Add cors middleware

README.md

@@ -84,7 +84,7 @@ The name and related link can be provided as well.
 
 ```toml
 PORT = 4000
-PAGE_URL = "http://localhost:4000"
+ALLOWED_HOSTS = "*"
 TITLE = "GoDash"
 
 LOG_LEVEL = "info"
@@ -115,7 +115,8 @@ services:
       - PUID=1000
       - PGID=1000
       - TZ=Europe/Berlin
-      - PAGE_URL=https://home.example.com
+      # allowed hosts for cors, seperated by comma
+      - ALLOWED_HOSTS=https://home.example.com,https://another.example.com
       # change title to something else
       - TITLE=GoDash
       # available log-levels: debug,info,warn,error,panic,fatal

main.go

@@ -13,7 +13,6 @@ import (
 	"godash/weather"
 	"html/template"
 	"net/http"
-	"net/url"
 	"os"
 	"os/signal"
 	"time"
@@ -34,11 +33,11 @@ type info struct {
 }
 
 type config struct {
-	Title      string  `env:"TITLE" envDefault:"goDash"`
-	Port       int     `env:"PORT" envDefault:"4000"`
-	PageUrl    url.URL `env:"PAGE_URL" envDefault:"http://localhost:4000"`
-	LogLevel   string  `env:"LOG_LEVEL" envDefault:"info"`
-	LiveSystem bool    `env:"LIVE_SYSTEM" envDefault:"true"`
+	Title        string   `env:"TITLE" envDefault:"goDash"`
+	Port         int      `env:"PORT" envDefault:"4000"`
+	AllowedHosts []string `env:"ALLOWED_HOSTS" envDefault:"*" envSeparator:","`
+	LogLevel     string   `env:"LOG_LEVEL" envDefault:"info"`
+	LiveSystem   bool     `env:"LIVE_SYSTEM" envDefault:"true"`
 }
 
 func (g *goDash) createInfoServices() {
@@ -50,6 +49,17 @@ func (g *goDash) createInfoServices() {
 	}
 }
 
+func (g *goDash) setupMiddlewares() {
+	g.router.Use(middleware.Recover())
+	g.router.Use(middleware.GzipWithConfig(middleware.GzipConfig{Level: 5}))
+	g.router.Pre(middleware.RemoveTrailingSlash())
+	g.router.Use(middleware.CORSWithConfig(middleware.CORSConfig{
+		AllowOrigins: g.config.AllowedHosts,
+		AllowHeaders: []string{echo.HeaderOrigin, echo.HeaderContentType, echo.HeaderAccept},
+		AllowMethods: []string{echo.GET},
+	}))
+}
+
 func main() {
 	g := goDash{router: echo.New()}
 	g.router.Renderer = &TemplateRenderer{
@@ -64,11 +74,7 @@ func main() {
 		_ = logger.Sync()
 	}(g.logger)
 	g.setupEchoLogging()
-
-	g.router.Use(middleware.Recover())
-	g.router.Use(middleware.GzipWithConfig(middleware.GzipConfig{Level: 5}))
-	g.router.Pre(middleware.RemoveTrailingSlash())
-
+	g.setupMiddlewares()
 	g.createInfoServices()
 	g.router.GET("/", g.index)
 	g.router.GET("/ws", g.ws)