85 lines
2.3 KiB
TypeScript
85 lines
2.3 KiB
TypeScript
import { Socket } from "socket.io"
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import Cookies from "cookies"
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import http from "http"
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import Koa from "koa"
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import { Header } from "@budibase/backend-core"
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/**
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* Constructs a fake Koa context to use for manually running middlewares in
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* sockets
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* @param app the Koa app
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* @param socket the socket.io socket instance
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* @param options additional metadata to populate the context with
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*/
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export const createContext = (
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app: Koa,
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socket: Socket,
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options?: WebsocketContextOptions
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) => {
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const res = new http.ServerResponse(socket.request)
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const context: WebsocketContext = {
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...app.createContext(socket.request, res),
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// Additional overrides needed to make our middlewares work with this
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// fake koa context
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resourceId: options?.resourceId,
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path: "/fake",
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request: {
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url: "/fake",
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headers: {
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[Header.APP_ID]: options?.appId,
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},
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},
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cookies: new Cookies(socket.request, res),
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get: (field: string) => socket.request.headers?.[field] as string,
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throw: (...params: any[]) => {
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// Throw has a bunch of different signatures, so we'll just stringify
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// whatever params we get given
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throw new Error(
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...(params?.join(" ") || "Unknown error in socket middleware")
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)
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},
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// Needed for koa-useragent middleware
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headers: socket.request.headers,
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header: socket.request.headers,
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}
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return context
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}
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/**
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* Runs a list of middlewares, nesting each callback inside each other to mimic
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* how the real middlewares run and ensuring that app and tenant contexts work
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* as expected
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* @param ctx the Koa context
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* @param middlewares the array of middlewares to run
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* @param callback a final callback for when all middlewares are completed
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*/
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export const runMiddlewares = async (
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ctx: any,
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middlewares: any[],
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callback: Function
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) => {
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if (!middlewares[0]) {
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await callback()
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} else {
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await middlewares[0](ctx, async () => {
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await runMiddlewares(ctx, middlewares.slice(1), callback)
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})
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}
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}
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export interface WebsocketContext extends Omit<Koa.Context, "request"> {
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request: {
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url: string
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headers: {
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[key: string]: string | undefined
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}
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}
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cookies: Cookies
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}
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export interface WebsocketContextOptions {
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appId?: string
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resourceId?: string
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}
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