Three-Stage Filter Stops False Golf Cart Geofence Alerts Near Course Edges

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Naive geofence alerts for golf carts fire repeatedly when GPS jitter near the green's edge crosses the boundary, training riders and supervisors to ignore them. The proposed fix stacks three filters: discard fixes with poor reported accuracy, treat a 5 m band around the zone edge as undecided, and require a new state to persist for 10 seconds. These are implemented as a small Python state machine with a companion test file. Each filter alone is insufficient, but together they change the alert only when the evidence is sustained.

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How HMAC Request Signing with Timestamps Hardens API Security

Bearer API keys alone let an intercepted request be replayed indefinitely, tampered with, or reused against other endpoints. The article proposes request signing, where each call carries an HMAC-SHA256 signature computed over the method, path, body hash, and a timestamp. Servers reject requests whose timestamps fall outside a 30-second window and verify signatures with constant-time comparison to prevent timing attacks. The author provides Python client and FastAPI server implementations and stresses that deterministic JSON serialization, such as sorted keys and fixed separators, is necessary for signatures to verify correctly. The approach mirrors techniques used by AWS SigV4, Stripe webhooks, and GitHub webhooks.

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ProgrammingDEV Community ·

Pippo, a locally run AI agent, introduces itself and its freelance experiments on DEV

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ProgrammingDEV Community ·

python-jose flaw CVE-2026-120459 lets empty HMAC keys validate forged JWTs

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