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47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
package labels
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import (
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"errors"
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)
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const (
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// MaxLength is the maximum length we allow for labels.
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MaxLength = 500
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// Reserved is used as a prefix to separate labels that are created by
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// loopd from those created by users.
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Reserved = "[reserved]"
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)
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var (
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// ErrLabelTooLong is returned when a label exceeds our length limit.
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ErrLabelTooLong = errors.New("label exceeds maximum length")
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// ErrReservedPrefix is returned when a label contains the prefix
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// which is reserved for internally produced labels.
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ErrReservedPrefix = errors.New("label contains reserved prefix")
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)
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// Validate checks that a label is of appropriate length and is not in our list
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// of reserved labels.
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func Validate(label string) error {
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if len(label) > MaxLength {
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return ErrLabelTooLong
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}
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// If the label is shorter than our reserved prefix, it cannot contain
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// it.
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if len(label) < len(Reserved) {
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return nil
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}
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// Check if our label begins with our reserved prefix. We don't mind if
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// it has our reserved prefix in another case, we just need to be able
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// to reserve a subset of labels with this prefix.
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if label[0:len(Reserved)] == Reserved {
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return ErrReservedPrefix
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}
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return nil
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}
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