Functional Requirements (synthesized from SPEC §4–§7, acceptance §10)

The SPEC Тз расширение фаза1.md does not formally label itself as a PRD set, but sections 4–7 describe user-visible / functional behavior and §10 lists acceptance criteria. Per the orchestrator's instruction, these are extracted here as requirements with IDs derived REQ-{slug}.

Source key:

SPEC §X → Тз расширение фаза1.md, section X
DOC → README.md

All requirements below are sourced from the SPEC; the DOC is a confirming source unless noted otherwise.

REQ-video-ring-buffer

Source: Тз расширение фаза1.md §4.1
Scope: Continuous video capture of the active tab
Description: The extension MUST maintain an in-memory ring buffer containing the most recent 30 seconds of video from the currently active browser tab.
Acceptance criteria (from SPEC §10):
- Video buffer runs continuously on any tab.
- The buffer never holds more than 30 seconds of footage.
- The bundled last_30sec.webm from the exported archive plays back in a browser.
Technical bindings (see decisions.md):
- DEC-003 — chrome.tabCapture.capture() for acquisition
- DEC-003 — video/webm; codecs=vp9 @ 400 000 bps, 2000 ms chunks
- DEC-009 — header chunk retained indefinitely
Confirming source: README.md §"Использование" and §"Кольцевой буфер".

REQ-rrweb-dom-buffer

Source: Тз расширение фаза1.md §4.2
Scope: DOM event recording
Description: The extension MUST record DOM events via rrweb over a rolling 10-minute window from the active page, capped at 5 000 events.
Acceptance criteria (from SPEC §10):
- rrweb records DOM events without errors on typical pages (forms, tables, modal windows).
Technical bindings:
- DEC-004 — rrweb library
- DEC-004 — maskInputSelector for input[type=password] and [data-sensitive="true"]
- SPEC §8 — 5 000-event cap; oldest dropped on overflow
- SPEC §4.2 — 10-minute TTL purge every 60 s
Confirming source: README.md §"Кольцевой буфер".

REQ-user-event-log

Source: Тз расширение фаза1.md §4.3
Scope: User and runtime event logging
Description: The extension MUST log user and runtime events over a rolling 10-minute window.
Captured event types (SPEC §4.3):
- click — click on any element; records target selector and element text
- input — field value change (passwords excluded)
- navigation — popstate, hashchange, page transitions
- js_error — window.onerror, window.onunhandledrejection
- network_error — fetch / XMLHttpRequest with response code >= 400

Log entry schema (SPEC §4.3, verbatim):

{
  "timestamp": 1716800000000,
  "type": "click | input | navigation | error | network",
  "target": "CSS-селектор элемента",
  "value": "текст/значение (маскируется для паролей)",
  "url": "текущий URL",
  "meta": {}
}

Acceptance criteria (from SPEC §10):
- Event log captures clicks, navigation, and network errors.
- Passwords do not appear in either the event log or rrweb snapshots.
Confirming source: README.md §"Записываемые события".

REQ-screenshot-on-export

Source: Тз расширение фаза1.md §4.4, §5
Scope: One-shot visual capture
Description: At the moment the user clicks "Save archive", the extension MUST capture a PNG screenshot of the active tab via chrome.tabs.captureVisibleTab and include it as screenshot.png in the archive.
Technical binding: DEC-008.

Source: Тз расширение фаза1.md §5
Scope: User-facing trigger
Description: The extension MUST expose a minimal popup with a single button labeled "Сохранить отчёт об ошибке" and a sub-label "Последние 30 сек видео
- 10 мин лога".
Button state machine (SPEC §5):
- idle → Сохраняю... → Готово! ✓ → idle (after 3 s)
On-click behavior (SPEC §5):
1. Capture screenshot of active tab.
2. Request video buffer + event log from Service Worker.
3. Request rrweb snapshots from Content Script.
4. Assemble archive (see REQ-archive-layout).
5. Trigger download via chrome.downloads.download().
6. Display "Готово! ✓" status.
Confirming source: README.md §"Использование".

REQ-archive-layout

Source: Тз расширение фаза1.md §6
Scope: ZIP archive structure

Description: The archive MUST be named session_report_YYYY-MM-DD_HH-MM-SS.zip and contain exactly:

session_report_2025-05-15_14-32-10.zip
├── video/
│   └── last_30sec.webm         # склеенные чанки видеобуфера
├── rrweb/
│   └── session.json            # массив DOM-событий rrweb
├── logs/
│   └── events.json             # лог действий пользователя
├── screenshot.png              # скриншот в момент сохранения
└── meta.json                   # метаданные сессии

Acceptance criteria (from SPEC §10):
- Archive opens cleanly.
- last_30sec.webm plays back in a browser.
Confirming source: README.md §"Структура архива" (byte-identical layout).

REQ-meta-json-schema

Source: Тз расширение фаза1.md §6
Scope: Archive metadata

Description: meta.json inside the archive MUST conform to the schema:

{
  "timestamp": "2025-05-15T14:32:10Z",
  "url": "https://...",
  "userAgent": "Chrome/...",
  "extensionVersion": "1.0.0",
  "videoBufferSeconds": 30,
  "logDurationMinutes": 10,
  "totalEvents": 143
}

Fields are required (SPEC does not mark any optional).

REQ-manifest-permissions

Source: Тз расширение фаза1.md §7
Scope: Browser permission surface
Description: The extension MUST declare exactly the permission set in DEC-011 and MUST request user gesture for tabCapture on first activation.
Acceptance criteria (from SPEC §10):
- Extension installs in Chrome without errors.

REQ-archive-export-latency

Source: Тз расширение фаза1.md §10 (acceptance)
Scope: Performance — archive delivery
Description: From the moment the user clicks the export button, the ZIP archive MUST land in the "Downloads" folder in under 5 seconds.
Confirming source: README.md §"Критерии приёмки Фазы 1".

REQ-password-confidentiality

Source: Тз расширение фаза1.md §4.2, §4.3, §8, §10
Scope: Sensitive data handling
Description: Passwords MUST NOT appear in either rrweb snapshots or the user event log. Masking MUST be enforced by:
- rrweb maskInputSelector covering input[type=password] and [data-sensitive="true"]
- the event logger explicitly filtering value capture for password fields
Acceptance criteria (from SPEC §10):
- Passwords do not leak into either output stream.
Confirming source: README.md §"Маскирование чувствительных данных".

REQ-install-clean

Source: Тз расширение фаза1.md §10
Scope: Installability
Description: The extension MUST install in Chrome without errors via the unpacked-extension load flow.
Confirming source: README.md §"Установка расширения в Chrome".

Phase 1 Acceptance Criteria (full list, SPEC §10 verbatim)

For traceability, all SPEC §10 acceptance criteria are listed here once. Each is also referenced from one or more REQ-* entries above.

The extension installs in Chrome without errors. → REQ-install-clean, REQ-manifest-permissions
The video buffer runs continuously on any tab. → REQ-video-ring-buffer
The buffer always contains no more than 30 seconds of video. → REQ-video-ring-buffer
rrweb records DOM events without errors on typical pages (forms, tables, modal windows). → REQ-rrweb-dom-buffer
The event log captures clicks, navigation, and network errors. → REQ-user-event-log
On button press, the archive is downloaded to "Downloads" in < 5 seconds. → REQ-archive-export-latency
The archive opens; last_30sec.webm plays back in a browser. → REQ-archive-layout, REQ-video-ring-buffer
Passwords do not appear in the log or rrweb snapshots. → REQ-password-confidentiality
Extension RAM consumption does not exceed 50 MB in the background. → see constraints.md CON-ram-ceiling (NFR, not a functional REQ).

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