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eb931fd99b
When importing a project we know the file extension for each asset to be loaded. This change provides that information to the storage system so that we can load assets which don't use the default. For example, this allows loading JPG-format backdrops. In support of this change, there's a new function on `StringUtil` called `splitFirst`, which splits a string on the first instance of a separator character. This change includes unit tests for this new function.
47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
const ScratchStorage = require('scratch-storage');
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const ASSET_SERVER = 'https://cdn.assets.scratch.mit.edu/';
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const PROJECT_SERVER = 'https://cdn.projects.scratch.mit.edu/';
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/**
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* @param {Asset} asset - calculate a URL for this asset.
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* @returns {string} a URL to download a project file.
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*/
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const getProjectUrl = function (asset) {
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const assetIdParts = asset.assetId.split('.');
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const assetUrlParts = [PROJECT_SERVER, 'internalapi/project/', assetIdParts[0], '/get/'];
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if (assetIdParts[1]) {
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assetUrlParts.push(assetIdParts[1]);
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}
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return assetUrlParts.join('');
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};
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/**
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* @param {Asset} asset - calculate a URL for this asset.
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* @returns {string} a URL to download a project asset (PNG, WAV, etc.)
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*/
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const getAssetUrl = function (asset) {
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const assetUrlParts = [
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ASSET_SERVER,
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'internalapi/asset/',
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asset.assetId,
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'.',
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asset.dataFormat,
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'/get/'
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];
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return assetUrlParts.join('');
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};
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/**
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* Construct a new instance of ScratchStorage, provide it with default web sources, and attach it to the provided VM.
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* @param {VirtualMachine} vm - the VM which will own the new ScratchStorage instance.
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*/
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const attachTestStorage = function (vm) {
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const storage = new ScratchStorage();
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const AssetType = storage.AssetType;
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storage.addWebSource([AssetType.Project], getProjectUrl);
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storage.addWebSource([AssetType.ImageVector, AssetType.ImageBitmap, AssetType.Sound], getAssetUrl);
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vm.attachStorage(storage);
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};
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module.exports = attachTestStorage;
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