validators: add string length validator

pkg/cloudcommon/validators/validators_string.go

@@ -0,0 +1,81 @@
+// Copyright 2019 Yunion
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package validators
+
+import (
+	"yunion.io/x/jsonutils"
+)
+
+type ValidatorStringLen struct {
+	Validator
+	Value  string
+	minLen int
+	maxLen int
+}
+
+func NewStringLenRangeValidator(key string, minLen, maxLen int) *ValidatorStringLen {
+	v := &ValidatorStringLen{
+		Validator: Validator{Key: key},
+		minLen:    minLen,
+		maxLen:    maxLen,
+	}
+	v.SetParent(v)
+	return v
+}
+
+func NewMinStringLenValidator(key string, minLen int) *ValidatorStringLen {
+	return NewStringLenRangeValidator(key, minLen, -1)
+}
+
+func NewMaxStringLenValidator(key string, maxLen int) *ValidatorStringLen {
+	return NewStringLenRangeValidator(key, -1, maxLen)
+}
+
+func NewStringNonEmptyValidator(key string) *ValidatorStringLen {
+	return NewMinStringLenValidator(key, 1)
+}
+
+func (v *ValidatorStringLen) Default(s string) IValidator {
+	if v.minLen >= 0 && len(s) < v.minLen {
+		panic("invalid default string: shorter than validator requirement")
+	}
+	if v.maxLen >= 0 && len(s) > v.maxLen {
+		panic("invalid default string: shorter than validator requirement")
+	}
+	return v.Validator.Default(s)
+}
+
+func (v *ValidatorStringLen) getValue() interface{} {
+	return v.Value
+}
+
+func (v *ValidatorStringLen) Validate(data *jsonutils.JSONDict) error {
+	if err, isSet := v.Validator.validateEx(data); err != nil || !isSet {
+		return err
+	}
+	s, err := v.value.GetString()
+	if err != nil {
+		return newGeneralError(v.Key, err)
+	}
+	if v.minLen >= 0 && len(s) < v.minLen {
+		return newStringTooShortError(v.Key, len(s), v.minLen)
+	}
+	if v.maxLen >= 0 && len(s) > v.maxLen {
+		return newStringTooLongError(v.Key, len(s), v.maxLen)
+	}
+	data.Set(v.Key, jsonutils.NewString(s))
+	v.Value = s
+	return nil
+}