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Adding an Approval Workflow

After adding the applicationState field, Delectable Bonsai wants to implement a workflow for reviewing and approving changes made to applications. Currently, all updates to an application are approved automatically, regardless of the selected state. Since Delectable Bonsai associates additional business logic with the approved and denied states, the workflow must check the applicationState field and require manager review if one of these values is selected. Here you’ll deploy and set up this workflow process using Liferay client extensions.

Deploying the Client Extensions

Download and unzip the sample workspace:

curl -o https://resources.learn.liferay.com/courses/latest/en/application-development/implementing-business-logic/liferay-c6s3.zip

unzip liferay-c6s3.zip

Navigate to liferay-c6s3/liferay-course-workspace/client-extensions:
```
cd liferay-c6s3/liferay-course-workspace/client-extensions
```
This includes two client extension projects: liferay-course-batch and liferay-course-etc-spring-boot.

Run this command to deploy the client extensions and confirm the deployment in your Liferay instance’s console:

../gradlew clean deploy -Ddeploy.docker.container.id=$(docker ps -lq)

2023-07-20 21:03:07.142 INFO  [Refresh Thread: Equinox Container: 8b6a806c-654e-44f8-8210-75b61d29063c][BundleStartStopLogger:77] STARTED liferaycoursebatch_1.0.0 [1721]
2023-07-20 21:03:12.408 INFO  [Refresh Thread: Equinox Container: 8b6a806c-654e-44f8-8210-75b61d29063c][BundleStartStopLogger:77] STARTED liferaycourseetcspringboot_1.0.0 [1722]

Navigate to the liferay-course-etc-spring-boot project and start the Spring Boot application:
```
cd liferay-course-etc-spring-boot
```
```
./../../gradlew bootRun
```
When the application starts, go to http://localhost:58081/ready. If the application is ready for use, the page says “READY.”

Now you can enable the workflow for the Distributor Application object.

Examining the Code

The provided Workflow Action client extension performs these operations:

Retrieves the application’s state value and uses it to determine the workflow transition
Makes an asynchronous HTTP POST request for the transition

Determining the Workflow Transition

   @PostMapping
   public ResponseEntity<String> post(
      @AuthenticationPrincipal Jwt jwt, @RequestBody String json) {

      log(jwt, _log, json);

      String transition = "auto-approve";

      JSONObject payload = new JSONObject(json);

      JSONObject entryDTO = payload.getJSONObject("entryDTO");

      JSONObject applicationState = entryDTO.getJSONObject("applicationState");

      String applicationStateKey = applicationState.getString("key");

      if (Objects.equals("approved", applicationStateKey) || Objects.equals("denied", applicationStateKey)) {
         transition = "review";
      }
      ...
   }

The post method for WorkflowAction1RestController has two parameters: the JSON Web Token (JWT) and the request body. The token authenticates HTTP calls, and the request body contains data as a string in JSON format.

After logging the request body, the code initializes the transition variable and sets its value to auto-approve.

It then uses the JSONObject() constructor and .getJSONObject() method to extract the key value for the applicationState field and stores the key in the applicationStateKey variable.

Finally, it defines a conditional block that updates the transition variable to review if the state key equals approved or denied.

Making the POST Request

      try {
         WebClient.Builder builder = WebClient.builder();

         WebClient webClient = builder.baseUrl(
            lxcDXPServerProtocol + "://" + lxcDXPMainDomain
         ).defaultHeader(
            HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE
         ).defaultHeader(
            HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE
         ).build();

         webClient.post(
         ).uri(
            payload.getString("transitionURL")
         ).bodyValue(
            "{\"transitionName\": \"" + transition + "\"}"
         ).header(
            HttpHeaders.AUTHORIZATION, "Bearer " + jwt.getTokenValue()
         ).exchangeToMono(
            clientResponse -> {
               HttpStatus httpStatus = clientResponse.statusCode();

               if (httpStatus.is2xxSuccessful()) {
                  return clientResponse.bodyToMono(String.class);
               }
               else if (httpStatus.is4xxClientError()) {
                  return Mono.just(httpStatus.getReasonPhrase());
               }

               Mono<WebClientResponseException> mono =
                  clientResponse.createException();

               return mono.flatMap(Mono::error);
            }
         ).doOnNext(
            output -> {
               if (_log.isInfoEnabled()) {
                  _log.info("Output: " + output);
               }
            }
         ).subscribe();
      }

After determining the workflow transition, the code proceeds to make an asynchronous HTTP POST request. First, it initializes and configures the WebClient, determining its base URL and header, and then it calls the post() method on the WebClient.

This POST request uses the transitionURL value from the original response body for its uri(). It then uses bodyValue() to update the workflow task’s transitionName with the transition variable’s value. The request is authenticated using the JWT and logged according to the response’s HTTP status code.

Enabling the Workflow for Distributor Application

Open the Global Menu (), go to the Applications tab, and click Process Builder.
Confirm the Machine Approver process appears.

This process was added by the batch client extension and defines five nodes: Start, Machine Review, Manager Review, Update, and Approved.

The Machine Review node uses the workflow action client extension to check each application’s state field. If the value equals approved or denied, the application is directed to the Manager Review node for approval by a Business Development Manager. Otherwise, the Machine Review node automatically directs the application to the Approved node.
Go to the Configuration tab.
Click Edit for Distributor Application, select Machine Approver, and click Save.

Testing the Workflow

Open Distributor Applications and begin editing an entry.
Set the state to Under Review and click Save.
Check the entry’s status. It should be Approved.
Change the entry’s state to Approved.
Check the entry’s status. It should be Pending.
Open the Personal Menu, go to Notifications, and click the new workflow notification.
Assign the review task to yourself and approve it.
Check the entry’s status. It should be Approved.