policy-engine/pkg/chain/marshal_json.go

package chain

import (
	"fmt"
	"strconv"

	jlexer "github.com/mailru/easyjson/jlexer"
	jwriter "github.com/mailru/easyjson/jwriter"
)

// Run `make generate`` if types added or changed

var matchTypeToJSONValue = []struct {
	mt  MatchType
	str string
}{
	{MatchTypeDenyPriority, "DenyPriority"},
	{MatchTypeFirstMatch, "FirstMatch"},
}

var statusToJSONValue = []struct {
	s   Status
	str string
}{
	{Allow, "Allow"},
	{NoRuleFound, "NoRuleFound"},
	{AccessDenied, "AccessDenied"},
	{QuotaLimitReached, "QuotaLimitReached"},
}

var objectTypeToJSONValue = []struct {
	t   ObjectType
	str string
}{
	{ObjectRequest, "Request"},
	{ObjectResource, "Resource"},
}

func (mt MatchType) MarshalEasyJSON(w *jwriter.Writer) {
	for _, p := range matchTypeToJSONValue {
		if p.mt == mt {
			w.String(p.str)
			return
		}
	}
	w.String(strconv.FormatUint(uint64(mt), 10))
}

func (mt *MatchType) UnmarshalEasyJSON(l *jlexer.Lexer) {
	str := l.String()
	for _, p := range matchTypeToJSONValue {
		if p.str == str {
			*mt = p.mt
			return
		}
	}

	v, err := strconv.ParseUint(str, 10, 8)
	if err != nil {
		l.AddError(fmt.Errorf("failed to parse match type: %w", err))
		return
	}
	*mt = MatchType(v)
}

func (st Status) MarshalEasyJSON(w *jwriter.Writer) {
	for _, p := range statusToJSONValue {
		if p.s == st {
			w.String(p.str)
			return
		}
	}
	w.String(strconv.FormatUint(uint64(st), 10))
}

func (st *Status) UnmarshalEasyJSON(l *jlexer.Lexer) {
	str := l.String()
	for _, p := range statusToJSONValue {
		if p.str == str {
			*st = p.s
			return
		}
	}

	v, err := strconv.ParseUint(str, 10, 8)
	if err != nil {
		l.AddError(fmt.Errorf("failed to parse status: %w", err))
		return
	}
	*st = Status(v)
}

func (ot ObjectType) MarshalEasyJSON(w *jwriter.Writer) {
	for _, p := range objectTypeToJSONValue {
		if p.t == ot {
			w.String(p.str)
			return
		}
	}
	w.String(strconv.FormatUint(uint64(ot), 10))
}

func (ot *ObjectType) UnmarshalEasyJSON(l *jlexer.Lexer) {
	str := l.String()
	for _, p := range objectTypeToJSONValue {
		if p.str == str {
			*ot = p.t
			return
		}
	}

	v, err := strconv.ParseUint(str, 10, 8)
	if err != nil {
		l.AddError(fmt.Errorf("failed to parse object type: %w", err))
		return
	}
	*ot = ObjectType(v)
}

func (ct ConditionType) MarshalEasyJSON(w *jwriter.Writer) {
	for _, p := range condToStr {
		if p.ct == ct {
			w.String(p.str)
			return
		}
	}
	w.String(strconv.FormatUint(uint64(ct), 10))
}

func (ct *ConditionType) UnmarshalEasyJSON(l *jlexer.Lexer) {
	str := l.String()
	for _, p := range condToStr {
		if p.str == str {
			*ct = p.ct
			return
		}
	}

	v, err := strconv.ParseUint(str, 10, 8)
	if err != nil {
		l.AddError(fmt.Errorf("failed to parse condition type: %w", err))
		return
	}
	*ct = ConditionType(v)
}