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#[macro_use]
extern crate custom_error;
#[macro_use]
extern crate serde_derive;
use sha2::digest::FixedOutput;
use sha2::{Digest, Sha512Trunc256};
use std::path::Path;
pub type Hash = String;
#[derive(Debug, Serialize, Deserialize)]
#[serde(untagged)]
pub enum Node {
File(FileNode),
Dir(DirNode),
}
custom_error! { pub NodeError
IO { source: std::io::Error } = "",
Foo { source: std::path::StripPrefixError } = "",
}
#[derive(Debug, Serialize, Deserialize)]
pub struct FileNode {
pub path: String,
pub hash: Hash,
pub size: u64,
}
impl FileNode {
pub fn from_path(path: &Path, root: &Path) -> Result<Self, NodeError> {
let contents = std::fs::read(path)?;
let contents_hash = hash(contents);
let local_filename = path.strip_prefix(root)?.to_str().unwrap();
let hash = hash(
[local_filename, contents_hash.as_str()]
.join(" ")
.into_bytes(),
);
Ok(Self {
path: String::from("./".to_owned() + local_filename),
hash,
size: path.metadata()?.len(),
})
}
}
#[derive(Debug, Serialize, Deserialize)]
pub struct DirNode {
pub path: String,
pub hash: Hash,
pub children: Vec<Node>,
}
impl DirNode {
pub fn from_path(path: &Path, root: &Path) -> Result<Self, NodeError> {
let local_dirname = path.strip_prefix(root)?.to_str().unwrap();
let mut children = Vec::new();
for entry in std::fs::read_dir(path)? {
let child = entry?;
let path = child.path();
if path.is_dir() {
let node = DirNode::from_path(&path, root)?;
children.push(Node::Dir(node));
} else {
let node = FileNode::from_path(&path, root)?;
children.push(Node::File(node));
}
}
let hashes: Vec<String> = children
.iter()
.map(|node| match &node {
Node::Dir(n) => n.hash.clone(),
Node::File(n) => n.hash.clone(),
})
.collect();
let hash = hash(hashes.join(" ").into_bytes());
Ok(Self {
path: String::from("./".to_owned() + local_dirname),
hash,
children,
})
}
}
fn hash(input: Vec<u8>) -> String {
let mut hash = Sha512Trunc256::default();
hash.input(input);
base64::encode(&hash.fixed_result())
}