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annotate cmd/sievemgr/internal/config/scanner.go @ 5:4dff4c3f0fbb

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Introduce configuration file where account information is specified Introduce a configuration file where account information must be specified instead of passing it with each invocation on the command line. Each account has a name by which it can be selected and one may be specified as the default account. This is intended to improve usability for productive usage. Enforce strict permissions since passwords may be specified for non-interactive usage. Remove command-line flags for passing account information.
author Guido Berhoerster <guido+sievemgr@berhoerster.name>
date Tue, 03 Nov 2020 23:44:45 +0100
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5
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1 // Copyright (C) 2020 Guido Berhoerster <guido+sievemgr@berhoerster.name>
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2 //
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3 // Permission is hereby granted, free of charge, to any person obtaining
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4 // a copy of this software and associated documentation files (the
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5 // "Software"), to deal in the Software without restriction, including
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6 // without limitation the rights to use, copy, modify, merge, publish,
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7 // distribute, sublicense, and/or sell copies of the Software, and to
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8 // permit persons to whom the Software is furnished to do so, subject to
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9 // the following conditions:
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10 //
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11 // The above copyright notice and this permission notice shall be included
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12 // in all copies or substantial portions of the Software.
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13 //
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14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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17 // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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18 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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19 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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20 // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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21
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22 package config
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23
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24 import (
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25 "bufio"
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26 "fmt"
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27 "io"
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28 "strings"
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29 "unicode"
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30 )
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31
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32 type token int
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33
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34 const (
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35 tokenEOF token = -(iota + 1)
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36 tokenIllegal
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37 tokenIdent
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38 tokenNumber
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39 tokenString
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40 )
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41
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42 func (tok token) String() string {
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43 switch tok {
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44 case tokenIllegal:
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45 return "illegal"
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46 case tokenEOF:
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47 return "EOF"
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48 case tokenIdent:
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49 return "identifier"
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50 case tokenNumber:
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51 return "number"
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52 case tokenString:
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53 return "string"
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54 default:
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55 return "unknown"
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56 }
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57 }
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58
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59 func isWhitespaceRune(r rune) bool {
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60 return r == ' ' || r == '\t' || r == '\r' || r == '\n'
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61 }
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62
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63 func isIdentRune(r rune) bool {
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64 return r >= 'A' && r <= 'Z' || r >= 'a' && r <= 'z'
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65 }
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66
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67 func isNumberRune(r rune) bool {
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68 return r >= '0' && r <= '9'
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69 }
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70
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71 type scanner struct {
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72 br *bufio.Reader
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73 line int // line number for error messages
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74 r rune // last read rune
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75 rdSize int // last read size
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76 rdOffset int // offset from beginning of file
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77 }
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78
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79 func newScanner(br *bufio.Reader) *scanner {
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80 return &scanner{line: 1, br: br}
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81 }
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82
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83 func (s *scanner) read() error {
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84 var size int
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85 again:
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86 r, size, err := s.br.ReadRune()
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87 if err != nil {
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88 return err
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89 }
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90
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91 // skip over BOM at the beginning of the file
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92 if r == bom && s.rdOffset == 0 {
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93 s.rdOffset += size
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94 goto again
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95 }
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96
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97 if s.r == '\n' {
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98 s.line++
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99 }
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100
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101 s.r = r
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102 s.rdOffset += size
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103 s.rdSize = size
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104
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105 if r == unicode.ReplacementChar && size == 1 {
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106 return fmt.Errorf("illegal UTF-8 sequence")
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107 } else if r == 0 {
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108 return fmt.Errorf("illegal nul byte")
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109 }
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110 return nil
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111 }
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112
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113 func (s *scanner) unread() {
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114 if s.br.UnreadRune() != nil {
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115 return
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116 }
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117
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118 if b, _ := s.br.Peek(1); b[0] == '\n' {
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119 // moved back to the previous line
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120 s.line--
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121 }
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122
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123 s.r = 0
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124 s.rdOffset -= s.rdSize
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125 s.rdSize = 0
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126 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
127
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
128 func (s *scanner) skipWhitespace() error {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
129 for {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
130 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
131 break
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
132 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
133 return err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
134 } else if !isWhitespaceRune(s.r) {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
135 s.unread()
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
136 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
137 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
138 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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139 return nil
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
140 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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141
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
142 func (s *scanner) scanIdent() (token, string, error) {
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parents:
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143 var sb strings.Builder
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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144 for {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
145 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
146 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
147 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
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148 return tokenIllegal, "", err
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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149 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
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diff changeset
150 if isIdentRune(s.r) {
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parents:
diff changeset
151 sb.WriteRune(s.r)
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parents:
diff changeset
152 } else if isWhitespaceRune(s.r) {
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parents:
diff changeset
153 s.unread()
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
154 break
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parents:
diff changeset
155 } else {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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156 return tokenIllegal, "", fmt.Errorf("illegal rune in identifier: %q", s.r)
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parents:
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157 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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158 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
159 if sb.Len() == 0 {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
160 return tokenIllegal, "", fmt.Errorf("expected identifier, got %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
161 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
162 return tokenIdent, sb.String(), nil
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
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163 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
164
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parents:
diff changeset
165 func (s *scanner) scanNumber() (token, string, error) {
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parents:
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166 var sb strings.Builder
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
167 for {
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parents:
diff changeset
168 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
169 break
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
170 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
171 return tokenIllegal, "", err
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
172 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
173 if isNumberRune(s.r) {
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parents:
diff changeset
174 sb.WriteRune(s.r)
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parents:
diff changeset
175 } else if isWhitespaceRune(s.r) {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
176 s.unread()
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
177 break
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
178 } else {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
179 return tokenIllegal, "", fmt.Errorf("illegal rune in number: %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
180 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
181 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
182 if sb.Len() == 0 {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
183 return tokenIllegal, "", fmt.Errorf("expected number, got %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
184 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
185 return tokenNumber, sb.String(), nil
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
186 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
187
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
188 func (s *scanner) scanString() (token, string, error) {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
189 if err := s.read(); err == io.EOF {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
190 return tokenIllegal, "", fmt.Errorf("unexpected EOF")
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
191 } else if err != nil {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
192 return tokenIllegal, "", err
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
193 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
194
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
195 if s.r != '"' {
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
196 return tokenIllegal, "",
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
197 fmt.Errorf("expected '\"', got %q", s.r)
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
198 }
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
199
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
200 var sb strings.Builder
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
201 var inEscape bool
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
202 for {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
203 if err := s.read(); err == io.EOF {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
204 return tokenIllegal, "", fmt.Errorf("unterminated string")
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
205 } else if err != nil {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
206 return tokenIllegal, "", err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
207 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
208
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
209 if s.r == '\\' && !inEscape {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
210 inEscape = true
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
211 } else if s.r == '"' && !inEscape {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
212 break
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
213 } else {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
214 sb.WriteRune(s.r)
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
215 inEscape = false
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
216 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
217 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
218
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
219 return tokenString, sb.String(), nil
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
220 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
221
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
222 func (s *scanner) scan() (token, string, error) {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
223 if err := s.skipWhitespace(); err != nil {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
224 return tokenIllegal, "", err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
225 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
226
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
227 if err := s.read(); err == io.EOF {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
228 return tokenEOF, "", nil
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
229 } else if err != nil {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
230 return tokenIllegal, "", err
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
231 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
232 r := s.r
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
233 s.unread()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
234
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
235 switch {
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
236 case isIdentRune(r):
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Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
237 return s.scanIdent()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
238 case isNumberRune(r):
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
239 return s.scanNumber()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
240 case r == '"':
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
241 return s.scanString()
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
242 }
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
243 return tokenIllegal, string(r), nil
4dff4c3f0fbb Introduce configuration file where account information is specified
Guido Berhoerster <guido+sievemgr@berhoerster.name>
parents:
diff changeset
244 }