mirror of https://github.com/gchq/CyberChef.git
669 lines
23 KiB
JavaScript
669 lines
23 KiB
JavaScript
/**
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* Co-ordinate conversion resources.
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*
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* @author j433866 [j433866@gmail.com]
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* @copyright Crown Copyright 2019
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* @license Apache-2.0
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*/
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import OperationError from "../errors/OperationError.mjs";
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import geohash from "ngeohash";
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/*
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Currently unable to update to geodesy v2 as we cannot load .js modules into a .mjs file.
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When we do update, imports will look like this:
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import LatLonEllipsoidal from "geodesy/latlon-ellipsoidal.js";
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import Mgrs from "geodesy/mgrs.js";
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import OsGridRef from "geodesy/osgridref.js";
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import Utm from "geodesy/utm.js";
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*/
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import geodesy from "geodesy";
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const LatLonEllipsoidal = geodesy.LatLonEllipsoidal,
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Mgrs = geodesy.Mgrs,
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OsGridRef = geodesy.OsGridRef,
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Utm = geodesy.Utm;
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/**
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* Co-ordinate formats
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*/
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export const FORMATS = [
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"Degrees Minutes Seconds",
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"Degrees Decimal Minutes",
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"Decimal Degrees",
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"Geohash",
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"Military Grid Reference System",
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"Ordnance Survey National Grid",
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"Universal Transverse Mercator"
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];
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/**
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* Formats that should be passed to the conversion module as-is
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*/
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const NO_CHANGE = [
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"Geohash",
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"Military Grid Reference System",
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"Ordnance Survey National Grid",
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"Universal Transverse Mercator",
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];
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/**
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* Convert a given latitude and longitude into a different format.
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*
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* @param {string} input - Input string to be converted
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* @param {string} inFormat - Format of the input coordinates
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* @param {string} inDelim - The delimiter splitting the lat/long of the input
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* @param {string} outFormat - Format to convert to
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* @param {string} outDelim - The delimiter to separate the output with
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* @param {string} includeDir - Whether or not to include the compass direction in the output
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* @param {number} precision - Precision of the result
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* @returns {string} A formatted string of the converted co-ordinates
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*/
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export function convertCoordinates (input, inFormat, inDelim, outFormat, outDelim, includeDir, precision) {
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let isPair = false,
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split,
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latlon,
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convLat,
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convLon,
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conv,
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hash,
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utm,
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mgrs,
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osng,
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splitLat,
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splitLong,
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lat,
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lon;
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// Can't have a precision less than 0!
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if (precision < 0) {
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precision = 0;
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}
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if (inDelim === "Auto") {
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// Try to detect a delimiter in the input.
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inDelim = findDelim(input);
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if (inDelim === null) {
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throw new OperationError("Unable to detect the input delimiter automatically.");
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}
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} else if (!inDelim.includes("Direction")) {
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// Convert the delimiter argument value to the actual character
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inDelim = realDelim(inDelim);
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}
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if (inFormat === "Auto") {
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// Try to detect the format of the input data
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inFormat = findFormat(input, inDelim);
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if (inFormat === null) {
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throw new OperationError("Unable to detect the input format automatically.");
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}
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}
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// Convert the output delimiter argument to the real character
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outDelim = realDelim(outDelim);
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if (!NO_CHANGE.includes(inFormat)) {
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if (inDelim.includes("Direction")) {
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// Split on directions
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split = input.split(/[NnEeSsWw]/g);
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if (split[0] === "") {
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// Remove first element if direction preceding
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split = split.slice(1);
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}
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} else {
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split = input.split(inDelim);
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}
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// Replace any co-ordinate symbols with spaces so we can split on them later
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for (let i = 0; i < split.length; i++) {
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split[i] = split[i].replace(/[°˝´'"]/g, " ");
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}
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if (split.length > 1) {
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isPair = true;
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}
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} else {
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// Remove any delimiters from the input
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input = input.replace(inDelim, "");
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isPair = true;
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}
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// Conversions from the input format into a geodesy latlon object
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switch (inFormat) {
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case "Geohash":
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hash = geohash.decode(input.replace(/[^A-Za-z0-9]/g, ""));
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latlon = new LatLonEllipsoidal(hash.latitude, hash.longitude);
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break;
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case "Military Grid Reference System":
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utm = Mgrs.parse(input.replace(/[^A-Za-z0-9]/g, "")).toUtm();
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latlon = utm.toLatLonE();
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break;
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case "Ordnance Survey National Grid":
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osng = OsGridRef.parse(input.replace(/[^A-Za-z0-9]/g, ""));
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latlon = OsGridRef.osGridToLatLon(osng);
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break;
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case "Universal Transverse Mercator":
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// Geodesy needs a space between the first 2 digits and the next letter
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if (/^[\d]{2}[A-Za-z]/.test(input)) {
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input = input.slice(0, 2) + " " + input.slice(2);
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}
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utm = Utm.parse(input);
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latlon = utm.toLatLonE();
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break;
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case "Degrees Minutes Seconds":
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if (isPair) {
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// Split up the lat/long into degrees / minutes / seconds values
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splitLat = splitInput(split[0]);
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splitLong = splitInput(split[1]);
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if (splitLat.length >= 3 && splitLong.length >= 3) {
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lat = convDMSToDD(splitLat[0], splitLat[1], splitLat[2], 10);
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lon = convDMSToDD(splitLong[0], splitLong[1], splitLong[2], 10);
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latlon = new LatLonEllipsoidal(lat.degrees, lon.degrees);
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} else {
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throw new OperationError("Invalid co-ordinate format for Degrees Minutes Seconds");
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}
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} else {
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// Not a pair, so only try to convert one set of co-ordinates
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splitLat = splitInput(split[0]);
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if (splitLat.length >= 3) {
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lat = convDMSToDD(splitLat[0], splitLat[1], splitLat[2]);
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latlon = new LatLonEllipsoidal(lat.degrees, lat.degrees);
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} else {
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throw new OperationError("Invalid co-ordinate format for Degrees Minutes Seconds");
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}
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}
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break;
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case "Degrees Decimal Minutes":
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if (isPair) {
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splitLat = splitInput(split[0]);
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splitLong = splitInput(split[1]);
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if (splitLat.length !== 2 || splitLong.length !== 2) {
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throw new OperationError("Invalid co-ordinate format for Degrees Decimal Minutes.");
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}
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// Convert to decimal degrees, and then convert to a geodesy object
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lat = convDDMToDD(splitLat[0], splitLat[1], 10);
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lon = convDDMToDD(splitLong[0], splitLong[1], 10);
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latlon = new LatLonEllipsoidal(lat.degrees, lon.degrees);
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} else {
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// Not a pair, so only try to convert one set of co-ordinates
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splitLat = splitInput(input);
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if (splitLat.length !== 2) {
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throw new OperationError("Invalid co-ordinate format for Degrees Decimal Minutes.");
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}
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lat = convDDMToDD(splitLat[0], splitLat[1], 10);
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latlon = new LatLonEllipsoidal(lat.degrees, lat.degrees);
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}
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break;
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case "Decimal Degrees":
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if (isPair) {
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splitLat = splitInput(split[0]);
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splitLong = splitInput(split[1]);
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if (splitLat.length !== 1 || splitLong.length !== 1) {
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throw new OperationError("Invalid co-ordinate format for Decimal Degrees.");
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}
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latlon = new LatLonEllipsoidal(splitLat[0], splitLong[0]);
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} else {
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// Not a pair, so only try to convert one set of co-ordinates
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splitLat = splitInput(split[0]);
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if (splitLat.length !== 1) {
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throw new OperationError("Invalid co-ordinate format for Decimal Degrees.");
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}
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latlon = new LatLonEllipsoidal(splitLat[0], splitLat[0]);
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}
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break;
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default:
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throw new OperationError(`Unknown input format '${inFormat}'`);
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}
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// Everything is now a geodesy latlon object
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// These store the latitude and longitude as decimal
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if (inFormat.includes("Degrees")) {
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// If the input string contains directions, we need to check if they're S or W.
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// If either of the directions are, we should make the decimal value negative
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const dirs = input.toUpperCase().match(/[NESW]/g);
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if (dirs && dirs.length >= 1) {
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// Make positive lat/lon values with S/W directions into negative values
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if (dirs[0] === "S" || dirs[0] === "W" && latlon.lat > 0) {
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latlon.lat = -latlon.lat;
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}
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if (dirs.length >= 2) {
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if (dirs[1] === "S" || dirs[1] === "W" && latlon.lon > 0) {
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latlon.lon = -latlon.lon;
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}
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}
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}
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}
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// Try to find the compass directions of the lat and long
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const [latDir, longDir] = findDirs(latlon.lat + "," + latlon.lon, ",");
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// Output conversions for each output format
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switch (outFormat) {
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case "Decimal Degrees":
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// We could use the built in latlon.toString(),
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// but this makes adjusting the output harder
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lat = convDDToDD(latlon.lat, precision);
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lon = convDDToDD(latlon.lon, precision);
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convLat = lat.string;
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convLon = lon.string;
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break;
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case "Degrees Decimal Minutes":
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lat = convDDToDDM(latlon.lat, precision);
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lon = convDDToDDM(latlon.lon, precision);
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convLat = lat.string;
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convLon = lon.string;
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break;
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case "Degrees Minutes Seconds":
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lat = convDDToDMS(latlon.lat, precision);
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lon = convDDToDMS(latlon.lon, precision);
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convLat = lat.string;
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convLon = lon.string;
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break;
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case "Geohash":
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convLat = geohash.encode(latlon.lat, latlon.lon, precision);
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break;
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case "Military Grid Reference System":
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utm = latlon.toUtm();
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mgrs = utm.toMgrs();
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// MGRS wants a precision that's an even number between 2 and 10
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if (precision % 2 !== 0) {
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precision = precision + 1;
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}
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if (precision > 10) {
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precision = 10;
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}
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convLat = mgrs.toString(precision);
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break;
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case "Ordnance Survey National Grid":
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osng = OsGridRef.latLonToOsGrid(latlon);
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if (osng.toString() === "") {
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throw new OperationError("Could not convert co-ordinates to OS National Grid. Are the co-ordinates in range?");
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}
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// OSNG wants a precision that's an even number between 2 and 10
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if (precision % 2 !== 0) {
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precision = precision + 1;
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}
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if (precision > 10) {
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precision = 10;
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}
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convLat = osng.toString(precision);
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break;
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case "Universal Transverse Mercator":
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utm = latlon.toUtm();
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convLat = utm.toString(precision);
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break;
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}
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if (convLat === undefined) {
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throw new OperationError("Error converting co-ordinates.");
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}
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if (outFormat.includes("Degrees")) {
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// Format DD/DDM/DMS for output
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// If we're outputting a compass direction, remove the negative sign
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if (latDir === "S" && includeDir !== "None") {
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convLat = convLat.replace("-", "");
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}
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if (longDir === "W" && includeDir !== "None") {
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convLon = convLon.replace("-", "");
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}
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let outConv = "";
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if (includeDir === "Before") {
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outConv += latDir + " ";
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}
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outConv += convLat;
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if (includeDir === "After") {
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outConv += " " + latDir;
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}
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outConv += outDelim;
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if (isPair) {
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if (includeDir === "Before") {
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outConv += longDir + " ";
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}
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outConv += convLon;
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if (includeDir === "After") {
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outConv += " " + longDir;
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}
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outConv += outDelim;
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}
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conv = outConv;
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} else {
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conv = convLat + outDelim;
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}
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return conv;
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}
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/**
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* Split up the input using a space or degrees signs, and sanitise the result
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*
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* @param {string} input - The input data to be split
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* @returns {number[]} An array of the different items in the string, stored as floats
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*/
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function splitInput (input) {
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const split = [];
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input.split(/\s+/).forEach(item => {
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// Remove any character that isn't a digit, decimal point or negative sign
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item = item.replace(/[^0-9.-]/g, "");
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if (item.length > 0) {
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// Turn the item into a float
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split.push(parseFloat(item));
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}
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});
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return split;
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}
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/**
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* Convert Degrees Minutes Seconds to Decimal Degrees
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*
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* @param {number} degrees - The degrees of the input co-ordinates
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* @param {number} minutes - The minutes of the input co-ordinates
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* @param {number} seconds - The seconds of the input co-ordinates
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* @param {number} precision - The precision the result should be rounded to
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* @returns {{string: string, degrees: number}} An object containing the raw converted value (obj.degrees), and a formatted string version (obj.string)
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*/
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function convDMSToDD (degrees, minutes, seconds, precision) {
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const absDegrees = Math.abs(degrees);
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let conv = absDegrees + (minutes / 60) + (seconds / 3600);
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let outString = round(conv, precision) + "°";
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if (isNegativeZero(degrees) || degrees < 0) {
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conv = -conv;
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outString = "-" + outString;
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}
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return {
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"degrees": conv,
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"string": outString
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};
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}
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/**
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* Convert Decimal Degrees Minutes to Decimal Degrees
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*
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* @param {number} degrees - The input degrees to be converted
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* @param {number} minutes - The input minutes to be converted
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* @param {number} precision - The precision which the result should be rounded to
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* @returns {{string: string, degrees: number}} An object containing the raw converted value (obj.degrees), and a formatted string version (obj.string)
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*/
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function convDDMToDD (degrees, minutes, precision) {
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const absDegrees = Math.abs(degrees);
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let conv = absDegrees + minutes / 60;
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let outString = round(conv, precision) + "°";
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if (isNegativeZero(degrees) || degrees < 0) {
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conv = -conv;
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outString = "-" + outString;
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}
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return {
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"degrees": conv,
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"string": outString
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};
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}
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/**
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* Convert Decimal Degrees to Decimal Degrees
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*
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* Doesn't affect the input, just puts it into an object
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* @param {number} degrees - The input degrees to be converted
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* @param {number} precision - The precision which the result should be rounded to
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* @returns {{string: string, degrees: number}} An object containing the raw converted value (obj.degrees), and a formatted string version (obj.string)
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*/
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function convDDToDD (degrees, precision) {
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return {
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"degrees": degrees,
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"string": round(degrees, precision) + "°"
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};
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}
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/**
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* Convert Decimal Degrees to Degrees Minutes Seconds
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*
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* @param {number} decDegrees - The input data to be converted
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* @param {number} precision - The precision which the result should be rounded to
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* @returns {{string: string, degrees: number, minutes: number, seconds: number}} An object containing the raw converted value as separate numbers (.degrees, .minutes, .seconds), and a formatted string version (obj.string)
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*/
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function convDDToDMS (decDegrees, precision) {
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const absDegrees = Math.abs(decDegrees);
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let degrees = Math.floor(absDegrees);
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const minutes = Math.floor(60 * (absDegrees - degrees)),
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seconds = round(3600 * (absDegrees - degrees) - 60 * minutes, precision);
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let outString = degrees + "° " + minutes + "' " + seconds + "\"";
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if (isNegativeZero(decDegrees) || decDegrees < 0) {
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degrees = -degrees;
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outString = "-" + outString;
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}
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return {
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"degrees": degrees,
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"minutes": minutes,
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"seconds": seconds,
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"string": outString
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};
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}
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/**
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* Convert Decimal Degrees to Degrees Decimal Minutes
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*
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* @param {number} decDegrees - The input degrees to be converted
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* @param {number} precision - The precision the input data should be rounded to
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* @returns {{string: string, degrees: number, minutes: number}} An object containing the raw converted value as separate numbers (.degrees, .minutes), and a formatted string version (obj.string)
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*/
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function convDDToDDM (decDegrees, precision) {
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const absDegrees = Math.abs(decDegrees);
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let degrees = Math.floor(absDegrees);
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const minutes = absDegrees - degrees,
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decMinutes = round(minutes * 60, precision);
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let outString = degrees + "° " + decMinutes + "'";
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if (decDegrees < 0 || isNegativeZero(decDegrees)) {
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degrees = -degrees;
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outString = "-" + outString;
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}
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return {
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"degrees": degrees,
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"minutes": decMinutes,
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"string": outString,
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};
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}
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/**
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* Finds and returns the compass directions in an input string
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*
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* @param {string} input - The input co-ordinates containing the direction
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* @param {string} delim - The delimiter separating latitide and longitude
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* @returns {string[]} String array containing the latitude and longitude directions
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*/
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export function findDirs(input, delim) {
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const upperInput = input.toUpperCase();
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const dirExp = new RegExp(/[NESW]/g);
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const dirs = upperInput.match(dirExp);
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if (dirs) {
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// If there's actually compass directions
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// in the input, use these to work out the direction
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if (dirs.length <= 2 && dirs.length >= 1) {
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return dirs.length === 2 ? [dirs[0], dirs[1]] : [dirs[0], ""];
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}
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}
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// Nothing was returned, so guess the directions
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let lat = upperInput,
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long,
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latDir = "",
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longDir = "";
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if (!delim.includes("Direction")) {
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if (upperInput.includes(delim)) {
|
|
const split = upperInput.split(delim);
|
|
if (split.length >= 1) {
|
|
if (split[0] !== "") {
|
|
lat = split[0];
|
|
}
|
|
if (split.length >= 2 && split[1] !== "") {
|
|
long = split[1];
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
const split = upperInput.split(dirExp);
|
|
if (split.length > 1) {
|
|
lat = split[0] === "" ? split[1] : split[0];
|
|
if (split.length > 2 && split[2] !== "") {
|
|
long = split[2];
|
|
}
|
|
}
|
|
}
|
|
|
|
if (lat) {
|
|
lat = parseFloat(lat);
|
|
latDir = lat < 0 ? "S" : "N";
|
|
}
|
|
|
|
if (long) {
|
|
long = parseFloat(long);
|
|
longDir = long < 0 ? "W" : "E";
|
|
}
|
|
|
|
return [latDir, longDir];
|
|
}
|
|
|
|
/**
|
|
* Detects the co-ordinate format of the input data
|
|
*
|
|
* @param {string} input - The input data whose format we need to detect
|
|
* @param {string} delim - The delimiter separating the data in input
|
|
* @returns {string} The input format
|
|
*/
|
|
export function findFormat (input, delim) {
|
|
let testData;
|
|
const mgrsPattern = new RegExp(/^[0-9]{2}\s?[C-HJ-NP-X]{1}\s?[A-HJ-NP-Z][A-HJ-NP-V]\s?[0-9\s]+/),
|
|
osngPattern = new RegExp(/^[A-HJ-Z]{2}\s+[0-9\s]+$/),
|
|
geohashPattern = new RegExp(/^[0123456789BCDEFGHJKMNPQRSTUVWXYZ]+$/),
|
|
utmPattern = new RegExp(/^[0-9]{2}\s?[C-HJ-NP-X]\s[0-9.]+\s?[0-9.]+$/),
|
|
degPattern = new RegExp(/[°'"]/g);
|
|
|
|
input = input.trim();
|
|
|
|
if (delim !== null && delim.includes("Direction")) {
|
|
const split = input.split(/[NnEeSsWw]/);
|
|
if (split.length > 1) {
|
|
testData = split[0] === "" ? split[1] : split[0];
|
|
}
|
|
} else if (delim !== null && delim !== "") {
|
|
if (input.includes(delim)) {
|
|
const split = input.split(delim);
|
|
if (split.length > 1) {
|
|
testData = split[0] === "" ? split[1] : split[0];
|
|
}
|
|
} else {
|
|
testData = input;
|
|
}
|
|
}
|
|
|
|
// Test non-degrees formats
|
|
if (!degPattern.test(input)) {
|
|
const filteredInput = input.toUpperCase().replace(delim, "");
|
|
|
|
if (utmPattern.test(filteredInput)) {
|
|
return "Universal Transverse Mercator";
|
|
}
|
|
if (mgrsPattern.test(filteredInput)) {
|
|
return "Military Grid Reference System";
|
|
}
|
|
if (osngPattern.test(filteredInput)) {
|
|
return "Ordnance Survey National Grid";
|
|
}
|
|
if (geohashPattern.test(filteredInput)) {
|
|
return "Geohash";
|
|
}
|
|
}
|
|
|
|
// Test DMS/DDM/DD formats
|
|
if (testData !== undefined) {
|
|
const split = splitInput(testData);
|
|
switch (split.length) {
|
|
case 3:
|
|
return "Degrees Minutes Seconds";
|
|
case 2:
|
|
return "Degrees Decimal Minutes";
|
|
case 1:
|
|
return "Decimal Degrees";
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Automatically find the delimeter type from the given input
|
|
*
|
|
* @param {string} input
|
|
* @returns {string} Delimiter type
|
|
*/
|
|
export function findDelim (input) {
|
|
input = input.trim();
|
|
const delims = [",", ";", ":"];
|
|
const testDir = input.match(/[NnEeSsWw]/g);
|
|
if (testDir !== null && testDir.length > 0 && testDir.length < 3) {
|
|
// Possibly contains a direction
|
|
const splitInput = input.split(/[NnEeSsWw]/);
|
|
if (splitInput.length <= 3 && splitInput.length > 0) {
|
|
// If there's 3 splits (one should be empty), then assume we have directions
|
|
if (splitInput[0] === "") {
|
|
return "Direction Preceding";
|
|
} else if (splitInput[splitInput.length - 1] === "") {
|
|
return "Direction Following";
|
|
}
|
|
}
|
|
}
|
|
|
|
// Loop through the standard delimiters, and try to find them in the input
|
|
for (let i = 0; i < delims.length; i++) {
|
|
const delim = delims[i];
|
|
if (input.includes(delim)) {
|
|
const splitInput = input.split(delim);
|
|
if (splitInput.length <= 3 && splitInput.length > 0) {
|
|
// Don't want to try and convert more than 2 co-ordinates
|
|
return delim;
|
|
}
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Gets the real string for a delimiter name.
|
|
*
|
|
* @param {string} delim The delimiter to be matched
|
|
* @returns {string}
|
|
*/
|
|
export function realDelim (delim) {
|
|
return {
|
|
"Auto": "Auto",
|
|
"Space": " ",
|
|
"\\n": "\n",
|
|
"Comma": ",",
|
|
"Semi-colon": ";",
|
|
"Colon": ":"
|
|
}[delim];
|
|
}
|
|
|
|
/**
|
|
* Returns true if a zero is negative
|
|
*
|
|
* @param {number} zero
|
|
* @returns {boolean}
|
|
*/
|
|
function isNegativeZero(zero) {
|
|
return zero === 0 && (1/zero < 0);
|
|
}
|
|
|
|
/**
|
|
* Rounds a number to a specified number of decimal places
|
|
*
|
|
* @param {number} input - The number to be rounded
|
|
* @param {precision} precision - The number of decimal places the number should be rounded to
|
|
* @returns {number}
|
|
*/
|
|
function round(input, precision) {
|
|
precision = Math.pow(10, precision);
|
|
return Math.round(input * precision) / precision;
|
|
}
|