/*
Copyright 2023 The Crossplane 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 oci

import (
	"crypto/x509"
	"os"
	"path/filepath"

	"github.com/crossplane/crossplane-runtime/pkg/errors"
)

// ParseCertificatesFromPath parses PEM file containing extra x509
// certificates(s) and combines them with the built in root CA CertPool.
func ParseCertificatesFromPath(path string) (*x509.CertPool, error) {
	// Get the SystemCertPool, continue with an empty pool on error
	rootCAs, _ := x509.SystemCertPool()
	if rootCAs == nil {
		rootCAs = x509.NewCertPool()
	}

	// Read in the cert file
	certs, err := os.ReadFile(filepath.Clean(path))
	if err != nil {
		return nil, errors.Wrapf(err, "Failed to append %q to RootCAs", path)
	}

	// Append our cert to the system pool
	if ok := rootCAs.AppendCertsFromPEM(certs); !ok {
		return nil, errors.Errorf("No certificates could be parsed from %q", path)
	}

	return rootCAs, nil
}