package validator
import (
"context"
"fmt"
"reflect"
"strconv"
)
// per validate construct
type validate struct {
v *Validate
top reflect.Value
ns []byte
actualNs []byte
errs ValidationErrors
includeExclude map[string]struct{} // reset only if StructPartial or StructExcept are called, no need otherwise
ffn FilterFunc
slflParent reflect.Value // StructLevel & FieldLevel
slCurrent reflect.Value // StructLevel & FieldLevel
flField reflect.Value // StructLevel & FieldLevel
cf *cField // StructLevel & FieldLevel
ct *cTag // StructLevel & FieldLevel
misc []byte // misc reusable
str1 string // misc reusable
str2 string // misc reusable
fldIsPointer bool // StructLevel & FieldLevel
isPartial bool
hasExcludes bool
}
// parent and current will be the same the first run of validateStruct
func (v *validate) validateStruct(ctx context.Context, parent reflect.Value, current reflect.Value, typ reflect.Type, ns []byte, structNs []byte, ct *cTag) {
cs, ok := v.v.structCache.Get(typ)
if !ok {
cs = v.v.extractStructCache(current, typ.Name())
}
if len(ns) == 0 && len(cs.name) != 0 {
ns = append(ns, cs.name...)
ns = append(ns, '.')
structNs = append(structNs, cs.name...)
structNs = append(structNs, '.')
}
// ct is nil on top level struct, and structs as fields that have no tag info
// so if nil or if not nil and the structonly tag isn't present
if ct == nil || ct.typeof != typeStructOnly {
var f *cField
for i := 0; i < len(cs.fields); i++ {
f = cs.fields[i]
if v.isPartial {
if v.ffn != nil {
// used with StructFiltered
if v.ffn(append(structNs, f.name...)) {
continue
}
} else {
// used with StructPartial & StructExcept
_, ok = v.includeExclude[string(append(structNs, f.name...))]
if (ok && v.hasExcludes) || (!ok && !v.hasExcludes) {
continue
}
}
}
v.traverseField(ctx, parent, current.Field(f.idx), ns, structNs, f, f.cTags)
}
}
// check if any struct level validations, after all field validations already checked.
// first iteration will have no info about nostructlevel tag, and is checked prior to
// calling the next iteration of validateStruct called from traverseField.
if cs.fn != nil {
v.slflParent = parent
v.slCurrent = current
v.ns = ns
v.actualNs = structNs
cs.fn(ctx, v)
}
}
// traverseField validates any field, be it a struct or single field, ensures it's validity and passes it along to be validated via it's tag options
func (v *validate) traverseField(ctx context.Context, parent reflect.Value, current reflect.Value, ns []byte, structNs []byte, cf *cField, ct *cTag) {
var typ reflect.Type
var kind reflect.Kind
current, kind, v.fldIsPointer = v.extractTypeInternal(current, false)
switch kind {
case reflect.Ptr, reflect.Interface, reflect.Invalid:
if ct == nil {
return
}
if ct.typeof == typeOmitEmpty || ct.typeof == typeIsDefault {
return
}
if ct.hasTag {
if kind == reflect.Invalid {
v.str1 = string(append(ns, cf.altName...))
if v.v.hasTagNameFunc {
v.str2 = string(append(structNs, cf.name...))
} else {
v.str2 = v.str1
}
v.errs = append(v.errs,
&fieldError{
v: v.v,
tag: ct.aliasTag,
actualTag: ct.tag,
ns: v.str1,
structNs: v.str2,
fieldLen: uint8(len(cf.altName)),
structfieldLen: uint8(len(cf.name)),
param: ct.param,
kind: kind,
},
)
return
}
v.str1 = string(append(ns, cf.altName...))
if v.v.hasTagNameFunc {
v.str2 = string(append(structNs, cf.name...))
} else {
v.str2 = v.str1
}
if !ct.runValidationWhenNil {
v.errs = append(v.errs,
&fieldError{
v: v.v,
tag: ct.aliasTag,
actualTag: ct.tag,
ns: v.str1,
structNs: v.str2,
fieldLen: uint8(len(cf.altName)),
structfieldLen: uint8(len(cf.name)),
value: current.Interface(),
param: ct.param,
kind: kind,
typ: current.Type(),
},
)
return
}
}
case reflect.Struct:
typ = current.Type()
if typ != timeType {
if ct != nil {
if ct.typeof == typeStructOnly {
goto CONTINUE
} else if ct.typeof == typeIsDefault {
// set Field Level fields
v.slflParent = parent
v.flField = current
v.cf = cf
v.ct = ct
if !ct.fn(ctx, v) {
v.str1 = string(append(ns, cf.altName...))
if v.v.hasTagNameFunc {
v.str2 = string(append(structNs, cf.name...))
} else {
v.str2 = v.str1
}
v.errs = append(v.errs,
&fieldError{
v: v.v,
tag: ct.aliasTag,
actualTag: ct.tag,
ns: v.str1,
structNs: v.str2,
fieldLen: uint8(len(cf.altName)),
structfieldLen: uint8(len(cf.name)),
value: current.Interface(),
param: ct.param,
kind: kind,
typ: typ,
},
)
return
}
}
ct = ct.next
}
if ct != nil && ct.typeof == typeNoStructLevel {
return
}
CONTINUE:
// if len == 0 then validating using 'Var' or 'VarWithValue'
// Var - doesn't make much sense to do it that way, should call 'Struct', but no harm...
// VarWithField - this allows for validating against each field within the struct against a specific value
// pretty handy in certain situations
if len(cf.name) > 0 {
ns = append(append(ns, cf.altName...), '.')
structNs = append(append(structNs, cf.name...), '.')
}
v.validateStruct(ctx, current, current, typ, ns, structNs, ct)
return
}
}
if !ct.hasTag {
return
}
typ = current.Type()
OUTER:
for {
if ct == nil {
return
}
switch ct.typeof {
case typeOmitEmpty:
// set Field Level fields
v.slflParent = parent
v.flField = current
v.cf = cf
v.ct = ct
if !hasValue(v) {
return
}
ct = ct.next
continue
case typeEndKeys:
return
case typeDive:
ct = ct.next
// traverse slice or map here
// or panic ;)
switch kind {
case reflect.Slice, reflect.Array:
var i64 int64
reusableCF := &cField{}
for i := 0; i < current.Len(); i++ {
i64 = int64(i)
v.misc = append(v.misc[0:0], cf.name...)
v.misc = append(v.misc, '[')
v.misc = strconv.AppendInt(v.misc, i64, 10)
v.misc = append(v.misc, ']')
reusableCF.name = string(v.misc)
if cf.namesEqual {
reusableCF.altName = reusableCF.name
} else {
v.misc = append(v.misc[0:0], cf.altName...)
v.misc = append(v.misc, '[')
v.misc = strconv.AppendInt(v.misc, i64, 10)
v.misc = append(v.misc, ']')
reusableCF.altName = string(v.misc)
}
v.traverseField(ctx, parent, current.Index(i), ns, structNs, reusableCF, ct)
}
case reflect.Map:
var pv string
reusableCF := &cField{}
for _, key := range current.MapKeys() {
pv = fmt.Sprintf("%v", key.Interface())
v.misc = append(v.misc[0:0], cf.name...)
v.misc = append(v.misc, '[')
v.misc = append(v.misc, pv...)
v.misc = append(v.misc, ']')
reusableCF.name = string(v.misc)
if cf.namesEqual {
reusableCF.altName = reusableCF.name
} else {
v.misc = append(v.misc[0:0], cf.altName...)
v.misc = append(v.misc, '[')
v.misc = append(v.misc, pv...)
v.misc = append(v.misc, ']')
reusableCF.altName = string(v.misc)
}
if ct != nil && ct.typeof == typeKeys && ct.keys != nil {
v.traverseField(ctx, parent, key, ns, structNs, reusableCF, ct.keys)
// can be nil when just keys being validated
if ct.next != nil {
v.traverseField(ctx, parent, current.MapIndex(key), ns, structNs, reusableCF, ct.next)
}
} else {
v.traverseField(ctx, parent, current.MapIndex(key), ns, structNs, reusableCF, ct)
}
}
default:
// throw error, if not a slice or map then should not have gotten here
// bad dive tag
panic("dive error! can't dive on a non slice or map")
}
return
case typeOr:
v.misc = v.misc[0:0]
for {
// set Field Level fields
v.slflParent = parent
v.flField = current
v.cf = cf
v.ct = ct
if ct.fn(ctx, v) {
// drain rest of the 'or' values, then continue or leave
for {
ct = ct.next
if ct == nil {
return
}
if ct.typeof != typeOr {
continue OUTER
}
}
}
v.misc = append(v.misc, '|')
v.misc = append(v.misc, ct.tag...)
if ct.hasParam {
v.misc = append(v.misc, '=')
v.misc = append(v.misc, ct.param...)
}
if ct.isBlockEnd || ct.next == nil {
// if we get here, no valid 'or' value and no more tags
v.str1 = string(append(ns, cf.altName...))
if v.v.hasTagNameFunc {
v.str2 = string(append(structNs, cf.name...))
} else {
v.str2 = v.str1
}
if ct.hasAlias {
v.errs = append(v.errs,
&fieldError{
v: v.v,
tag: ct.aliasTag,
actualTag: ct.actualAliasTag,
ns: v.str1,
structNs: v.str2,
fieldLen: uint8(len(cf.altName)),
structfieldLen: uint8(len(cf.name)),
value: current.Interface(),
param: ct.param,
kind: kind,
typ: typ,
},
)
} else {
tVal := string(v.misc)[1:]
v.errs = append(v.errs,
&fieldError{
v: v.v,
tag: tVal,
actualTag: tVal,
ns: v.str1,
structNs: v.str2,
fieldLen: uint8(len(cf.altName)),
structfieldLen: uint8(len(cf.name)),
value: current.Interface(),
param: ct.param,
kind: kind,
typ: typ,
},
)
}
return
}
ct = ct.next
}
default:
// set Field Level fields
v.slflParent = parent
v.flField = current
v.cf = cf
v.ct = ct
if !ct.fn(ctx, v) {
v.str1 = string(append(ns, cf.altName...))
if v.v.hasTagNameFunc {
v.str2 = string(append(structNs, cf.name...))
} else {
v.str2 = v.str1
}
v.errs = append(v.errs,
&fieldError{
v: v.v,
tag: ct.aliasTag,
actualTag: ct.tag,
ns: v.str1,
structNs: v.str2,
fieldLen: uint8(len(cf.altName)),
structfieldLen: uint8(len(cf.name)),
value: current.Interface(),
param: ct.param,
kind: kind,
typ: typ,
},
)
return
}
ct = ct.next
}
}
}
