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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170

// This file is part of radicle-surf
// <https://github.com/radicle-dev/radicle-surf>
//
// Copyright (C) 2019-2020 The Radicle Team <dev@radicle.xyz>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3 or
// later as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

//! Represents git object type 'blob', i.e. actual file contents.
//! See git [doc](https://git-scm.com/book/en/v2/Git-Internals-Git-Objects) for more details.

use std::ops::Deref;

use base64::Engine;
use radicle_git_ext::Oid;
#[cfg(feature = "serde")]
use serde::{
    ser::{SerializeStruct as _, Serializer},
    Serialize,
};

use crate::Commit;

/// Represents a git blob object.
///
/// The type parameter `T` can be fulfilled by [`BlobRef`] or a
/// [`Vec`] of bytes.
pub struct Blob<T> {
    id: Oid,
    is_binary: bool,
    commit: Commit,
    content: T,
}

impl<T> Blob<T> {
    pub fn object_id(&self) -> Oid {
        self.id
    }

    pub fn is_binary(&self) -> bool {
        self.is_binary
    }

    /// Returns the commit that created this blob.
    pub fn commit(&self) -> &Commit {
        &self.commit
    }

    pub fn content(&self) -> &[u8]
    where
        T: AsRef<[u8]>,
    {
        self.content.as_ref()
    }

    pub fn size(&self) -> usize
    where
        T: AsRef<[u8]>,
    {
        self.content.as_ref().len()
    }
}

impl<'a> Blob<BlobRef<'a>> {
    /// Returns the [`Blob`] wrapping around an underlying [`git2::Blob`].
    pub(crate) fn new(id: Oid, git2_blob: git2::Blob<'a>, commit: Commit) -> Self {
        let is_binary = git2_blob.is_binary();
        let content = BlobRef { inner: git2_blob };
        Self {
            id,
            is_binary,
            content,
            commit,
        }
    }

    /// Converts into a `Blob` with owned content bytes.
    pub fn to_owned(&self) -> Blob<Vec<u8>> {
        Blob {
            id: self.id,
            content: self.content.to_vec(),
            commit: self.commit.clone(),
            is_binary: self.is_binary,
        }
    }
}

/// Represents a blob with borrowed content bytes.
pub struct BlobRef<'a> {
    pub(crate) inner: git2::Blob<'a>,
}

impl<'a> BlobRef<'a> {
    pub fn id(&self) -> Oid {
        self.inner.id().into()
    }
}

impl AsRef<[u8]> for BlobRef<'_> {
    fn as_ref(&self) -> &[u8] {
        self.inner.content()
    }
}

impl Deref for BlobRef<'_> {
    type Target = [u8];

    fn deref(&self) -> &Self::Target {
        self.inner.content()
    }
}

#[cfg(feature = "serde")]
impl<T> Serialize for Blob<T>
where
    T: AsRef<[u8]>,
{
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        const FIELDS: usize = 4;
        let mut state = serializer.serialize_struct("Blob", FIELDS)?;
        state.serialize_field("id", &self.id)?;
        state.serialize_field("binary", &self.is_binary())?;

        let bytes = self.content.as_ref();
        match std::str::from_utf8(bytes) {
            Ok(s) => state.serialize_field("content", s)?,
            Err(_) => {
                let encoded = base64::prelude::BASE64_STANDARD.encode(bytes);
                state.serialize_field("content", &encoded)?
            }
        };
        state.serialize_field("lastCommit", &self.commit)?;
        state.end()
    }
}

#[cfg(feature = "serde")]
impl<'a> Serialize for BlobRef<'a> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        const FIELDS: usize = 3;
        let mut state = serializer.serialize_struct("BlobRef", FIELDS)?;
        state.serialize_field("id", &self.id())?;
        state.serialize_field("binary", &self.inner.is_binary())?;

        let bytes = self.as_ref();
        match std::str::from_utf8(bytes) {
            Ok(s) => state.serialize_field("content", s)?,
            Err(_) => {
                let encoded = base64::prelude::BASE64_STANDARD.encode(bytes);
                state.serialize_field("content", &encoded)?
            }
        };
        state.end()
    }
}