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type ProxyOptions = {
method: "GET" | "POST" | "PUT" | "DELETE";
url: string;
timeoutMs: number;
body?: unknown;
headers?: Record<string, string>;
};
type JsonRecord = Record<string, unknown>;
function isRecord(value: unknown): value is JsonRecord {
return typeof value === "object" && value !== null;
}
function tryParseJson(text: string): unknown | undefined {
if (text.length === 0) {
return undefined;
}
try {
return JSON.parse(text) as unknown;
} catch {
return undefined;
}
}
function normalizeUpstreamError(status: number, payload: unknown): never {
if (isRecord(payload) && isRecord(payload.error)) {
const code = typeof payload.error.code === "string" ? payload.error.code : "UPSTREAM_ERROR";
const message = typeof payload.error.message === "string" ? payload.error.message : "Upstream request failed";
throw new AppError(status, code, message);
}
throw new AppError(status, "UPSTREAM_ERROR", "Upstream request failed");
}
/** Для произвольного fetch (multipart и т.д.): тело ошибки — JSON с `error`. */
export function throwIfUpstreamFailed(status: number, body: Buffer): void {
if (status < 400) {
return;
}
const payload = tryParseJson(body.toString("utf8"));
normalizeUpstreamError(status, payload);
}
export type ProxyRawSuccess = {
status: number;
body: Buffer;
contentType: string | undefined;
contentDisposition: string | undefined;
};
/**
* GET с телом как Buffer (GPX и т.д.).
* При `!response.ok` тело трактуется как JSON ошибки upstream → бросок `AppError` (как у `proxyJsonRequest`).
*/
export async function proxyUpstreamGetRaw(options: {
url: string;
headers?: Record<string, string>;
timeoutMs: number;
}): Promise<ProxyRawSuccess> {
const controller = new AbortController();
const timeout = setTimeout(() => controller.abort(), options.timeoutMs);
try {
const response = await fetch(options.url, {
method: "GET",
headers: options.headers ?? {},
signal: controller.signal,
});
const body = Buffer.from(await response.arrayBuffer());
if (!response.ok) {
const payload = tryParseJson(body.toString("utf8"));
normalizeUpstreamError(response.status, payload);
}
const contentType = response.headers.get("content-type") ?? undefined;
const contentDisposition = response.headers.get("content-disposition") ?? undefined;
return { status: response.status, body, contentType, contentDisposition };
} catch (error) {
if (error instanceof AppError) {
throw error;
}
if (error instanceof Error && error.name === "AbortError") {
throw new AppError(504, "UPSTREAM_TIMEOUT", "Upstream request timed out");
}
throw new AppError(502, "UPSTREAM_UNAVAILABLE", "Upstream service unavailable");
} finally {
clearTimeout(timeout);
}
}
export type ProxyJsonResult<T> = {
status: number;
body: T;
};
export async function proxyJsonRequestWithStatus<T>(
options: ProxyOptions,
): Promise<ProxyJsonResult<T>> {
const controller = new AbortController();
const timeout = setTimeout(() => controller.abort(), options.timeoutMs);
try {
const requestInit: RequestInit = {
method: options.method,
headers: {
"content-type": "application/json",
...(options.headers ?? {}),
},
signal: controller.signal,
};
if (options.body !== undefined) {
requestInit.body = JSON.stringify(options.body);
}
const response = await fetch(options.url, requestInit);
const text = await response.text();
const payload = tryParseJson(text);
if (!response.ok) {
normalizeUpstreamError(response.status, payload);
}
if (payload === undefined) {
throw new AppError(502, "UPSTREAM_INVALID_JSON", "Upstream returned invalid JSON");
}
return { status: response.status, body: payload as T };
} catch (error) {
if (error instanceof AppError) {
throw error;
}
if (error instanceof Error && error.name === "AbortError") {
throw new AppError(504, "UPSTREAM_TIMEOUT", "Upstream request timed out");
}
throw new AppError(502, "UPSTREAM_UNAVAILABLE", "Upstream service unavailable");
} finally {
clearTimeout(timeout);
}
}
export async function proxyUpstreamRedirect(options: {
url: string;
timeoutMs: number;
}): Promise<{ status: number; location: string }> {
const controller = new AbortController();
const timeout = setTimeout(() => controller.abort(), options.timeoutMs);
try {
const response = await fetch(options.url, {
method: "GET",
redirect: "manual",
signal: controller.signal,
});
if (response.status >= 300 && response.status < 400) {
const location = response.headers.get("location");
if (!location) {
throw new AppError(502, "UPSTREAM_ERROR", "Upstream redirect missing Location");
}
return { status: response.status, location };
}
const body = Buffer.from(await response.arrayBuffer());
const payload = tryParseJson(body.toString("utf8"));
normalizeUpstreamError(response.status, payload);
throw new AppError(502, "UPSTREAM_ERROR", "Upstream did not redirect");
} catch (error) {
if (error instanceof AppError) {
throw error;
}
if (error instanceof Error && error.name === "AbortError") {
throw new AppError(504, "UPSTREAM_TIMEOUT", "Upstream request timed out");
}
throw new AppError(502, "UPSTREAM_UNAVAILABLE", "Upstream service unavailable");
} finally {
clearTimeout(timeout);
}
}
export async function proxyJsonRequest<T>(options: ProxyOptions): Promise<T> {
const controller = new AbortController();
const timeout = setTimeout(() => controller.abort(), options.timeoutMs);
try {
const requestInit: RequestInit = {
method: options.method,
headers: {
"content-type": "application/json",
...(options.headers ?? {}),
},
signal: controller.signal,
};
if (options.body !== undefined) {
requestInit.body = JSON.stringify(options.body);
}
const response = await fetch(options.url, requestInit);
const text = await response.text();
const payload = tryParseJson(text);
if (!response.ok) {
normalizeUpstreamError(response.status, payload);
}
if (payload === undefined) {
throw new AppError(502, "UPSTREAM_INVALID_JSON", "Upstream returned invalid JSON");
}
return payload as T;
} catch (error) {
if (error instanceof AppError) {
throw error;
}
if (error instanceof Error && error.name === "AbortError") {
throw new AppError(504, "UPSTREAM_TIMEOUT", "Upstream request timed out");
}
throw new AppError(502, "UPSTREAM_UNAVAILABLE", "Upstream service unavailable");
} finally {
clearTimeout(timeout);
}
}
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