frostfs-http-gw/uploader/filter.go

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package uploader
import (
"bytes"
"github.com/valyala/fasthttp"
"go.uber.org/zap"
)
const (
userAttributeHeaderPrefix = "X-Attribute-"
systemAttributePrefix = "__NEOFS__"
)
var neofsAttributeHeaderPrefixes = [...][]byte{[]byte("Neofs-"), []byte("NEOFS-"), []byte("neofs-")}
func systemTranslator(key, prefix []byte) []byte {
// replace specified prefix with `__NEOFS__`
key = bytes.Replace(key, prefix, []byte(systemAttributePrefix), 1)
// replace `-` with `_`
key = bytes.ReplaceAll(key, []byte("-"), []byte("_"))
// replace with uppercase
return bytes.ToUpper(key)
}
func filterHeaders(l *zap.Logger, header *fasthttp.RequestHeader) map[string]string {
result := make(map[string]string)
prefix := []byte(userAttributeHeaderPrefix)
header.VisitAll(func(key, val []byte) {
// checks that key and val not empty
if len(key) == 0 || len(val) == 0 {
return
}
// checks that key has attribute prefix
if !bytes.HasPrefix(key, prefix) {
return
}
// removing attribute prefix
key = bytes.TrimPrefix(key, prefix)
// checks that it's a system NeoFS header
for _, system := range neofsAttributeHeaderPrefixes {
if bytes.HasPrefix(key, system) {
key = systemTranslator(key, system)
break
}
}
// checks that attribute key not empty
if len(key) == 0 {
return
}
// make string representation of key / val
k, v := string(key), string(val)
result[k] = v
l.Debug("add attribute to result object",
zap.String("key", k),
zap.String("val", v))
})
return result
}