Implemented voice apis #127 and #78

api/src/util/Voice.ts

@@ -0,0 +1,32 @@
+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
+    }))
+}

api/src/util/ipAddress.ts

@@ -60,6 +60,7 @@ const exampleData = {
 	status: 200
 };
 
+//TODO add function that support both ip and domain names
 export async function IPAnalysis(ip: string): Promise<typeof exampleData> {
 	const { ipdataApiKey } = Config.get().security;
 	if (!ipdataApiKey) return { ...exampleData, ip };
@@ -79,3 +80,19 @@ export function getIpAdress(req: Request): string {
 	// @ts-ignore
 	return req.headers[Config.get().security.forwadedFor] || req.socket.remoteAddress;
 }
+
+
+export function distanceBetweenLocations(loc1: any, loc2: any): number {
+	return distanceBetweenCoords(loc1.latitude, loc1.longitude, loc2.latitude, loc2.longitude);
+}
+
+//Haversine function
+function distanceBetweenCoords(lat1: number, lon1: number, lat2: number, lon2: number) {
+	const p = 0.017453292519943295;    // Math.PI / 180
+	const c = Math.cos;
+	const a = 0.5 - c((lat2 - lat1) * p) / 2 +
+		c(lat1 * p) * c(lat2 * p) *
+		(1 - c((lon2 - lon1) * p)) / 2;
+
+	return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km
+}