feat: workload generator support create contentFrom based file

go.mod

@@ -289,7 +289,7 @@ require (
 	google.golang.org/protobuf v1.31.0
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
-	k8s.io/klog/v2 v2.100.1
+	k8s.io/klog/v2 v2.100.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f // indirect
 	lukechampine.com/frand v1.4.2 // indirect
 	oras.land/oras-go v1.2.3 // indirect

pkg/modules/generators/workload/workload_generator.go

@@ -3,6 +3,7 @@ package workload
 import (
 	"fmt"
 	"net/url"
+	"path"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -350,7 +351,6 @@ func handleFileCreation(c container.Container, uniqueAppName, containerName stri
 ) {
 	var idx int
 	err = modules.ForeachOrdered(c.Files, func(k string, v container.FileSpec) error {
-		// for k, v := range c.Files {
 		// The declared file path needs to include the file name.
 		if filepath.Base(k) == "." || filepath.Base(k) == "/" {
 			return fmt.Errorf("the declared file path needs to include the file name")
@@ -369,8 +369,26 @@ func handleFileCreation(c container.Container, uniqueAppName, containerName stri
 		}
 
 		if v.ContentFrom != "" {
-			// TODO: support the creation of the file content from a reference source.
-			panic("not supported the creation the file content from a reference source")
+			sec, ok, err := parseSecretReference(v.ContentFrom)
+			if err != nil || !ok {
+				return fmt.Errorf("invalid content from str")
+			}
+
+			volumes = append(volumes, corev1.Volume{
+				Name: sec.Name,
+				VolumeSource: corev1.VolumeSource{
+					Secret: &corev1.SecretVolumeSource{
+						SecretName:  sec.Name,
+						DefaultMode: &modeInt32,
+					},
+				},
+			})
+
+			volumeMounts = append(volumeMounts, corev1.VolumeMount{
+				Name:      sec.Name,
+				MountPath: path.Join("/", k),
+				SubPath:   sec.Key,
+			})
 		} else if v.Content != "" {
 			// Create the file content with configMap.
 			data := make(map[string]string)
@@ -440,3 +458,31 @@ func completeBaseWorkload(base *workload.Base, config apiv1.GenericConfig) error
 	}
 	return nil
 }
+
+type secretReference struct {
+	Name string
+	Key  string
+}
+
+// parseSecretReference takes secret reference string as parameter and returns secretReference obj.
+// Parameter `ref` is expected in following format: secret://sec-name/key, if the provided ref str
+// is not in valid format, this function will return false or err.
+func parseSecretReference(ref string) (result secretReference, _ bool, _ error) {
+	if strings.HasPrefix(ref, "${secret://") && strings.HasSuffix(ref, "}") {
+		ref = ref[2 : len(ref)-1]
+	}
+
+	if !strings.HasPrefix(ref, "secret://") {
+		return result, false, nil
+	}
+
+	u, err := url.Parse(ref)
+	if err != nil {
+		return result, false, err
+	}
+
+	result.Name = u.Host
+	result.Key, _, _ = strings.Cut(strings.TrimPrefix(u.Path, "/"), "/")
+
+	return result, true, nil
+}

pkg/modules/generators/workload/workload_generator_test.go

@@ -134,6 +134,58 @@ func TestWorkloadGenerator_Generate(t *testing.T) {
 	}
 }
 
+func TestGenerate(t *testing.T) {
+	testCases := []struct {
+		name        string
+		project     string
+		stack       string
+		application string
+		workload    *workload.Workload
+	}{
+		{
+			name:        "simple service workload",
+			project:     "helloworld",
+			stack:       "dev",
+			application: "nginx",
+			workload: &workload.Workload{
+				Header: workload.Header{
+					Type: workload.TypeService,
+				},
+				Service: &workload.Service{
+					Base: workload.Base{
+						Containers: map[string]container.Container{
+							"main": {
+								Image: "nginx:latest",
+								Files: map[string]container.FileSpec{
+									"/run/secret/password": {
+										ContentFrom: "secret://sec-name/key?mode=0400",
+										Mode:        "0644",
+									},
+								},
+							},
+						},
+					},
+					Type: workload.Deployment,
+				},
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			g := &Generator{
+				Project:  tc.project,
+				Stack:    tc.stack,
+				App:      tc.application,
+				Workload: tc.workload,
+			}
+			spec := &apiv1.Intent{}
+			err := g.Generate(spec)
+			assert.NoError(t, err, "Error should be nil")
+		})
+	}
+}
+
 func TestToOrderedContainers(t *testing.T) {
 	t.Run("toOrderedContainers should convert app containers to ordered containers", func(t *testing.T) {
 		appContainers := make(map[string]container.Container)