forked from TrueCloudLab/frostfs-http-gw
[#22] Update system attributes prefix
Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>
This commit is contained in:
parent
1f66149316
commit
a8ec09e76a
14 changed files with 562 additions and 448 deletions
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@ -1,10 +1,250 @@
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package utils
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"math"
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"strconv"
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"strings"
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"time"
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"unicode"
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"unicode/utf8"
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"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
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)
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const (
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UserAttributeHeaderPrefix = "X-Attribute-"
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SystemAttributePrefix = "__NEOFS__"
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ExpirationDurationAttr = SystemAttributePrefix + "EXPIRATION_DURATION"
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ExpirationTimestampAttr = SystemAttributePrefix + "EXPIRATION_TIMESTAMP"
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ExpirationRFC3339Attr = SystemAttributePrefix + "EXPIRATION_RFC3339"
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)
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const (
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systemAttributePrefix = "__SYSTEM__"
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// deprecated: use systemAttributePrefix
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systemAttributePrefixNeoFS = "__NEOFS__"
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)
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type systemTransformer struct {
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prefix string
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backwardPrefix string
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xAttrPrefixes [][]byte
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}
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var transformers = []systemTransformer{
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{
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prefix: systemAttributePrefix,
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backwardPrefix: "System-",
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xAttrPrefixes: [][]byte{[]byte("System-"), []byte("SYSTEM-"), []byte("system-")},
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},
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{
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prefix: systemAttributePrefixNeoFS,
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backwardPrefix: "Neofs-",
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xAttrPrefixes: [][]byte{[]byte("Neofs-"), []byte("NEOFS-"), []byte("neofs-")},
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},
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}
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func (t systemTransformer) existsExpirationAttributes(headers map[string]string) bool {
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_, ok0 := headers[t.expirationEpochAttr()]
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_, ok1 := headers[t.expirationDurationAttr()]
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_, ok2 := headers[t.expirationTimestampAttr()]
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_, ok3 := headers[t.expirationRFC3339Attr()]
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return ok0 || ok1 || ok2 || ok3
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}
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func (t systemTransformer) expirationEpochAttr() string {
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return t.prefix + "EXPIRATION_EPOCH"
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}
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func (t systemTransformer) expirationDurationAttr() string {
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return t.prefix + "EXPIRATION_DURATION"
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}
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func (t systemTransformer) expirationTimestampAttr() string {
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return t.prefix + "EXPIRATION_TIMESTAMP"
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}
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func (t systemTransformer) expirationRFC3339Attr() string {
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return t.prefix + "EXPIRATION_RFC3339"
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}
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func (t systemTransformer) systemTranslator(key, prefix []byte) []byte {
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// replace the specified prefix with system prefix
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key = bytes.Replace(key, prefix, []byte(t.prefix), 1)
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// replace `-` with `_`
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key = bytes.ReplaceAll(key, []byte("-"), []byte("_"))
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// replace with uppercase
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return bytes.ToUpper(key)
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}
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func (t systemTransformer) transformIfSystem(key []byte) ([]byte, bool) {
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// checks that it's a system FrostFS header
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for _, system := range t.xAttrPrefixes {
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if bytes.HasPrefix(key, system) {
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return t.systemTranslator(key, system), true
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}
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}
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return key, false
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}
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// systemBackwardTranslator is used to convert headers looking like '__PREFIX__ATTR_NAME' to 'Prefix-Attr-Name'.
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func (t systemTransformer) systemBackwardTranslator(key string) string {
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// trim specified prefix '__PREFIX__'
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key = strings.TrimPrefix(key, t.prefix)
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var res strings.Builder
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res.WriteString(t.backwardPrefix)
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strs := strings.Split(key, "_")
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for i, s := range strs {
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s = title(strings.ToLower(s))
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res.WriteString(s)
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if i != len(strs)-1 {
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res.WriteString("-")
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}
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}
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return res.String()
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}
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func (t systemTransformer) backwardTransformIfSystem(key string) (string, bool) {
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if strings.HasPrefix(key, t.prefix) {
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return t.systemBackwardTranslator(key), true
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}
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return key, false
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}
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func TransformIfSystem(key []byte) []byte {
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for _, transformer := range transformers {
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key, transformed := transformer.transformIfSystem(key)
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if transformed {
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return key
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}
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}
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return key
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}
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func BackwardTransformIfSystem(key string) string {
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for _, transformer := range transformers {
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key, transformed := transformer.backwardTransformIfSystem(key)
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if transformed {
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return key
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}
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}
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return key
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}
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func title(str string) string {
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if str == "" {
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return ""
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}
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r, size := utf8.DecodeRuneInString(str)
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r0 := unicode.ToTitle(r)
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return string(r0) + str[size:]
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}
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func PrepareExpirationHeader(ctx context.Context, p *pool.Pool, headers map[string]string, now time.Time) error {
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formatsNum := 0
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index := -1
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for i, transformer := range transformers {
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if transformer.existsExpirationAttributes(headers) {
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formatsNum++
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index = i
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}
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}
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switch formatsNum {
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case 0:
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return nil
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case 1:
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epochDuration, err := GetEpochDurations(ctx, p)
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if err != nil {
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return fmt.Errorf("couldn't get epoch durations from network info: %w", err)
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}
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return transformers[index].prepareExpirationHeader(headers, epochDuration, now)
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default:
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return errors.New("both deprecated and new system attributes formats are used, please use only one")
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}
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}
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func (t systemTransformer) prepareExpirationHeader(headers map[string]string, epochDurations *EpochDurations, now time.Time) error {
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expirationInEpoch := headers[t.expirationEpochAttr()]
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if timeRFC3339, ok := headers[t.expirationRFC3339Attr()]; ok {
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expTime, err := time.Parse(time.RFC3339, timeRFC3339)
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if err != nil {
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return fmt.Errorf("couldn't parse value %s of header %s", timeRFC3339, t.expirationRFC3339Attr())
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}
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if expTime.Before(now) {
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return fmt.Errorf("value %s of header %s must be in the future", timeRFC3339, t.expirationRFC3339Attr())
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}
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t.updateExpirationHeader(headers, epochDurations, expTime.Sub(now))
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delete(headers, t.expirationRFC3339Attr())
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}
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if timestamp, ok := headers[t.expirationTimestampAttr()]; ok {
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value, err := strconv.ParseInt(timestamp, 10, 64)
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if err != nil {
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return fmt.Errorf("couldn't parse value %s of header %s", timestamp, t.expirationTimestampAttr())
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}
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expTime := time.Unix(value, 0)
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if expTime.Before(now) {
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return fmt.Errorf("value %s of header %s must be in the future", timestamp, t.expirationTimestampAttr())
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}
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t.updateExpirationHeader(headers, epochDurations, expTime.Sub(now))
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delete(headers, t.expirationTimestampAttr())
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}
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if duration, ok := headers[t.expirationDurationAttr()]; ok {
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expDuration, err := time.ParseDuration(duration)
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if err != nil {
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return fmt.Errorf("couldn't parse value %s of header %s", duration, t.expirationDurationAttr())
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}
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if expDuration <= 0 {
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return fmt.Errorf("value %s of header %s must be positive", expDuration, t.expirationDurationAttr())
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}
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t.updateExpirationHeader(headers, epochDurations, expDuration)
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delete(headers, t.expirationDurationAttr())
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}
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if expirationInEpoch != "" {
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expEpoch, err := strconv.ParseUint(expirationInEpoch, 10, 64)
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if err != nil {
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return fmt.Errorf("parse expiration epoch '%s': %w", expirationInEpoch, err)
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}
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if expEpoch < epochDurations.CurrentEpoch {
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return fmt.Errorf("expiration epoch '%d' must be greater than current epoch '%d'", expEpoch, epochDurations.CurrentEpoch)
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}
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headers[t.expirationEpochAttr()] = expirationInEpoch
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}
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return nil
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}
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func (t systemTransformer) updateExpirationHeader(headers map[string]string, durations *EpochDurations, expDuration time.Duration) {
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epochDuration := uint64(durations.MsPerBlock) * durations.BlockPerEpoch
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currentEpoch := durations.CurrentEpoch
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numEpoch := uint64(expDuration.Milliseconds()) / epochDuration
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if uint64(expDuration.Milliseconds())%epochDuration != 0 {
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numEpoch++
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}
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expirationEpoch := uint64(math.MaxUint64)
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if numEpoch < math.MaxUint64-currentEpoch {
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expirationEpoch = currentEpoch + numEpoch
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}
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headers[t.expirationEpochAttr()] = strconv.FormatUint(expirationEpoch, 10)
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}
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