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// Copyright The Notary Project Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package x509
import (
"crypto/x509"
"encoding/pem"
"os"
)
// ReadCertificateFile reads a certificate PEM or DER file.
func ReadCertificateFile(path string) ([]*x509.Certificate, error) {
data, err := os.ReadFile(path)
if err != nil {
return nil, err
}
return parseCertificates(data)
}
// parseCertificates parses certificates from either PEM or DER data
// returns an empty list if no certificates are found
func parseCertificates(data []byte) ([]*x509.Certificate, error) {
var certs []*x509.Certificate
block, rest := pem.Decode(data)
if block == nil {
// data may be in DER format
derCerts, err := x509.ParseCertificates(data)
if err != nil {
return nil, err
}
certs = append(certs, derCerts...)
} else {
// data is in PEM format
for block != nil {
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, err
}
certs = append(certs, cert)
block, rest = pem.Decode(rest)
}
}
return certs, nil
}
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