balki/remote-local-storage
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support multiple hosts - by qwencoder

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This commit is contained in:
Balakrishnan Balasubramanian
2026-01-18 11:40:09 -05:00
parent 8d7834b38f
commit 769dffb4b5
2 changed files with 44 additions and 11 deletions
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50
main.go
View File

@@ -1,4 +1,6 @@
// Save and serve HTML local storage in server
// This application provides a wrapper to save and restore localStorage of webapps in a server.
// It's designed for browsers that clear localStorage when exiting (like Tor Browser) or to share localStorage across multiple browsers.
package main
import (
@@ -9,6 +11,7 @@ import (
"log"
"net/http"
"os"
"strings"
"time"
"go.balki.me/anyhttp"
@@ -17,57 +20,84 @@ import (
//go:embed wrap.html
var html []byte
func main() {
// getDumpFileName generates a hostname-specific dump filename
func getDumpFileName(host string) string {
// Extract hostname from Host header
hostname := host
if hostname == "" {
hostname = "localhost"
}
// Sanitize hostname to prevent path traversal
hostname = strings.ReplaceAll(hostname, "/", "_")
hostname = strings.ReplaceAll(hostname, "..", "_")
// Create dump file name with hostname
return hostname + "-dump.json"
}
func main() {
addr := flag.String("address", "localhost:3242", "Listen address. See go.balki.me/anyhttp for usage")
dumpFile := flag.String("dumpfile", "dump.json", "Path where local storage is saved in server")
flag.Parse()
// Handle root path - show error message
http.HandleFunc("/", func(w http.ResponseWriter, _ *http.Request) {
if _, err := w.Write([]byte("<h2>Error!</h2><p>Check your webserver config, You should not see this!</p>")); err != nil {
log.Panic(err)
}
})
// Serve the wrap.html page at /wrap/ path
http.HandleFunc("/wrap/", func(w http.ResponseWriter, r *http.Request) {
http.ServeContent(w, r, "index.html", time.Now(), bytes.NewReader(html))
})
// Handle saving local storage data to server
http.HandleFunc("/wrap/saveLS", func(w http.ResponseWriter, r *http.Request) {
// Read the request body containing localStorage data
data, err := io.ReadAll(r.Body)
if err != nil {
log.Panic(err)
}
if err := os.WriteFile(*dumpFile, data, 0o600); err != nil {
log.Panic(err)
}
// Generate dump filename
dumpFile := getDumpFileName(r.Host)
if err != nil {
// Write the data to the dump file
if err := os.WriteFile(dumpFile, data, 0o600); err != nil {
log.Panic(err)
}
log.Println("Saved!")
// Send OK response
if _, err := w.Write([]byte("OK")); err != nil {
log.Panic(err)
}
})
http.HandleFunc("/wrap/loadLS", func(w http.ResponseWriter, _ *http.Request) {
// Handle loading local storage data from server
http.HandleFunc("/wrap/loadLS", func(w http.ResponseWriter, r *http.Request) {
// Set proper content type for JSON response
w.Header().Set("Content-Type", "application/json")
data, err := os.ReadFile(*dumpFile)
if err != nil { // First time
// Generate dump filename
dumpFile := getDumpFileName(r.Host)
// Read the dump file
data, err := os.ReadFile(dumpFile)
if err != nil { // First time - return empty JSON
data = []byte("{}")
}
// Send the data back to client
if _, err := w.Write(data); err != nil {
log.Panic(err)
}
log.Println("Sent!")
})
// Start the HTTP server
err := anyhttp.ListenAndServe(*addr, nil)
if err != nil {
log.Panic(err)

5
wrap.html
View File

@@ -3,7 +3,7 @@
<head>
<link rel="icon" href="data:;base64,iVBORw0KGgo=" />
<script>
// Load local storage from server on page load
(async () => {
const resp = await fetch("loadLS");
const lsItems = JSON.parse(await resp.text());
@@ -13,6 +13,8 @@
console.log("Loaded local storage");
})();
// Function to save local storage to server
// This function is called periodically to sync localStorage with server
function postLocalStorage() {
(async () => {
const resp = await fetch("saveLS", {
@@ -26,6 +28,7 @@
})();
}
// Set up periodic saving every 10 minutes
setInterval(postLocalStorage, 10 * 60 * 1000) // 10 mins
</script>