1 files changed, 17 insertions, 0 deletions
diff --git a/api/src/util/ipAddress.ts b/api/src/util/ipAddress.ts
index 0a724daa..c6239426 100644
--- a/api/src/util/ipAddress.ts
+++ b/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
+}
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