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require('isomorphic-fetch');
export interface Identifyable {
id: any;
}
export interface IFetchConfig {
protocol: string;
ip: string;
port?: number;
api?: string;
}
export interface IFetchBase<T extends Identifyable> {
delete(item: T): Promise<any>;
find(id: any): Promise<T>;
findAll<TResult>(suffix?: string): Promise<TResult[]>;
get(queryParams?: string): Promise<T[]>;
head(item: T): Promise<any>;
post(item: T): Promise<any>;
put(item: T): Promise<any>;
}
export abstract class FetchBase<T extends Identifyable>
implements IFetchBase<T> {
protected endpoint: string = '';
protected requestMode: RequestMode = 'cors';
constructor(private config: IFetchConfig) {}
head(item: T): Promise<any> {
return fetch(this.getUrl(item), this.headOptions())
.then(this.handleHeadFetchResponse)
.catch(this.rejectErrorPromise);
}
findAll<TResult>(suffix?: string): Promise<TResult[]> {
return fetch(`${this.getUrl()}${suffix}`, this.getOptions())
.then(this.handleFetchResponse)
.then((json: any) => this.jsonResponse<TResult[]>(json))
.catch(this.rejectErrorPromise);
}
find(id: any): Promise<T> {
return fetch(this.getUrl(<T>{ id }), this.getOptions())
.then(this.handleFetchResponse)
.then((json: any) => this.jsonResponse<T>(json))
.catch(this.rejectErrorPromise);
}
get(queryParams?: string): Promise<T[]> {
return fetch(this.getUrl(void 0, queryParams), this.getOptions())
.then(this.handleFetchResponse)
.then((json: any) => this.jsonResponse<T[]>(json))
.catch(this.rejectErrorPromise);
}
put(item: T): Promise<any> {
return fetch(this.getUrl(item), this.putOptions(item))
.then(this.handleFetchResponse)
.then((json: any) => this.jsonResponse<any>(json))
.catch(this.rejectErrorPromise);
}
post(item: T): Promise<any> {
return fetch(this.getUrl(item), this.postOptions(item))
.then(this.handleFetchResponse)
.then((json: any) => this.jsonResponse<any>(json))
.catch(this.rejectErrorPromise);
}
delete(item: T): Promise<any> {
return fetch(this.getUrl(item), this.deleteOptions())
.then(this.handleFetchResponse)
.then((json: any) => this.jsonResponse<any>(json))
.catch(this.rejectErrorPromise);
}
getUrl(resource?: T, queryParams?: string): string {
let { protocol, ip, port } = this.config;
if (!protocol) {
protocol = 'http';
}
Eif (!ip) {
ip = 'localhost';
}
let portString = '';
if (port != null && port > 0) {
portString += `:${port}`;
}
let url = `${protocol}://${ip}${portString}`;
url += this.config.api ? `/${this.config.api}` : '';
url += this.endpoint ? `/${this.endpoint}` : '';
let resourceId = '';
if (resource != null && resource.id != null) {
resourceId = resource.id.toString();
}
if (resourceId.length > 0 && resourceId != '0') {
url += `/${resourceId}`;
}
if (queryParams != null && queryParams.length > 0) {
url += queryParams;
}
return url;
}
protected rejectErrorPromise(reason: Error) {
return Promise.reject(reason);
}
protected jsonResponse<TResult>(json) {
return Promise.resolve<TResult>(json);
}
protected handleFetchResponse(response: Response) {
if (!response.ok) {
return Promise.reject(new Error(response.statusText));
}
return response.json();
}
protected handleHeadFetchResponse(response: Response) {
if (!response.ok) {
return Promise.reject(new Error(response.statusText));
}
return Promise.resolve(response.headers);
}
protected headOptions(): RequestInit {
return this.getRequestInit('HEAD');
}
protected getOptions(): RequestInit {
return this.getRequestInit('GET');
}
protected postOptions(item: T): RequestInit {
return this.getRequestInit('POST', JSON.stringify(item));
}
protected putOptions(item: T): RequestInit {
return this.getRequestInit('PUT', JSON.stringify(item));
}
protected deleteOptions(): RequestInit {
return this.getRequestInit('DELETE');
}
protected getRequestInit(method: string, body?: string): RequestInit {
return {
body,
method,
mode: this.requestMode,
headers: {
'Content-Type': 'application/json'
}
};
}
}
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