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# c7161ec1a607 spectra / crates / spectra-core / src / attachments.rs
970 B · Rust · last changed Spectra stands alone: its own identities, signatures and CBOR; projects of any kind of work (#26, #27) 1 day ago source blame history raw
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//! Bytes kept beside the ledger, named by their BLAKE3 (spec §7.2): tool
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//! call arguments and results in full, so the audit is never truncated;
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//! retention drops old bodies and keeps the hashes (spec §22.1).
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use anyhow::Result;
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use std::path::Path;
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/// Store `bytes` under `<data>/attachments/` and return their hash (hex).
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pub fn put(data: &Path, bytes: &[u8]) -> Result<String> {
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    let hash = blake3::hash(bytes).to_hex().to_string();
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    let dir = data.join("attachments").join(&hash[..2]);
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    let path = dir.join(&hash);
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    if !path.exists() {
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        std::fs::create_dir_all(&dir)?;
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        crate::durable::write_atomic(&path, bytes)?;
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    }
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    Ok(hash)
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}
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/// The bytes stored under `hash`, if they are still kept.
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pub fn get(data: &Path, hash: &str) -> Option<Vec<u8>> {
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    if hash.len() < 3 || !hash.bytes().all(|b| b.is_ascii_hexdigit()) {
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        return None;
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    }
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    std::fs::read(data.join("attachments").join(&hash[..2]).join(hash)).ok()
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}