XeNote/.yarn/unplugged/@ampproject-toolbox-optimizer-virtual-871245ee15/node_modules/@ampproject/toolbox-optimizer/lib/fetchImageDimensions.js
canburaks b23e3ff508 ...
2021-05-17 04:16:19 +03:00

63 lines
1.7 KiB
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.
*/
'use strict';
const isDependencyInstalled = require('./isDependencyInstalled');
const MATCH_ABSOLUTE_URL = /^https?:\/\/|^\/\//i;
function fetchImageDimensions(pathOrUrl) {
if (MATCH_ABSOLUTE_URL.test(pathOrUrl)) {
return fetchImageDimensionsFromUrl(pathOrUrl);
}
return fetchImageDimensionsFromFile(pathOrUrl);
}
function fetchImageDimensionsFromUrl(url) {
return probe(url);
}
async function fetchImageDimensionsFromFile(path) {
// AMP Optimizer might run in a browser
if (!isDependencyInstalled('fs')) {
throw new Error('No access to the file system');
}
const fs = require('fs');
if (!fs.existsSync(path)) {
throw new Error('Could not resolve file: ' + path);
}
const stream = fs.createReadStream(path);
try {
return await probe(stream);
} finally {
stream.destroy();
}
}
function probe(input) {
if (!isDependencyInstalled('probe-image-size')) {
throw new Error('Missing optional dependency: probe-image-size');
}
return require('probe-image-size')(input);
}
module.exports = {
fetchImageDimensions,
fetchImageDimensionsFromFile,
fetchImageDimensionsFromUrl,
};