💯Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
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validator/baked_in.go

217 lines
4.6 KiB

package validator
import (
"fmt"
"reflect"
"strconv"
)
// BakedInValidators is the map of ValidationFunc used internally
// but can be used with any new Validator if desired
var BakedInValidators = map[string]ValidationFunc{
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"required": required,
"len": length,
"min": min,
"max": max,
"alpha": alpha,
"alphanum": alphanum,
}
func alphanum(field interface{}, param string) bool {
st := reflect.ValueOf(field)
switch st.Kind() {
case reflect.String:
return alphaNumericRegex.MatchString(field.(string))
default:
panic(fmt.Sprintf("Bad field type %T", field))
}
}
func alpha(field interface{}, param string) bool {
st := reflect.ValueOf(field)
switch st.Kind() {
case reflect.String:
return alphaRegex.MatchString(field.(string))
default:
panic(fmt.Sprintf("Bad field type %T", field))
}
}
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func required(field interface{}, param string) bool {
st := reflect.ValueOf(field)
switch st.Kind() {
case reflect.Slice, reflect.Map, reflect.Array:
return field != nil && int64(st.Len()) > 0
default:
return field != nil && field != reflect.Zero(reflect.TypeOf(field)).Interface()
}
}
// length tests whether a variable's length is equal to a given
// value. For strings it tests the number of characters whereas
// for maps and slices it tests the number of items.
func length(field interface{}, param string) bool {
st := reflect.ValueOf(field)
switch st.Kind() {
case reflect.String:
p := asInt(param)
return int64(len(st.String())) == p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(st.Len()) == p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return st.Int() == p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return st.Uint() == p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return st.Float() == p
default:
panic(fmt.Sprintf("Bad field type for Input Param %s for %s\n", param, field))
}
}
// min tests whether a variable value is larger or equal to a given
// number. For number types, it's a simple lesser-than test; for
// strings it tests the number of characters whereas for maps
// and slices it tests the number of items.
func min(field interface{}, param string) bool {
st := reflect.ValueOf(field)
switch st.Kind() {
case reflect.String:
p := asInt(param)
return int64(len(st.String())) >= p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(st.Len()) >= p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return st.Int() >= p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return st.Uint() >= p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return st.Float() >= p
default:
panic(fmt.Sprintf("Bad field type for Input Param %s for %s\n", param, field))
}
}
// max tests whether a variable value is lesser than a given
// value. For numbers, it's a simple lesser-than test; for
// strings it tests the number of characters whereas for maps
// and slices it tests the number of items.
func max(field interface{}, param string) bool {
st := reflect.ValueOf(field)
switch st.Kind() {
case reflect.String:
p := asInt(param)
return int64(len(st.String())) <= p
case reflect.Slice, reflect.Map, reflect.Array:
p := asInt(param)
return int64(st.Len()) <= p
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
p := asInt(param)
return st.Int() <= p
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
p := asUint(param)
return st.Uint() <= p
case reflect.Float32, reflect.Float64:
p := asFloat(param)
return st.Float() <= p
default:
panic(fmt.Sprintf("Bad field type for Input Param %s for %s\n", param, field))
}
}
// asInt retuns the parameter as a int64
// or panics if it can't convert
func asInt(param string) int64 {
i, err := strconv.ParseInt(param, 0, 64)
if err != nil {
panic(fmt.Sprintf("Bad Input Param %s\n", param))
}
return i
}
// asUint returns the parameter as a uint64
// or panics if it can't convert
func asUint(param string) uint64 {
i, err := strconv.ParseUint(param, 0, 64)
if err != nil {
panic(fmt.Sprintf("Bad Input Param %s\n", param))
}
return i
}
// asFloat returns the parameter as a float64
// or panics if it can't convert
func asFloat(param string) float64 {
i, err := strconv.ParseFloat(param, 64)
if err != nil {
panic(fmt.Sprintf("Bad Input Param %s\n", param))
}
return i
}