Add login manager

Signed-off-by: kernelkind <kernelkind@gmail.com>

src/lib.rs

@@ -19,6 +19,7 @@ mod timeline;
 mod colors;
 mod profile;
 mod key_parsing;
+mod login_manager;
 
 #[cfg(test)]
 #[macro_use]

src/login_manager.rs

@@ -0,0 +1,23 @@
+use crate::key_parsing::LoginError;
+use nostr_sdk::Keys;
+use poll_promise::Promise;
+
+/// Helper storage object for retrieving the plaintext key from the user and converting it into a
+/// nostr-sdk Keys object if possible.
+pub struct LoginManager {
+    pub login_key: String,
+    pub promise: Option<Promise<Result<Keys, LoginError>>>,
+    pub error: Option<LoginError>,
+    pub key_on_error: Option<String>
+}
+
+impl LoginManager {
+    pub fn new() -> Self {
+        LoginManager {
+            login_key: String::new(),
+            promise: None,
+            error: None,
+            key_on_error: None
+        }
+    }
+}