205 lines
6.1 KiB
Go
205 lines
6.1 KiB
Go
// Copyright or © or Copr. happyDNS (2020)
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//
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// contact@happydomain.org
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//
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// This software is a computer program whose purpose is to provide a modern
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// interface to interact with DNS systems.
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//
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// This software is governed by the CeCILL license under French law and abiding
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// by the rules of distribution of free software. You can use, modify and/or
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// redistribute the software under the terms of the CeCILL license as
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// circulated by CEA, CNRS and INRIA at the following URL
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// "http://www.cecill.info".
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//
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// As a counterpart to the access to the source code and rights to copy, modify
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// and redistribute granted by the license, users are provided only with a
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// limited warranty and the software's author, the holder of the economic
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// rights, and the successive licensors have only limited liability.
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//
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// In this respect, the user's attention is drawn to the risks associated with
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// loading, using, modifying and/or developing or reproducing the software by
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// the user in light of its specific status of free software, that may mean
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// that it is complicated to manipulate, and that also therefore means that it
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// is reserved for developers and experienced professionals having in-depth
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// computer knowledge. Users are therefore encouraged to load and test the
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// software's suitability as regards their requirements in conditions enabling
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// the security of their systems and/or data to be ensured and, more generally,
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// to use and operate it in the same conditions as regards security.
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//
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// The fact that you are presently reading this means that you have had
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// knowledge of the CeCILL license and that you accept its terms.
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package config // import "happydns.org/config"
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import (
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"crypto/rand"
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"flag"
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"fmt"
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"log"
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"net/url"
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"os"
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"path"
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"strings"
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"git.happydns.org/happydomain/storage"
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)
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// Options stores the configuration of the software.
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type Options struct {
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// Bind is the address:port used to bind the main interface with API.
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Bind string
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// AdminBind is the address:port or unix socket used to serve the admin
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// API.
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AdminBind string
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// ExternalURL keeps the URL used in communications (such as email,
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// ...), when it needs to use complete URL, not only relative parts.
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ExternalURL URL
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// BaseURL is the relative path where begins the root of the app.
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BaseURL string
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// DevProxy is the URL that override static assets.
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DevProxy string
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// DefaultNameServer is the NS server suggested by default.
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DefaultNameServer string
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// StorageEngine points to the storage engine used.
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StorageEngine storage.StorageEngine
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// NoAuth controls if there is user access control or not.
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NoAuth bool
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// ExternalAuth is the URL of the login form to use instead of the embedded one.
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ExternalAuth URL
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// JWTSecretKey stores the private key to sign and verify JWT tokens.
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JWTSecretKey JWTSecretKey
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}
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// BuildURL appends the given url to the absolute ExternalURL.
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func (o *Options) BuildURL(url string) string {
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return fmt.Sprintf("%s%s%s", o.ExternalURL, o.BaseURL, url)
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}
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// BuildURL_noescape build an URL containing formater.
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func (o *Options) BuildURL_noescape(url string, args ...interface{}) string {
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args = append([]interface{}{o.ExternalURL, o.BaseURL}, args...)
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return fmt.Sprintf("%s%s"+url, args...)
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}
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// ConsolidateConfig fills an Options struct by reading configuration from
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// config files, environment, then command line.
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//
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// Should be called only one time.
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func ConsolidateConfig() (opts *Options, err error) {
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u, _ := url.Parse("http://localhost:8081")
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// Define defaults options
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opts = &Options{
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Bind: ":8081",
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AdminBind: "./happydomain.sock",
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ExternalURL: URL{URL: u},
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BaseURL: "/",
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DefaultNameServer: "127.0.0.1:53",
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StorageEngine: storage.StorageEngine("leveldb"),
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}
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opts.declareFlags()
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// Establish a list of possible configuration file locations
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configLocations := []string{
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"happydomain.conf",
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}
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if home, err := os.UserConfigDir(); err == nil {
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configLocations = append(configLocations, path.Join(home, "happydomain", "happydomain.conf"))
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}
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configLocations = append(configLocations, path.Join("etc", "happydomain.conf"))
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// If config file exists, read configuration from it
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for _, filename := range configLocations {
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if _, e := os.Stat(filename); !os.IsNotExist(e) {
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log.Printf("Loading configuration from %s\n", filename)
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err = opts.parseFile(filename)
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if err != nil {
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return
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}
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break
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}
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}
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// Then, overwrite that by what is present in the environment
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err = opts.parseEnvironmentVariables()
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if err != nil {
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return
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}
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// Finaly, command line takes precedence
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err = opts.parseCLI()
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if err != nil {
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return
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}
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// Sanitize options
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if opts.BaseURL != "/" {
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opts.BaseURL = path.Clean(opts.BaseURL)
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} else {
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opts.BaseURL = ""
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}
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if opts.ExternalURL.URL.Host == "" || opts.ExternalURL.URL.Scheme == "" {
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u, err2 := url.Parse("http://" + opts.ExternalURL.URL.String())
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if err2 == nil {
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opts.ExternalURL.URL = u
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} else {
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err = fmt.Errorf("You defined an external URL without a scheme. The expected value is eg. http://localhost:8081")
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return
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}
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}
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if len(opts.ExternalURL.URL.Path) > 1 {
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if opts.BaseURL != "" && opts.BaseURL != opts.ExternalURL.URL.Path {
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err = fmt.Errorf("You defined both baseurl and a path to externalurl that are different. Define only one of those.")
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return
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}
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opts.BaseURL = path.Clean(opts.ExternalURL.URL.Path)
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}
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opts.ExternalURL.URL.Path = ""
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opts.ExternalURL.URL.Fragment = ""
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opts.ExternalURL.URL.RawQuery = ""
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if len(opts.JWTSecretKey) == 0 {
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opts.JWTSecretKey = make([]byte, 32)
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_, err = rand.Read(opts.JWTSecretKey)
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if err != nil {
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return
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}
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}
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return
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}
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// parseLine treats a config line and place the read value in the variable
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// declared to the corresponding flag.
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func (o *Options) parseLine(line string) (err error) {
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fields := strings.SplitN(line, "=", 2)
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orig_key := strings.TrimSpace(fields[0])
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value := strings.TrimSpace(fields[1])
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if len(value) == 0 {
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return
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}
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key := strings.TrimPrefix(strings.TrimPrefix(orig_key, "HAPPYDNS_"), "HAPPYDOMAIN_")
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key = strings.Replace(key, "_", "-", -1)
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key = strings.ToLower(key)
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err = flag.Set(key, value)
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return
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}
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