feat: add share pages comments and server actions

lib/share/current-author.ts

@@ -0,0 +1,32 @@
+import "server-only";
+
+import { eq } from "drizzle-orm";
+import { getServerSession } from "next-auth";
+import { db } from "@/db";
+import { users } from "@/db/schema";
+import { getSessionDiscordId, type SessionWithDiscord } from "@/lib/auth/auth";
+import { authOptions } from "@/lib/auth/auth-options";
+import { ShareHttpError } from "@/lib/share/http-error";
+
+export async function requireShareAuthor() {
+  const session = await getServerSession(authOptions);
+  const discordId = getSessionDiscordId(session);
+  const userId = (session as SessionWithDiscord | null)?.user?.id;
+  if (!discordId || !userId) {
+    throw new ShareHttpError("Unauthorized", 401);
+  }
+
+  const [user] = await db
+    .select({ id: users.id, name: users.name, image: users.image })
+    .from(users)
+    .where(eq(users.id, userId))
+    .limit(1);
+  if (!user) throw new ShareHttpError("Unauthorized", 401);
+
+  return {
+    userId: user.id,
+    discordId,
+    displayName: user.name || session?.user?.name || "Discord user",
+    avatarUrl: user.image || session?.user?.image || null,
+  };
+}