zitadel/apps/login/app/loginnames/route.ts

import {
  createSession,
  getSession,
  listAuthenticationMethodTypes,
  server,
} from "#/lib/zitadel";
import {
  SessionCookie,
  addSessionToCookie,
  getSessionCookieById,
} from "#/utils/cookies";
import { createSessionAndUpdateCookie } from "#/utils/session";
import { NextRequest, NextResponse } from "next/server";

export async function GET(request: NextRequest) {
  const { searchParams } = new URL(request.url);
  const sessionId = searchParams.get("sessionId");
  if (sessionId) {
    const sessionCookie = await getSessionCookieById(sessionId);

    const session = await getSession(
      server,
      sessionCookie.id,
      sessionCookie.token
    );

    const userId = session?.session?.factors?.user?.id;

    if (userId) {
      return listAuthenticationMethodTypes(userId)
        .then((methods) => {
          return NextResponse.json(methods);
        })
        .catch((error) => {
          return NextResponse.json(error, { status: 500 });
        });
    } else {
      return NextResponse.json(
        { details: "could not get session" },
        { status: 500 }
      );
    }
  } else {
    return NextResponse.json({}, { status: 400 });
  }
}

export async function POST(request: NextRequest) {
  const body = await request.json();
  if (body) {
    const { loginName } = body;

    const domain: string = request.nextUrl.hostname;

    return createSessionAndUpdateCookie(loginName, undefined, domain, undefined)
      .then((session) => {
        if (session.factors?.user?.id) {
          return listAuthenticationMethodTypes(session.factors?.user?.id)
            .then((methods) => {
              return NextResponse.json({
                authMethodTypes: methods.authMethodTypes,
                sessionId: session.id,
                factors: session.factors,
              });
            })
            .catch((error) => {
              return NextResponse.json(error, { status: 500 });
            });
        } else {
          throw "No user id found in session";
        }
      })
      .catch((error) => {
        return NextResponse.json(
          {
            details: "could not add session to cookie",
          },
          { status: 500 }
        );
      });
  } else {
    return NextResponse.error();
  }
}