feat: private forum groups - Group/GroupMember models, group CRUD API, invite codes, private threads, groups UI pages

src/app/api/groups/[id]/members/[memberId]/route.ts

@@ -0,0 +1,73 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+import { requireAuth } from "@/lib/auth";
+
+// DELETE /api/groups/[id]/members/[memberId] — remove member (owner only)
+export async function DELETE(
+  request: NextRequest,
+  { params }: { params: Promise<{ id: string; memberId: string }> }
+) {
+  try {
+    const auth = await requireAuth(request);
+    if (!auth) {
+      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+    }
+
+    const { id, memberId } = await params;
+
+    // Find the group and verify the requester is the owner
+    const group = await prisma.group.findUnique({
+      where: { id },
+    });
+
+    if (!group) {
+      return NextResponse.json({ error: "Group not found" }, { status: 404 });
+    }
+
+    if (group.ownerId !== auth.userId) {
+      return NextResponse.json(
+        { error: "Only the group owner can remove members" },
+        { status: 403 }
+      );
+    }
+
+    // Find the membership to remove
+    const membership = await prisma.groupMember.findUnique({
+      where: { id: memberId },
+    });
+
+    if (!membership) {
+      return NextResponse.json(
+        { error: "Member not found" },
+        { status: 404 }
+      );
+    }
+
+    if (membership.groupId !== id) {
+      return NextResponse.json(
+        { error: "Member does not belong to this group" },
+        { status: 400 }
+      );
+    }
+
+    // Cannot remove the owner
+    if (membership.role === "owner") {
+      return NextResponse.json(
+        { error: "Cannot remove the group owner" },
+        { status: 403 }
+      );
+    }
+
+    await prisma.groupMember.delete({
+      where: { id: memberId },
+    });
+
+    return NextResponse.json({ success: true });
+  } catch (error) {
+    console.error("DELETE /api/groups/[id]/members/[memberId] error:", error);
+    return NextResponse.json(
+      { error: "Internal server error" },
+      { status: 500 }
+    );
+  }
+}