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package browsh
import (
"encoding/json"
"fmt"
"net/http"
"strings"
"github.com/go-errors/errors"
"github.com/gorilla/websocket"
"github.com/spf13/viper"
)
var (
upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool { return true },
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
stdinChannel = make(chan string)
IsConnectedToWebExtension = false
)
type incomingRawText struct {
RequestID string `json:"request_id"`
RawJSON string `json:"json"`
}
func startWebSocketServer() {
serverMux := http.NewServeMux()
serverMux.HandleFunc("/", webSocketServer)
port := viper.GetString("browsh.websocket-port")
Log("Starting websocket server...")
if netErr := http.ListenAndServe(":"+port, serverMux); netErr != nil {
Shutdown(errors.New(fmt.Errorf("Error starting websocket server: %v", netErr)))
}
}
func sendMessageToWebExtension(message string) {
if !IsConnectedToWebExtension {
Log("Webextension not connected. Message not sent: " + message)
return
}
stdinChannel <- message
}
// Listen to all messages coming from the webextension
// TODO: It seems this *also* receives sent to the webextention!?
func webSocketReader(ws *websocket.Conn) {
defer ws.Close()
for {
_, message, err := ws.ReadMessage()
handleWebextensionCommand(message)
if err != nil {
if websocket.IsCloseError(err, websocket.CloseGoingAway) {
Log("Socket reader detected that the browser closed the websocket")
triggerSocketWriterClose()
return
}
if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway) {
Log("Socket reader detected that the connection unexpectedly dissapeared")
triggerSocketWriterClose()
return
}
Shutdown(err)
}
}
}
func handleWebextensionCommand(message []byte) {
parts := strings.Split(string(message), ",")
command := parts[0]
if viper.GetBool("http-server-mode") {
handleRawFrameTextCommands(parts)
return
}
switch command {
case "/frame_text":
parseJSONFrameText(strings.Join(parts[1:], ","))
renderCurrentTabWindow()
case "/frame_pixels":
parseJSONFramePixels(strings.Join(parts[1:], ","))
renderCurrentTabWindow()
case "/tab_state":
parseJSONTabState(strings.Join(parts[1:], ","))
if CurrentTab != nil {
renderUI()
}
case "/screenshot":
saveScreenshot(parts[1])
default:
Log("WEBEXT: " + string(message))
}
}
func handleRawFrameTextCommands(parts []string) {
var incoming incomingRawText
command := parts[0]
if command == "/raw_text" {
jsonBytes := []byte(strings.Join(parts[1:], ","))
if err := json.Unmarshal(jsonBytes, &incoming); err != nil {
Shutdown(err)
}
if incoming.RequestID != "" {
Log("Raw text for " + incoming.RequestID)
rawTextRequests.store(incoming.RequestID, incoming.RawJSON)
} else {
Log("Raw text but no associated request ID")
}
} else {
Log("WEBEXT: " + strings.Join(parts[0:], ","))
}
}
// When the socket reader attempts to read from a closed websocket it quickly and
// simply closes its associated Go routine. However the socket writer won't
// automatically notice until it actually needs to send something. So we force that
// by sending this NOOP text.
// TODO: There's a potential race condition because new connections share the same
// Go channel. So we need to setup a new channel for every connection.
func triggerSocketWriterClose() {
stdinChannel <- "BROWSH CLIENT FORCING CLOSE OF WEBSOCKET WRITER"
}
// Send a message to the webextension
func webSocketWriter(ws *websocket.Conn) {
var message string
defer ws.Close()
for {
message = <-stdinChannel
Log(fmt.Sprintf("TTY sending: %s", message))
if err := ws.WriteMessage(websocket.TextMessage, []byte(message)); err != nil {
if err == websocket.ErrCloseSent {
Log("Socket writer detected that the browser closed the websocket")
} else {
Log("Socket writer detected unexpected closure of websocket")
}
return
}
}
}
func webSocketServer(w http.ResponseWriter, r *http.Request) {
Log("Incoming web request from browser")
ws, err := upgrader.Upgrade(w, r, nil)
if err != nil {
Shutdown(err)
}
IsConnectedToWebExtension = true
go webSocketWriter(ws)
go webSocketReader(ws)
sendConfigToWebExtension()
setDefaultFirefoxPreferences()
if !viper.GetBool("http-server-mode") {
sendTtySize()
}
// For some reason, using Firefox's CLI arg `--url https://google.com` doesn't consistently
// work. So we do it here instead.
validURL := viper.GetStringSlice("validURL")
if len(validURL) == 0 {
if !IsHTTPServerMode {
sendMessageToWebExtension("/new_tab," + viper.GetString("startup-url"))
}
} else {
for i := 0; i < len(validURL); i++ {
sendMessageToWebExtension("/new_tab," + validURL[i])
}
}
}
func sendConfigToWebExtension() {
configJSON, _ := json.Marshal(viper.AllSettings())
sendMessageToWebExtension("/config," + string(configJSON))
}
|
