next-csrf
Version:
CSRF mitigation library for Next.js
39 lines (35 loc) • 1.4 kB
JavaScript
/**
* Copyright 2020 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.
*/
;
/**
* A sample implementation that does not perform any kind of image optimization, but generates a `srcset` string
* by appending the width to the file name (e.g. image.jpg => image.32w.jpg).
*
* @param {string} src - the image src
* @param {number} width - the required widths (in px)
* @returns {string|undefined} - the image URL or undefined if no image is available in this dimension
*/
const simpleRename = (src, width) => {
// we cannot rename if the image does not have a file extension
const index = src.lastIndexOf('.');
if (index === -1) {
return null;
}
const prefix = src.substring(0, index);
const postfix = src.substring(index, src.length);
return `${prefix}.${width}w${postfix}`;
};
module.exports = simpleRename;