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annotate cmd/sievemgr/internal/config/parser.go @ 22:fc5e6970a0d5 default tip

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Add support for specifying an authorization identity on the command line
author Guido Berhoerster <guido+sievemgr@berhoerster.name>
date Wed, 17 Feb 2021 07:50:55 +0100
parents 854167f55839
children
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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 "fmt"
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26 "strconv"
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27 )
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28
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29 type parser struct {
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30 s *scanner
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31 }
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32
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33 func (p *parser) scanType(expectedTok token) (string, error) {
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34 tok, lit, err := p.s.scan()
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35 if err != nil {
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36 return lit, NewParserError(err.Error(), p.s.line)
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37 } else if tok != expectedTok {
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38 return lit, NewParserError(fmt.Sprintf("expected %s, got %s %q", expectedTok, tok, lit), p.s.line)
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39 }
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40 return lit, nil
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41 }
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42
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43 func (p *parser) validateAccount(acct *Account) error {
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44 if acct.Host == "" {
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45 return NewParserError(fmt.Sprintf("no host specified for account %q",
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46 acct.Name), 0)
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47 } else if acct.User == "" {
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48 return NewParserError(fmt.Sprintf("no user specified for account %q",
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49 acct.Name), 0)
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50 }
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51 return nil
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52 }
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53
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54 func (p *parser) parse(conf *Configuration) error {
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55 var acct *Account
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56 var isDefault bool
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57 var tok token
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58 var lit string
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59 var err error
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60 parsing:
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61 for {
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62 tok, lit, err = p.s.scan()
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63 if err != nil {
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64 err = NewParserError(err.Error(), p.s.line)
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65 break parsing
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66 }
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67 if tok == tokenIllegal {
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68 err = NewParserError(fmt.Sprintf("illegal token %q", lit), p.s.line)
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69 break parsing
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70 } else if tok == tokenEOF {
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71 break parsing
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72 } else if tok != tokenIdent {
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73 err = NewParserError(fmt.Sprintf("expected identifier, got %s %q", tok, lit), p.s.line)
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74 break parsing
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75 }
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76 switch lit {
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77 case "account":
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78 if acct != nil {
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79 if err = p.validateAccount(acct); err != nil {
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80 break parsing
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81 }
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82 conf.Accounts = append(conf.Accounts, acct)
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83 if isDefault {
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84 conf.Default = acct
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85 isDefault = false
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86 }
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87 }
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88
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89 // account name
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90 if lit, err = p.scanType(tokenString); err != nil {
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91 break parsing
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92 }
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93 acct = &Account{
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94 Name: lit,
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95 }
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96 case "default":
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97 isDefault = true
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98 case "host":
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99 if lit, err = p.scanType(tokenString); err != nil {
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100 break parsing
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101 }
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102 acct.Host = lit
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103 case "port":
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104 if lit, err = p.scanType(tokenNumber); err != nil {
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105 break parsing
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106 }
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107 var port int
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108 if port, err = strconv.Atoi(lit); err != nil {
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109 err = NewParserError(fmt.Sprintf("failed to parse port: %s", err), p.s.line)
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110 break parsing
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111 } else if port < 1 || port > 65535 {
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112 err = NewParserError(fmt.Sprintf("invalid port number %d", port), p.s.line)
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113 break parsing
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114 }
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115 acct.Port = lit
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116 case "user":
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117 if lit, err = p.scanType(tokenString); err != nil {
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118 break parsing
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119 }
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120 acct.User = lit
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121 case "pass":
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122 if lit, err = p.scanType(tokenString); err != nil {
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123 break parsing
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124 }
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125 acct.Password = lit
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126 case "insecure":
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127 acct.Insecure = true
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128 default:
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129 err = NewParserError(fmt.Sprintf("unknown %s: %q", tok, lit), p.s.line)
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130 break parsing
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131 }
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132 }
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133 if err != nil {
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134 return err
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135 }
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136 if acct != nil {
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137 if err = p.validateAccount(acct); err != nil {
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138 return err
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139 }
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140 conf.Accounts = append(conf.Accounts, acct)
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141 if isDefault {
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142 conf.Default = acct
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143 }
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144 }
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145
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146 return nil
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147 }