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config.go
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config.go
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/*
Artisan Core - Automation Manager
Copyright (C) 2022-Present SouthWinds Tech Ltd - www.southwinds.io
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package conf
import (
"regexp"
"strings"
)
// Configuration represent a source of environment variables
type Configuration interface {
Get(key string) string
Set(key, value string)
Merge(s Configuration)
MergeMap(m map[string]string)
Append(m map[string]string) Configuration
Vars() map[string]string
Replace()
Slice() []string
String() string
}
// ReplaceVar recursively replaces any variables in the text string using values provided by the config source
func ReplaceVar(text string, conf Configuration) string {
evExpression := regexp.MustCompile("\\${(.*?)}")
matches := evExpression.FindAllString(text, -1)
// if we have matches
if matches != nil {
for _, match := range matches {
// get the name of the environment variable i.e. the name part in "${name}"
name := match[2 : len(match)-1]
// get the value of the variable
value := conf.Get(name)
if len(value) > 0 {
// check if the value contains env variables
submatches := evExpression.FindAllString(value, -1)
for range submatches {
value = ReplaceVar(value, conf)
}
text = strings.Replace(text, match, value, -1)
}
}
}
return text
}