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/**!
 * koa-lusca - lib/cto.js
 *
 * Copyright(c) 2014 - 2015 fengmk2 and other contributors.
 * MIT Licensed
 *
 * Authors:
 *   fengmk2 <fengmk2@gmail.com> (http://fengmk2.github.com)
 */

/*───────────────────────────────────────────────────────────────────────────*\
│  Copyright (C) 2014 eBay Software Foundation                                │
│                                                                             │
│hh ,'""`.                                                                    │
│  / _  _ \  Licensed under the Apache License, Version 2.0 (the "License");  │
│  |(@)(@)|  you may not use this file except in compliance with the License. │
│  )  __  (  You may obtain a copy of the License at                          │
│ /,'))((`.\                                                                  │
│(( ((  )) ))    http://www.apache.org/licenses/LICENSE-2.0                   │
│ `\ `)(' /'                                                                  │
│                                                                             │
│   Unless required by applicable law or agreed to in writing, software       │
│   distributed under the License is distributed on an "AS IS" BASIS,         │
│   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  │
│   See the License for the specific language governing permissions and       │
│   limitations under the License.                                            │
\*───────────────────────────────────────────────────────────────────────────*/

'use strict';

/**
 * Module dependencies.
 */

var assert = require('assert');

/**
 * X-Content-Type-Options
 * http://blogs.msdn.com/b/ie/archive/2008/09/02/ie8-security-part-vi-beta-2-update.aspx
 * @param {Object} options
 *   - value {String} "nosniff" or not
 */
module.exports = function (options) {
  if (typeof options === 'string') {
    options = {
      value: options
    };
  }
  options = options || {};
  var value = options.value;
  assert(value && typeof value === 'string', 'options.value should be vaild string, like "nosniff"');

return function* cto(next) {
    this.set('X-Content-Type-Options', value);
    yield* next;
  };
};