add cors

app.env

@@ -1,4 +1,5 @@
 ENVIRONMENT=development
+ALLOWED_ORIGINS=http://localhost:3000,https://simplebank.com
 DB_SOURCE=postgresql://root:secret@localhost:5432/simple_bank?sslmode=disable
 MIGRATION_URL=file://db/migration
 HTTP_SERVER_ADDRESS=0.0.0.0:8080

go.mod

@@ -57,6 +57,7 @@ require (
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/robfig/cron/v3 v3.0.1 // indirect
+	github.com/rs/cors v1.10.1 // indirect
 	github.com/spf13/afero v1.8.2 // indirect
 	github.com/spf13/cast v1.5.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect

go.sum

@@ -891,6 +891,8 @@ github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFR
 github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/rogpeppe/go-internal v1.8.0 h1:FCbCCtXNOY3UtUuHUYaghJg4y7Fd14rXifAYUAtL9R8=
 github.com/rogpeppe/go-internal v1.8.0/go.mod h1:WmiCO8CzOY8rg0OYDC4/i/2WRWAB6poM+XZ2dLUbcbE=
+github.com/rs/cors v1.10.1 h1:L0uuZVXIKlI1SShY2nhFfo44TYvDPQ1w4oFkUJNfhyo=
+github.com/rs/cors v1.10.1/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
 github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
 github.com/rs/xid v1.4.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
 github.com/rs/zerolog v1.13.0/go.mod h1:YbFCdg8HfsridGWAh22vktObvhZbQsZXe4/zB0OKkWU=

main.go

@@ -16,6 +16,7 @@ import (
 	"github.com/hibiken/asynq"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/rakyll/statik/fs"
+	"github.com/rs/cors"
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	"github.com/techschool/simplebank/api"
@@ -205,8 +206,27 @@ func runGatewayServer(
 	swaggerHandler := http.StripPrefix("/swagger/", http.FileServer(statikFS))
 	mux.Handle("/swagger/", swaggerHandler)
 
+	c := cors.New(cors.Options{
+		AllowedOrigins: config.AllowedOrigins,
+		AllowedMethods: []string{
+			http.MethodHead,
+			http.MethodOptions,
+			http.MethodGet,
+			http.MethodPost,
+			http.MethodPut,
+			http.MethodPatch,
+			http.MethodDelete,
+		},
+		AllowedHeaders: []string{
+			"Content-Type",
+			"Authorization",
+		},
+		AllowCredentials: true,
+	})
+	handler := c.Handler(gapi.HttpLogger(mux))
+
 	httpServer := &http.Server{
-		Handler: gapi.HttpLogger(mux),
+		Handler: handler,
 		Addr:    config.HTTPServerAddress,
 	}
 

util/config.go

@@ -10,6 +10,7 @@ import (
 // The values are read by viper from a config file or environment variable.
 type Config struct {
 	Environment          string        `mapstructure:"ENVIRONMENT"`
+	AllowedOrigins       []string      `mapstructure:"ALLOWED_ORIGINS"`
 	DBSource             string        `mapstructure:"DB_SOURCE"`
 	MigrationURL         string        `mapstructure:"MIGRATION_URL"`
 	RedisAddress         string        `mapstructure:"REDIS_ADDRESS"`