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gui.go
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gui.go
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package main
import (
"embed"
"encoding/json"
"fmt"
"io/fs"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
"time"
"github.com/getlantern/systray"
"github.com/gorilla/websocket"
)
var (
//go:embed svelte/public
f embed.FS
content, _ = fs.Sub(f, "svelte/public")
)
// --------------------------------tray functions-------------------------------
// open() is a cross-platform way to open URLs in the default browser
func open(url string) error {
var cmd string
var args []string
switch runtime.GOOS {
case "windows":
url = `"` + url + `"`
cmd = "powershell"
args = []string{"start"}
case "darwin":
cmd = "open"
default: // "linux", "freebsd", "openbsd", "netbsd"
cmd = "xdg-open"
}
args = append(args, url)
return exec.Command(cmd, args...).Start()
}
// onReady() defines settings for the tray icon
func onReady() {
ico, _ := ioutil.ReadFile("favicon.ico")
systray.SetTemplateIcon(ico, ico)
systray.SetTitle("Offpost")
systray.SetTooltip("Offpost")
mURL := systray.AddMenuItem("Open UI", "my home")
mQuit := systray.AddMenuItem("Quit", "Quit the whole app")
go func() {
for {
select {
case <-mURL.ClickedCh:
open("http://localhost:14859/")
case <-mQuit.ClickedCh:
log.Panic("User clicked quit button.")
}
}
}()
}
func onExit() {
fmt.Println(time.Now())
// ioutil.WriteFile(fmt.Sprintf(`on_exit_%d.txt`, now.UnixNano()), []byte(now.String()), 0644)
}
// --------------------------- end tray functions ------------------------------
// ---------- connect web server ----------
func (instances *allInstances) handleWebServer() {
http.HandleFunc("/config", instances.createWebSocket)
http.HandleFunc("/authdata", instances.createWebSocket)
// toggle between these lines for testing versus release
// server := http.FileServer(http.Dir("./svelte/public")) // for testing with `npm run dev`
server := http.FileServer(http.FS(content)) // for release (embed GUI in binary)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// if landing on /auth, serve main index.html *routed* to /auth
if r.URL.Path == "/auth" {
r.URL.Path = "/"
}
server.ServeHTTP(w, r)
})
userdata := http.FileServer(http.Dir("./userdata"))
http.Handle("/userdata/", http.StripPrefix("/userdata", userdata))
if err := http.ListenAndServe(":14859", nil); err != nil {
log.Fatal(err)
}
}
// --------------------------------------
// -------------------------- svelte gui functions -----------------------------
func (instances *allInstances) createWebSocket(w http.ResponseWriter, r *http.Request) {
url := r.URL.String()
var upgrader = websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
conn, _ := upgrader.Upgrade(w, r, nil)
clientClosed := make(chan bool)
instances.mu.Lock()
guiOpen = true
instances.mu.Unlock()
fmt.Print("GUI opening\n\n")
if url == "/authdata" {
select {
case info := <-instances.authComm:
_ = conn.WriteMessage(1, []byte(info))
case <-clientClosed:
return
}
} else {
wsSend <- ""
// sends to the GUI, when wsSend is fed a string
go func() {
for {
select {
case <-wsSend:
err := conn.WriteJSON(instances.c)
if err != nil {
fmt.Println(err)
}
case <-clientClosed:
// exit writer function when ReadMessage says client is closed
return
}
}
}()
}
// reads from the GUI
for {
_, p, err := conn.ReadMessage()
if err != nil {
instances.mu.Lock()
// ReadMessage returns err when client closes
clientClosed <- true
fmt.Print("GUI closing\n\n")
guiOpen = false
instances.mu.Unlock()
return
}
// this switch is used to identify the incoming message by the first word in the string
msg := string(p)
if url == "/authdata" {
instances.authComm <- msg
return
} else {
spaceIndex := strings.Index(msg, " ")
switch msg[:spaceIndex] {
case "s":
var data []*instance
json.Unmarshal(p[2:], &data)
instances.saveSettings(true, data)
case "d":
i, err := strconv.Atoi(msg[2:])
if err != nil {
log.Panic(err, "Delete instance error")
}
instances.deleteInst(i)
case "twitter":
i, _ := strconv.Atoi(msg[spaceIndex+1:])
instances.connectTwitter(i)
case "twitter,r":
i, _ := strconv.Atoi(msg[spaceIndex+1:])
fmt.Println(instances.c[i].Name, "DELETING TWITTER")
default:
fmt.Println("Invalid socket message received.")
}
}
}
}
func (instances *allInstances) deleteInst(index int) {
instances.mu.Lock()
fmt.Println("we're about to delete " + instances.c[index].Name)
fmt.Print("\n")
instNew := []*instance{}
for i, e := range instances.c {
if i != index {
instNew = append(instNew, e)
}
}
instances.c[index].restartMonitoring <- 1
instances.c = instNew
instances.mu.Unlock()
instances.saveSettings(false, instNew)
}
func (instances *allInstances) saveSettings(fromGui bool, new []*instance) {
if fromGui {
instances.mu.Lock()
fmt.Println("Saving settings.")
if len(new) > len(instances.c) {
newOne := len(new) - 1
instances.c = append(instances.c, new[newOne])
go instances.c[newOne].monitorFolder(false, instances)
<-instances.readySend
} else {
for i := range instances.c {
instances.c[i].Name = new[i].Name
instances.c[i].Caption = new[i].Caption
instances.c[i].StartupPostDelay = new[i].StartupPostDelay
new[i].NextPostTime = instances.c[i].NextPostTime
// retain keys when saving from GUI
for key := range new[i].Platforms {
if new[i].Platforms[key] != "no-config" {
new[i].Platforms[key] = instances.c[i].Platforms[key]
} else {
instances.c[i].Platforms[key] = new[i].Platforms[key]
}
}
// delete keys from backend when disconnected from frontend
for key := range instances.c[i].Platforms {
_, exists := new[i].Platforms[key]
if !exists {
fmt.Println(instances.c[i].Name+": deleting", key)
delete(instances.c[i].Platforms, key)
}
}
postDelayReset := false
needsRestart := false
if !sliceEqual(instances.c[i].ImgFolders, new[i].ImgFolders) {
instances.c[i].ImgFolders = new[i].ImgFolders
needsRestart = true
}
if instances.c[i].PostDelay != new[i].PostDelay {
instances.c[i].PostDelay = new[i].PostDelay
needsRestart = true
postDelayReset = true
}
if instances.c[i].QueueDelay != new[i].QueueDelay {
instances.c[i].QueueDelay = new[i].QueueDelay
needsRestart = true
}
if needsRestart {
instances.c[i].restartMonitoring <- 0
go instances.c[i].monitorFolder(postDelayReset, instances)
<-instances.readySend
}
}
}
fmt.Print("\n")
instances.mu.Unlock()
}
// defining this type separately from main "instance" type allows us to avoid
// saving certain fields to the json file, e.g. "ItemsInQueue" doesn't need
// to be saved because it's generated on startup
typeToSave := make([]struct {
Name string `json:"Name"`
ImgFolders []string `json:"ImgFolders"`
QueueDelay string `json:"QueueDelay"`
PostDelay string `json:"PostDelay"`
StartupPostDelay string `json:"StartupPostDelay"`
NextPostTime int64 `json:"NextPostTime"`
Platforms map[string]string `json:"Platforms"`
Caption string `json:"Caption"`
}, len(new))
for i := range new {
typeToSave[i].Name = new[i].Name
typeToSave[i].ImgFolders = new[i].ImgFolders
typeToSave[i].QueueDelay = new[i].QueueDelay
typeToSave[i].PostDelay = new[i].PostDelay
typeToSave[i].StartupPostDelay = new[i].StartupPostDelay
typeToSave[i].NextPostTime = new[i].NextPostTime
typeToSave[i].Platforms = new[i].Platforms
typeToSave[i].Caption = new[i].Caption
}
dataToSave, err := json.MarshalIndent(typeToSave, "", "\t")
if err != nil {
log.Panic(err)
}
os.WriteFile("./userdata/offpost.json", dataToSave, 0666)
}
func sliceEqual(a []string, b []string) bool {
if len(a) != len(b) {
return false
}
for i, v := range a {
if v != b[i] {
return false
}
}
return true
}
// ------------------------ end svelte gui functions ---------------------------