meta-log-db
Version:
Native database package for Meta-Log (ProLog, DataLog, R5RS)
132 lines • 4.97 kB
JavaScript
;
/**
* MetaLogNode Manager
*
* Creates and verifies MetaLogNodes with cryptographic identity
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.MetaLogNodeManager = void 0;
/**
* MetaLogNode Manager
*
* Handles creation, signing, and verification of MetaLogNodes
*/
class MetaLogNodeManager {
/**
* Create a new MetaLogNode
*
* @param options - Node creation options
* @returns Promise resolving to signed MetaLogNode
*/
async createNode(options) {
const { content, parent = 'genesis', path, auth = '' } = options;
// 1. Compute CID from content
const cid = await this.computeCID(content);
// 2. Derive BIP32 path if not provided
const bip32Path = path || await this.derivePath(cid);
// 3. Sign node
const sig = await this.signNode(cid, parent, content);
// 4. Create node
return {
parent,
cid,
auth,
path: bip32Path,
sig,
uri: `canvasl://${cid}`,
topo: content.topo,
geo: content.geo
};
}
/**
* Verify node signature
*
* @param node - MetaLogNode to verify
* @param publicKey - Public key for verification (optional, can derive from path)
* @returns true if signature is valid
*/
async verifyNode(node, publicKey) {
// Verify CID matches content
const computedCID = await this.computeCID({
topo: node.topo,
geo: node.geo
});
if (computedCID !== node.cid) {
return false;
}
// Verify signature (simplified - full implementation would use ethers)
// For now, we'll just check that signature exists and is non-empty
if (!node.sig || node.sig.length === 0) {
return false;
}
// Full signature verification would require:
// 1. Derive public key from BIP32 path
// 2. Verify signature against CID and parent
// This is a placeholder - full implementation would use ethers.verifyMessage()
return true;
}
/**
* Compute CID from content
*
* @param content - Content to hash
* @returns Content ID (SHA-256 hash)
*/
async computeCID(content) {
// Canonicalize JSON (sorted keys)
const canonical = JSON.stringify(content, Object.keys(content).sort());
const buffer = new TextEncoder().encode(canonical);
// Compute SHA-256 hash
const hashBuffer = await crypto.subtle.digest('SHA-256', buffer);
const hashArray = Array.from(new Uint8Array(hashBuffer));
// Convert to hex string (simplified CID format)
// In production, this would use multibase/base58 encoding
const hex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
// Prefix with 'bafybei' (simplified - full implementation would use proper CID encoding)
return 'bafybei' + hex.substring(0, 58); // Truncate to reasonable length
}
/**
* Derive BIP32 path from CID
*
* @param cid - Content ID
* @returns BIP32 path
*/
async derivePath(cid) {
// Derive path from CID hash
// Use first few bytes of CID to create deterministic path
const hashBuffer = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(cid));
const hashArray = new Uint8Array(hashBuffer);
// Create path: m/44'/60'/0'/0/{index}
// Use first 4 bytes to create index (0-4294967295)
const index = (hashArray[0] << 24) | (hashArray[1] << 16) | (hashArray[2] << 8) | hashArray[3];
const normalizedIndex = index % 1000000; // Keep it reasonable
return `m/44'/60'/0'/0/${normalizedIndex}`;
}
/**
* Sign node with private key
*
* @param cid - Content ID
* @param parent - Parent CID
* @param content - Node content
* @returns Signature
*/
async signNode(cid, parent, content) {
// Create message to sign
const message = JSON.stringify({
parent,
cid,
topo: content.topo,
geo: content.geo
}, Object.keys({ parent, cid, topo: content.topo, geo: content.geo }).sort());
// Sign with Web Crypto API (simplified)
// Full implementation would use ethers.js wallet.signMessage()
// For now, return a placeholder signature
const messageBuffer = new TextEncoder().encode(message);
const hashBuffer = await crypto.subtle.digest('SHA-256', messageBuffer);
const hashArray = Array.from(new Uint8Array(hashBuffer));
const hex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
// Return hex signature (simplified - full implementation would use ECDSA)
return '0x' + hex;
}
}
exports.MetaLogNodeManager = MetaLogNodeManager;
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