63 lines
1.7 KiB
JavaScript
63 lines
1.7 KiB
JavaScript
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/**
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* Copyright 2020 The AMP HTML Authors. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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const isDependencyInstalled = require('./isDependencyInstalled');
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const MATCH_ABSOLUTE_URL = /^https?:\/\/|^\/\//i;
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function fetchImageDimensions(pathOrUrl) {
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if (MATCH_ABSOLUTE_URL.test(pathOrUrl)) {
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return fetchImageDimensionsFromUrl(pathOrUrl);
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}
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return fetchImageDimensionsFromFile(pathOrUrl);
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}
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function fetchImageDimensionsFromUrl(url) {
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return probe(url);
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}
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async function fetchImageDimensionsFromFile(path) {
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// AMP Optimizer might run in a browser
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if (!isDependencyInstalled('fs')) {
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throw new Error('No access to the file system');
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}
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const fs = require('fs');
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if (!fs.existsSync(path)) {
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throw new Error('Could not resolve file: ' + path);
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}
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const stream = fs.createReadStream(path);
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try {
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return await probe(stream);
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} finally {
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stream.destroy();
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}
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}
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function probe(input) {
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if (!isDependencyInstalled('probe-image-size')) {
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throw new Error('Missing optional dependency: probe-image-size');
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}
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return require('probe-image-size')(input);
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}
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module.exports = {
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fetchImageDimensions,
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fetchImageDimensionsFromFile,
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fetchImageDimensionsFromUrl,
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};
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