Implemented configuration file functionality

For site name, port number and data directory

config/config.go

@@ -0,0 +1,36 @@
+package config
+
+import (
+	"encoding/json"
+	"log"
+	"os"
+)
+
+type Config struct {
+	SiteName string `json:"site_name"`
+	Port     string `json:"port"`
+	DataDir  string `json:"data_dir"`
+}
+
+func Load(path string) Config {
+	configData := Config{
+		SiteName: "Unnamed Download Listing",
+		Port:     "8080",
+		DataDir:  "data",
+	}
+
+	file, err := os.Open(path)
+	if err != nil {
+		log.Println("No config file found, using defaults. Consider setting up a Site Name at the very least!")
+		return configData
+	}
+	defer file.Close()
+
+	// Overwrite the default configuration with data from 'file'
+	err = json.NewDecoder(file).Decode(&configData)
+	if err != nil {
+		log.Fatal("Config file exists but has errors:", err)
+	}
+
+	return configData
+}

main.go

@@ -6,13 +6,16 @@ import (
 	"net/http"
 	"os"
 
+	"192.168.1.180/odonax/filehost-athome/config"
 	"192.168.1.180/odonax/filehost-athome/database"
 )
 
 func main() {
-	os.MkdirAll("data/files", 0755)
+	cfg := config.Load("config.json")
 
-	db := database.Open("data/hub.db")
+	os.MkdirAll(cfg.DataDir+"/files", 0755)
+
+	db := database.Open(cfg.DataDir+"/hub.db")
 	defer db.Close()
 
 	tmpl, err := template.ParseFiles("templates/home.html")
@@ -22,7 +25,7 @@ func main() {
 
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		data := map[string]string{
-			"Name":        "Filehost at home",
+			"Name":        cfg.SiteName,
 			"Description": "This is where you'll own your files and share them freely.",
 		}
 		tmpl.Execute(w, data)