vouchsafe/src/bin/create_vouchsafe_id.mjs

Vouchsafe Decentralized Identity and Trust Verification module

#!/usr/bin/env node

import fs from 'fs';
import path from 'path';
import { Command } from 'commander';
import { createVouchsafeIdentity, createVouchsafeIdentityFromKeypair } from '../index.mjs';

const program = new Command();

function toPem(label, base64Key) {
    const lines = base64Key.match(/.{1,64}/g).join('\n');
    return `-----BEGIN ${label}-----\n${lines}\n-----END ${label}-----\n`;
}

let status = function() {
    console.error(...arguments);
};

program.name('create-vouchsafe-id')
    .description('Create a new Vouchsafe identity with associated keypair.\n\n' +
        'By default creates a new keypair. To use an existing\n' +
        'keypair, use the --public and --private to provide them');

program
    .option('-l, --label <label>', 'Identity label (required)')
    .option('-s, --separate', 'Output in separate files instead of json')
    .option('-q, --quiet', 'Do not output status messages')
    .option('-o, --output <filename>', 'output filename (or prefix in separate files mode)')
    .option('--public <filename>', 'existing public key PEM file')
    .option('--private <filename>', 'existing private key PEM file')

program.parse(process.argv);

const options = program.opts();
const label = options.label;
const keyPrefix = options.output || label;

if (typeof label == 'undefined') {
    status('!!! Identity label (-l label) is required\n');
    program.help();
    process.exit();
}

if (label.length < 3) {
    status('Label must be at least 3 characters in length');
    process.exit();
}

if (options.quiet) {
    // override the status function if we are told to be quiet
    status = function() {
        // do nothing
    };
}

function readPemFile(filename) {
    const contents = fs.readFileSync(filename, 'utf8');
    return contents.replace(/^-----BEGIN .*?-----\n|\n-----END .*?-----\n?/g, '').replace(/\n/g, '');
}

function writeFile(path_or_handle, data, encoding) {
    let out = path_or_handle;
    let type = 'handle';
    if (typeof path_or_handle == 'string') {
        out = fs.createWriteStream(path_or_handle, {
            encoding
        });
        type = 'file'
    }
    out.write(data);
    if (type == 'file') {
        out.end();
    }
}

try {
    let identity;
    if (options.public && options.private) {
        const pubKey = readPemFile(options.public);
        const privKey = readPemFile(options.private);
        identity = await createVouchsafeIdentityFromKeypair(label, { publicKey: pubKey, privateKey: privKey });
    } else {
        identity = await createVouchsafeIdentity(label);
    }

    const pubPem = toPem('PUBLIC KEY', identity.keypair.publicKey);
    const privPem = toPem('PRIVATE KEY', identity.keypair.privateKey);

    status(`Created identity: ${identity.urn}`);
    if (!options.separate) {
        let json_output = JSON.stringify(identity, undefined, 4);
        let output_filename = options.output || label + '.json';
        if (output_filename == '-') {
            output_filename = process.stdout;
        }
        await writeFile(output_filename, json_output, 'utf8');

        if (options.output != '-') {
            status(`Saved to: ${output_filename}`);
        }
    } else {
        let urnFilename = `${keyPrefix}.urn`;
        let pubKeyFilename = `${keyPrefix}.public.pem`;
        let privateKeyFilename = `${keyPrefix}.private.pem`;
        if (keyPrefix == '-') {
            urnFilename = process.stdout;
            pubKeyFilename = process.stdout;
            privateKeyFilename = process.stdout;
        }
        await writeFile(urnFilename, identity.urn + '\n', 'utf8');
        await writeFile(privateKeyFilename, privPem, 'utf8');
        await writeFile(pubKeyFilename, pubPem, 'utf8');

        if (keyPrefix != '-') {
            status(`Saved to: ${keyPrefix}.urn, ${keyPrefix}.private.pem and ${keyPrefix}.public.pem `);
        }
    }
} catch (err) {
    status('Error:', err);
    process.exit(1);
}