/**

* @license

* Copyright Google LLC All Rights Reserved.

*

* Use of this source code is governed by an MIT-style license that can be

* found in the LICENSE file at https://angular.dev/license

*/

import {get} from 'node:https';

import {posix} from 'node:path';

const GITHUB_API = 'https://api.github.com/repos/';

export class GithubClient {

#token;

#ua;

#api;

constructor(repo, token, ua) {

this.#token = token;

this.#ua = ua;

this.#api = posix.join(GITHUB_API, repo);

}

/**

* Get the affected files.

*

* @param {string} baseSha

* @param {string} headSha

* @returns Promise<string[]>

*/

async getAffectedFiles(baseSha, headSha) {

const {files} = JSON.parse(await this.#httpGet(`${this.#api}/compare/${baseSha}...${headSha}`));

return files.map((f) => f.filename);

}

/**

* Get SHA of a branch.

*

* @param {string} branch

* @returns Promise<string>

*/

async getShaForBranch(branch) {

const sha = await this.#httpGet(`${this.#api}/commits/${branch}`, {

headers: {Accept: 'application/vnd.github.VERSION.sha'},

});

if (!sha) {

throw new Error(`Unable to extract the SHA for '${branch}'.`);

}

return sha;

}

#httpGet(url, options = {}) {

options.headers ??= {};

options.headers['Authorization'] = `token ${this.#token}`;

// User agent is required

// https://docs.github.com/en/rest/overview/resources-in-the-rest-api?apiVersion=2022-11-28#user-agent-required

options.headers['User-Agent'] = this.#ua;

return new Promise((resolve, reject) => {

get(url, options, (res) => {

let data = '';

res

.on('data', (chunk) => {

data += chunk;

})

.on('end', () => {

resolve(data);

});

}).on('error', (e) => {

reject(e);

});

});

}

}