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package proto
import (
"encoding/base64"
"fmt"
"sort"
"strings"
"unicode"
"golang.org/x/text/encoding/charmap"
)
// EncodeParams converts params map into a sorted base64-encoded string using Windows-1251 encoding.
func EncodeParams(params map[string]string) (string, error) {
keys := make([]string, 0, len(params))
for k := range params {
keys = append(keys, k)
}
sort.Strings(keys)
var sb strings.Builder
for i, k := range keys {
if i > 0 {
sb.WriteByte('|')
}
sb.WriteString(k)
sb.WriteByte('=')
sb.WriteString(params[k])
}
sb.WriteByte('|')
enc := charmap.Windows1251.NewEncoder()
encoded, err := enc.String(sb.String())
if err != nil {
return "", fmt.Errorf("encode params: %w", err)
}
return base64.StdEncoding.EncodeToString([]byte(encoded)), nil
}
// DecodeResponse decodes base64-encoded Windows-1251 text to UTF-8 and removes control characters.
func DecodeResponse(data string) (string, error) {
raw, err := base64.StdEncoding.DecodeString(strings.TrimSpace(data))
if err != nil {
return "", fmt.Errorf("base64 decode: %w", err)
}
decoded, err := charmap.Windows1251.NewDecoder().Bytes(raw)
if err != nil {
return "", fmt.Errorf("decode charset: %w", err)
}
cleaned := strings.Map(func(r rune) rune {
if unicode.IsPrint(r) || r == '\n' || r == '\r' || r == '\t' {
return r
}
return -1
}, string(decoded))
return cleaned, nil
}
// BuildRequest returns byte slice representing the command and parameters.
func BuildRequest(command, encodedParams string, quit bool) []byte {
if quit {
return []byte(fmt.Sprintf("%s %s\nQUIT\n", command, encodedParams))
}
return []byte(fmt.Sprintf("%s %s\n", command, encodedParams))
}
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