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package extensions
import (
"encoding/json"
"reflect"
"strings"
"github.com/envoyproxy/protoc-gen-validate/validate"
"github.com/pseudomuto/protoc-gen-doc/extensions"
)
// ValidateRule represents a single validator rule from the (validate.rules) method option extension.
type ValidateRule struct {
Name string `json:"name"`
Value interface{} `json:"value"`
}
// ValidateExtension contains the rules set by the (validate.rules) method option extension.
type ValidateExtension struct {
*validate.FieldRules
rules []ValidateRule // memoized so that we don't have to use reflection more than we need.
}
// MarshalJSON implements the json.Marshaler interface.
func (v ValidateExtension) MarshalJSON() ([]byte, error) { return json.Marshal(v.Rules()) }
// Rules returns the set of rules for this extension.
func (v ValidateExtension) Rules() []ValidateRule {
if v.FieldRules == nil {
return nil
}
if v.rules == nil {
v.rules = flattenRules("", reflect.ValueOf(v.FieldRules))
}
return v.rules
}
func flattenRules(prefix string, vv reflect.Value) (rules []ValidateRule) {
vv = reflect.Indirect(vv)
vt := vv.Type()
switch vt.Kind() {
case reflect.Struct:
nextField:
for i := 0; i < vt.NumField(); i++ {
f := vt.Field(i)
ft := f.Type
fv := vv.Field(i)
for ft.Kind() == reflect.Interface || ft.Kind() == reflect.Ptr {
if fv.IsNil() {
continue nextField
}
fv = fv.Elem()
ft = fv.Type()
}
name := prefix
if tag, ok := f.Tag.Lookup("protobuf"); ok {
for _, opt := range strings.Split(tag, ",") {
if strings.HasPrefix(opt, "name=") {
if name != "" && !strings.HasSuffix(name, ".") {
name += "."
}
name += strings.TrimPrefix(opt, "name=")
break
}
}
} else if _, ok := f.Tag.Lookup("protobuf_oneof"); !ok {
continue nextField
}
rules = append(rules, flattenRules(name, fv)...)
}
case reflect.Slice:
if vv.Len() == 0 {
return nil
}
fallthrough
default:
rules = append(rules, ValidateRule{Name: prefix, Value: vv.Interface()})
}
return rules
}
func init() {
extensions.SetTransformer("validate.rules", func(payload interface{}) interface{} {
rules, ok := payload.(*validate.FieldRules)
if !ok {
return nil
}
return ValidateExtension{FieldRules: rules}
})
}
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