Prevent banned users from creating new posts and comments

packages/frontpage/app/(app)/about/page.tsx

@@ -1,3 +1,9 @@
+import {
+  Heading1,
+  Paragraph,
+  Heading2,
+  TextLink,
+} from "@/lib/components/ui/typography";
 import { Metadata } from "next";
 import { ReactNode } from "react";
 
@@ -18,55 +24,33 @@ export default function CommunityGuidelinesPage() {
         Frontpage is a decentralised and federated link aggregator that's
         built on the same protocol as Bluesky.
       </Paragraph>
-
       <Heading2>Community Guidelines</Heading2>
-
       <Paragraph>
         We want Frontpage to be a safe and welcoming place for everyone. And so
         we ask that you follow these guidelines:
       </Paragraph>
-
       <ol className="my-6 ml-6 list-decimal [&>li]:mt-2">
         <li>
           Don&apos;t post hate speech, harassment, or other forms of abuse.
         </li>
         <li>Don&apos;t post content that is illegal or harmful.</li>
         <li>Don&apos;t post adult content*.</li>
       </ol>
-
       <small className="text-sm font-medium leading-none">
         * this is a temporary guideline while we build labeling and content
         warning features.
       </small>
-
       <Paragraph>
         Frontpage is moderated by it&apos;s core developers, but we also rely on
         reports from users to help us keep the community safe. Please report any
         content that violates our guidelines.
       </Paragraph>
+      <Heading2 id="contact">Contact</Heading2>
+      <Paragraph>
+        Email us at{" "}
+        <TextLink href="mailto:[email protected]">[email protected]</TextLink>
+        .
+      </Paragraph>
     </>
   );
 }
-
-function Heading1({ children }: { children: ReactNode }) {
-  return (
-    <h1 className="scroll-m-20 text-4xl font-extrabold tracking-tight lg:text-5xl">
-      {children}
-    </h1>
-  );
-}
-
-function Heading2({ children, id }: { children: ReactNode; id?: string }) {
-  return (
-    <h2
-      id={id}
-      className="mt-10 scroll-m-20 border-b pb-2 text-3xl font-semibold tracking-tight transition-colors first:mt-0"
-    >
-      {children}
-    </h2>
-  );
-}
-
-function Paragraph({ children }: { children: ReactNode }) {
-  return <p className="leading-7 [&:not(:first-child)]:mt-6">{children}</p>;
-}

packages/frontpage/app/(app)/layout.tsx

@@ -23,6 +23,7 @@ import { FRONTPAGE_ATPROTO_HANDLE } from "@/lib/constants";
 import { cookies } from "next/headers";
 import { revalidatePath } from "next/cache";
 import { NotificationIndicator } from "./_components/notification-indicator";
+import { TextLink } from "@/lib/components/ui/typography";
 
 export default async function Layout({
   children,
@@ -55,12 +56,11 @@ export default async function Layout({
       <footer className="flex justify-between items-center text-gray-500 dark:text-gray-400">
         <p>
           Made by{" "}
-          <a
+          <TextLink
             href={`https://bsky.app/profile/${FRONTPAGE_ATPROTO_HANDLE}`}
-            className="font-medium text-indigo-600 hover:text-indigo-500 dark:text-indigo-400 dark:hover:text-indigo-300"
           >
             @frontpage.fyi <OpenInNewWindowIcon className="inline" />
-          </a>
+          </TextLink>
         </p>
       </footer>
     </div>
@@ -98,12 +98,12 @@ async function LoginOrLogout() {
               <Link href={`/profile/${handle}`} className="cursor-pointer">
                 Profile
               </Link>
-            </DropdownMenuItem> 
-          <DropdownMenuItem asChild>
-            <Link href="/about" className="cursor-pointer">
-              About
-            </Link>
-          </DropdownMenuItem>
+            </DropdownMenuItem>
+            <DropdownMenuItem asChild>
+              <Link href="/about" className="cursor-pointer">
+                About
+              </Link>
+            </DropdownMenuItem>
             <Suspense fallback={null}>
               {isAdmin().then((isAdmin) =>
                 isAdmin ? (

packages/frontpage/app/(app)/post/[postAuthor]/[postRkey]/_lib/actions.tsx

@@ -14,14 +14,25 @@ import { createReport } from "@/lib/data/db/report";
 import { getVoteForComment } from "@/lib/data/db/vote";
 import { ensureUser } from "@/lib/data/user";
 import { revalidatePath } from "next/cache";
+import { isBanned } from "@/lib/data/db/user";
+import { TextLink } from "@/lib/components/ui/typography";
 
 export async function createCommentAction(
   input: { parentRkey?: string; postRkey: string; postAuthorDid: DID },
-  _prevState: unknown,
   formData: FormData,
 ) {
   const content = formData.get("comment") as string;
   const user = await ensureUser();
+  if (await isBanned(user.did)) {
+    return {
+      error: (
+        <>
+          Your account is currently banned from creating new comments.{" "}
+          <TextLink href="/about#contact">Contact us</TextLink> to appeal.
+        </>
+      ),
+    };
+  }
 
   const [post, comment] = await Promise.all([
     getPost(input.postAuthorDid, input.postRkey),
@@ -34,7 +45,7 @@ export async function createCommentAction(
   ]);
 
   if (!post) {
-    throw new Error("Post not found");
+    return { error: "Failed to create comment. Post not found." };
   }
 
   if (post.status !== "live") {

packages/frontpage/app/(app)/post/[postAuthor]/[postRkey]/_lib/comment-client.tsx

@@ -22,13 +22,7 @@ import {
   reportCommentAction,
 } from "./actions";
 import { ChatBubbleIcon, TrashIcon } from "@radix-ui/react-icons";
-import {
-  useActionState,
-  useRef,
-  useState,
-  useId,
-  startTransition,
-} from "react";
+import { useRef, useState, useId, startTransition, useTransition } from "react";
 import {
   VoteButton,
   VoteButtonState,
@@ -238,22 +232,32 @@ export function NewComment({
   textAreaRef?: React.RefObject<HTMLTextAreaElement>;
 }) {
   const [input, setInput] = useState("");
-  const [_, action, isPending] = useActionState(
-    createCommentAction.bind(null, { parentRkey, postRkey, postAuthorDid }),
-    undefined,
-  );
+  const action = createCommentAction.bind(null, {
+    parentRkey,
+    postRkey,
+    postAuthorDid,
+  });
+  const [isPending, startTransition] = useTransition();
   const id = useId();
+  const { toast } = useToast();
   const textAreaId = `${id}-comment`;
 
   return (
     <form
-      action={action}
       onSubmit={(event) => {
         event.preventDefault();
-        startTransition(() => {
-          action(new FormData(event.currentTarget));
+        startTransition(async () => {
+          const result = await action(new FormData(event.currentTarget));
           onActionDone?.();
-          setInput("");
+          if (result?.error) {
+            toast({
+              title: "Failed to create comment",
+              description: result.error,
+              type: "foreground",
+            });
+          } else {
+            setInput("");
+          }
         });
       }}
       aria-busy={isPending}

packages/frontpage/app/(app)/post/new/_action.ts → packages/frontpage/app/(app)/post/new/_action.tsx

@@ -1,9 +1,11 @@
 "use server";
 
+import { TextLink } from "@/lib/components/ui/typography";
 import { DID } from "@/lib/data/atproto/did";
 import { getVerifiedHandle } from "@/lib/data/atproto/identity";
 import { createPost } from "@/lib/data/atproto/post";
 import { uncached_doesPostExist } from "@/lib/data/db/post";
+import { isBanned } from "@/lib/data/db/user";
 import { DataLayerError } from "@/lib/data/error";
 import { ensureUser } from "@/lib/data/user";
 import { redirect } from "next/navigation";
@@ -26,6 +28,17 @@ export async function newPostAction(_prevState: unknown, formData: FormData) {
     return { error: "Invalid URL" };
   }
 
+  if (await isBanned(user.did)) {
+    return {
+      error: (
+        <>
+          Your account is currently banned from creating new posts.{" "}
+          <TextLink href="/about#contact">Contact us</TextLink> to appeal.
+        </>
+      ),
+    };
+  }
+
   try {
     const { rkey } = await createPost({ title, url });
     const [handle] = await Promise.all([

packages/frontpage/app/(app)/profile/[user]/page.tsx

@@ -23,6 +23,7 @@ import { ReportDialogDropdownButton } from "../../_components/report-dialog";
 import { reportUserAction } from "@/lib/components/user-hover-card";
 import { Metadata } from "next";
 import { LinkAlternateAtUri } from "@/lib/components/link-alternate-at";
+import { isBanned } from "@/lib/data/db/user";
 
 type Params = {
   user: string;
@@ -33,7 +34,7 @@ export async function generateMetadata(props: {
 }): Promise<Metadata> {
   const params = await props.params;
   const did = await getDidFromHandleOrDid(params.user);
-  if (!did) {
+  if (!did || (await isBanned(did))) {
     notFound();
   }
   const [handle, profile] = await Promise.all([

packages/frontpage/app/api/receive_hook/route.ts

@@ -17,6 +17,7 @@ import {
   unauthed_createCommentVote,
 } from "@/lib/data/db/vote";
 import { unauthed_createNotification } from "@/lib/data/db/notification";
+import { isBanned } from "@/lib/data/db/user";
 
 export async function POST(request: Request) {
   const auth = request.headers.get("Authorization");
@@ -31,6 +32,10 @@ export async function POST(request: Request) {
   }
 
   const { ops, repo, seq } = commit.data;
+  if (await isBanned(repo)) {
+    throw new Error("[naughty] User is banned");
+  }
+
   const service = await getPdsUrl(repo);
   if (!service) {
     throw new Error("No AtprotoPersonalDataServer service found");

packages/frontpage/lib/components/ui/typography.tsx

@@ -0,0 +1,48 @@
+import Link, { LinkProps } from "next/link";
+import { ReactNode } from "react";
+
+export function Heading1({ children }: { children: ReactNode }) {
+  return (
+    <h1 className="scroll-m-20 text-4xl font-extrabold tracking-tight lg:text-5xl">
+      {children}
+    </h1>
+  );
+}
+
+export function Heading2({
+  children,
+  id,
+}: {
+  children: ReactNode;
+  id?: string;
+}) {
+  return (
+    <h2
+      id={id}
+      className="mt-10 scroll-m-20 border-b pb-2 text-3xl font-semibold tracking-tight transition-colors first:mt-0"
+    >
+      {children}
+    </h2>
+  );
+}
+
+export function Paragraph({ children }: { children: ReactNode }) {
+  return <p className="leading-7 [&:not(:first-child)]:mt-6">{children}</p>;
+}
+
+export function TextLink({
+  href,
+  children,
+}: {
+  href: LinkProps["href"];
+  children: ReactNode;
+}) {
+  return (
+    <Link
+      href={href}
+      className="font-medium text-indigo-600 hover:text-indigo-500 dark:text-indigo-400 dark:hover:text-indigo-300"
+    >
+      {children}
+    </Link>
+  );
+}

packages/frontpage/lib/data/db/user.ts

@@ -2,6 +2,8 @@ import { db } from "@/lib/db";
 import { DID } from "../atproto/did";
 import * as schema from "@/lib/schema";
 import { isAdmin } from "../user";
+import { cache } from "react";
+import { and, eq } from "drizzle-orm";
 
 type ModerateUserInput = {
   userDid: DID;
@@ -35,3 +37,14 @@ export async function moderateUser({
       set: { isHidden: hide, labels: label, updatedAt: new Date() },
     });
 }
+
+export const isBanned = cache(async (did: DID) => {
+  const bannedUser = await db.query.LabelledProfile.findFirst({
+    where: and(
+      eq(schema.LabelledProfile.did, did),
+      eq(schema.LabelledProfile.isHidden, true),
+    ),
+  });
+
+  return Boolean(bannedUser);
+});