feat(misconf): add OpenTofu file extension support

pkg/iac/detection/detect.go

@@ -265,7 +265,7 @@ func IsTerraformFile(path string) bool {
 		return true
 	}
 
-	for _, ext := range []string{".tf", ".tf.json", ".tfvars"} {
+	for _, ext := range []string{".tf", ".tf.json", ".tfvars", ".tofu", ".tofu.json"} {
 		if strings.HasSuffix(path, ext) {
 			return true
 		}

pkg/iac/detection/detect_test.go

@@ -87,6 +87,46 @@ func Test_Detection(t *testing.T) {
 				FileTypeTerraform,
 			},
 		},
+		{
+			name: "tofu, no reader",
+			path: "main.tofu",
+			expected: []FileType{
+				FileTypeTerraform,
+			},
+		},
+		{
+			name: "tofu, with reader",
+			path: "main.tofu",
+			r:    strings.NewReader("some file content"),
+			expected: []FileType{
+				FileTypeTerraform,
+			},
+		},
+		{
+			name: "tofu json, no reader",
+			path: "main.tofu.json",
+			expected: []FileType{
+				FileTypeTerraform,
+				FileTypeJSON,
+			},
+		},
+		{
+			name: "tofu json, with reader",
+			path: "main.tofu.json",
+			r: strings.NewReader(`
+{
+  "variable": {
+    "example": {
+      "default": "hello"
+    }
+  }
+}
+`),
+			expected: []FileType{
+				FileTypeTerraform,
+				FileTypeJSON,
+			},
+		},
 		{
 			name: "cloudformation, no reader",
 			path: "main.yaml",

pkg/iac/scanners/terraform/parser/parser.go

@@ -97,8 +97,8 @@ func (p *Parser) Files() map[string]*hcl.File {
 
 func (p *Parser) ParseFile(_ context.Context, fullPath string) error {
 
-	isJSON := strings.HasSuffix(fullPath, ".tf.json")
-	isHCL := strings.HasSuffix(fullPath, ".tf")
+	isJSON := strings.HasSuffix(fullPath, ".tf.json") || strings.HasSuffix(fullPath, ".tofu.json")
+	isHCL := strings.HasSuffix(fullPath, ".tf") || strings.HasSuffix(fullPath, ".tofu")
 	if !isJSON && !isHCL {
 		return nil
 	}