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https://github.com/spacebarchat/server.git
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Rory&
57 lines
1.6 KiB
TypeScript
57 lines
1.6 KiB
TypeScript
/*
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Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
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Copyright (C) 2023 Spacebar and Spacebar Contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import { Config } from "@spacebar/util";
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import { Request } from "express";
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export function getIpAdress(req: Request): string {
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// TODO: express can do this (trustProxies: true)?
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return req.ip!;
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}
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type Location = { latitude: number; longitude: number };
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export function distanceBetweenLocations(
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loc1: Location,
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loc2: Location,
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): number {
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return distanceBetweenCoords(
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loc1.latitude,
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loc1.longitude,
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loc2.latitude,
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loc2.longitude,
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);
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}
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//Haversine function
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function distanceBetweenCoords(
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lat1: number,
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lon1: number,
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lat2: number,
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lon2: number,
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) {
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const p = 0.017453292519943295; // Math.PI / 180
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const c = Math.cos;
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const a =
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0.5 -
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c((lat2 - lat1) * p) / 2 +
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(c(lat1 * p) * c(lat2 * p) * (1 - c((lon2 - lon1) * p))) / 2;
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return 12742 * Math.asin(Math.sqrt(a)); // 2 * R; R = 6371 km
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}
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