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parser.go
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parser.go
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// Package keyparser extracts public keys from code.
package keyparser
import (
"bufio"
"io"
"strings"
)
const (
rsaBegin = "BEGIN"
rsaEnd = "END"
rsaSep = "-----"
)
func isBegin(s string) bool {
if !strings.Contains(s, rsaSep) {
return false
}
return strings.Contains(s, rsaBegin)
}
func isEnd(s string) bool {
if !strings.Contains(s, rsaSep) {
return false
}
return strings.Contains(s, rsaEnd)
}
// cleanHeader cleans out any suffix from header.
//
// If s is not header, s is returned unchanged.
func cleanHeader(s string) string {
if !strings.HasPrefix(s, rsaSep) {
return s
}
idx := strings.LastIndex(s, rsaSep)
if idx <= 0 {
return s
}
return s[:idx+len(rsaSep)]
}
// Extract public keys from C++ code in r to w.
func Extract(r io.Reader, w io.Writer) error {
s := bufio.NewScanner(r)
var (
parts []string
body bool
b strings.Builder
)
for s.Scan() {
text := strings.TrimSuffix(
strings.TrimSpace(s.Text()), `\n\`,
)
text = cleanHeader(text)
if isBegin(text) {
// Public key started.
body = true
}
if body {
parts = append(parts, text)
}
if isEnd(text) {
// Public key completed.
// Writing single public key to w.
for _, part := range parts {
b.WriteString(part)
b.WriteRune('\n')
}
if _, err := io.WriteString(w, b.String()); err != nil {
return err
}
// Reset state.
b.Reset()
body = false
parts = parts[:0]
}
}
if s.Err() != nil {
return s.Err()
}
return nil
}