refactor password

1. random password -> temporary password
2. security password -> permanent password
3. remove onetime password
4. add temporary password length setting
5. remove unnecessary ipc
6. always update temporary password after connection
7. show dots if permanent password is not empty
8. recover password style

Signed-off-by: 21pages <pages21@163.com>

libs/hbb_common/src/config.rs

@@ -534,9 +534,9 @@ impl Config {
         }
     }
 
-    pub fn get_auto_password() -> String {
+    pub fn get_auto_password(length: usize) -> String {
         let mut rng = rand::thread_rng();
-        (0..6)
+        (0..length)
             .map(|_| CHARS[rng.gen::<usize>() % CHARS.len()])
             .collect()
     }
@@ -657,7 +657,7 @@ impl Config {
         log::info!("id updated from {} to {}", id, new_id);
     }
 
-    pub fn set_security_password(password: &str) {
+    pub fn set_permanent_password(password: &str) {
         let mut config = CONFIG.write().unwrap();
         if password == config.password {
             return;
@@ -666,7 +666,7 @@ impl Config {
         config.store();
     }
 
-    pub fn get_security_password() -> String {
+    pub fn get_permanent_password() -> String {
         CONFIG.read().unwrap().password.clone()
     }
 
@@ -682,7 +682,7 @@ impl Config {
     pub fn get_salt() -> String {
         let mut salt = CONFIG.read().unwrap().salt.clone();
         if salt.is_empty() {
-            salt = Config::get_auto_password();
+            salt = Config::get_auto_password(6);
             Config::set_salt(&salt);
         }
         salt