Introduce maputil (#919)

* introduce maputil

* add GetMapOptional

* linting

* linting 2

Author: itsmylife

data/utils/maputil/maputil.go

@@ -0,0 +1,81 @@
+package maputil
+
+import "fmt"
+
+func GetMap(obj map[string]any, key string) (map[string]any, error) {
+	if untypedValue, ok := obj[key]; ok {
+		if value, ok := untypedValue.(map[string]any); ok {
+			return value, nil
+		}
+		err := fmt.Errorf("the field '%s' should be an object", key)
+		return nil, err
+	}
+
+	err := fmt.Errorf("the field '%s' should be set", key)
+	return nil, err
+}
+
+func GetMapOptional(obj map[string]any, key string) (map[string]any, error) {
+	if untypedValue, ok := obj[key]; ok {
+		if value, ok := untypedValue.(map[string]any); ok {
+			return value, nil
+		}
+		err := fmt.Errorf("the field '%s' should be an object", key)
+		return nil, err
+	}
+
+	// Value optional, not error
+	return nil, nil
+}
+
+func GetBool(obj map[string]any, key string) (bool, error) {
+	if untypedValue, ok := obj[key]; ok {
+		if value, ok := untypedValue.(bool); ok {
+			return value, nil
+		}
+		err := fmt.Errorf("the field '%s' should be a bool", key)
+		return false, err
+	}
+
+	err := fmt.Errorf("the field '%s' should be set", key)
+	return false, err
+}
+
+func GetBoolOptional(obj map[string]any, key string) (bool, error) {
+	if untypedValue, ok := obj[key]; ok {
+		if value, ok := untypedValue.(bool); ok {
+			return value, nil
+		}
+		err := fmt.Errorf("the field '%s' should be a bool", key)
+		return false, err
+	}
+
+	// Value optional, not error
+	return false, nil
+}
+
+func GetString(obj map[string]any, key string) (string, error) {
+	if untypedValue, ok := obj[key]; ok {
+		if value, ok := untypedValue.(string); ok {
+			return value, nil
+		}
+		err := fmt.Errorf("the field '%s' should be a string", key)
+		return "", err
+	}
+
+	err := fmt.Errorf("the field '%s' should be set", key)
+	return "", err
+}
+
+func GetStringOptional(obj map[string]any, key string) (string, error) {
+	if untypedValue, ok := obj[key]; ok {
+		if value, ok := untypedValue.(string); ok {
+			return value, nil
+		}
+		err := fmt.Errorf("the field '%s' should be a string", key)
+		return "", err
+	}
+
+	// Value optional, not error
+	return "", nil
+}