imdl 0.1.16

📦 A 40' shipping container for the internet
Documentation 
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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use crate::common::*;

#[derive(Debug, Eq, PartialEq, Copy, Clone)]
pub(crate) struct Infohash {
  inner: Sha1Digest,
}

impl Infohash {
  pub(crate) fn from_input(input: &Input) -> Result<Infohash, Error> {
    let value = Value::from_bencode(&input.data).map_err(|error| Error::MetainfoDecode {
      input: input.source.clone(),
      error,
    })?;

    match value {
      Value::Dict(metainfo) => {
        let info = metainfo
          .iter()
          .find(|pair: &(&Cow<[u8]>, &Value)| pair.0.as_ref() == b"info")
          .ok_or_else(|| Error::MetainfoValidate {
            input: input.source.clone(),
            source: MetainfoError::InfoMissing,
          })?
          .1;

        if let Value::Dict(_) = info {
          let encoded = info.to_bencode().map_err(|error| {
            Error::internal(format!("Failed to re-encode info dictionary: {error}"))
          })?;

          Ok(Self::from_bencoded_info_dict(&encoded))
        } else {
          Err(Error::MetainfoValidate {
            input: input.source.clone(),
            source: MetainfoError::InfoType,
          })
        }
      }
      _ => Err(Error::MetainfoValidate {
        input: input.source.clone(),
        source: MetainfoError::Type,
      }),
    }
  }

  pub(crate) fn from_bencoded_info_dict(info: &[u8]) -> Infohash {
    Infohash {
      inner: Sha1Digest::from_data(info),
    }
  }

  #[cfg(test)]
  pub(crate) fn load(path: &Path) -> Result<Infohash, Error> {
    let input = Input::from_path(path)?;
    Self::from_input(&input)
  }
}

impl From<Sha1Digest> for Infohash {
  fn from(inner: Sha1Digest) -> Self {
    Self { inner }
  }
}

impl From<[u8; 20]> for Infohash {
  fn from(bytes: [u8; 20]) -> Self {
    Infohash {
      inner: Sha1Digest::from_bytes(bytes),
    }
  }
}

impl From<Infohash> for [u8; 20] {
  fn from(infohash: Infohash) -> Self {
    infohash.inner.bytes()
  }
}

impl From<Infohash> for Sha1Digest {
  fn from(infohash: Infohash) -> Sha1Digest {
    infohash.inner
  }
}

impl Display for Infohash {
  fn fmt(&self, f: &mut Formatter) -> fmt::Result {
    write!(f, "{}", self.inner)
  }
}

#[cfg(test)]
mod tests {
  use super::*;

  #[test]
  fn load_invalid() {
    let tempdir = temptree! {
      foo: "x",
    };

    let path = tempdir.path().join("foo");

    assert_matches!(
      Infohash::load(&path),
      Err(Error::MetainfoDecode{input, .. })
      if input == path
    );
  }

  #[test]
  fn load_wrong_type() {
    let tempdir = temptree! {
      foo: "i0e",
    };

    let path = tempdir.path().join("foo");

    assert_matches!(
      Infohash::load(&path),
      Err(Error::MetainfoValidate{input, source: MetainfoError::Type})
      if input == path
    );
  }

  #[test]
  fn load_no_info() {
    let tempdir = temptree! {
      foo: "de",
    };

    let path = tempdir.path().join("foo");

    assert_matches!(
      Infohash::load(&path),
      Err(Error::MetainfoValidate{input, source: MetainfoError::InfoMissing})
      if input == path
    );
  }

  #[test]
  fn load_info_type() {
    let tempdir = temptree! {
      foo: "d4:infoi0ee",
    };

    let path = tempdir.path().join("foo");

    assert_matches!(
      Infohash::load(&path),
      Err(Error::MetainfoValidate{input, source: MetainfoError::InfoType})
      if input == path
    );
  }
}