Initial commit: Git OpenTimestamp hooks skill

2026-03-08 00:12:45 +01:00 · 2026-03-08 00:12:45 +01:00 · eec64d16c6
commit eec64d16c6
13 changed files with 1145 additions and 0 deletions
--- a/scripts/generate-proof.sh
+++ b/scripts/generate-proof.sh
@ -0,0 +1,114 @@
+#!/bin/bash
+# generate-proof.sh - Generate OpenTimestamp proof for a git commit
+# Usage: generate-proof.sh <commit-hash> [output-file]
+
+set -e
+
+COMMIT_HASH="${1:-}"
+OUTPUT_FILE="${2:-.ots/proof.ots}"
+
+if [ -z "$COMMIT_HASH" ]; then
+    echo "Error: commit hash required" >&2
+    echo "Usage: $0 <commit-hash> [output-file]" >&2
+    exit 1
+fi
+
+# Ensure .ots directory exists
+mkdir -p "$(dirname "$OUTPUT_FILE")"
+
+# Function to generate proof using ots CLI
+generate_with_ots_cli() {
+    local hash="$1"
+    local output="$2"
+    
+    # Create a temporary file with the hash (convert hex to binary)
+    local temp_file=$(mktemp)
+    local temp_ots="${temp_file}.ots"
+    
+    # Use python3 for hex to binary conversion (more portable than xxd)
+    python3 -c "import sys; sys.stdout.buffer.write(bytes.fromhex('$hash'))" > "$temp_file"
+    
+    # Generate timestamp - ots creates .ots file alongside the original
+    ots stamp "$temp_file"
+    
+    # Move the generated .ots file to the desired location
+    if [ -f "$temp_ots" ]; then
+        mkdir -p "$(dirname "$output")"
+        mv "$temp_ots" "$output"
+        echo "Generated proof with ots CLI: $output"
+    else
+        echo "Error: ots did not generate proof file" >&2
+        rm -f "$temp_file"
+        exit 1
+    fi
+    
+    # Cleanup
+    rm -f "$temp_file"
+}
+
+# Function to generate proof using opentimestamps-nodejs
+generate_with_node() {
+    local hash="$1"
+    local output="$2"
+    
+    # Use nodejs opentimestamps library
+    # This requires @opentimestamps/ots to be installed globally
+    node -e "
+const ots = require('@opentimestamps/ots');
+const fs = require('fs');
+const crypto = require('crypto');
+
+const hash = '$hash';
+const output = '$output';
+
+// Convert hex hash to buffer
+const hashBuffer = Buffer.from(hash, 'hex');
+
+// Create timestamp
+ots.Timestamp.hash(hashBuffer).then(timestamp => {
+    // In a real implementation, this would contact the calendar server
+    // For now, we create a minimal proof structure
+    console.log('Warning: nodejs fallback creates local proof only');
+    console.log('Install ots CLI for full functionality: https://github.com/opentimestamps/opentimestamps-client');
+    
+    // Create a simple proof file (this is a placeholder - real impl needs calendar)
+    const proof = {
+        hash: hash,
+        timestamp: new Date().toISOString(),
+        status: 'pending'
+    };
+    
+    fs.writeFileSync(output, JSON.stringify(proof, null, 2));
+    console.log('Generated local proof: ' + output);
+}).catch(err => {
+    console.error('Error generating timestamp:', err);
+    process.exit(1);
+});
+"
+}
+
+# Check if ots CLI is available
+if command -v ots &> /dev/null; then
+    echo "Using ots CLI..."
+    generate_with_ots_cli "$COMMIT_HASH" "$OUTPUT_FILE"
+elif command -v node &> /dev/null && node -e "require('@opentimestamps/ots')" &> /dev/null; then
+    echo "Using opentimestamps-nodejs fallback..."
+    generate_with_node "$COMMIT_HASH" "$OUTPUT_FILE"
+else
+    echo "Error: Neither ots CLI nor @opentimestamps/ots node package found" >&2
+    echo "Install one of:" >&2
+    echo "  - ots CLI: https://github.com/opentimestamps/opentimestamps-client" >&2
+    echo "  - Node package: npm install -g @opentimestamps/ots" >&2
+    exit 1
+fi
+
+# Get previous commit hash for chaining (before appending to proof file)
+PREV_COMMIT=$(git rev-parse HEAD^1 2>/dev/null || echo "")
+
+# Store previous commit hash in a separate metadata file for chaining
+if [ -n "$PREV_COMMIT" ]; then
+    echo "$PREV_COMMIT" > "$(dirname "$OUTPUT_FILE")/prev-commit.txt"
+    echo "Chaining info saved: $PREV_COMMIT"
+fi
+
+echo "Proof generated for commit: $COMMIT_HASH"