Revert "support rate limiting based on user IP (#342)"

This reverts commit 77677573c5f5a05c1c45d481089fd49e14709b10.

src/lib/types/MessageEvent.ts

@@ -3,5 +3,4 @@ import type { User } from "./User";
 
 export interface MessageEvent extends Pick<Timestamps, "createdAt"> {
 	userId: User["_id"] | User["sessionId"];
-	ip?: string;
 }

src/routes/conversation/[id]/+server.ts

@@ -17,7 +17,7 @@ import { error } from "@sveltejs/kit";
 import { ObjectId } from "mongodb";
 import { z } from "zod";
 
-export async function POST({ request, fetch, locals, params, getClientAddress }) {
+export async function POST({ request, fetch, locals, params }) {
 	const id = z.string().parse(params.id);
 	const convId = new ObjectId(id);
 	const date = new Date();
@@ -45,21 +45,10 @@ export async function POST({ request, fetch, locals, params, getClientAddress })
 		throw error(429, "Exceeded number of messages before login");
 	}
 
-	if (RATE_LIMIT !== "") {
-		let nEvents = 0;
-		if (locals.user?._id) {
-			// if logged in do rate limiting based on user id
-			nEvents = await collections.messageEvents.countDocuments({ userId });
-		} else {
-			// do rate limiting based on session id but also ip address
-			const nEventsIp = await collections.messageEvents.countDocuments({ ip: getClientAddress() });
-			const nEventsSession = await collections.messageEvents.countDocuments({ userId });
-			nEvents = Math.max(nEventsIp, nEventsSession);
-		}
+	const nEvents = await collections.messageEvents.countDocuments({ userId });
 
-		if (nEvents > parseInt(RATE_LIMIT)) {
-			throw error(429, ERROR_MESSAGES.rateLimited);
-		}
+	if (RATE_LIMIT != "" && nEvents > parseInt(RATE_LIMIT)) {
+		throw error(429, ERROR_MESSAGES.rateLimited);
 	}
 
 	const model = models.find((m) => m.id === conv.model);
@@ -162,7 +151,6 @@ export async function POST({ request, fetch, locals, params, getClientAddress })
 		await collections.messageEvents.insertOne({
 			userId: userId,
 			createdAt: new Date(),
-			ip: getClientAddress(),
 		});
 
 		await collections.conversations.updateOne(