104 lines
3.2 KiB
Bash
Executable file
104 lines
3.2 KiB
Bash
Executable file
#!/bin/bash
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# generate-proof.sh - Generate OpenTimestamp proof for a git commit
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# Usage: generate-proof.sh <commit-hash> [output-file]
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set -e
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COMMIT_HASH="${1:-}"
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OUTPUT_FILE="${2:-.ots/proof.ots}"
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if [ -z "$COMMIT_HASH" ]; then
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echo "Error: commit hash required" >&2
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echo "Usage: $0 <commit-hash> [output-file]" >&2
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exit 1
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fi
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# Ensure .ots directory exists
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mkdir -p "$(dirname "$OUTPUT_FILE")"
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# Function to generate proof using ots CLI
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generate_with_ots_cli() {
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local hash="$1"
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local output="$2"
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# Create a temporary file with the hash (convert hex to binary)
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local temp_file=$(mktemp)
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# Use python3 for hex to binary conversion (more portable than xxd)
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python3 -c "import sys; sys.stdout.buffer.write(bytes.fromhex('$hash'))" > "$temp_file"
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# Generate timestamp
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ots stamp "$temp_file" -o "$output"
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# Cleanup
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rm -f "$temp_file"
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echo "Generated proof with ots CLI: $output"
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}
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# Function to generate proof using opentimestamps-nodejs
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generate_with_node() {
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local hash="$1"
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local output="$2"
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# Use nodejs opentimestamps library
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# This requires @opentimestamps/ots to be installed globally
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node -e "
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const ots = require('@opentimestamps/ots');
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const fs = require('fs');
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const crypto = require('crypto');
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const hash = '$hash';
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const output = '$output';
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// Convert hex hash to buffer
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const hashBuffer = Buffer.from(hash, 'hex');
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// Create timestamp
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ots.Timestamp.hash(hashBuffer).then(timestamp => {
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// In a real implementation, this would contact the calendar server
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// For now, we create a minimal proof structure
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console.log('Warning: nodejs fallback creates local proof only');
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console.log('Install ots CLI for full functionality: https://github.com/opentimestamps/opentimestamps-client');
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// Create a simple proof file (this is a placeholder - real impl needs calendar)
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const proof = {
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hash: hash,
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timestamp: new Date().toISOString(),
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status: 'pending'
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};
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fs.writeFileSync(output, JSON.stringify(proof, null, 2));
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console.log('Generated local proof: ' + output);
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}).catch(err => {
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console.error('Error generating timestamp:', err);
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process.exit(1);
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});
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"
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}
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# Check if ots CLI is available
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if command -v ots &> /dev/null; then
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echo "Using ots CLI..."
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generate_with_ots_cli "$COMMIT_HASH" "$OUTPUT_FILE"
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elif command -v node &> /dev/null && node -e "require('@opentimestamps/ots')" &> /dev/null; then
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echo "Using opentimestamps-nodejs fallback..."
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generate_with_node "$COMMIT_HASH" "$OUTPUT_FILE"
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else
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echo "Error: Neither ots CLI nor @opentimestamps/ots node package found" >&2
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echo "Install one of:" >&2
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echo " - ots CLI: https://github.com/opentimestamps/opentimestamps-client" >&2
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echo " - Node package: npm install -g @opentimestamps/ots" >&2
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exit 1
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fi
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# Append previous commit hash to the proof file for chaining
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if [ -f "$OUTPUT_FILE" ]; then
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PREV_COMMIT=$(git rev-parse HEAD^1 2>/dev/null || echo "")
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if [ -n "$PREV_COMMIT" ]; then
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echo "" >> "$OUTPUT_FILE"
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echo "# Previous commit: $PREV_COMMIT" >> "$OUTPUT_FILE"
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fi
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fi
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echo "Proof generated for commit: $COMMIT_HASH"
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