Petbook

課題

CS2 はペットのフォトブックをプレイヤーのディスクにバイナリ形式で保存し、他人に見せる手段がありません。

実装したこと

ブックファイル（JPEG ページの Snappy ブロックと、ペット名と孵化時刻を持つ protobuf）を解析し、ゲームの Panorama ページロジックを移植して同一のページを描画。所有者専用のエディタは配置をゲーム自身のファイル名タグ形式で書き戻します。

アーキテクチャ

• Cloudflare Worker (TypeScript) — upload, viewer, owner API; no server to run
• R2 for photos and uploads, D1 (SQLite) for accounts, pages, templates and traffic counters
• Browser-side parsing of the cloud book file and pet.bin; only pages and the pet name are sent
• Steam OpenID sign-in with a signed cookie; strict CSP on profile pages; per-IP rate limits
• Personal pages with templates, music, effects and per-part analytics; site-wide analytics for the owner only

技術的ハイライト

• The 3D page turn, chapter bar, slot rules and photo crops match the game; text variants are chosen the same way the game does.
• Drag-and-drop editor: Library panel, slot rules, zoom and pan sliders, layout strips; edits save in the game's file-name tag format.
• Visitors are counted with a daily keyed hash; no IP address is stored. Bots and link-preview robots are ignored.

成果

• Anyone can share a book with a link; the pages render the same on a phone.
• Runs on the free tiers of Workers, R2 and D1.