terriajs/lib/Map/getUrlForImageryTile.js

Geospatial data visualization platform.

var ImageryProvider = require('terriajs-cesium/Source/Scene/ImageryProvider');
var URI = require('urijs');
var when = require('terriajs-cesium/Source/ThirdParty/when');

function getUrlForImageryTile(imageryProvider, x, y, level) {
    const oldLoadImage = ImageryProvider.loadImage;

    let tileUrl;
    try {
        ImageryProvider.loadImage = function(imageryProvider, url) {
            if (typeof url === 'string' || url instanceof String) {
                tileUrl = url;
            } else if (url && url.url) {
                tileUrl = url.url;

                // Add the Cesium Ion access token if there is one.
                if (url._ionEndpoint && url._ionEndpoint.accessToken) {
                    tileUrl = new URI(tileUrl).addQuery('access_token', url._ionEndpoint.accessToken).toString();
                }
            }
            return when();
        };

        imageryProvider.requestImage(x, y, level);
    } finally {
        ImageryProvider.loadImage = oldLoadImage;
    }

    return tileUrl;
}

module.exports = getUrlForImageryTile;