Overcoming Geo-Blocking in Enterprise Features with TypeScript Strategies

Source: Dev.to

The Challenge

Geo‑blocked features rely on location‑based detection, often using IP geolocation or GPS data. In a distributed testing environment, it’s crucial to simulate various regions without deploying infrastructure worldwide. Traditional approaches using VPNs or proxy servers can be slow and unreliable for automated testing pipelines. The challenge is creating a controlled, programmable environment within the codebase to emulate geolocation data.

Solution Overview

Our approach hinges on intercepting and mocking the geolocation data within the application. Using TypeScript’s interfaces and dependency injection, we can create test doubles that feed location data dynamically. This strategy enables precise control over the environment, allowing tests to toggle between different regions seamlessly.

Implementing a Geolocation Service

We start by defining a clear interface for geolocation data:

interface Geolocation {
  countryCode: string;
  region: string;
  city: string;
  latitude: number;
  longitude: number;
}

Next, we create a service that fetches the location. In production, this service would query an external API; in tests, we inject a mock.

class GeoLocationService {
  constructor(private geolocationApi?: () => Geolocation) {}

  async getCurrentLocation(): Promise {
    if (this.geolocationApi) {
      return this.geolocationApi(); // Mocked data in tests
    }
    // production logic: API call
    const response = await fetch('https://api.ipgeolocation.io/ipgeo', {
      // API details
    });
    const data = await response.json();
    return {
      countryCode: data.country_code2,
      region: data.state_prov,
      city: data.city,
      latitude: parseFloat(data.latitude),
      longitude: parseFloat(data.longitude),
    };
  }
}

Using the Mock in Tests

// Test case with mock data
const mockGeo: Geolocation = {
  countryCode: 'US',
  region: 'California',
  city: 'San Francisco',
  latitude: 37.7749,
  longitude: -122.4194,
};

const mockService = new GeoLocationService(() => mockGeo);

// In actual feature logic
async function testFeature() {
  const location = await mockService.getCurrentLocation();
  // ... test logic based on location
}

Integrating with Feature Logic

Features that modify behavior based on location can now rely on this service. For example, an isFeatureAvailable() method can be controlled as follows:

async function isFeatureAvailable(service: GeoLocationService): Promise {
  const loc = await service.getCurrentLocation();
  // Example: activate feature only in US and Canada
  const allowedCountries = ['US', 'CA'];
  return allowedCountries.includes(loc.countryCode);
}

In production, we instantiate the service without a mock, allowing real geolocation data to dictate feature availability.

Benefits of this Approach

• Testability: Easily simulate any region without changing production code.
• Scalability: Supports automation testing pipelines with region‑specific scenarios.
• Maintainability: Clear separation between logic and environmental simulation, leveraging TypeScript’s strict typings.

Final Thoughts

Handling geo‑blocked features in enterprise environments requires a careful mix of architecture and testing strategies. By abstracting geolocation logic and utilizing dependency injection in TypeScript, we enable flexible, controlled testing environments. This approach not only ensures feature correctness across regions but also improves CI/CD workflows.

Adopting such patterns fosters resilient, scalable deployments that meet enterprise demands for global reach and reliability. For complex geo‑distribution scenarios, consider integrating feature toggles or CDN‑aware logic alongside these mocking strategies to further enhance testing fidelity of geo‑specific features.

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