Add shared lib

backend/sync_lib/src/errors.rs

@@ -0,0 +1,24 @@
+use base64::DecodeError;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum SyncLibError {
+    #[error("Base64 decoding error: {}", .reason)]
+    DecodingError { reason: String },
+}
+
+impl From<DecodeError> for SyncLibError {
+    fn from(e: DecodeError) -> Self {
+        SyncLibError::DecodingError {
+            reason: e.to_string(),
+        }
+    }
+}
+
+impl From<std::string::FromUtf8Error> for SyncLibError {
+    fn from(e: std::string::FromUtf8Error) -> Self {
+        SyncLibError::DecodingError {
+            reason: e.to_string(),
+        }
+    }
+}