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const { app } = require("electron");
const path = require("path");
const fs = require("fs");
const { https } = require("follow-redirects");
// all requests results are stored in this file
const cachePath = path.join(app.getPath("cache"), "requests.json");
const NORTHSTAR_LATEST_RELEASE_KEY = "nsLatestRelease";
function _saveCache(data) {
fs.writeFileSync(cachePath, JSON.stringify(data));
}
function _getRequestsCache() {
if (fs.existsSync(cachePath)) {
return JSON.parse(fs.readFileSync(cachePath, "utf8"));
} else {
fs.writeFileSync(cachePath, "{}");
return {};
}
}
// Returns latest Northstar version available from GitHub releases. If
// there's no cache result for this request, or if cache exists but is
// old, refreshes cache with new data.
async function getLatestNsVersion() {
return new Promise((resolve, reject) => {
let cache = _getRequestsCache();
if (cache[NORTHSTAR_LATEST_RELEASE_KEY] && (Date.now() - cache[NORTHSTAR_LATEST_RELEASE_KEY]["time"]) < 5 * 60 * 1000) {
console.log(`returning ${NORTHSTAR_LATEST_RELEASE_KEY} data from cache`);
resolve( cache[NORTHSTAR_LATEST_RELEASE_KEY]["body"]["tag_name"] );
} else {
https.get({
host: "api.github.com",
port: 443,
path: "/repos/R2Northstar/Northstar/releases/latest",
method: "GET",
headers: { "User-Agent": "viper" }
},
response => {
response.setEncoding("utf8");
let responseData = "";
response.on("data", data => {
responseData += data;
});
response.on("end", _ => {
cache[NORTHSTAR_LATEST_RELEASE_KEY] = {
"time": Date.now(),
"body": JSON.parse(responseData)
};
_saveCache(cache);
resolve( cache[NORTHSTAR_LATEST_RELEASE_KEY]["body"]["tag_name"] );
});
});
}
});
}
// Returns the download link to latest Northstar version. Should always
// be called after getLatestNsVersion, as it refreshes cache data (if
// needed).
function getLatestNsVersionLink() {
const cache = _getRequestsCache();
return cache[NORTHSTAR_LATEST_RELEASE_KEY]["body"].assets[0].browser_download_url;
}
module.exports = {
getLatestNsVersion,
getLatestNsVersionLink
};
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