GoSmartKeyboard Client

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

Load the connection URL from the first CLI argument.
Load the auth token from the environment variable KEYBOARD_AUTH or stdin if it does not exist.
Connect to the server. 4 Send the auth token to the server.
If the server responds with “authenticated”, we start reading keys from stdin and sending them to the server until EOF.
If KEYBOARD_FIFO is specified as an environment variable, we read from the path specified there instead as a named pipe.

handle client command

if len(os.Args) > 1 {
    @{get client fifo input file from environment} 
    @{setup client}
    if clientFifoInputFileEnvExists {
        @{start client with fifo}
        os.Exit(0)
    }
    @{start client with stdin}
    os.Exit(0)
}

Used by 1

1. 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.

setup client

@{load connection URL from second CLI argument}
@{get authTokenInput from environment}
@{add xdotool if non qwerty function}

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" {
    fmt.Println("authenticated")
} else {
    log.Fatal("authentication failed")
}

Used by 1

2. Sending keys from a named pipe

start client with fifo

var inputString string

syscall.Mkfifo(clientFifoInputFile, syscall.S_IFIFO|0666)

for {
    input, err := ioutil.ReadFile(clientFifoInputFile)
    if err != nil {
        log.Fatal(err)
    }
    inputString = addXDoToolIfNonQWERTY(string(input))
    input = []byte(inputString)
    if len(input) > 0 {
        fmt.Println("send" + strings.Replace(string(input), " ", "space", 10))
        err = client.WriteMessage(websocket.TextMessage, input)
        if err != nil {
            log.Fatal("write:", err)
        }
    }

}

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3. Sending keys from stdin

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

We specify xdotool if the key is not a QWERTY key or if KEYBOARD_ALWAYS_XDOTOOL is set to true.

start client with stdin

reader := bufio.NewReader(os.Stdin)
for {
    var key string
    
    
    rune, _, err := reader.ReadRune() //:= fmt.Scan(&key)
    key = addXDoToolIfNonQWERTY(string(rune))

    if err != nil {
        if err == io.EOF {
            break
        }
        log.Fatal(err)
    }
    fmt.Println("send" + strings.Replace(key, " ", "space", 10))
    err = client.WriteMessage(websocket.TextMessage, []byte(key))
    if err != nil {
        log.Fatal("write:", err)
    }
}

Used by 1

Handling unicode outside of the ASCII set

/client/main-client.go

package main
import (
    "strings"
    "io/ioutil"
    "syscall"
    "io"
    "bufio"
    "log"
    "fmt"
    "os"
@{gorilla/websocket import string}

)

func main(){@{handle client command}}