Decoupling Authentication from Product Logic with an External Access Layer
This article discusses an architectural pattern for offloading complex authentication and access infrastructure to a dedicated external service, like Toqen.app. By integrating a lightweight SDK, product teams can avoid building and maintaining intricate login flows, session management, and security mechanisms within their core application, allowing them to focus on business logic. This approach aims to simplify development, enhance security by centralizing access control, and provide a more predictable architecture.
Read original on Dev.to #architectureAuthentication and access management often grow into significant subsystems within products, becoming challenging to modify and secure. This complexity arises from evolving login flows, security requirements, recovery scenarios, and abuse prevention mechanisms. The article presents an architectural solution: externalizing this access infrastructure to a specialized layer.
The External Access Layer Approach
Instead of implementing authentication within the product, an external access layer handles it. The product integrates with this layer via a lightweight SDK, minimizing the authentication-related code. This clear separation of concerns means the product no longer needs to manage login flows, session infrastructure, cryptographic verification, or abuse prevention.
- Product Responsibilities: Manages its own database, business logic, and core product functionality.
- Access Layer Responsibilities: Handles access infrastructure, sessions, and all security mechanisms related to authentication and authorization.
Architectural Benefits
This pattern leads to a more predictable architecture, reduces security-sensitive code within the product codebase, and minimizes infrastructure components for product teams to maintain. Security updates and improvements to the access infrastructure are managed by the specialized platform, freeing product teams to focus on core features.
Integration Example
The integration typically involves installing an SDK, initializing it with a site key and callbacks, and using middleware for authorization. The SDK's middleware automatically checks access cookies, validates signatures, decodes claims, and provides an access context to the request. An authorization function then verifies valid access, returning a 401 if unauthorized.
npm install @toqenapp/sdk
import { createToqen } from "@toqenapp/sdk"
const toqen = createToqen({
siteKey: "SITE_KEY",
mode: "development",
callbacks: { onLogin, onLogout }
})
app.use(toqen.middleware())
app.get(
"/dashboard",
toqen.authorize(),
(req, res) => {
res.send("Protected content")
}
)