kranz-engine 0.4.1

Governed mission engine for auditable AI coding-agent work.
Documentation 
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//! Decode authority-bearing JSON without accepting duplicate object keys.
use serde_json::Value;

pub(crate) fn parse(bytes: &[u8]) -> Result<Value, serde_json::Error> {
    serde_json::from_slice::<UniqueJson>(bytes).map(|UniqueJson(value)| value)
}

// serde_json::Value normally accepts duplicate object keys by keeping the
// last value. Authority-bearing frames must have one interpretation.
struct UniqueJson(Value);

impl<'de> serde::Deserialize<'de> for UniqueJson {
    fn deserialize<D: serde::Deserializer<'de>>(
        deserializer: D,
    ) -> std::result::Result<Self, D::Error> {
        struct Visitor;
        impl<'de> serde::de::Visitor<'de> for Visitor {
            type Value = UniqueJson;
            fn expecting(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                f.write_str("JSON without duplicate object keys")
            }
            fn visit_unit<E: serde::de::Error>(self) -> std::result::Result<UniqueJson, E> {
                Ok(UniqueJson(Value::Null))
            }
            fn visit_bool<E: serde::de::Error>(
                self,
                value: bool,
            ) -> std::result::Result<UniqueJson, E> {
                Ok(UniqueJson(value.into()))
            }
            fn visit_i64<E: serde::de::Error>(
                self,
                value: i64,
            ) -> std::result::Result<UniqueJson, E> {
                Ok(UniqueJson(value.into()))
            }
            fn visit_u64<E: serde::de::Error>(
                self,
                value: u64,
            ) -> std::result::Result<UniqueJson, E> {
                Ok(UniqueJson(value.into()))
            }
            fn visit_f64<E: serde::de::Error>(
                self,
                value: f64,
            ) -> std::result::Result<UniqueJson, E> {
                serde_json::Number::from_f64(value)
                    .map(|number| UniqueJson(Value::Number(number)))
                    .ok_or_else(|| E::custom("non-finite JSON number"))
            }
            fn visit_str<E: serde::de::Error>(
                self,
                value: &str,
            ) -> std::result::Result<UniqueJson, E> {
                Ok(UniqueJson(value.into()))
            }
            fn visit_seq<A: serde::de::SeqAccess<'de>>(
                self,
                mut seq: A,
            ) -> std::result::Result<UniqueJson, A::Error> {
                let mut values = Vec::new();
                while let Some(UniqueJson(value)) = seq.next_element()? {
                    values.push(value);
                }
                Ok(UniqueJson(Value::Array(values)))
            }
            fn visit_map<A: serde::de::MapAccess<'de>>(
                self,
                mut map: A,
            ) -> std::result::Result<UniqueJson, A::Error> {
                let mut values = serde_json::Map::new();
                while let Some(key) = map.next_key::<String>()? {
                    if values.contains_key(&key) {
                        return Err(serde::de::Error::custom("duplicate JSON object key"));
                    }
                    let UniqueJson(value) = map.next_value()?;
                    values.insert(key, value);
                }
                Ok(UniqueJson(Value::Object(values)))
            }
        }
        deserializer.deserialize_any(Visitor)
    }
}