shrike 0.1.1

AT Protocol library for Rust
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
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249

use crate::cbor::{Cid, Codec};

use crate::sync::{DownloadedRepo, SyncError};

/// Verify all blocks in a downloaded repository by recomputing each CID.
///
/// For each block, the CID is recomputed using both the DRISL (DAG-CBOR) and
/// Raw codecs. If neither matches the stored CID, verification fails.
pub fn verify_blocks(repo: &DownloadedRepo) -> Result<(), SyncError> {
    for block in &repo.blocks {
        let drisl_cid = Cid::compute(Codec::Drisl, &block.data);
        let raw_cid = Cid::compute(Codec::Raw, &block.data);
        if block.cid != drisl_cid && block.cid != raw_cid {
            return Err(SyncError::Verification(format!(
                "CID mismatch for block {}: computed (drisl={}, raw={})",
                block.cid, drisl_cid, raw_cid
            )));
        }
    }
    Ok(())
}

#[cfg(test)]
#[allow(
    clippy::unwrap_used,
    clippy::expect_used,
    clippy::panic,
    clippy::unreachable
)]
mod tests {
    use crate::cbor::{Cid, Codec};
    use crate::syntax::{Did, TidClock};

    use super::*;
    use crate::sync::DownloadedRepo;

    /// Build a minimal signed commit for use in tests.
    fn make_test_commit() -> crate::repo::Commit {
        use crate::crypto::P256SigningKey;
        use crate::syntax::{Nsid, RecordKey};

        let sk = P256SigningKey::generate();
        let did = Did::try_from("did:plc:test123456789abcdefghij").unwrap();
        let clock = TidClock::new(0).unwrap();
        let mut repo = crate::repo::Repo::new(did, clock);
        let col = Nsid::try_from("app.bsky.feed.post").unwrap();
        repo.create(&col, &RecordKey::try_from("a").unwrap(), b"\xa0")
            .unwrap();
        repo.commit(&sk).unwrap()
    }

    #[test]
    fn verify_blocks_valid() {
        let blocks: Vec<crate::car::Block> = (0..3)
            .map(|i| {
                let data = format!("block {i}").into_bytes();
                crate::car::Block {
                    cid: Cid::compute(Codec::Raw, &data),
                    data,
                }
            })
            .collect();

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        verify_blocks(&repo).unwrap();
    }

    #[test]
    fn verify_blocks_drisl_codec() {
        let blocks: Vec<crate::car::Block> = (0..3)
            .map(|i| {
                let data = format!("drisl block {i}").into_bytes();
                crate::car::Block {
                    cid: Cid::compute(Codec::Drisl, &data),
                    data,
                }
            })
            .collect();

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        verify_blocks(&repo).unwrap();
    }

    #[test]
    fn verify_blocks_corrupt_fails() {
        let mut data = b"original".to_vec();
        let cid = Cid::compute(Codec::Raw, &data);
        data[0] = 0xFF; // corrupt the data after recording the CID
        let blocks = vec![crate::car::Block { cid, data }];

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        assert!(verify_blocks(&repo).is_err());
    }

    #[test]
    fn verify_blocks_empty() {
        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks: vec![],
        };
        verify_blocks(&repo).unwrap();
    }

    #[test]
    fn verify_blocks_second_block_corrupt_fails() {
        let good_data = b"good block".to_vec();
        let good_cid = Cid::compute(Codec::Raw, &good_data);

        let mut bad_data = b"bad block".to_vec();
        let bad_cid = Cid::compute(Codec::Raw, &bad_data);
        bad_data[0] = 0xAB; // corrupt after CID is recorded

        let blocks = vec![
            crate::car::Block {
                cid: good_cid,
                data: good_data,
            },
            crate::car::Block {
                cid: bad_cid,
                data: bad_data,
            },
        ];

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        assert!(verify_blocks(&repo).is_err());
    }

    // --- Mixed codecs (some Drisl, some Raw) ---

    #[test]
    fn verify_blocks_mixed_codecs() {
        let blocks: Vec<crate::car::Block> = (0..6)
            .map(|i| {
                let data = format!("mixed block {i}").into_bytes();
                // Alternate between Raw and Drisl codecs.
                let codec = if i % 2 == 0 { Codec::Raw } else { Codec::Drisl };
                crate::car::Block {
                    cid: Cid::compute(codec, &data),
                    data,
                }
            })
            .collect();

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        verify_blocks(&repo).unwrap();
    }

    // --- Large block set (50+ blocks) ---

    #[test]
    fn verify_blocks_large_set() {
        let blocks: Vec<crate::car::Block> = (0..55)
            .map(|i| {
                let data = format!("large set block {i:04}").into_bytes();
                crate::car::Block {
                    cid: Cid::compute(Codec::Raw, &data),
                    data,
                }
            })
            .collect();

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        verify_blocks(&repo).unwrap();
    }

    // --- Single block ---

    #[test]
    fn verify_blocks_single_block_raw() {
        let data = b"just one block".to_vec();
        let cid = Cid::compute(Codec::Raw, &data);
        let blocks = vec![crate::car::Block { cid, data }];

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        verify_blocks(&repo).unwrap();
    }

    #[test]
    fn verify_blocks_single_block_drisl() {
        let data = b"just one drisl block".to_vec();
        let cid = Cid::compute(Codec::Drisl, &data);
        let blocks = vec![crate::car::Block { cid, data }];

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        verify_blocks(&repo).unwrap();
    }

    // --- Verification error message includes CID info ---

    #[test]
    fn verify_blocks_error_message_contains_cid() {
        let mut data = b"corrupt me".to_vec();
        let cid = Cid::compute(Codec::Raw, &data);
        data[0] ^= 0xFF;
        let blocks = vec![crate::car::Block { cid, data }];

        let commit = make_test_commit();
        let repo = DownloadedRepo {
            did: Did::try_from("did:plc:test123456789abcdefghij").unwrap(),
            commit,
            blocks,
        };
        let err = verify_blocks(&repo).unwrap_err();
        let msg = err.to_string();
        assert!(msg.contains("verification failed"), "got: {msg}");
    }
}