nuclei/v2/pkg/workflows/execute.go

package workflows

import (
	"github.com/projectdiscovery/nuclei/v2/pkg/output"
	"go.uber.org/atomic"
)

// RunWorkflow runs a workflow on an input and returns true or false
func (w *Workflow) RunWorkflow(input string) (bool, error) {
	results := &atomic.Bool{}

	for _, template := range w.Workflows {
		err := w.runWorkflowStep(template, input, results)
		if err != nil {
			return results.Load(), err
		}
	}
	return results.Load(), nil
}

// runWorkflowStep runs a workflow step for the workflow. It executes the workflow
// in a recursive manner running all subtemplates and matchers.
func (w *Workflow) runWorkflowStep(template *WorkflowTemplate, input string, results *atomic.Bool) error {
	var firstMatched bool
	if len(template.Matchers) == 0 {
		w.options.Progress.AddToTotal(int64(template.Executer.Requests()))

		matched, err := template.Executer.Execute(input)
		if err != nil {
			return err
		}
		if matched {
			firstMatched = matched
			results.CAS(false, matched)
		}
	}

	if len(template.Matchers) > 0 {
		w.options.Progress.AddToTotal(int64(template.Executer.Requests()))

		var executionErr error
		err := template.Executer.ExecuteWithResults(input, func(event *output.InternalWrappedEvent) {
			if event.OperatorsResult == nil {
				return
			}

			for _, matcher := range template.Matchers {
				_, matchOK := event.OperatorsResult.Matches[matcher.Name]
				_, extractOK := event.OperatorsResult.Extracts[matcher.Name]
				if !matchOK && !extractOK {
					continue
				}

				for _, subtemplate := range matcher.Subtemplates {
					if err := w.runWorkflowStep(subtemplate, input, results); err != nil {
						executionErr = err
						break
					}
				}
			}
		})
		if err != nil {
			return err
		}
		if executionErr != nil {
			return executionErr
		}
		return nil
	}
	if len(template.Subtemplates) > 0 && firstMatched {
		for _, subtemplate := range template.Subtemplates {
			if err := w.runWorkflowStep(subtemplate, input, results); err != nil {
				return err
			}
		}
	}
	return nil
}