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const ArgumentType = require('../extension-support/argument-type');
const BlockType = require('../extension-support/block-type');
const TargetType = require('../extension-support/target-type');
const Cast = require('./cast');
const Clone = require('./clone');
const Color = require('./color');
/**
* Parse a URL object or return null.
* @param {string} url
* @returns {URL|null}
*/
const parseURL = url => {
try {
return new URL(url, location.href);
} catch (e) {
return null;
}
};
class CustomExtensionApi {
constructor (followLimitations) {
this.limited = followLimitations === true;
}
get ArgumentType () {
return ArgumentType;
}
get BlockType () {
return BlockType;
}
get TargetType () {
return TargetType;
}
get Cast () {
return Cast;
}
get Clone () {
return Clone;
}
get Color () {
return Color;
}
get vm () {
return vm;
}
get renderer () {
return CustomExtensionApi.vm.runtime.renderer;
}
async canFetch (url) {
if (this.limited) {
const parsed = parseURL(url);
if (!parsed) {
return false;
}
// Always allow protocols that don't involve a remote request.
if (parsed.protocol === 'blob:' || parsed.protocol === 'data:') {
return true;
}
return true;
}
return true;
}
async canOpenWindow (url) {
if (this.limited) {
const parsed = parseURL(url);
if (!parsed) {
return false;
}
// Always reject protocols that would allow code execution.
// eslint-disable-next-line no-script-url
if (parsed.protocol === 'javascript:') {
return false;
}
return true;
}
return true;
}
async canRedirect (url) {
if (this.limited) {
const parsed = parseURL(url);
if (!parsed) {
return false;
}
// Always reject protocols that would allow code execution.
// eslint-disable-next-line no-script-url
if (parsed.protocol === 'javascript:') {
return false;
}
return true;
}
return true;
}
async fetch (url, options) {
if (this.limited) {
const actualURL = url instanceof Request ? url.url : url;
if (!await global.Scratch.canFetch(actualURL)) {
throw new Error(`Permission to fetch ${actualURL} rejected.`);
}
return fetch(url, {
...options,
redirect: 'error'
});
}
return fetch(url, {
...options,
redirect: 'error'
});
}
async openWindow (url, features) {
if (this.limited) {
if (!await global.Scratch.canOpenWindow(url)) {
throw new Error(`Permission to open tab ${url} rejected.`);
}
return window.open(url, '_blank', features);
}
return window.open(url, '_blank', features);
}
async redirect (url) {
if (this.limited) {
if (!await global.Scratch.canRedirect(url)) {
throw new Error(`Permission to redirect to ${url} rejected.`);
}
location.href = url;
return;
}
location.href = url;
}
get extensions () {
return {
unsandboxed: true,
register: () => {
throw new Error("Register cannot be replicated in custom-ext-api-to-core");
}
};
}
};
module.exports = CustomExtensionApi;
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