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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/expo-asset/build
Просмотр файла: PlatformUtils.js
import computeMd5 from 'blueimp-md5';
import Constants from 'expo-constants';
import * as FileSystem from 'expo-file-system';
import { NativeModulesProxy } from 'expo-modules-core';
import { getManifestBaseUrl } from './AssetUris';
// Constants.appOwnership is only available in managed apps (Expo client and standalone)
export const IS_MANAGED_ENV = !!Constants.appOwnership;
// In the future (SDK38+) expo-updates is likely to be used in managed apps, so we decide
// that you are in a bare app with updates if you're not in a managed app and you have
// local assets available.
export const IS_BARE_ENV_WITH_UPDATES = !IS_MANAGED_ENV &&
!!NativeModulesProxy.ExpoUpdates?.isEnabled &&
// if expo-updates is installed but we're running directly from the embedded bundle, we don't want
// to override the AssetSourceResolver
!NativeModulesProxy.ExpoUpdates?.isUsingEmbeddedAssets;
export const IS_ENV_WITH_UPDATES_ENABLED = IS_MANAGED_ENV || IS_BARE_ENV_WITH_UPDATES;
// If it's not managed or bare w/ updates, then it must be bare w/o updates!
export const IS_BARE_ENV_WITHOUT_UPDATES = !IS_MANAGED_ENV && !IS_BARE_ENV_WITH_UPDATES;
// Get the localAssets property from the ExpoUpdates native module so that we do
// not need to include expo-updates as a dependency of expo-asset
export function getLocalAssets() {
return NativeModulesProxy.ExpoUpdates?.localAssets ?? {};
}
export function getManifest() {
return Constants.__unsafeNoWarnManifest ?? {};
}
export function getManifest2() {
return Constants.__unsafeNoWarnManifest2;
}
// Compute manifest base URL if available
export const manifestBaseUrl = Constants.experienceUrl
? getManifestBaseUrl(Constants.experienceUrl)
: null;
// TODO: how should this behave in bare app with updates? re: hashAssetFiles
export async function downloadAsync(uri, hash, type, name) {
if (IS_MANAGED_ENV) {
return _downloadAsyncManagedEnv(uri, hash, type, name);
}
return _downloadAsyncUnmanagedEnv(uri, hash, type);
}
/**
* Check if the file exists on disk already, perform integrity check if so.
* Otherwise, download it.
*/
async function _downloadAsyncManagedEnv(uri, hash, type, name) {
const cacheFileId = hash || computeMd5(uri);
const localUri = `${FileSystem.cacheDirectory}ExponentAsset-${cacheFileId}.${type}`;
let { exists, md5 } = await FileSystem.getInfoAsync(localUri, {
md5: true,
});
if (!exists || (hash !== null && md5 !== hash)) {
({ md5 } = await FileSystem.downloadAsync(uri, localUri, {
md5: true,
}));
if (hash !== null && md5 !== hash) {
throw new Error(`Downloaded file for asset '${name}.${type}' ` +
`Located at ${uri} ` +
`failed MD5 integrity check`);
}
}
return localUri;
}
/**
* Just download the asset, don't perform integrity check because we don't have
* the hash to compare it with (we don't have hashAssetFiles plugin). Hash is
* only used for the file name.
*/
async function _downloadAsyncUnmanagedEnv(uri, hash, type) {
// TODO: does this make sense to bail out if it's already at a file URL
// because it's already available locally?
if (uri.startsWith('file://')) {
return uri;
}
const cacheFileId = hash || computeMd5(uri);
const localUri = `${FileSystem.cacheDirectory}ExponentAsset-${cacheFileId}.${type}`;
// We don't check the FileSystem for an existing version of the asset and we
// also don't perform an integrity check!
await FileSystem.downloadAsync(uri, localUri);
return localUri;
}
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