111 lines
3.2 KiB
TypeScript
111 lines
3.2 KiB
TypeScript
// Imports
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import {IncomingMessage} from 'http';
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import * as https from 'https';
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import {assertNotMissingOrEmpty} from './utils';
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// Constants
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const GITHUB_HOSTNAME = 'api.github.com';
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// Interfaces - Types
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interface RequestParams {
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[key: string]: string | number;
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}
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type RequestParamsOrNull = RequestParams | null;
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// Classes
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export class GithubApi {
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protected requestHeaders: {[key: string]: string};
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// Constructor
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constructor(githubToken: string) {
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assertNotMissingOrEmpty('githubToken', githubToken);
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this.requestHeaders = {
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'Authorization': `token ${githubToken}`,
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'User-Agent': `Node/${process.versions.node}`,
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};
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}
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// Methods - Public
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public get<T>(pathname: string, params?: RequestParamsOrNull): Promise<T> {
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const path = this.buildPath(pathname, params);
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return this.request<T>('get', path);
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}
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public post<T>(pathname: string, params?: RequestParamsOrNull, data?: any): Promise<T> {
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const path = this.buildPath(pathname, params);
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return this.request<T>('post', path, data);
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}
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// Methods - Protected
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protected buildPath(pathname: string, params?: RequestParamsOrNull): string {
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if (params == null) {
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return pathname;
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}
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const search = (params === null) ? '' : this.serializeSearchParams(params);
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const joiner = search && '?';
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return `${pathname}${joiner}${search}`;
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}
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protected getPaginated<T>(pathname: string, baseParams: RequestParams = {}, currentPage: number = 0): Promise<T[]> {
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const perPage = 100;
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const params = {
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...baseParams,
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page: currentPage,
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per_page: perPage,
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};
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return this.get<T[]>(pathname, params).then(items => {
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if (items.length < perPage) {
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return items;
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}
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return this.getPaginated<T>(pathname, baseParams, currentPage + 1).then(moreItems => [...items, ...moreItems]);
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});
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}
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protected request<T>(method: string, path: string, data: any = null): Promise<T> {
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return new Promise<T>((resolve, reject) => {
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const options = {
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headers: {...this.requestHeaders},
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host: GITHUB_HOSTNAME,
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method,
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path,
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};
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const onError = (statusCode: number, responseText: string) => {
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const url = `https://${GITHUB_HOSTNAME}${path}`;
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reject(`Request to '${url}' failed (status: ${statusCode}): ${responseText}`);
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};
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const onSuccess = (responseText: string) => {
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try { resolve(JSON.parse(responseText)); } catch (err) { reject(err); }
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};
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const onResponse = (res: IncomingMessage) => {
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const statusCode = res.statusCode || -1;
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const isSuccess = (200 <= statusCode) && (statusCode < 400);
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let responseText = '';
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res.
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on('data', d => responseText += d).
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on('end', () => isSuccess ? onSuccess(responseText) : onError(statusCode, responseText)).
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on('error', reject);
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};
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https.
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request(options, onResponse).
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on('error', reject).
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end(data && JSON.stringify(data));
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});
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}
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protected serializeSearchParams(params: RequestParams): string {
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return Object.keys(params).
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filter(key => params[key] != null).
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map(key => `${key}=${encodeURIComponent(String(params[key]))}`).
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join('&');
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}
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}
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