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import { config } from "shared/config";
import { getJWT } from "client/utils/getJWT";
import { addError } from "client/views/admin/adminSlice";
import {
ApiDevEndpoint,
ApiEndpoint,
AuthEndpoint,
} from "shared/constants/apiEndpoints";
import { ApiError } from "shared/types/api/errors";
import { store } from "client/utils/store";
export enum BackendErrorType {
NETWORK_ERROR = "backendError.networkError",
API_ERROR = "backendError.apiError",
UNAUTHORIZED = "backendError.unauthorized",
INVALID_REQUEST = "backendError.invalidRequest",
UNKNOWN = "backendError.unknown",
}
enum HttpMethod {
GET = "GET",
POST = "POST",
DELETE = "DELETE",
}
interface ApiResponse<T> {
data: T;
}
const baseURL = config.client().apiServerUrl;
const getErrorReason = (status: number): BackendErrorType => {
switch (status) {
case 401:
return BackendErrorType.UNAUTHORIZED;
case 422:
return BackendErrorType.INVALID_REQUEST;
default:
return BackendErrorType.UNKNOWN;
}
};
// Requests failing around a connectivity change are expected (e.g. laptop
// wakes from sleep and polls before Wi-Fi has reconnected), so the network
// error toast is suppressed while offline and briefly after reconnecting
const RECONNECT_GRACE_PERIOD_MS = 5000;
let reconnectedAt = 0;
addEventListener("online", () => {
reconnectedAt = Date.now();
});
const shouldShowNetworkError = (): boolean =>
navigator.onLine && Date.now() - reconnectedAt > RECONNECT_GRACE_PERIOD_MS;
const networkErrorResponse = <T>(): ApiResponse<T> => {
if (shouldShowNetworkError()) {
store.dispatch(addError(t(BackendErrorType.NETWORK_ERROR)));
}
const error: ApiError = {
errorId: "unknown",
message: "Network error",
status: "error",
};
return { data: error as T };
};
const apiFetch = async <T>(
url: string,
method: HttpMethod,
body?: unknown,
): Promise<ApiResponse<T>> => {
const headers: Record<string, string> = {
"Content-Type": "application/json",
};
const authToken = getJWT();
if (authToken) {
headers.Authorization = `Bearer ${authToken}`;
}
// Change to AbortSignal.timeout() at some point when browsers mature more
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), 60000);
let response: Response;
try {
response = await fetch(`${baseURL}${url}`, {
method,
headers,
body: body === undefined ? undefined : JSON.stringify(body),
signal: controller.signal,
});
} catch {
clearTimeout(timeoutId);
return networkErrorResponse<T>();
}
clearTimeout(timeoutId);
// Reading the response body can reject with AbortError if the page unloads
// mid-response, so json() calls need the same error handling as fetch()
// Handle redirect responses (301/302 with JSON body containing location)
if ([301, 302].includes(response.status)) {
let data: { location: string };
try {
data = (await response.json()) as { location: string };
} catch {
return networkErrorResponse<T>();
}
location.href = data.location;
// eslint-disable-next-line @typescript-eslint/no-empty-function
return new Promise<ApiResponse<T>>(() => {});
}
// Handle errors
Iif (!response.ok) {
const errorReason = getErrorReason(response.status);
store.dispatch(
addError(
t(BackendErrorType.API_ERROR, {
method,
url,
errorReason: t(errorReason),
}),
),
);
const error: ApiError = {
errorId: "unknown",
message: "Invalid API response",
status: "error",
};
return { data: error as T };
}
try {
const data = (await response.json()) as T;
return { data };
} catch {
return networkErrorResponse<T>();
}
};
type Endpoint = ApiEndpoint | ApiDevEndpoint | AuthEndpoint;
export const api = {
// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-parameters
post: async <RES = never, REQ = never>(
url: Endpoint,
data?: REQ,
): Promise<ApiResponse<RES>> => {
return await apiFetch<RES>(url, HttpMethod.POST, data);
},
// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-parameters
get: async <RES = never, REQ = never>(
url: Endpoint,
options?: { params?: REQ },
): Promise<ApiResponse<RES>> => {
let fetchUrl: string = url;
if (options?.params) {
const searchParams = new URLSearchParams(options.params);
fetchUrl = `${url}?${searchParams.toString()}`;
}
return await apiFetch<RES>(fetchUrl, HttpMethod.GET);
},
// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-parameters
delete: async <RES = never, REQ = never>(
url: Endpoint,
options?: { data?: REQ },
): Promise<ApiResponse<RES>> => {
return await apiFetch<RES>(url, HttpMethod.DELETE, options?.data);
},
};
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