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/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
import {assert} from 'workbox-core/_private/assert.mjs';
import {logger} from 'workbox-core/_private/logger.mjs';
import {WorkboxError} from 'workbox-core/_private/WorkboxError.mjs';
import {getFriendlyURL} from 'workbox-core/_private/getFriendlyURL.mjs';
import {normalizeHandler} from './utils/normalizeHandler.mjs';
import './_version.mjs';
/**
* The Router can be used to process a FetchEvent through one or more
* [Routes]{@link workbox.routing.Route} responding with a Request if
* a matching route exists.
*
* If no route matches a given a request, the Router will use a "default"
* handler if one is defined.
*
* Should the matching Route throw an error, the Router will use a "catch"
* handler if one is defined to gracefully deal with issues and respond with a
* Request.
*
* If a request matches multiple routes, the **earliest** registered route will
* be used to respond to the request.
*
* @memberof workbox.routing
*/
class Router {
/**
* Initializes a new Router.
*/
constructor() {
this._routes = new Map();
}
/**
* @return {Map<string, Array<workbox.routing.Route>>} routes A `Map` of HTTP
* method name ('GET', etc.) to an array of all the corresponding `Route`
* instances that are registered.
*/
get routes() {
return this._routes;
}
/**
* Adds a fetch event listener to respond to events when a route matches
* the event's request.
*/
addFetchListener() {
self.addEventListener('fetch', (event) => {
const {request} = event;
const responsePromise = this.handleRequest({request, event});
if (responsePromise) {
event.respondWith(responsePromise);
}
});
}
/**
* Adds a message event listener for URLs to cache from the window.
* This is useful to cache resources loaded on the page prior to when the
* service worker started controlling it.
*
* The format of the message data sent from the window should be as follows.
* Where the `urlsToCache` array may consist of URL strings or an array of
* URL string + `requestInit` object (the same as you'd pass to `fetch()`).
*
* ```
* {
* type: 'CACHE_URLS',
* payload: {
* urlsToCache: [
* './script1.js',
* './script2.js',
* ['./script3.js', {mode: 'no-cors'}],
* ],
* },
* }
* ```
*/
addCacheListener() {
self.addEventListener('message', async (event) => {
if (event.data && event.data.type === 'CACHE_URLS') {
const {payload} = event.data;
if (process.env.NODE_ENV !== 'production') {
logger.debug(`Caching URLs from the window`, payload.urlsToCache);
}
const requestPromises = Promise.all(payload.urlsToCache.map((entry) => {
if (typeof entry === 'string') {
entry = [entry];
}
const request = new Request(...entry);
return this.handleRequest({request});
}));
event.waitUntil(requestPromises);
// If a MessageChannel was used, reply to the message on success.
if (event.ports && event.ports[0]) {
await requestPromises;
event.ports[0].postMessage(true);
}
}
});
}
/**
* Apply the routing rules to a FetchEvent object to get a Response from an
* appropriate Route's handler.
*
* @param {Object} options
* @param {Request} options.request The request to handle (this is usually
* from a fetch event, but it does not have to be).
* @param {FetchEvent} [options.event] The event that triggered the request,
* if applicable.
* @return {Promise<Response>|undefined} A promise is returned if a
* registered route can handle the request. If there is no matching
* route and there's no `defaultHandler`, `undefined` is returned.
*/
handleRequest({request, event}) {
if (process.env.NODE_ENV !== 'production') {
assert.isInstance(request, Request, {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'handleRequest',
paramName: 'options.request',
});
}
const url = new URL(request.url, location);
if (!url.protocol.startsWith('http')) {
if (process.env.NODE_ENV !== 'production') {
logger.debug(
`Workbox Router only supports URLs that start with 'http'.`);
}
return;
}
let {params, route} = this.findMatchingRoute({url, request, event});
let handler = route && route.handler;
let debugMessages = [];
if (process.env.NODE_ENV !== 'production') {
if (handler) {
debugMessages.push([
`Found a route to handle this request:`, route,
]);
if (params) {
debugMessages.push([
`Passing the following params to the route's handler:`, params,
]);
}
}
}
// If we don't have a handler because there was no matching route, then
// fall back to defaultHandler if that's defined.
if (!handler && this._defaultHandler) {
if (process.env.NODE_ENV !== 'production') {
debugMessages.push(`Failed to find a matching route. Falling ` +
`back to the default handler.`);
// This is used for debugging in logs in the case of an error.
route = '[Default Handler]';
}
handler = this._defaultHandler;
}
if (!handler) {
if (process.env.NODE_ENV !== 'production') {
// No handler so Workbox will do nothing. If logs is set of debug
// i.e. verbose, we should print out this information.
logger.debug(`No route found for: ${getFriendlyURL(url)}`);
}
return;
}
if (process.env.NODE_ENV !== 'production') {
// We have a handler, meaning Workbox is going to handle the route.
// print the routing details to the console.
logger.groupCollapsed(`Router is responding to: ${getFriendlyURL(url)}`);
debugMessages.forEach((msg) => {
if (Array.isArray(msg)) {
logger.log(...msg);
} else {
logger.log(msg);
}
});
// The Request and Response objects contains a great deal of information,
// hide it under a group in case developers want to see it.
logger.groupCollapsed(`View request details here.`);
logger.log(request);
logger.groupEnd();
logger.groupEnd();
}
// Wrap in try and catch in case the handle method throws a synchronous
// error. It should still callback to the catch handler.
let responsePromise;
try {
responsePromise = handler.handle({url, request, event, params});
} catch (err) {
responsePromise = Promise.reject(err);
}
if (responsePromise && this._catchHandler) {
responsePromise = responsePromise.catch((err) => {
if (process.env.NODE_ENV !== 'production') {
// Still include URL here as it will be async from the console group
// and may not make sense without the URL
logger.groupCollapsed(`Error thrown when responding to: ` +
` ${getFriendlyURL(url)}. Falling back to Catch Handler.`);
logger.error(`Error thrown by:`, route);
logger.error(err);
logger.groupEnd();
}
return this._catchHandler.handle({url, event, err});
});
}
return responsePromise;
}
/**
* Checks a request and URL (and optionally an event) against the list of
* registered routes, and if there's a match, returns the corresponding
* route along with any params generated by the match.
*
* @param {Object} options
* @param {URL} options.url
* @param {Request} options.request The request to match.
* @param {FetchEvent} [options.event] The corresponding event (unless N/A).
* @return {Object} An object with `route` and `params` properties.
* They are populated if a matching route was found or `undefined`
* otherwise.
*/
findMatchingRoute({url, request, event}) {
if (process.env.NODE_ENV !== 'production') {
assert.isInstance(url, URL, {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'findMatchingRoute',
paramName: 'options.url',
});
assert.isInstance(request, Request, {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'findMatchingRoute',
paramName: 'options.request',
});
}
const routes = this._routes.get(request.method) || [];
for (const route of routes) {
let params;
let matchResult = route.match({url, request, event});
if (matchResult) {
if (Array.isArray(matchResult) && matchResult.length > 0) {
// Instead of passing an empty array in as params, use undefined.
params = matchResult;
} else if ((matchResult.constructor === Object &&
Object.keys(matchResult).length > 0)) {
// Instead of passing an empty object in as params, use undefined.
params = matchResult;
}
// Return early if have a match.
return {route, params};
}
}
// If no match was found above, return and empty object.
return {};
}
/**
* Define a default `handler` that's called when no routes explicitly
* match the incoming request.
*
* Without a default handler, unmatched requests will go against the
* network as if there were no service worker present.
*
* @param {workbox.routing.Route~handlerCallback} handler A callback
* function that returns a Promise resulting in a Response.
*/
setDefaultHandler(handler) {
this._defaultHandler = normalizeHandler(handler);
}
/**
* If a Route throws an error while handling a request, this `handler`
* will be called and given a chance to provide a response.
*
* @param {workbox.routing.Route~handlerCallback} handler A callback
* function that returns a Promise resulting in a Response.
*/
setCatchHandler(handler) {
this._catchHandler = normalizeHandler(handler);
}
/**
* Registers a route with the router.
*
* @param {workbox.routing.Route} route The route to register.
*/
registerRoute(route) {
if (process.env.NODE_ENV !== 'production') {
assert.isType(route, 'object', {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'registerRoute',
paramName: 'route',
});
assert.hasMethod(route, 'match', {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'registerRoute',
paramName: 'route',
});
assert.isType(route.handler, 'object', {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'registerRoute',
paramName: 'route',
});
assert.hasMethod(route.handler, 'handle', {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'registerRoute',
paramName: 'route.handler',
});
assert.isType(route.method, 'string', {
moduleName: 'workbox-routing',
className: 'Router',
funcName: 'registerRoute',
paramName: 'route.method',
});
}
if (!this._routes.has(route.method)) {
this._routes.set(route.method, []);
}
// Give precedence to all of the earlier routes by adding this additional
// route to the end of the array.
this._routes.get(route.method).push(route);
}
/**
* Unregisters a route with the router.
*
* @param {workbox.routing.Route} route The route to unregister.
*/
unregisterRoute(route) {
if (!this._routes.has(route.method)) {
throw new WorkboxError(
'unregister-route-but-not-found-with-method', {
method: route.method,
}
);
}
const routeIndex = this._routes.get(route.method).indexOf(route);
if (routeIndex > -1) {
this._routes.get(route.method).splice(routeIndex, 1);
} else {
throw new WorkboxError('unregister-route-route-not-registered');
}
}
}
export {Router};