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amp-cors.js
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amp-cors.js
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/**
* Copyright 2019 The AMP HTML Authors. All Rights Reserved.
*
* 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.
*/
function enableCors(req, res, origin, opt_exposeHeaders) {
res.setHeader('Access-Control-Allow-Credentials', 'true');
if (!origin && req.headers.origin) {
origin = req.headers.origin;
}
if (origin) {
res.setHeader('Access-Control-Allow-Origin', origin);
}
res.setHeader('Access-Control-Expose-Headers',
['AMP-Access-Control-Allow-Source-Origin']
.concat(opt_exposeHeaders || []).join(', '));
if (req.query.__amp_source_origin) {
res.setHeader('AMP-Access-Control-Allow-Source-Origin',
req.query.__amp_source_origin);
}
}
module.exports = enableCors;