Quick start using Agama Lab

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In this quick start guide, we will build, deploy and test a simple Agama project using the Agama Lab. This project will enable user authentication using password when deployed on an IDP.

Major Steps involved in this process are:

Create a new Agama project on the Agama Lab
Defining the authentication flow
Design the user interface
Deploy Agama project
Test using Tarp

This guide covers steps above in the following sections.

Prerequisites

We will use the Janssen Server to deploy the Agama project. Follow the instructions here to install the Janssen Server.
You will need a GitHub account where Agama Lab GitHub app has been integrated. GitHub account can be a personal account or an organizational account. For this guide we will assume that a personal account is being used.
Two new public GitHub repositories in your GitHub Account. These repositories will be used as development repository and release repository. Each repository should have at least one commit.
Agama Lab should have permissions to access the development and the release repositories. This can be configured using the Agama Lab GitHub app in your user account.

Create a new Agama project

We will use Agama Lab to create a simple username-password based user authentication project. The authentication flow will be similar to the one shown below.

An Agama project may include multiple components. For example, an authentication flow, a user interface, assets like organization’s logo, external libraries, etc. In this project, we will see how to

Define the authentication steps of a flow
Design the user interface to capture user inputs

Let’s get started.

Log into the Agama Lab

Go to Agama Lab login page. Sign in using GitHub.
Authenticate on the GitHub authentication page.
After successful sign in, the project dashboard will be shown. Next step is to select the repository where you want to create the project. Select the development repository by clicking on Change Repository -> Your Repositories -> select the repository -> Select.
The project dashboard with all the existing projects (if any) from the GitHub repository will be shown. New projects can be created, edited, and deleted from this project listing page.

Create a new project

To create a new project, click on the New Project button. Enter the name and the description for the new project and click the Create button.
This will create a new project.

Defining the authentication flow

Create a flow file

Open the newly created project by clicking on . This will open the project in the project editor. To start creating the flow, right-click on the code directory > New > Flow File.
Give name and description for the flow file and then click Create.
A newly created flow file contains one start block.
In the subsequent steps, we are going to create nodes in the flow using the flow editor. Refer to this guide if you need to understand how to create, delete and configure nodes.

Create Get class reference Call block

To perform authentication we need to validate username and password provided by the user with the IDP. This operation is done using an instance reference of AuthenticationService class.
To get the instance reference from the IDP, we first need the class reference of the AuthenticationService class. That is what we will do in this step.
Drag the colored dot available on the right edge of the start node to create the next node in the flow. A list of available node types will be presented.
Select Call node. A new Call block should appear with a link to the Start block
Click the Call block and then click edit to open the configuration screen. Add configuration values as shown below. This configuration will fetch a class reference of the AuthenticationService class and store the reference in a variable called authServiceClass. This reference will be used to fetch an instance of this class from IDP in the subsequent steps. Call type: Call static method class name: io.jans.as.server.service.AuthenticationService method name: class assign result to: authServiceClass

Create Get instance reference Call block In this step, we will fetch the instance reference of the AuthenticationService using the class reference that we obtained in the previous step. To fetch this instance reference from the IDP, we will use CdiUtil class’s bean method and pass the class reference of the AuthenticationService as an input to it. Use the steps and configuration below to do this. After the Get class reference node, create a new Call node. Click on the newly created Call block and by clicking edit open the configuration page. Input values as shown below in the configuration screen.

Call type: Call static method

class name: io.jans.service.cdi.util.CdiUtil

method name: bean

arguments: authServiceClass

assign result to: authService
Create result object Assignment block Next, we need to create an empty variable to store authentication results when we validate the credentials in subsequent steps. Create a Assignment block after the Get instance reference call block and configure it as shown below.
Resultant variable: authResult
Create Repeat block

Repeat block represents the Repeat instruction of Agama DSL.
Repeat block creates a loop to iterate over certain steps(blocks). We will create a repeat loop that allows 3 retries if the authentication fails.
Create a Repeat block after the Create result object block
Click on the newly created Repeat block. Click on edit. Input values as shown below in the configuration screen

Create a Show login form RRF block

RRF block represents the RRF instruction of Agama DSL. We will present the login form to the user using this node.
Create an RRF block after the Retry Authentication block.
Remember that the Retry Authentication is a Repeat type of block. It has two possible paths.
- One that originates from the colored dot on the bottom edge will be labeled as repeat. Execution of the blocks along this path will be repeated as configured in the Repeat block.
- Second path originates from the colored dot on the right edge of the Repeat block. This path is labeled as Continue. These blocks will be executed after repeat path completes the execution.
The new RRF block should be created on the Repeat path.
Click on the newly created RRF block. Click edit. Input values as shown below in the configuration screen.

Template path: login.ftlh
Data variable to inject: authResult
Assign result to: creds
With this configuration, the RRF block will
- Present an input form to the user. We will build the login.ftlh in a later section
- Capture and store user inputs like the user-name and password into the creds variable.
  At this stage, let’s save the flow using the Save button. This creates a new commit in your GitHub repository.

Create validate credentials call block

Create a Call block to process the username and password received from the user (in RRF) and validate them. The result of the validation is stored in a variable. Create a new call block after the Show login page block.
Click on the newly created Call block. Click edit. Configure it as shown below.
Call type: Call method on instance
Variable name: authService
Method name: authenticate
Arguments: creds.username and creds.password
Assign result to: authResult.success

Create a conditional When block When block represents the When instruction of Agama DSL. Create a conditional check using the When block to check if the user credentials were successfully validated. Create a new When block after the Validate credentials block.

Click on the newly created When block. Click on edit . Input values as shown below in the configuration screen

Create Finish blocks

The Finish block represents the Flow finish instruction of Agama DSL.
We will need to create two finish blocks.
- One finish block to terminate the flow when the authentication is successful.
- Second finish block to terminate the flow when the authentication is still not successful after 3 repeated attempts.
If the authentication was successful then the flow should finish and return the username. This will be achieved by adding a Finish block to the Condition met branch of the When block. And if authentication fails after 3 attempts, we need another Finish block following the Repeat block.
Drag and drop the colored dot on the lower vertex of the When block to create a Condition met branch. Create a Finish block on this branch.
Click on the newly created Finish block. Click on edit. Input values as shown below in the configuration screen
Let’s create a second finish block that will terminate the flow when all 3 authentication attempts have failed.
Create a Finish block on the Continue branch of the Repeat block.
Click on the newly created Finish block. Click on edit . Input values as shown below in the configuration screen and click Save.
Save the flow using the Save button on flow canvas.
The completed flow looks like below:

Check generated code

The flow is translated into Agama DSL. Click the Code button to see the generated code.


// Get authentication service class reference from the IDP
authServiceClass = Call io.jans.as.server.service.AuthenticationService#class 
// Get authentication service instance reference from the IDP
authService = Call io.jans.service.cdi.util.CdiUtil#bean authServiceClass
// Create empty object to store the authentication result
authResult = {}
// Retry 3 times to get the correct username and password 
Repeat 3 times max
    // Load login page for username and password input
    creds = RRF "login.ftlh" authResult
    // Validate username and password with IDP
    authResult.success = Call authService authenticate creds.username creds.password
    // Check if the authentication was successful 
    When authResult.success is true
          // Authentication successful. Return the username.
          Finish creds.username
// Max number of failed authentication attempts reached. return error and end the flow 
it_yrwmc = {success:false, error: "Maximum authentication attempts reached. Authentication failed."}
Finish it_yrwmc

Design user interface

In the RRF configuration step, we mentioned login.ftlh to render the login page elements. We need to add login.ftlh to the Agama project so that the flow can use it during the execution. Use the steps below to create the page.

Create a template file

On the left project explorer menu, click on web > New > Freemarker Template
Select + Create under the New Blank Template
Give Name and Description as shown below and click Create

Use the visual editor

This opens a visual editor to create an Apache FreeMarker template. Use this visual editor to create a template as per the need. For this article, we will use the code below.
Click Edit HTML. This opens a text editor. Remove existing code in the editor and paste the code shown below.

				
					
<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Username_Password_Form
        </title>
        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/tailwindcss@2.2/dist/tailwind.min.css" type="text/css">
    </head>
    <body>
        <div class="md:h-screen bg-white relative flex flex-col justify-center items-center">
            <div class="md:border md:border-gray-300 bg-white md:shadow-lg shadow-none rounded p-10 align-middle">
                <div class="flex flex-col items-center space-y-3">
                    <div class="flex">
                        <img decoding="async" src="https://gluu.org/wp-content/uploads/2020/12/logo.png" id="i4xwu">
                    </div>
                    <span class="text-2xl font-semi-bold leading-normal">Form</span>
                    <p class="leading-normal">Enter your Username and Password
                    </p>
                </div>
                <form method="post" class="my-8">
                    <div class="relative mb-2">
                        <label for="username" class="label mt-2 ml-1 leading-tighter text-gray-600 text-base cursor-text">
                            Username
                        </label>
                        <input type="text" id="username" name="username" autofocus="" required="" class="w-full rounded px-3 border border-gray-300 pt-2 pb-2 focus:border-green-700">
                    </div>
                    <div class="relative mb-2">
                        <label for="password" class="label mt-2 ml-1 leading-tighter text-gray-600 text-base cursor-text">
                            Password
                        </label>
                        <input type="password" id="password" name="password" autofocus="" required="" class="w-full rounded px-3 border border-gray-300 pt-2 pb-2 focus:border-green-700">
                    </div>
                    <div class="space-y-9">
                        <div class="text-sm flex justify-center items-center">
                            <button type="submit" class="py-2 px-6 rounded text-white btn bg-green-500 hover:bg-green-600">
                                Submit
                            </button>
                        </div>
                    </div>
                </form>
            </div>
        </div>
    </body>
</html>

Click Save changes
This will render the page in the visual editor.

Publish the project

At this point we have all the components of an Agama project ready, and they are stored in the development repository. Next step is to publish the project into the release repository. Publishing will create the first release of this project in the release repository. Artifacts linked to the release in the release repository contain the .gama package. This .gama package is used to deploy the project in the IDP.

To publish the project, click on any of the files in the left project explorer, and click Publish Project.

Enter a desired version number for the first release and the web link to the GitHub release repository. Click Publish

Upon successful publishing, the Agama Lab’s Releases dashboard is shown. It lists the project that we released.

Click on the project name to go to the GitHub repository release page where .gama file has been released

Download the .gama file from here to deploy on to the Janssen Server.

Deploy Agama project

Download the .gama file on the Janssen Server.
Open Janssen Server TUI and upload the .gama package using these instructions
Ensure that the project has been uploaded without any errors by refreshing the project listing after the upload.

Testing using Janssen Tarp

We will use the Jans Tarp, a browser extension based tool from the Janssen Project, to test this Agama project.

Install Jans Tarp browser plug-in
Follow these instructions to test using Jans Tarp. Remember that the ACR value is the composed of fully qualified name of your flow (in our case co.acme.password) preceded by agama_. That is agama_co.acme.password.
In a successful test run, the browser should prompt user for the user-name and password using the same user-interface that we built in the previous steps.