github.com/greenpau/go-authcrunch@v1.1.4/pkg/util/file/utils.go (about)

     1  // Copyright 2022 Paul Greenberg greenpau@outlook.com
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package file
    16  
    17  import (
    18  	"bufio"
    19  	"bytes"
    20  	"fmt"
    21  	"io/ioutil"
    22  	"os"
    23  	"path/filepath"
    24  	"strings"
    25  )
    26  
    27  // ReadCertFile reads certificate files.
    28  func ReadCertFile(filePath string) (string, error) {
    29  	var buffer bytes.Buffer
    30  	var RecordingEnabled bool
    31  	fileHandle, err := os.Open(filePath)
    32  	if err != nil {
    33  		return "", err
    34  	}
    35  	defer fileHandle.Close()
    36  
    37  	scanner := bufio.NewScanner(fileHandle)
    38  	for scanner.Scan() {
    39  		line := scanner.Text()
    40  		if strings.HasPrefix(line, "-----") {
    41  			if strings.Contains(line, "BEGIN CERTIFICATE") {
    42  				RecordingEnabled = true
    43  				continue
    44  			}
    45  			if strings.Contains(line, "END CERTIFICATE") {
    46  				break
    47  			}
    48  		}
    49  		if RecordingEnabled {
    50  			buffer.WriteString(strings.TrimSpace(line))
    51  		}
    52  	}
    53  
    54  	if err := scanner.Err(); err != nil {
    55  		return "", err
    56  	}
    57  
    58  	return buffer.String(), nil
    59  }
    60  
    61  // ReadFile reads a file.
    62  func ReadFile(filePath string) (string, error) {
    63  	var buffer bytes.Buffer
    64  	fileHandle, err := os.Open(filePath)
    65  	if err != nil {
    66  		return "", err
    67  	}
    68  	defer fileHandle.Close()
    69  
    70  	scanner := bufio.NewScanner(fileHandle)
    71  	for scanner.Scan() {
    72  		line := scanner.Text()
    73  		buffer.WriteString(strings.TrimSpace(line))
    74  	}
    75  
    76  	if err := scanner.Err(); err != nil {
    77  		return "", err
    78  	}
    79  
    80  	return buffer.String(), nil
    81  }
    82  
    83  func expandHomePath(fp string) (string, error) {
    84  	if fp == "" {
    85  		return fp, fmt.Errorf("cannot expand an empty string")
    86  	}
    87  	if fp[0] != '~' {
    88  		return fp, nil
    89  	}
    90  	hd, err := os.UserHomeDir()
    91  	if err != nil {
    92  		return fp, err
    93  	}
    94  	fp = filepath.Join(hd, fp[1:])
    95  	return fp, nil
    96  }
    97  
    98  // ReadFileBytes expands home directory and reads a file.
    99  func ReadFileBytes(fp string) ([]byte, error) {
   100  	if fp == "" {
   101  		return nil, fmt.Errorf("cannot expand an empty string")
   102  	}
   103  	fp, err := expandHomePath(fp)
   104  	if err != nil {
   105  		return nil, err
   106  	}
   107  	return ioutil.ReadFile(fp)
   108  }
   109  
   110  // ExpandPath expands file system path.
   111  func ExpandPath(s string) string {
   112  	p, err := expandHomePath(s)
   113  	if err != nil {
   114  		return s
   115  	}
   116  	return p
   117  }