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source.go
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source.go
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/*
* Copyright (c) 2018. Abstrium SAS <team (at) pydio.com>
* This file is part of Pydio Cells.
*
* Pydio Cells 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.
*
* Pydio Cells 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 Pydio Cells. If not, see <http://www.gnu.org/licenses/>.
*
* The latest code can be found at <https://pydio.com>.
*/
// Package envvar implements Pydio specific interface for dynamic configurations that are backed by OS environment variables.
package envvar
import (
"crypto/md5"
"fmt"
"os"
"strings"
"time"
json "github.com/pydio/cells/x/jsonx"
"github.com/imdario/mergo"
"github.com/pydio/go-os/config"
)
type source struct {
prefix string
opts config.SourceOptions
}
func (s *source) String() string {
return "envvar"
}
// Read checks all environment variables and builds a JSON representation
// of all environment variables that have this source prefix.
// Various env variable with valid prefix are merged in a single JSON tree thanks to mergo.
// The JSON tree is built by removing the prefix and then adding a level for each token of the var name
//
// For instance PYDIO_DB_LOGIN="user", with prefix pydio, will produce following JSON data:
// {"db":{"login":"user"}}
func (s *source) Read() (*config.ChangeSet, error) {
// A Key value tree that will
var changes map[string]interface{}
for _, env := range os.Environ() {
if s.prefix != "" {
notFound := true
if match, ok := matchPrefix(s.prefix, env); ok {
env = strings.TrimPrefix(env, match)
notFound = false
}
if notFound {
continue
}
}
pair := strings.SplitN(env, "=", 2)
value := pair[1]
keys := strings.Split(strings.ToLower(pair[0]), "_")
reverse(keys)
tmp := make(map[string]interface{})
for i, k := range keys {
if i == 0 {
tmp[k] = value
continue
}
tmp = map[string]interface{}{k: tmp}
}
// Dynamically enriches the key / value tree by merging with already existing values.
if err := mergo.Map(&changes, tmp); err != nil {
return nil, err
}
}
b, err := json.Marshal(changes)
if err != nil {
return nil, err
}
h := md5.New()
h.Write(b)
checksum := fmt.Sprintf("%x", h.Sum(nil))
return &config.ChangeSet{
Data: b,
Checksum: checksum,
Timestamp: time.Now(),
Source: s.String(),
}, nil
}
func NewSource(opts ...config.SourceOption) config.Source {
var options config.SourceOptions
for _, o := range opts {
o(&options)
}
if len(options.Name) == 0 {
options.Name = config.DefaultSourceName
}
return &source{
prefix: options.Name + "_",
opts: options,
}
}
func (s *source) Watch() (config.SourceWatcher, error) {
return nil, nil
}
/* Helper functions */
func matchPrefix(p string, s string) (string, bool) {
if strings.HasPrefix(s, p) {
return p, true
}
return "", false
}
func reverse(ss []string) {
for i := len(ss)/2 - 1; i >= 0; i-- {
opp := len(ss) - 1 - i
ss[i], ss[opp] = ss[opp], ss[i]
}
}