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509 lines
18 KiB
509 lines
18 KiB
import {AppClass} from '../../lifecycle/AppClass'
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import {HTTPMethod, Request} from '../lifecycle/Request'
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import {Application} from '../../lifecycle/Application'
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import {RouteGroup} from './RouteGroup'
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import {ResponseFactory} from '../response/ResponseFactory'
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import {Response} from '../lifecycle/Response'
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import {Controllers} from '../../service/Controllers'
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import {ErrorWithContext, Collection} from '../../util'
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import {Container} from '../../di'
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import {Controller} from '../Controller'
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import {Middlewares} from '../../service/Middlewares'
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import {Middleware} from './Middleware'
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import {Config} from '../../service/Config'
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/**
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* Type alias for an item that is a valid response object, or lack thereof.
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*/
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export type ResponseObject = ResponseFactory | string | number | void | any | Promise<ResponseObject>
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/**
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* Type alias for an item that defines a direct route handler.
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*/
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export type RouteHandler = ((request: Request, response: Response) => ResponseObject) | ((request: Request) => ResponseObject) | (() => ResponseObject) | string
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/**
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* Type alias for a function that applies a route handler to the request.
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* The goal is to transform RouteHandlers to ResolvedRouteHandler.
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*/
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export type ResolvedRouteHandler = (request: Request) => ResponseObject
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// TODO domains, named routes - support this on groups as well
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/**
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* A class that can be used to build and reference dynamic routes in the application.
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*
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* Routes can be defined in nested groups, with prefixes and middleware handlers.
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*
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* @example
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* ```typescript
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* Route.post('/api/v1/ping', (request: Request) => {
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* return 'pong!'
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* })
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*
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* Route.group('/api/v2', () => {
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* Route.get('/status', 'controller::api:v2:Status.getStatus').pre('auth:UserOnly')
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* })
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* ```
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*/
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export class Route extends AppClass {
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/** Routes that have been created and registered in the application. */
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private static registeredRoutes: Route[] = []
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/** Groups of routes that have been registered with the application. */
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private static registeredGroups: RouteGroup[] = []
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/**
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* The current nested group stack. This is used internally when compiling the routes by nested group.
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* @private
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*/
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private static compiledGroupStack: RouteGroup[] = []
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/** Register a route group handler. */
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public static registerGroup(group: RouteGroup): void {
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this.registeredGroups.push(group)
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}
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/**
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* Load and compile all of the registered routes and their groups, accounting
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* for nested groups and resolving handlers.
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*
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* This function attempts to resolve the route handlers ahead of time to cache
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* them and also expose any handler resolution errors that might happen at runtime.
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*/
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public static async compile(): Promise<Route[]> {
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let registeredRoutes = this.registeredRoutes
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const registeredGroups = this.registeredGroups
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this.registeredRoutes = []
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this.registeredGroups = []
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const configService = <Config> Container.getContainer().make(Config)
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const globalMiddleware = configService.get('server.middleware.global', {})
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const stack = [...this.compiledGroupStack].reverse()
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for ( const route of registeredRoutes ) {
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for ( const group of stack ) {
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route.prepend(group.prefix)
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group.getGroupMiddlewareDefinitions()
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.where('stage', '=', 'pre')
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.each(def => {
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route.prependMiddleware(def)
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})
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}
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for ( const group of this.compiledGroupStack ) {
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group.getGroupMiddlewareDefinitions()
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.where('stage', '=', 'post')
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.each(def => route.appendMiddleware(def))
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}
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// Add the global pre- and post- middleware
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if ( Array.isArray(globalMiddleware?.pre) ) {
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const globalPre = [...globalMiddleware.pre].reverse()
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for ( const item of globalPre ) {
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if ( typeof item !== 'string' ) {
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throw new ErrorWithContext(`Invalid global pre-middleware definition. Global middleware must be string-references.`, {
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configKey: 'server.middleware.global.pre',
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})
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}
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route.prependMiddleware({
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stage: 'pre',
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handler: item,
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})
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}
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}
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if ( Array.isArray(globalMiddleware?.post) ) {
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const globalPost = [...globalMiddleware.post]
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for ( const item of globalPost ) {
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if ( typeof item !== 'string' ) {
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throw new ErrorWithContext(`Invalid global post-middleware definition. Global middleware must be string-references.`, {
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configKey: 'server.middleware.global.post',
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})
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}
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route.appendMiddleware({
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stage: 'post',
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handler: item,
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})
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}
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}
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route.resolvePreflight() // Try to resolve here to catch any errors at boot-time and pre-compile
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route.resolveHandler()
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route.resolvePostflight()
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}
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for ( const group of registeredGroups ) {
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this.compiledGroupStack.push(group)
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await group.group()
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const childCompilation = await this.compile()
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registeredRoutes = registeredRoutes.concat(childCompilation)
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this.compiledGroupStack.pop()
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}
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return registeredRoutes
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}
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/**
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* Create a new route on the given endpoint for the given HTTP verb.
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* @param method
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* @param definition
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* @param handler
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*/
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public static endpoint(method: HTTPMethod | HTTPMethod[], definition: string, handler: RouteHandler): Route {
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const route = new Route(method, handler, definition)
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this.registeredRoutes.push(route)
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return route
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}
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/**
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* Create a new GET route on the given endpoint.
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* @param definition
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* @param handler
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*/
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public static get(definition: string, handler: RouteHandler): Route {
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return this.endpoint('get', definition, handler)
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}
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/** Create a new POST route on the given endpoint. */
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public static post(definition: string, handler: RouteHandler): Route {
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return this.endpoint('post', definition, handler)
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}
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/** Create a new PUT route on the given endpoint. */
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public static put(definition: string, handler: RouteHandler): Route {
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return this.endpoint('put', definition, handler)
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}
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/** Create a new PATCH route on the given endpoint. */
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public static patch(definition: string, handler: RouteHandler): Route {
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return this.endpoint('patch', definition, handler)
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}
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/** Create a new DELETE route on the given endpoint. */
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public static delete(definition: string, handler: RouteHandler): Route {
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return this.endpoint('delete', definition, handler)
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}
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/** Create a new route on all HTTP verbs, on the given endpoint. */
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public static any(definition: string, handler: RouteHandler): Route {
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return this.endpoint(['get', 'put', 'patch', 'post', 'delete'], definition, handler)
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}
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/** Create a new route group with the given prefix. */
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public static group(prefix: string, group: () => void | Promise<void>): RouteGroup {
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const grp = <RouteGroup> Application.getApplication().make(RouteGroup, group, prefix)
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this.registeredGroups.push(grp)
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return grp
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}
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/** Middlewares that should be applied to this route. */
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protected middlewares: Collection<{ stage: 'pre' | 'post', handler: RouteHandler }> = new Collection<{stage: 'pre' | 'post'; handler: RouteHandler}>()
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/** Pre-compiled route handlers for the pre-middleware for this route. */
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protected compiledPreflight?: ResolvedRouteHandler[]
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/** Pre-compiled route handlers for the post-middleware for this route. */
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protected compiledHandler?: ResolvedRouteHandler
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/** Pre-compiled route handler for the main route handler for this route. */
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protected compiledPostflight?: ResolvedRouteHandler[]
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/** Programmatic aliases of this route. */
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public aliases: string[] = []
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constructor(
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/** The HTTP method(s) that this route listens on. */
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protected method: HTTPMethod | HTTPMethod[],
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/** The primary handler of this route. */
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protected readonly handler: RouteHandler,
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/** The route path this route listens on. */
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protected route: string,
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) {
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super()
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}
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/**
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* Set a programmatic name for this route.
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* @param name
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*/
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public alias(name: string): this {
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this.aliases.push(name)
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return this
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}
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/**
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* Get the string-form of the route.
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*/
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public getRoute(): string {
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return this.route
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}
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/**
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* Get the string-form method of the route.
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*/
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public getMethod(): HTTPMethod | HTTPMethod[] {
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return this.method
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}
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/**
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* Get collection of applied middlewares.
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*/
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public getMiddlewares(): Collection<{ stage: 'pre' | 'post', handler: RouteHandler }> {
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return this.middlewares.clone()
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}
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/**
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* Get the string-form of the route handler.
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*/
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public getDisplayableHandler(): string {
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return typeof this.handler === 'string' ? this.handler : '(anonymous function)'
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}
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/**
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* Returns true if this route matches the given HTTP verb and request path.
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* @param method
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* @param potential
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*/
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public match(method: HTTPMethod, potential: string): boolean {
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if ( Array.isArray(this.method) && !this.method.includes(method) ) {
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return false
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} else if ( !Array.isArray(this.method) && this.method !== method ) {
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return false
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}
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return Boolean(this.extract(potential))
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}
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/**
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* Given a request path, try to extract this route's paramters from the path string.
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*
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* @example
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* For route `/foo/:bar/baz` and input `/foo/bob/baz`, extracts:
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*
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* ```typescript
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* {
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* bar: 'bob'
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* }
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* ```
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*
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* @param potential
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*/
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public extract(potential: string): {[key: string]: string} | undefined {
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const routeParts = (this.route.startsWith('/') ? this.route.substr(1) : this.route).split('/')
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const potentialParts = (potential.startsWith('/') ? potential.substr(1) : potential).split('/')
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const params: any = {}
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let wildcardIdx = 0
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for ( let i = 0; i < routeParts.length; i += 1 ) {
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const part = routeParts[i]
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if ( part === '**' ) {
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params[wildcardIdx] = potentialParts.slice(i).join('/')
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return params
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}
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if ( (potentialParts.length - 1) < i ) {
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return
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}
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if ( part === '*' ) {
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params[wildcardIdx] = potentialParts[i]
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wildcardIdx += 1
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} else if ( part.startsWith(':') ) {
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params[part.substr(1)] = potentialParts[i]
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} else if ( potentialParts[i] !== part ) {
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return
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}
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}
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// If we got here, we didn't find a **
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// So, if the lengths are different, fail
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if ( routeParts.length !== potentialParts.length ) {
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return
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}
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return params
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}
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/**
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* Try to pre-compile and return the preflight handlers for this route.
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*/
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public resolvePreflight(): ResolvedRouteHandler[] {
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if ( !this.compiledPreflight ) {
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this.compiledPreflight = this.resolveMiddlewareHandlersForStage('pre')
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}
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return this.compiledPreflight
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}
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/**
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* Try to pre-compile and return the postflight handlers for this route.
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*/
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public resolvePostflight(): ResolvedRouteHandler[] {
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if ( !this.compiledPostflight ) {
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this.compiledPostflight = this.resolveMiddlewareHandlersForStage('post')
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}
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return this.compiledPostflight
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}
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/**
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* Try to pre-compile and return the main handler for this route.
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*/
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public resolveHandler(): ResolvedRouteHandler {
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if ( !this.compiledHandler ) {
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this.compiledHandler = this.compileResolvedHandler()
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}
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return this.compiledHandler
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}
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/** Register the given middleware as a preflight handler for this route. */
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pre(middleware: RouteHandler): this {
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this.middlewares.push({
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stage: 'pre',
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handler: middleware,
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})
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return this
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}
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/** Register the given middleware as a postflight handler for this route. */
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post(middleware: RouteHandler): this {
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this.middlewares.push({
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stage: 'post',
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handler: middleware,
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})
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return this
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}
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/** Prefix the route's path with the given prefix, normalizing `/` characters. */
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private prepend(prefix: string): this {
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if ( !prefix.endsWith('/') ) {
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prefix = `${prefix}/`
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}
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if ( this.route.startsWith('/') ) {
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this.route = this.route.substring(1)
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}
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this.route = `${prefix}${this.route}`
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return this
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}
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/** Add the given middleware item to the beginning of the preflight handlers. */
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private prependMiddleware(def: { stage: 'pre' | 'post', handler: RouteHandler }): void {
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this.middlewares.prepend(def)
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}
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/** Add the given middleware item to the end of the postflight handlers. */
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private appendMiddleware(def: { stage: 'pre' | 'post', handler: RouteHandler }): void {
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this.middlewares.push(def)
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}
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/**
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* Resolve and return the route handler for this route.
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* @private
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*/
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private compileResolvedHandler(): ResolvedRouteHandler {
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const handler = this.handler
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if ( typeof handler !== 'string' ) {
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return (request: Request) => {
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return handler(request, request.response)
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}
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} else {
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const parts = handler.split('.')
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if ( parts.length < 2 ) {
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const e = new ErrorWithContext('Route handler does not specify a method name.')
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e.context = {
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handler,
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}
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throw e
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}
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const [controllerName, methodName] = parts
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const controllersService = <Controllers> this.make(Controllers)
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const controllerClass = controllersService.get(controllerName)
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if ( !controllerClass ) {
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const e = new ErrorWithContext('Controller not found for route handler.')
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e.context = {
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handler,
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controllerName,
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methodName,
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}
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throw e
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}
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return (request: Request) => {
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// If not a function, then we got a string reference to a controller method
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// So, we need to use the request container to instantiate the controller
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// and bind the method
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const controller = <Controller> request.make(controllerClass, request)
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const method = controller.getBoundMethod(methodName)
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return method()
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}
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}
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}
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/**
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* Resolve and return the route handlers for the given pre- or post-flight stage.
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* @param stage
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* @private
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*/
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private resolveMiddlewareHandlersForStage(stage: 'pre' | 'post'): ResolvedRouteHandler[] {
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return this.middlewares.where('stage', '=', stage)
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.map<ResolvedRouteHandler>(def => {
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const handler = def.handler
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if ( typeof handler !== 'string' ) {
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return (request: Request) => {
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return handler(request, request.response)
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}
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} else {
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const parts = handler.split('.')
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if ( parts.length < 2 ) {
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parts.push('apply') // default middleware method name, if none provided
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}
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const [middlewareName, methodName] = parts
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const middlewaresService = <Middlewares> this.make(Middlewares)
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const middlewareClass = middlewaresService.get(middlewareName)
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if ( !middlewareClass ) {
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const e = new ErrorWithContext('Middleware not found for route handler.')
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e.context = {
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handler,
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middlewareName,
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methodName,
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}
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throw e
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}
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return (request: Request) => {
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// If not a function, then we got a string reference to a middleware method
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// So, we need to use the request container to instantiate the middleware
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// and bind the method
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const middleware = <Middleware> request.make(middlewareClass, request)
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const method = middleware.getBoundMethod(methodName)
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return method()
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}
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}
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})
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.toArray()
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}
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/** Cast the route to an intelligible string. */
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toString(): string {
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const method = Array.isArray(this.method) ? this.method : [this.method]
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return `${method.join('|')} -> ${this.route}`
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}
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}
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