website/WIKI_UPGRADE.md

UOMysticmoon Website — Wiki Upgrade Spec

Branch: wiki-upgrade. This document is the contract for upgrading the CMS wiki from a flat single-table page store into a feature-complete wiki. It follows the project workflow: design (this doc) → build in phases → verify.

Companion to BACKEND_DESIGN.md; reuses its stack, auth, logging, and Docker decisions unchanged.

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1. Goal & scope

Turn the wiki into something that behaves like a typical wiki, while staying inside the existing Node/Express + MariaDB + React/Vite architecture and the staff-only auth model (admin/editor — no new roles, no public contributions).

In scope

Feature	Summary
Rich-text editing	TipTap (ProseMirror) WYSIWYG in the admin; outputs HTML
Sanitization	Server-side allowlist on save and client-side on render (fixes today's stored-XSS gap)
Categories / sections	First-class wiki_categories table; replaces hardcoded frontend blurbs
Drafts & publish	published + published_at, mirroring the posts pattern
Tags	Many-to-many tags with filtering
Internal links	[[slug]]-style links authored in the editor; red-link detection
Backlinks	"Linked from" list, maintained on save
Inline images	Reuse/generalize the existing multer upload for in-body images
Search	MariaDB FULLTEXT over title + body
Revision history	Per-save snapshots with view / diff / restore

Out of scope (this branch)

• Public/player editing or suggestion workflow, moderation/review queues.
• New roles or per-page ACLs (all staff with a login can edit all pages).
• Real-time collaborative editing, comments/discussion pages, file attachments other than images, page templates/transclusion, multilingual pages.

Decisions locked from planning

• Editor: TipTap, storing HTML (not Markdown, not JSON).
• Search: MariaDB FULLTEXT (no new infrastructure).
• Revision history and search are included (recommended additions beyond the minimum requested set).
• Authoring is admin + editor (isLoggedIn); no anonymous edits.

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2. Current state (baseline being replaced)

Layer	Today	File
Schema	flat wiki_pages(slug,title,body,updated_by,timestamps)	server/db/schema.sql:31
Model	thin CRUD by slug	server/src/model/wiki/wiki.db.js, wiki.model.js
Public API	GET /public/wiki, GET /public/wiki/:slug	public.controller.js:53
Admin API	GET/POST/PUT/DELETE /admin/wiki[...]	admin.controller.js:163, admin.routes.js:68
Public UI	card grid (hardcoded blurbs + Roman numerals), article w/ auto-TOC	Wiki.jsx, WikiArticle.jsx
Admin UI	raw-HTML <textarea> modal	WikiAdmin.jsx, WikiEditor.jsx
API client	api.wiki, api.admin.*Wiki	client/src/api/client.js:52

Known issues this upgrade resolves

• Stored XSS: body is raw HTML rendered with dangerouslySetInnerHTML and never sanitized (WikiArticle.jsx:91).
• Category blurbs and ordering are faked in the component (Wiki.jsx:11), not data.
• No drafts (every save is instantly public), no history, no search, no tags, no links.

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3. Data model

utf8mb4, InnoDB throughout. All changes are additive and idempotent so ensureSchema() upgrades existing databases on boot with no data loss. New columns are nullable or have safe defaults; existing pages default to published = 1 so nothing disappears on deploy.

3.1 wiki_categories (new)

col	type	notes
id	INT PK AI
slug	VARCHAR(120) UNIQUE NOT NULL	e.g. guides
title	VARCHAR(200) NOT NULL
description	VARCHAR(400) NULL	card teaser on the wiki index
sort_order	INT NOT NULL DEFAULT 0	manual ordering
created_at / updated_at	DATETIME	standard stamps

3.2 wiki_pages (altered)

Add to the existing table:

col	type	notes
category_id	INT NULL FK→wiki_categories(id) ON DELETE SET NULL
excerpt	VARCHAR(400) NULL	card/search teaser (replaces hardcoded blurbs)
published	TINYINT(1) NOT NULL DEFAULT 1	draft/publish toggle
published_at	DATETIME NULL	set on first publish
sort_order	INT NOT NULL DEFAULT 0	ordering within a category
FULLTEXT idx_wiki_search (title, body)		search

3.3 wiki_tags + wiki_page_tags (new)

wiki_tags( id PK, slug VARCHAR(120) UNIQUE, label VARCHAR(120) )
wiki_page_tags( page_id FK→wiki_pages ON DELETE CASCADE,
                tag_id  FK→wiki_tags  ON DELETE CASCADE,
                PRIMARY KEY(page_id, tag_id) )

3.4 wiki_links (new) — backlinks index

Rebuilt for a page on every save by parsing its body for internal links.

col	type	notes
source_page_id	INT FK→wiki_pages ON DELETE CASCADE
target_slug	VARCHAR(120) NOT NULL	may point at a not-yet-created page (red link)
INDEX idx_wiki_links_target (target_slug)		backlink lookups

Backlinks for page X = SELECT source pages WHERE target_slug = X.slug AND source is published.

3.5 wiki_revisions (new) — history

col	type	notes
id	INT PK AI
page_id	INT FK→wiki_pages ON DELETE CASCADE
title / body / excerpt	snapshot of content at save time
category_id	INT NULL	snapshot
editor_id	INT NULL FK→users(id)	who saved
change_note	VARCHAR(280) NULL	optional summary
created_at	DATETIME DEFAULT CURRENT_TIMESTAMP

A revision is written inside the same transaction as each page create/update.

3.6 Seed changes

Rework seed.js: the current 8 hardcoded pages become categories (title + the blurb currently living in the frontend), each seeded idempotently via a new seedDefaultCategory. Existing seeded pages are migrated/attached where applicable. seedDefault for pages stays INSERT IGNORE so reseeding is safe.

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4. Backend changes

Keep the model (entity) / db (SQL) split and the route grouping by access level.

4.1 Models (server/src/model/wiki/)

• wiki.db.js — add SQL for: category CRUD; page list with category, published, q (FULLTEXT) filters and ordering; tag upsert + attach/detach; wiki_links rebuild; revision insert/list/get; backlink query.
• wiki.model.js — orchestration. On create/update (single transaction):
  1. sanitize body with the allowlist (§6),
  2. upsert the page,
  3. insert a wiki_revisions snapshot,
  4. parse body for internal links → rebuild wiki_links for the page,
  5. sync tags.
• A small wiki.links.js helper: parse internal links out of the saved HTML (anchors written by the editor as href="/wiki/<slug>" / a data-wiki-slug attr), return the set of target slugs.

4.2 Public API (/api/v1/public)

Method	Path	Notes
GET	/wiki/categories	ordered categories with page counts
GET	/wiki?category=&tag=&q=	published only; list/filter/search summaries
GET	/wiki/:slug	page + category + tags + backlinks (published only)

Still passes through the siteMode maintenance gate like other public content.

4.3 Admin API (/api/v1/admin, behind isLoggedIn + noindex)

Method	Path	Purpose
GET	/wiki	all pages incl. drafts (filters: category, tag, q, status)
GET	/wiki/:slug	one page incl. draft, tags, category
POST	/wiki	create (slug, title, body, excerpt, category_id, tags, published)
PUT	/wiki/:slug	update (allows slug rename — see §7)
PATCH	/wiki/:slug/publish	{published} toggle, stamps published_at
DELETE	/wiki/:slug	delete (cascades revisions/links/tags)
GET	/wiki/:slug/revisions	list snapshots
GET	/wiki/:slug/revisions/:id	one snapshot (for diff/preview)
POST	/wiki/:slug/revisions/:id/restore	restore (writes a new revision)
GET/POST/PUT/DELETE	/wiki/categories[...]	category CRUD + reorder
GET/POST	/wiki/tags	list/create tags
POST	/uploads	generalized image upload (see §4.4) → {url}

Validation via express-validator (slug regex ^[a-z0-9-]+$, title required, etc.), centralized error handler unchanged. Every write logs to activity_log (wiki.create, wiki.update, wiki.publish, wiki.delete, wiki.revision.restore, wiki.category.*) following the existing convention.

4.4 Image uploads

Generalize the existing screenshot upload (multer config in admin.routes.js:17) into a shared POST /admin/uploads returning { url: "/uploads/<file>" }, reused by both the post editor and the wiki editor. Same size/mime limits. No new storage — served from the existing uploads/ volume.

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5. Frontend changes

5.1 Admin

• WikiEditor.jsx — replace the raw-HTML <textarea> with a TipTap editor: bold/italic/headings (H2 for TOC)/lists/quote/code, link tool, image insert (uploads via /admin/uploads), and an internal-link picker ([[-triggered autocomplete over existing slugs; flags red links). Adds: category dropdown, tag input (create-on-type), excerpt field, Save draft / Publish actions, and a History tab (revision list → preview → diff → restore).
• WikiAdmin.jsx — list gains status (draft/published), category column, and filters; plus a Categories manager (CRUD + drag-to-reorder).

5.2 Public

• Wiki.jsx — fully data-driven: categories + real excerpts from the API (delete the hardcoded BLURBS/ROMAN constants), a search box, optional tag filter.
• WikiArticle.jsx — keep auto-TOC; add category breadcrumb, tag chips, a "Linked from" backlinks section, "last updated by", and render via DOMPurify (dangerouslySetInnerHTML only after sanitize).

5.3 API client & routes

• Extend client/src/api/client.js with the new public/admin wiki calls (categories, search params, revisions, tags, uploads).
• Add a public search/category route if needed; admin categories view registered in App.jsx under /admin/wiki (sub-tab, no new top-level route required).

5.4 Dependencies (new)

• client: @tiptap/react, @tiptap/starter-kit, @tiptap/extension-link, @tiptap/extension-image (+ a small diff lib for history, e.g. diff); dompurify.
• server: sanitize-html.

(The client currently ships only React + react-router, so this is the first feature dependency addition — keep the bundle lean, import only the extensions used.)

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6. Security

• Two-layer sanitization. Server sanitizes on save with a strict sanitize-html allowlist (headings, p, lists, blockquote, code/pre, a[href], img[src,alt], strong/em, hr, table basics); strips scripts, event handlers, javascript: URLs, styles. Client re-sanitizes with DOMPurify before render. The stored value is already clean, so even direct DB edits or future API clients can't inject script.
• Upload safety unchanged from posts: mime allowlist (png/jpe/gif/webp/avif), 8 MB cap, random filenames, served as static files (no execution).
• Authorization: all mutating wiki/category/tag/upload routes stay behind isLoggedIn (admin or editor). Public routes are read-only and published-only.
• No secrets/logging changes; reuse existing rate-limit, helmet/CSP, noindex. CSP img-src already covers /uploads.

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7. Migration & backward compatibility

• Schema migration is additive; run by ensureSchema() on boot and shipped in schema.sql for fresh containers. Use ALTER TABLE ... ADD COLUMN IF NOT EXISTS / ADD INDEX guarded for idempotency (MariaDB 11 supports IF NOT EXISTS).
• Existing pages: published backfills to 1, published_at to updated_at, category_id left NULL (surface as "Uncategorized" until assigned).
• Slug rename (new capability): on PUT slug change, update the page slug and best-effort rewrite known internal links pointing at the old slug; old slug is not auto-redirected (acceptable for a staff-curated wiki) — note in release notes.
• Public API response shape is extended, not broken: existing fields (slug, title, body, updated_at) remain; new fields are additive, so the current frontend keeps working between phases.

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8. Implementation process (phased)

Each phase is a self-contained, shippable unit: build → run locally → verify in the browser preview → commit on wiki-upgrade. Open a PR into main at the end (or per phase if preferred). Do not merge a phase that hasn't been verified.

Phase 0 — Branch & scaffolding ✅ (this doc)

• wiki-upgrade branch created; this spec committed.

Phase 1 — Foundation & safety (highest value)

• Schema: add wiki_categories, alter wiki_pages (category_id, excerpt, published, published_at, sort_order, FULLTEXT), update seed.js.
• Server: server-side sanitization on save; drafts/publish endpoints; categories CRUD; public list filtered to published + categories endpoint.
• Client: data-driven Wiki.jsx (remove hardcoded blurbs); DOMPurify render in WikiArticle.jsx; draft/publish + category in the (still-textarea) admin editor.
• Exit check: existing pages still render; XSS payload in body is neutralized; draft pages hidden from the public list/article.

Phase 2 — Authoring UX

• TipTap editor replaces the textarea; generalized /admin/uploads; inline images.
• Exit check: create/edit a page with headings, a list, a link, and an inline image; verify it renders sanitized on the public page.

Phase 3 — Connectivity

• Internal [[slug]] links + red-link detection; wiki_links rebuild on save; backlinks on the article; tags + tag/category filtering.
• Exit check: link page A→B, confirm B shows A under "Linked from"; tag filter works.

Phase 4 — Discovery & trust

• FULLTEXT search (public search box + admin filter); revision history list / diff / restore.
• Exit check: search returns expected pages; edit a page twice, diff the revisions, restore an older one, confirm a new revision is recorded.

Verification (every phase)

Use the preview workflow, not manual hand-off: start the dev server, exercise the public wiki and the admin editor, check console/network for errors, and capture a screenshot of the changed surface. Confirm npm run lint/build passes for the client and the server boots cleanly with ensureSchema() applying the migration.

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9. File-change map (reference)

Area	Files
Schema/seed	server/db/schema.sql, server/db/seed.js, server/src/utils/db.js (ensureSchema)
Models	server/src/model/wiki/wiki.db.js, wiki.model.js, new wiki.links.js
API	server/src/router/v1/public/public.{routes,controller}.js, server/src/router/v1/admin/admin.{routes,controller}.js
Sanitize	new server/src/utils/sanitizeHtml.js
Client API	client/src/api/client.js
Public UI	client/src/routes/wiki/Wiki.jsx, WikiArticle.jsx
Admin UI	client/src/routes/admin/views/WikiAdmin.jsx, WikiEditor.jsx, new category manager + revisions view
Deps	client/package.json, server/package.json

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10. Open questions / assumptions

1. Slug redirects: assumed not needed on rename (staff wiki). Revisit if pages get external inbound links.
2. Search ranking: FULLTEXT natural-language mode assumed; can switch to BOOLEAN mode if operators are wanted later.
3. Diff granularity: line/word diff of the HTML source is assumed sufficient for revision compare; a rendered visual diff is a later nice-to-have.
4. Editor scope: tables and embeds beyond images are deferred unless requested.