server/api/src/util/Voice.ts

import {Config} from "@fosscord/util";
import {distanceBetweenLocations, IPAnalysis} from "./ipAddress";

export async function getVoiceRegions(ipAddress: string, vip: boolean) {
    const regions = Config.get().regions;
    const availableRegions = regions.available.filter(ar => vip ? true : !ar.vip);
    let optimalId = regions.default

    if(!regions.useDefaultAsOptimal) {
        const clientIpAnalysis = await IPAnalysis(ipAddress)

        let min = Number.POSITIVE_INFINITY

        for (let ar of availableRegions) {
            //TODO the endpoint location should be saved in the database if not already present to prevent IPAnalysis call
            const dist = distanceBetweenLocations(clientIpAnalysis, ar.location || (await IPAnalysis(ar.endpoint)))

            if(dist < min) {
                min = dist
                optimalId = ar.id
            }
        }
    }

    return availableRegions.map(ar => ({
        id: ar.id,
        name: ar.name,
        custom: ar.custom,
        deprecated: ar.deprecated,
        optimal: ar.id === optimalId
    }))
}