Initial commit.

internal/config/validator.go

@@ -0,0 +1,61 @@
+package config
+
+import (
+	"bytes"
+	"fmt"
+	"strings"
+	"text/template"
+)
+
+// ValidatePaths checks if all required paths exist in the config
+// Returns a list of missing paths
+func ValidatePaths(config map[string]interface{}, paths []string) []string {
+	var missing []string
+	for _, path := range paths {
+		if GetValue(config, path) == nil {
+			missing = append(missing, path)
+		}
+	}
+	return missing
+}
+
+// GetValue retrieves a nested value from config using dot notation
+// Returns nil if the path doesn't exist
+func GetValue(config map[string]interface{}, path string) interface{} {
+	parts := strings.Split(path, ".")
+	var current interface{} = config
+
+	for _, part := range parts {
+		m, ok := current.(map[string]interface{})
+		if !ok {
+			return nil
+		}
+		current = m[part]
+		if current == nil {
+			return nil
+		}
+	}
+
+	return current
+}
+
+// ExpandTemplate expands {{ .path.to.value }} templates in the string
+// Returns the original string if no templates are present
+func ExpandTemplate(tmpl string, config map[string]interface{}) (string, error) {
+	// Return original if no template markers
+	if !strings.Contains(tmpl, "{{") {
+		return tmpl, nil
+	}
+
+	t, err := template.New("config").Parse(tmpl)
+	if err != nil {
+		return "", fmt.Errorf("parse template: %w", err)
+	}
+
+	var buf bytes.Buffer
+	if err := t.Execute(&buf, config); err != nil {
+		return "", fmt.Errorf("execute template: %w", err)
+	}
+
+	return buf.String(), nil
+}