yarp-cli 0.2.1

Prune Pi command output and archive tool calls locally
Documentation 
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use std::fmt;

use serde::de::{DeserializeOwned, Error as _, MapAccess, SeqAccess, Visitor};
use serde::{Deserialize, Deserializer};
use serde_json::{Map, Number, Value};

/// Decode strict JSON while rejecting duplicate and unknown fields.
///
/// # Errors
///
/// Returns an error when JSON syntax, duplicate keys, trailing data, or the target model is invalid.
pub fn from_slice<T: DeserializeOwned>(bytes: &[u8]) -> Result<T, String> {
    let mut deserializer = serde_json::Deserializer::from_slice(bytes);
    let value = StrictValue::deserialize(&mut deserializer)
        .map_err(|error| format!("invalid JSON: {error}"))?
        .0;
    deserializer
        .end()
        .map_err(|error| format!("invalid trailing JSON data: {error}"))?;
    serde_json::from_value(value).map_err(|error| format!("invalid data: {error}"))
}

struct StrictValue(Value);

impl<'de> Deserialize<'de> for StrictValue {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: Deserializer<'de>,
    {
        deserializer.deserialize_any(StrictValueVisitor)
    }
}

struct StrictValueVisitor;

impl<'de> Visitor<'de> for StrictValueVisitor {
    type Value = StrictValue;

    fn expecting(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_str("a JSON value without duplicate object keys")
    }

    fn visit_bool<E>(self, value: bool) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::Bool(value)))
    }

    fn visit_i64<E>(self, value: i64) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::Number(Number::from(value))))
    }

    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::Number(Number::from(value))))
    }

    fn visit_f64<E>(self, value: f64) -> Result<Self::Value, E>
    where
        E: serde::de::Error,
    {
        Number::from_f64(value)
            .map(Value::Number)
            .map(StrictValue)
            .ok_or_else(|| E::custom("non-finite JSON number"))
    }

    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::String(value.to_owned())))
    }

    fn visit_string<E>(self, value: String) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::String(value)))
    }

    fn visit_none<E>(self) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::Null))
    }

    fn visit_unit<E>(self) -> Result<Self::Value, E> {
        Ok(StrictValue(Value::Null))
    }

    fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
    where
        D: Deserializer<'de>,
    {
        StrictValue::deserialize(deserializer)
    }

    fn visit_seq<A>(self, mut sequence: A) -> Result<Self::Value, A::Error>
    where
        A: SeqAccess<'de>,
    {
        let mut values = Vec::new();
        while let Some(value) = sequence.next_element::<StrictValue>()? {
            values.push(value.0);
        }
        Ok(StrictValue(Value::Array(values)))
    }

    fn visit_map<A>(self, mut object: A) -> Result<Self::Value, A::Error>
    where
        A: MapAccess<'de>,
    {
        let mut values = Map::new();
        while let Some(key) = object.next_key::<String>()? {
            if values.contains_key(&key) {
                return Err(A::Error::custom(format!("duplicate object key: {key}")));
            }
            let value = object.next_value::<StrictValue>()?;
            values.insert(key, value.0);
        }
        Ok(StrictValue(Value::Object(values)))
    }
}

#[cfg(test)]
mod tests {
    use serde::Deserialize;

    use super::*;

    #[derive(Debug, Deserialize, Eq, PartialEq)]
    #[serde(deny_unknown_fields)]
    struct Example {
        value: u32,
    }

    #[test]
    fn rejects_duplicate_and_unknown_fields() {
        assert!(from_slice::<Example>(br#"{"value":1,"value":2}"#).is_err());
        assert!(from_slice::<Example>(br#"{"value":1,"other":2}"#).is_err());
        assert_eq!(
            from_slice::<Example>(br#"{"value":1}"#).expect("valid"),
            Example { value: 1 }
        );
    }
}