Merged in feat/LOY-230-Microsoft-Entra-ID-Auth (pull request #2113)

Feat(LOY-230): DTMC Routes with Entra ID Auth & Error Page Handling

* feat(LOY-230): Link Scandic Friends and Azure accounts

* fix(LOY-230): remove employee id param setting

* fix(LOY-230): return token in jwt callback for auth.dtmc.ts


Approved-by: Michael Zetterberg
Approved-by: Christian Andolf

apps/scandic-web/app/[lang]/(live)/(public)/dtmc/route.ts

@@ -0,0 +1,45 @@
+import { NextResponse } from "next/server"
+import { AuthError } from "next-auth"
+
+import { dtmcApiCallback } from "@/constants/routes/dtmc"
+import { env } from "@/env/server"
+import { internalServerError, serviceUnavailable } from "@/server/errors/next"
+
+import { signIn } from "@/auth.dtmc"
+
+export async function GET() {
+  try {
+    const redirectUrl = await signIn(
+      "microsoft-entra-id",
+      {
+        redirectTo: `${env.PUBLIC_URL}${dtmcApiCallback}`,
+        redirect: false,
+      },
+      {
+        prompt: "login",
+      }
+    )
+
+    if (redirectUrl) {
+      console.log(`[dtmc] redirecting to: ${redirectUrl}`)
+      return NextResponse.redirect(redirectUrl)
+    } else {
+      console.error(`[dtmc] missing redirectUrl response from signIn()`)
+      return internalServerError(
+        "[dtmc] Missing redirect URL from authentication service"
+      )
+    }
+  } catch (error) {
+    if (error instanceof AuthError) {
+      console.error({ signInAuthError: error })
+      return serviceUnavailable(
+        "[dtmc] Microsoft authentication service unavailable"
+      )
+    } else {
+      console.error({ signInError: error })
+      return internalServerError(
+        "[dtmc] Unexpected error during authentication"
+      )
+    }
+  }
+}