feat(sdk): add DataContractMismatch enum for detailed contract comparison

packages/rs-dpp/src/data_contract/serialized_version/mod.rs

@@ -1,18 +1,16 @@
-use crate::data_contract::serialized_version::v0::DataContractInSerializationFormatV0;
-use crate::data_contract::{
-    DataContract, DefinitionName, DocumentName, GroupContractPosition, TokenContractPosition,
-    EMPTY_GROUPS, EMPTY_TOKENS,
-};
-use crate::version::PlatformVersion;
-use std::collections::BTreeMap;
-
 use super::EMPTY_KEYWORDS;
 use crate::data_contract::associated_token::token_configuration::TokenConfiguration;
 use crate::data_contract::group::Group;
+use crate::data_contract::serialized_version::v0::DataContractInSerializationFormatV0;
 use crate::data_contract::serialized_version::v1::DataContractInSerializationFormatV1;
 use crate::data_contract::v0::DataContractV0;
 use crate::data_contract::v1::DataContractV1;
+use crate::data_contract::{
+    DataContract, DefinitionName, DocumentName, GroupContractPosition, TokenContractPosition,
+    EMPTY_GROUPS, EMPTY_TOKENS,
+};
 use crate::validation::operations::ProtocolValidationOperation;
+use crate::version::PlatformVersion;
 use crate::ProtocolError;
 use bincode::{Decode, Encode};
 use derive_more::From;
@@ -21,6 +19,8 @@ use platform_version::{IntoPlatformVersioned, TryFromPlatformVersioned};
 use platform_versioning::PlatformVersioned;
 #[cfg(feature = "data-contract-serde-conversion")]
 use serde::{Deserialize, Serialize};
+use std::collections::BTreeMap;
+use std::fmt;
 
 pub(in crate::data_contract) mod v0;
 pub(in crate::data_contract) mod v1;
@@ -34,6 +34,62 @@ pub mod property_names {
 
 pub const CONTRACT_DESERIALIZATION_LIMIT: usize = 15000;
 
+/// Represents a field mismatch between two `DataContractInSerializationFormat::V1`
+/// variants, or indicates a format version mismatch.
+///
+/// Used to diagnose why two data contracts are not considered equal
+/// when ignoring auto-generated fields.
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum DataContractMismatch {
+    /// The `id` fields are not equal.
+    Id,
+    /// The `config` fields are not equal.
+    Config,
+    /// The `version` fields are not equal.
+    Version,
+    /// The `owner_id` fields are not equal.
+    OwnerId,
+    /// The `schema_defs` fields are not equal.
+    SchemaDefs,
+    /// The `document_schemas` fields are not equal.
+    DocumentSchemas,
+    /// The `groups` fields are not equal.
+    Groups,
+    /// The `tokens` fields are not equal.
+    Tokens,
+    /// The `keywords` fields are not equal.
+    Keywords,
+    /// The `description` fields are not equal.
+    Description,
+    /// The two variants are of different serialization formats (e.g., V0 vs V1).
+    FormatVersionMismatch,
+    /// The two variants are different in V0.
+    V0Mismatch,
+}
+
+impl fmt::Display for DataContractMismatch {
+    /// Formats the enum into a human-readable string describing the mismatch.
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let description = match self {
+            DataContractMismatch::Id => "ID fields differ",
+            DataContractMismatch::Config => "Config fields differ",
+            DataContractMismatch::Version => "Version fields differ",
+            DataContractMismatch::OwnerId => "Owner ID fields differ",
+            DataContractMismatch::SchemaDefs => "Schema definitions differ",
+            DataContractMismatch::DocumentSchemas => "Document schemas differ",
+            DataContractMismatch::Groups => "Groups differ",
+            DataContractMismatch::Tokens => "Tokens differ",
+            DataContractMismatch::Keywords => "Keywords differ",
+            DataContractMismatch::Description => "Description fields differ",
+            DataContractMismatch::FormatVersionMismatch => {
+                "Serialization format versions differ (e.g., V0 vs V1)"
+            }
+            DataContractMismatch::V0Mismatch => "V0 versions differ",
+        };
+        write!(f, "{}", description)
+    }
+}
+
 #[derive(Debug, Clone, Encode, Decode, PartialEq, PlatformVersioned, From)]
 #[cfg_attr(
     feature = "data-contract-serde-conversion",
@@ -112,36 +168,65 @@ impl DataContractInSerializationFormat {
         }
     }
 
-    pub fn eq_without_auto_fields(&self, other: &Self) -> bool {
+    /// Compares `self` to another `DataContractInSerializationFormat` instance
+    /// and returns the first mismatching field, if any.
+    ///
+    /// This comparison ignores auto-generated fields and is only sensitive to
+    /// significant differences in contract content. For V0 formats, any difference
+    /// results in a generic mismatch. For differing format versions (V0 vs V1),
+    /// a `FormatVersionMismatch` is returned.
+    ///
+    /// # Returns
+    ///
+    /// - `None` if the contracts are equal according to the relevant fields.
+    /// - `Some(DataContractMismatch)` indicating the first field where they differ.
+    pub fn first_mismatch(&self, other: &Self) -> Option<DataContractMismatch> {
         match (self, other) {
             (
                 DataContractInSerializationFormat::V0(v0_self),
                 DataContractInSerializationFormat::V0(v0_other),
-            ) => v0_self == v0_other,
+            ) => {
+                if v0_self != v0_other {
+                    Some(DataContractMismatch::V0Mismatch)
+                } else {
+                    None
+                }
+            }
             (
                 DataContractInSerializationFormat::V1(v1_self),
                 DataContractInSerializationFormat::V1(v1_other),
             ) => {
-                v1_self.id == v1_other.id
-                    && v1_self.config == v1_other.config
-                    && v1_self.version == v1_other.version
-                    && v1_self.owner_id == v1_other.owner_id
-                    && v1_self.schema_defs == v1_other.schema_defs
-                    && v1_self.document_schemas == v1_other.document_schemas
-                    && v1_self.groups == v1_other.groups
-                    && v1_self.tokens == v1_other.tokens
-                    && v1_self.keywords == v1_other.keywords
-                    && v1_self.description == v1_other.description
+                if v1_self.id != v1_other.id {
+                    Some(DataContractMismatch::Id)
+                } else if v1_self.config != v1_other.config {
+                    Some(DataContractMismatch::Config)
+                } else if v1_self.version != v1_other.version {
+                    Some(DataContractMismatch::Version)
+                } else if v1_self.owner_id != v1_other.owner_id {
+                    Some(DataContractMismatch::OwnerId)
+                } else if v1_self.schema_defs != v1_other.schema_defs {
+                    Some(DataContractMismatch::SchemaDefs)
+                } else if v1_self.document_schemas != v1_other.document_schemas {
+                    Some(DataContractMismatch::DocumentSchemas)
+                } else if v1_self.groups != v1_other.groups {
+                    Some(DataContractMismatch::Groups)
+                } else if v1_self.tokens != v1_other.tokens {
+                    Some(DataContractMismatch::Tokens)
+                } else if v1_self.keywords.len() != v1_other.keywords.len()
+                    || v1_self
+                        .keywords
+                        .iter()
+                        .zip(v1_other.keywords.iter())
+                        .any(|(a, b)| a.to_lowercase() != b.to_lowercase())
+                {
+                    Some(DataContractMismatch::Keywords)
+                } else if v1_self.description != v1_other.description {
+                    Some(DataContractMismatch::Description)
+                } else {
+                    None
+                }
             }
-            // Cross-version comparisons return false
-            (
-                DataContractInSerializationFormat::V0(_),
-                DataContractInSerializationFormat::V1(_),
-            )
-            | (
-                DataContractInSerializationFormat::V1(_),
-                DataContractInSerializationFormat::V0(_),
-            ) => false,
+            _ => Some(DataContractMismatch::FormatVersionMismatch),
         }
     }
 }

packages/rs-drive/src/verify/state_transition/verify_state_transition_was_executed_with_proof/v0/mod.rs

@@ -81,10 +81,10 @@ impl Drive {
                     .clone()
                     .try_into_platform_versioned(platform_version)?;
 
-                if !contract_for_serialization
-                    .eq_without_auto_fields(data_contract_create.data_contract())
+                if let Some(mismatch) =
+                    contract_for_serialization.first_mismatch(data_contract_create.data_contract())
                 {
-                    return Err(Error::Proof(ProofError::IncorrectProof(format!("proof of state transition execution did not contain exact expected contract after create with id {}", data_contract_create.data_contract().id()))));
+                    return Err(Error::Proof(ProofError::IncorrectProof(format!("proof of state transition execution did not contain exact expected contract after create with id {}: {}", data_contract_create.data_contract().id(), mismatch))));
                 }
 
                 Ok((root_hash, VerifiedDataContract(contract)))
@@ -103,10 +103,10 @@ impl Drive {
                 let contract_for_serialization: DataContractInSerializationFormat = contract
                     .clone()
                     .try_into_platform_versioned(platform_version)?;
-                if !contract_for_serialization
-                    .eq_without_auto_fields(data_contract_update.data_contract())
+                if let Some(mismatch) =
+                    contract_for_serialization.first_mismatch(data_contract_update.data_contract())
                 {
-                    return Err(Error::Proof(ProofError::IncorrectProof(format!("proof of state transition execution did not contain exact expected contract after update with id {}", data_contract_update.data_contract().id()))));
+                    return Err(Error::Proof(ProofError::IncorrectProof(format!("proof of state transition execution did not contain exact expected contract after update with id {}: {}", data_contract_update.data_contract().id(), mismatch))));
                 }
                 Ok((root_hash, VerifiedDataContract(contract)))
             }