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103 lines
3.0 KiB
TypeScript
103 lines
3.0 KiB
TypeScript
/**
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* Pure avatar logic — marker parsing and the deterministic fallback.
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*
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* The marker format (persisted in the user record) is:
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* "" — deterministic icon+color derived from the username
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* "icon:<name>:<color>" — an explicitly picked icon and color (keys below)
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* "img:<version>" — an uploaded image served from /api/v1/auth/avatar
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*
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* Kept free of React/lucide imports so node unit tests can pin the behavior;
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* the UserAvatar component maps icon names to lucide components on top.
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*/
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// Same curated icon set as SessionAvatar, so the app keeps one visual voice.
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// Order matters: the fallback hash indexes into this list, so reordering or
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// removing entries silently reassigns every user's fallback avatar.
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export const AVATAR_ICON_NAMES: readonly string[] = [
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"sparkles",
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"sprout",
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"leaf",
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"feather",
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"cloud",
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"droplet",
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"sun",
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"moon",
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"flame",
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"star",
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"heart",
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"lightbulb",
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"compass",
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"cherry",
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"cookie",
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"music",
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];
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// Fixed hexes (not theme variables) so a user's chosen color reads the same
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// across Light/Dark/Snow/Glass themes; all carry white icons at 4.5:1+.
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export const AVATAR_COLORS: Record<string, string> = {
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violet: "#7c5fd3",
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blue: "#3f7cc8",
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teal: "#2a9d8f",
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green: "#4f9d4f",
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amber: "#c98a2d",
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rose: "#d05c7c",
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slate: "#6b7a8c",
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pink: "#bb5fb2",
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};
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export const AVATAR_COLOR_NAMES = Object.keys(AVATAR_COLORS);
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// Cheap, stable FNV-1a hash (same as SessionAvatar) so a username always maps
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// to the same fallback icon/color without anything persisted.
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function hashString(input: string): number {
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let h = 2166136261;
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for (let i = 0; i < input.length; i++) {
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h ^= input.charCodeAt(i);
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h = Math.imul(h, 16777619);
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}
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return h >>> 0;
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}
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export function fallbackAvatarFor(username: string): {
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icon: string;
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color: string;
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} {
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const hash = hashString(username || "user");
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return {
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icon: AVATAR_ICON_NAMES[hash % AVATAR_ICON_NAMES.length],
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// ">>>" not ">>": a signed shift of a hash >= 2^31 yields a negative
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// index, which would silently drop the background color entirely.
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color: AVATAR_COLOR_NAMES[(hash >>> 4) % AVATAR_COLOR_NAMES.length],
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};
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}
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export type AvatarDescriptor =
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| { kind: "image"; version: string }
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| { kind: "icon"; icon: string; color: string }
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| { kind: "fallback" };
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const ICON_MARKER_RE = /^icon:([a-z0-9-]+):([a-z0-9-]+)$/;
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/**
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* Classify an avatar marker. Unknown icon/color names (e.g. from a stale or
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* hand-edited user record) degrade to the deterministic fallback instead of
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* rendering a broken avatar.
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*/
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export function parseAvatarMarker(
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marker: string | null | undefined,
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): AvatarDescriptor {
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const value = (marker ?? "").trim();
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if (value.startsWith("img:")) {
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return { kind: "image", version: value.slice(4) };
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}
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const match = ICON_MARKER_RE.exec(value);
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if (
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match &&
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AVATAR_ICON_NAMES.includes(match[1]) &&
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AVATAR_COLORS[match[2]]
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) {
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return { kind: "icon", icon: match[1], color: match[2] };
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}
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return { kind: "fallback" };
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}
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