feat(rust/signed-doc): CatalystSignedDocument has CIDv1

rust/signed_doc/Cargo.toml

@@ -35,6 +35,12 @@ tracing = "0.1.40"
 thiserror = "2.0.11"
 chrono = "0.4.42"
 
+# CID v1 support
+cid = "0.11.1"
+multihash = { version = "0.19.3", features = ["serde-codec"] }
+sha2 = "0.10"
+multibase = "0.9.2"
+
 [dev-dependencies]
 base64-url = "3.0.0"
 rand = "0.8.5"

rust/signed_doc/src/cid_v1.rs

@@ -0,0 +1,336 @@
+//! CID v1 (Content Identifier version 1) implementation for Catalyst Signed Documents.
+//!
+//! This module provides functionality to generate IPFS-compatible CID v1 identifiers
+//! for CBOR-encoded Catalyst Signed Documents.
+//!
+//! ## CID v1 Structure
+//!
+//! The binary format follows the IPFS specification:
+//! ```text
+//! <cidv1> = <version> || <multicodec> || <multihash>
+//! ```
+//!
+//! Where:
+//! - `version`: varint(1) - CID version 1
+//! - `multicodec`: varint(0x51) - CBOR codec
+//! - `multihash`: varint(0x12) || varint(32) || digest[32] - SHA2-256 multihash
+//!
+//! ## Constraints
+//!
+//! - **Hash function**: Only SHA2-256 is supported (32-byte digest)
+//! - **Codec**: Fixed to CBOR (0x51)
+//! - **Output size**: 36 bytes in binary format
+//!
+//! ## Example
+//!
+//! ```no_run
+//! # use catalyst_signed_doc::CatalystSignedDocument;
+//! # let doc: CatalystSignedDocument = todo!();
+//! let cid_string = doc.to_cid_v1_string()?;
+//! // Result: "bafyrei..." (base32-encoded CID v1)
+//! # Ok::<(), anyhow::Error>(())
+//! ```
+
+use sha2::{Digest, Sha256};
+
+/// CBOR multicodec identifier.
+///
+/// See: <https://github.com/multiformats/multicodec/blob/master/table.csv>
+const CBOR_CODEC: u64 = 0x51;
+
+/// SHA2-256 multihash code.
+const SHA2_256_CODE: u64 = 0x12;
+
+/// Generates a CID v1 for the given CBOR bytes.
+///
+/// # Arguments
+///
+/// * `cbor_bytes` - The CBOR-encoded data to generate a CID for
+///
+/// # Returns
+///
+/// A `cid::Cid` object representing the CID v1
+///
+/// # Errors
+///
+/// Returns an error if multihash construction fails
+pub fn to_cid_v1(cbor_bytes: &[u8]) -> anyhow::Result<cid::Cid> {
+    // Compute SHA2-256 hash
+    let mut hasher = Sha256::new();
+    hasher.update(cbor_bytes);
+    let hash_digest = hasher.finalize();
+
+    // Create multihash from digest using the wrap() API
+    // The generic parameter <64> is the max digest size we support
+    let multihash = multihash::Multihash::<64>::wrap(SHA2_256_CODE, &hash_digest)?;
+
+    // Create CID v1 with CBOR codec
+    let cid = cid::Cid::new_v1(CBOR_CODEC, multihash);
+
+    Ok(cid)
+}
+
+/// Generates a CID v1 and returns it as a multibase-encoded string.
+///
+/// Uses base32 encoding (CID v1 default).
+///
+/// # Arguments
+///
+/// * `cbor_bytes` - The CBOR-encoded data to generate a CID for
+///
+/// # Returns
+///
+/// A base32-encoded CID v1 string (starting with 'b')
+///
+/// # Errors
+///
+/// Returns an error if CID generation fails
+pub fn to_cid_v1_string(cbor_bytes: &[u8]) -> anyhow::Result<String> {
+    let cid = to_cid_v1(cbor_bytes)?;
+    Ok(cid.to_string())
+}
+
+/// Generates a CID v1 and returns it as raw bytes.
+///
+/// Binary format: `<version><multicodec><multihash>`
+///
+/// # Arguments
+///
+/// * `cbor_bytes` - The CBOR-encoded data to generate a CID for
+///
+/// # Returns
+///
+/// A 36-byte vector containing the binary CID v1
+///
+/// # Errors
+///
+/// Returns an error if CID generation fails
+pub fn to_cid_v1_bytes(cbor_bytes: &[u8]) -> anyhow::Result<Vec<u8>> {
+    let cid = to_cid_v1(cbor_bytes)?;
+    Ok(cid.to_bytes())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Builder, CatalystSignedDocument, ContentType};
+
+    /// SHA2-256 digest size in bytes.
+    const SHA2_256_SIZE: usize = 32;
+
+    /// Helper function to create a test CatalystSignedDocument
+    fn create_test_document() -> CatalystSignedDocument {
+        Builder::new()
+            .with_json_metadata(serde_json::json!({
+                "id": "0197f398-9f43-7c23-a576-f765131b81f2",
+                "ver": "0197f398-9f43-7c23-a576-f765131b81f2",
+                "type": "ab7c2428-c353-4331-856e-385b2eb20546",
+                "content-type": ContentType::Json,
+            }))
+            .expect("Should create metadata")
+            .with_json_content(&serde_json::json!({
+                "test": "content"
+            }))
+            .expect("Should set content")
+            .build()
+            .expect("Should build document")
+    }
+
+    /// Test CID v1 generation from a CatalystSignedDocument
+    #[test]
+    fn test_cid_generation_from_document() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let result = to_cid_v1(&cbor_bytes);
+        assert!(result.is_ok(), "CID generation should succeed");
+
+        let cid = result.expect("CID should be valid");
+        assert_eq!(cid.version(), cid::Version::V1);
+        assert_eq!(cid.codec(), CBOR_CODEC);
+    }
+
+    /// Test that binary format is exactly 36 bytes for a CatalystSignedDocument
+    #[test]
+    fn test_binary_format_size_from_document() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid_bytes = to_cid_v1_bytes(&cbor_bytes).expect("CID bytes should be valid");
+
+        assert_eq!(
+            cid_bytes.len(),
+            36,
+            "CID v1 binary format should be exactly 36 bytes"
+        );
+    }
+
+    /// Test determinism: same document produces same CID
+    #[test]
+    fn test_determinism_from_document() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid1 = to_cid_v1(&cbor_bytes).expect("First CID should be valid");
+        let cid2 = to_cid_v1(&cbor_bytes).expect("Second CID should be valid");
+
+        assert_eq!(cid1, cid2, "Same document should produce identical CIDs");
+    }
+
+    /// Test string format starts with 'b' (base32) for a CatalystSignedDocument
+    #[test]
+    fn test_string_format_from_document() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid_string = to_cid_v1_string(&cbor_bytes).expect("CID string should be valid");
+
+        assert!(
+            cid_string.starts_with('b'),
+            "CID v1 base32 string should start with 'b'"
+        );
+    }
+
+    /// Test that multihash has correct SHA2-256 properties
+    #[test]
+    fn test_multihash_properties_from_document() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid = to_cid_v1(&cbor_bytes).expect("CID should be valid");
+        let multihash = cid.hash();
+
+        assert_eq!(
+            multihash.code(),
+            SHA2_256_CODE,
+            "Multihash code should be SHA2-256 (0x12)"
+        );
+        assert_eq!(
+            multihash.size() as usize,
+            SHA2_256_SIZE,
+            "Multihash digest size should be 32 bytes"
+        );
+    }
+
+    /// Test that CID string can be parsed back to a CID object
+    #[test]
+    fn test_cid_string_round_trip() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid_string = to_cid_v1_string(&cbor_bytes).expect("CID string should be valid");
+
+        // Parse the string back to a CID
+        let parsed_cid = cid::Cid::try_from(cid_string.as_str())
+            .expect("CID string should be parseable");
+
+        // Generate CID directly for comparison
+        let original_cid = to_cid_v1(&cbor_bytes).expect("CID should be valid");
+
+        assert_eq!(
+            parsed_cid, original_cid,
+            "Parsed CID should match original CID"
+        );
+    }
+
+    /// Test that different documents produce different CID strings
+    #[test]
+    fn test_different_documents_different_cid_strings() {
+        let doc1 = create_test_document();
+        let doc2 = Builder::new()
+            .with_json_metadata(serde_json::json!({
+                "id": "0197f398-9f43-7c23-a576-f765131b81f3",
+                "ver": "0197f398-9f43-7c23-a576-f765131b81f3",
+                "type": "ab7c2428-c353-4331-856e-385b2eb20546",
+                "content-type": ContentType::Json,
+            }))
+            .expect("Should create metadata")
+            .with_json_content(&serde_json::json!({
+                "different": "content"
+            }))
+            .expect("Should set content")
+            .build()
+            .expect("Should build document");
+
+        let cid_string1 = to_cid_v1_string(&doc1.to_bytes().expect("Should serialize"))
+            .expect("CID string 1 should be valid");
+        let cid_string2 = to_cid_v1_string(&doc2.to_bytes().expect("Should serialize"))
+            .expect("CID string 2 should be valid");
+
+        assert_ne!(
+            cid_string1, cid_string2,
+            "Different documents should produce different CID strings"
+        );
+    }
+
+    /// Test CID string properties (base32 encoding characteristics)
+    #[test]
+    fn test_cid_string_properties() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid_string = to_cid_v1_string(&cbor_bytes).expect("CID string should be valid");
+
+        // Base32 strings start with 'b'
+        assert!(
+            cid_string.starts_with('b'),
+            "CID v1 base32 string should start with 'b'"
+        );
+
+        // Base32 encoding uses lowercase letters and digits 2-7
+        assert!(
+            cid_string.chars().skip(1).all(|c| c.is_ascii_lowercase() || ('2'..='7').contains(&c)),
+            "CID v1 base32 string should only contain lowercase letters and digits 2-7"
+        );
+
+        // Should be non-empty and reasonably sized
+        assert!(
+            cid_string.len() > 10,
+            "CID string should have reasonable length"
+        );
+    }
+
+    /// Test CID string determinism (same document always produces same string)
+    #[test]
+    fn test_cid_string_determinism() {
+        let doc = create_test_document();
+        let cbor_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        let cid_string1 = to_cid_v1_string(&cbor_bytes).expect("First CID string should be valid");
+        let cid_string2 = to_cid_v1_string(&cbor_bytes).expect("Second CID string should be valid");
+
+        assert_eq!(
+            cid_string1, cid_string2,
+            "Same document should always produce the same CID string"
+        );
+    }
+
+    /// Test full round-trip: document -> CID string -> CID -> bytes -> CID
+    #[test]
+    fn test_full_cid_round_trip() {
+        let doc = create_test_document();
+        let original_bytes = doc.to_bytes().expect("Should serialize to CBOR");
+
+        // Convert to CID string
+        let cid_string = to_cid_v1_string(&original_bytes).expect("CID string should be valid");
+
+        // Parse string to CID
+        let cid_from_string = cid::Cid::try_from(cid_string.as_str())
+            .expect("Should parse CID from string");
+
+        // Convert CID to bytes
+        let cid_bytes = cid_from_string.to_bytes();
+
+        // Parse bytes back to CID
+        let cid_from_bytes = cid::Cid::try_from(cid_bytes.as_slice())
+            .expect("Should parse CID from bytes");
+
+        // Convert back to string
+        let final_string = cid_from_bytes.to_string();
+
+        assert_eq!(
+            cid_string, final_string,
+            "Full round-trip should preserve CID string"
+        );
+    }
+}