1 files changed, 66 insertions, 2 deletions
diff --git a/src/device.rs b/src/device.rs
index 684f64a..1201540 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -54,7 +54,7 @@ enum Model {
 #[derive(Debug)]
 pub enum DeviceWrapper {
     /// A Nitrokey Storage device.
-    Storage(()),
+    Storage(Storage),
     /// A Nitrokey Pro device.
     Pro(Pro),
 }
@@ -101,6 +101,48 @@ pub enum DeviceWrapper {
 #[derive(Debug)]
 pub struct Pro {}
 
+/// A Nitrokey Storage device without user or admin authentication.
+///
+/// Use the global function [`connect`][] to obtain an instance wrapper or the method
+/// [`connect`][`Storage::connect`] to directly obtain an instance.  If you want to execute a
+/// command that requires user or admin authentication, use [`authenticate_admin`][] or
+/// [`authenticate_user`][].
+///
+/// # Examples
+///
+/// Authentication with error handling:
+///
+/// ```no_run
+/// use nitrokey::{Authenticate, User, Storage};
+/// # use nitrokey::CommandError;
+///
+/// fn perform_user_task(device: &User<Storage>) {}
+/// fn perform_other_task(device: &Storage) {}
+///
+/// # fn try_main() -> Result<(), CommandError> {
+/// let device = nitrokey::Storage::connect()?;
+/// let device = match device.authenticate_user("123456") {
+///     Ok(user) => {
+///         perform_user_task(&user);
+///         user.device()
+///     },
+///     Err((device, err)) => {
+///         println!("Could not authenticate as user: {:?}", err);
+///         device
+///     },
+/// };
+/// perform_other_task(&device);
+/// #     Ok(())
+/// # }
+/// ```
+///
+/// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin
+/// [`authenticate_user`]: trait.Authenticate.html#method.authenticate_user
+/// [`connect`]: fn.connect.html
+/// [`Storage::connect`]: #method.connect
+#[derive(Debug)]
+pub struct Storage {}
+
 /// A Nitrokey device.
 ///
 /// This trait provides the commands that can be executed without authentication and that are
@@ -368,7 +410,7 @@ fn connect_model(model: Model) -> bool {
 impl DeviceWrapper {
     fn device(&self) -> &Device {
         match *self {
-            DeviceWrapper::Storage(_) => panic!("..."),
+            DeviceWrapper::Storage(ref storage) => storage,
             DeviceWrapper::Pro(ref pro) => pro,
         }
     }
@@ -415,3 +457,25 @@ impl Drop for Pro {
 impl Device for Pro {}
 
 impl GenerateOtp for Pro {}
+
+impl Storage {
+    pub fn connect() -> Result<Storage, CommandError> {
+        // TODO: maybe Option instead of Result?
+        match connect_model(Model::Storage) {
+            true => Ok(Storage {}),
+            false => Err(CommandError::Unknown),
+        }
+    }
+}
+
+impl Drop for Storage {
+    fn drop(&mut self) {
+        unsafe {
+            nitrokey_sys::NK_logout();
+        }
+    }
+}
+
+impl Device for Storage {}
+
+impl GenerateOtp for Storage {}