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Let a dayTintProvider send its own colour

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Four tones cannot keep a twenty-stop trip's legs apart, which is most of
the point of colour-coding one. A contribution can now carry `#rrggbb`
alongside `tone`, per region or as a shorthand.

The split of control is: the plugin picks the hue, the host picks the
weight. A colour rides the same per-theme, per-region alphas as a tone,
and its OKLCH lightness is clamped into a per-theme band first, so no
contribution can hand a user a day card they can't read. The band
brackets the built-in tones rather than tightening around them, so an
ordinary colour passes through untouched and a hex equal to a tone
renders exactly like that tone. Hue and chroma are never touched - it
bounds a colour, it doesn't boost one, so a near-white grey still lands
as a faint tint.

Only `#rrggbb` survives normalization, and that is a security boundary
rather than tidying: the value ends up inside a `color-mix()` in an
inline `background`, a shorthand that takes a layer list, so a string
closing the paren early could append a `url(...)` and beacon everyone
viewing the trip.

A region gets exactly one paint instruction - what it names beats the
shorthand, a colour beats a tone at the same level - so the client never
has a tie to break. A region naming a colour the host can't use degrades
to `default` like a bogus tone already did.
This commit is contained in:
Renzo Beux
2026-07-30 15:37:20 -03:00
committed by Maurice
parent c89d2bf3a1
commit f718240ffc
12 changed files with 314 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files
server/src/nest/plugins/day-tints.controller.ts
+80 -20
View File
@@ -14,8 +14,14 @@ import { stripEmoji } from './text-sanitize';
*
* The card exposes three separately tintable regions — the day-number badge, the
* header row, and the expanded activity list — so a plugin can mark the leg boldly on
* the badge while leaving the dense activity list plain. `tone` is the shorthand that
* fills every region a contribution does not name.
* the badge while leaving the dense activity list plain. `tone` / `color` are the
* shorthands that fill every region a contribution does not name.
*
* A region is painted by a tone from the fixed palette or by the plugin's own
* `#rrggbb` — four tones cannot keep a twenty-leg trip's days apart. The split of
* control is: the plugin picks the hue, the host picks how strongly it lands (alpha
* per theme and per region) and clamps it into a readable lightness band, so no
* contribution can produce an unreadable card in either theme.
*
* Why this is its own hook rather than one dayScheduleProvider item per day: that
* hook is capped at MAX_ITEMS = 60 per provider, so a six-month trip would tint its
@@ -32,11 +38,16 @@ type Tone = 'default' | 'success' | 'warn' | 'danger';
export interface DayTint {
pluginId: string;
dayId: number;
/** Per-region tones, already resolved against the contribution's `tone` shorthand.
* An absent region is not tinted and renders exactly as it does without plugins. */
/** Per-region paint, already resolved against the contribution's shorthands. Each
* region carries EITHER a tone or a `#rrggbb` colour, never both — one region, one
* paint instruction, so the client never has to break a tie. An absent region is not
* tinted and renders exactly as it does without plugins. */
badgeTone?: Tone;
badgeColor?: string;
headerTone?: Tone;
headerColor?: string;
activityTone?: Tone;
activityColor?: string;
/** Optional tooltip on the tinted day ("Kanazawa leg"). */
label?: string;
}
@@ -44,6 +55,19 @@ export interface DayTint {
const TONES: ReadonlySet<string> = new Set(['default', 'success', 'warn', 'danger']);
const cap = (v: unknown, n: number): string => stripEmoji(String(v ?? '')).slice(0, n);
/**
* A plugin's own colour, or undefined for anything that is not exactly six hex digits.
*
* This is a security boundary, not input tidying. The client interpolates the value
* into a `color-mix()` inside an inline `background`, and `background` is a shorthand
* that takes a comma-separated layer list — a string closing the `color-mix(` paren
* early could append a `url(...)` layer and turn everyone viewing the trip into a
* beacon for the plugin's own server. Nothing but `#rrggbb` gets through.
*/
const HEX = /^#[0-9a-fA-F]{6}$/;
const hex = (v: unknown): string | undefined =>
typeof v === 'string' && HEX.test(v) ? v.toLowerCase() : undefined;
// Bound the work, not just the output: an all-invalid raw array (no entry ever
// reaching `out`) would otherwise be iterated in full. Slice up front, well above
// any legitimate payload — a trip has one tint per day, and 2000 days is 5½ years.
@@ -59,6 +83,39 @@ const MAX_RAW_TINTS = 2000;
const region = (v: unknown): Tone | undefined =>
v === undefined || v === null ? undefined : (TONES.has(v as string) ? (v as Tone) : 'default');
const named = (v: unknown): boolean => v !== undefined && v !== null;
/** One region of the card, resolved whole — a colour, a tone, or nothing. */
interface RegionTint { tone?: Tone; color?: string }
/**
* Resolve one region against the contribution's `tone` / `color` shorthands, in one
* order: what the region names beats the shorthand, and a colour beats a tone at the
* same level. A colour wins because it is the more specific request — and emitting
* only the winner keeps a tie out of the payload for the client to break.
*
* A region that names a colour the host cannot use (`badgeColor: 'chartreuse'`) and
* nothing else degrades to `default` rather than letting the shorthand answer for it —
* exactly what a bogus `badgeTone` already does. The plugin overrode the shorthand on
* purpose here; it just sent junk, and a silently untinted region is the harder
* failure for a plugin author to notice.
*/
function resolveRegion(
rawTone: unknown,
rawColor: unknown,
toneShorthand: Tone | undefined,
colorShorthand: string | undefined,
): RegionTint {
const color = named(rawColor) ? hex(rawColor) : undefined;
if (color) return { color };
const tone = region(rawTone);
if (tone) return { tone };
if (named(rawColor)) return { tone: 'default' };
if (colorShorthand) return { color: colorShorthand };
if (toneShorthand) return { tone: toneShorthand };
return {};
}
function normalize(pluginId: string, tripDayIds: ReadonlySet<number>, raw: unknown): DayTint[] {
const list = Array.isArray(raw) ? (raw as Array<Record<string, unknown>>).slice(0, MAX_RAW_TINTS) : [];
const out: DayTint[] = [];
@@ -72,22 +129,25 @@ function normalize(pluginId: string, tripDayIds: ReadonlySet<number>, raw: unkno
if (!Number.isInteger(dayId) || !tripDayIds.has(dayId) || seen.has(dayId)) continue;
seen.add(dayId);
const label = cap(it.label, 60);
const shorthand = region(it.tone);
let badgeTone = region(it.badgeTone) ?? shorthand;
let headerTone = region(it.headerTone) ?? shorthand;
let activityTone = region(it.activityTone) ?? shorthand;
// An entry that names no region and carries no shorthand still means "tint this
// day" — the dayId is the payload, the colour is decoration. Give it the default
// tone everywhere rather than returning a contribution that paints nothing.
if (!badgeTone && !headerTone && !activityTone) badgeTone = headerTone = activityTone = 'default';
out.push({
pluginId,
dayId,
...(badgeTone ? { badgeTone } : {}),
...(headerTone ? { headerTone } : {}),
...(activityTone ? { activityTone } : {}),
...(label ? { label } : {}),
});
const shTone = region(it.tone);
const shColor = hex(it.color);
const badge = resolveRegion(it.badgeTone, it.badgeColor, shTone, shColor);
const header = resolveRegion(it.headerTone, it.headerColor, shTone, shColor);
const activity = resolveRegion(it.activityTone, it.activityColor, shTone, shColor);
// An entry that names no region and carries no usable shorthand still means "tint
// this day" — the dayId is the payload, the colour is decoration. Give it the
// default tone everywhere rather than returning a contribution that paints nothing.
const painted = [badge, header, activity].filter((r) => r.tone || r.color);
if (painted.length === 0) badge.tone = header.tone = activity.tone = 'default';
const tint: DayTint = { pluginId, dayId };
if (badge.tone) tint.badgeTone = badge.tone;
if (badge.color) tint.badgeColor = badge.color;
if (header.tone) tint.headerTone = header.tone;
if (header.color) tint.headerColor = header.color;
if (activity.tone) tint.activityTone = activity.tone;
if (activity.color) tint.activityColor = activity.color;
if (label) tint.label = label;
out.push(tint);
}
return out;
}