Move -redirect into the configuration file.

README

@@ -43,11 +43,13 @@ The server may be configured in the JSON file `data/config.json`.  This
 file may look as follows:
 
     {
+        "canonicalHost: "galene.example.org",
         "admin":[{"username":"root","password":"secret"}]
     }
 
 The fields are as follows:
 
+- `canonicalHost`: the canonical name of the host running the server;
 - `admin` defines the users allowed to look at the `/stats.html` file; it
   has the same syntax as user definitions in groups (see below).
 

galene.go

@@ -27,8 +27,6 @@ func main() {
 	flag.StringVar(&httpAddr, "http", ":8443", "web server `address`")
 	flag.StringVar(&webserver.StaticRoot, "static", "./static/",
 		"web server root `directory`")
-	flag.StringVar(&webserver.Redirect, "redirect", "",
-		"redirect to canonical `host`")
 	flag.BoolVar(&webserver.Insecure, "insecure", false,
 		"act as an HTTP server rather than HTTPS")
 	flag.StringVar(&group.DataDirectory, "data", "./data/",

group/group.go

@@ -809,7 +809,8 @@ type Configuration struct {
 	modTime  time.Time `json:"-"`
 	fileSize int64     `json:"-"`
 
-	Admin []ClientPattern `json:"admin"`
+	CanonicalHost string          `json:"canonicalHost"`
+	Admin         []ClientPattern `json:"admin"`
 }
 
 var configuration struct {

webserver/webserver.go

@@ -32,8 +32,6 @@ var server atomic.Value
 
 var StaticRoot string
 
-var Redirect string
-
 var Insecure bool
 
 func Serve(address string, dataDir string) error {
@@ -130,13 +128,14 @@ const (
 )
 
 func redirect(w http.ResponseWriter, r *http.Request) bool {
-	if Redirect == "" || strings.EqualFold(r.Host, Redirect) {
+	conf, err := group.GetConfiguration()
+	if err != nil || conf.CanonicalHost == "" {
 		return false
 	}
 
 	u := url.URL{
 		Scheme: "https",
-		Host:   Redirect,
+		Host:   conf.CanonicalHost,
 		Path:   r.URL.Path,
 	}
 	http.Redirect(w, r, u.String(), http.StatusMovedPermanently)