minecraft-java-manager/src/web.js

const config = require("./config")

async function getVersionManifest(version) {
    const mainifestRequest = await fetch(config.launcherManifest.get())
    const manifest = await mainifestRequest.json()
    const component = manifest.versions.find($version => $version.id == version)
    if (!typeof component == "object") {
        throw new Error("Unknown version")
    }
    return component.url
}

async function getRequiredJREFor(versionUrl) {
    const mainifestRequest = await fetch(versionUrl)
    const manifest = await mainifestRequest.json()
    return manifest.javaVersion
}

async function getJREComponentDetails(componentRequested, os) {
    const mainifestRequest = await fetch(config.allRuntimes.get())
    const manifest = await mainifestRequest.json()
    const component = manifest[os][componentRequested]
    if (typeof component != "object") {
        throw new Error("No JRE Component found")
    }
    return component
}

async function getJREComponentManifest(url) {
    const mainifestRequest = await fetch(url)
    const manifest = await mainifestRequest.json()
    return manifest
}

module.exports = {
    getVersionManifest,
    getRequiredJREFor,
    getJREComponentDetails,
    getJREComponentManifest
}