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hono.ts
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hono.ts
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import { compose } from './compose.ts'
import { Context } from './context.ts'
import type { ExecutionContext } from './context.ts'
import { HTTPException } from './http-exception.ts'
import type { Router } from './router.ts'
import { METHOD_NAME_ALL, METHOD_NAME_ALL_LOWERCASE, METHODS } from './router.ts'
import { RegExpRouter } from './router/reg-exp-router/index.ts'
import { SmartRouter } from './router/smart-router/index.ts'
import { TrieRouter } from './router/trie-router/index.ts'
import type {
Env,
ErrorHandler,
H,
HandlerInterface,
MiddlewareHandler,
MiddlewareHandlerInterface,
Next,
NotFoundHandler,
OnHandlerInterface,
TypedResponse,
MergePath,
MergeSchemaPath,
} from './types.ts'
import type { RemoveBlankRecord } from './utils/types.ts'
import { getPathFromURL, mergePath } from './utils/url.ts'
type Methods = typeof METHODS[number] | typeof METHOD_NAME_ALL_LOWERCASE
interface RouterRoute {
path: string
method: string
handler: H
}
function defineDynamicClass(): {
new <E extends Env = Env, S = {}, BasePath extends string = ''>(): {
[M in Methods]: HandlerInterface<E, M, S, BasePath>
} & {
on: OnHandlerInterface<E, S, BasePath>
} & {
use: MiddlewareHandlerInterface<E, S, BasePath>
}
} {
return class {} as never
}
const notFoundHandler = (c: Context) => {
return c.text('404 Not Found', 404)
}
const errorHandler = (err: Error, c: Context) => {
if (err instanceof HTTPException) {
return err.getResponse()
}
console.trace(err)
const message = 'Internal Server Error'
return c.text(message, 500)
}
export class Hono<
E extends Env = Env,
S = {},
BasePath extends string = ''
> extends defineDynamicClass()<E, S, BasePath> {
readonly router: Router<H> = new SmartRouter({
routers: [new RegExpRouter(), new TrieRouter()],
})
readonly strict: boolean = true // strict routing - default is true
private _basePath: string = ''
private path: string = '*'
routes: RouterRoute[] = []
constructor(init: Partial<Pick<Hono, 'router' | 'strict'>> = {}) {
super()
// Implementation of app.get(...handlers[]) or app.get(path, ...handlers[])
const allMethods = [...METHODS, METHOD_NAME_ALL_LOWERCASE]
allMethods.map((method) => {
this[method] = (args1: string | H, ...args: H[]) => {
if (typeof args1 === 'string') {
this.path = args1
} else {
this.addRoute(method, this.path, args1)
}
args.map((handler) => {
if (typeof handler !== 'string') {
this.addRoute(method, this.path, handler)
}
})
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return this as any
}
})
// Implementation of app.on(method, path, ...handlers[])
this.on = (method: string | string[], path: string, ...handlers: H[]) => {
if (!method) return this
this.path = path
for (const m of [method].flat()) {
handlers.map((handler) => {
this.addRoute(m.toUpperCase(), this.path, handler)
})
}
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return this as any
}
// Implementation of app.use(...handlers[]) or app.get(path, ...handlers[])
this.use = (arg1: string | MiddlewareHandler, ...handlers: MiddlewareHandler[]) => {
if (typeof arg1 === 'string') {
this.path = arg1
} else {
handlers.unshift(arg1)
}
handlers.map((handler) => {
this.addRoute(METHOD_NAME_ALL, this.path, handler)
})
return this
}
Object.assign(this, init)
}
private clone(): Hono<E, S, BasePath> {
const clone = new Hono<E, S, BasePath>({
router: this.router,
strict: this.strict,
})
clone.routes = this.routes
return clone
}
private notFoundHandler: NotFoundHandler = notFoundHandler
private errorHandler: ErrorHandler = errorHandler
route<SubPath extends string, SubEnv extends Env, SubSchema, SubBasePath extends string>(
path: SubPath,
app: Hono<SubEnv, SubSchema, SubBasePath>
): Hono<E, RemoveBlankRecord<MergeSchemaPath<SubSchema, SubPath> | S>, BasePath>
/** @deprecated
* Use `basePath` instead of `route` with one argument.
* The `route` with one argument has been removed in v4.
*/
route<SubPath extends string>(path: SubPath): Hono<E, RemoveBlankRecord<S>, BasePath>
route<SubPath extends string, SubEnv extends Env, SubSchema, SubBasePath extends string>(
path: SubPath,
app?: Hono<SubEnv, SubSchema, SubBasePath>
): Hono<E, RemoveBlankRecord<MergeSchemaPath<SubSchema, SubPath> | S>, BasePath> {
const subApp = this.basePath(path)
if (!app) {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return subApp as any
}
app.routes.map((r) => {
const handler =
app.errorHandler === errorHandler
? r.handler
: async (c: Context, next: Next) =>
(await compose<Context>([r.handler], app.errorHandler)(c, next)).res
subApp.addRoute(r.method, r.path, handler)
})
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return this as any
}
basePath<SubPath extends string>(path: SubPath): Hono<E, S, MergePath<BasePath, SubPath>> {
const subApp = this.clone()
subApp._basePath = mergePath(this._basePath, path)
// eslint-disable-next-line @typescript-eslint/no-explicit-any
return subApp as any
}
onError(handler: ErrorHandler<E>) {
this.errorHandler = handler
return this
}
notFound(handler: NotFoundHandler<E>) {
this.notFoundHandler = handler
return this
}
showRoutes() {
const length = 8
this.routes.map((route) => {
console.log(
`\x1b[32m${route.method}\x1b[0m ${' '.repeat(length - route.method.length)} ${route.path}`
)
})
}
private addRoute(method: string, path: string, handler: H) {
method = method.toUpperCase()
if (this._basePath) {
path = mergePath(this._basePath, path)
}
this.router.add(method, path, handler)
const r: RouterRoute = { path: path, method: method, handler: handler }
this.routes.push(r)
}
private matchRoute(method: string, path: string) {
return this.router.match(method, path)
}
private handleError(err: unknown, c: Context<E>) {
if (err instanceof Error) {
return this.errorHandler(err, c)
}
throw err
}
private dispatch(
request: Request,
eventOrExecutionCtx?: ExecutionContext | FetchEvent,
env?: E['Bindings']
): Response | Promise<Response> {
const path = getPathFromURL(request.url, this.strict)
const method = request.method
const result = this.matchRoute(method, path)
const paramData = result?.params
const c = new Context(request, {
env,
executionCtx: eventOrExecutionCtx,
notFoundHandler: this.notFoundHandler,
path,
paramData,
})
// Do not `compose` if it has only one handler
if (result?.handlers.length === 1) {
const handler = result.handlers[0]
let res: ReturnType<H>
try {
res = handler(c, async () => {})
if (!res) {
return this.notFoundHandler(c)
}
} catch (err) {
return this.handleError(err, c)
}
if (res instanceof Response) return res
if ('response' in res) {
res = res.response
}
if (res instanceof Response) return res
return (async () => {
let awaited: Response | TypedResponse | void
try {
awaited = await res
if (awaited !== undefined && 'response' in awaited) {
awaited = awaited['response'] as Response
}
if (!awaited) {
return this.notFoundHandler(c)
}
} catch (err) {
return this.handleError(err, c)
}
return awaited
})()
}
const handlers = result ? result.handlers : [this.notFoundHandler]
const composed = compose<Context>(handlers, this.errorHandler, this.notFoundHandler)
return (async () => {
try {
const tmp = composed(c)
const context = tmp instanceof Promise ? await tmp : tmp
if (!context.finalized) {
throw new Error(
'Context is not finalized. You may forget returning Response object or `await next()`'
)
}
return context.res
} catch (err) {
return this.handleError(err, c)
}
})()
}
handleEvent = (event: FetchEvent) => {
return this.dispatch(event.request, event)
}
fetch = (request: Request, Env?: E['Bindings'] | {}, executionCtx?: ExecutionContext) => {
return this.dispatch(request, executionCtx, Env)
}
request = async (input: Request | string | URL, requestInit?: RequestInit) => {
if (input instanceof Request) {
if (requestInit !== undefined) {
input = new Request(input, requestInit)
}
return await this.fetch(input)
}
input = input.toString()
const path = /^https?:\/\//.test(input) ? input : `http://localhost${mergePath('/', input)}`
const req = new Request(path, requestInit)
return await this.fetch(req)
}
}