hk-bus-eta/esm/lrtfeeder.js

Query the ETA (Estimated Time of Arrival) of HK Bus/Minibus/MTR/Lightrail

import { isSafari } from "./utils";
export default function fetchEtas({ stopId, route, language, }) {
    return fetch(`https://rt.data.gov.hk/v1/transport/mtr/bus/getSchedule`, {
        method: "POST",
        cache: isSafari ? "default" : "no-store",
        headers: {
            "Content-Type": "application/json",
        },
        body: JSON.stringify({
            language: language,
            routeName: route,
        }),
    })
        .then((response) => response.json())
        .then(({ busStop, routeStatusRemarkTitle }) => {
        if (busStop.length === 0) {
            if (routeStatusRemarkTitle &&
                typeof routeStatusRemarkTitle === "string") {
                return [
                    {
                        eta: "",
                        remark: {
                            [language]: routeStatusRemarkTitle,
                        },
                        dest: {
                            zh: "",
                            en: "",
                        },
                        co: "lrtfeeder",
                    },
                ];
            }
        }
        return busStop
            .filter(({ busStopId }) => busStopId === stopId)
            .reduce((ret, { bus: buses }) => [
            ...ret,
            ...buses.reduce((etas, bus) => {
                // hackily use +8 hours and use UTC hour to resolve timezone issue
                const etaDate = new Date(Date.now() +
                    parseInt(bus.arrivalTimeInSecond === "108000"
                        ? bus.departureTimeInSecond
                        : bus.arrivalTimeInSecond, 10) *
                        1000 +
                    8 * 3600000);
                return [
                    ...etas,
                    {
                        eta: `${etaDate.getUTCFullYear()}-${`0${etaDate.getUTCMonth() + 1}`.slice(-2)}-${`0${etaDate.getUTCDate()}`.slice(-2)}` +
                            `T${`0${etaDate.getUTCHours()}`.slice(-2)}:${`0${etaDate.getMinutes()}`.slice(-2)}:${`0${etaDate.getSeconds()}`.slice(-2)}+08:00`,
                        remark: {
                            zh: bus.busRemark || (bus.isScheduled === "1" ? "預定班次" : ""),
                            en: bus.busRemark || (bus.isScheduled === "1" ? "Scheduled" : ""),
                        },
                        dest: {
                            zh: "",
                            en: "",
                        },
                        co: "lrtfeeder",
                    },
                ];
            }, []),
        ], []);
    });
}
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