Fix run artifact package download names

platform/service/artifact_download.go

@@ -39,12 +39,13 @@ func (svc *CoreService) OpenArtifactDownloadForSession(sessionID string, request
 		return domain.ArtifactDownloadReference{}, validationError("artifact must be available before download")
 	}
 
+	filename, contentType := svc.artifactDownloadPresentation(artifact)
 	reference := domain.ArtifactDownloadReference{
 		ArtifactID:      artifact.ID,
 		OwnerKind:       artifact.OwnerKind,
 		OwnerID:         artifact.OwnerID,
-		Filename:        artifactDownloadFilename(artifact.ID),
-		ContentType:     "application/octet-stream",
+		Filename:        filename,
+		ContentType:     contentType,
 		SizeBytes:       artifact.SizeBytes,
 		Checksum:        artifact.Checksum,
 		State:           artifact.State,
@@ -98,10 +99,11 @@ func (svc *CoreService) ReadArtifactContentForSession(sessionID string, request
 	}
 	end := int(request.Offset) + limit
 	part := domain.CopyBytes(payload[int(request.Offset):end])
+	filename, contentType := svc.artifactDownloadPresentation(artifact)
 	content := domain.ArtifactContent{
 		ArtifactID:      artifact.ID,
-		Filename:        artifactDownloadFilename(artifact.ID),
-		ContentType:     "application/octet-stream",
+		Filename:        filename,
+		ContentType:     contentType,
 		Offset:          request.Offset,
 		SizeBytes:       int64(len(part)),
 		TotalSizeBytes:  artifact.SizeBytes,
@@ -205,3 +207,62 @@ func artifactDownloadFilename(artifactID string) string {
 	}
 	return fmt.Sprintf("%s.bin", name)
 }
+
+func (svc *CoreService) artifactDownloadPresentation(artifact domain.Artifact) (string, string) {
+	if filename, contentType, ok := svc.distributionArtifactDownloadPresentation(artifact.ID); ok {
+		return filename, contentType
+	}
+	return artifactDownloadFilename(artifact.ID), "application/octet-stream"
+}
+
+func (svc *CoreService) distributionArtifactDownloadPresentation(artifactID string) (string, string, bool) {
+	runs, err := svc.store.RunDistributions().List(domain.RunDistributionFilter{})
+	if err == nil {
+		for _, distribution := range runs {
+			if distribution.ArtifactID == artifactID {
+				return distributionPackageFilename("run", distribution.TargetOS, distribution.TargetArch, distribution.PackageFormat), packageContentType(distribution.PackageFormat), true
+			}
+		}
+	}
+	clients, err := svc.store.ClientManagerDistributions().List(domain.ClientManagerDistributionFilter{})
+	if err == nil {
+		for _, distribution := range clients {
+			if distribution.ArtifactID == artifactID {
+				format := packageFormatForTarget(distribution.TargetOS)
+				return distributionPackageFilename(distribution.ProfileKey, distribution.TargetOS, distribution.TargetArch, format), packageContentType(format), true
+			}
+		}
+	}
+	return "", "", false
+}
+
+func distributionPackageFilename(base string, targetOS string, targetArch string, packageFormat string) string {
+	name := sanitizeIDPart(base)
+	os := sanitizeIDPart(targetOS)
+	arch := sanitizeIDPart(targetArch)
+	format := strings.TrimPrefix(strings.TrimSpace(packageFormat), ".")
+	if name == "" {
+		name = "artifact"
+	}
+	if os != "" {
+		name += "-" + os
+	}
+	if arch != "" {
+		name += "-" + arch
+	}
+	if format == "" {
+		format = "bin"
+	}
+	return name + "." + format
+}
+
+func packageContentType(packageFormat string) string {
+	switch strings.TrimSpace(packageFormat) {
+	case "zip":
+		return "application/zip"
+	case "tar.gz", "tgz":
+		return "application/gzip"
+	default:
+		return "application/octet-stream"
+	}
+}

platform/service/distributions_test.go

@@ -190,6 +190,37 @@ func TestCoreServiceDistributionBuildRejectsPrematureSuccessAndCanRetryAfterUplo
 	}
 }
 
+func TestCoreServiceRunDistributionDownloadUsesTargetPackageName(t *testing.T) {
+	svc, session, instance := newDistributionTestFixture(t)
+	distribution, err := svc.GenerateRunDistributionForSession(session, domain.RunDistributionGenerateRequest{
+		ServerInstanceID: instance.ID,
+		TargetOS:         "windows",
+		TargetArch:       "amd64",
+		IdempotencyKey:   "idem-run-download-name",
+	})
+	if err != nil {
+		t.Fatalf("generate run distribution: %v", err)
+	}
+	payload := []byte("windows zipped run package")
+	completeDistributionBuild(t, svc, distribution, payload)
+
+	reference, err := svc.OpenArtifactDownloadForSession(session, domain.ArtifactDownloadReferenceRequest{ArtifactID: distribution.ArtifactID})
+	if err != nil {
+		t.Fatalf("open run artifact download: %v", err)
+	}
+	if reference.Filename != "run-windows-amd64.zip" || reference.ContentType != "application/zip" {
+		t.Fatalf("expected windows run package metadata, got %+v", reference)
+	}
+
+	content, err := svc.ReadArtifactContentForSession(session, domain.ArtifactContentRequest{ArtifactID: distribution.ArtifactID, Limit: len(payload)})
+	if err != nil {
+		t.Fatalf("read run artifact content: %v", err)
+	}
+	if content.Filename != reference.Filename || content.ContentType != reference.ContentType {
+		t.Fatalf("expected content metadata to match reference, reference=%+v content=%+v", reference, content)
+	}
+}
+
 func TestCoreServiceRunDistributionRetryReusesPartialArtifact(t *testing.T) {
 	svc, session, instance := newDistributionTestFixture(t)
 	key, plainKey, err := svc.ensureActiveComponentKey(instance.ID, domain.DistributionComponentRun, "")