102 lines
3.3 KiB
TypeScript
102 lines
3.3 KiB
TypeScript
import type { Endpoints } from './api.types.js';
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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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headers: {[key in string]: string}
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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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type IsCaseMatched<E extends keyof Endpoints, P extends Endpoints[E]['req'], C extends number> =
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IsNeverType<StrictExtract<Endpoints[E]['res']['$switch']['$cases'][C], [P, any]>> extends false ? true : false;
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type GetCaseResult<E extends keyof Endpoints, P extends Endpoints[E]['req'], C extends number> =
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StrictExtract<Endpoints[E]['res']['$switch']['$cases'][C], [P, any]>[1];
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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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// ネイティブ関数をそのまま変数に代入して使おうとするとChromiumではIllegal invocationエラーが発生するため、
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// 環境で実装されているfetchを使う場合は無名関数でラップして使用する
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this.fetch = opts.fetch ?? ((...args) => fetch(...args));
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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][]; $default: any; }; }
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?
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IsCaseMatched<E, P, 0> extends true ? GetCaseResult<E, P, 0> :
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IsCaseMatched<E, P, 1> extends true ? GetCaseResult<E, P, 1> :
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IsCaseMatched<E, P, 2> extends true ? GetCaseResult<E, P, 2> :
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IsCaseMatched<E, P, 3> extends true ? GetCaseResult<E, P, 3> :
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IsCaseMatched<E, P, 4> extends true ? GetCaseResult<E, P, 4> :
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IsCaseMatched<E, P, 5> extends true ? GetCaseResult<E, P, 5> :
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IsCaseMatched<E, P, 6> extends true ? GetCaseResult<E, P, 6> :
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IsCaseMatched<E, P, 7> extends true ? GetCaseResult<E, P, 7> :
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IsCaseMatched<E, P, 8> extends true ? GetCaseResult<E, P, 8> :
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IsCaseMatched<E, P, 9> extends true ? GetCaseResult<E, P, 9> :
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Endpoints[E]['res']['$switch']['$default']
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: Endpoints[E]['res']> {
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const promise = new Promise((resolve, reject) => {
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this.fetch(`${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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headers: {
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'Content-Type': 'application/json',
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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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