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handler.ts
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handler.ts
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import { ConnInfo, Handler, Status, STATUS_TEXT } from "./deps.ts"
import {
AppMiddleware,
HandlerArgument,
MiddlewareArgument,
PathArgument,
RequestHandler,
Route,
Router,
StringHandler
} from "./types.ts"
import { router as appRouter } from "./router.ts"
import { render } from "./render.ts"
interface HandlerRoute {
method: string
path: PathArgument
url: string
host: string
handlers: HandlerArgument[]
}
interface HandlerMiddleware {
type: string
path: PathArgument
url: string
host: string
middlewares: MiddlewareArgument[]
}
export function handler() {
const EMPTY = ""
const SLASH = "/"
const DOUBLE_SLASH = "//"
const HASHTAG = "#"
const COLON = ":"
const handlerRoutes: Map<string, HandlerRoute> = new Map()
const handlerMiddlewares: HandlerMiddleware[] = []
let routerList: AppMiddleware[] = []
let hostname = EMPTY
let isInit = false
function buildMiddleware(
element: MiddlewareArgument,
prefix: PathArgument,
url: string,
) {
const middlewares: AppMiddleware[] = []
let args: MiddlewareArgument[] = []
if (Array.isArray(element)) {
args = <RequestHandler[]>element
} else {
args.push(<RequestHandler>element)
}
middlewares.push({ path: `${prefix}/.*`, middlewares: args, type: "" })
initHandlerMiddlewares(middlewares, url)
}
function buildRoutes(router: Router, prefix: PathArgument, url: string) {
const r = appRouter()
router.routes.forEach((element) => {
const path = element.path !== "/" ? element.path : ""
const newPath = `${prefix}${path}`
if (element.method === "GET") r.get(newPath, ...element.handlers)
if (element.method === "POST") r.post(newPath, ...element.handlers)
if (element.method === "PUT") r.put(newPath, ...element.handlers)
if (element.method === "DELETE") r.delete(newPath, ...element.handlers)
if (element.method === "OPTIONS") r.options(newPath, ...element.handlers)
if (element.method === "HEAD") r.head(newPath, ...element.handlers)
if (element.method === "PATCH") r.patch(newPath, ...element.handlers)
})
initHandlerRoutes(r.routes, url)
}
function isRouter(element: Router) {
return element.routes !== undefined
}
function loopRouterMiddleware(
object: MiddlewareArgument[],
prefix: PathArgument,
url: string,
) {
object.forEach((element) => {
if (isRouter(<Router>element)) {
buildRoutes(<Router>element, prefix, url)
} else {
buildMiddleware(element, prefix, url)
}
})
}
function handleRouterMiddleware(array: AppMiddleware[], url: string) {
for (let index = 0; index < array.length; index++) {
const element = array[index]
loopRouterMiddleware(element.middlewares, element.path, url)
}
}
function initAllMiddlewares(
middlewares: AppMiddleware[],
routes: Map<string, Route>,
req: Request,
) {
routerList = initHandlerMiddlewares(middlewares, req.url)
if (routerList.length > 0) {
handleRouterMiddleware(routerList, req.url)
}
initHandlerRoutes(routes, req.url)
isInit = true
}
function isStringHandler(stringResult: unknown) {
const str = <string>stringResult
try {
return (str.includes != undefined && str.replaceAll != undefined)
} catch (_error) {
throw new Error(`Handler return void`)
}
}
function isJSX(element: unknown) {
const el = <JSX.Element>element
return el.props != undefined && el.type != undefined
}
function handleRequest(
req: Request,
connInfo: ConnInfo,
routes: Map<string, Route>,
middlewares: AppMiddleware[],
): Response | Promise<Response> {
if (!isInit) initAllMiddlewares(middlewares, routes, req)
if (handlerMiddlewares.length > 0) {
const done = processHandlerMiddleware(handlerMiddlewares, req, connInfo)
if (!done) throw Error("Middleware execution not finished")
}
const res = handlerRoutes.get(createMapKey(req))
if (!res) {
return new Response(STATUS_TEXT.get(Status.NotFound), {
status: Status.NotFound,
})
}
const { length, [length - 1]: handler } = res.handlers
if (length > 1) return loopHandlers(res, req, connInfo)
if (!isHandler(handler)) throw new Error("The argument must be a handler")
const stringHandler = <StringHandler><unknown>handler
const stringResult = stringHandler(req, connInfo)
if (isStringHandler(stringResult)) {
return new Response(stringResult)
} else if (isJSX(stringResult)) {
return render(<JSX.Element><unknown>stringResult)
} else {
const appHandler = <Handler>handler
return appHandler(req, connInfo)
}
}
function processHandlerMiddleware(
handlerMiddlewares: HandlerMiddleware[],
req: Request,
connInfo: ConnInfo,
) {
const m = handlerMiddlewares.filter((v) => {
return (v.url === createArrayKey(req))
})
for (let index = 0; index < m.length; index++) {
const done = loopHandlerMiddleware(m[index].middlewares, req, connInfo)
if (!done) return false
}
return true
}
function loopHandlerMiddleware(
m: MiddlewareArgument[],
req: Request,
connInfo: ConnInfo,
) {
for (let index = 0; index < m.length; index++) {
const handler = m[index]
let done = false
if (Array.isArray(handler)) {
done = loopExecute(handler, req, connInfo)
} else done = execute(<RequestHandler>handler, req, connInfo)
if (!done) return false
}
return true
}
function loopHandlers(res: HandlerRoute, req: Request, connInfo: ConnInfo) {
for (let index = 0; index < res.handlers.length; index++) {
const handler = res.handlers[index]
let done = false
if (index === res.handlers.length - 1) {
if (!isHandler(handler)) {
throw new Error("The last argument must be a handler")
}
const appHandler = <Handler>handler
return appHandler(req, connInfo)
}
if (Array.isArray(handler)) done = loopExecute(handler, req, connInfo)
else done = execute(handler, req, connInfo)
if (!done) throw new Error("Middleware execution not finished")
}
return new Response(STATUS_TEXT.get(Status.InternalServerError), {
status: Status.InternalServerError,
})
}
function loopExecute(
handlers: RequestHandler[],
req: Request,
connInfo: ConnInfo,
) {
for (let index = 0; index < handlers.length; index++) {
const handler = handlers[index]
const done = execute(handler, req, connInfo)
if (!done) return false
}
return true
}
function execute(handler: RequestHandler, req: Request, connInfo: ConnInfo) {
if (!isRequestHandler(handler)) throw new Error("Invalid middleware")
return handleMiddleware(req, connInfo, <RequestHandler>handler)
}
function handleMiddleware(
req: Request,
connInfo: ConnInfo,
middleware: RequestHandler,
) {
let done = false
middleware(req, connInfo, (err) => {
if (err) throw err
done = true
})
return done
}
function createMapKey(req: Request): string {
let result = EMPTY
handlerRoutes.forEach((v) => {
if (
v.method === req.method && validateURL(v.url, req.url, v.host, v.path)
) {
result = `${req.method}${COLON}${v.url}`
}
})
return result
}
function createArrayKey(req: Request): string {
let result = EMPTY
handlerMiddlewares.forEach((v) => {
if (
validateURL(v.url, req.url, v.host, v.path)
) {
result = `${v.url}`
}
})
return result
}
function isRegex(regexPath: PathArgument) {
return regexPath instanceof RegExp
}
function validateURL(
routeURL: string,
incomingURL: string,
host: string,
regexPath: PathArgument,
) {
const incomingPath = incomingURL.replace(host, EMPTY).split(SLASH)
if (isRegex(regexPath)) {
const regex = new RegExp(regexPath)
return regex.test(incomingPath[1])
}
const routePath = routeURL.replace(host, EMPTY).split(SLASH)
if (routePath.length != incomingPath.length) return false
return parsePath(routePath, incomingPath)
}
function parsePath(route: string[], incoming: string[]) {
route.shift()
incoming.shift()
for (let idx = 0; idx < route.length; idx++) {
if (!isValidPath(route[idx], incoming, idx)) return false
}
return true
}
function isValidPath(path: string, incoming: string[], idx: number) {
return (path === incoming[idx] || regex(incoming[idx], path))
}
function regex(incoming: string, path: string) {
if (path) {
if (path.charAt(0) === COLON) return true
const regex = new RegExp(path)
return regex.test(incoming)
}
return false
}
function getRoute(req: Request): string {
let result = EMPTY
handlerRoutes.forEach((v) => {
if (
v.method === req.method && validateURL(v.url, req.url, v.host, v.path)
) {
result = v.url
}
})
return result
}
function extractParams(req: Request) {
const routeParams = getRoute(req).replace(hostname, EMPTY).split(SLASH)
const params = req.url.replace(hostname, EMPTY).split(SLASH)
routeParams.shift()
params.shift()
return routeParams
.map((val, idx) => {
return { val, idx }
})
.filter((v) => v.val.charAt(0) === COLON)
.map((v) => {
return {
name: v.val.replace(COLON, EMPTY),
value: params[v.idx],
}
})
}
function getParams(req: Request) {
if (!req) return {}
const obj: Record<string, string> = {}
extractParams(req).forEach((val) => obj[val.name] = val.value)
return obj
}
function getParam(name: string, req: Request) {
if (!req) return ""
const [res] = extractParams(req).filter((val) => val.name === name)
return res.value
}
function isRequestHandler(
handler: HandlerArgument,
): handler is RequestHandler {
const req = <RequestHandler>handler
return req.length === 3
}
function isHandler(
handler: HandlerArgument,
): handler is Handler {
const req = <Handler>handler
return req.length <= 2
}
function initHandlerMiddlewares(middlewares: AppMiddleware[], url: string) {
const [http, path] = url.split(DOUBLE_SLASH)
const [host] = path.split(SLASH)
hostname = `${http}${DOUBLE_SLASH}${host}`
const middlewareList = middlewares.filter((v) => {
return v.type !== "router"
})
const routerList = middlewares.filter((v) => {
return v.type === "router"
})
middlewareList.forEach((m) => {
const mdl: HandlerMiddleware = {
type: m.type,
path: m.path,
middlewares: m.middlewares,
url: `${hostname}${m.path}`,
host: hostname,
}
handlerMiddlewares.push(mdl)
})
middlewares = []
return routerList
}
function initHandlerRoutes(
map: Map<string, Route>,
url: string,
) {
const [http, path] = url.split(DOUBLE_SLASH)
const [host] = path.split(SLASH)
hostname = `${http}${DOUBLE_SLASH}${host}`
map.forEach((v, k) => {
const [method, , kpath] = k.split(HASHTAG)
const key = `${method}:${hostname}${kpath}`
handlerRoutes.set(key, {
method: v.method,
path: v.path,
url: `${hostname}${kpath}`,
host: hostname,
handlers: v.handlers,
})
})
map.clear()
}
function createHandler(
routes: Map<string, Route>,
middlewares: AppMiddleware[],
) {
return function (
req: Request,
connInfo: ConnInfo,
): Response | Promise<Response> {
return handleRequest(req, connInfo, routes, middlewares)
}
}
return {
createHandler,
getParams,
getParam,
}
}