type JsonValue = null | boolean | number | string | JsonValue[] | { [key: string]: JsonValue };
export class HttpError extends Error {
public readonly status: number;
public readonly url: string;
public readonly bodyText?: string;
constructor(message: string, opts: { status: number; url: string; bodyText?: string }) {
super(message);
this.name = 'HttpError';
this.status = opts.status;
this.url = opts.url;
this.bodyText = opts.bodyText;
}
}
export async function fetchJson(url: string, init: RequestInit & { timeoutMs?: number } = {}): Promise<JsonValue> {
const { timeoutMs = 8000, ...rest } = init;
const controller = new AbortController();
const timeout = setTimeout(() => controller.abort(), timeoutMs);
try {
const res = await fetch(url, { ...rest, signal: controller.signal });
const contentType = res.headers.get('content-type') ?? '';
const bodyText = await res.text();
if (!res.ok) {
throw new HttpError(`HTTP ${String(res.status)} 요청 실패`, { status: res.status, url, bodyText });
}
if (!contentType.toLowerCase().includes('application/json')) {
// Some APIs return JSON with non-standard content-type; still try to parse.
try {
return JSON.parse(bodyText) as JsonValue;
} catch {
throw new HttpError('JSON 응답이 아닙니다', { status: res.status, url, bodyText });
}
}
return JSON.parse(bodyText) as JsonValue;
} finally {
clearTimeout(timeout);
}
}
export function safeString(v: unknown): string {
if (typeof v === 'string') return v;
return String(v);
}
