koel/resources/assets/js/services/utils.js

import isMobile from 'ismobilejs';

/**
 * Convert a duration in seconds into H:i:s format.
 * If H is 0, it will be ommited.
 */
export function secondsToHis(d) {
    d = parseInt(d, 10);

    let s = d % 60;

    if (s < 10) {
        s = '0' + s;
    }

    let i = Math.floor((d / 60) % 60);

    if (i < 10) {
        i = '0' + i;
    }

    let h = Math.floor(d / 3600);

    if (h < 10) {
        h = '0' + h;
    }

    return (h === '00' ? '' : h + ':') + i + ':' + s;
};

/**
 * Parse the validation error from the server into a flattened array of messages.
 *
 * @param  {Object}  error  The error object in JSON format.
 *
 * @return {Array.<String>}
 */
export function parseValidationError(error) {
    return Object.keys(error).reduce((messages, field) => messages.concat(error[field]), []);
};

/**
 * Check if AudioContext is supported by the current browser.
 *
 * @return {Boolean}
 */
export function isAudioContextSupported() {
    // Apple device just doesn't love AudioContext that much.
    if (isMobile.apple.device) {
        return false;
    }

    const AudioContext = (window.AudioContext ||
        window.webkitAudioContext ||
        window.mozAudioContext ||
        window.oAudioContext ||
        window.msAudioContext);

    if (!AudioContext) {
        return false;
    }

    // Safari (MacOS & iOS alike) has webkitAudioContext, but is buggy.
    // @link http://caniuse.com/#search=audiocontext
    if (!(new AudioContext()).createMediaElementSource) {
        return false;
    }

    return true;
};

/**
 * Turn <br> into new line characters.
 *
 * @param  {string} str
 *
 * @return {string}
 */
export function br2nl(str) {
    return str.replace(/<br\s*[\/]?>/gi, '\n');
};