index.js

const https = require('https');

const RANGES = ['1h', '1d', '5d', '1mo', '1y', 'max'];

const get = url =>
    new Promise((resolve, reject) => {
        const req = https.get(url, res => {
            let data = '';
            res.on('data', d => {
                data += d;
            });
            res.on('end', () => {
                resolve(data);
            });
        });
        req.on('error', e => {
            reject(e);
        });
    });

const getJson = url =>
    new Promise((resolve, reject) => {
        get(url)
            .then(resp => JSON.parse(resp))
            .then(resolve)
            .catch(reject);
    });

const lookup = symbol =>
    new Promise((resolve, reject) => {
        Promise.all([
            getJson(
                `https://autoc.finance.yahoo.com/autoc?query=${symbol}&region=1&lang=en`
            ),
            getJson(
                `https://query1.finance.yahoo.com/v10/finance/quoteSummary/${symbol}?&modules=summaryProfile,financialData`
            ),
        ])
            .then(responses => {
                if (!responses[0].ResultSet.Result.length) {
                    reject(true);
                    return;
                }
                const financialData =
                    responses[1].quoteSummary.result[0].financialData;
                resolve({
                    symbol,
                    name: responses[0].ResultSet.Result[0].name,
                    exchange: responses[0].ResultSet.Result[0].exchDisp,
                    currentPrice: financialData.currentPrice.raw,
                    highPrice: financialData.targetHighPrice.raw,
                    lowPrice: financialData.targetLowPrice.raw,
                    meanPrice: financialData.targetMeanPrice.raw,
                    medianPrice: financialData.targetMedianPrice.raw,
                });
            })
            .catch(reject);
    });

const history = (symbol, args) =>
    new Promise((resolve, reject) => {
        let options = {
            range: '1wk',
            interval: '1d',
            ...args,
        };

        getJson(
            `https://query2.finance.yahoo.com/v7/finance/chart/${symbol}?range=${
                options.range
            }&interval=${
                options.interval
            }&indicators=quote&includeTimestamps=true&includePrePost=true&events=div%7Csplit%7Cearn`
        )
            .then(response => {
                const quote = response.chart.result[0].indicators.quote[0];
                const meta = response.chart.result[0].meta;
                const h = response.chart.result[0].timestamp.map(
                    (time, idx) => {
                        return {
                            time,
                            close: quote.close[idx],
                            open: quote.open[idx],
                            high: quote.high[idx],
                            low: quote.low[idx],
                            volume: quote.volume[idx],
                        };
                    }
                );
                resolve({
                    previousClose: meta.chartPreviousClose,
                    records: h,
                });
            })
            .catch(reject);
    });

module.exports = {
    lookup,
    history,
};