Customize Bootstrap Relays (#205)

* feat: add bootstrap relays file

* feat: add save bootstrap relays command

* feat: add customize bootstrap relays screen

src-tauri/src/nostr/relay.rs

@@ -1,8 +1,13 @@
+use std::{
+  fs,
+  io::{self, BufRead, Write},
+};
+
 use crate::Nostr;
 use nostr_sdk::prelude::*;
 use serde::Serialize;
 use specta::Type;
-use tauri::State;
+use tauri::{path::BaseDirectory, Manager, State};
 
 #[derive(Serialize, Type)]
 pub struct Relays {
@@ -103,3 +108,42 @@ pub async fn remove_relay(relay: &str, state: State<'_, Nostr>) -> Result<bool,
     Ok(false)
   }
 }
+
+#[tauri::command]
+#[specta::specta]
+pub fn get_bootstrap_relays(app: tauri::AppHandle) -> Result<Vec<String>, ()> {
+  let relays_path = app
+    .path()
+    .resolve("resources/relays.txt", BaseDirectory::Resource)
+    .expect("Bootstrap relays not found.");
+
+  let file = std::fs::File::open(&relays_path).unwrap();
+  let lines = io::BufReader::new(file).lines();
+
+  let mut relays = Vec::new();
+
+  for line in lines.flatten() {
+    relays.push(line.to_string())
+  }
+
+  Ok(relays)
+}
+
+#[tauri::command]
+#[specta::specta]
+pub fn save_bootstrap_relays(relays: &str, app: tauri::AppHandle) -> Result<(), String> {
+  let relays_path = app
+    .path()
+    .resolve("resources/relays.txt", BaseDirectory::Resource)
+    .expect("Bootstrap relays not found.");
+
+  let mut file = fs::OpenOptions::new()
+    .write(true)
+    .open(&relays_path)
+    .unwrap();
+
+  match file.write_all(relays.as_bytes()) {
+    Ok(_) => Ok(()),
+    Err(_) => Err("Cannot save bootstrap relays, please try again later.".into()),
+  }
+}