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package main
// handle all io and de/encoding of data
import (
"encoding/pem"
"errors"
"io/ioutil"
)
var (
ErrBlockNotFound = errors.New("block not found")
)
// load a pem section from a file
func readSectionFromFile(path, btype string) ([]byte, error) {
raw, err := readFile(path)
if err != nil { return raw, err }
return decodeSection(raw, btype)
}
// read a file completely and report possible errors
func readFile(path string) ([]byte, error) {
raw, err := ioutil.ReadFile(path)
if err != nil { return EmptyByteArray, err }
return raw, nil
}
// decode a pem encoded file and search for the specified section
func decodeSection(data []byte, btype string) ([]byte, error) {
rest := data
for len(rest) > 0 {
var block *pem.Block
block, rest = pem.Decode(rest)
if block.Type == btype {
return block.Bytes, nil
}
}
return EmptyByteArray, ErrBlockNotFound
}
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