What is preventing the dependency injection of AuthHttp (angular2-jwt) into a component?

UPDATE: Success! Problem Solved

After much trial and error, I finally discovered the solution to my issue. It turned out that the problem lied in a simple configuration mistake. To rectify this, I made changes to both my package.json (dependencies section) and tsconfig.json files, aligning them with the sample provided on angular.io.

Key modifications included:

  • Upgrading angular npm packages from " ~4.0.0" to "~4.2.0"
  • Switching the module in tsconfig.json from "system" to "commonjs"

Although I don't entirely comprehend the impact of these alterations, they did the trick!

Original Inquiry

Situation Overview

Our team is working on integrating angular2-jwt into our Angular2/4 project by following the provided configuration example. The setup involves two main files:

app.module.ts

import { AuthConfig, AuthHttp } from 'angular2-jwt';
import { NgModule } from '@angular/core';
import { HttpModule, Http, RequestOptions } from '@angular/http';
import { BrowserModule } from '@angular/platform-browser';

import { AppRoutingModule, routingComponents } from './app.routing';

import { AppComponent } from './Components/app.component';

@NgModule({
    imports: [BrowserModule, HttpModule, AppRoutingModule],
    declarations: [AppComponent, routingComponents],
    bootstrap: [AppComponent],
    providers: [
        {
            provide: AuthHttp,
            useFactory: (http: Http, options: RequestOptions) => new AuthHttp(new AuthConfig(), http, options),
            deps: [Http, RequestOptions]
        }]
})
export class AppModule { }

app.component.ts

import { Component } from '@angular/core';
import { AuthHttp } from 'angular2-jwt';

@Component({
    selector: "app",
    templateUrl: "/App/Components/app.component.html"
})
export class AppComponent
{
    constructor(service: AuthHttp)
    { }
}

Error Encountered

Can't resolve all parameters for AppComponent: (?).

Upon examining the constructor of the AuthHttp class (found in the .d.ts file), it became apparent that the likely culprit was the malfunctioning include for AuthConfig, as attempts to instantiate this class resulted in an error indicating that the constructor was not found.

I stumbled upon a resource suggesting a deeper dive into Dependency Injection (DI), but everything seemed correct from my perspective. https://github.com/auth0/angular2-jwt/issues/88

Update: Additional Insight Uncovered

If the AppComponent constructor were altered to invoke new AuthConfig(), it would translate to new angular2_jwt_1.AuthConfig() in the transpiled js file (resulting in a constructor non-existence error). However, manually changing this to

new angular2_jwt_1.default.AuthConfig()
in the js file led to successful instance creation. Could this be linked to the root cause?

Answer №1

Although I couldn't pinpoint the exact cause of the issue, it seems to be configuration-related. To work around this issue, I decided not to use the angular2-jwt library and instead manually add the bearer token to the request based on this angular2 jwt authentication article.

Here is how you can obtain the bearer token:

public Login(username: string, password: string): Observable<boolean>
{
    // Prepare post headers
    var headers: Headers = new Headers();
    headers.append('Content-Type', 'application/x-www-form-urlencoded');

    // Prepare credential request
    var body: string = "grant_type=password&scope=scopes go here&username=" + username + "&password=" + password;

    return this.http
        .post("token url here", body, { headers: headers })
        .map((response: Response) =>
        {
            let token = response.json();
            token = token && token.access_token;
            if (!token)
                return false;
            else
            {
                localStorage.setItem('username', username);
                localStorage.setItem('token', token);
                return true;
            }
        });
}

And here is how you can make an authenticated request (Token property retrieves the current token from localStorage):

public Post<T>(url: string, body: string): Observable<T>
{
    let headers = new Headers({ 'Authorization': 'Bearer ' + this.Token });
    let options = new RequestOptions({ headers: headers });

    return this.http
        .post(url, body)
        .map((response: Response) => response.json());
}

I am still searching for a more optimal solution and a detailed explanation as to why the original approach did not work!

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