gosmartkeyboard/Client.md

GoSmartKeyboard Client

When GoSmartKeyboard is started in client mode, it does the following:

1. Load the connection URL from the second CLI argument.
2. Load the auth token from the environment variable KEYBOARD_AUTH or stdin.
3. Connect to the server. 4 Send the auth token to the server.
4. If the server responds with "authenticated", we start reading keys from stdin and sending them to the server until EOF.

Connecting

The base64 authentication token is loaded from the environment variable KEYBOARD_AUTH, if it does not exist we read it from stdin (base64 encoded), ended with a newline.

--- start client

@{load connection URL from second CLI argument}
@{get authTokenInput from environment}

if !authTokenInputExists {
    fmt.Print("Enter authentication token: ")
    _, err := fmt.Scanln(&authTokenInput)
    if err != nil {
        log.Fatal(err)
    }
}

client, _, err := websocket.DefaultDialer.Dial(connectionURL, nil)
if err != nil {
    log.Fatal("dial:", err)
}
defer client.Close()

err = client.WriteMessage(websocket.TextMessage, []byte(authTokenInput))

if err != nil {
    log.Fatal("write:", err)
}

_, authResponse, err := client.ReadMessage()
if err != nil {
    log.Fatal("read:", err)
}
if string(authResponse) != "authenticated" {
    log.Fatal("authentication failed")
}


---

--- load connection URL from second CLI argument --- noWeave

if len(os.Args) < 3 {
    log.Fatal("missing connection URL")
}

connectionURL := os.Args[2]

if !strings.HasPrefix(connectionURL, "ws://") && !strings.HasPrefix(connectionURL, "wss://") {
    log.Fatal("connection URL must start with ws:// or wss://")
}

---

Sending keys

We read keys from stdin and send them to the server until we get EOF

--- start client +=


for {
    var key string
    _, err := fmt.Scanln(&key)
    if err != nil {
        if err == io.EOF {
            break
        }
        log.Fatal(err)
    }
    err = client.WriteMessage(websocket.TextMessage, []byte(key))
    if err != nil {
        log.Fatal("write:", err)
    }
}

---