Adding support for an email login method and registering new users with the labeler backend.

website/pages/api/auth/[...nextauth].js

@@ -1,23 +1,82 @@
 import NextAuth from "next-auth";
 import DiscordProvider from "next-auth/providers/discord";
+import EmailProvider from "next-auth/providers/email";
 import { PrismaAdapter } from "@next-auth/prisma-adapter";
 
 import prisma from "../../../lib/prismadb";
 
 export const authOptions = {
+  // Ensure we can store user data in a database.
   adapter: PrismaAdapter(prisma),
   providers: [
+    // Register a Discord auth method.
     DiscordProvider({
       clientId: process.env.DISCORD_CLIENT_ID,
       clientSecret: process.env.DISCORD_CLIENT_SECRET,
     }),
+    // Register an email magic link auth method.
+    EmailProvider({
+      server: {
+        host: process.env.EMAIL_SERVER_HOST,
+        port: process.env.EMAIL_SERVER_PORT,
+        auth: {
+          user: process.env.EMAIL_SERVER_USER,
+          pass: process.env.EMAIL_SERVER_PASSWORD,
+        },
+      },
+      from: process.env.EMAIL_FROM,
+    }),
   ],
   callbacks: {
+    /**
+     * Includes the raw user id in the session object.
+     */
     async session({ session, token, user }) {
-      session.user.sub = token.sub;
+      session.user.id = user.id;
       return session;
     },
   },
+  events: {
+    /**
+     * When a new user signs in, we register them with the Labeler backend.
+     */
+    async signIn({ user, account, profile, isNewUser }) {
+      if (!isNewUser) {
+        return;
+      }
+      try {
+        // Register the new user with the Labeler Backend.
+        const res = await fetch(`${process.env.FASTAPI_URL}/api/v1/labelers`, {
+          method: "POST",
+          headers: {
+            "X-API-Key": process.env.FASTAPI_KEY,
+            "Content-Type": "application/json",
+          },
+          body: JSON.stringify({
+            discord_username: user.id,
+            display_name: user.name || user.email,
+            is_enabled: true,
+            notes: account.provider,
+          }),
+        });
+        if (res.status !== 200) {
+          console.error(res.statusText);
+          return;
+        }
+        // Update the User entry with the Labeler Backend's ID so we can
+        // reference it later.
+        const { id: labelerId } = await res.json();
+        await prisma.user.update({
+          where: { id: user.id },
+          data: {
+            labelerId,
+          },
+        });
+      } catch (error) {
+        console.error(error);
+      }
+    },
+  },
 };
 
 export default NextAuth(authOptions);