Add the XDG specification for configuration file location.

README.md

@@ -24,8 +24,8 @@ Or, in order to build the project you can run the command ``go build main.go``.
 It will generate a binary that you can run as any binary file.
 
 ### Configure
-Configure the gateway by editing the ``httpAuth.cfg`` file in order to give all XMPP and HTTP server informations.
-An example of the config file can be found in [the repos](https://git.kingpenguin.tk/chteufleur/HTTPAuthentificationOverXMPP/src/master/httpAuth.cfg).
+Configure the gateway by editing the ``httpAuth.conf`` file in order to give all XMPP and HTTP server informations. This configuration file has to be placed following the [XDG specification](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html).
+An example of the config file can be found in [the repos](https://git.kingpenguin.tk/chteufleur/HTTPAuthentificationOverXMPP/src/master/httpAuth.conf).
 
 XMPP
  * xmpp_server_address : Component server address connection (default: 127.0.0.1)

main.go

@@ -10,13 +10,16 @@ import (
 	"os"
 	"os/signal"
 	"strconv"
+	"strings"
 	"syscall"
 	"time"
 )
 
 const (
 	Version               = "v0.5-dev"
-	configurationFilePath = "httpAuth.cfg"
+	configurationFilePath = "httpAuth.conf"
+	PathConfEnvVariable   = "XDG_CONFIG_DIRS"
+	DefaultXdgConfigDirs  = "/etc/xdg"
 )
 
 var (
@@ -26,9 +29,8 @@ var (
 func init() {
 	log.Printf("Running HTTP-Auth %v", Version)
 
-	err := cfg.Load(configurationFilePath, mapConfig)
-	if err != nil {
-		log.Fatal("Failed to load configuration file.", err)
+	if !loadConfigFile() {
+		log.Fatal("Failed to load configuration file.")
 	}
 
 	// HTTP config
@@ -74,6 +76,28 @@ func init() {
 	xmpp.VerifyCertValidity = mapConfig["xmpp_verify_cert_validity"] != "false" // Default TRUE
 }
 
+func loadConfigFile() bool {
+	ret := false
+	envVariable := os.Getenv(PathConfEnvVariable)
+	if envVariable == "" {
+		envVariable = DefaultXdgConfigDirs
+	}
+	for _, path := range strings.Split(envVariable, ":") {
+		log.Println("Try to find configuration file into " + path)
+		configFile := path + "/" + configurationFilePath
+		if _, err := os.Stat(configFile); err == nil {
+			// The config file exist
+			if cfg.Load(configFile, mapConfig) == nil {
+				// And has been loaded succesfully
+				log.Println("Find configuration file at " + configFile)
+				ret = true
+				break
+			}
+		}
+	}
+	return ret
+}
+
 func main() {
 
 	go http.Run()