Defined ErrorResponse type

sfw-provider/sfw-provider-requests/src/responses.rs

@@ -26,6 +26,10 @@ pub struct RegisterResponse {
     pub auth_token: AuthToken,
 }
 
+pub struct ErrorResponse {
+    pub message: String,
+}
+
 impl PullResponse {
     pub fn new(messages: Vec<Vec<u8>>) -> Self {
         PullResponse { messages }
@@ -38,6 +42,14 @@ impl RegisterResponse {
     }
 }
 
+impl ErrorResponse {
+    pub fn new<S: Into<String>>(message: S) -> Self {
+        ErrorResponse {
+            message: message.into(),
+        }
+    }
+}
+
 // TODO: This should go into some kind of utils module/crate
 fn read_be_u16(input: &mut &[u8]) -> u16 {
     let (int_bytes, rest) = input.split_at(std::mem::size_of::<u16>());
@@ -126,6 +138,19 @@ impl ProviderResponse for RegisterResponse {
     }
 }
 
+impl ProviderResponse for ErrorResponse {
+    fn to_bytes(&self) -> Vec<u8> {
+        self.message.clone().into_bytes()
+    }
+
+    fn from_bytes(bytes: &[u8]) -> Result<Self, ProviderResponseError> {
+        match String::from_utf8(bytes.to_vec()) {
+            Err(_) => Err(ProviderResponseError::UnmarshalError),
+            Ok(message) => Ok(ErrorResponse { message }),
+        }
+    }
+}
+
 #[cfg(test)]
 mod creating_pull_response {
     use super::*;