forward state query param to authorize (#51)

* Update authorize-endpoint.ts with state parameter

* fix: using typescript function

Author: JannikZed

src/authorize-endpoint.ts

@@ -1,13 +1,13 @@
 import crypto from "crypto";
-import type { Endpoint } from "payload";
+import type { Endpoint, PayloadRequest } from "payload";
 import type { PluginOptions } from "./types";
 
 export const createAuthorizeEndpoint = (
   pluginOptions: PluginOptions,
 ): Endpoint => ({
   method: "get",
   path: pluginOptions.authorizePath || "/oauth/authorize",
-  handler: async () => {
+  handler: async (req: PayloadRequest) => {
     const clientId = pluginOptions.clientId;
     const authCollection = pluginOptions.authCollection || "users";
     const callbackPath = pluginOptions.callbackPath || "/oauth/callback";
@@ -35,6 +35,10 @@ export const createAuthorizeEndpoint = (
       url.searchParams.append("auth_type", pluginOptions.authType);
     }
 
+    // Forward state from request query if available
+    const state = req.searchParams.get("state");
+    if (state) url.searchParams.append("state", state);
+
     url.searchParams.append("nonce", crypto.randomBytes(16).toString("hex"));
 
     return Response.redirect(url.toString());