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feat(stream): HLS default on + marketplace 30s pre-listen + FLAC tier checkbox (W4 Day 17)
Three pieces shipping under one banner since they're the day's
deliverables and share no review-time coupling :

1. HLS_STREAMING default flipped true
   - config.go : getEnvBool default true (was false). Operators wanting
     a lightweight dev / unit-test env explicitly set HLS_STREAMING=false
     to skip the transcoder pipeline.
   - .env.template : default flipped + comment explaining the opt-out.
   - Effect : every new track upload routes through the HLS transcoder
     by default ; ABR ladder served via /tracks/:id/master.m3u8.

2. Marketplace 30s pre-listen (creator opt-in)
   - migrations/989 : adds products.preview_enabled BOOLEAN NOT NULL
     DEFAULT FALSE + partial index on TRUE values. Default off so
     adoption is opt-in.
   - core/marketplace/models.go : PreviewEnabled field on Product.
   - handlers/marketplace.go : StreamProductPreview gains a fall-through.
     When no file-based ProductPreview exists AND the product is a
     track product AND preview_enabled=true, redirect to the underlying
     /tracks/:id/stream?preview=30. Header X-Preview-Cap-Seconds: 30
     surfaces the policy.
   - core/track/track_hls_handler.go : StreamTrack accepts ?preview=30
     and gates anonymous access via isMarketplacePreviewAllowed (raw
     SQL probe of products.preview_enabled to avoid the
     track→marketplace import cycle ; the reverse arrow already exists).
   - Trust model : 30s cap is enforced client-side (HTML5 audio
     currentTime). Industry standard for tease-to-buy ; not anti-rip.
     Documented in the migration + handler doc comment.

3. FLAC tier preview checkbox (Premium-gated, hidden by default)
   - upload-modal/constants.ts : optional flacAvailable on UploadFormData.
   - upload-modal/UploadModalMetadataForm.tsx : new optional props
     showFlacAvailable + flacAvailable + onFlacAvailableChange.
     Checkbox renders only when showFlacAvailable=true ; consumers
     pass that based on the user's role/subscription tier (deferred
     to caller wiring — Item G phase 4 will replace the role check
     with a real subscription-tier check).
   - Today the checkbox is a UI affordance only ; the actual lossless
     distribution path (ladder + storage class) is post-launch work.

Acceptance (Day 17) : new uploads serve HLS ABR by default ;
products.preview_enabled flag wires anonymous 30s pre-listen ;
checkbox visible to premium users on the upload form. All 4 tested
backend packages pass : handlers, core/track, core/marketplace, config.

W4 progress : Day 16 ✓ · Day 17 ✓ · Day 18 (faceted search)  ·
Day 19 (HAProxy sticky WS)  · Day 20 (k6 nightly) .

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-29 09:56:02 +02:00
..
web feat(stream): HLS default on + marketplace 30s pre-listen + FLAC tier checkbox (W4 Day 17) 2026-04-29 09:56:02 +02:00