Add Kustomize detector line mapping

pkg/detector/kustomize/detect.go

@@ -0,0 +1,108 @@
+package kustomize
+
+import (
+	"context"
+	"path/filepath"
+	"strings"
+
+	"github.com/DataDog/datadog-iac-scanner/pkg/detector"
+	"github.com/DataDog/datadog-iac-scanner/pkg/model"
+	"github.com/DataDog/datadog-iac-scanner/pkg/rootfile"
+)
+
+// DetectKindLine maps Kustomize-rendered findings back to source lines.
+type DetectKindLine struct{}
+
+// DetectLine: direct sources use default YAML tracing; generators/transformers use kustomization lines.
+func (DetectKindLine) DetectLine(
+	ctx context.Context,
+	file *model.FileMetadata,
+	searchKey string,
+	outputLines int,
+) model.VulnerabilityLines {
+	o := file.KustomizeOrigin
+	if o != nil && o.OriginKind == model.KustomizeOriginDirect && o.SourceFile != "" && o.SourceRepo == "" {
+		if v := directSourceDetectLine(o.SourceFile, searchKey, outputLines); v.Line > 0 {
+			return v
+		}
+	}
+	if o == nil || !o.RequiresDetailedLineMapping() {
+		return detector.DefaultYAMLDetectLine{}.DetectLine(ctx, file, searchKey, outputLines)
+	}
+	cfg := o.GeneratorConfigFile
+	if cfg == "" {
+		return detector.DefaultYAMLDetectLine{}.DetectLine(ctx, file, searchKey, outputLines)
+	}
+	data, err := rootfile.ReadFile(filepath.Clean(cfg))
+	if err != nil {
+		return detector.DefaultYAMLDetectLine{}.DetectLine(ctx, file, searchKey, outputLines)
+	}
+	lines := strings.Split(string(data), "\n")
+	if v, ok := mappedLineFromKustomizeOrigin(ctx, file, o, searchKey, outputLines, lines); ok {
+		return v
+	}
+	return detector.DefaultYAMLDetectLine{}.DetectLine(ctx, file, searchKey, outputLines)
+}
+
+func mappedLineFromKustomizeOrigin(
+	ctx context.Context,
+	file *model.FileMetadata,
+	o *model.KustomizeOrigin,
+	searchKey string,
+	outputLines int,
+	lines []string,
+) (model.VulnerabilityLines, bool) {
+	switch o.OriginKind {
+	case model.KustomizeOriginGenerator:
+		name := o.ResourceName
+		if name == "" {
+			name = metadataNameFromDoc(file.Document)
+		}
+		line1, p := generatorConfigLine(o, name)
+		return buildMappedVulnLines(line1-1, p, lines, outputLines), true
+	case model.KustomizeOriginTransformer:
+		if v := transformerPatchFileLine(ctx, o, searchKey, outputLines); v.Line > 0 {
+			return v, true
+		}
+		if o.OriginalSourceFile != "" && o.OriginalSourceRepo == "" {
+			if v := directSourceDetectLine(o.OriginalSourceFile, searchKey, outputLines); v.Line > 0 {
+				return v, true
+			}
+		}
+		line1, p := transformerLineForOrigin(o)
+		return buildMappedVulnLines(line1-1, p, lines, outputLines), true
+	default:
+		return model.VulnerabilityLines{}, false
+	}
+}
+
+func buildMappedVulnLines(lineIdx int, resolvedPath string, lines []string, outputLines int) model.VulnerabilityLines {
+	if lineIdx < 0 {
+		lineIdx = 0
+	}
+	if lineIdx >= len(lines) {
+		lineIdx = 0
+	}
+	return model.VulnerabilityLines{
+		Line:                  lineIdx + 1,
+		VulnLines:             detector.GetAdjacentVulnLines(lineIdx, outputLines, lines),
+		LineWithVulnerability: strings.TrimSpace(lines[lineIdx]),
+		ResolvedFile:          resolvedPath,
+		VulnerablilityLocation: model.ResourceLocation{
+			Start: model.ResourceLine{Line: lineIdx + 1, Col: 1},
+			End:   model.ResourceLine{Line: lineIdx + 1, Col: 1},
+		},
+	}
+}
+
+func metadataNameFromDoc(doc model.Document) string {
+	if doc == nil {
+		return ""
+	}
+	m, ok := doc["metadata"].(map[string]interface{})
+	if !ok {
+		return ""
+	}
+	n, _ := m["name"].(string)
+	return n
+}