iron_valid 0.4.1

Request validation library for iron, based on Laravel's validation
Documentation 
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use serde_json;


use params::{Map, Value};

pub fn validate_json(values: &Map, field: &str) -> Result<Option<Value>, String> {
    match values.find(&[field]) {
        Some(&Value::String(ref value)) => {
            if value.is_empty() {
                // Allow empty values
                return Ok(None);
            }
            if serde_json::from_str::<serde_json::Value>(value).is_ok() {
                return Ok(None);
            }
            Err(format!("The {} field must contain a valid JSON string.",
                        field.to_lowercase().replace("_", " ")))
        }
        None => {
            // Allow empty values
            Ok(None)
        }
        _ => {
            Err(format!("The {} field must contain a valid JSON string.",
                        field.to_lowercase().replace("_", " ")))
        }
    }
}