Add public artifact reader support

artifact_reader_internal_test.go

@@ -0,0 +1,36 @@
+package scriptorium
+
+import (
+	"context"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/scriptorium/internal/domain"
+)
+
+func TestPublicArtifactReaderAdapterCopiesBody(t *testing.T) {
+	reader := internalArtifactReaderFake{
+		artifact: &Artifact{Body: []byte("original")},
+	}
+	adapter := publicArtifactReaderAdapter{reader: &reader}
+
+	artifact, err := adapter.Read(context.Background(), domain.ArtifactRef{
+		Type: domain.ArtifactRefInline,
+		URI:  "memory://input",
+		Body: "input",
+	})
+	if err != nil {
+		t.Fatalf("read artifact: %v", err)
+	}
+	artifact.Body[0] = 'X'
+	if got := string(reader.artifact.Body); got != "original" {
+		t.Fatalf("reader artifact body was mutated: %q", got)
+	}
+}
+
+type internalArtifactReaderFake struct {
+	artifact *Artifact
+}
+
+func (r *internalArtifactReaderFake) Read(context.Context, ArtifactRef) (*Artifact, error) {
+	return r.artifact, nil
+}