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import RouteSubscriber from "./RouteSubscriber";
import { DashUserModel } from "./authentication/models/user_model";
import { Request, Response, Express } from 'express';
import { cyan, red, green } from 'colors';
import { Utils } from "../client/northstar/utils/Utils";
export enum Method {
GET,
POST
}
export interface CoreArguments {
req: Request;
res: Response;
isRelease: boolean;
}
export type AuthorizedCore = CoreArguments & { user: DashUserModel };
export type SecureHandler = (core: AuthorizedCore) => any | Promise<any>;
export type PublicHandler = (core: CoreArguments) => any | Promise<any>;
export type ErrorHandler = (core: CoreArguments & { error: any }) => any | Promise<any>;
export interface RouteInitializer {
method: Method;
subscription: string | RouteSubscriber | (string | RouteSubscriber)[];
secureHandler: SecureHandler;
publicHandler?: PublicHandler;
errorHandler?: ErrorHandler;
}
const registered = new Map<string, Set<Method>>();
enum RegistrationError {
Malformed,
Duplicate
}
export default class RouteManager {
private server: Express;
private _isRelease: boolean;
private failedRegistrations: { route: string, reason: RegistrationError }[] = [];
public get isRelease() {
return this._isRelease;
}
constructor(server: Express, isRelease: boolean) {
this.server = server;
this._isRelease = isRelease;
}
logRegistrationOutcome = () => {
if (this.failedRegistrations.length) {
let duplicateCount = 0;
let malformedCount = 0;
this.failedRegistrations.forEach(({ reason, route }) => {
let error: string;
if (reason === RegistrationError.Duplicate) {
error = `duplicate registration error: ${route} is already registered `;
duplicateCount++;
} else {
error = `malformed route error: ${route} is invalid`;
malformedCount++;
}
console.log(red(error));
});
console.log();
if (duplicateCount) {
console.log('please remove all duplicate routes before continuing');
}
if (malformedCount) {
console.log(`please ensure all routes adhere to ^\/$|^\/[A-Za-z]+(\/\:[A-Za-z?_]+)*$`);
}
process.exit(1);
} else {
console.log(green("all server routes have been successfully registered:"));
Array.from(registered.keys()).sort().forEach(route => console.log(cyan(route)));
console.log();
}
}
static routes: string[] = [];
/**
*
* @param initializer
*/
addSupervisedRoute = (initializer: RouteInitializer): void => {
const { method, subscription, secureHandler, publicHandler, errorHandler } = initializer;
typeof (initializer.subscription) === "string" && RouteManager.routes.push(initializer.subscription);
initializer.subscription instanceof RouteSubscriber && RouteManager.routes.push(initializer.subscription.root);
initializer.subscription instanceof Array && initializer.subscription.map(sub => {
typeof (sub) === "string" && RouteManager.routes.push(sub);
sub instanceof RouteSubscriber && RouteManager.routes.push(sub.root);
});
const isRelease = this._isRelease;
const supervised = async (req: Request, res: Response) => {
let { user } = req;
const { originalUrl: target } = req;
if (process.env.DB === "MEM" && !user) {
user = { id: "guest", email: "", userDocumentId: "guestDocId" };
}
const core = { req, res, isRelease };
const tryExecute = async (toExecute: (args: any) => any | Promise<any>, args: any) => {
try {
await toExecute(args);
} catch (e) {
console.log(red(target), user && ("email" in user) ? "<user logged out>" : undefined);
if (errorHandler) {
errorHandler({ ...core, error: e });
} else {
_error(res, `The server encountered an internal error when serving ${target}.`, e);
}
}
};
if (user) {
await tryExecute(secureHandler, { ...core, user });
} else {
req.session!.target = target;
if (publicHandler) {
await tryExecute(publicHandler, core);
if (!res.headersSent) {
res.redirect("/login");
}
} else {
res.redirect("/login");
}
}
setTimeout(() => {
if (!res.headersSent) {
console.log(red(`Initiating fallback for ${target}. Please remove dangling promise from route handler`));
const warning = `request to ${target} fell through - this is a fallback response`;
res.send({ warning });
}
}, 1000);
};
const subscribe = (subscriber: RouteSubscriber | string) => {
let route: string;
if (typeof subscriber === "string") {
route = subscriber;
} else {
route = subscriber.build;
}
if (!/^\/$|^\/[A-Za-z\*]+(\/\:[A-Za-z?_\*]+)*$/g.test(route)) {
this.failedRegistrations.push({
reason: RegistrationError.Malformed,
route
});
} else {
const existing = registered.get(route);
if (existing) {
if (existing.has(method)) {
this.failedRegistrations.push({
reason: RegistrationError.Duplicate,
route
});
return;
}
} else {
const specific = new Set<Method>();
specific.add(method);
registered.set(route, specific);
}
switch (method) {
case Method.GET:
this.server.get(route, supervised);
break;
case Method.POST:
this.server.post(route, supervised);
break;
}
}
};
if (Array.isArray(subscription)) {
subscription.forEach(subscribe);
} else {
subscribe(subscription);
}
}
}
export const STATUS = {
OK: 200,
BAD_REQUEST: 400,
EXECUTION_ERROR: 500,
PERMISSION_DENIED: 403
};
export function _error(res: Response, message: string, error?: any) {
console.error(message, error);
res.statusMessage = message;
res.status(STATUS.EXECUTION_ERROR).send(error);
}
export function _success(res: Response, body: any) {
res.status(STATUS.OK).send(body);
}
export function _invalid(res: Response, message: string) {
res.statusMessage = message;
res.status(STATUS.BAD_REQUEST).send();
}
export function _permission_denied(res: Response, message?: string) {
if (message) {
res.statusMessage = message;
}
res.status(STATUS.PERMISSION_DENIED).send("Permission Denied!");
}
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