Mapping `workflow_dispatch` inputs into the Expression `inputs` context (#1363)

* test: check workflow_dispatch inputs

This implements a test to check for `workflow_dispatch` inputs.
This will be a prerequisite for implementing the inputs.

* feat: map workflow_dispatch input to expression evaluator

This changes adds the workflow_dispatch event inputs
to the `inputs` context and maintaining the boolean type

* fix: coerce boolean input types

* fix: use step env if available, rc env otherwise

5 files changed, 136 insertions, 14 deletions

diff --git a/pkg/model/workflow.go b/pkg/model/workflow.go
index af71231..214927e 100644
--- a/pkg/model/workflow.go
+++ b/pkg/model/workflow.go
@@ -55,6 +55,51 @@ func (w *Workflow) On() []string {
 	return nil
 }
 
+func (w *Workflow) OnEvent(event string) interface{} {
+	if w.RawOn.Kind == yaml.MappingNode {
+		var val map[string]interface{}
+		err := w.RawOn.Decode(&val)
+		if err != nil {
+			log.Fatal(err)
+		}
+		return val[event]
+	}
+	return nil
+}
+
+type WorkflowDispatchInput struct {
+	Description string   `yaml:"description"`
+	Required    bool     `yaml:"required"`
+	Default     string   `yaml:"default"`
+	Type        string   `yaml:"type"`
+	Options     []string `yaml:"options"`
+}
+
+type WorkflowDispatch struct {
+	Inputs map[string]WorkflowDispatchInput `yaml:"inputs"`
+}
+
+func (w *Workflow) WorkflowDispatchConfig() *WorkflowDispatch {
+	if w.RawOn.Kind != yaml.MappingNode {
+		return nil
+	}
+
+	var val map[string]yaml.Node
+	err := w.RawOn.Decode(&val)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var config WorkflowDispatch
+	node := val["workflow_dispatch"]
+	err = node.Decode(&config)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	return &config
+}
+
 // Job is the structure of one job in a workflow
 type Job struct {
 	Name           string                    `yaml:"name"`
diff --git a/pkg/runner/expression.go b/pkg/runner/expression.go
index a0f0c9b..adba569 100644
--- a/pkg/runner/expression.go
+++ b/pkg/runner/expression.go
@@ -9,6 +9,7 @@ import (
 	"github.com/nektos/act/pkg/common"
 	"github.com/nektos/act/pkg/container"
 	"github.com/nektos/act/pkg/exprparser"
+	"github.com/nektos/act/pkg/model"
 	"gopkg.in/yaml.v3"
 )
 
@@ -39,15 +40,11 @@ func (rc *RunContext) NewExpressionEvaluator(ctx context.Context) ExpressionEval
 		}
 	}
 
-	inputs := make(map[string]interface{})
-	for k, v := range rc.GetEnv() {
-		if strings.HasPrefix(k, "INPUT_") {
-			inputs[strings.ToLower(strings.TrimPrefix(k, "INPUT_"))] = v
-		}
-	}
+	ghc := rc.getGithubContext(ctx)
+	inputs := getEvaluatorInputs(ctx, rc, nil, ghc)
 
 	ee := &exprparser.EvaluationEnvironment{
-		Github: rc.getGithubContext(ctx),
+		Github: ghc,
 		Env:    rc.GetEnv(),
 		Job:    rc.getJobContext(),
 		// todo: should be unavailable
@@ -94,12 +91,8 @@ func (rc *RunContext) NewStepExpressionEvaluator(ctx context.Context, step step)
 		}
 	}
 
-	inputs := make(map[string]interface{})
-	for k, v := range *step.getEnv() {
-		if strings.HasPrefix(k, "INPUT_") {
-			inputs[strings.ToLower(strings.TrimPrefix(k, "INPUT_"))] = v
-		}
-	}
+	ghc := rc.getGithubContext(ctx)
+	inputs := getEvaluatorInputs(ctx, rc, step, ghc)
 
 	ee := &exprparser.EvaluationEnvironment{
 		Github: step.getGithubContext(ctx),
@@ -319,3 +312,37 @@ func rewriteSubExpression(ctx context.Context, in string, forceFormat bool) (str
 	}
 	return out, nil
 }
+
+func getEvaluatorInputs(ctx context.Context, rc *RunContext, step step, ghc *model.GithubContext) map[string]interface{} {
+	inputs := map[string]interface{}{}
+
+	var env map[string]string
+	if step != nil {
+		env = *step.getEnv()
+	} else {
+		env = rc.GetEnv()
+	}
+
+	for k, v := range env {
+		if strings.HasPrefix(k, "INPUT_") {
+			inputs[strings.ToLower(strings.TrimPrefix(k, "INPUT_"))] = v
+		}
+	}
+
+	if ghc.EventName == "workflow_dispatch" {
+		config := rc.Run.Workflow.WorkflowDispatchConfig()
+		for k, v := range config.Inputs {
+			value := nestedMapLookup(ghc.Event, "inputs", k)
+			if value == nil {
+				value = v.Default
+			}
+			if v.Type == "boolean" {
+				inputs[k] = value == "true"
+			} else {
+				inputs[k] = value
+			}
+		}
+	}
+
+	return inputs
+}
diff --git a/pkg/runner/runner_test.go b/pkg/runner/runner_test.go
index f2610a1..dbf8a00 100644
--- a/pkg/runner/runner_test.go
+++ b/pkg/runner/runner_test.go
@@ -182,6 +182,7 @@ func TestRunEvent(t *testing.T) {
 		{workdir, "uses-action-with-pre-and-post-step", "push", "", platforms},
 		{workdir, "evalenv", "push", "", platforms},
 		{workdir, "ensure-post-steps", "push", "Job 'second-post-step-should-fail' failed", platforms},
+		{workdir, "workflow_dispatch", "workflow_dispatch", "", platforms},
 		{"../model/testdata", "strategy", "push", "", platforms}, // TODO: move all testdata into pkg so we can validate it with planner and runner
 		// {"testdata", "issue-228", "push", "", platforms, }, // TODO [igni]: Remove this once everything passes
 		{"../model/testdata", "container-volumes", "push", "", platforms},
@@ -189,7 +190,14 @@ func TestRunEvent(t *testing.T) {
 
 	for _, table := range tables {
 		t.Run(table.workflowPath, func(t *testing.T) {
-			table.runTest(ctx, t, &Config{})
+			config := &Config{}
+
+			eventFile := filepath.Join(workdir, table.workflowPath, "event.json")
+			if _, err := os.Stat(eventFile); err == nil {
+				config.EventPath = eventFile
+			}
+
+			table.runTest(ctx, t, config)
 		})
 	}
 }
diff --git a/pkg/runner/testdata/workflow_dispatch/event.json b/pkg/runner/testdata/workflow_dispatch/event.json
new file mode 100644
index 0000000..d3ecab1
--- /dev/null
+++ b/pkg/runner/testdata/workflow_dispatch/event.json
@@ -0,0 +1,6 @@
+{
+  "inputs": {
+    "required": "required input",
+    "boolean": "true"
+  }
+}
diff --git a/pkg/runner/testdata/workflow_dispatch/workflow_dispatch.yml b/pkg/runner/testdata/workflow_dispatch/workflow_dispatch.yml
new file mode 100644
index 0000000..db12548
--- /dev/null
+++ b/pkg/runner/testdata/workflow_dispatch/workflow_dispatch.yml
@@ -0,0 +1,36 @@
+name: workflow_dispatch
+
+on:
+  workflow_dispatch:
+    inputs:
+      required:
+        description: a required input
+        required: true
+      with_default:
+        description: an input with default
+        required: false
+        default: default
+      boolean:
+        description: an input of type boolean
+        required: false
+        type: boolean
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: test required input
+        run: |
+          echo input.required=${{ inputs.required }}
+          [[ "${{ inputs.required }}" = "required input" ]] || exit 1
+      - name: test input with default
+        run: |
+          echo input.with_default=${{ inputs.with_default }}
+          [[ "${{ inputs.with_default }}" = "default" ]] || exit 1
+      - id: boolean-test
+        name: run on boolean input
+        if: ${{ inputs.boolean == true }}
+        run: echo "::set-output name=value::executed"
+      - name: has boolean test?
+        run: |
+          [[ "${{ steps.boolean-test.outputs.value }}" = "executed" ]] || exit 1