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

217 lines
5.2 KiB

package validator
import (
"reflect"
"strconv"
"strings"
)
const (
namespaceSeparator = "."
leftBracket = "["
rightBracket = "]"
)
func (v *Validate) extractType(current reflect.Value) (reflect.Value, reflect.Kind) {
switch current.Kind() {
case reflect.Ptr:
if current.IsNil() {
return current, reflect.Ptr
}
return v.extractType(current.Elem())
case reflect.Interface:
if current.IsNil() {
return current, reflect.Interface
}
return v.extractType(current.Elem())
case reflect.Invalid:
return current, reflect.Invalid
default:
if v.config.hasCustomFuncs {
if fn, ok := v.config.CustomTypeFuncs[current.Type()]; ok {
return v.extractType(reflect.ValueOf(fn(current)))
}
}
return current, current.Kind()
}
}
func (v *Validate) getStructFieldOK(current reflect.Value, namespace string) (reflect.Value, reflect.Kind, bool) {
current, kind := v.extractType(current)
if kind == reflect.Invalid {
return current, kind, false
}
if len(namespace) == 0 {
return current, kind, true
}
switch kind {
case reflect.Ptr, reflect.Interface:
return current, kind, false
case reflect.Struct:
typ := current.Type()
fld := namespace
ns := namespace
if typ != timeType && typ != timePtrType {
idx := strings.Index(namespace, namespaceSeparator)
if idx != -1 {
fld = namespace[:idx]
ns = namespace[idx+1:]
} else {
ns = ""
idx = len(namespace)
}
bracketIdx := strings.Index(fld, leftBracket)
if bracketIdx != -1 {
fld = fld[:bracketIdx]
ns = namespace[bracketIdx:]
}
current = current.FieldByName(fld)
return v.getStructFieldOK(current, ns)
}
case reflect.Array, reflect.Slice:
idx := strings.Index(namespace, leftBracket)
idx2 := strings.Index(namespace, rightBracket)
arrIdx, _ := strconv.Atoi(namespace[idx+1 : idx2])
if arrIdx >= current.Len() {
return current, kind, false
}
startIdx := idx2 + 1
if startIdx < len(namespace) {
if namespace[startIdx:startIdx+1] == namespaceSeparator {
startIdx++
}
}
return v.getStructFieldOK(current.Index(arrIdx), namespace[startIdx:])
case reflect.Map:
idx := strings.Index(namespace, leftBracket) + 1
idx2 := strings.Index(namespace, rightBracket)
endIdx := idx2
if endIdx+1 < len(namespace) {
if namespace[endIdx+1:endIdx+2] == namespaceSeparator {
endIdx++
}
}
key := namespace[idx:idx2]
switch current.Type().Key().Kind() {
case reflect.Int:
i, _ := strconv.Atoi(key)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
case reflect.Int8:
i, _ := strconv.ParseInt(key, 10, 8)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(int8(i))), namespace[endIdx+1:])
case reflect.Int16:
i, _ := strconv.ParseInt(key, 10, 16)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(int16(i))), namespace[endIdx+1:])
case reflect.Int32:
i, _ := strconv.ParseInt(key, 10, 32)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(int32(i))), namespace[endIdx+1:])
case reflect.Int64:
i, _ := strconv.ParseInt(key, 10, 64)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
case reflect.Uint:
i, _ := strconv.ParseUint(key, 10, 0)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint(i))), namespace[endIdx+1:])
case reflect.Uint8:
i, _ := strconv.ParseUint(key, 10, 8)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint8(i))), namespace[endIdx+1:])
case reflect.Uint16:
i, _ := strconv.ParseUint(key, 10, 16)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint16(i))), namespace[endIdx+1:])
case reflect.Uint32:
i, _ := strconv.ParseUint(key, 10, 32)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(uint32(i))), namespace[endIdx+1:])
case reflect.Uint64:
i, _ := strconv.ParseUint(key, 10, 64)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
case reflect.Float32:
f, _ := strconv.ParseFloat(key, 32)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(float32(f))), namespace[endIdx+1:])
case reflect.Float64:
f, _ := strconv.ParseFloat(key, 64)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(f)), namespace[endIdx+1:])
case reflect.Bool:
b, _ := strconv.ParseBool(key)
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(b)), namespace[endIdx+1:])
// reflect.Type = string
default:
return v.getStructFieldOK(current.MapIndex(reflect.ValueOf(key)), namespace[endIdx+1:])
}
}
// if got here there was more namespace, cannot go any deeper
panic("Invalid field namespace")
}
// 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)
panicIf(err)
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)
panicIf(err)
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)
panicIf(err)
return i
}
func panicIf(err error) {
if err != nil {
panic(err.Error())
}
}