81 lines
2.4 KiB
JavaScript
81 lines
2.4 KiB
JavaScript
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/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict-local
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* @format
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*/
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'use strict';
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import type {ResolvedAssetSource} from './AssetSourceResolver';
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import type {ImageProps} from './ImageProps';
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import resolveAssetSource from './resolveAssetSource';
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/**
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* A function which returns the appropriate value for image source
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* by resolving the `source`, `src` and `srcSet` props.
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*/
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export function getImageSourcesFromImageProps(
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imageProps: ImageProps,
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): ?ResolvedAssetSource | $ReadOnlyArray<{uri: string, ...}> {
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let source = resolveAssetSource(imageProps.source);
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let sources;
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const {crossOrigin, referrerPolicy, src, srcSet, width, height} = imageProps;
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const headers: {[string]: string} = {};
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if (crossOrigin === 'use-credentials') {
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headers['Access-Control-Allow-Credentials'] = 'true';
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}
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if (referrerPolicy != null) {
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headers['Referrer-Policy'] = referrerPolicy;
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}
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if (srcSet != null) {
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const sourceList = [];
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const srcSetList = srcSet.split(', ');
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// `src` prop should be used with default scale if `srcSet` does not have 1x scale.
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let shouldUseSrcForDefaultScale = true;
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srcSetList.forEach(imageSrc => {
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const [uri, xScale = '1x'] = imageSrc.split(' ');
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if (!xScale.endsWith('x')) {
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console.warn(
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'The provided format for scale is not supported yet. Please use scales like 1x, 2x, etc.',
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);
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} else {
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const scale = parseInt(xScale.split('x')[0], 10);
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if (!isNaN(scale)) {
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// 1x scale is provided in `srcSet` prop so ignore the `src` prop if provided.
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shouldUseSrcForDefaultScale =
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scale === 1 ? false : shouldUseSrcForDefaultScale;
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sourceList.push({headers: headers, scale, uri, width, height});
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}
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}
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});
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if (shouldUseSrcForDefaultScale && src != null) {
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sourceList.push({
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headers: headers,
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scale: 1,
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uri: src,
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width,
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height,
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});
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}
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if (sourceList.length === 0) {
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console.warn('The provided value for srcSet is not valid.');
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}
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sources = sourceList;
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} else if (src != null) {
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sources = [{uri: src, headers: headers, width, height}];
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} else {
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sources = source;
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}
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return sources;
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}
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