initial commit [ci skip]

engine/resource/parser.go

@@ -0,0 +1,54 @@
+// Copyright 2019 Drone.IO Inc. All rights reserved.
+// Use of this source code is governed by the Polyform License
+// that can be found in the LICENSE file.
+
+package resource
+
+import (
+	"errors"
+
+	"github.com/drone/runner-go/manifest"
+
+	"github.com/buildkite/yaml"
+)
+
+func init() {
+	manifest.Register(parse)
+}
+
+// parse parses the raw resource and returns an Exec pipeline.
+func parse(r *manifest.RawResource) (manifest.Resource, bool, error) {
+	if !match(r) {
+		return nil, false, nil
+	}
+	out := new(Pipeline)
+	err := yaml.Unmarshal(r.Data, out)
+	if err != nil {
+		return out, true, err
+	}
+	err = lint(out)
+	return out, true, err
+}
+
+// match returns true if the resource matches the kind and type.
+func match(r *manifest.RawResource) bool {
+	return r.Kind == Kind && r.Type == Type
+}
+
+func lint(pipeline *Pipeline) error {
+	// ensure pipeline steps are not unique.
+	names := map[string]struct{}{}
+	for _, step := range pipeline.Steps {
+		if step.Name == "" {
+			return errors.New("Linter: invalid or missing step name")
+		}
+		if len(step.Name) > 100 {
+			return errors.New("Linter: step name cannot exceed 100 characters")
+		}
+		if _, ok := names[step.Name]; ok {
+			return errors.New("Linter: duplicate step name")
+		}
+		names[step.Name] = struct{}{}
+	}
+	return nil
+}