78 lines
1.7 KiB
Go
78 lines
1.7 KiB
Go
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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-api-go/v2/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.
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func ParseV2Attributes(attrs []string, excl []string) ([]*netmap.Attribute, 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.Attribute, len(attrs))
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for i := range attrs {
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line := strings.Trim(attrs[i], pairSeparator)
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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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if at, ok := cache[key]; ok && at.GetValue() != 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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attribute := new(netmap.Attribute)
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attribute.SetKey(key)
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attribute.SetValue(value)
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if parentKey != "" {
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attribute.SetParents([]string{parentKey})
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}
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parentKey = key
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cache[key] = attribute
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}
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}
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result := make([]*netmap.Attribute, 0, len(cache))
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for _, v := range cache {
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result = append(result, v)
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}
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return result, nil
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}
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