/
shell.go
65 lines (57 loc) · 1.89 KB
/
shell.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
// Copyright 2019 Altinity Ltd and/or its affiliates. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"regexp"
"strings"
)
const shellEnvVarNameMaxLength int = 63
var shellEnvVarNameRegexp = regexp.MustCompile("^[A-Z]([_A-Z0-9]*[A-Z0-9])?$")
var shellEnvVarNameStartRegexp = regexp.MustCompile("^[A-Z]")
var shellEnvVarNameNotAllowedCharsRegexp = regexp.MustCompile("[^_A-Z0-9]")
var shellEnvVarNameReplaceCharsRegexp = regexp.MustCompile("[/]")
func BuildShellEnvVarName(str string) (string, bool) {
// Must be uppercase
str = strings.ToUpper(str)
// First char must comply to start regexp
for len(str) > 0 {
if shellEnvVarNameStartRegexp.MatchString(str) {
break
} else {
str = str[1:]
}
}
// Replace replaceable chars
str = shellEnvVarNameReplaceCharsRegexp.ReplaceAllString(str, "_")
// Remove not allowed chars
str = shellEnvVarNameNotAllowedCharsRegexp.ReplaceAllString(str, "")
// Must have limited length
if len(str) > shellEnvVarNameMaxLength {
str = str[0:shellEnvVarNameMaxLength]
}
if IsShellEnvVarName(str) {
return str, true
}
return "", false
}
// IsShellEnvVarName tests for a string that conforms to the definition of a shell ENV VAR name
func IsShellEnvVarName(value string) bool {
if len(value) > shellEnvVarNameMaxLength {
return false
}
if !shellEnvVarNameRegexp.MatchString(value) {
return false
}
return true
}