mirror of
https://github.com/foxcpp/maddy.git
synced 2025-04-03 05:07:38 +03:00
67 lines
1.9 KiB
Go
67 lines
1.9 KiB
Go
/*
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Maddy Mail Server - Composable all-in-one email server.
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Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package parser
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import (
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"os"
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"regexp"
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"strings"
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)
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func expandEnvironment(nodes []Node) []Node {
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// If nodes is nil - don't replace with empty slice, as nil indicates "no
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// block".
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if nodes == nil {
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return nil
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}
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replacer := buildEnvReplacer()
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newNodes := make([]Node, 0, len(nodes))
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for _, node := range nodes {
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node.Name = removeUnexpandedEnvvars(replacer.Replace(node.Name))
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newArgs := make([]string, 0, len(node.Args))
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for _, arg := range node.Args {
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newArgs = append(newArgs, removeUnexpandedEnvvars(replacer.Replace(arg)))
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}
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node.Args = newArgs
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node.Children = expandEnvironment(node.Children)
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newNodes = append(newNodes, node)
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}
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return newNodes
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}
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var unixEnvvarRe = regexp.MustCompile(`{env:([^\$]+)}`)
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func removeUnexpandedEnvvars(s string) string {
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s = unixEnvvarRe.ReplaceAllString(s, "")
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return s
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}
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func buildEnvReplacer() *strings.Replacer {
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env := os.Environ()
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pairs := make([]string, 0, len(env)*4)
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for _, entry := range env {
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parts := strings.SplitN(entry, "=", 2)
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key := parts[0]
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value := parts[1]
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pairs = append(pairs, "{env:"+key+"}", value)
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}
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return strings.NewReplacer(pairs...)
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}
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