Implement secure cloud sandboxes with E2B (#35)

* chore: rename utils.ts to fileoperations.ts

* feat: replace node-pty with E2B sandboxes

* added debounced function in the editor

* fix: move socket connection to useRef

* fix: wait until terminals are killed to close the container

* fix: ensure container remains open until all owner connections are closed

* fix: sync files to container instead of local file system

* fix: set project file permissions so that they belong to the terminal user

* fix: use the container URL for the preview panel

* fix: count only the current user's sandboxes towards the limit

* fix: remove hardcoded reference to localhost

* fix: add error handling to the backend

* docs: add information about E2B

---------

Co-authored-by: Akhilesh Rangani <akhileshrangani4@gmail.com>

backend/database/src/index.ts

@@ -110,8 +110,13 @@ export default {
 				const body = await request.json()
 				const { type, name, userId, visibility } = initSchema.parse(body)
 
-				const allSandboxes = await db.select().from(sandbox).all()
-				if (allSandboxes.length >= 8) {
+				const userSandboxes = await db
+					.select()
+					.from(sandbox)
+					.where(eq(sandbox.userId, userId))
+					.all()
+
+				if (userSandboxes.length >= 8) {
 					return new Response("You reached the maximum # of sandboxes.", {
 						status: 400,
 					})