diff --git a/server/service/posts/index.ts b/server/service/posts/index.ts
index 046ca88..637c110 100644
--- a/server/service/posts/index.ts
+++ b/server/service/posts/index.ts
@@ -166,6 +166,56 @@ export async function getPublicPostByPublicSlugAndSlug(publicSlug: string, postS
   return row ?? null;
 }
 
+export async function getPublicPostCommentContext(
+  publicSlug: string,
+  postSlug: string,
+): Promise<{ id: number; userId: number } | null> {
+  const slug = postSlug.trim();
+  if (!slug) {
+    return null;
+  }
+  const [row] = await dbGlobal
+    .select({
+      id: posts.id,
+      userId: posts.userId,
+    })
+    .from(posts)
+    .innerJoin(users, eq(posts.userId, users.id))
+    .where(
+      and(
+        eq(users.publicSlug, publicSlug),
+        eq(users.status, "active"),
+        eq(posts.visibility, "public"),
+        eq(posts.slug, slug),
+      ),
+    )
+    .limit(1);
+  return row ?? null;
+}
+
+export async function getUnlistedPostCommentContext(
+  publicSlug: string,
+  shareToken: string,
+): Promise<{ id: number; userId: number } | null> {
+  const [row] = await dbGlobal
+    .select({
+      id: posts.id,
+      userId: posts.userId,
+    })
+    .from(posts)
+    .innerJoin(users, eq(posts.userId, users.id))
+    .where(
+      and(
+        eq(users.publicSlug, publicSlug),
+        eq(users.status, "active"),
+        eq(posts.visibility, "unlisted"),
+        eq(posts.shareToken, shareToken),
+      ),
+    )
+    .limit(1);
+  return row ?? null;
+}
+
 export async function getUnlistedPost(publicSlug: string, shareToken: string) {
   const [row] = await dbGlobal
     .select({ post: posts })