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

#[cfg(feature = "crypto")]
use crate::crypto::Key;
use libipld::block::Block;
use libipld::cid::Cid;
use libipld::codec::{Codec, Decode, Encode};
#[cfg(feature = "crypto")]
use libipld::error::Error;
use libipld::error::Result;
use libipld::ipld::Ipld;
use libipld::multihash::{Code, Multihasher};
#[cfg(feature = "crypto")]
use libipld::raw::RawCodec;
use std::marker::PhantomData;
#[cfg(feature = "crypto")]
use std::sync::Arc;

/// Encoder trait.
pub trait Encoder {
    /// Ipld codec.
    type Codec: Codec;
    /// Hasher.
    type Hash: Multihasher<Code>;

    /// Encodes the value into a block.
    fn encode<T: Encode<Self::Codec>>(&self, value: &T) -> Result<Block>;
}

/// Decoder trait.
pub trait Decoder {
    /// Ipld codec.
    type Codec: Codec;

    /// Decodes the block into a value.
    fn decode<T: Decode<Self::Codec>>(&self, cid: &Cid, data: &[u8]) -> Result<T>;
}

/// Ipld decoder trait.
pub trait IpldDecoder {
    /// Decodes the block into `Ipld`.
    fn decode_ipld(&self, cid: &Cid, data: &[u8]) -> Result<Ipld>;
}

/// Marker trait for encrypted encoders.
pub trait Encrypted {}

/// Generic ipld codec.
#[derive(Clone, Default)]
pub struct GenericCodec<C, H> {
    _marker: PhantomData<(C, H)>,
}

impl<C, H> GenericCodec<C, H> {
    /// Create a new generic codec.
    pub fn new() -> Self {
        Self {
            _marker: PhantomData,
        }
    }
}

impl<C: Codec, H: Multihasher<Code>> Encoder for GenericCodec<C, H> {
    type Codec = C;
    type Hash = H;

    fn encode<T: Encode<C>>(&self, value: &T) -> Result<Block> {
        libipld::block::encode::<C, H, T>(value)
    }
}

impl<C: Codec, H> Decoder for GenericCodec<C, H> {
    type Codec = C;

    fn decode<T: Decode<C>>(&self, cid: &Cid, data: &[u8]) -> Result<T> {
        libipld::block::decode::<C, T>(cid, data)
    }
}

impl<C, H> IpldDecoder for GenericCodec<C, H> {
    fn decode_ipld(&self, cid: &Cid, data: &[u8]) -> Result<Ipld> {
        libipld::block::decode_ipld(cid, data)
    }
}

/// Generic encrypted codec.
#[cfg(feature = "crypto")]
#[derive(Clone)]
pub struct GenericStrobeCodec<C, H> {
    _marker: PhantomData<(C, H)>,
    key: Arc<Key>,
}

#[cfg(feature = "crypto")]
impl<C, H> GenericStrobeCodec<C, H> {
    /// Creates a new generic strobe codec.
    pub fn new(key: Key) -> Self {
        Self {
            _marker: PhantomData,
            key: Arc::new(key),
        }
    }
}

#[cfg(feature = "crypto")]
impl<C: Codec, H: Multihasher<Code>> Encoder for GenericStrobeCodec<C, H> {
    type Codec = C;
    type Hash = H;

    fn encode<T: Encode<C>>(&self, value: &T) -> Result<Block> {
        let data = C::encode(value).map_err(|e| Error::CodecError(Box::new(e)))?;
        let ct = crate::crypto::encrypt(&self.key, C::CODE, &data)
            .map_err(|e| Error::CodecError(Box::new(e)))?;
        libipld::block::encode::<RawCodec, H, _>(&ct)
    }
}

#[cfg(feature = "crypto")]
impl<C: Codec, H> Decoder for GenericStrobeCodec<C, H> {
    type Codec = C;

    fn decode<T: Decode<C>>(&self, cid: &Cid, data: &[u8]) -> Result<T> {
        let ct = libipld::block::decode::<RawCodec, Box<[u8]>>(cid, data)?;
        let (codec, data) =
            crate::crypto::decrypt(&self.key, ct).map_err(|e| Error::CodecError(Box::new(e)))?;
        libipld::block::raw_decode::<C, T>(codec, &data)
    }
}

#[cfg(feature = "crypto")]
impl<C, H> IpldDecoder for GenericStrobeCodec<C, H> {
    fn decode_ipld(&self, cid: &Cid, data: &[u8]) -> Result<Ipld> {
        let ct = libipld::block::decode::<RawCodec, Box<[u8]>>(cid, data)?;
        let (codec, data) =
            crate::crypto::decrypt(&self.key, ct).map_err(|e| Error::CodecError(Box::new(e)))?;
        libipld::block::raw_decode_ipld(codec, &data)
    }
}

#[cfg(feature = "crypto")]
impl<C, H> Encrypted for GenericStrobeCodec<C, H> {}