50 lines
1.6 KiB
Rust
50 lines
1.6 KiB
Rust
use anyhow::{bail, Error};
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use serde_json::Value;
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// Generate canonical json
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pub fn to_canonical_json(value: &Value) -> Result<Vec<u8>, Error> {
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let mut data = Vec::new();
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write_canonical_json(value, &mut data)?;
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Ok(data)
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}
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pub fn write_canonical_json(value: &Value, output: &mut Vec<u8>) -> Result<(), Error> {
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match value {
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Value::Null => bail!("got unexpected null value"),
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Value::String(_) | Value::Number(_) | Value::Bool(_) => {
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serde_json::to_writer(output, &value)?;
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}
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Value::Array(list) => {
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output.push(b'[');
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let mut iter = list.iter();
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if let Some(item) = iter.next() {
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write_canonical_json(item, output)?;
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for item in iter {
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output.push(b',');
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write_canonical_json(item, output)?;
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}
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}
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output.push(b']');
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}
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Value::Object(map) => {
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output.push(b'{');
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let mut keys: Vec<&str> = map.keys().map(String::as_str).collect();
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keys.sort_unstable();
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let mut iter = keys.into_iter();
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if let Some(key) = iter.next() {
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serde_json::to_writer(&mut *output, &key)?;
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output.push(b':');
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write_canonical_json(&map[key], output)?;
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for key in iter {
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output.push(b',');
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serde_json::to_writer(&mut *output, &key)?;
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output.push(b':');
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write_canonical_json(&map[key], output)?;
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}
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}
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output.push(b'}');
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}
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}
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Ok(())
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}
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