From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- dom/base/LocationHelper.sys.mjs | 51 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 dom/base/LocationHelper.sys.mjs (limited to 'dom/base/LocationHelper.sys.mjs') diff --git a/dom/base/LocationHelper.sys.mjs b/dom/base/LocationHelper.sys.mjs new file mode 100644 index 0000000000..671dd414d6 --- /dev/null +++ b/dom/base/LocationHelper.sys.mjs @@ -0,0 +1,51 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +function isPublic(ap) { + let mask = "_nomap"; + let result = ap.ssid.indexOf(mask, ap.ssid.length - mask.length); + return result == -1; +} + +function sort(a, b) { + return b.signal - a.signal; +} + +function encode(ap) { + return { macAddress: ap.mac, signalStrength: ap.signal }; +} + +/** + * Shared utility functions for modules dealing with + * Location Services. + */ + +export class LocationHelper { + static formatWifiAccessPoints(accessPoints) { + return accessPoints.filter(isPublic).sort(sort).map(encode); + } + + /** + * Calculate the distance between 2 points using the Haversine formula. + * https://en.wikipedia.org/wiki/Haversine_formula + */ + static distance(p1, p2) { + let rad = x => (x * Math.PI) / 180; + // Radius of the earth. + let R = 6371e3; + let lat = rad(p2.lat - p1.lat); + let lng = rad(p2.lng - p1.lng); + + let a = + Math.sin(lat / 2) * Math.sin(lat / 2) + + Math.cos(rad(p1.lat)) * + Math.cos(rad(p2.lat)) * + Math.sin(lng / 2) * + Math.sin(lng / 2); + + let c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)); + + return R * c; + } +} -- cgit v1.2.3