feat: config cors (#15)

.env.example

@@ -6,3 +6,5 @@ REDIS_PASSWORD=123456
 
 APP_PORT=3000
 APP_ENV=development
+
+CORS_ORIGINS=https://openhouse.chula.ac.th,https://isd-sgcu.in.th,https://openhouse.isd-sgcu.in.th

cfgldr/cfgldr.go

@@ -8,6 +8,7 @@ type Config struct {
 	DatabaseConfig DatabaseConfig
 	AppConfig      AppConfig
 	RedisConfig    RedisConfig
+	CorsConfig     CorsConfig
 }
 
 type DatabaseConfig struct {
@@ -25,6 +26,10 @@ type RedisConfig struct {
 	Password string `mapstructure:"PASSWORD"`
 }
 
+type CorsConfig struct {
+	AllowOrigins string `mapstructure:"ORIGINS"`
+}
+
 func LoadConfig() (*Config, error) {
 	dbCfgLdr := viper.New()
 	dbCfgLdr.SetEnvPrefix("DB")
@@ -53,10 +58,20 @@ func LoadConfig() (*Config, error) {
 		return nil, err
 	}
 
+	corsConfigLdr := viper.New()
+	corsConfigLdr.SetEnvPrefix("CORS")
+	corsConfigLdr.AutomaticEnv()
+	dbCfgLdr.AllowEmptyEnv(false)
+	corsConfig := CorsConfig{}
+	if err := corsConfigLdr.Unmarshal(&corsConfig); err != nil {
+		return nil, err
+	}
+
 	return &Config{
 		DatabaseConfig: dbConfig,
 		AppConfig:      appConfig,
 		RedisConfig:    redisConfig,
+		CorsConfig:     corsConfig,
 	}, nil
 }
 

cfgldr/cors.go

@@ -0,0 +1,40 @@
+package cfgldr
+
+import (
+	"strings"
+	"time"
+
+	"github.com/gin-contrib/cors"
+	"github.com/gin-gonic/gin"
+)
+
+type CorsHandler gin.HandlerFunc
+
+func makeCorsConfig(cfg *Config) gin.HandlerFunc {
+	if cfg.AppConfig.IsDevelopment() {
+		return cors.New(cors.Config{
+			AllowMethods:     []string{"*"},
+			AllowHeaders:     []string{"*"},
+			AllowCredentials: true,
+			MaxAge:           12 * time.Hour,
+			AllowOriginFunc: func(string) bool {
+				return true
+			},
+		})
+
+	}
+
+	allowOrigins := strings.Split(cfg.CorsConfig.AllowOrigins, ",")
+
+	return cors.New(cors.Config{
+		AllowOrigins:     allowOrigins,
+		AllowMethods:     []string{"*"},
+		AllowHeaders:     []string{"*"},
+		AllowCredentials: true,
+		MaxAge:           12 * time.Hour,
+	})
+}
+
+func MakeCorsConfig(cfg *Config) CorsHandler {
+	return CorsHandler(makeCorsConfig(cfg))
+}

cmd/main.go

@@ -20,6 +20,8 @@ func main() {
 	}
 	r := gin.Default()
 
+	r.Use(gin.HandlerFunc(container.CorsHandler))
+
 	r.GET("/_hc", container.HcHandler.HealthCheck)
 	r.GET("/live", container.FeatureflagHandler.GetLivestreamInfo)
 	r.GET("/events", container.EventHandler.GetAllEvents)

di/wire.go

@@ -21,22 +21,25 @@ type Container struct {
 	FeatureflagHandler featureflag.Handler
 	Config             *cfgldr.Config
 	Logger             *zap.Logger
+	CorsHandler        cfgldr.CorsHandler
 }
 
-func newContainer(eventHandler event.Handler, hcHandler healthcheck.Handler, featureflagHandler featureflag.Handler, config *cfgldr.Config, logger *zap.Logger) Container {
+func newContainer(eventHandler event.Handler, hcHandler healthcheck.Handler, featureflagHandler featureflag.Handler, config *cfgldr.Config, logger *zap.Logger, corsHandler cfgldr.CorsHandler) Container {
 	return Container{
 		eventHandler,
 		hcHandler,
 		featureflagHandler,
 		config,
 		logger,
+		corsHandler,
 	}
 }
 
 func Init() (Container, error) {
 	wire.Build(
 		newContainer,
 		cfgldr.LoadConfig,
+		cfgldr.MakeCorsConfig,
 		event.NewHandler,
 		event.NewService,
 		event.NewRepository,

go.mod

@@ -3,6 +3,7 @@ module github.com/isd-sgcu/oph66-backend
 go 1.21.5
 
 require (
+	github.com/gin-contrib/cors v1.5.0
 	github.com/gin-gonic/gin v1.9.1
 	github.com/google/wire v0.5.0
 	github.com/redis/go-redis/v9 v9.3.0

go.sum

@@ -27,6 +27,8 @@ github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nos
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
 github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
+github.com/gin-contrib/cors v1.5.0 h1:DgGKV7DDoOn36DFkNtbHrjoRiT5ExCe+PC9/xp7aKvk=
+github.com/gin-contrib/cors v1.5.0/go.mod h1:TvU7MAZ3EwrPLI2ztzTt3tqgvBCq+wn8WpZmfADjupI=
 github.com/gin-contrib/sse v0.1.0 h1:Y/yl/+YNO8GZSjAhjMsSuLt29uWRFHdHYUb5lYOV9qE=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
 github.com/gin-gonic/gin v1.9.1 h1:4idEAncQnU5cB7BeOkPtxjfCSye0AAm1R0RVIqJ+Jmg=