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open-gateway-front/src/utils/avatar.ts
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/**
* 默认头像样式(首字 / 剪影)公共源(YschTheme,scripts/sync-apps.mjs 下发三端 src/utils/avatar.ts)。
* 取值链与主题同构(theme-core.js resolveEffectiveThemeState 的合成链写法):
* URL ?yh-avatar=text|silhouette(仅预览/排障覆盖:只影响读、绝不写回)
* > localStorage["yh-avatar"](用户自选,纯字符串)
* > localStorage["yh-avatar-sch-default"](学校默认,UserHome 登录后写入)
* > "text"(系统默认)
* 值域恒为 "text" | "silhouette",键缺失/值非法均静默回落下一级,不报错不阻塞渲染。
* 渲染三态与取字规则的唯一契约见 UserHome《设置页修复与默认头像落地方案》§10.1/§10.2。
*/
export type AvatarStyle = "text" | "silhouette";
interface StorageLike {
getItem(k: string): string | null;
setItem(k: string, v: string): void;
removeItem(k: string): void;
}
export const AVATAR_STORAGE_KEY = "yh-avatar";
/** 学校默认头像存储键(UserHome 登录时写入;值格式与用户键相同,仅无"用户自选"语义) */
export const SCHOOL_DEFAULT_AVATAR_STORAGE_KEY = "yh-avatar-sch-default";
export const AVATAR_STYLES: readonly AvatarStyle[] = ["text", "silhouette"];
export const DEFAULT_AVATAR_STYLE: AvatarStyle = "text";
/** 值合法才采用(用户键/学校键同一判据;脏数据不生效) */
function readAvatarStyleOrNull(raw: string | null): AvatarStyle | null {
return raw === "text" || raw === "silhouette" ? raw : null;
}
/** URL 覆盖参数(?yh-avatar=text|silhouette):非法值忽略,且只影响"读哪一档"、绝不写回 localStorage */
function readAvatarOverride(): AvatarStyle | null {
try {
const search = (globalThis.location && globalThis.location.search) || "";
const m = new RegExp("[?&]yh-avatar=([^&]*)").exec(search);
return m ? readAvatarStyleOrNull(decodeURIComponent(m[1])) : null;
} catch {
/* 无 location 环境(测试/SSR):无覆盖 */
return null;
}
}
/**
* 生效样式合成(与 resolveEffectiveThemeState 同构):
* URL 覆盖 > localStorage["yh-avatar"](用户自选)> localStorage["yh-avatar-sch-default"](学校默认)
* > DEFAULT_AVATAR_STYLE。
*/
export function resolveAvatarStyle(storage: StorageLike | undefined = globalThis.localStorage): AvatarStyle {
let style: AvatarStyle | null = null;
if (storage) {
style = readAvatarStyleOrNull(storage.getItem(AVATAR_STORAGE_KEY));
if (!style) style = readAvatarStyleOrNull(storage.getItem(SCHOOL_DEFAULT_AVATAR_STORAGE_KEY));
}
if (!style) style = DEFAULT_AVATAR_STYLE;
return readAvatarOverride() || style;
}
/** 保存用户自选(直写 localStorage,无响应式;调用方操作后自行刷新 UI) */
export function saveAvatarStyle(style: AvatarStyle, storage: StorageLike | undefined = globalThis.localStorage): void {
try {
storage?.setItem(AVATAR_STORAGE_KEY, style);
} catch {
/* 隐私模式/配额失败静默:仅丢持久化,不丢本次会话生效 */
}
}
/** 跟随学校默认 = 删用户自选键(之后回落学校默认/系统默认) */
export function clearAvatarStyle(storage: StorageLike | undefined = globalThis.localStorage): void {
try {
storage?.removeItem(AVATAR_STORAGE_KEY);
} catch {
/* 隐私模式静默 */
}
}
/**
* 取字(顺序判定,先命中先返回):含 "@" 先截 "@" 前段(邮箱取首字母);
* 首字符必须用展开 [...s][0](禁用 charAt(0),避免代理对截半出乱码)。
* ASCII 字母转大写;纯数字回落 ""(剪影);符号/emoji/空白回落 ""(剪影);其余(CJK 等)原样。
*/
export function pickAvatarText(name: string | null | undefined): string {
let s = String(name ?? "");
const at = s.indexOf("@");
if (at > -1) s = s.slice(0, at);
const ch = [...s.trim()][0];
if (ch === undefined) return "";
if (/^[A-Za-z]$/.test(ch)) return ch.toUpperCase();
if (/^[0-9]$/.test(ch)) return "";
if (/^[\p{P}\p{S}\s]$/u.test(ch)) return "";
return ch;
}