added frontend + securing beta server invites

web/app/api/oauth/invite/route.ts

@@ -0,0 +1,66 @@
+import { NextRequest, NextResponse } from "next/server";
+import { cookies } from "next/headers";
+import crypto from "crypto";
+
+export const dynamic = 'force-dynamic';
+
+export async function GET(request: NextRequest) {
+    try {
+        const searchParams = request.nextUrl.searchParams;
+        const guildId = searchParams.get("guild_id");
+
+        if (!guildId) {
+            return new NextResponse("Missing guild_id", { status: 400 });
+        }
+
+        // Generate a random state for security
+        const state = crypto.randomBytes(16).toString("hex");
+
+        // Set the state in a secure cookie (HttpOnly, Secure, SameSite)
+        // This cookie allows us to verify the callback originated from this flow
+        const cookieStore = await cookies();
+        cookieStore.set("oauth_invite_state", state, {
+            httpOnly: true,
+            secure: process.env.NODE_ENV === "production",
+            sameSite: "lax",
+            maxAge: 300, // 5 minutes to complete the flow
+            path: "/",
+        });
+
+        // Store the target guild ID in a cookie too, to verify against the callback's guild_id
+        // This prevents someone from starting a flow for Guild A and swapping the callback to Guild B (though state mismatch would likely catch it too)
+        cookieStore.set("oauth_invite_guild", guildId, {
+            httpOnly: true,
+            secure: process.env.NODE_ENV === "production",
+            sameSite: "lax",
+            maxAge: 300,
+            path: "/",
+        });
+
+        const appUrl = process.env.APP_URL;
+        if (!appUrl) {
+            console.error("APP_URL env var is not set");
+            return new NextResponse("Configuration Error", { status: 500 });
+        }
+        const redirectUri = `${appUrl}/api/oauth/callback`;
+        const clientId = process.env.AUTH_DISCORD_ID;
+
+        // Construct Discord OAuth2 Authorization URL
+        // We use response_type=code because we enabled "Requires OAuth2 Code Grant" for the bot
+        const params = new URLSearchParams({
+            client_id: clientId as string,
+            permissions: "8", // Administrator (as requested in original link)
+            scope: "bot", // Add 'applications.commands' if needed, but 'bot' is the primary one here
+            redirect_uri: redirectUri,
+            response_type: "code",
+            state: state,
+            guild_id: guildId,
+            disable_guild_select: "true",
+        });
+
+        return NextResponse.redirect(`https://discord.com/oauth2/authorize?${params.toString()}`);
+    } catch (error) {
+        console.error("Failed to initiate invite flow:", error);
+        return new NextResponse("Internal Server Error", { status: 500 });
+    }
+}