flowable 获取流程启动事件表单信息

@ApiOperation(value = "Get a process definition start form", tags = { "Process Definitions" })
@ApiResponses(value = {
        @ApiResponse(code = 200, message = "Indicates request was successful and the process definition form is returned"),
        @ApiResponse(code = 404, message = "Indicates the requested process definition was not found.")
})
@GetMapping(value = "/repository/process-definitions/{processDefinitionId}/start-form", produces = "application/json")
public String getProcessDefinitionStartForm(@ApiParam(name = "processDefinitionId") @PathVariable String processDefinitionId, HttpServletRequest request) {
    if (formRepositoryService == null) {
        return null;
    }    
    ProcessDefinition processDefinition = getProcessDefinitionFromRequest(processDefinitionId);
    FormInfo formInfo = getStartForm(processDefinition);
    if (formHandlerRestApiInterceptor != null) {
        return formHandlerRestApiInterceptor.convertStartFormInfo(formInfo, processDefinition);
    } else {
        SimpleFormModel formModel = (SimpleFormModel) formInfo.getFormModel();
        return restResponseFactory.getFormModelString(new FormModelResponse(formInfo, formModel));
    }
}
protected FormInfo getStartForm(ProcessDefinition processDefinition) {
    FormInfo formInfo = null;
    BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinition.getId());
    Process process = bpmnModel.getProcessById(processDefinition.getKey());
    FlowElement startElement = process.getInitialFlowElement();
    if (startElement instanceof StartEvent) {
        StartEvent startEvent = (StartEvent) startElement;
        if (StringUtils.isNotEmpty(startEvent.getFormKey())) {
            if (startEvent.isSameDeployment()) {
                Deployment deployment = repositoryService.createDeploymentQuery().deploymentId(processDefinition.getDeploymentId()).singleResult();
                formInfo = formRepositoryService.getFormModelByKeyAndParentDeploymentId(startEvent.getFormKey(),
                                deployment.getParentDeploymentId(), processDefinition.getTenantId(), processEngineConfiguration.isFallbackToDefaultTenant());
            } else {
                formInfo = formRepositoryService.getFormModelByKey(startEvent.getFormKey(), processDefinition.getTenantId(),
                        processEngineConfiguration.isFallbackToDefaultTenant());
            }
        }
    }
    if (formInfo == null) {
        // Definition found, but no form attached
        throw new FlowableObjectNotFoundException("Process definition does not have a form defined: " + processDefinition.getId());
    }    
    return formInfo;
}

@RestController
@RequestMapping("/app")
public class ProcessDefinitionResource {

    @Autowired
    protected FlowableProcessDefinitionService processDefinitionService;

    @GetMapping(value = "/rest/process-definitions/{processDefinitionId}/start-form", produces = "application/json")
    public FormModelRepresentation getProcessDefinitionStartForm(@PathVariable String processDefinitionId) {
        FormInfo formInfo = processDefinitionService.getProcessDefinitionStartForm(processDefinitionId);
        SimpleFormModel formModel = (SimpleFormModel) formInfo.getFormModel();
        return new FormModelRepresentation(formInfo, formModel);
    }
}

public FormInfo getProcessDefinitionStartForm(String processDefinitionId) {
    ProcessDefinition processDefinition = repositoryService.getProcessDefinition(processDefinitionId);
    try {
        return getStartForm(processDefinition);
    } catch (FlowableObjectNotFoundException aonfe) {
        // Process definition does not exist
        throw new NotFoundException("No process definition found with the given id: " + processDefinitionId);
    }
}
protected FormInfo getStartForm(ProcessDefinition processDefinition) {
    FormInfo formInfo = null;
    BpmnModel bpmnModel = repositoryService.getBpmnModel(processDefinition.getId());
    Process process = bpmnModel.getProcessById(processDefinition.getKey());
    FlowElement startElement = process.getInitialFlowElement();
    if (startElement instanceof StartEvent) {
        StartEvent startEvent = (StartEvent) startElement;
        if (StringUtils.isNotEmpty(startEvent.getFormKey())) {
            Deployment deployment = repositoryService.createDeploymentQuery().deploymentId(processDefinition.getDeploymentId()).singleResult();
            formInfo = formRepositoryService.getFormModelByKeyAndParentDeploymentId(startEvent.getFormKey(), deployment.getParentDeploymentId(), 
                            processDefinition.getTenantId(), processEngineConfiguration.isFallbackToDefaultTenant());
        }
    }
    if (formInfo == null) {
        // Definition found, but no form attached
        throw new NotFoundException("Process definition does not have a form defined: " + processDefinition.getId());
    }
    return formInfo;
}