expo-asset/build/AssetSources.js

An Expo universal module to download assets and pass them into other APIs

import { Platform } from 'expo-modules-core';
import { PixelRatio, NativeModules } from 'react-native';
import AssetSourceResolver from './AssetSourceResolver';
import { getManifest2, manifestBaseUrl } from './PlatformUtils';
/**
 * Selects the best file for the given asset (ex: choosing the best scale for images) and returns
 * a { uri, hash } pair for the specific asset file.
 *
 * If the asset isn't an image with multiple scales, the first file is selected.
 */
export function selectAssetSource(meta) {
    // This logic is based on that of AssetSourceResolver, with additional support for file hashes and
    // explicitly provided URIs
    const scale = AssetSourceResolver.pickScale(meta.scales, PixelRatio.get());
    const index = meta.scales.findIndex((s) => s === scale);
    const hash = meta.fileHashes ? (meta.fileHashes[index] ?? meta.fileHashes[0]) : meta.hash;
    // Allow asset processors to directly provide the URL to load
    const uri = meta.fileUris ? (meta.fileUris[index] ?? meta.fileUris[0]) : meta.uri;
    if (uri) {
        return { uri: resolveUri(uri), hash };
    }
    const fileScale = scale === 1 ? '' : `@${scale}x`;
    const fileExtension = meta.type ? `.${encodeURIComponent(meta.type)}` : '';
    const suffix = `/${encodeURIComponent(meta.name)}${fileScale}${fileExtension}`;
    const params = new URLSearchParams({
        platform: Platform.OS,
        hash: meta.hash,
    });
    // For assets with a specified absolute URL, we use the existing origin instead of prepending the
    // development server or production CDN URL origin
    if (/^https?:\/\//.test(meta.httpServerLocation)) {
        const uri = meta.httpServerLocation + suffix + '?' + params;
        return { uri, hash };
    }
    // For assets during development using manifest2, we use the development server's URL origin
    const manifest2 = getManifest2();
    const devServerUrl = manifest2?.extra?.expoGo?.developer
        ? 'http://' + manifest2.extra.expoGo.debuggerHost
        : null;
    if (devServerUrl) {
        const baseUrl = new URL(meta.httpServerLocation + suffix, devServerUrl);
        baseUrl.searchParams.set('platform', Platform.OS);
        baseUrl.searchParams.set('hash', meta.hash);
        return {
            uri: baseUrl.href,
            hash,
        };
    }
    // Temporary fallback for loading assets in Expo Go home
    if (NativeModules['ExponentKernel']) {
        return { uri: `https://classic-assets.eascdn.net/~assets/${encodeURIComponent(hash)}`, hash };
    }
    // In correctly configured apps, we arrive here if the asset is locally available on disk due to
    // being managed by expo-updates, and `getLocalAssetUri(hash)` must return a local URI for this
    // hash. Since the asset is local, we don't have a remote URL and specify an invalid URL (an empty
    // string) as a placeholder.
    return { uri: '', hash };
}
/**
 * Resolves the given URI to an absolute URI. If the given URI is already an absolute URI, it is
 * simply returned. Otherwise, if it is a relative URI, it is resolved relative to the manifest's
 * base URI.
 */
export function resolveUri(uri) {
    // `manifestBaseUrl` is always an absolute URL or `null`.
    return manifestBaseUrl ? new URL(uri, manifestBaseUrl).href : uri;
}
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