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feat(status-pages): themeable public page with a live editor preview - #1938
Customer status pages, 6/6: themeable public page with a live preview
Theme (StatusPageTheme, stored per page in status_pages.theme and published in the snapshot)
Preset:default, mono, midnight or paper. Each defines a light and a dark token set.
Appearance:auto follows the visitor's light/dark preference; light and dark force one.
Overrides:accent, background, text, card, border (hex). In auto only the accent applies, because one background can't fit both modes. In light and dark all of them apply.
radius: none, sm, md or lg.
font: sans, serif or mono.
Status colours (operational, degraded, partial, major, maintenance) always come from the preset, so red always reads as an outage.
Safety and readability
The service lowercases and validates every value.
It rejects any theme whose text falls below WCAG AA (4.5:1) on the background or on cards, with a message such as "Text on the background has a contrast of 4.48:1; it needs at least 4.5:1."
The renderer re-checks the theme before any value reaches CSS. Out-of-schema values fall back to the defaults and every colour goes through safeColor, so even a corrupted snapshot can only emit known values.
Data:brand_color is replaced by theme. The migration adds the column, copies any valid brand_color into theme.accent, then drops the old column. In v2, theme replaces brand_color; create and update accept any subset of its fields.
Editor: Settings gets an Appearance section:
preset swatch cards;
an Auto/Light/Dark control;
colour fields, disabled in Auto, whose placeholders show the preset's colours;
corner and font selects;
an inline contrast warning that blocks saving.
Next to it, a live preview renders the real public page with the same @maple/status-page renderer the status Worker uses, in a script-less sandboxed iframe. It updates as you edit, and in Auto it has a preview-only Light/Dark toggle. The renderer adds about 7.5 KB gzipped to web, not counting effect and @maple/domain, which web already loads.
Tests
domain status-page: 24, covering preset resolution, overrides ignored in auto, and WCAG pairs (#777777 on white = 4.48:1, fails);
backend service and snapshot builder: 22, covering validation, lowercasing and contrast rejection;
api v2 status pages: 8; domain OpenAPI: 40;
renderer: 23, covering forced dark without the media query, radius and font, hostile values dropped, and auto ignoring overrides;
apps/status: 30;
web status pages: 39, covering Auto disabling the overrides, an unreadable pair blocking save, and the preview reflecting a changed accent;
db parity: 5.
Typecheck is clean across domain, db, backend, status-page, apps/status, api, ai, web and the alchemy stack. oxlint and oxfmt are clean, and knip adds nothing.
Screenshots (renderer output and the editor via a lab page; not yet on a live preview, see below)
Midnight, dark
Paper, serif, large corners
Mono font, square, red accent
Editor: Appearance section and live preview, and the contrast check blocking save.
Not preview-tested: five open PRs already hold preview labels and the shared Tinybird workspace is at its branch limit, so a preview for this PR would fail at "Create/refresh Tinybird PR branch". The rest of the stack was tested live on #1932's preview.
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Walkthrough
Status pages now use a structured theme instead of a single brand color. Theme values flow through the API, database, snapshots, and renderer. The editor adds theme controls, validation, and a sandboxed live preview.
Changes: Status-page theme
Layer / File(s)
Summary
Theme model and API contract packages/domain/src/status-page.ts, packages/domain/src/status-page.test.ts, packages/domain/src/http/status-pages.ts, packages/domain/src/http/v2/status-pages.ts
The domain defines theme presets, resolution, and contrast checks. API schemas expose full themes and partial create/update parameters. Older snapshots without a theme decode with the default.
The database stores a JSONB theme and the migration copies valid legacy colors into the accent. The service validates and normalizes themes; API create and update paths merge supplied values with defaults or current values. Records, snapshots, and responses carry the theme.
Theme rendering and preview snapshots packages/status-page/src/*, apps/web/package.json
The renderer sanitizes and resolves themes into CSS variables and theme-based styles. A preview snapshot helper builds component statuses and history from draft data and incidents.
Editor theme state and validation apps/web/src/page/alerts/status-pages/editor/form.ts, form.test.ts, message.ts, model.ts, update-settings.ts, update.ts, editor.scene.test.ts
The editor stores theme fields in settings, normalizes and validates colors, checks contrast, and submits theme data. Page and incident fetch completions also refresh the editor clock.
Appearance controls and live preview apps/web/src/page/alerts/status-pages/editor/view-appearance.ts, view-settings.ts, view-incidents.ts, editor.scene.test.ts
The settings view adds preset, appearance, color, radius, and font controls alongside a sandboxed preview. The preview uses draft values and supports light or dark selection for Auto appearance.
sequenceDiagram
participant Editor
participant previewPanel
participant previewDocument
participant previewSnapshot
participant renderDocument
participant sandboxedIframe
Editor->>previewPanel: provide draft theme and editor data
previewPanel->>previewDocument: request rendered draft page
previewDocument->>previewSnapshot: build snapshot from page, components, and incidents
previewDocument->>renderDocument: render the preview snapshot
renderDocument->>sandboxedIframe: provide rendered document
Loading
Possibly related PRs
MapleTechLabs/maple#1948: Changes related status-page theme, snapshot, API, editor, and renderer contracts.
MapleTechLabs/maple#1944: Adds configuration read and write using the theme model and editor settings introduced here.
MapleTechLabs/maple#1950: Replaces the status-page editor and adds live previews using related theme and rendering behavior.
Suggested labels:preview:web
Merge Risk: Low · up to 6241e
The live preview can misrepresent monitored outages or retain ended maintenance. These editor-preview discrepancies warrant owner awareness, but the current evidence does not show a public-page failure that blocks merging.
Pre-merge checks: 5
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Explanation
Description Check
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Title check
The title clearly and concisely describes the main changes: adding themes to public status pages and a live editor preview.
Docstring Coverage
No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
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Preview test: themes set in the dashboard reach the live page
Run on the preview:web deploy (pr-1938) by a separate agent with no context from this work. It drove the dashboard with headless Playwright, then read computed styles off the public page served by the status Worker.
#
Step
Result
1
Created a page with two components and a published incident; Publish now
PASS: create, components, incident and publish all 200
2
Default + Auto: public page for a light and a dark visitor
PASS: #fff/#0a0a0a vs #0a0a0a/#ededed
3
Midnight + Dark + accent #a5b4fc, viewed by a light-scheme visitor
PASS: still dark (rgb(11,16,32)), accent on links
4
Paper + Light + serif + large corners, viewed by a dark-scheme visitor
PASS: light paper background, serif stack, 14px card radius
5
Mono + Light with custom background, text, card and border, no corners, mono font
PASS: every override in the computed styles, radius 0
6
Text #777777 on #ffffff
PASS: "contrast of 4.48:1; it needs at least 4.5:1", Save disabled, a forced click sent no PATCH
PASS: the toggle changed only the preview, no unsaved-changes bar
8
GET /v2/status_pages/{id}
PASS: theme returned with the saved values
9
Hostile values (red;}body{display:none, url(...), bad preset or font) through the UI and the API
PASS: inline error in the UI, every API attempt 400, nothing saved
Fixed after the run (6c0a0cffc):
Unreadable accent. An accent saved on Midnight carried over to Paper and rendered links at 1.88:1. The accent now applies only in a mode where it reads at 4.5:1 on that background, and falls back to the text colour elsewhere. In Auto that usually means one of the two modes.
Light-preset status text below AA. On the light presets (Default, Mono, Paper), operational, degraded and partial text was below 4.5:1 (degraded was 3.05:1 on Default). Those shades are darker now, and a test checks every preset's status colours against its background and cards.
Future-dated relative times in the editor. The editor read the clock once, so times could read "in 1m". It now re-reads the clock on every fresh page or incident load.
Duplicate id in the incident dialog. The Title input shared its id with the dialog heading; the input has its own id now.
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Actionable comments posted: 2
🪄 Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix review comments
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at
@apps/web/src/page/alerts/status-pages/editor/view-appearance.ts:
- Around line 283-284: Update the incident history filter in the appearance
preview to exclude scheduled maintenance when its scheduled_end has passed, even
if resolved_at is null. Match the public snapshot builder’s end-time behavior
while preserving the existing resolved_at and history-window checks.
- Around line 323-324: Gate the settings-tab preview around the component,
monitor, and incident read states: render a loading or error state until all
three reads have data, rather than passing empty fallbacks through monitorsOf
and previewSnapshot. Only mark and render the preview as live once the snapshot
is complete.
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Commits
Reviewing files that changed from the base of the PR and between 2cd0e1a and 3959b0b.
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…cing brand_color
StatusPageTheme (preset, appearance, colour overrides, radius, font) with a pure resolver to
CSS tokens and a WCAG AA contrast check. The migration carries brand_color into theme.accent.
Create and update take a theme: hex colours lower-cased, unreadable text refused with the
contrast ratio. The snapshot publishes it, and v2 replaces brand_color with a theme object
whose omitted fields keep their current values.
…the editor
baseStyles takes the resolved theme: one forced token set or both behind the media query,
radius on cards, banners and bars, the font stack on body. Every value is re-checked
before it reaches CSS. previewSnapshot builds a snapshot from editor data.
Preset cards, a Light/Dark/Auto mode, colour overrides (disabled in Auto), corners and font,
all in the settings draft and save bar. Unreadable text shows its contrast and blocks the
save. A sandboxed iframe renders the public page from the draft, with a preview-only mode
toggle for Auto pages.
🟡 Confidence 6/10 · needs attention. Held at 6 because a correctness warning is open. 2 warnings −2 · 1 note · tests covered · risk high −1 · 4 defects fixed in earlier rounds
Replaces brand_color with a full page theme (preset, appearance, hex overrides, radius, font), validated to WCAG AA, and adds an Appearance editor with a live preview of the real public page. The card-contrast and partial-PATCH defects from the earlier review are fixed and pinned by tests; safe to merge.
["F6", "F7"]
theme replaces brand_color in the table, v2 API and snapshot, with a decoding default for old snapshots
themeContrastIssue refuses text or status colours under 4.5:1 on the background and cards
StatusPagesService.update merges a partial theme under a FOR UPDATE row lock
The editor renders the public page in a script-less sandbox="" iframe
6241ed0 · What was checked, coverage and telemetry details are on the Maple / review check. Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.
@maple-review-bot F6 and F7 are fixed in 6241ed0, as your own summary says, but they are still listed as open. F6: themeContrastIssue in packages/domain/src/status-page.ts now checks the status colours against the resolved background and card at 4.5:1 (test: "flags a card that keeps text readable but washes out the status labels"). F7: the PATCH passes the partial theme to StatusPagesService.update, which merges it onto the row read FOR UPDATE inside the transaction (test: "merges partial theme edits onto the stored theme, so two edits keep both fields"). Please mark both fixed. F2 (preview rebuild per keystroke) is won't fix for this stack: the editor in #1950 replaces this view.
That is the right pair: .status{font-size:14px;color:var(--c)} (packages/status-page/src/styles.ts:52) paints the status colour as label text. It runs per token set from visibleThemeTokens (status-page.ts:415), so the dark-mode twin is covered under appearance: "auto", and validateTheme refuses the theme at the API (StatusPagesService.ts:310-312). Pinned by packages/domain/src/status-page.test.ts:472.
F7 — fixed. The route passes the partial theme through (apps/api/src/routes/v2/status-pages.http.ts:228) and the merge happens on the row read under lock inside the transaction, with no earlier read feeding it:
findPage runs query.forUpdate() when lock is set (StatusPagesService.ts:445-446), so the stale-read window is gone. StatusPagesService.test.ts:134 runs both updates concurrently and asserts preset === "mono" and radius === "lg" both survive.
F2 — agreed, won't fix.#1950 carries 6260928 ("the status page is its own editor") and 14af37e ("drop the Alerts hub's Status pages tab and the old status page modules"), so editor/view-appearance.ts doesn't outlive this stack. Not worth optimising now.
Merged with 5 steps from "Before merge" still open. If they are done, tick them on the review comment; if not, now is the time.
Manual · Merge the db migration on the current chain and confirm parity.test.ts stays green in CI
Manual · Note the v2 brand_color → theme break for API consumers; an old field is now silently ignored
Manual · Regenerate the iOS client's apps/ios/Packages/MapleAPI/Sources/MapleAPI/openapi.json from the updated v2 spec
Migration · Check it is safe on production data and with the code still deployed
Migration · Check it is safe on production data and with the code still deployed
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Customer status pages, 6/6: themeable public page with a live preview
Theme (
StatusPageTheme, stored per page instatus_pages.themeand published in the snapshot)default,mono,midnightorpaper. Each defines a light and a dark token set.autofollows the visitor's light/dark preference;lightanddarkforce one.accent,background,text,card,border(hex). Inautoonly the accent applies, because one background can't fit both modes. Inlightanddarkall of them apply.radius: none, sm, md or lg.font: sans, serif or mono.Safety and readability
safeColor, so even a corrupted snapshot can only emit known values.Data:
brand_coloris replaced bytheme. The migration adds the column, copies any validbrand_colorintotheme.accent, then drops the old column. In v2,themereplacesbrand_color; create and update accept any subset of its fields.Editor: Settings gets an Appearance section:
Next to it, a live preview renders the real public page with the same
@maple/status-pagerenderer the status Worker uses, in a script-less sandboxed iframe. It updates as you edit, and in Auto it has a preview-only Light/Dark toggle. The renderer adds about 7.5 KB gzipped to web, not countingeffectand@maple/domain, which web already loads.Tests
Typecheck is clean across domain, db, backend, status-page, apps/status, api, ai, web and the alchemy stack. oxlint and oxfmt are clean, and knip adds nothing.
Screenshots (renderer output and the editor via a lab page; not yet on a live preview, see below)
Editor: Appearance section and live preview, and the contrast check blocking save.
Not preview-tested: five open PRs already hold preview labels and the shared Tinybird workspace is at its branch limit, so a preview for this PR would fail at "Create/refresh Tinybird PR branch". The rest of the stack was tested live on #1932's preview.
Stack: #1927 → #1928 → #1929 → #1930 → #1932 → #1938.
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Summary by CodeRabbit