get forwarded url

go.mod

@@ -2,6 +2,7 @@ module github.com/sentriz/gonic
 
 require (
 	cloud.google.com/go v0.37.1 // indirect
+	github.com/davecgh/go-spew v1.1.1
 	github.com/denisenkom/go-mssqldb v0.0.0-20190315220205-a8ed825ac853 // indirect
 	github.com/dhowden/tag v0.0.0-20181104225729-a9f04c2798ca
 	github.com/erikstmartin/go-testdb v0.0.0-20160219214506-8d10e4a1bae5 // indirect

handler/admin.go

@@ -50,6 +50,9 @@ func (c *Controller) ServeHome(w http.ResponseWriter, r *http.Request) {
 	c.DB.Table("albums").Count(&data.AlbumCount)
 	c.DB.Table("tracks").Count(&data.TrackCount)
 	c.DB.Find(&data.AllUsers)
+	var apiKey db.Setting
+	c.DB.Where("key = ?", "lastfm_api_key").First(&apiKey)
+	data.CurrentLastFMAPIKey = apiKey.Value
 	renderTemplate(w, r, "home", &data)
 }
 

handler/handler.go

@@ -142,6 +142,21 @@ func respondError(w http.ResponseWriter, r *http.Request,
 	))
 }
 
+func firstExisting(or string, strings ...string) string {
+	current := ""
+	for _, s := range strings {
+		if s == "" {
+			continue
+		}
+		current = s
+		break
+	}
+	if current == "" {
+		return or
+	}
+	return current
+}
+
 func renderTemplate(w http.ResponseWriter, r *http.Request,
 	name string, data *templateData) {
 	session := r.Context().Value("session").(*sessions.Session)
@@ -154,11 +169,18 @@ func renderTemplate(w http.ResponseWriter, r *http.Request,
 	if ok {
 		data.User = user
 	}
-	if r.URL.Host == "" {
+	scheme := firstExisting(
-		data.RequestRoot = "http://localhost"
+		"http", // fallback
-	} else {
+		r.Header.Get("X-Forwarded-Proto"),
-		data.RequestRoot = fmt.Sprintf("%s://%s", r.URL.Scheme, r.URL.Host)
+		r.Header.Get("X-Forwarded-Scheme"),
-	}
+		r.URL.Scheme,
+	)
+	host := firstExisting(
+		"localhost:7373", // fallback
+		r.Header.Get("X-Forwarded-Host"),
+		r.Host,
+	)
+	data.RequestRoot = fmt.Sprintf("%s://%s", scheme, host)
 	err := templates[name].ExecuteTemplate(w, "layout", data)
 	if err != nil {
 		http.Error(w, fmt.Sprintf("500 when executing: %v", err), 500)