cloudillo-types 0.8.16

Shared types, adapter traits, and error types for the Cloudillo federated collaboration platform
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// SPDX-FileCopyrightText: Szilárd Hajba
// SPDX-License-Identifier: LGPL-3.0-or-later

//! Hasher format for content-addressing. Capable of handling multiple versions and object variants.

use base64::Engine;
use sha2::{Digest, Sha256};

pub enum Hasher {
	V1(Sha256),
}

impl Default for Hasher {
	fn default() -> Self {
		Self::new()
	}
}

impl Hasher {
	pub fn new() -> Self {
		Self::V1(Sha256::new())
	}

	pub fn new_v1() -> Self {
		Self::V1(Sha256::new())
	}

	pub fn update(&mut self, data: &[u8]) {
		match self {
			Self::V1(hasher) => hasher.update(data),
		}
	}

	pub fn finalize(self, prefix: &str) -> String {
		match self {
			//Self::V2(hasher) => "2.".to_string() + &base64::engine::general_purpose::URL_SAFE_NO_PAD.encode(hasher.finalize())
			Self::V1(hasher) => {
				prefix.to_string()
					+ "1~" + &base64::engine::general_purpose::URL_SAFE_NO_PAD.encode(hasher.finalize())
			}
		}
	}
}

pub fn hash_v1(prefix: &str, data: &[u8]) -> Box<str> {
	let mut hasher = Hasher::new();
	hasher.update(data);
	let result = hasher.finalize(prefix);

	result.into()
}

pub fn hash(prefix: &str, data: &[u8]) -> Box<str> {
	hash_v1(prefix, data)
}

// vim: ts=4