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

239 lines
6.4 KiB

package validator
import (
"reflect"
"strconv"
"strings"
)
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// import (
// "reflect"
// "strconv"
// "strings"
// )
// const (
// blank = ""
// namespaceSeparator = "."
// leftBracket = "["
// rightBracket = "]"
// restrictedTagChars = ".[],|=+()`~!@#$%^&*\\\"/?<>{}"
// restrictedAliasErr = "Alias '%s' either contains restricted characters or is the same as a restricted tag needed for normal operation"
// restrictedTagErr = "Tag '%s' either contains restricted characters or is the same as a restricted tag needed for normal operation"
// )
// extractTypeInternal gets the actual underlying type of field value.
// It will dive into pointers, customTypes and return you the
// underlying value and it's kind.
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func (v *validate) extractTypeInternal(current reflect.Value, nullable bool) (reflect.Value, reflect.Kind, bool) {
switch current.Kind() {
case reflect.Ptr:
nullable = true
if current.IsNil() {
return current, reflect.Ptr, nullable
}
return v.extractTypeInternal(current.Elem(), nullable)
case reflect.Interface:
nullable = true
if current.IsNil() {
return current, reflect.Interface, nullable
}
return v.extractTypeInternal(current.Elem(), nullable)
case reflect.Invalid:
return current, reflect.Invalid, nullable
default:
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if v.v.hasCustomFuncs {
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if fn, ok := v.v.customFuncs[current.Type()]; ok {
return v.extractTypeInternal(reflect.ValueOf(fn(current)), nullable)
}
}
return current, current.Kind(), nullable
}
}
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// getStructFieldOKInternal traverses a struct to retrieve a specific field denoted by the provided namespace and
// returns the field, field kind and whether is was successful in retrieving the field at all.
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//
// NOTE: when not successful ok will be false, this can happen when a nested struct is nil and so the field
// could not be retrieved because it didn't exist.
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func (v *validate) getStructFieldOKInternal(current reflect.Value, namespace string) (reflect.Value, reflect.Kind, bool) {
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current, kind, _ := v.ExtractType(current)
if kind == reflect.Invalid {
return current, kind, false
}
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if namespace == "" {
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
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if typ != timeType {
idx := strings.Index(namespace, namespaceSeparator)
if idx != -1 {
fld = namespace[:idx]
ns = namespace[idx+1:]
} else {
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ns = ""
}
bracketIdx := strings.Index(fld, leftBracket)
if bracketIdx != -1 {
fld = fld[:bracketIdx]
ns = namespace[bracketIdx:]
}
current = current.FieldByName(fld)
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return v.getStructFieldOKInternal(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++
}
}
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return v.getStructFieldOKInternal(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)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
case reflect.Int8:
i, _ := strconv.ParseInt(key, 10, 8)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(int8(i))), namespace[endIdx+1:])
case reflect.Int16:
i, _ := strconv.ParseInt(key, 10, 16)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(int16(i))), namespace[endIdx+1:])
case reflect.Int32:
i, _ := strconv.ParseInt(key, 10, 32)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(int32(i))), namespace[endIdx+1:])
case reflect.Int64:
i, _ := strconv.ParseInt(key, 10, 64)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
case reflect.Uint:
i, _ := strconv.ParseUint(key, 10, 0)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(uint(i))), namespace[endIdx+1:])
case reflect.Uint8:
i, _ := strconv.ParseUint(key, 10, 8)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(uint8(i))), namespace[endIdx+1:])
case reflect.Uint16:
i, _ := strconv.ParseUint(key, 10, 16)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(uint16(i))), namespace[endIdx+1:])
case reflect.Uint32:
i, _ := strconv.ParseUint(key, 10, 32)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(uint32(i))), namespace[endIdx+1:])
case reflect.Uint64:
i, _ := strconv.ParseUint(key, 10, 64)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(i)), namespace[endIdx+1:])
case reflect.Float32:
f, _ := strconv.ParseFloat(key, 32)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(float32(f))), namespace[endIdx+1:])
case reflect.Float64:
f, _ := strconv.ParseFloat(key, 64)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(f)), namespace[endIdx+1:])
case reflect.Bool:
b, _ := strconv.ParseBool(key)
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(b)), namespace[endIdx+1:])
// reflect.Type = string
default:
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return v.getStructFieldOKInternal(current.MapIndex(reflect.ValueOf(key)), namespace[endIdx+1:])
}
}
// if got here there was more namespace, cannot go any deeper
panic("Invalid field namespace")
}
// asInt returns 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())
}
}