feat: add CORS support to the game server

Author: gitcommitankit

backend/go.mod

@@ -23,6 +23,7 @@ require (
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/klauspost/compress v1.15.9 // indirect
 	github.com/pierrec/lz4/v4 v4.1.15 // indirect
+	github.com/rs/cors v1.11.1 // indirect
 	golang.org/x/crypto v0.37.0 // indirect
 	golang.org/x/sync v0.13.0 // indirect
 	golang.org/x/text v0.24.0 // indirect

backend/go.sum

@@ -35,6 +35,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/redis/go-redis/v9 v9.17.2 h1:P2EGsA4qVIM3Pp+aPocCJ7DguDHhqrXNhVcEp4ViluI=
 github.com/redis/go-redis/v9 v9.17.2/go.mod h1:u410H11HMLoB+TP67dz8rL9s6QW2j76l0//kSOd3370=
+github.com/rs/cors v1.11.1 h1:eU3gRzXLRK57F5rKMGMZURNdIG4EoAmX8k94r9wXWHA=
+github.com/rs/cors v1.11.1/go.mod h1:XyqrcTp5zjWr1wsJ8PIRZssZ8b/WMcMf71DJnit4EMU=
 github.com/segmentio/kafka-go v0.4.49 h1:GJiNX1d/g+kG6ljyJEoi9++PUMdXGAxb7JGPiDCuNmk=
 github.com/segmentio/kafka-go v0.4.49/go.mod h1:Y1gn60kzLEEaW28YshXyk2+VCUKbJ3Qr6DrnT3i4+9E=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

backend/main.go

@@ -8,6 +8,8 @@ import (
 	"4-in-a-row/config"
 	"4-in-a-row/db"
 	"4-in-a-row/handlers"
+
+	"github.com/rs/cors"
 )
 
 func main() {
@@ -49,15 +51,33 @@ func main() {
 		}
 	}
 
-	http.HandleFunc("/", handlers.RootHandler)
-	http.HandleFunc("/health", handlers.HealthHandler)
-	http.HandleFunc("/ws", handlers.WSHandler)
-	http.HandleFunc("/leaderboard", handlers.LeaderboardHandler)
-	http.HandleFunc("/metrics", handlers.GameMetricsHandler)
-	http.HandleFunc("/recent-games", handlers.RecentGamesHandler)
+	mux := http.NewServeMux()
+	mux.HandleFunc("/", handlers.RootHandler)
+	mux.HandleFunc("/health", handlers.HealthHandler)
+	mux.HandleFunc("/ws", handlers.WSHandler)
+	mux.HandleFunc("/leaderboard", handlers.LeaderboardHandler)
+	mux.HandleFunc("/metrics", handlers.GameMetricsHandler)
+	mux.HandleFunc("/recent-games", handlers.RecentGamesHandler)
+
+	// CORS
+	c := cors.New(cors.Options{
+		AllowedOrigins: []string{"*"},
+		AllowedMethods: []string{
+			http.MethodGet,
+			http.MethodPost,
+			http.MethodPut,
+			http.MethodPatch,
+			http.MethodDelete,
+			http.MethodOptions,
+			http.MethodHead,
+		},
+		AllowedHeaders: []string{"*"},
+	})
+
+	handler := c.Handler(mux)
 
 	log.Printf("Server listening on :%s", cfg.Port)
-	if err := http.ListenAndServe(":"+cfg.Port, nil); err != nil {
+	if err := http.ListenAndServe(":"+cfg.Port, handler); err != nil {
 		log.Fatal("Server error: ", err)
 	}
 }