feat(rust/cbork): Add report_duplicated_key and report_missing_keys functions to the cbork-utils crate

rust/cbork-utils/Cargo.toml

@@ -13,6 +13,8 @@ workspace = true
 [dependencies]
 minicbor = { version = "0.25.1", features = ["std"] }
 
+catalyst-types = { version = "0.0.1", git = "https://github.com/input-output-hk/catalyst-libs.git", tag = "r20250124-00" }
+
 [dev-dependencies]
 proptest = { version = "1.5.0" }
 # Potentially it could be replaced with using `proptest::property_test` attribute macro,

rust/cbork-utils/src/decode_helper.rs

@@ -1,5 +1,8 @@
 //! CBOR decoding helper functions.
 
+use std::fmt::Debug;
+
+use catalyst_types::problem_report::ProblemReport;
 use minicbor::{data::Tag, decode, Decoder};
 
 /// Generic helper function for decoding different types.
@@ -92,6 +95,34 @@ pub fn decode_any<'d>(d: &mut Decoder<'d>, from: &str) -> Result<&'d [u8], decod
     Ok(bytes)
 }
 
+/// Adds a "duplicated field" entry to the report and returns true if the field is already
+/// present in the given found keys list.
+pub fn report_duplicated_key<T: Debug + PartialEq>(
+    found_keys: &[T], key: &T, index: u64, context: &str, report: &ProblemReport,
+) -> bool {
+    if found_keys.contains(key) {
+        report.duplicate_field(
+            format!("{key:?}").as_str(),
+            format!("Redundant key found in item {} in RBAC map", index + 1).as_str(),
+            context,
+        );
+        return true;
+    }
+    false
+}
+
+/// Adds a "missing field" entry to the report for every required key that isn't present
+/// in the found keys list.
+pub fn report_missing_keys<T: Debug + PartialEq>(
+    found_keys: &[T], required_keys: &[T], context: &str, report: &ProblemReport,
+) {
+    for key in required_keys {
+        if !found_keys.contains(key) {
+            report.missing_field(&format!("{key:?}"), context);
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use minicbor::Encoder;