---
phase: 01-scraper-validation
plan: 01
subsystem: scraper
tags: [go, http, video-detection, content-validation, streaming]

# Dependency graph
requires: []
provides:
  - "URL validation pipeline with video marker detection (validateLinks)"
  - "Configurable validation timeout via SCRAPER_VALIDATE_TIMEOUT env var"
  - "Video content type and HTML marker detection functions"
affects: [02-health-checks, 04-link-extraction]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Pipeline filter pattern: scrapeReddit -> validateLinks -> merge"
    - "String-match video detection (no DOM parsing) for Phase 1 speed"
    - "2MB body limit for HTML inspection to prevent memory issues"

key-files:
  created:
    - internal/scraper/validate.go
    - internal/scraper/validate_test.go
  modified:
    - internal/scraper/scraper.go
    - main.go

key-decisions:
  - "String matching over DOM parsing for video detection (DOM reserved for Phase 4)"
  - "2MB body limit to prevent memory issues on large pages"
  - "3 redirect limit to avoid infinite redirect chains"

patterns-established:
  - "Pipeline filter: validate scraped links before merge into store"
  - "Env var config pattern: envDuration for timeout configuration"

requirements-completed: [SCRP-01, SCRP-02, SCRP-03, SCRP-04]

# Metrics
duration: 3min
completed: 2026-02-17
---

# Phase 1 Plan 1: Scraper Validation Summary

**URL validation pipeline with 18 video/player markers filtering scraped links before store merge, configurable via SCRAPER_VALIDATE_TIMEOUT**

## Performance

- **Duration:** 3 min
- **Started:** 2026-02-17T20:49:16Z
- **Completed:** 2026-02-17T20:51:54Z
- **Tasks:** 3
- **Files modified:** 4

## Accomplishments
- Created validate.go with 18 video/player markers covering HTML5, HLS, DASH, and 10+ player libraries
- Wired validateLinks into scrape() pipeline between URL extraction and store merge
- Added SCRAPER_VALIDATE_TIMEOUT env var (default 10s) following existing config patterns
- Added 25 unit tests (10 positive + 4 negative marker tests, 6 positive + 5 negative content type tests)

## Task Commits

Each task was committed atomically:

1. **Task 1: Create validate.go with video marker detection** - `adeb478` (feat)
2. **Task 2: Wire validation into scraper pipeline and add config** - `22d29db` (feat)
3. **Task 3: Add unit tests for validation functions** - `6c5cc02` (test)

## Files Created/Modified
- `internal/scraper/validate.go` - URL validation with video marker detection (validateLinks, hasVideoContent, containsVideoMarkers, isDirectVideoContentType)
- `internal/scraper/validate_test.go` - Table-driven unit tests for marker detection and content type checks (25 cases)
- `internal/scraper/scraper.go` - Added validateTimeout field and validateLinks call in scrape()
- `main.go` - Added SCRAPER_VALIDATE_TIMEOUT env var read (default 10s)

## Decisions Made
- Used string matching (not DOM parsing) for video detection -- DOM parsing reserved for Phase 4 link extraction
- Set 2MB body read limit to prevent memory issues on large streaming pages
- Limited redirects to 3 to avoid infinite redirect chains on sketchy stream sites
- Validation runs sequentially (not concurrent) to avoid overwhelming target sites

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Validation pipeline is integrated and tested, ready for health check layer (Phase 2)
- The validateLinks function provides the filtering foundation that health checks will build upon
- No blockers or concerns

## Self-Check: PASSED

All 5 files verified present. All 3 task commits verified in git log.

---
*Phase: 01-scraper-validation*
*Completed: 2026-02-17*