84 lines
2.6 KiB
TypeScript
84 lines
2.6 KiB
TypeScript
/** 全局认证 fetch 客户端 */
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let tokenGetter: () => string | null = () => null;
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const inflightGetRequests = new Map<string, Promise<unknown>>();
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export class ApiRequestError extends Error {
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readonly status: number;
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readonly code: string | null;
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readonly retryable: boolean;
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constructor(message: string, status: number, code: string | null, retryable: boolean) {
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super(message);
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this.name = 'ApiRequestError';
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this.status = status;
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this.code = code;
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this.retryable = retryable;
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}
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}
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interface ApiErrorPayload {
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error?: unknown;
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message?: unknown;
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code?: unknown;
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retryable?: unknown;
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}
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export function setTokenGetter(fn: () => string | null) {
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tokenGetter = fn;
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}
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async function executeJsonRequest<T>(url: string, options: RequestInit | undefined, token: string | null): Promise<T> {
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const res = await fetch(url, {
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...options,
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headers: {
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...options?.headers,
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...(token ? { Authorization: `Bearer ${token}` } : {}),
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},
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});
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if (res.status === 401) {
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window.dispatchEvent(new CustomEvent('auth:unauthorized'));
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throw new Error('Unauthorized');
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}
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if (!res.ok) {
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let payload: ApiErrorPayload = {};
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try {
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const parsed: unknown = await res.json();
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if (typeof parsed === 'object' && parsed !== null) payload = parsed as ApiErrorPayload;
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} catch {
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payload = {};
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}
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const message = typeof payload?.error === 'string'
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? payload.error
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: typeof payload?.message === 'string'
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? payload.message
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: `请求失败（${res.status}）`;
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const code = typeof payload?.code === 'string' ? payload.code : null;
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const retryable = typeof payload?.retryable === 'boolean' ? payload.retryable : res.status >= 500;
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throw new ApiRequestError(message, res.status, code, retryable);
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}
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return res.json();
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}
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export async function fetchJson<T>(url: string, options?: RequestInit): Promise<T> {
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const token = tokenGetter();
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const method = (options?.method || 'GET').toUpperCase();
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const canDedupe = method === 'GET' && options?.body == null && options?.signal == null;
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if (!canDedupe) return executeJsonRequest<T>(url, options, token);
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const key = `${token || 'anonymous'}:${url}`;
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const existing = inflightGetRequests.get(key) as Promise<T> | undefined;
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if (existing) return existing;
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const request = executeJsonRequest<T>(url, options, token)
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.finally(() => {
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if (inflightGetRequests.get(key) === request) inflightGetRequests.delete(key);
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});
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inflightGetRequests.set(key, request);
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return request;
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}
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export function _clearApiClientInflightForTests(): void {
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inflightGetRequests.clear();
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}
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