59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
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package lib
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import "bytes"
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import "fmt"
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import "regexp"
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func MetadataEncode (_metadata map[string]string) ([]byte, error) {
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_buffer := & bytes.Buffer {}
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for _key, _value := range _metadata {
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if ! metadataKeyRegex.MatchString (_key) {
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return nil, fmt.Errorf ("[2f761e02] invalid metadata key: `%s`", _key)
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}
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if _value == "" {
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continue
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}
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if ! metadataValueRegex.MatchString (_value) {
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return nil, fmt.Errorf ("[e8faf5bd] invalid metadata value: `%s`", _value)
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}
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_buffer.Write ([]byte (_key))
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_buffer.Write ([]byte (" : "))
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_buffer.Write ([]byte (_value))
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_buffer.Write ([]byte ("\n"))
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}
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_data := _buffer.Bytes ()
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return _data, nil
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}
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func MetadataDecode (_data []byte) ([][2]string, error) {
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_metadata := make ([][2]string, 0, 16)
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for _, _data := range bytes.Split (_data, []byte ("\n")) {
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if len (_data) == 0 {
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continue
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}
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_data := bytes.SplitN (_data, []byte (" : "), 2)
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if len (_data) == 2 {
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_metadata = append (_metadata, [2]string { string (_data[0]), string (_data[1]) })
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} else {
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return nil, fmt.Errorf ("[7cb30bf7] invalid metadata encoding")
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}
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}
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return _metadata, nil
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}
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var metadataKeyRegex *regexp.Regexp = regexp.MustCompile (`\A[a-z0-9](?:[a-z0-9-]?[a-z]+)*\z`)
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var metadataValueRegex *regexp.Regexp = regexp.MustCompile (`\A[[:graph:]](?: ?[[:graph:]]+)*\z`)
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