@realeyes/environment-detector/lib/capabilities.js

/**
 * Capabilities detection.
 *
 * @copyright Realeyes OU. All rights reserved.
 */


/**
 * Enum for capabilities that we can detect.
 *
 * @enum
 */
const names = {
    GET_USER_MEDIA: 'navigator.getUserMedia',
    MEDIA_RECORDER: 'MediaRecorder',
    WEBCAM: 'webcam',
    DOCUMENT_ALL: 'document.all',
    DOCUMENT_QUERY_SELECTOR: 'document.querySelector',
    HTTP: 'http',
    HTTPS: 'https',
    LOCALHOST: 'localhost',
};


/**
 * List of tests.
 */
const tests = [
    {
        capabilityName: names.GET_USER_MEDIA,

        test() {
            return !!(navigator.getUserMedia
                   || navigator.webkitGetUserMedia
                   || navigator.mozGetUserMedia
                   || navigator.msGetUserMedia
                   || (navigator.mediaDevices && navigator.mediaDevices.getUserMedia));
        },
    },
    {
        capabilityName: names.MEDIA_RECORDER,

        test() {
            return typeof window.MediaRecorder === 'function';
        },
    },
    {
        capabilityName: names.DOCUMENT_ALL,

        test() {
            return document.querySelector !== undefined;
        },
    },
    {
        capabilityName: names.DOCUMENT_QUERY_SELECTOR,

        test() {
            return typeof document.querySelector === 'function';
        },
    },
    {
        capabilityName: names.HTTP,

        test() {
            return document.location.protocol === 'http:';
        },
    },
    {
        capabilityName: names.HTTPS,

        test() {
            return document.location.protocol === 'https:';
        },
    },
    {
        capabilityName: names.LOCALHOST,

        test() {
            return document.location.hostname === 'localhost' || document.location.hostname === '127.0.0.1';
        },
    },
];


export default {
    names,

    /**
     * Returns the list of capabilities available in current browser.
     *
     * @return {Array.<string>}
     */
    detect() {
        const results = [];

        for (let i = 0; i < tests.length; i++) {
            if (tests[i].test()) {
                results.push(tests[i].capabilityName);
            }
        }

        return results;
    },
};