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339 lines
8.5 KiB
339 lines
8.5 KiB
const routes = require('express').Router();
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const got = require("got");
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const cache = require('memory-cache');
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const dotenv = require("dotenv").config();
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const GITHUB_API = "https://api.github.com";
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const authenticate = `client_id=${process.env.CLIENT_ID}&client_secret=${process.env.CLIENT_SECRET}`;
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const API_FOLLOWING = "/following";
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const API_FOLLOWERS = "/followers";
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const API_USER_PATH = "/users/";
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const API_ORGS_PATH = "/orgs/";
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const API_PAGINATION_SIZE = 100; // 100 is the max, 30 is the default
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// if this is too large, it would be infeasible to make graphs for people following popular people
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const API_MAX_PAGES = 2;
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const API_PAGINATION = "&per_page=" + API_PAGINATION_SIZE;
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const REPOS_PATH = "/repos";
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/**
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* Queries data from the github APi server and returns it as
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* a json object in a promise.
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*
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* This makes no attempt to cache
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*
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* @param {*} requestURL endpoint on githubapi: ex: /users/jrtechs/following
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*/
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const queryGithubAPIRaw = async requestURL => {
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let queryURL = requestURL.includes("?page=")
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? `${GITHUB_API}${requestURL}&${authenticate}`
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:`${GITHUB_API}${requestURL}?${authenticate}`;
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console.log(queryURL);
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try {
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const req = await got(queryURL, { json: true });
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cache.put(requestURL, req);
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return req;
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} catch (error) {
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console.log(error);
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cache.put(requestURL, `${error.statusCode} - ${error.statusMessage}`);
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}
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}
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/**
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* Queries data from the github api server
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* and caches the results locally.
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*
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* @param {*} requestURL
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*/
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const queryGitHubAPI = async requestURL => {
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const apiData = cache.get(requestURL);
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if (apiData) {
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console.log("Fetched From Cache");
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return apiData
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}
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try {
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return await queryGithubAPIRaw(requestURL);
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} catch (error) {
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console.log(error);
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}
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}
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/**
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* Fetches all content from a particular github api endpoint
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* using their pagination schema.
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*
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* @param {*} username username of github client
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* @param {*} apiPath following or followers
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* @param {*} page current pagination page
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* @param {*} lst list we are building on
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*/
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const fetchAllWithPagination = async (apiPath, page, lst) => {
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try {
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const req = await queryGithubAPIRaw(`${apiPath}?page=${page}${API_PAGINATION}`);
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if (req.body.hasOwnProperty("length")) {
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const list = lst.concat(req.body);
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if(page < API_MAX_PAGES && req.length === API_PAGINATION_SIZE) {
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const redo = await fetchAllWithPagination(apiPath, page + 1, list);
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return redo;
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}
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return list;
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}
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} catch (error) {
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console.log("Error with api request");
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}
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}
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/**
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* Makes a copy of a JS object with certain properties
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*
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* @param {*} props
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* @param {*} obj
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*/
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function copyWithProperties(props, obj)
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{
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var newO = new Object();
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for(var i =0; i < props.length; i++)
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{
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newO[props[i]] = obj[props[i]];
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}
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return newO;
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}
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/**
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* Combines the list of friends and followers ignoring duplicates
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* that are already in the list. (person is both following and followed by someone)
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*
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* This also removes any unused properties like events_url and organizations_url
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*
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* @param {*} followingAndFollowers
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*/
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const minimizeFriends = people => {
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let friendLst = [];
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let ids = new Set();
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people.forEach(person => {
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if(!ids.has(person.id)) {
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ids.add(person.id);
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friendLst.push({
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login: person.login,
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avatar_url: person.avatar_url
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});
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}
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});
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return friendLst;
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}
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/**
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* Fetches all the people that are either following or is followed
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* by a person on github. This will cache the results to make simultaneous
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* connections easier and less demanding on the github API.
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*
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* @param {*} user
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*/
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const queryFriends = async user => {
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const cacheHit = cache.get("/friends/" + user);
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if (cacheHit){
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console.log("Friends cache hit");
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return cacheHit;
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}
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try {
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const followers = await fetchAllWithPagination(API_USER_PATH + user + API_FOLLOWERS, 1, []);
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const following = await fetchAllWithPagination(API_USER_PATH + user + API_FOLLOWING, 1, []);
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const fList = minimizeFriends(following.concat(followers));
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cache.put(`/friends/${user}`, fList);
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return fList;
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} catch (error) {
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console.log("API Error", err);
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}
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}
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/**
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*
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* Fetches all of the members of an organization from the
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* API or cache
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*
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* /orgs/RITlug/members?page=1
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*
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* @param {*} orgName
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*/
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const getOrganizationMembers = async orgName => {
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const cacheHit = cache.get("/org/users/" + orgName);
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if (cacheHit){
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console.log("Org members cache hit");
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return cacheHit;
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}
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try {
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const members = await fetchAllWithPagination(API_ORGS_PATH + orgName + "/members", 1, []);
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const membersMin = minimizeFriends(members);
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cache.put("/org/users/" + orgName, membersMin);
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return membersMin;
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} catch (error) {
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console.log(error);
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}
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}
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/**
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* Minimizes the JSON for a list of repositories
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*
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* @param {*} repositories
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*/
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function minimizeRepositories(repositories)
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{
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var rList = [];
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for(var i = 0; i < repositories.length; i++)
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{
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rList.push(copyWithProperties(["name", "created_at", "homepage",
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"description", "language", "forks", "watchers",
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"open_issues_count", "license", "html_url"],
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repositories[i]));
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}
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return rList;
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}
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/**
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* Fetches all repositories from the API
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*
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* @param {*} user name of org/user
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* @param {*} orgsOrUsers either /users/ or /orgs/
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*/
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function queryRepositories(user, orgsOrUsers)
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{
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const cacheHit = cache.get(user + REPOS_PATH);
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return new Promise((resolve, reject)=>
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{
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if(cacheHit == null)
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{
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fetchAllWithPagination(orgsOrUsers + user + REPOS_PATH, 1, []).then((repos)=>
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{
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var minimized = minimizeRepositories(repos);
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resolve(minimized);
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cache.put(user + REPOS_PATH, minimized);
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}).catch((err)=>
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{
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console.log(err)
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console.log("bad things went down");
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})
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}
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else
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{
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console.log("Repositories cache hit");
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resolve(cacheHit);
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}
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});
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}
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/**
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* /users/name/following/followers
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*/
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routes.get("/friends/:name", async (req, res)=> {
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try {
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const query = await queryFriends(req.params.name);
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res.json(query);
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} catch (error) {
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res.status(500).json({error: 'API error fetching friends'});
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}
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});
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routes.get("/org/users/:name", async (request, res) => {
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try {
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const orgMembers = await getOrganizationMembers(request.params.name);
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res.json(orgMembers).end();
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} catch (error) {
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res
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.status(500)
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.json({error: 'API error fetching friends'})
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.end();
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}
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});
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routes.get("/repositories/:name", (request, result)=>
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{
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queryRepositories(request.params.name, API_USER_PATH).then(repos=>
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{
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result.json(repos)
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.end();
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}).catch(error=>
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{
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result.status(500)
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.json({error: 'API error fetching friends'})
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.end();
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});
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});
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routes.get("/org/repositories/:name", (request, result)=>
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{
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queryRepositories(request.params.name, API_ORGS_PATH).then(repos=>
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{
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result.json(repos)
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.end();
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}).catch(error=>
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{
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result.status(500)
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.json({error: 'API error fetching friends'})
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.end();
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});
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});
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routes.get('/*', (request, result) =>
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{
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var gitHubAPIURL = request.url;
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result.setHeader('Content-Type', 'application/json');
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queryGitHubAPI(gitHubAPIURL).then((data)=>
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{
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if(data.hasOwnProperty("id") || data[0].hasOwnProperty("id"))
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{
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result.write(JSON.stringify(data));
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}
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else
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{
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result.write("[]");
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}
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result.end();
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}).catch((error)=>
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{
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try
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{
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if(error.hasOwnProperty("id") || error[0].hasOwnProperty("id"))
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{
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result.write(JSON.stringify(error));
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}
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else
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{
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result.write("[]");
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}
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}
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catch(error)
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{
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result.write("[]");
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};
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result.end();
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});
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if(cache.size() > 50000)
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{
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cache.clear();
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}
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});
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module.exports = routes;
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