Miren

A shopper can read a product page and still not know whether it is doing anything on their own face. Miren answers “is this product working on my face?” with one flow: a YouCam Skin AI scan, catalog matches for the low scores, makeup virtual try-on on that same photo, and a later scan compared on measured raw scores. Scores are a cosmetic read, not a diagnosis, and a photo comparison cannot prove that a product caused a change.

Demo: https://miren-beta.vercel.app

git clone https://github.com/dovzhikova/miren.git

This repository is private. To share it with the YouCam hackathon, invite [email protected] (GitHub: Settings → Collaborators → Add people).

YouCam APIs

Credentialed calls stay on the server. When YOUCAM_API_KEY is set and live access is fully configured, Skin analysis and makeup try-on use the real YouCam APIs. Demo data never calls them.

Step	Endpoint
Register source image	POST /s2s/v2.0/file
Upload image bytes	Returned presigned PUT URL
Skin analysis	POST /s2s/v2.1/task/skin-analysis (HD or SD actions)
Poll analysis	GET /s2s/v2.1/task/skin-analysis/{task_id}
Makeup try-on	POST /s2s/v2.0/task/makeup-vto
Skin simulation	POST /s2s/v2.0/task/skin-simulation
Poll a preview	The matching task URL

Optional RSA handshake: POST /s2s/v1.0/client/auth when YOUCAM_PUBLIC_KEY is set, with fallback to the API-key bearer. See HACKATHON.md for the longer map.

Run

Use Node.js 22 or newer.

npm ci
cp .env.example .env.local
npm run dev

Open the URL printed by Next.js. No credentials are needed for Demo data.

Demo data and My scans

The header switches between two separate workspaces. Each has its own scans, cart, routine, saved products, and habit check-ins. The control stays in the header but is visually quiet.

• Live path (judged default when configured): if YouCam credentials, the session secret, and Upstash are all set, a first visit opens My scans. A selfie or upload is sent to YouCam Skin Analysis. Makeup Try this on calls Makeup VTO and shows the returned before/after. There is no silent fallback to generated scores, and the demo “try-on did not run” line is not shown on that path.
• Demo data: every score is generated, including scores for uploaded photos. No YouCam API call is made. The sample photo always enters this workspace, even if selected from My scans or when live credentials exist. A try-on in this workspace does not invent a render.
• Keys missing: one banner states that YouCam is not connected. Try-on reports that it did not run.
• Routine in demo mode: the first open shows a pre-seeded baseline and a follow-up 21 days later, labeled as a generated example, so the tracker is not an empty Pending state. Generate demo follow-up is still there.
• Generated follow-ups: available only in Demo data. They stay labeled as generated examples.

Existing glowcheck.v1 browser data is migrated to glowcheck.v2. Legacy generated follow-ups that inherited a live flag are moved into the demo history. Missing product baselines are reported instead of being replaced with unrelated scans.

Photos and privacy

Before a personal scan, the user agrees to photo processing. Photos pass through the route handler to YouCam; Miren has no server photo archive.

The browser keeps a small display thumbnail in localStorage and a separate API-quality image in IndexedDB. Previews read the source image, never the portrait thumbnail. If source storage is unavailable, an in-memory fallback works for that visit. After a reload, an unavailable original prompts a new scan.

Privacy and data explains this storage and provides a confirmed deletion action. It clears both workspaces, source images, saved products, check-ins, and the live-session cookie in this browser. It does not delete images already processed by YouCam.

Live configuration

Variable	Purpose
YOUCAM_API_KEY	Server-side YouCam bearer credential.
YOUCAM_PUBLIC_KEY	Optional RSA public key for the v1 handshake.
YOUCAM_API_BASE	Optional provider URL; defaults to https://yce-api-01.makeupar.com.
MIREN_FORCE_MOCK	1 disables live processing.
MIREN_SESSION_SECRET	Random secret of at least 32 characters for session and task signatures.
UPSTASH_REDIS_REST_URL	HTTPS endpoint for durable atomic request counters.
UPSTASH_REDIS_REST_TOKEN	Server-side Redis REST token.
KV_REST_API_URL	Alias for the REST URL when UPSTASH_REDIS_REST_URL is unset. Injected by the Vercel Marketplace Upstash integration.
KV_REST_API_TOKEN	Alias for the REST token when UPSTASH_REDIS_REST_TOKEN is unset.
MIREN_TASKS_PER_HOUR	Maximum task starts per anonymous session per hour, default 5.
MIREN_TASKS_PER_DAY	Maximum task starts across the deployment per UTC day, default 100.

The MIREN_ variables were named GLOWCHECK_ before the rename; the old names are still read when the new ones are unset.

Live routes fail closed if the session secret or quota service is missing or unavailable. A task start must come from this page (same-origin POST with an Origin header) and a valid session before the photo is decoded. Quota is reserved only after the photo is known to be usable, and before any paid provider call. Retries consume task-start quota too. These caps count tasks, not YouCam units or money. Choose caps to fit the provider account's allowance.

GET /api/config creates a signed HttpOnly, SameSite=Strict session cookie when live processing is configured. Cookies last 24 hours. Delayed jobs return signed task tokens bound to that session, action, source, capture date, and analysis profile. Poll tokens expire after 20 minutes. Polling accepts no arbitrary provider task ID and is limited to 60 requests per session per minute.

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