Fix StepAction support in Cluster resolver

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

docs/cluster-resolver.md

@@ -13,11 +13,11 @@ This Resolver responds to type `cluster`.
 
 ## Parameters
 
-| Param Name  | Description                                           | Example Value                |
-|-------------|-------------------------------------------------------|------------------------------|
-| `kind`      | The kind of resource to fetch.                        | `task`, `pipeline`           |
-| `name`      | The name of the resource to fetch.                    | `some-pipeline`, `some-task` |
-| `namespace` | The namespace in the cluster containing the resource. | `default`, `other-namespace` |
+| Param Name  | Description                                           | Example Value                    |
+|-------------|-------------------------------------------------------|----------------------------------|
+| `kind`      | The kind of resource to fetch.                        | `task`, `pipeline`, `stepaction` |
+| `name`      | The name of the resource to fetch.                    | `some-pipeline`, `some-task`     |
+| `namespace` | The namespace in the cluster containing the resource. | `default`, `other-namespace`     |
 
 ## Requirements
 
@@ -37,7 +37,7 @@ for the name, namespace and defaults that the resolver ships with.
 
 | Option Name          | Description                                                                                                                                         | Example Values                     |
 |----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------|
-| `default-kind`       | The default resource kind to fetch if not specified in parameters.                                                                                  | `task`, `pipeline`                 |
+| `default-kind`       | The default resource kind to fetch if not specified in parameters.                                                                                  | `task`, `pipeline`, `stepaction`   |
 | `default-namespace`  | The default namespace to fetch resources from if not specified in parameters.                                                                       | `default`, `some-namespace`        |
 | `allowed-namespaces` | An optional comma-separated list of namespaces which the resolver is allowed to access. Defaults to empty, meaning all namespaces are allowed.      | `default,some-namespace`, (empty)  |
 | `blocked-namespaces` | An optional comma-separated list of namespaces which the resolver is blocked from accessing. If the value is a `*` all namespaces will be disallowed and allowed namespace will need to be explicitely listed in `allowed-namespaces`. Defaults to empty, meaning all namespaces are allowed. | `default,other-namespace`, `*`, (empty) |
@@ -63,6 +63,27 @@ spec:
       value: namespace-containing-task
 ```
 
+### StepAction Resolution
+
+```yaml
+apiVersion: tekton.dev/v1beta1
+kind: Task
+metadata:
+  name: remote-stepaction-reference
+spec:
+  steps:
+  - name: step-action-example
+    ref
+      resolver: cluster
+      params:
+      - name: kind
+        value: stepaction
+      - name: name
+        value: some-stepaction
+      - name: namespace
+        value: namespace-containing-stepaction
+```
+
 ### Pipeline resolution
 
 ```yaml

pkg/resolution/resolver/cluster/resolver.go

@@ -21,6 +21,7 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
+	"slices"
 	"strings"
 
 	resolverconfig "github.com/tektoncd/pipeline/pkg/apis/config/resolver"
@@ -51,6 +52,8 @@ const (
 
 var _ framework.Resolver = &Resolver{}
 
+var supportedKinds = []string{"task", "pipeline", "stepaction"}
+
 // Resolver implements a framework.Resolver that can fetch resources from other namespaces.
 //
 // Deprecated: Use [github.com/tektoncd/pipeline/pkg/remoteresolution/resolver/cluster.Resolver] instead.
@@ -229,7 +232,7 @@ func populateParamsWithDefaults(ctx context.Context, origParams []pipelinev1.Par
 	} else {
 		params[KindParam] = pKind.StringVal
 	}
-	if kindVal, ok := params[KindParam]; ok && kindVal != "task" && kindVal != "pipeline" {
+	if kindVal, ok := params[KindParam]; ok && !isSupportedKind(kindVal) {
 		return nil, fmt.Errorf("unknown or unsupported resource kind '%s'", kindVal)
 	}
 
@@ -364,3 +367,7 @@ func fetchPipeline(ctx context.Context, groupVersion string, pipeline *pipelinev
 	}
 	return uid, data, sha256Checksum, spec, nil
 }
+
+func isSupportedKind(kindValue string) bool {
+	return slices.Contains[[]string, string](supportedKinds, kindValue)
+}

pkg/resolution/resolver/cluster/resolver_test.go

@@ -279,6 +279,28 @@ func TestResolve(t *testing.T) {
 		t.Fatalf("couldn't marshal pipeline: %v", err)
 	}
 
+	exampleStepAction := &pipelinev1beta1.StepAction{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:            "example-stepaction",
+			Namespace:       "stepaction-ns",
+			ResourceVersion: "00003",
+			UID:             "c123",
+		},
+		TypeMeta: metav1.TypeMeta{
+			Kind:       "StepAction",
+			APIVersion: "tekton.dev/v1beta1",
+		},
+		Spec: pipelinev1beta1.StepActionSpec{},
+	}
+	stepActionChecksum, err := exampleStepAction.Checksum()
+	if err != nil {
+		t.Fatalf("couldn't checksum stepaction: %v", err)
+	}
+	stepActionAsYAML, err := yaml.Marshal(exampleStepAction)
+	if err != nil {
+		t.Fatalf("couldn't marshal stepaction: %v", err)
+	}
+
 	testCases := []struct {
 		name              string
 		kind              string
@@ -323,6 +345,23 @@ func TestResolve(t *testing.T) {
 					},
 				},
 			},
+		}, {
+			name:         "successful stepaction",
+			kind:         "stepaction",
+			resourceName: exampleStepAction.Name,
+			namespace:    exampleStepAction.Namespace,
+			expectedStatus: &v1beta1.ResolutionRequestStatus{
+				Status: duckv1.Status{},
+				ResolutionRequestStatusFields: v1beta1.ResolutionRequestStatusFields{
+					Data: base64.StdEncoding.Strict().EncodeToString(stepActionAsYAML),
+					RefSource: &pipelinev1.RefSource{
+						URI: "/apis/tekton.dev/v1/namespaces/stepaction-ns/stepaction/example-stepaction@c123",
+						Digest: map[string]string{
+							"sha256": hex.EncodeToString(stepActionChecksum),
+						},
+					},
+				},
+			},
 		}, {
 			name:         "default namespace",
 			kind:         "pipeline",
@@ -427,6 +466,7 @@ func TestResolve(t *testing.T) {
 				Pipelines:          []*pipelinev1.Pipeline{examplePipeline},
 				ResolutionRequests: []*v1beta1.ResolutionRequest{request},
 				Tasks:              []*pipelinev1.Task{exampleTask},
+				StepActions:        []*pipelinev1beta1.StepAction{exampleStepAction},
 			}
 
 			resolver := &cluster.Resolver{}