Developer Builds Muffle, an Android App That Auto-Silences Phones in Mosques and Meetings

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A developer was inspired to create Muffle after repeatedly seeing ringtones interrupt quiet settings such as Friday prayers at a mosque. Rather than polling GPS, which drains batteries, the app uses Google Play Services' GeofencingClient so the operating system monitors location and wakes the app only on boundary transitions. The author notes a tradeoff: developers lose direct control over polling frequency, and triggers may arrive slightly late when signals are weak. Testing also revealed that geofence reliability varies across manufacturers, with some custom power-management systems killing background services or throttling broadcasts for apps that have not been opened recently.

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Developer shares standalone GitHub editions of open source tools he uses daily

A full-stack developer has published standalone editions of several well-known open source projects in his own GitHub account. The projects include public-apis, free-for-dev, markitdown, and ui-ux-pro-max-skill, each credited to its upstream source. He says he maintains these copies so his workflow keeps working if upstream repositories change, lets him pin specific versions, and applies consistent docs, dependency updates, CI, and linting. He encourages readers to star the original projects first and invites feedback on how others handle upstream updates.

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ProgrammingDEV Community ·

Developer Uses Regex Whitelist Before LLM to Safely Run Voice Commands

A developer built a voice-controlled home automation server for their website that lets users trigger actions like turning lights on or off or starting backups. To prevent spoken input from being turned into arbitrary shell commands, the system first checks the transcribed text against a strict regular-expression whitelist, rejecting anything that doesn't match a known pattern with a 400 error. Browser speech recognition via the Web Speech API sends the transcript to a Node.js server, where validated inputs are mapped to hardware parameters. A language model then generates the final command using a static prompt that never includes the raw user text, which guards against prompt injection. The author argues the regex gate adds negligible overhead while providing deterministic protection.

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ProgrammingDEV Community ·

Tenant-Aware Batch Processing for Document Summarization With Usage Accounting

The article argues that summarizing multiple documents should be treated as a small data pipeline rather than a simple loop over an API endpoint. It recommends tenant-aware batches with bounded inputs, idempotency keys, and usage recorded before results are shown, so each document maps to one accountable record. Usage should be a measured or deliberately estimated value tied to the amount of text processed rather than the document count. Manifests and usage events are kept longer than raw text, subject to privacy and contractual rules, and item-level failures should not halt the rest of a batch. Retries are permitted only when the previous attempt is known to have ended without a committed result or when an idempotency key protects the operation.

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ProgrammingDEV Community ·

Previewing a Site on a New Server Without Editing the Hosts File

Migrating a website typically involves editing the local hosts file to test it on a new server before changing DNS records. This works because browsers still send the real domain name in the HTTP Host header and TLS SNI, so the server responds as it would after a live DNS change. Visiting the server's bare IP address instead fails because the server cannot tell which site is requested. The approach has practical drawbacks: entries are local and hard to share with colleagues, wildcard subdomains are unsupported, and stock mobile devices cannot be edited. Firefox's DNS over HTTPS can also bypass the hosts file entirely, while Chrome generally still respects it.

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