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server.js
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server.js
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"use strict";
const express = require("express");
const path = require("path");
const cors = require("cors");
const requestExt = require("request-extensible");
const RequestHttpCache = require("request-http-cache");
const timeAgo = require("node-time-ago");
const marked = require("marked");
marked.setOptions({
renderer: new marked.Renderer(),
gfm: true,
tables: true,
breaks: false,
pedantic: false,
sanitize: false,
smartLists: true,
smartypants: false,
});
// Constants
const PORT = process.env.PORT || 8080;
const CLIENT_ID = process.env.GITHUB_CLIENTID || "";
const CLIENT_SECRET = process.env.GITHUB_SECRET || "";
const HOST = "https://api.github.com/";
const OWNER = "altany";
const AUTHORISATION = Buffer.from(`${CLIENT_ID}:${CLIENT_SECRET}`).toString(
"base64"
);
const API_VERSION = "v3";
const httpRequestCache = new RequestHttpCache({
max: 10 * 1024 * 1024, // Maximum cache size (1mb) defaults to 512Kb
ttl: 7200,
});
const request = requestExt({
extensions: [httpRequestCache.extension],
});
let options = {
headers: {
"User-Agent": OWNER,
Authorization: `Basic ${AUTHORISATION}`,
Accept: `application/vnd.github.${API_VERSION}.raw+json`,
},
};
const formatErrorResponse = ({
response,
message = "",
repo,
code = 500,
contentType = "text/plain",
} = {}) => {
response.statusCode = code;
response.setHeader("Content-Type", contentType);
return response.end(message + (repo ? ' for repo "' + repo + '"' : ""));
};
const sumObjectsByKeys = (...objects) =>
objects.reduce((object1, object2) => {
for (let property in object2) {
if (object2.hasOwnProperty(property))
object1[property] = (object1[property] || 0) + object2[property];
}
return object1;
}, {});
Object.prototype.hasOwnPropertyCaseInsensitive = function (value) {
for (var prop in this) {
if (prop.toLowerCase() === value.toLowerCase()) {
return true;
}
}
return false;
};
const getRepos = (res) => {
console.log("Getting all repos");
return new Promise((resolve, reject) => {
options.url = `${HOST}users/${OWNER}/repos?sort=created`;
request(options, (error, response, body) => {
if (error) {
reject(formatErrorResponse({ response: res, message: error }));
} else if (response.statusCode !== 200) {
reject(
formatErrorResponse({
response: res,
message: response.body,
code: response.statusCode,
contentType: "application/javascript",
})
);
}
resolve(body);
});
});
};
const getRepoLanguages = (repo, res) => {
console.log(`Getting languages for repo ${repo}`);
return new Promise((resolve, reject) => {
options.url = `${HOST}repos/${OWNER}/${repo}/languages`;
request(options, (error, response, body) => {
if (error) {
reject(
formatErrorResponse({
response: res,
message: error,
repo: repo,
})
);
}
if (response.statusCode === 404) {
reject(
formatErrorResponse({
response: res,
message: "languages not found",
repo: repo,
code: 404,
})
);
} else if (response.statusCode !== 200) {
reject(
formatErrorResponse({
response: res,
message: response.body,
repo: repo,
code: response.statusCode,
contentType: "text/html",
})
);
} else {
resolve(body);
}
});
});
};
// App
const app = express();
app.use(cors());
app.get("/", (req, res) => {
res.sendFile(path.join(__dirname + "/welcome.html"));
});
app.get("/repos", (req, res) => {
getRepos(res)
.then((response) => {
res.setHeader("Content-Type", "application/json");
res.send(response);
})
.catch((error) => error);
});
app.get("/readme/:repo", (req, res) => {
options.url = `${HOST}repos/${OWNER}/${req.params.repo}/contents/README.md`;
request(options, (error, response, body) => {
if (error) {
return formatErrorResponse({
response: res,
message: error,
repo: req.params.repo,
});
}
if (response.statusCode === 404) {
return formatErrorResponse({
response: res,
message: "README.md not found",
repo: req.params.repo,
code: 404,
});
} else if (response.statusCode !== 200) {
return formatErrorResponse({
response: res,
message: response.body,
repo: req.params.repo,
code: response.statusCode,
contentType: "text/html",
});
} else {
res.setHeader("Content-Type", "text/html");
res.end(marked(body).toString());
}
});
});
app.get("/last-commit/:repo", (req, res) => {
options.url = `${HOST}repos/${OWNER}/${req.params.repo}/commits`;
request(options, (error, response, body) => {
if (error) {
return formatErrorResponse({
response: res,
message: error,
repo: req.params.repo,
});
}
let result = {};
if (response.statusCode === 404) {
return formatErrorResponse({
response: res,
message: "Commit history not found",
repo: req.params.repo,
code: 404,
});
} else if (response.statusCode !== 200) {
return formatErrorResponse({
response: res,
message: response.body,
repo: req.params.repo,
code: response.statusCode,
contentType: "text/html",
});
} else {
let commit = JSON.parse(body)[0];
result = {
link: commit.html_url,
date: timeAgo(commit.commit.author.date),
message: commit.commit.message,
};
}
res.setHeader("Content-Type", "application/json");
res.end(JSON.stringify(result));
});
});
app.get("/languages/:repo", (req, res) => {
getRepoLanguages(req.params.repo, res)
.then((response) => {
res.setHeader("Content-Type", "application/json");
res.send(response);
})
.catch((error) => error);
});
app.get("/languages", (req, res) => {
return getRepos(res)
.then((repos) => {
return Promise.all(
JSON.parse(repos).map((repo) => getRepoLanguages(repo.name, res))
)
.then((languageSets) => {
const languageObjects = languageSets.map((set) => JSON.parse(set));
const languageData = sumObjectsByKeys(...languageObjects);
const responseData = Object.entries(languageData).map(
([key, value]) => ({
language: key,
value,
})
);
res.setHeader("Content-Type", "application/json");
res.send(responseData);
})
.catch((error) => error);
})
.catch((error) => error);
});
app.get("/repos/language/:language", (req, res) => {
return getRepos(res)
.then((repos) => {
return Promise.all(
JSON.parse(repos).map(async (repo) => ({
repo: repo.name,
languages: JSON.parse(await getRepoLanguages(repo.name, res)),
}))
)
.then((repoLanguages) => {
const repos = repoLanguages
.filter((element) => {
return element.languages.hasOwnPropertyCaseInsensitive(
req.params.language
);
})
.map((element) => element.repo);
res.send(repos);
})
.catch((error) => error);
})
.catch((error) => error);
});
app.use((req, res, next) => {
let err = new Error("Not Found");
err.status = 404;
next(err);
});
app.use((err, req, res, next) => {
res.sendStatus(err.status || 500);
});
app.listen(PORT);
console.log("Running on http://localhost:" + PORT);