803 lines
22 KiB
TypeScript
803 lines
22 KiB
TypeScript
/* global __NEXT_DATA__ */
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// tslint:disable:no-console
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import { ParsedUrlQuery } from 'querystring'
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import { ComponentType } from 'react'
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import { parse, UrlObject } from 'url'
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import mitt, { MittEmitter } from '../mitt'
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import {
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AppContextType,
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formatWithValidation,
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getURL,
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loadGetInitialProps,
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NextPageContext,
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ST,
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} from '../utils'
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import { isDynamicRoute } from './utils/is-dynamic'
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import { getRouteMatcher } from './utils/route-matcher'
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import { getRouteRegex } from './utils/route-regex'
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function addBasePath(path: string): string {
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// variable is always a string
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const p = process.env.__NEXT_ROUTER_BASEPATH as string
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return path.indexOf(p) !== 0 ? p + path : path
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}
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function toRoute(path: string): string {
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return path.replace(/\/$/, '') || '/'
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}
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const prepareRoute = (path: string) =>
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toRoute(!path || path === '/' ? '/index' : path)
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type Url = UrlObject | string
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export type BaseRouter = {
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route: string
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pathname: string
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query: ParsedUrlQuery
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asPath: string
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}
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export type NextRouter = BaseRouter &
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Pick<
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Router,
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| 'push'
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| 'replace'
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| 'reload'
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| 'back'
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| 'prefetch'
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| 'beforePopState'
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| 'events'
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| 'isFallback'
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>
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export type PrefetchOptions = {
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priority?: boolean
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}
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type RouteInfo = {
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Component: ComponentType
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props?: any
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err?: Error
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error?: any
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}
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type Subscription = (data: RouteInfo, App?: ComponentType) => void
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type BeforePopStateCallback = (state: any) => boolean
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type ComponentLoadCancel = (() => void) | null
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type HistoryMethod = 'replaceState' | 'pushState'
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function fetchNextData(
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pathname: string,
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query: ParsedUrlQuery | null,
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isServerRender: boolean,
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cb?: (...args: any) => any
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) {
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let attempts = isServerRender ? 3 : 1
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function getResponse(): Promise<any> {
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return fetch(
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formatWithValidation({
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// @ts-ignore __NEXT_DATA__
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pathname: `/_next/data/${__NEXT_DATA__.buildId}${pathname}.json`,
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query,
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})
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).then(res => {
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if (!res.ok) {
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if (--attempts > 0 && res.status >= 500) {
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return getResponse()
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}
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throw new Error(`Failed to load static props`)
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}
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return res.json()
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})
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}
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return getResponse()
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.then(data => {
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return cb ? cb(data) : data
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})
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.catch((err: Error) => {
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// We should only trigger a server-side transition if this was caused
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// on a client-side transition. Otherwise, we'd get into an infinite
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// loop.
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if (!isServerRender) {
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;(err as any).code = 'PAGE_LOAD_ERROR'
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}
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throw err
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})
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}
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export default class Router implements BaseRouter {
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route: string
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pathname: string
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query: ParsedUrlQuery
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asPath: string
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/**
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* Map of all components loaded in `Router`
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*/
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components: { [pathname: string]: RouteInfo }
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// Static Data Cache
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sdc: { [asPath: string]: object } = {}
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sub: Subscription
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clc: ComponentLoadCancel
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pageLoader: any
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_bps: BeforePopStateCallback | undefined
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events: MittEmitter
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_wrapApp: (App: ComponentType) => any
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isSsr: boolean
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isFallback: boolean
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static events: MittEmitter = mitt()
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constructor(
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pathname: string,
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query: ParsedUrlQuery,
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as: string,
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{
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initialProps,
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pageLoader,
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App,
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wrapApp,
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Component,
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err,
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subscription,
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isFallback,
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}: {
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subscription: Subscription
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initialProps: any
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pageLoader: any
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Component: ComponentType
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App: ComponentType
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wrapApp: (App: ComponentType) => any
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err?: Error
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isFallback: boolean
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}
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) {
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// represents the current component key
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this.route = toRoute(pathname)
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// set up the component cache (by route keys)
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this.components = {}
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// We should not keep the cache, if there's an error
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// Otherwise, this cause issues when when going back and
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// come again to the errored page.
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if (pathname !== '/_error') {
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this.components[this.route] = { Component, props: initialProps, err }
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}
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this.components['/_app'] = { Component: App }
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// Backwards compat for Router.router.events
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// TODO: Should be remove the following major version as it was never documented
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this.events = Router.events
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this.pageLoader = pageLoader
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this.pathname = pathname
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this.query = query
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// if auto prerendered and dynamic route wait to update asPath
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// until after mount to prevent hydration mismatch
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this.asPath =
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// @ts-ignore this is temporarily global (attached to window)
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isDynamicRoute(pathname) && __NEXT_DATA__.autoExport ? pathname : as
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this.sub = subscription
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this.clc = null
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this._wrapApp = wrapApp
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// make sure to ignore extra popState in safari on navigating
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// back from external site
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this.isSsr = true
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this.isFallback = isFallback
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if (typeof window !== 'undefined') {
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// in order for `e.state` to work on the `onpopstate` event
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// we have to register the initial route upon initialization
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this.changeState(
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'replaceState',
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formatWithValidation({ pathname, query }),
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as
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)
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window.addEventListener('popstate', this.onPopState)
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}
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}
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// @deprecated backwards compatibility even though it's a private method.
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static _rewriteUrlForNextExport(url: string): string {
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if (process.env.__NEXT_EXPORT_TRAILING_SLASH) {
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const rewriteUrlForNextExport = require('./rewrite-url-for-export')
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.rewriteUrlForNextExport
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return rewriteUrlForNextExport(url)
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} else {
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return url
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}
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}
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onPopState = (e: PopStateEvent): void => {
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if (!e.state) {
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// We get state as undefined for two reasons.
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// 1. With older safari (< 8) and older chrome (< 34)
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// 2. When the URL changed with #
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//
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// In the both cases, we don't need to proceed and change the route.
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// (as it's already changed)
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// But we can simply replace the state with the new changes.
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// Actually, for (1) we don't need to nothing. But it's hard to detect that event.
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// So, doing the following for (1) does no harm.
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const { pathname, query } = this
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this.changeState(
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'replaceState',
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formatWithValidation({ pathname, query }),
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getURL()
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)
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return
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}
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// Make sure we don't re-render on initial load,
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// can be caused by navigating back from an external site
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if (
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e.state &&
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this.isSsr &&
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e.state.as === this.asPath &&
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parse(e.state.url).pathname === this.pathname
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) {
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return
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}
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// If the downstream application returns falsy, return.
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// They will then be responsible for handling the event.
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if (this._bps && !this._bps(e.state)) {
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return
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}
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const { url, as, options } = e.state
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if (process.env.NODE_ENV !== 'production') {
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if (typeof url === 'undefined' || typeof as === 'undefined') {
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console.warn(
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'`popstate` event triggered but `event.state` did not have `url` or `as` https://err.sh/zeit/next.js/popstate-state-empty'
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)
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}
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}
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this.replace(url, as, options)
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}
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update(route: string, mod: any) {
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const Component: ComponentType = mod.default || mod
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const data = this.components[route]
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if (!data) {
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throw new Error(`Cannot update unavailable route: ${route}`)
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}
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const newData = { ...data, Component }
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this.components[route] = newData
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// pages/_app.js updated
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if (route === '/_app') {
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this.notify(this.components[this.route])
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return
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}
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if (route === this.route) {
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this.notify(newData)
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}
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}
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reload(): void {
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window.location.reload()
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}
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/**
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* Go back in history
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*/
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back() {
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window.history.back()
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}
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/**
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* Performs a `pushState` with arguments
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* @param url of the route
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* @param as masks `url` for the browser
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* @param options object you can define `shallow` and other options
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*/
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push(url: Url, as: Url = url, options = {}) {
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return this.change('pushState', url, as, options)
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}
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/**
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* Performs a `replaceState` with arguments
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* @param url of the route
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* @param as masks `url` for the browser
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* @param options object you can define `shallow` and other options
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*/
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replace(url: Url, as: Url = url, options = {}) {
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return this.change('replaceState', url, as, options)
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}
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change(
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method: HistoryMethod,
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_url: Url,
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_as: Url,
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options: any
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): Promise<boolean> {
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return new Promise((resolve, reject) => {
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if (!options._h) {
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this.isSsr = false
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}
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// marking route changes as a navigation start entry
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if (ST) {
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performance.mark('routeChange')
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}
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// If url and as provided as an object representation,
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// we'll format them into the string version here.
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const url = typeof _url === 'object' ? formatWithValidation(_url) : _url
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let as = typeof _as === 'object' ? formatWithValidation(_as) : _as
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// Add the ending slash to the paths. So, we can serve the
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// "<page>/index.html" directly for the SSR page.
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if (process.env.__NEXT_EXPORT_TRAILING_SLASH) {
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const rewriteUrlForNextExport = require('./rewrite-url-for-export')
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.rewriteUrlForNextExport
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// @ts-ignore this is temporarily global (attached to window)
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if (__NEXT_DATA__.nextExport) {
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as = rewriteUrlForNextExport(as)
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}
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}
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this.abortComponentLoad(as)
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// If the url change is only related to a hash change
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// We should not proceed. We should only change the state.
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// WARNING: `_h` is an internal option for handing Next.js client-side
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// hydration. Your app should _never_ use this property. It may change at
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// any time without notice.
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if (!options._h && this.onlyAHashChange(as)) {
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this.asPath = as
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Router.events.emit('hashChangeStart', as)
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this.changeState(method, url, addBasePath(as), options)
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this.scrollToHash(as)
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Router.events.emit('hashChangeComplete', as)
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return resolve(true)
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}
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const { pathname, query, protocol } = parse(url, true)
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if (!pathname || protocol) {
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if (process.env.NODE_ENV !== 'production') {
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throw new Error(
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`Invalid href passed to router: ${url} https://err.sh/zeit/next.js/invalid-href-passed`
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)
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}
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return resolve(false)
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}
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// If asked to change the current URL we should reload the current page
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// (not location.reload() but reload getInitialProps and other Next.js stuffs)
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// We also need to set the method = replaceState always
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// as this should not go into the history (That's how browsers work)
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// We should compare the new asPath to the current asPath, not the url
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if (!this.urlIsNew(as)) {
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method = 'replaceState'
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}
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const route = toRoute(pathname)
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const { shallow = false } = options
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if (isDynamicRoute(route)) {
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const { pathname: asPathname } = parse(as)
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const routeRegex = getRouteRegex(route)
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const routeMatch = getRouteMatcher(routeRegex)(asPathname)
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if (!routeMatch) {
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const missingParams = Object.keys(routeRegex.groups).filter(
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param => !query[param]
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)
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if (missingParams.length > 0) {
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if (process.env.NODE_ENV !== 'production') {
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console.warn(
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`Mismatching \`as\` and \`href\` failed to manually provide ` +
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`the params: ${missingParams.join(
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', '
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)} in the \`href\`'s \`query\``
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)
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}
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return reject(
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new Error(
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`The provided \`as\` value (${asPathname}) is incompatible with the \`href\` value (${route}). ` +
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`Read more: https://err.sh/zeit/next.js/incompatible-href-as`
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)
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)
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}
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} else {
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// Merge params into `query`, overwriting any specified in search
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Object.assign(query, routeMatch)
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}
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}
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Router.events.emit('routeChangeStart', as)
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// If shallow is true and the route exists in the router cache we reuse the previous result
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this.getRouteInfo(route, pathname, query, as, shallow).then(routeInfo => {
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const { error } = routeInfo
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if (error && error.cancelled) {
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return resolve(false)
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}
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Router.events.emit('beforeHistoryChange', as)
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this.changeState(method, url, addBasePath(as), options)
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if (process.env.NODE_ENV !== 'production') {
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const appComp: any = this.components['/_app'].Component
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;(window as any).next.isPrerendered =
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appComp.getInitialProps === appComp.origGetInitialProps &&
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!(routeInfo.Component as any).getInitialProps
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}
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this.set(route, pathname, query, as, routeInfo)
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if (error) {
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Router.events.emit('routeChangeError', error, as)
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throw error
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}
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Router.events.emit('routeChangeComplete', as)
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return resolve(true)
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}, reject)
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})
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}
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changeState(
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method: HistoryMethod,
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url: string,
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as: string,
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options = {}
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): void {
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if (process.env.NODE_ENV !== 'production') {
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if (typeof window.history === 'undefined') {
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console.error(`Warning: window.history is not available.`)
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return
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}
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if (typeof window.history[method] === 'undefined') {
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console.error(`Warning: window.history.${method} is not available`)
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return
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}
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}
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if (method !== 'pushState' || getURL() !== as) {
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window.history[method](
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{
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url,
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as,
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options,
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},
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// Most browsers currently ignores this parameter, although they may use it in the future.
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// Passing the empty string here should be safe against future changes to the method.
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// https://developer.mozilla.org/en-US/docs/Web/API/History/replaceState
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'',
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as
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)
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}
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}
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getRouteInfo(
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route: string,
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pathname: string,
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query: any,
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as: string,
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shallow: boolean = false
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): Promise<RouteInfo> {
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const cachedRouteInfo = this.components[route]
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// If there is a shallow route transition possible
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// If the route is already rendered on the screen.
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if (shallow && cachedRouteInfo && this.route === route) {
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return Promise.resolve(cachedRouteInfo)
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}
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const handleError = (
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err: Error & { code: any; cancelled: boolean },
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loadErrorFail?: boolean
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) => {
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return new Promise(resolve => {
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if (err.code === 'PAGE_LOAD_ERROR' || loadErrorFail) {
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// If we can't load the page it could be one of following reasons
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// 1. Page doesn't exists
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// 2. Page does exist in a different zone
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// 3. Internal error while loading the page
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// So, doing a hard reload is the proper way to deal with this.
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window.location.href = as
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// Changing the URL doesn't block executing the current code path.
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// So, we need to mark it as a cancelled error and stop the routing logic.
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err.cancelled = true
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// @ts-ignore TODO: fix the control flow here
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return resolve({ error: err })
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}
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if (err.cancelled) {
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// @ts-ignore TODO: fix the control flow here
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return resolve({ error: err })
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}
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resolve(
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this.fetchComponent('/_error')
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.then(Component => {
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const routeInfo: RouteInfo = { Component, err }
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return new Promise(resolve => {
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this.getInitialProps(Component, {
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err,
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pathname,
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query,
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} as any).then(
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props => {
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routeInfo.props = props
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routeInfo.error = err
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resolve(routeInfo)
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},
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gipErr => {
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console.error(
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'Error in error page `getInitialProps`: ',
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gipErr
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)
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routeInfo.error = err
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routeInfo.props = {}
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resolve(routeInfo)
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}
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)
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}) as Promise<RouteInfo>
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})
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.catch(err => handleError(err, true))
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)
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}) as Promise<RouteInfo>
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}
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return (new Promise((resolve, reject) => {
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if (cachedRouteInfo) {
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return resolve(cachedRouteInfo)
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}
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this.fetchComponent(route).then(
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Component => resolve({ Component }),
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reject
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)
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}) as Promise<RouteInfo>)
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.then((routeInfo: RouteInfo) => {
|
|
const { Component } = routeInfo
|
|
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
const { isValidElementType } = require('react-is')
|
|
if (!isValidElementType(Component)) {
|
|
throw new Error(
|
|
`The default export is not a React Component in page: "${pathname}"`
|
|
)
|
|
}
|
|
}
|
|
|
|
return this._getData<RouteInfo>(() =>
|
|
(Component as any).__N_SSG
|
|
? this._getStaticData(as)
|
|
: (Component as any).__N_SSP
|
|
? this._getServerData(as)
|
|
: this.getInitialProps(
|
|
Component,
|
|
// we provide AppTree later so this needs to be `any`
|
|
{
|
|
pathname,
|
|
query,
|
|
asPath: as,
|
|
} as any
|
|
)
|
|
).then(props => {
|
|
routeInfo.props = props
|
|
this.components[route] = routeInfo
|
|
return routeInfo
|
|
})
|
|
})
|
|
.catch(handleError)
|
|
}
|
|
|
|
set(
|
|
route: string,
|
|
pathname: string,
|
|
query: any,
|
|
as: string,
|
|
data: RouteInfo
|
|
): void {
|
|
this.isFallback = false
|
|
|
|
this.route = route
|
|
this.pathname = pathname
|
|
this.query = query
|
|
this.asPath = as
|
|
this.notify(data)
|
|
}
|
|
|
|
/**
|
|
* Callback to execute before replacing router state
|
|
* @param cb callback to be executed
|
|
*/
|
|
beforePopState(cb: BeforePopStateCallback) {
|
|
this._bps = cb
|
|
}
|
|
|
|
onlyAHashChange(as: string): boolean {
|
|
if (!this.asPath) return false
|
|
const [oldUrlNoHash, oldHash] = this.asPath.split('#')
|
|
const [newUrlNoHash, newHash] = as.split('#')
|
|
|
|
// Makes sure we scroll to the provided hash if the url/hash are the same
|
|
if (newHash && oldUrlNoHash === newUrlNoHash && oldHash === newHash) {
|
|
return true
|
|
}
|
|
|
|
// If the urls are change, there's more than a hash change
|
|
if (oldUrlNoHash !== newUrlNoHash) {
|
|
return false
|
|
}
|
|
|
|
// If the hash has changed, then it's a hash only change.
|
|
// This check is necessary to handle both the enter and
|
|
// leave hash === '' cases. The identity case falls through
|
|
// and is treated as a next reload.
|
|
return oldHash !== newHash
|
|
}
|
|
|
|
scrollToHash(as: string): void {
|
|
const [, hash] = as.split('#')
|
|
// Scroll to top if the hash is just `#` with no value
|
|
if (hash === '') {
|
|
window.scrollTo(0, 0)
|
|
return
|
|
}
|
|
|
|
// First we check if the element by id is found
|
|
const idEl = document.getElementById(hash)
|
|
if (idEl) {
|
|
idEl.scrollIntoView()
|
|
return
|
|
}
|
|
// If there's no element with the id, we check the `name` property
|
|
// To mirror browsers
|
|
const nameEl = document.getElementsByName(hash)[0]
|
|
if (nameEl) {
|
|
nameEl.scrollIntoView()
|
|
}
|
|
}
|
|
|
|
urlIsNew(asPath: string): boolean {
|
|
return this.asPath !== asPath
|
|
}
|
|
|
|
/**
|
|
* Prefetch page code, you may wait for the data during page rendering.
|
|
* This feature only works in production!
|
|
* @param url the href of prefetched page
|
|
* @param asPath the as path of the prefetched page
|
|
*/
|
|
prefetch(
|
|
url: string,
|
|
asPath: string = url,
|
|
options: PrefetchOptions = {}
|
|
): Promise<void> {
|
|
return new Promise((resolve, reject) => {
|
|
const { pathname, protocol } = parse(url)
|
|
|
|
if (!pathname || protocol) {
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
throw new Error(
|
|
`Invalid href passed to router: ${url} https://err.sh/zeit/next.js/invalid-href-passed`
|
|
)
|
|
}
|
|
return
|
|
}
|
|
|
|
// Prefetch is not supported in development mode because it would trigger on-demand-entries
|
|
if (process.env.NODE_ENV !== 'production') {
|
|
return
|
|
}
|
|
|
|
this.pageLoader[options.priority ? 'loadPage' : 'prefetch'](
|
|
toRoute(pathname)
|
|
).then(() => resolve(), reject)
|
|
})
|
|
}
|
|
|
|
async fetchComponent(route: string): Promise<ComponentType> {
|
|
let cancelled = false
|
|
const cancel = (this.clc = () => {
|
|
cancelled = true
|
|
})
|
|
|
|
const Component = await this.pageLoader.loadPage(route)
|
|
|
|
if (cancelled) {
|
|
const error: any = new Error(
|
|
`Abort fetching component for route: "${route}"`
|
|
)
|
|
error.cancelled = true
|
|
throw error
|
|
}
|
|
|
|
if (cancel === this.clc) {
|
|
this.clc = null
|
|
}
|
|
|
|
return Component
|
|
}
|
|
|
|
_getData<T>(fn: () => Promise<T>): Promise<T> {
|
|
let cancelled = false
|
|
const cancel = () => {
|
|
cancelled = true
|
|
}
|
|
this.clc = cancel
|
|
return fn().then(data => {
|
|
if (cancel === this.clc) {
|
|
this.clc = null
|
|
}
|
|
|
|
if (cancelled) {
|
|
const err: any = new Error('Loading initial props cancelled')
|
|
err.cancelled = true
|
|
throw err
|
|
}
|
|
|
|
return data
|
|
})
|
|
}
|
|
|
|
_getStaticData = (asPath: string): Promise<object> => {
|
|
const pathname = prepareRoute(parse(asPath).pathname!)
|
|
|
|
return process.env.NODE_ENV === 'production' && this.sdc[pathname]
|
|
? Promise.resolve(this.sdc[pathname])
|
|
: fetchNextData(
|
|
pathname,
|
|
null,
|
|
this.isSsr,
|
|
data => (this.sdc[pathname] = data)
|
|
)
|
|
}
|
|
|
|
_getServerData = (asPath: string): Promise<object> => {
|
|
let { pathname, query } = parse(asPath, true)
|
|
pathname = prepareRoute(pathname!)
|
|
return fetchNextData(pathname, query, this.isSsr)
|
|
}
|
|
|
|
getInitialProps(
|
|
Component: ComponentType,
|
|
ctx: NextPageContext
|
|
): Promise<any> {
|
|
const { Component: App } = this.components['/_app']
|
|
const AppTree = this._wrapApp(App)
|
|
ctx.AppTree = AppTree
|
|
return loadGetInitialProps<AppContextType<Router>>(App, {
|
|
AppTree,
|
|
Component,
|
|
router: this,
|
|
ctx,
|
|
})
|
|
}
|
|
|
|
abortComponentLoad(as: string): void {
|
|
if (this.clc) {
|
|
const e = new Error('Route Cancelled')
|
|
;(e as any).cancelled = true
|
|
Router.events.emit('routeChangeError', e, as)
|
|
this.clc()
|
|
this.clc = null
|
|
}
|
|
}
|
|
|
|
notify(data: RouteInfo): void {
|
|
this.sub(data, this.components['/_app'].Component)
|
|
}
|
|
}
|