feat(rust/signed-doc): enum map representation for metadata (#359)

* feat: metadata enum map representation * add encode/decode impl for Metadata * fix integer label, upd its doc * upd integer label doc. * use ProblemReport, remove map ord decode validation * Update rust/signed_doc/src/metadata/mod.rs

Author: Artur Helmanau

rust/signed_doc/Cargo.toml

@@ -21,7 +21,7 @@ minicbor = { version = "0.25.1", features = ["half"] }
 brotli = "7.0.0"
 ed25519-dalek = { version = "2.1.1", features = ["rand_core", "pem"] }
 hex = "0.4.3"
-strum = { version = "0.26.3", features = ["derive"] }
+strum = { version = "0.27.1", features = ["derive"] }
 clap = { version = "4.5.23", features = ["derive", "env"] }
 jsonschema = "0.28.3"
 jsonpath-rust = "0.7.5"

rust/signed_doc/src/decode_context.rs

@@ -4,6 +4,7 @@ use catalyst_types::problem_report::ProblemReport;
 
 /// Compatibility policy
 #[allow(dead_code)]
+#[derive(Copy, Clone)]
 pub(crate) enum CompatibilityPolicy {
  /// Silently allow obsoleted type conversions or non deterministic encoding.
  Accept,

rust/signed_doc/src/lib.rs

@@ -24,9 +24,7 @@ pub use catalyst_types::{
 pub use content::Content;
 use coset::{CborSerializable, Header, TaggedCborSerializable};
 use decode_context::{CompatibilityPolicy, DecodeContext};
-pub use metadata::{
- ContentEncoding, ContentType, DocType, DocumentRef, ExtraFields, Metadata, Section,
-};
+pub use metadata::{ContentEncoding, ContentType, DocType, DocumentRef, Metadata, Section};
 use minicbor::{decode, encode, Decode, Decoder, Encode};
 pub use signature::{CatalystId, Signatures};
 
@@ -134,9 +132,10 @@ impl CatalystSignedDocument {
  }
 
  /// Return document metadata content.
+ // TODO: remove this and provide getters from metadata like the rest of its fields have.
  #[must_use]
- pub fn doc_meta(&self) -> &ExtraFields {
- self.inner.metadata.extra()
+ pub fn doc_meta(&self) -> &Metadata {
+ &self.inner.metadata
  }
 
  /// Return a Document's signatures