Stackedit/public/res/providers/downloadProvider.js

define([
    "jquery",
    "constants",
    "eventMgr",
    "utils",
    "fileMgr",
    "classes/Provider",
    "classes/AsyncTask"
], function($, constants, eventMgr, utils, fileMgr, Provider, AsyncTask) {

    var downloadProvider = new Provider("download");
    downloadProvider.sharingAttributes = [
        "url"
    ];

    downloadProvider.importPublic = function(importParameters, callback) {
        var title;
        var content;
        var task = new AsyncTask(true);
        task.onRun(function() {
            var url = importParameters.url;
            var slashUrl = url.lastIndexOf("/");
            if(slashUrl === -1) {
                task.error(new Error("Invalid URL parameter."));
                return;
            }
            title = url.substring(slashUrl + 1);
            $.ajax({
                url: constants.DOWNLOAD_PROXY_URL + "download?url=" + url,
                type: "GET",
                dataType: "text",
                timeout: constants.AJAX_TIMEOUT
            }).done(function(result) {
                content = result;
                task.chain();
            }).fail(function() {
                task.error(new Error("Unable to access URL " + url));
            });
        });
        task.onSuccess(function() {
            callback(undefined, title, content);
        });
        task.onError(function(error) {
            callback(error);
        });
        task.enqueue();
    };

    eventMgr.addListener("onReady", function() {
        $('.action-import-url').click(function(e) {
            var url = utils.getInputTextValue('#input-import-url', e);
            if(url) {
                downloadProvider.importPublic({
                    url: url
                }, function(error, title, content) {
                    if(error) {
                        return;
                    }
                    var fileDesc = fileMgr.createFile(title, content);
                    fileMgr.selectFile(fileDesc);
                });
            }
        });
    });

    return downloadProvider;
});