unbewohnte.xyz/gochat/server"
)
const version string = "0.1.0"
func main() {
// set up logging
exePath, err := os.Executable()
if err != nil {
log.Error("could not lookup executable's path: %s", err)
}
exeDirPath := filepath.Dir(exePath)
logsDirPath := filepath.Join(exeDirPath, "logs")
err = os.MkdirAll(logsDirPath, os.ModePerm)
if err != nil {
log.Error("could not create logs directory: %s", err)
}
logsFile, err := os.Create(filepath.Join(logsDirPath, "latest.log"))
if err != nil {
log.Error("could not create logs file: %s", err)
}
if err == nil {
log.SetOutput(io.MultiWriter(os.Stdout, logsFile))
} else {
log.SetOutput(os.Stdout)
}
// work out launch flags
var port uint
flag.UintVar(&port, "port", 8080, "Set working port")
flag.Usage = func() {
fmt.Printf("gochat v%s\n\nFlags\nport [uint] -> specify a port number (default: 8080)\n\n(c) Unbewohnte (Kasyanov Nikolay Alexeyevich)\n", version)
}
flag.Parse()
const dbFilename string = "gochat.db"
dbPath := filepath.Join(exeDirPath, dbFilename)
server, err := server.New(exeDirPath, dbPath, port)
if err != nil {
log.Error("could not create a new server instance: %s", err)
}
server.Start()
}

32
src/page/page.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package page
import (
"html/template"
"path/filepath"
)
// Parse files in pagesDir and return a ready-to-render template
func Get(pagesDir string, base string, pagename string) (*template.Template, error) {
page, err := template.ParseFiles(filepath.Join(pagesDir, base), filepath.Join(pagesDir, pagename))
if err != nil {
return nil, err
}
return page, nil
}

126
src/server/server.go
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@ -0,0 +1,126 @@
/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package server
import (
"fmt"
"net/http"
"os"
"path/filepath"
"strings"
"time"
"unbewohnte.xyz/gochat/api"
"unbewohnte.xyz/gochat/log"
"unbewohnte.xyz/gochat/page"
)
// Server structure that glues api logic and http/websocket server together
type Server struct {
workingDir string
http *http.Server
db *api.DB
websockets *api.WSHolder
incomingMessages chan api.Message
}
// Create a new configured and ready-to-launch server
func New(workingDir string, dbPath string, port uint) (*Server, error) {
var server = Server{
workingDir: workingDir,
websockets: &api.WSHolder{},
incomingMessages: make(chan api.Message),
}
err := api.CreateDB(dbPath)
if err != nil {
log.Error("could not create database: %s", err)
os.Exit(1)
}
db, err := api.OpenDB(dbPath)
if err != nil {
log.Error("could not open database: %s", err)
os.Exit(1)
}
server.db = db
// set up routes and handlers
const (
pagesDirName string = "pages"
staticDirName string = "static"
scriptsDirName string = "scripts"
)
pagesDirPath := filepath.Join(workingDir, pagesDirName)
serveMux := http.NewServeMux()
serveMux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir(filepath.Join(workingDir, staticDirName)))))
serveMux.Handle("/scripts/", http.StripPrefix("/scripts/", http.FileServer(http.Dir(filepath.Join(workingDir, scriptsDirName)))))
serveMux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
switch req.URL.Path {
case "/":
requestedPage, err := page.Get(pagesDirPath, "base.html", "index.html")
if err != nil {
log.Error("error getting page on route %s: %s", req.URL.Path, err)
http.Error(w, "internal server error", http.StatusInternalServerError)
}
requestedPage.ExecuteTemplate(w, "index.html", nil)
default:
if strings.HasPrefix(req.URL.Path, api.RouteBase) {
return
}
requestedPage, err := page.Get(pagesDirPath, "base.html", req.URL.Path[1:]+".html")
if err != nil {
log.Error("error getting page on route %s: %s", req.URL.Path, err)
http.Error(w, "internal server error", http.StatusInternalServerError)
}
requestedPage.ExecuteTemplate(w, req.URL.Path[1:]+".html", nil)
}
})
// user api endpoint
serveMux.HandleFunc(api.RouteUsers, server.HandlerUsers)
// ws api endpoint
serveMux.HandleFunc(api.RouteWebsockets, server.HandlerWebsockets)
httpServer := http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: serveMux,
ReadTimeout: time.Second * 5,
WriteTimeout: time.Second * 5,
}
server.http = &httpServer
return &server, nil
}
// Fire up the server
func (s *Server) Start() {
defer s.db.ShutDown()
go s.BroadcastMessages()
// fire up a server
err := s.http.ListenAndServe()
if err != nil {
log.Error("FATAL server error: %s", err)
}
}

128
src/server/userHandler.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package server
import (
"encoding/json"
"io"
"net/http"
"unbewohnte.xyz/gochat/api"
"unbewohnte.xyz/gochat/log"
)
// User creation/credentials validation http handler
func (s *Server) HandlerUsers(w http.ResponseWriter, req *http.Request) {
switch req.Method {
case http.MethodPost:
// unmarshal incoming json
requestBody, err := io.ReadAll(req.Body)
if err != nil {
http.Error(w, "", http.StatusInternalServerError)
return
}
var newUser api.User
err = json.Unmarshal(requestBody, &newUser)
if err != nil {
log.Error("could not unmarshal new user json: %s", err)
http.Error(w, "invalid user json", http.StatusBadRequest)
return
}
// check if this all is genuine
if len(newUser.Name) <= 1 || uint(len(newUser.SecretHash)) != api.HashLength {
log.Error("could not create a new user: incoming name or secret hash is invalid")
http.Error(w, "invalid user json", http.StatusBadRequest)
return
}
if s.db.DoesUserExist(newUser.Name) {
// already have !
http.Error(w, "already exists", http.StatusBadRequest)
return
}
// add user to db
err = s.db.CreateUser(&newUser)
if err != nil {
http.Error(w, "", http.StatusInternalServerError)
log.Error("could not create a new user \"%s\": %s", newUser.Name, err)
return
}
log.Info("successfully created a new user: \"%s\"", newUser.Name)
w.WriteHeader(http.StatusOK)
case http.MethodGet:
// TODO(redo to make it return true or false whether user credentials are okay or not)
headerUserData := api.GetUserAuthHeaderData(req)
if s.db.DoesUserExist(headerUserData.Name) {
response := api.UserCredentialsValidation{}
userDB, _ := s.db.GetUser(headerUserData.Name)
if userDB.SecretHash != headerUserData.SecretHash {
// passwords do not match
response.Valid = false
} else {
response.Valid = true
}
responseBytes, err := json.Marshal(&response)
if err != nil {
log.Error("could not marshal user credentials validation response: %s", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
w.Write(responseBytes)
} else {
// does not even exist
responseBytes, err := json.Marshal(&api.UserCredentialsValidation{
Valid: false,
})
if err != nil {
log.Error("could not marshal user credentials validation response: %s", err)
http.Error(w, "", http.StatusInternalServerError)
return
}
w.Write(responseBytes)
}
// users, err := db.getAllUsers()
// if err != nil {
// http.Error(w, "", http.StatusInternalServerError)
// return
// }
// w.Header().Add("Content-type", "application/json")
// userBytes, err := json.Marshal(*users)
// if err != nil {
// break
// }
// w.Write(userBytes)
default:
http.Error(w, "wrong method", http.StatusMethodNotAllowed)
}
}

89
src/server/websocketHandler.go
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/*
gochat - A dead simple real time webchat.
Copyright (C) 2022 Kasyanov Nikolay Alexeyevich (Unbewohnte)
This file is a part of gochat
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package server
import (
"fmt"
"net/http"
"github.com/gorilla/websocket"
"unbewohnte.xyz/gochat/api"
"unbewohnte.xyz/gochat/log"
)
// Websocket creation handler
func (s *Server) HandlerWebsockets(w http.ResponseWriter, req *http.Request) {
upgrader := websocket.Upgrader{}
socket, err := upgrader.Upgrade(w, req, nil)
if err != nil {
http.Error(w, "could not upgrade to a websocket", http.StatusInternalServerError)
return
}
var authInfo api.User
err = socket.ReadJSON(&authInfo)
if err != nil {
log.Error("%s did not send auth info on websocket connection at all: %s", socket.RemoteAddr(), err)
api.Disconnect(socket)
return
}
if !s.db.DoesUserExist(authInfo.Name) {
log.Error("%s sent an invalid authentication data on websocket: user does not exist", socket.RemoteAddr())
api.Disconnect(socket)
return
}
userDB, _ := s.db.GetUser(authInfo.Name)
if authInfo.SecretHash != userDB.SecretHash {
log.Error("%s did not send valid password hash on websocket", socket.RemoteAddr())
api.Disconnect(socket)
return
}
newWS := api.WS{
Socket: socket,
User: authInfo,
}
// add this new authorized socket to the broadcast
s.websockets.Sockets = append(s.websockets.Sockets, &newWS)
log.Info("A new websocket connection has been established with %s as \"%s\"", newWS.Socket.RemoteAddr(), newWS.User.Name)
go s.websockets.HandleNewWebSocketMessages(&newWS, s.incomingMessages)
newConnectionMessage := api.Message{
From: api.UserSystem,
Contents: fmt.Sprintf("%s has connected", newWS.User.Name),
}
s.incomingMessages <- newConnectionMessage
}
// Send incoming messages from each websocket to all connected ones
func (s *Server) BroadcastMessages() {
for {
message, ok := <-s.incomingMessages
if !ok {
break
}
for _, ws := range s.websockets.Sockets {
ws.Socket.WriteJSON(&message)
}
}
}

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static/images/favicon.png
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57
static/style.css
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@viewport {
width: device-width;
zoom: 1.0;
}
body {
margin: auto;
margin-top: 5ch;
margin-bottom: 10ch;
background-color: #232729;
max-width: 120ch;
padding-left: 2ch;
padding-right: 2ch;
font-size: 1.1em;
word-wrap: break-word;
color: #bbbbbb;
}
a {
text-decoration: none;
color: #bbbbbb;
}
a:hover {
color: azure;
}
nav {
white-space: nowrap;
display: inline-block;
}
#wrapper {
display: flex;
flex-flow: column wrap;
justify-content: center;
row-gap: 3ch;
}
#chatbox {
flex: 1 0 90%;
width: auto;
height: 60ch;
max-width: 80ch;
max-height: 150ch;
overflow-y: scroll;
border: 1px solid #bbbbbb;
}
#error_output {
color: firebrick;
}
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