feat: add device fingerprinting to referral anti-abuse system#362
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decentraland-bot wants to merge 4 commits intomainfrom
Open
feat: add device fingerprinting to referral anti-abuse system#362decentraland-bot wants to merge 4 commits intomainfrom
decentraland-bot wants to merge 4 commits intomainfrom
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- Add deviceFingerprint utility that generates a SHA-256 hash from stable browser properties (canvas, WebGL, screen, timezone, hardware) - Send fingerprint as x-device-fingerprint header on referral creation - Header is optional/backward-compatible: omitted if fingerprint is empty - Add comprehensive tests for both the utility and the hook Relates to decentraland/social-service-ea#400
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- Restructure tests using describe/when/and context-building pattern - Use lowercase describe sentences with 'when' for top-level contexts - Use 'should' prefix for it blocks describing expectations - Build context in nested describes with beforeEach setup - Move jest.clearAllMocks to afterEach instead of beforeEach - Properly separate identity-available vs identity-unavailable scenarios
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Summary
src/shared/utils/deviceFingerprint.ts) that generates a SHA-256 hash from stable browser properties (canvas rendering, WebGL renderer, screen dimensions, timezone, hardware concurrency)useTrackReferralhook to compute and send the fingerprint as anx-device-fingerprintheader on referral creation/update requestsHow It Works
The fingerprint is computed client-side from browser characteristics that remain stable across VPN/proxy changes:
These are hashed with SHA-256 into a hex string and sent as a request header. The backend (
social-service-ea) will read this header and apply aREFERRAL_MAX_DEVICE_MATCHESlimit per referrer, similar to the existing IP-based check.Why
IP-only detection is easily bypassed with VPN rotation. A user switching IPs will still produce the same device fingerprint, catching abuse that the current system misses.
Changes
src/shared/utils/deviceFingerprint.ts— New utilitysrc/shared/utils/deviceFingerprint.spec.ts— Tests for the utilitysrc/hooks/useTrackReferral.ts— Updated to include fingerprint headersrc/hooks/useTrackReferral.spec.ts— New comprehensive tests for the hookTesting
Related
social-service-eato readx-device-fingerprintheader and enforce device match limits🤖 Created via Slack with Claude
Requested by Braian Mellor via Slack