Issues arise when attempting to integrate SystemJs with Windows authentication and TypeScript in Angular 4

Struggling to configure my Angular 4 application to work with windows authentication. It works fine with anonymous authentication, but fails when switched to windows auth. The initial error encountered was:

(index):38 Error: Fetch error: 401 Unauthorized
  Instantiating http://localhost:1264/app/main.js
  Loading app
    at http://localhost:1264/node_modules/systemjs/dist/system.src.js:1500:13 [<root>]
    at Zone.run (http://localhost:1264/node_modules/zone.js/dist/zone.js:125:43) [<root> => <root>]
    at http://localhost:1264/node_modules/zone.js/dist/zone.js:760:57 [<root>]
    at Zone.runTask (http://localhost:1264/node_modules/zone.js/dist/zone.js:165:47) [<root> => <root>]
    at drainMicroTaskQueue (http://localhost:1264/node_modules/zone.js/dist/zone.js:593:35) [<root>]
    at <anonymous> [<root>]

The issue seems linked to the way `main.js` is loaded using SystemJs in `Systemjs.config.js` file:

    packages: {
  app: {
    main: './main.js',
    defaultExtension: 'js'
  },

To resolve this, additional attributes are suggested:

packages: {
      app: {
        main: './main.js',
        defaultExtension: 'js',
        format: 'register',
        scriptLoad: true
      },

Adding `format` and `scriptLoad` attributes helps overcome the authorization issues, but triggers another error:

Uncaught Error: Module name "@angular/platform-browser-dynamic" has not been loaded yet for context: _. Use require([])
http://requirejs.org/docs/errors.html#notloaded
    at F (require.js:7) [<root>]
    at Object.m [as require] (require.js:26) [<root>]
    at requirejs (require.js:32) [<root>]
    at :1264/app/main.js:2:34 [<root>]

This new error arises from a `require` statement within `main.js`, causing conflicts within the SystemJs context.

The usage of `require` stems from the module setting in the typescript json file. Setting it to commonjs avoids 401 unauthorized errors, unlike other module types such as system.

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    ...
}

If interested, the application developed in Visual Studio 2017 Enterprise is available on Bitbucket under the repository named Angular2VS2015.

In summary, how can I make my app function properly under windows authentication?

Answer №1

After diving into the code, I finally cracked the puzzle. It turns out that the root cause of the issue lies within SystemJs. This library, when fetching included files from the server, triggers XHR calls. Essentially, it's akin to making a request to a webapi service using JavaScript - and if you lack proper authentication, you'll be met with a discouraging 401 Unauthorized error.

To circumvent this obstacle, one must ensure that the necessary authorization headers are appended to the SystemJs requests. The solution involves integrating a meta tag in the System.Config script, specifically setting the authorization attribute to true. Below is my revised systemjs.config.js file, showcasing the addition of the meta tag at the top to facilitate smooth authorization functionality.

/**
 * Configuration settings for Angular samples
 * Adapt as per your application requirements.
 */
(function (global) {
    System.config({
        meta: {
            '*': { authorization: true }
        },
        paths: {
            // aliased paths 
            'npm:': 'node_modules/'
        },
        // mapping indicates where the System loader should search for resources
        map: {
            // locating our app within the app directory
            app: 'app',

            // angular bundles
            '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
            '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
            '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
            '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
            '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
            '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
            '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
            '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
            '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',

            // additional libraries
            'rxjs': 'npm:rxjs',
            'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
            'ej-angular2': 'npm:ej-angular2'
        },
        // packages define how the System loader loads content without filename or extension specified
        packages: {
            app: {
                main: './main.js',
                defaultExtension: 'js'
            },
            rxjs: {
                defaultExtension: 'js'
            },
            'ej-angular2': {
                main: './src/index.js'
            }
        }
    });
})(this);

I hope this detailed explanation proves beneficial to fellow developers grappling with a similar challenge. Understanding and resolving this issue was undeniably an arduous undertaking.

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