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Adding an Application Creation Workflow
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Adding an Application Creation Workflow

Apr 06, 2017

This section explains how to attach a custom workflow to the application creation operation in the API Manager. First, see Workflow Extensions for information on different types of workflow executors.

Before you begin, if you have changed the API Manager's default user and role, make sure you do the following changes:

  • Change the credentials of the workflow configurations in the registry resource _system/governance/apimgt/applicationdata/workflow-extensions.xml.

  • Point the database that has the API Manager user permissions to BPS.

  • Share any LDAPs, if exist.

  • Unzip the <API-M>/business-processes/application-creation/HumanTask/ApplicationsApprovalTask-1.0.0.zip file, update the role as follows in the ApplicationsApprovalTask.ht file, and ZIP the ApplicationsApprovalTask-1.0.0 folder.

  • Change the allowedRoles parameter in the <APIM_HOME>/repository/deployment/server/jaggeryapps/admin/site/conf/site.json file.

Configuring the Business Process Server

  1. Download WSO2 Business Process Server.

  2. Set an offset of 2 to the default BPS port in <BPS_HOME>/repository/conf/carbon.xml file. This prevents port conflicts that occur when you start more than one WSO2 product on the same server. Also see Changing the Default Ports with Offset. 

    <Offset>2</Offset>

  3. Open the <BPS_HOME>/repository/conf/humantask.xml file and <BPS_HOME>/repository/conf/b4p-coordination-config.xml file and set the TaskCoordinationEnabled property to true.

    <TaskCoordinationEnabled>true</TaskCoordinationEnabled>

  4. Copy the following from the <APIM_HOME>/business-processes/epr folder to the <BPS_HOME>/repository/conf/epr folder. If the <BPS_HOME>/repository/conf/epr folder does not exist, create it. 

    • ApplicationService.epr

    • ApplicationCallbackService.epr

  5. Start the BPS server and log in to its management console (https://<Server Host>:9443+<port offset>/carbon).   

  6. Select Processes > Add and upload the <APIM_HOME>/business-processes/application-creation/BPEL/ApplicationApprovalWorkFlowProcess_1.0.0.zip file to BPS. This is the business process archive file.

  7. Select Add under the Human Tasks menu and upload the <APIM_HOME>/business-processes/application-creation/HumanTask/ApplicationsApprovalTask-1.0.0.zip file to BPS. This is the human task archived file.

Configuring the API Manager

Open the <APIM_HOME>/repository/deployment/server/jaggeryapps/admin/site/conf/site.json file and configure "workFlowServerURL" under "workflows" to point to the BPS server (e.g. "workFlowServerURL": "https://localhost:9445/services/")

Engaging the WS Workflow Executor in the API Manager

First, enable the application creation workflow.

  1. Log in to APIM management console (https://<Server Host>:9443/carbon) and select Browse under Resources.

  2. Go to the /_system/governance/apimgt/applicationdata/workflow-extensions.xml resource, disable the Simple Workflow Executor and enable WS Workflow Executor. Also specify the service endpoint where the workflow engine is hosted and the credentials required to access the said service via basic authentication (i.e., username/password based authentication).

    <WorkFlowExtensions> ... <ApplicationCreation executor="org.wso2.carbon.apimgt.impl.workflow.ApplicationCreationWSWorkflowExecutor"> <Property name="serviceEndpoint">http://localhost:9765/services/ApplicationApprovalWorkFlowProcess/</Property> <Property name="username">admin</Property> <Property name="password">admin</Property> <Property name="callbackURL">https://localhost:8243/services/WorkflowCallbackService</Property> </ApplicationCreation> ...  </WorkFlowExtensions>

    The application creation WS Workflow Executor is now engaged.

  3. Go to the API Store, click Applications and create a new application.
    It invokes the application creation process and creates a Human Task instance that holds the execution of the BPEL process until some action is performed on it.    

  4. Note the message that appears if the BPEL is invoked correctly, saying that the request is successfully submitted. 

  5. Log in to the Admin Portal (https://localhost:9443/admin), list all the tasks for application creation and approve the task. It resumes the BPEL process and completes the application creation.

  6. Go back to the Applications page on the API Store and see the created application. 

    Whenever a user tries to create an application in the API Store, a request is sent to the workflow endpoint. Given below is a sample:

    <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:wor="http://workflow.subscription.apimgt.carbon.wso2.org"> <soapenv:Header /> <soapenv:Body> <wor:createApplication xmlns:wor="http://workflow.application.apimgt.carbon.wso2.org"> <wor:applicationName>application1</wor:applicationName> <wor:applicationTier>Gold</wor:applicationTier> <wor:applicationCallbackUrl>http://webapp/url</wor:applicationCallbackUrl> <wor:applicationDescription>Application 1</wor:applicationDescription> <wor:tenantDomain>wso2.com</wor:tenantDomain> <wor:userName>user1</wor:userName> <wor:workflowExternalRef>c0aad878-278c-4439-8d7e-712ee71d3f1c</wor:workflowExternalRef> <wor:callBackURL>https://localhost:8243/services/WorkflowCallbackService</wor:callBackURL> </wor:createApplication> </soapenv:Body> </soapenv:Envelope>

    Elements of the above configuration are described below:

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