Add local user admin tool

admin

+#!/usr/bin/env node
+
+'use strict';
+
+var program = require('commander'),
+    safe = require('safetydance'),
+    bcrypt = require('bcryptjs'),
+    path = require('path');
+
+function exit(error) {
+    if (error) console.error(error);
+    process.exit(error ? 1 : 0);
+}
+
+var LOCAL_AUTH_FILE = path.resolve(process.env.LOCAL_AUTH_FILE || './.users.json');
+
+console.log('Using local auth file: ', LOCAL_AUTH_FILE);
+
+function addUser(options) {
+    if (!options.username) exit('missing --username');
+    if (!options.password) exit('missing --password');
+
+    var users = safe.require(LOCAL_AUTH_FILE);
+    if (!users) users = {};
+    if (users[options.username]) exit('User already exists');
+
+    bcrypt.hash(options.password, 8, function(error, hash) {
+        users[options.username] = { username: options.username, passwordHash: hash };
+        safe.fs.writeFileSync(LOCAL_AUTH_FILE, JSON.stringify(users, null, 4));
+
+        console.log('Done.');
+    });
+}
+
+function editUser(options) {
+    if (!options.username) exit('missing --username');
+    if (!options.password) exit('missing --password');
+
+    var users = safe.require(LOCAL_AUTH_FILE);
+    if (!users) users = {};
+    if (!users[options.username]) exit('No such user');
+
+    bcrypt.hash(options.password, 8, function(error, hash) {
+        users[options.username] = { username: options.username, passwordHash: hash };
+        safe.fs.writeFileSync(LOCAL_AUTH_FILE, JSON.stringify(users, null, 4));
+
+        console.log('Done.');
+    });
+}
+
+function delUser(options) {
+    if (!options.username) exit('missing --username');
+
+    var users = safe.require(LOCAL_AUTH_FILE);
+    if (!users) exit('No such user');
+
+    if (!users[options.username]) exit('No such user');
+
+    delete users[options.username];
+    safe.fs.writeFileSync(LOCAL_AUTH_FILE, JSON.stringify(users, null, 4));
+
+    console.log('Done.');
+}
+
+function listUsers() {
+    var users = safe.require(LOCAL_AUTH_FILE);
+    if (!users) exit('No users. Use `admin user-add` to add some.');
+
+    console.log(users);
+}
+
+program.version('0.1.0');
+
+program.command('user-add')
+    .description('Add local user')
+    .option('-u --username <username>', 'New username')
+    .option('-p --password <password>', 'New password')
+    .action(addUser);
+
+program.command('user-edit')
+    .description('Edit local user')
+    .option('-u --username <username>', 'Username')
+    .option('-p --password <password>', 'New password')
+    .action(editUser);
+
+program.command('user-del')
+    .description('Delete local user')
+    .option('-u --username <username>', 'Username')
+    .action(delUser);
+
+program.command('users')
+    .description('List local users')
+    .action(listUsers);
+
+program.parse(process.argv);
+
+if (!process.argv.slice(2).length) {
+    program.outputHelp();
+} else { // https://github.com/tj/commander.js/issues/338
+    var knownCommand = program.commands.some(function (command) { return command._name === process.argv[2]; });
+    if (!knownCommand) {
+        console.error('Unknown command: ' + process.argv[2]);
+        process.exit(1);
+    }
+}