fix: Prevent users from bypassing document limitations (#898)

## Description

**Fixed document limitation bypassing issues through templates.**
Previously, users could bypass document restrictions by utilizing
templates even after reaching their limitations. This fix ensures that
templates will no longer function as a workaround when users reach their
document limits.

## Changes
1. imported `useLimits` hook on `data-table-templates.tsx`
2. Disabled the 'Use Template' button when the user reaches their limit.
3. Added an Alert Component on top of the templates page to notify users
that they can't use templates anymore because they have reached their
limit.
4. Used `getServerLimits` hook on `template-router` to a condition on
the server.

## Example

![image](https://github.com/documenso/documenso/assets/87828904/275e83ea-ca7b-4b0e-83f4-ac10da9aff6a)

## Issue
Closes #883

apps/web/src/app/(dashboard)/templates/data-table-templates.tsx

@@ -2,13 +2,16 @@
 
 import { useState, useTransition } from 'react';
 
+import Link from 'next/link';
 import { useRouter } from 'next/navigation';
 
-import { Loader, Plus } from 'lucide-react';
+import { AlertTriangle, Loader, Plus } from 'lucide-react';
 
+import { useLimits } from '@documenso/ee/server-only/limits/provider/client';
 import { useUpdateSearchParams } from '@documenso/lib/client-only/hooks/use-update-search-params';
 import type { Template } from '@documenso/prisma/client';
 import { trpc } from '@documenso/trpc/react';
+import { Alert, AlertDescription, AlertTitle } from '@documenso/ui/primitives/alert';
 import { Button } from '@documenso/ui/primitives/button';
 import { DataTable } from '@documenso/ui/primitives/data-table';
 import { DataTablePagination } from '@documenso/ui/primitives/data-table-pagination';
@@ -36,6 +39,8 @@ export const TemplatesDataTable = ({
   const [isPending, startTransition] = useTransition();
   const updateSearchParams = useUpdateSearchParams();
 
+  const { remaining } = useLimits();
+
   const router = useRouter();
 
   const { toast } = useToast();
@@ -77,6 +82,19 @@ export const TemplatesDataTable = ({
 
   return (
     <div className="relative">
+      {remaining.documents === 0 && (
+        <Alert className="mb-4 mt-5">
+          <AlertTriangle className="h-4 w-4" />
+          <AlertTitle>Document Limit Exceeded!</AlertTitle>
+          <AlertDescription className="mt-2">
+            You have reached your document limit.{' '}
+            <Link className="underline underline-offset-4" href="/settings/billing">
+              Upgrade your account to continue!
+            </Link>
+          </AlertDescription>
+        </Alert>
+      )}
+
       <DataTable
         columns={[
           {
@@ -102,7 +120,7 @@ export const TemplatesDataTable = ({
               return (
                 <div className="flex items-center gap-x-4">
                   <Button
-                    disabled={isRowLoading}
+                    disabled={isRowLoading || remaining.documents === 0}
                     loading={isRowLoading}
                     onClick={async () => {
                       setLoadingStates((prev) => ({ ...prev, [row.original.id]: true }));

packages/trpc/server/template-router/router.ts

@@ -1,5 +1,6 @@
 import { TRPCError } from '@trpc/server';
 
+import { getServerLimits } from '@documenso/ee/server-only/limits/server';
 import { createDocumentFromTemplate } from '@documenso/lib/server-only/template/create-document-from-template';
 import { createTemplate } from '@documenso/lib/server-only/template/create-template';
 import { deleteTemplate } from '@documenso/lib/server-only/template/delete-template';
@@ -41,6 +42,12 @@ export const templateRouter = router({
       try {
         const { templateId } = input;
 
+        const limits = await getServerLimits({ email: ctx.user.email });
+
+        if (limits.remaining.documents === 0) {
+          throw new Error('You have reached your document limit.');
+        }
+
         return await createDocumentFromTemplate({
           templateId,
           userId: ctx.user.id,