466 lines
16 KiB
TypeScript
466 lines
16 KiB
TypeScript
import * as express from "express";
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import * as http from "http";
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import * as https from "https";
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import * as SunCalc from "suncalc";
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import * as moment from "moment-timezone";
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import * as geoTZ from "geo-tz";
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import { BaseWateringData, GeoCoordinates, PWS, TimeData, WeatherData } from "../types";
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import { WeatherProvider } from "./weatherProviders/WeatherProvider";
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import { AdjustmentMethod, AdjustmentMethodResponse, AdjustmentOptions } from "./adjustmentMethods/AdjustmentMethod";
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import ManualAdjustmentMethod from "./adjustmentMethods/ManualAdjustmentMethod";
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import ZimmermanAdjustmentMethod from "./adjustmentMethods/ZimmermanAdjustmentMethod";
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import RainDelayAdjustmentMethod from "./adjustmentMethods/RainDelayAdjustmentMethod";
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const WEATHER_PROVIDER: WeatherProvider = new ( require("./weatherProviders/" + ( process.env.WEATHER_PROVIDER || "OWM" ) ).default )();
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const PWS_WEATHER_PROVIDER: WeatherProvider = new ( require("./weatherProviders/" + ( process.env.PWS_WEATHER_PROVIDER || "WUnderground" ) ).default )();
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// Define regex filters to match against location
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const filters = {
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gps: /^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?),\s*[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$/,
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pws: /^(?:pws|icao|zmw):/,
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url: /^https?:\/\/([\w\.-]+)(:\d+)?(\/.*)?$/,
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time: /(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})([+-])(\d{2})(\d{2})/,
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timezone: /^()()()()()()([+-])(\d{2})(\d{2})/
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};
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/** AdjustmentMethods mapped to their numeric IDs. */
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const ADJUSTMENT_METHOD: { [ key: number ] : AdjustmentMethod } = {
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0: ManualAdjustmentMethod,
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1: ZimmermanAdjustmentMethod,
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2: RainDelayAdjustmentMethod
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};
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/**
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* Resolves a location description to geographic coordinates.
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* @param location A partial zip/city/country or a coordinate pair.
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* @return A promise that will be resolved with the coordinates of the best match for the specified location, or
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* rejected with an error message if unable to resolve the location.
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*/
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async function resolveCoordinates( location: string ): Promise< GeoCoordinates > {
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if ( !location ) {
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throw "No location specified";
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}
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if ( filters.pws.test( location ) ) {
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throw "PWS ID must be specified in the pws parameter.";
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} else if ( filters.gps.test( location ) ) {
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const split: string[] = location.split( "," );
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return [ parseFloat( split[ 0 ] ), parseFloat( split[ 1 ] ) ];
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} else {
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// Generate URL for autocomplete request
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const url = "http://autocomplete.wunderground.com/aq?h=0&query=" +
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encodeURIComponent( location );
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let data;
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try {
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data = await httpJSONRequest( url );
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} catch (err) {
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// If the request fails, indicate no data was found.
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throw "An API error occurred while attempting to resolve location";
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}
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// Check if the data is valid
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if ( typeof data.RESULTS === "object" && data.RESULTS.length && data.RESULTS[ 0 ].tz !== "MISSING" ) {
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// If it is, reply with an array containing the GPS coordinates
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return [ parseFloat( data.RESULTS[ 0 ].lat ), parseFloat( data.RESULTS[ 0 ].lon ) ];
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} else {
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// Otherwise, indicate no data was found
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throw "No match found for specified location";
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}
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}
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}
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/**
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* Makes an HTTP/HTTPS GET request to the specified URL and parses the JSON response body.
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* @param url The URL to fetch.
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* @return A Promise that will be resolved the with parsed response body if the request succeeds, or will be rejected
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* with an error if the request or JSON parsing fails. This error may contain information about the HTTP request or,
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* response including API keys and other sensitive information.
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*/
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export async function httpJSONRequest(url: string ): Promise< any > {
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try {
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const data: string = await httpRequest(url);
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return JSON.parse(data);
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} catch (err) {
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// Reject the promise if there was an error making the request or parsing the JSON.
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throw err;
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}
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}
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/**
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* Calculates timezone and sunrise/sunset for the specified coordinates.
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* @param coordinates The coordinates to use to calculate time data.
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* @return The TimeData for the specified coordinates.
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*/
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function getTimeData( coordinates: GeoCoordinates ): TimeData {
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const timezone = moment().tz( geoTZ( coordinates[ 0 ], coordinates[ 1 ] )[ 0 ] ).utcOffset();
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const tzOffset: number = getTimezone( timezone, true );
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// Calculate sunrise and sunset since Weather Underground does not provide it
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const sunData = SunCalc.getTimes( new Date(), coordinates[ 0 ], coordinates[ 1 ] );
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sunData.sunrise.setUTCMinutes( sunData.sunrise.getUTCMinutes() + tzOffset );
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sunData.sunset.setUTCMinutes( sunData.sunset.getUTCMinutes() + tzOffset );
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return {
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timezone: timezone,
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sunrise: ( sunData.sunrise.getUTCHours() * 60 + sunData.sunrise.getUTCMinutes() ),
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sunset: ( sunData.sunset.getUTCHours() * 60 + sunData.sunset.getUTCMinutes() )
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};
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}
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/**
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* Checks if the weather data meets any of the restrictions set by OpenSprinkler. Restrictions prevent any watering
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* from occurring and are similar to 0% watering level. Known restrictions are:
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*
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* - California watering restriction prevents watering if precipitation over two days is greater than 0.1" over the past
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* 48 hours.
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* @param adjustmentValue The adjustment value, which indicates which restrictions should be checked.
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* @param weather Watering data to use to determine if any restrictions apply.
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* @return A boolean indicating if the watering level should be set to 0% due to a restriction.
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*/
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function checkWeatherRestriction( adjustmentValue: number, weather: BaseWateringData ): boolean {
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const californiaRestriction = ( adjustmentValue >> 7 ) & 1;
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if ( californiaRestriction ) {
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// TODO depending on which WeatherProvider is used, this might be checking if rain is forecasted in th next 24
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// hours rather than checking if it has rained in the past 48 hours.
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// If the California watering restriction is in use then prevent watering
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// if more then 0.1" of rain has accumulated in the past 48 hours
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if ( weather.precip > 0.1 ) {
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return true;
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}
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}
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return false;
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}
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export const getWeatherData = async function( req: express.Request, res: express.Response ) {
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const location: string = getParameter(req.query.loc);
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let coordinates: GeoCoordinates;
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try {
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coordinates = await resolveCoordinates( location );
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} catch (err) {
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res.send(`Error: Unable to resolve location (${err})`);
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return;
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}
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// Continue with the weather request
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const timeData: TimeData = getTimeData( coordinates );
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let weatherData: WeatherData;
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try {
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weatherData = await WEATHER_PROVIDER.getWeatherData( coordinates );
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} catch ( err ) {
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res.send( "Error: " + err );
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return;
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}
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res.json( {
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...timeData,
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...weatherData,
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location: coordinates
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} );
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};
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// API Handler when using the weatherX.py where X represents the
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// adjustment method which is encoded to also carry the watering
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// restriction and therefore must be decoded
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export const getWateringData = async function( req: express.Request, res: express.Response ) {
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// The adjustment method is encoded by the OpenSprinkler firmware and must be
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// parsed. This allows the adjustment method and the restriction type to both
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// be saved in the same byte.
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let adjustmentMethod: AdjustmentMethod = ADJUSTMENT_METHOD[ req.params[ 0 ] & ~( 1 << 7 ) ],
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checkRestrictions: boolean = ( ( req.params[ 0 ] >> 7 ) & 1 ) > 0,
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adjustmentOptionsString: string = getParameter(req.query.wto),
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location: string | GeoCoordinates = getParameter(req.query.loc),
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outputFormat: string = getParameter(req.query.format),
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remoteAddress: string = getParameter(req.headers[ "x-forwarded-for" ]) || req.connection.remoteAddress,
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pwsString: string = getParameter( req.query.pws ),
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adjustmentOptions: AdjustmentOptions;
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// X-Forwarded-For header may contain more than one IP address and therefore
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// the string is split against a comma and the first value is selected
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remoteAddress = remoteAddress.split( "," )[ 0 ];
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// Parse weather adjustment options
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try {
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// Parse data that may be encoded
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adjustmentOptionsString = decodeURIComponent( adjustmentOptionsString.replace( /\\x/g, "%" ) );
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// Reconstruct JSON string from deformed controller output
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adjustmentOptions = JSON.parse( "{" + adjustmentOptionsString + "}" );
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} catch ( err ) {
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// If the JSON is not valid then abort the claculation
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res.send(`Error: Unable to parse options (${err})`);
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return;
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}
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// Attempt to resolve provided location to GPS coordinates.
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let coordinates: GeoCoordinates;
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try {
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coordinates = await resolveCoordinates( location );
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} catch (err) {
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res.send(`Error: Unable to resolve location (${err})`);
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return;
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}
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let timeData: TimeData = getTimeData( coordinates );
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// Parse the PWS information.
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let pws: PWS | undefined = undefined;
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if ( pwsString ) {
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try {
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pws = parsePWS( pwsString );
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} catch ( err ) {
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res.send( `Error: ${ err }` );
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return;
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}
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}
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const weatherProvider = pws ? PWS_WEATHER_PROVIDER : WEATHER_PROVIDER;
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let adjustmentMethodResponse: AdjustmentMethodResponse;
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try {
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adjustmentMethodResponse = await adjustmentMethod.calculateWateringScale(
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adjustmentOptions, coordinates, weatherProvider, pws
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);
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} catch ( err ) {
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if ( typeof err != "string" ) {
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/* If an error occurs under expected circumstances (e.g. required optional fields from a weather API are
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missing), an AdjustmentOption must throw a string. If a non-string error is caught, it is likely an Error
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thrown by the JS engine due to unexpected circumstances. The user should not be shown the error message
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since it may contain sensitive information. */
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res.send( "Error: an unexpected error occurred." );
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console.error( `An unexpected error occurred for ${ req.url }: `, err );
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} else {
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res.send( "Error: " + err );
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}
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return;
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}
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let scale = adjustmentMethodResponse.scale;
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if ( checkRestrictions ) {
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let wateringData: BaseWateringData = adjustmentMethodResponse.wateringData;
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// Fetch the watering data if the AdjustmentMethod didn't fetch it and restrictions are being checked.
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if ( checkRestrictions && !wateringData ) {
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try {
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wateringData = await weatherProvider.getWateringData( coordinates );
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} catch ( err ) {
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res.send( "Error: " + err );
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return;
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}
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}
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// Check for any user-set restrictions and change the scale to 0 if the criteria is met
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if ( checkWeatherRestriction( req.params[ 0 ], wateringData ) ) {
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scale = 0;
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}
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}
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const data = {
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scale: scale,
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rd: adjustmentMethodResponse.rainDelay,
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tz: getTimezone( timeData.timezone, undefined ),
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sunrise: timeData.sunrise,
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sunset: timeData.sunset,
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eip: ipToInt( remoteAddress ),
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rawData: adjustmentMethodResponse.rawData,
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error: adjustmentMethodResponse.errorMessage
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};
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// Return the response to the client in the requested format
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if ( outputFormat === "json" ) {
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res.json( data );
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} else {
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// Return the data formatted as a URL query string.
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let formatted = "";
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for ( const key in data ) {
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// Skip inherited properties.
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if ( !data.hasOwnProperty( key ) ) {
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continue;
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}
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let value = data[ key ];
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switch ( typeof value ) {
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case "undefined":
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// Skip undefined properties.
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continue;
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case "object":
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// Convert objects to JSON.
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value = JSON.stringify( value );
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// Fallthrough.
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case "string":
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/* URL encode strings. Since the OS firmware uses a primitive version of query string parsing and
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decoding, only some characters need to be escaped and only spaces ("+" or "%20") will be decoded. */
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value = value.replace( / /g, "+" ).replace( /\n/g, "\\n" ).replace( /&/g, "AMPERSAND" );
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break;
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}
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formatted += `&${ key }=${ value }`;
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}
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res.send( formatted );
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}
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};
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/**
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* Makes an HTTP/HTTPS GET request to the specified URL and returns the response body.
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* @param url The URL to fetch.
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* @return A Promise that will be resolved the with response body if the request succeeds, or will be rejected with an
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* error if the request fails or returns a non-200 status code. This error may contain information about the HTTP
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* request or, response including API keys and other sensitive information.
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*/
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async function httpRequest( url: string ): Promise< string > {
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return new Promise< any >( ( resolve, reject ) => {
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const splitUrl: string[] = url.match( filters.url );
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const isHttps = url.startsWith("https");
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const options = {
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host: splitUrl[ 1 ],
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port: splitUrl[ 2 ] || ( isHttps ? 443 : 80 ),
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path: splitUrl[ 3 ]
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};
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( isHttps ? https : http ).get( options, ( response ) => {
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if ( response.statusCode !== 200 ) {
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reject( `Received ${ response.statusCode } status code for URL '${ url }'.` );
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return;
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}
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let data = "";
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// Reassemble the data as it comes in
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response.on( "data", ( chunk ) => {
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data += chunk;
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} );
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// Once the data is completely received, resolve the promise
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response.on( "end", () => {
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resolve( data );
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} );
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} ).on( "error", ( err ) => {
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// If the HTTP request fails, reject the promise
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reject( err );
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} );
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} );
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}
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/**
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* Checks if the specified object contains numeric values for each of the specified keys.
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* @param keys A list of keys to validate exist on the specified object.
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* @param obj The object to check.
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* @return A boolean indicating if the object has numeric values for all of the specified keys.
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*/
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export function validateValues( keys: string[], obj: object ): boolean {
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let key: string;
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// Return false if the object is null/undefined.
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if ( !obj ) {
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return false;
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}
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for ( key in keys ) {
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if ( !keys.hasOwnProperty( key ) ) {
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continue;
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}
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key = keys[ key ];
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if ( !obj.hasOwnProperty( key ) || typeof obj[ key ] !== "number" || isNaN( obj[ key ] ) || obj[ key ] === null || obj[ key ] === -999 ) {
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return false;
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}
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}
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return true;
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}
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/**
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* Converts a timezone to an offset in minutes or OpenSprinkler encoded format.
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* @param time A time string formatted in ISO-8601 or just the timezone.
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* @param useMinutes Indicates if the returned value should be in minutes of the OpenSprinkler encoded format.
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* @return The offset of the specified timezone in either minutes or OpenSprinkler encoded format (depending on the
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* value of useMinutes).
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*/
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function getTimezone( time: number | string, useMinutes: boolean = false ): number {
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let hour, minute;
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if ( typeof time === "number" ) {
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hour = Math.floor( time / 60 );
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minute = time % 60;
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} else {
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// Match the provided time string against a regex for parsing
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let splitTime = time.match( filters.time ) || time.match( filters.timezone );
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hour = parseInt( splitTime[ 7 ] + splitTime[ 8 ] );
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minute = parseInt( splitTime[ 9 ] );
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}
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if ( useMinutes ) {
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return ( hour * 60 ) + minute;
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} else {
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// Convert the timezone into the OpenSprinkler encoded format
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minute = ( minute / 15 >> 0 ) / 4;
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hour = hour + ( hour >= 0 ? minute : -minute );
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return ( ( hour + 12 ) * 4 ) >> 0;
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}
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}
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/**
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* Converts an IP address string to an integer.
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* @param ip The string representation of the IP address.
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* @return The integer representation of the IP address.
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*/
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function ipToInt( ip: string ): number {
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const split = ip.split( "." );
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return ( ( ( ( ( ( +split[ 0 ] ) * 256 ) + ( +split[ 1 ] ) ) * 256 ) + ( +split[ 2 ] ) ) * 256 ) + ( +split[ 3 ] );
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}
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/**
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* Returns a single value for a header/query parameter. If passed a single string, the same string will be returned. If
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* an array of strings is passed, the first value will be returned. If this value is null/undefined, an empty string
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* will be returned instead.
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* @param parameter An array of parameters or a single parameter value.
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* @return The first element in the array of parameter or the single parameter provided.
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*/
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function getParameter( parameter: string | string[] ): string {
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if ( Array.isArray( parameter ) ) {
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parameter = parameter[0];
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}
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// Return an empty string if the parameter is undefined.
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return parameter || "";
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}
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/**
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* Creates a PWS object from a string.
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* @param pwsString Information about the PWS in the format "pws:API_KEY@PWS_ID".
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* @return The PWS specified by the string.
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* @throws Throws an error message if the string is in an invalid format and cannot be parsed.
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*/
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function parsePWS( pwsString: string): PWS {
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const match = pwsString.match( /^pws:([a-f\d]{32})@([a-zA-Z\d]+)$/ );
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if ( !match ) {
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throw "Invalid PWS format.";
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}
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return {
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apiKey: match[ 1 ],
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id: match[ 2 ]
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};
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}
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