Move the authenticate methods to a new Authenticate trait

1 files changed, 71 insertions, 50 deletions

diff --git a/src/device.rs b/src/device.rs
index ce45a50..ab90d3d 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -28,7 +28,7 @@ pub enum Model {
 /// Authentication with error handling:
 ///
 /// ```no_run
-/// use nitrokey::{UnauthenticatedDevice, UserAuthenticatedDevice};
+/// use nitrokey::{Authenticate, UnauthenticatedDevice, UserAuthenticatedDevice};
 /// # use nitrokey::CommandError;
 ///
 /// fn perform_user_task(device: &UserAuthenticatedDevice) {}
@@ -51,8 +51,8 @@ pub enum Model {
 /// # }
 /// ```
 ///
-/// [`authenticate_admin`]: #method.authenticate_admin
-/// [`authenticate_user`]: #method.authenticate_user
+/// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin
+/// [`authenticate_user`]: trait.Authenticate.html#method.authenticate_user
 /// [`connect`]: fn.connect.html
 /// [`connect_model`]: fn.connect_model.html
 #[derive(Debug)]
@@ -64,7 +64,7 @@ pub struct UnauthenticatedDevice {}
 /// method on an [`UnauthenticatedDevice`][].  To get back to an
 /// unauthenticated device, use the [`device`][] method.
 ///
-/// [`authenticate_admin`]: struct.UnauthenticatedDevice#method.authenticate_admin
+/// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin
 /// [`device`]: #method.device
 /// [`UnauthenticatedDevice`]: struct.UnauthenticatedDevice.html
 #[derive(Debug)]
@@ -79,7 +79,7 @@ pub struct UserAuthenticatedDevice {
 /// method on an [`UnauthenticatedDevice`][].  To get back to an
 /// unauthenticated device, use the [`device`][] method.
 ///
-/// [`authenticate_admin`]: struct.UnauthenticatedDevice#method.authenticate_admin
+/// [`authenticate_admin`]: trait.Authenticate.html#method.authenticate_admin
 /// [`device`]: #method.device
 /// [`UnauthenticatedDevice`]: struct.UnauthenticatedDevice.html
 #[derive(Debug)]
@@ -350,38 +350,10 @@ pub trait Device {
     }
 }
 
-trait AuthenticatedDevice {
-    fn new(device: UnauthenticatedDevice, temp_password: Vec<u8>) -> Self;
-}
-
-impl UnauthenticatedDevice {
-    fn authenticate<D, T>(
-        self,
-        password: &str,
-        callback: T,
-    ) -> Result<D, (UnauthenticatedDevice, CommandError)>
-    where
-        D: AuthenticatedDevice,
-        T: Fn(*const i8, *const i8) -> c_int,
-    {
-        let temp_password = match generate_password(TEMPORARY_PASSWORD_LENGTH) {
-            Ok(pw) => pw,
-            Err(_) => return Err((self, CommandError::RngError)),
-        };
-        let password = CString::new(password);
-        if password.is_err() {
-            return Err((self, CommandError::InvalidString));
-        }
-
-        let pw = password.unwrap();
-        let password_ptr = pw.as_ptr();
-        let temp_password_ptr = temp_password.as_ptr() as *const i8;
-        return match callback(password_ptr, temp_password_ptr) {
-            0 => Ok(D::new(self, temp_password)),
-            rv => Err((self, CommandError::from(rv))),
-        };
-    }
-
+/// Provides methods to authenticate as a user or as an admin using a PIN.  The authenticated
+/// methods will consume the current device instance.  On success, they return the authenticated
+/// device.  Otherwise, they return the current unauthenticated device and the error code.
+pub trait Authenticate {
     /// Performs user authentication.  This method consumes the device.  If
     /// successful, an authenticated device is returned.  Otherwise, the
     /// current unauthenticated device and the error are returned.
@@ -398,7 +370,7 @@ impl UnauthenticatedDevice {
     /// # Example
     ///
     /// ```no_run
-    /// use nitrokey::{UnauthenticatedDevice, UserAuthenticatedDevice};
+    /// use nitrokey::{Authenticate, UnauthenticatedDevice, UserAuthenticatedDevice};
     /// # use nitrokey::CommandError;
     ///
     /// fn perform_user_task(device: &UserAuthenticatedDevice) {}
@@ -424,14 +396,12 @@ impl UnauthenticatedDevice {
     /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
     /// [`RngError`]: enum.CommandError.html#variant.RngError
     /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
-    pub fn authenticate_user(
+    fn authenticate_user(
         self,
         password: &str,
-    ) -> Result<UserAuthenticatedDevice, (UnauthenticatedDevice, CommandError)> {
-        return self.authenticate(password, |password_ptr, temp_password_ptr| unsafe {
-            nitrokey_sys::NK_user_authenticate(password_ptr, temp_password_ptr)
-        });
-    }
+    ) -> Result<UserAuthenticatedDevice, (Self, CommandError)>
+    where
+        Self: Sized;
 
     /// Performs admin authentication.  This method consumes the device.  If
     /// successful, an authenticated device is returned.  Otherwise, the
@@ -449,7 +419,7 @@ impl UnauthenticatedDevice {
     /// # Example
     ///
     /// ```no_run
-    /// use nitrokey::{AdminAuthenticatedDevice, UnauthenticatedDevice};
+    /// use nitrokey::{Authenticate, AdminAuthenticatedDevice, UnauthenticatedDevice};
     /// # use nitrokey::CommandError;
     ///
     /// fn perform_admin_task(device: &AdminAuthenticatedDevice) {}
@@ -475,10 +445,61 @@ impl UnauthenticatedDevice {
     /// [`InvalidString`]: enum.CommandError.html#variant.InvalidString
     /// [`RngError`]: enum.CommandError.html#variant.RngError
     /// [`WrongPassword`]: enum.CommandError.html#variant.WrongPassword
-    pub fn authenticate_admin(
+    fn authenticate_admin(
+        self,
+        password: &str,
+    ) -> Result<AdminAuthenticatedDevice, (Self, CommandError)>
+    where
+        Self: Sized;
+}
+
+trait AuthenticatedDevice {
+    fn new(device: UnauthenticatedDevice, temp_password: Vec<u8>) -> Self;
+}
+
+impl UnauthenticatedDevice {
+    fn authenticate<D, T>(
+        self,
+        password: &str,
+        callback: T,
+    ) -> Result<D, (UnauthenticatedDevice, CommandError)>
+    where
+        D: AuthenticatedDevice,
+        T: Fn(*const i8, *const i8) -> c_int,
+    {
+        let temp_password = match generate_password(TEMPORARY_PASSWORD_LENGTH) {
+            Ok(pw) => pw,
+            Err(_) => return Err((self, CommandError::RngError)),
+        };
+        let password = CString::new(password);
+        if password.is_err() {
+            return Err((self, CommandError::InvalidString));
+        }
+
+        let pw = password.unwrap();
+        let password_ptr = pw.as_ptr();
+        let temp_password_ptr = temp_password.as_ptr() as *const i8;
+        return match callback(password_ptr, temp_password_ptr) {
+            0 => Ok(D::new(self, temp_password)),
+            rv => Err((self, CommandError::from(rv))),
+        };
+    }
+}
+
+impl Authenticate for UnauthenticatedDevice {
+    fn authenticate_user(
+        self,
+        password: &str,
+    ) -> Result<UserAuthenticatedDevice, (Self, CommandError)> {
+        return self.authenticate(password, |password_ptr, temp_password_ptr| unsafe {
+            nitrokey_sys::NK_user_authenticate(password_ptr, temp_password_ptr)
+        });
+    }
+
+    fn authenticate_admin(
         self,
         password: &str,
-    ) -> Result<AdminAuthenticatedDevice, (UnauthenticatedDevice, CommandError)> {
+    ) -> Result<AdminAuthenticatedDevice, (Self, CommandError)> {
         return self.authenticate(password, |password_ptr, temp_password_ptr| unsafe {
             nitrokey_sys::NK_first_authenticate(password_ptr, temp_password_ptr)
         });
@@ -521,7 +542,7 @@ impl GenerateOtp for UserAuthenticatedDevice {
     /// # Example
     ///
     /// ```no_run
-    /// use nitrokey::{Device, GenerateOtp};
+    /// use nitrokey::{Authenticate, GenerateOtp};
     /// # use nitrokey::CommandError;
     ///
     /// # fn try_main() -> Result<(), CommandError> {
@@ -562,7 +583,7 @@ impl GenerateOtp for UserAuthenticatedDevice {
     /// # Example
     ///
     /// ```no_run
-    /// use nitrokey::{Device, GenerateOtp};
+    /// use nitrokey::{Authenticate, GenerateOtp};
     /// # use nitrokey::CommandError;
     ///
     /// # fn try_main() -> Result<(), CommandError> {
@@ -623,7 +644,7 @@ impl AdminAuthenticatedDevice {
     /// # Example
     ///
     /// ```no_run
-    /// use nitrokey::Config;
+    /// use nitrokey::{Authenticate, Config};
     /// # use nitrokey::CommandError;
     ///
     /// # fn try_main() -> Result<(), CommandError> {