I was created one project with laravel 5.4 and custom authentication to one table of Dynamics NAV (2017) trough web services, these are the steps that I was make to do this:

  • I was folow some steps As this article explains perfectly: CustomUserProvider.php 
      • Modify config/auth.php: 
            'providers' => [
        'users' => [
            //'driver' => 'eloquent',
            'driver' => 'customuserprovider',
            'model' => App\User::class,
        ],

        // 'users' => [
        //     'driver' => 'database',
        //     'table' => 'users',
        // ],
    ],
      • but then Modify providers/AuthServiceProvider to use my own customuserprovider: 
         <?php namespace App\Providers; use Illuminate\Support\Facades\Gate; use Illuminate\Foundation\Support\Providers\AuthServiceProvider as ServiceProvider; class AuthServiceProvider extends ServiceProvider { /** * The policy mappings for the application. * * @var array */ protected $policies = [ 'App\Model' => 'App\Policies\ModelPolicy',
    ];

    /**
     * Register any authentication / authorization services.
     *
     * @return void
     */
    public function boot()
    {
        $this->registerPolicies();
        // added to modify auth provider that's the trick
         \Illuminate\Support\Facades\Auth::provider('customuserprovider', function($app, array $config) {
        return new CustomUserProvider($app['hash'], $config['model']);
            });
        //
    }
}

    • Create a new file in providers/CustomUserProvider.php As yoy can see in the code that is very simple, I was replaced the functions retrieveByCredentials and retrieveById with my ownsThe functions checkUser and ReadUser, make the calls to DynamicsNAV websevices (Customer Table), I use Guzzle that is very easy to implement, and  in the funcion checkUser only reads the user trough Odata, ( with filter expressions as says Microsoft) then validate the field  “Password” , I have 3 new variables in .env file: 
      HTTP_URIBASE=http://www.myserver.com/MYDyanmicsNavService/ODataV4/Company('MyCompany')
HTTP_USERNAME=user
HTTP_PASSWORD=password

      Is very important to have NTLM active on Microsoft Dynamics NAV service , if not it not works, becose Microsoft Dynamics NAV uses new OAuth  that is more complex 
      this is the file that makes all the job CustomUserProvider.php:

      <?php namespace App\Providers; use Illuminate\Auth\EloquentUserProvider as UserProvider; use Illuminate\Contracts\Auth\Authenticatable as UserContract; use GuzzleHttp\Client as GuzzleHttpClient; use GuzzleHttp\Exception\RequestException; use GuzzleHttp\Psr7\Response; class CustomUserProvider extends UserProvider { public function validateCredentials(UserContract $user, array $credentials) { $plain = $credentials['password']; //return $this->hasher->check($plain, $user->getAuthPassword());
        return true;
    }
    public function retrieveByCredentials(array $credentials)
    {
        if (empty($credentials)) {
            return;
        }
        // Internal function to retrieve the user:
        $resultat =$this->checkUser($credentials);
        
        // the user not exists
        if (empty($resultat)){
            return;
        }
        //password incorrect
        if ($resultat->{'value'}[0]->{'Contraseña'}!=$credentials['password']){
            return;
        }
        //create new user to return

        $user = new \App\User();
        $user->id=$resultat->{'value'}[0]->{'No'};
        $user->name  =  $credentials['email'];
        $user->email =  $credentials['email'];
        $user->password = bcrypt( $credentials['password']);
        //$user->remember_token = $request->_token;
        //$user->save();
		return $user;
	
    }
      public function retrieveById($identifier)
    {
        $resultat =$this->ReadUser($identifier);
     
        $user = new \App\User();
        $user->id=$resultat->{'value'}[0]->{'No'};
        $user->name  =  $resultat->{'value'}[0]->{'Usuario'};
        $user->email =  $resultat->{'value'}[0]->{'Usuario'};
        $user->password = bcrypt( $resultat->{'value'}[0]->{'Contraseña'});
     	return $user;
    }
    public function updateRememberToken(UserContract $user, $token)
    {
        $user->setRememberToken($token);
        $timestamps = $user->timestamps;
        $user->timestamps = false;
        //$user->save();
        $user->timestamps = $timestamps;
    }
    public function checkUser(array $credentials)
    {
      //function to make the call to the web service with guzzle,DynamicsNAV table Customer, field=Usuario
     // try {
 
           $client = new GuzzleHttpClient();
           $uri=env('HTTP_URIBASE', '');
           
 
           $apiRequest = $client->request('GET', $uri.'/Customer?$filter=Usuario eq \''.$credentials['email'].'\'',[
                'auth' => [env('HTTP_USERNAME', 'usuari'),env('HTTP_PASSWORD', ''), 'ntlm' ],       //If authentication required
                //'debug' => true                                  //If needed to debug   
          ]);
 

          $content = json_decode($apiRequest->getBody()->getContents());
          return $content;
 
     // } catch (RequestException $re) {
          //For handling exception
     // }
    }
    public function ReadUser($identifier)
    {
      //function to read the user at the web service with guzzle,DynamicsNAV table Customer, field=No
     // try {
 
           $client = new GuzzleHttpClient();
           $uri=env('HTTP_URIBASE', '');
          // $uri=str_replace("%27","'" ,$uri);
           
 
           $apiRequest = $client->request('GET', $uri.'/Customer?$filter=No eq \''.$identifier.'\'',[
                'auth' => [env('HTTP_USERNAME', 'usuari'),env('HTTP_PASSWORD', ''), 'ntlm' ],       //If authentication required
                //'debug' => true                                  //If needed to debug   
          ]);
 

          $content = json_decode($apiRequest->getBody()->getContents());
          return $content;
 
     // } catch (RequestException $re) {
          //For handling exception
     // }
    }

}
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