103 lines
3 KiB
Go
103 lines
3 KiB
Go
/*
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Copyright CAcert Inc.
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SPDX-License-Identifier: Apache-2.0
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package services
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import (
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"fmt"
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"log"
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"os"
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"strings"
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"github.com/knadh/koanf"
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"github.com/knadh/koanf/parsers/toml"
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"github.com/knadh/koanf/providers/confmap"
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"github.com/knadh/koanf/providers/env"
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"github.com/knadh/koanf/providers/file"
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"github.com/knadh/koanf/providers/posflag"
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"github.com/spf13/pflag"
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)
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const (
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defaultServerPort = 4000
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defaultFile = "resource_app.toml"
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)
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var DefaultConfiguration = map[string]interface{}{
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"server.bind_address": "",
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"server.name": "app.cacert.localhost",
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"server.port": defaultServerPort,
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"server.key": "certs/app.cacert.localhost.key",
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"server.certificate": "certs/app.cacert.localhost.crt.pem",
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"oidc.server": "https://auth.cacert.localhost:4444/",
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"session.path": "sessions/app",
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"i18n.languages": []string{"en", "de"},
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"log.level": "info",
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"log.json": true,
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}
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func ConfigureApplication(
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appName string,
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defaultConfig map[string]interface{},
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) (*koanf.Koanf, error) {
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f := pflag.NewFlagSet("config", pflag.ContinueOnError)
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f.Usage = func() {
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log.Print(f.FlagUsages())
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os.Exit(0)
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}
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f.StringSlice(
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"conf",
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[]string{fmt.Sprintf("%s.toml", strings.ToLower(appName))},
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"path to one or more .toml files",
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)
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var err error
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if err = f.Parse(os.Args[1:]); err != nil {
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return nil, fmt.Errorf("could not parse command line arguments: %w", err)
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}
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config := koanf.New(".")
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_ = config.Load(confmap.Provider(defaultConfig, "."), nil)
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if err = config.Load(file.Provider(defaultFile), toml.Parser()); err != nil && !os.IsNotExist(err) {
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return nil, fmt.Errorf("could not load configuration from file %s: %w", defaultFile, err)
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}
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cFiles, _ := f.GetStringSlice("conf")
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for _, c := range cFiles {
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if err = config.Load(file.Provider(c), toml.Parser()); err != nil {
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return nil, fmt.Errorf("error loading configuration from file %s: %w", c, err)
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}
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}
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if err = config.Load(posflag.Provider(f, ".", config), nil); err != nil {
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return nil, fmt.Errorf("error loading configuration from command line: %w", err)
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}
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prefix := fmt.Sprintf("%s_", strings.ToUpper(appName))
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if err = config.Load(env.Provider(prefix, ".", func(s string) string {
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return strings.ReplaceAll(strings.ToLower(strings.TrimPrefix(s, prefix)), "_", ".")
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}), nil); err != nil {
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return nil, fmt.Errorf("error loading configuration from environment variables: %w", err)
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}
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return config, nil
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}
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