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utils.go
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utils.go
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// Copyright 2022 Paul Greenberg greenpau@outlook.com
//
// 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 file
import (
"bufio"
"bytes"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
)
// ReadCertFile reads certificate files.
func ReadCertFile(filePath string) (string, error) {
var buffer bytes.Buffer
var RecordingEnabled bool
fileHandle, err := os.Open(filePath)
if err != nil {
return "", err
}
defer fileHandle.Close()
scanner := bufio.NewScanner(fileHandle)
for scanner.Scan() {
line := scanner.Text()
if strings.HasPrefix(line, "-----") {
if strings.Contains(line, "BEGIN CERTIFICATE") {
RecordingEnabled = true
continue
}
if strings.Contains(line, "END CERTIFICATE") {
break
}
}
if RecordingEnabled {
buffer.WriteString(strings.TrimSpace(line))
}
}
if err := scanner.Err(); err != nil {
return "", err
}
return buffer.String(), nil
}
// ReadFile reads a file.
func ReadFile(filePath string) (string, error) {
var buffer bytes.Buffer
fileHandle, err := os.Open(filePath)
if err != nil {
return "", err
}
defer fileHandle.Close()
scanner := bufio.NewScanner(fileHandle)
for scanner.Scan() {
line := scanner.Text()
buffer.WriteString(strings.TrimSpace(line))
}
if err := scanner.Err(); err != nil {
return "", err
}
return buffer.String(), nil
}
func expandHomePath(fp string) (string, error) {
if fp == "" {
return fp, fmt.Errorf("cannot expand an empty string")
}
if fp[0] != '~' {
return fp, nil
}
hd, err := os.UserHomeDir()
if err != nil {
return fp, err
}
fp = filepath.Join(hd, fp[1:])
return fp, nil
}
// ReadFileBytes expands home directory and reads a file.
func ReadFileBytes(fp string) ([]byte, error) {
if fp == "" {
return nil, fmt.Errorf("cannot expand an empty string")
}
fp, err := expandHomePath(fp)
if err != nil {
return nil, err
}
return ioutil.ReadFile(fp)
}
// ExpandPath expands file system path.
func ExpandPath(s string) string {
p, err := expandHomePath(s)
if err != nil {
return s
}
return p
}