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install.ts
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install.ts
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/**
* Copyright 2018 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { MutationFromWorker, MessageType, MessageFromWorker } from '../transfer/Messages';
import { MutatorProcessor } from './mutator';
import { NodeContext } from './nodes';
import { StringContext } from './strings';
import { TransferrableKeys } from '../transfer/TransferrableKeys';
import { InboundWorkerDOMConfiguration, normalizeConfiguration } from './configuration';
import { WorkerContext } from './worker';
import { ObjectContext } from './object-context';
import { ExportedWorker } from './exported-worker';
const ALLOWABLE_MESSAGE_TYPES = [MessageType.MUTATE, MessageType.HYDRATE];
/**
* @param baseElement
* @param authorScriptURL
* @param workerDOMURL
* @param callbacks
* @param sanitizer
* @param debug
*/
export function fetchAndInstall(baseElement: HTMLElement, config: InboundWorkerDOMConfiguration): Promise<ExportedWorker | null> {
const fetchPromise = Promise.all([
// TODO(KB): Fetch Polyfill for IE11.
fetch(config.domURL).then((response) => response.text()),
fetch(config.authorURL).then((response) => response.text()),
]);
return install(fetchPromise, baseElement, config);
}
/**
* @param fetchPromise
* @param baseElement
* @param config
*/
export function install(
fetchPromise: Promise<[string, string]>,
baseElement: HTMLElement,
config: InboundWorkerDOMConfiguration,
): Promise<ExportedWorker | null> {
const stringContext = new StringContext();
const objectContext = new ObjectContext();
const nodeContext = new NodeContext(stringContext, baseElement);
const normalizedConfig = normalizeConfiguration(config);
return fetchPromise.then(([domScriptContent, authorScriptContent]) => {
if (domScriptContent && authorScriptContent && config.authorURL) {
const workerContext = new WorkerContext(baseElement, nodeContext, domScriptContent, authorScriptContent, normalizedConfig);
const mutatorContext = new MutatorProcessor(stringContext, nodeContext, workerContext, normalizedConfig, objectContext);
workerContext.worker.onmessage = (message: MessageFromWorker) => {
const { data } = message;
if (!ALLOWABLE_MESSAGE_TYPES.includes(data[TransferrableKeys.type])) {
return;
}
mutatorContext.mutate(
(data as MutationFromWorker)[TransferrableKeys.phase],
(data as MutationFromWorker)[TransferrableKeys.nodes],
(data as MutationFromWorker)[TransferrableKeys.strings],
new Uint16Array(data[TransferrableKeys.mutations]),
);
if (config.onReceiveMessage) {
config.onReceiveMessage(message);
}
};
return workerContext.ready().then(() => new ExportedWorker(workerContext, normalizedConfig));
}
return null;
});
}