dce-expresskit/lib/helpers/parseUserAgent.js

Shared functions, helpers, and tools for Harvard DCE Express-based servers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Perform a rudimentary parsing of the user's browser agent string
 * @author Gabe Abrams
 * @param userAgent the user's browser agent
 * @returns user info
 */
var parseUserAgent = function (userAgent) {
    /* ------------- Browser ------------ */
    var browser = {
        name: 'Unknown',
        version: 'Unknown',
    };
    // Parse user agent
    var verOffset;
    var nameOffset;
    if ((verOffset = userAgent.indexOf('Opera')) !== -1) {
        // In Opera, the true version is after 'Opera' or after 'Version'
        browser = {
            name: 'Opera',
            version: userAgent.substring(verOffset + 6),
        };
        if ((verOffset = userAgent.indexOf('Version')) !== -1) {
            browser.version = userAgent.substring(verOffset + 8);
        }
    }
    else if ((verOffset = userAgent.indexOf('MSIE')) !== -1) {
        // In MSIE, the true version is after 'MSIE' in userAgent
        browser = {
            name: 'Internet Explorer',
            version: userAgent.substring(verOffset + 5),
        };
    }
    else if ((verOffset = userAgent.indexOf('Chrome')) !== -1) {
        // In Chrome, the true version is after 'Chrome'
        browser = {
            name: 'Chrome',
            version: userAgent.substring(verOffset + 7),
        };
    }
    else if ((verOffset = userAgent.indexOf('Safari')) !== -1) {
        // In Safari, the true version is after 'Safari' or after 'Version'
        browser = {
            name: 'Safari',
            version: userAgent.substring(verOffset + 7),
        };
        if ((verOffset = userAgent.indexOf('Version')) !== -1) {
            browser.version = userAgent.substring(verOffset + 8);
        }
    }
    else if ((verOffset = userAgent.indexOf('Firefox')) != -1) {
        // In Firefox, the true version is after 'Firefox'
        browser = {
            name: 'Firefox',
            version: userAgent.substring(verOffset + 8),
        };
    }
    else if ((nameOffset = userAgent.lastIndexOf(' ') + 1)
        < (verOffset = userAgent.lastIndexOf('/'))) {
        browser = {
            name: userAgent.substring(nameOffset, verOffset),
            version: userAgent.substring(verOffset + 1),
        };
    }
    // Postprocess version
    // trim the fullVersion string at semicolon/space if present
    var ix;
    if ((ix = browser.version.indexOf(';')) !== -1) {
        browser.version = browser.version.substring(0, ix);
    }
    if ((ix = browser.version.indexOf(' ')) !== -1) {
        browser.version = browser.version.substring(0, ix);
    }
    /* ------------- Device ------------- */
    // Detect os
    var os = 'Unknown';
    if (userAgent.includes('Linux')) {
        os = 'Linux';
    }
    else if (userAgent.includes('like Mac')) {
        os = 'iOS';
    }
    else if (userAgent.includes('Mac')) {
        os = 'Mac';
    }
    else if (userAgent.includes('Android')) {
        os = 'Android';
    }
    else if (userAgent.includes('Win')) {
        os = 'Win';
    }
    // Check if mobile
    var isMobile = !!userAgent.match(/(iPhone|iPod|iPad|Android|BlackBerry)/);
    // Device
    var device = {
        isMobile: isMobile,
        os: os,
    };
    /* ------------- Finish ------------- */
    // Return info
    return {
        browser: browser,
        device: device,
    };
};
exports.default = parseUserAgent;
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