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import { Endpoints } from './api.types';
const MK_API_ERROR = Symbol();
export type APIError = {
id: string;
code: string;
message: string;
kind: 'client' | 'server';
info: Record<string, any>;
};
export function isAPIError(reason: any): reason is APIError {
return reason[MK_API_ERROR] === true;
}
export type FetchLike = (input: string, init?: {
method?: string;
body?: string;
credentials?: RequestCredentials;
cache?: RequestCache;
}) => Promise<{
status: number;
json(): Promise<any>;
}>;
type IsNeverType<T> = [T] extends [never] ? true : false;
type StrictExtract<Union, Cond> = Cond extends Union ? Union : never;
export class APIClient {
public origin: string;
public credential: string | null | undefined;
public fetch: FetchLike;
constructor(opts: {
origin: APIClient['origin'];
credential?: APIClient['credential'];
fetch?: APIClient['fetch'] | null | undefined;
}) {
this.origin = opts.origin;
this.credential = opts.credential;
this.fetch = opts.fetch || fetch;
}
public request<E extends keyof Endpoints, P extends Endpoints[E]['req']>(
endpoint: E, params: P = {} as P, credential?: string | null | undefined,
): Promise<Endpoints[E]['res'] extends { $switch: { $cases: [any, any][]; $default: any; }; }
? IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][0], [P, any]>> extends false
? StrictExtract<Endpoints[E]['res']['$switch']['$cases'][0], [P, any]>[1]
: IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][1], [P, any]>> extends false
? StrictExtract<Endpoints[E]['res']['$switch']['$cases'][1], [P, any]>[1]
: IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][2], [P, any]>> extends false
? StrictExtract<Endpoints[E]['res']['$switch']['$cases'][2], [P, any]>[1]
: IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][3], [P, any]>> extends false
? StrictExtract<Endpoints[E]['res']['$switch']['$cases'][3], [P, any]>[1]
: IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][4], [P, any]>> extends false
? StrictExtract<Endpoints[E]['res']['$switch']['$cases'][4], [P, any]>[1]
: Endpoints[E]['res']['$switch']['$default']
: Endpoints[E]['res']>
{
const promise = new Promise((resolve, reject) => {
this.fetch(`${this.origin}/api/${endpoint}`, {
method: 'POST',
body: JSON.stringify({
...params,
i: credential !== undefined ? credential : this.credential
}),
credentials: 'omit',
cache: 'no-cache'
}).then(async (res) => {
const body = res.status === 204 ? null : await res.json();
if (res.status === 200) {
resolve(body);
} else if (res.status === 204) {
resolve(null);
} else {
reject({
[MK_API_ERROR]: true,
...body.error
});
}
}).catch(reject);
});
return promise as any;
}
}
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