frp/pkg/config/value.go

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// Copyright 2020 The frp Authors
//
// 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 config
import (
"bytes"
"os"
"strings"
"text/template"
)
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var glbEnvs map[string]string
func init() {
glbEnvs = make(map[string]string)
envs := os.Environ()
for _, env := range envs {
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pair := strings.SplitN(env, "=", 2)
if len(pair) != 2 {
continue
}
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glbEnvs[pair[0]] = pair[1]
}
}
type Values struct {
Envs map[string]string // environment vars
}
func GetValues() *Values {
return &Values{
Envs: glbEnvs,
}
}
func RenderContent(in []byte) (out []byte, err error) {
tmpl, errRet := template.New("frp").Parse(string(in))
if errRet != nil {
err = errRet
return
}
buffer := bytes.NewBufferString("")
v := GetValues()
err = tmpl.Execute(buffer, v)
if err != nil {
return
}
out = buffer.Bytes()
return
}
func GetRenderedConfFromFile(path string) (out []byte, err error) {
var b []byte
b, err = os.ReadFile(path)
if err != nil {
return
}
out, err = RenderContent(b)
return
}