1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
#[macro_use]
extern crate custom_error;
#[macro_use]
extern crate serde_derive;
use sha2::digest::FixedOutput;
use sha2::{Digest, Sha512Trunc256};
use std::path::{Path, StripPrefixError};
pub type Hash = String;
#[derive(Debug, Serialize, Deserialize)]
#[serde(untagged)]
pub enum Node {
File(FileNode),
Dir(DirNode),
}
custom_error! { pub NodeError
Foo { source: std::io::Error } = @{format!("IO Error: {:?}", source.kind())},
StripPrefixError { source: StripPrefixError } = "could not strip path prefix",
}
#[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: "./".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: "./".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())
}