121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
package attributes
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import (
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"errors"
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"fmt"
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"strings"
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"github.com/nspcc-dev/neofs-sdk-go/netmap"
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)
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const (
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pairSeparator = "/"
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keyValueSeparator = ":"
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)
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var (
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errEmptyChain = errors.New("empty attribute chain")
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errNonUniqueBucket = errors.New("attributes must contain unique keys")
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errUnexpectedKey = errors.New("attributes contain unexpected key")
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)
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// ParseV2Attributes parses strings like "K1:V1/K2:V2/K3:V3" into netmap
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// attributes. Supports escaped symbols "\:", "\/" and "\\".
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func ParseV2Attributes(attrs []string, excl []string) ([]netmap.NodeAttribute, error) {
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restricted := make(map[string]struct{}, len(excl))
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for i := range excl {
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restricted[excl[i]] = struct{}{}
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}
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cache := make(map[string]*netmap.NodeAttribute, len(attrs))
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result := make([]netmap.NodeAttribute, 0, len(attrs))
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for i := range attrs {
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line := strings.Trim(attrs[i], pairSeparator)
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line = replaceEscaping(line, false) // replaced escaped symbols with non-printable symbols
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chain := strings.Split(line, pairSeparator)
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if len(chain) == 0 {
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return nil, errEmptyChain
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}
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var parentKey string // backtrack parents in next pairs
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for j := range chain {
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pair := strings.Split(chain[j], keyValueSeparator)
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if len(pair) != 2 {
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return nil, fmt.Errorf("incorrect attribute pair %s", chain[j])
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}
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key := pair[0]
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value := pair[1]
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attribute, present := cache[key]
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if present && attribute.Value() != value {
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return nil, errNonUniqueBucket
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}
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if _, ok := restricted[key]; ok {
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return nil, errUnexpectedKey
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}
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if !present {
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result = append(result, netmap.NodeAttribute{})
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attribute = &result[len(result)-1]
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cache[key] = attribute
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// replace non-printable symbols with escaped symbols without escape character
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key = replaceEscaping(key, true)
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value = replaceEscaping(value, true)
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attribute.SetKey(key)
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attribute.SetValue(value)
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}
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if parentKey != "" {
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parentKeys := attribute.ParentKeys()
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if !hasString(parentKeys, parentKey) {
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attribute.SetParentKeys(append(parentKeys, parentKey)...)
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}
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}
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parentKey = key
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}
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}
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return result, nil
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}
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func replaceEscaping(target string, rollback bool) (s string) {
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const escChar = `\`
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var (
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oldPairSep = escChar + pairSeparator
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oldKVSep = escChar + keyValueSeparator
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oldEsc = escChar + escChar
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newPairSep = string(uint8(1))
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newKVSep = string(uint8(2))
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newEsc = string(uint8(3))
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)
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if rollback {
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oldPairSep, oldKVSep, oldEsc = newPairSep, newKVSep, newEsc
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newPairSep = pairSeparator
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newKVSep = keyValueSeparator
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newEsc = escChar
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}
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s = strings.ReplaceAll(target, oldEsc, newEsc)
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s = strings.ReplaceAll(s, oldPairSep, newPairSep)
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s = strings.ReplaceAll(s, oldKVSep, newKVSep)
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return
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}
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func hasString(lst []string, v string) bool {
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for i := range lst {
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if lst[i] == v {
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return true
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}
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}
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return false
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}
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