Json config

.gitignore

@@ -1 +1,2 @@
 /.idea/
+*.json

main.go

@@ -1,22 +1,26 @@
 package main
 
 import (
+	"encoding/json"
 	"fmt"
 	"log"
 	"net/http"
 	"net/http/httputil"
+	"os"
 	"strings"
 )
 
-const DOMAIN = "git.landgrafhomyak.ru"
+type config struct {
+	Listen        string   `json:"listen"`
+	Domain        string   `json:"domain"`
+	Organizations []string `json:"organizations"`
+}
 
-var ORGS_LIST = []string{"Multitasking", "LanguageUtilities", "xomrk"}
-
-func searcher(w http.ResponseWriter, r *http.Request) {
-	for _, org := range ORGS_LIST {
+func searcher(config *config, w http.ResponseWriter, r *http.Request) {
+	for _, org := range config.Organizations {
 		actualUrl := fmt.Sprintf(
 			"https://%s/api/packages/%s/maven/%s",
-			DOMAIN, org, strings.TrimLeft(r.URL.Path, "/"),
+			config.Domain, org, strings.TrimLeft(r.URL.Path, "/"),
 		)
 		resp, err := http.Head(actualUrl)
 		if err != nil {
@@ -59,7 +63,42 @@ func searcher(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(404)
 }
 
-func main() {
-	http.HandleFunc("/", searcher)
-	log.Fatal(http.ListenAndServe("localhost:49186", nil))
+func readConfig(path string) config {
+	file, err := os.Open(path)
+	if err != nil {
+		panic(err)
+	}
+
+	var data config
+	if err := json.NewDecoder(file).Decode(&data); err != nil {
+		panic(err)
+	}
+
+	if err := file.Close(); err != nil {
+		panic(err)
+	}
+
+	return data
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Missed path to config")
+		return
+	}
+	if len(os.Args) > 2 {
+		fmt.Println("Excess arguments")
+		return
+	}
+
+	config := readConfig(os.Args[1])
+	if config.Organizations == nil {
+		fmt.Println("Missed organizations list")
+		return
+	}
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		searcher(&config, w, r)
+	})
+	log.Fatal(http.ListenAndServe(config.Listen, nil))
 }