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comparison cmd/sievemgr/internal/config/parser.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
parents
children 854167f55839
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4:f925f15d8ce5 5:4dff4c3f0fbb
1 // Copyright (C) 2020 Guido Berhoerster <guido+sievemgr@berhoerster.name>
2 //
3 // Permission is hereby granted, free of charge, to any person obtaining
4 // a copy of this software and associated documentation files (the
5 // "Software"), to deal in the Software without restriction, including
6 // without limitation the rights to use, copy, modify, merge, publish,
7 // distribute, sublicense, and/or sell copies of the Software, and to
8 // permit persons to whom the Software is furnished to do so, subject to
9 // the following conditions:
10 //
11 // The above copyright notice and this permission notice shall be included
12 // in all copies or substantial portions of the Software.
13 //
14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
15 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17 // IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
18 // CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
19 // TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
20 // SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21
22 package config
23
24 import (
25 "fmt"
26 "strconv"
27 )
28
29 type parser struct {
30 s *scanner
31 }
32
33 func (p *parser) scanType(expectedTok token) (string, error) {
34 tok, lit, err := p.s.scan()
35 if err != nil {
36 return lit, NewParserError(err.Error(), p.s.line)
37 } else if tok != expectedTok {
38 return lit, NewParserError(fmt.Sprintf("expected %s, got %s %q", expectedTok, tok, lit), p.s.line)
39 }
40 return lit, nil
41 }
42
43 func (p *parser) validateAccount(acct *Account) error {
44 if acct.Host == "" {
45 return NewParserError(fmt.Sprintf("no host specified for account %q",
46 acct.Name), 0)
47 } else if acct.User == "" {
48 return NewParserError(fmt.Sprintf("no user specified for account %q",
49 acct.Name), 0)
50 }
51 return nil
52 }
53
54 func (p *parser) parse(conf *Configuration) error {
55 var acct *Account
56 var isDefault bool
57 var tok token
58 var lit string
59 var err error
60 parsing:
61 for {
62 tok, lit, err = p.s.scan()
63 if err != nil {
64 err = NewParserError(err.Error(), p.s.line)
65 break parsing
66 }
67 if tok == tokenIllegal {
68 err = NewParserError(fmt.Sprintf("illegal token %q", lit), p.s.line)
69 break parsing
70 } else if tok == tokenEOF {
71 break parsing
72 } else if tok != tokenIdent {
73 err = NewParserError(fmt.Sprintf("expected identifier, got %s %q", tok, lit), p.s.line)
74 break parsing
75 }
76 switch lit {
77 case "account":
78 if acct != nil {
79 if err = p.validateAccount(acct); err != nil {
80 break parsing
81 }
82 conf.Accounts = append(conf.Accounts, acct)
83 if isDefault {
84 conf.Default = acct
85 isDefault = false
86 }
87 }
88
89 // account name
90 if lit, err = p.scanType(tokenString); err != nil {
91 break parsing
92 }
93 acct = &Account{
94 Name: lit,
95 Port: "4190",
96 }
97 case "default":
98 isDefault = true
99 case "host":
100 if lit, err = p.scanType(tokenString); err != nil {
101 break parsing
102 }
103 acct.Host = lit
104 case "port":
105 if lit, err = p.scanType(tokenNumber); err != nil {
106 break parsing
107 }
108 var port int
109 if port, err = strconv.Atoi(lit); err != nil {
110 err = NewParserError(fmt.Sprintf("failed to parse port: %s", err), p.s.line)
111 break parsing
112 } else if port < 1 || port > 65535 {
113 err = NewParserError(fmt.Sprintf("invalid port number %d", port), p.s.line)
114 break parsing
115 }
116 acct.Port = lit
117 case "user":
118 if lit, err = p.scanType(tokenString); err != nil {
119 break parsing
120 }
121 acct.User = lit
122 case "pass":
123 if lit, err = p.scanType(tokenString); err != nil {
124 break parsing
125 }
126 acct.Password = lit
127 case "insecure":
128 acct.Insecure = true
129 default:
130 err = NewParserError(fmt.Sprintf("unknown %s: %q", tok, lit), p.s.line)
131 break parsing
132 }
133 }
134 if err != nil {
135 return err
136 }
137 if acct != nil {
138 if err = p.validateAccount(acct); err != nil {
139 return err
140 }
141 conf.Accounts = append(conf.Accounts, acct)
142 if isDefault {
143 conf.Default = acct
144 }
145 }
146
147 return nil
148 }