implement fix for broken sbor json model

Author: 0xOmarA

crates/sbor-json/src/scrypto/programmatic/value.rs

@@ -76,7 +76,10 @@ pub enum ProgrammaticScryptoValue {
     },
     Enum {
         #[serde(rename = "variant_id")]
-        #[serde_as(as = "serde_with::DisplayFromStr")]
+        // TODO: Revert back once the gateway is past the transition phase.
+        // #[serde_as(as = "serde_with::DisplayFromStr")]
+        #[serde(serialize_with = "serialize_enum_discriminator")]
+        #[serde(deserialize_with = "deserialize_enum_discriminator")]
         discriminator: u8,
         fields: Vec<ProgrammaticScryptoValue>,
     },
@@ -418,3 +421,30 @@ impl ProgrammaticScryptoValue {
         }
     }
 }
+
+fn serialize_enum_discriminator<S>(
+    value: &u8,
+    serializer: S,
+) -> Result<S::Ok, S::Error>
+where
+    S: serde::ser::Serializer,
+{
+    serializer.serialize_str(&value.to_string())
+}
+
+fn deserialize_enum_discriminator<'de, D>(
+    deserializer: D,
+) -> Result<u8, D::Error>
+where
+    D: serde::de::Deserializer<'de>,
+{
+    match serde_json::Value::deserialize(deserializer)? {
+        serde_json::Value::Number(number) => number
+            .as_u64()
+            .and_then(|value| u8::try_from(value).ok())
+            .ok_or(serde::de::Error::custom("Not a valid number")),
+        serde_json::Value::String(string) => u8::from_str(&string)
+            .map_err(|_| serde::de::Error::custom("Not a valid number")),
+        _ => Err(serde::de::Error::custom("Neither a number nor a string")),
+    }
+}

crates/sbor-json/tests/programmatic_scrypto_sbor.rs

@@ -199,6 +199,72 @@ pub fn value_with_two_address_of_the_differing_networks_has_a_network_mismatch()
     assert!(contains_network_mismatch)
 }
 
+#[test]
+pub fn enum_with_string_variant_id_can_be_deserialized() {
+    // Arrange
+    let value = r#"
+    {
+        "kind": "Enum",
+        "variant_id": "10",
+        "fields": []
+    }
+    "#;
+
+    // Act
+    let value = serde_json::from_str::<ProgrammaticScryptoValue>(&value);
+
+    // Assert
+    assert!(matches!(
+        value,
+        Ok(ProgrammaticScryptoValue::Enum {
+            discriminator: 10,
+            fields,
+        }) if fields.is_empty()
+    ))
+}
+
+#[test]
+pub fn enum_with_numeric_variant_id_can_be_deserialized() {
+    // Arrange
+    let value = r#"
+    {
+        "kind": "Enum",
+        "variant_id": 10,
+        "fields": []
+    }
+    "#;
+
+    // Act
+    let value = serde_json::from_str::<ProgrammaticScryptoValue>(&value);
+
+    // Assert
+    assert!(matches!(
+        value,
+        Ok(ProgrammaticScryptoValue::Enum {
+            discriminator: 10,
+            fields,
+        }) if fields.is_empty()
+    ))
+}
+
+#[test]
+pub fn enum_is_serialized_with_string_variant_id() {
+    // Arrange
+    let value = ProgrammaticScryptoValue::Enum {
+        discriminator: 10,
+        fields: vec![],
+    };
+
+    // Act
+    let value = serde_json::to_value(&value);
+
+    // Assert
+    assert_eq!(
+        value.unwrap().get("variant_id").unwrap().as_str().unwrap(),
+        "10"
+    )
+}
+
 /// Tests that the programmatic JSON representation from the
 /// radixdlt/radixdlt-scrypto repo and the one in this repo match.
 pub fn programmatic_json_representations_match<T>(object: &T)