Add Discord verification option for users without email

src/actions/link-discord.ts

@@ -0,0 +1,55 @@
+"use server";
+
+import { prisma } from "@/lib/prisma";
+import { auth } from "@/lib/auth";
+
+export async function linkDiscordId(discordId: string): Promise<string | null> {
+  const session = await auth();
+  if (!session?.user?.id) return "Niet ingelogd";
+
+  const userId = Number(session.user.id);
+  if (!discordId || !/^\d{17,20}$/.test(discordId.trim())) {
+    return "Ongeldig Discord ID";
+  }
+
+  const discordIdClean = discordId.trim();
+
+  // Check if this Discord ID is already linked to another account.
+  try {
+    const existing = await prisma.socialAccounts.findUnique({
+      where: { provider_providerId: { provider: "discord", providerId: discordIdClean } },
+      select: { userId: true },
+    });
+    if (existing && Number(existing.userId) !== userId) {
+      return "Dit Discord ID is al gekoppeld aan een ander account";
+    }
+  } catch {
+    return "Fout bij controleren Discord ID";
+  }
+
+  try {
+    // Upsert: create or update the social_accounts entry.
+    await prisma.socialAccounts.upsert({
+      where: { provider_providerId: { provider: "discord", providerId: discordIdClean } },
+      create: {
+        userId: BigInt(userId),
+        provider: "discord",
+        providerId: discordIdClean,
+        createdAt: new Date(),
+        updatedAt: new Date(),
+      },
+      update: { userId: BigInt(userId), updatedAt: new Date() },
+    });
+
+    // Mark user as verified.
+    await prisma.user.update({
+      where: { id: userId },
+      data: { mailVerified: "1" },
+    });
+
+    return null; // success
+  } catch (e) {
+    console.error("[link-discord] Failed:", (e as Error).message);
+    return "Fout bij koppelen van Discord account";
+  }
+}