82 lines
2.1 KiB
TypeScript
82 lines
2.1 KiB
TypeScript
import { Endpoints } from './api.types';
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const MK_API_ERROR = Symbol();
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export type APIError = {
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id: string;
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code: string;
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message: string;
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kind: 'client' | 'server';
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info: Record<string, any>;
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};
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export function isAPIError(reason: any): reason is APIError {
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return reason[MK_API_ERROR] === true;
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}
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export type FetchLike = (input: string, init?: {
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method?: string;
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body?: string;
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credentials?: RequestCredentials;
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cache?: RequestCache;
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}) => Promise<{
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status: number;
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json(): Promise<any>;
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}>;
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type IsNeverType<T> = [T] extends [never] ? true : false;
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type StrictExtract<Union, Cond> = Cond extends Union ? Union : never;
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export class APIClient {
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public origin: string;
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public credential: string | null | undefined;
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public fetch: FetchLike;
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constructor(opts: {
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origin: APIClient['origin'];
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credential?: APIClient['credential'];
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fetch?: APIClient['fetch'] | null | undefined;
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}) {
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this.origin = opts.origin;
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this.credential = opts.credential;
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this.fetch = opts.fetch || fetch;
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}
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public request<E extends keyof Endpoints, P extends Endpoints[E]['req']>(
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endpoint: E, params: P = {} as P, credential?: string | null | undefined,
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): Promise<Endpoints[E]['res'] extends { $switch: { $cases: [any, any][]; $default: any; }; }
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? IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][number], [P, any]>> extends true
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? Endpoints[E]['res']['$switch']['$default']
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: StrictExtract<Endpoints[E]['res']['$switch']['$cases'][number], [P, any]>[1]
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: Endpoints[E]['res']>
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{
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const promise = new Promise((resolve, reject) => {
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this.fetch(`${this.origin}/api/${endpoint}`, {
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method: 'POST',
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body: JSON.stringify({
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...params,
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i: credential !== undefined ? credential : this.credential
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}),
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credentials: 'omit',
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cache: 'no-cache'
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}).then(async (res) => {
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const body = res.status === 204 ? null : await res.json();
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if (res.status === 200) {
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resolve(body);
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} else if (res.status === 204) {
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resolve(null);
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} else {
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reject({
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[MK_API_ERROR]: true,
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...body.error
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});
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}
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}).catch(reject);
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});
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return promise as any;
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}
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}
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