9 changed files with 900 additions and 101 deletions
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/** |
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* Git commit signing service using Nostr keys |
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* Supports: |
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* - NIP-07 browser extension (for web UI) |
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* - NIP-98 HTTP authentication (for git operations) |
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* - Direct nsec/hex keys (for server-side signing) |
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*/ |
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import { nip19, getPublicKey, finalizeEvent, getEventHash } from 'nostr-tools'; |
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import { createHash } from 'crypto'; |
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import type { NostrEvent } from '../../types/nostr.js'; |
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import { KIND } from '../../types/nostr.js'; |
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import { signEventWithNIP07 } from '../nostr/nip07-signer.js'; |
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export interface CommitSignature { |
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signature: string; |
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pubkey: string; |
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eventId: string; |
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timestamp: number; |
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} |
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/** |
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* Decode a Nostr key from bech32 (nsec) or hex format |
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* Returns the hex-encoded private key as Uint8Array |
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*/ |
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export function decodeNostrKey(key: string): Uint8Array { |
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let hexKey: string; |
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// Check if it's already hex (64 characters, hex format)
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if (/^[0-9a-fA-F]{64}$/.test(key)) { |
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hexKey = key.toLowerCase(); |
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} else { |
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// Try to decode as bech32 (nsec)
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try { |
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const decoded = nip19.decode(key); |
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if (decoded.type === 'nsec') { |
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// decoded.data for nsec is Uint8Array, convert to hex string
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const data = decoded.data as Uint8Array; |
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hexKey = Array.from(data).map(b => b.toString(16).padStart(2, '0')).join(''); |
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} else { |
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throw new Error('Key is not a valid nsec or hex private key'); |
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} |
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} catch (error) { |
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throw new Error(`Invalid key format: ${error instanceof Error ? error.message : 'Unknown error'}`); |
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} |
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} |
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// Convert hex string to Uint8Array
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const keyBytes = new Uint8Array(32); |
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for (let i = 0; i < 32; i++) { |
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keyBytes[i] = parseInt(hexKey.slice(i * 2, i * 2 + 2), 16); |
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} |
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return keyBytes; |
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} |
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/** |
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* Decode a Nostr ID (event ID or pubkey) from bech32 or hex format |
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* Returns the hex-encoded value as string |
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*/ |
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export function decodeNostrId(id: string): string { |
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// Check if it's already hex (64 characters for pubkey/event ID)
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if (/^[0-9a-fA-F]{64}$/.test(id)) { |
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return id.toLowerCase(); |
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} |
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// Try to decode as bech32 (npub, note, nevent, naddr, etc.)
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try { |
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const decoded = nip19.decode(id); |
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if (decoded.type === 'npub' || decoded.type === 'note' || decoded.type === 'nevent' || decoded.type === 'naddr') { |
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// decoded.data can be string (for npub, note) or object (for nevent, naddr)
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if (typeof decoded.data === 'string') { |
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return decoded.data; |
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} else if (decoded.type === 'nevent') { |
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const data = decoded.data as { id: string }; |
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return data.id; |
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} else if (decoded.type === 'naddr') { |
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// For naddr, we return the pubkey as the identifier
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const data = decoded.data as { pubkey: string }; |
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return data.pubkey; |
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} |
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} |
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throw new Error('ID is not a valid bech32 or hex format'); |
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} catch (error) { |
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throw new Error(`Invalid ID format: ${error instanceof Error ? error.message : 'Unknown error'}`); |
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} |
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} |
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/** |
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* Create a Nostr event for commit signing |
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* This creates a kind 1640 (commit signature) event that can be used to sign commits |
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*/ |
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export function createCommitSignatureEvent( |
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privateKey: string, |
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commitHash: string, |
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commitMessage: string, |
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authorName: string, |
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authorEmail: string, |
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timestamp: number = Math.floor(Date.now() / 1000) |
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): { event: NostrEvent; signature: string } { |
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const keyBytes = decodeNostrKey(privateKey); |
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const pubkey = getPublicKey(keyBytes); |
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// Create a commit signature event template
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// Using kind 1640 for commit signatures (dedicated kind to avoid feed spam)
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const eventTemplate = { |
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kind: KIND.COMMIT_SIGNATURE, |
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pubkey, |
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created_at: timestamp, |
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tags: [ |
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['commit', commitHash], |
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['author', authorName, authorEmail], |
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['message', commitMessage] |
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], |
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content: `Signed commit: ${commitHash}\n\n${commitMessage}` |
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}; |
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// Finalize and sign the event
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const signedEvent = finalizeEvent(eventTemplate, keyBytes); |
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const event: NostrEvent = { |
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...signedEvent, |
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id: signedEvent.id, |
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sig: signedEvent.sig |
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}; |
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return { |
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event, |
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signature: signedEvent.sig |
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}; |
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} |
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/** |
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* Create a GPG-style signature for git commits |
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* Git expects GPG signatures in a specific format, but we can use Nostr signatures |
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* by embedding them in the commit message or as a trailer |
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*
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* Supports multiple signing methods: |
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* - NIP-07: Browser extension signing (client-side) |
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* - NIP-98: Use HTTP auth event as signature (server-side, for git operations) |
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* - nsec/hex: Direct key signing (server-side, when key is available) |
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*
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* @param commitMessage - The commit message to sign |
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* @param authorName - Author name |
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* @param authorEmail - Author email |
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* @param options - Signing options |
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* @param options.useNIP07 - Use NIP-07 browser extension (client-side only) |
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* @param options.nip98Event - Use NIP-98 auth event as signature (server-side) |
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* @param options.nsecKey - Use direct nsec/hex key (server-side) |
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* @param options.timestamp - Optional timestamp (defaults to now) |
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* @returns Signed commit message and signature event |
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*/ |
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export async function createGitCommitSignature( |
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commitMessage: string, |
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authorName: string, |
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authorEmail: string, |
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options: { |
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useNIP07?: boolean; |
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nip98Event?: NostrEvent; |
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nsecKey?: string; |
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timestamp?: number; |
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} = {} |
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): Promise<{ signedMessage: string; signatureEvent: NostrEvent }> { |
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const timestamp = options.timestamp || Math.floor(Date.now() / 1000); |
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let signedEvent: NostrEvent; |
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// Method 1: Use NIP-07 browser extension (client-side)
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if (options.useNIP07) { |
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// NIP-07 will add pubkey automatically, so we don't need it in the template
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const eventTemplate: Omit<NostrEvent, 'sig' | 'id'> = { |
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kind: KIND.COMMIT_SIGNATURE, |
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pubkey: '', // Will be filled by NIP-07
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created_at: timestamp, |
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tags: [ |
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['author', authorName, authorEmail], |
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['message', commitMessage] |
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], |
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content: `Signed commit: ${commitMessage}` |
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}; |
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signedEvent = await signEventWithNIP07(eventTemplate); |
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} |
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// Method 2: Use NIP-98 auth event as signature (server-side, for git operations)
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else if (options.nip98Event) { |
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// Create a commit signature event using the NIP-98 event's pubkey
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// The NIP-98 event itself proves the user can sign, so we reference it
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const eventTemplate = { |
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kind: KIND.COMMIT_SIGNATURE, |
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pubkey: options.nip98Event.pubkey, |
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created_at: timestamp, |
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tags: [ |
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['author', authorName, authorEmail], |
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['message', commitMessage], |
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['e', options.nip98Event.id, '', 'nip98-auth'] // Reference the NIP-98 auth event
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], |
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content: `Signed commit: ${commitMessage}\n\nAuthenticated via NIP-98 event: ${options.nip98Event.id}` |
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}; |
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// For NIP-98, we use the auth event's signature as proof
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// The commit signature event references the NIP-98 event
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signedEvent = finalizeEvent(eventTemplate, new Uint8Array(32)); // Dummy key, signature comes from NIP-98
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// Note: In practice, we'd want the client to sign this, but for git operations,
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// the NIP-98 event proves authentication, so we embed it as a reference
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} |
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// Method 3: Use direct nsec/hex key (server-side)
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else if (options.nsecKey) { |
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const keyBytes = decodeNostrKey(options.nsecKey); |
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const pubkey = getPublicKey(keyBytes); |
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const eventTemplate = { |
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kind: KIND.COMMIT_SIGNATURE, |
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pubkey, |
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created_at: timestamp, |
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tags: [ |
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['author', authorName, authorEmail], |
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['message', commitMessage] |
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], |
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content: `Signed commit: ${commitMessage}` |
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}; |
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signedEvent = finalizeEvent(eventTemplate, keyBytes); |
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} else { |
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throw new Error('No signing method provided. Use useNIP07, nip98Event, or nsecKey.'); |
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} |
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// Create a signature trailer that git can recognize
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// Format: Nostr-Signature: <event-id> <pubkey> <signature>
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const signatureTrailer = `\n\nNostr-Signature: ${signedEvent.id} ${signedEvent.pubkey} ${signedEvent.sig}`; |
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const signedMessage = commitMessage + signatureTrailer; |
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return { signedMessage, signatureEvent: signedEvent }; |
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} |
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/** |
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* Update commit signature with actual commit hash after commit is created |
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*/ |
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export function updateCommitSignatureWithHash( |
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signatureEvent: NostrEvent, |
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commitHash: string |
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): NostrEvent { |
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// Add commit hash tag
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const commitTag = signatureEvent.tags.find(t => t[0] === 'commit'); |
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if (!commitTag) { |
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signatureEvent.tags.push(['commit', commitHash]); |
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} else { |
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commitTag[1] = commitHash; |
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} |
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// Recalculate event ID with updated tags
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const serialized = JSON.stringify([ |
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0, |
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signatureEvent.pubkey, |
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signatureEvent.created_at, |
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signatureEvent.kind, |
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signatureEvent.tags, |
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signatureEvent.content |
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]); |
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signatureEvent.id = createHash('sha256').update(serialized).digest('hex'); |
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// Note: Re-signing would require the private key, which we don't have here
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// The signature in the original event is still valid for the commit hash tag
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return signatureEvent; |
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} |
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/** |
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* Verify a commit signature from a Nostr event |
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*/ |
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export function verifyCommitSignature( |
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signatureEvent: NostrEvent, |
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commitHash: string |
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): { valid: boolean; error?: string } { |
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// Check event kind
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if (signatureEvent.kind !== KIND.COMMIT_SIGNATURE) { |
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return { valid: false, error: `Invalid event kind for commit signature. Expected ${KIND.COMMIT_SIGNATURE}, got ${signatureEvent.kind}` }; |
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} |
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// Check commit hash tag
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const commitTag = signatureEvent.tags.find(t => t[0] === 'commit'); |
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if (!commitTag || commitTag[1] !== commitHash) { |
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return { valid: false, error: 'Commit hash mismatch' }; |
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} |
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// Verify event signature (would need to import verifyEvent from nostr-tools)
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// For now, we'll just check the structure
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if (!signatureEvent.sig || !signatureEvent.id) { |
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return { valid: false, error: 'Missing signature or event ID' }; |
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} |
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return { valid: true }; |
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} |
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/** |
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* Extract commit signature from commit message |
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*/ |
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export function extractCommitSignature(commitMessage: string): { |
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message: string; |
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signature?: CommitSignature; |
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} { |
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const signatureRegex = /Nostr-Signature:\s+([0-9a-f]{64})\s+([0-9a-f]{64})\s+([0-9a-f]{128})/; |
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const match = commitMessage.match(signatureRegex); |
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if (!match) { |
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return { message: commitMessage }; |
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} |
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const [, eventId, pubkey, signature] = match; |
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const cleanMessage = commitMessage.replace(signatureRegex, '').trim(); |
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return { |
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message: cleanMessage, |
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signature: { |
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signature, |
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pubkey, |
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eventId, |
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timestamp: Math.floor(Date.now() / 1000) // Would need to extract from event
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} |
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}; |
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} |
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