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annotate parser.go @ 12:66b46b3d73be default tip

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Handle capabilities sent by the server after negotiating a SASL security layer
author Guido Berhoerster <guido+managesieve@berhoerster.name>
date Tue, 09 Feb 2021 23:01:02 +0100
parents 6369453d47a3
children
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0
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1 // Copyright (C) 2020 Guido Berhoerster <guido+managesieve@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 managesieve
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23
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24 import (
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25 "strings"
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26 )
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27
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28 type response int
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29
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30 const (
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31 responseInvalid response = iota
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32 responseOk
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33 responseNo
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34 responseBye
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35 )
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36
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37 func lookupResponse(s string) response {
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38 switch s {
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39 case "OK":
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40 return responseOk
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41 case "NO":
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42 return responseNo
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43 case "BYE":
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44 return responseBye
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45 }
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46 return responseInvalid
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47 }
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48
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49 type reply struct {
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50 lines [][]*token
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51 resp response
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52 code string
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53 codeArgs []string
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54 msg string
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55 }
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56
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57 func parseCapabilities(r *reply) (map[string]string, error) {
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58 capa := make(map[string]string)
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59 for _, tokens := range r.lines {
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60 var k, v string
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61 if tokens[0].typ != tokenQuotedString &&
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62 tokens[0].typ != tokenLiteralString {
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63 return nil, ParserError("failed to parse capability name: expected string")
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64 }
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65 k = strings.ToUpper(tokens[0].literal)
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66
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67 if len(tokens) > 1 {
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68 if tokens[1].typ != tokenQuotedString &&
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69 tokens[1].typ != tokenLiteralString {
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70 return nil, ParserError("failed to parse capability value: expected string")
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71 }
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72 v = tokens[1].literal
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73 }
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74 capa[k] = v
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75 }
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76 return capa, nil
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77 }
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78
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79 type parser struct {
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80 s *scanner
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81 }
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82
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83 func (p *parser) isResponseLine(tokens []*token) bool {
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84 return tokens[0].typ == tokenAtom &&
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85 lookupResponse(tokens[0].literal) != responseInvalid
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86 }
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87
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88 func (p *parser) parseResponseLine(tokens []*token) (*reply, error) {
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89 var i int
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90 next := func() (*token, bool) {
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91 if i >= len(tokens) {
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92 return nil, false
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93 }
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94 tok := tokens[i]
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95 i++
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96 return tok, true
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97 }
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98
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99 // response
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100 tok, cont := next()
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101 r := &reply{resp: lookupResponse(tok.literal)}
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102
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103 // code starts with left parenthesis
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104 tok, cont = next()
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105 if !cont {
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106 // only response without code and/or message
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107 return r, nil
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108 }
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109 if tok.typ == tokenLeftParenthesis {
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110 // code atom
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111 tok, cont = next()
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112 if !cont || tok.typ != tokenAtom {
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113 return nil, ParserError("failed to parse response code: expected atom")
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114 }
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115 r.code = tok.literal
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116
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117 // followed by zero or more string arguments
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118 for {
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119 tok, cont = next()
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120 if !cont {
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121 return nil, ParserError("failed to parse response code: unexpected end of line")
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122 }
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123 if tok.typ != tokenQuotedString &&
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124 tok.typ != tokenLiteralString {
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125 break
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126 }
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127 r.codeArgs = append(r.codeArgs, tok.literal)
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128 }
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129
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130 // terminated by a right parenthesis
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131 if tok.typ != tokenRightParenthesis {
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132 return nil, ParserError("failed to parse response code: expected right parenthesis")
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133 }
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134
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135 tok, cont = next()
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136 if !cont {
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137 // response with code but no message
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138 return r, nil
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139 }
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140 }
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141
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142 // message string
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143 if tok.typ != tokenQuotedString &&
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144 tok.typ != tokenLiteralString {
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145 return nil, ParserError("failed to parse response message: expected string")
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146 }
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147 r.msg = strings.TrimSpace(tok.literal)
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148
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149 // end of line
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150 if _, cont = next(); cont {
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151 return nil, ParserError("failed to parse response line: unexpected trailing data")
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152 }
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153
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154 return r, nil
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155 }
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156
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157 func (p *parser) readLine() ([]*token, error) {
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158 tokens := make([]*token, 0)
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159 for {
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160 tok, err := p.s.scan()
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161 if err != nil {
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162 return nil, err
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163 }
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164 if tok.typ == tokenCRLF {
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165 break
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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166 }
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167 tokens = append(tokens, tok)
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168 }
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169
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170 return tokens, nil
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171 }
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172
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173 func (p *parser) readReply() (*reply, error) {
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174 var r *reply
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175 var lines [][]*token = make([][]*token, 0, 1)
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176 for {
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177 tokens, err := p.readLine()
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178 if err != nil {
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179 return nil, err
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180 }
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181 if len(tokens) == 0 {
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182 return nil, ParserError("unexpected empty line")
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183 }
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184 // check for response tokens
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185 if p.isResponseLine(tokens) {
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186 r, err = p.parseResponseLine(tokens)
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Guido Berhoerster <guido+managesieve@berhoerster.name>
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187 if err != nil {
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Guido Berhoerster <guido+managesieve@berhoerster.name>
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188 return nil, err
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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189 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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190 r.lines = lines
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Guido Berhoerster <guido+managesieve@berhoerster.name>
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191 break
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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192 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
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193 lines = append(lines, tokens)
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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194 }
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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195
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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196 return r, nil
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Guido Berhoerster <guido+managesieve@berhoerster.name>
parents:
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197 }