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validators.go
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validators.go
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// Copyright 2022-2023 The Inspektor Gadget authors
//
// 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 params
import (
"fmt"
"net"
"strconv"
"strings"
"time"
)
type TypeHint string
const (
TypeUnknown TypeHint = ""
TypeBool TypeHint = "bool"
TypeString TypeHint = "string"
TypeBytes TypeHint = "bytes"
TypeInt TypeHint = "int"
TypeInt8 TypeHint = "int8"
TypeInt16 TypeHint = "int16"
TypeInt32 TypeHint = "int32"
TypeInt64 TypeHint = "int64"
TypeUint TypeHint = "uint"
TypeUint8 TypeHint = "uint8"
TypeUint16 TypeHint = "uint16"
TypeUint32 TypeHint = "uint32"
TypeUint64 TypeHint = "uint64"
TypeFloat32 TypeHint = "float32"
TypeFloat64 TypeHint = "float64"
TypeDuration TypeHint = "duration"
TypeIP TypeHint = "ip"
)
var typeHintValidators = map[TypeHint]ParamValidator{
TypeBool: ValidateBool,
TypeInt: ValidateInt(strconv.IntSize),
TypeInt8: ValidateInt(8),
TypeInt16: ValidateInt(16),
TypeInt32: ValidateInt(32),
TypeInt64: ValidateInt(64),
TypeUint: ValidateUint(strconv.IntSize),
TypeUint8: ValidateUint(8),
TypeUint16: ValidateUint(16),
TypeUint32: ValidateUint(32),
TypeUint64: ValidateUint(64),
TypeFloat32: ValidateFloat(32),
TypeFloat64: ValidateFloat(64),
TypeDuration: ValidateDuration,
TypeIP: ValidateIP,
}
type ValueHint string
type ParamValidator func(value string) error
func ValidateInt(bitsize int) func(string) error {
return func(value string) error {
_, err := strconv.ParseInt(value, 10, bitsize)
if err != nil {
return fmt.Errorf("expected numeric value: %w", err)
}
return nil
}
}
func ValidateUint(bitsize int) func(string) error {
return func(value string) error {
_, err := strconv.ParseUint(value, 10, bitsize)
if err != nil {
return fmt.Errorf("expected numeric value: %w", err)
}
return nil
}
}
func ValidateFloat(bitsize int) func(string) error {
return func(value string) error {
_, err := strconv.ParseFloat(value, bitsize)
if err != nil {
return fmt.Errorf("expected numeric value: %w", err)
}
return nil
}
}
func ValidateBool(value string) error {
value = strings.ToLower(value)
if value != "true" && value != "false" {
return fmt.Errorf("expected 'true' or 'false', got: %q", value)
}
return nil
}
func ValidateIntRange(min, max int64) func(value string) error {
return func(value string) error {
number, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return fmt.Errorf("expected numeric value")
}
if number < min || number > max {
return fmt.Errorf("number out of range: got %d, expected min %d, max %d", number, min, max)
}
return nil
}
}
func ValidateUintRange(min, max uint64) func(value string) error {
return func(value string) error {
number, err := strconv.ParseUint(value, 10, 64)
if err != nil {
return fmt.Errorf("expected numeric value: %w", err)
}
if number < min || number > max {
return fmt.Errorf("number out of range: got %d, expected min %d, max %d", number, min, max)
}
return nil
}
}
func ValidateSlice(validator ParamValidator) func(value string) error {
return func(value string) error {
// No value to validate
if len(value) == 0 {
return nil
}
for i, val := range strings.Split(value, ",") {
if err := validator(val); err != nil {
return fmt.Errorf("entry #%d (%q): %w", i+1, val, err)
}
}
return nil
}
}
func ValidateDuration(value string) error {
_, err := time.ParseDuration(value)
return err
}
func ValidateIP(value string) error {
if value != "" && net.ParseIP(value) == nil {
return fmt.Errorf("%q is not a valid IP address", value)
}
return nil
}